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420a0d19 CE |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
2ea97746 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
420a0d19 CE |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | #include "../exim.h" | |
9 | #include "smtp.h" | |
10 | ||
420a0d19 CE |
11 | |
12 | /* Options specific to the smtp transport. This transport also supports LMTP | |
13 | over TCP/IP. The options must be in alphabetic order (note that "_" comes | |
14 | before the lower case letters). Some live in the transport_instance block so as | |
15 | to be publicly visible; these are flagged with opt_public. */ | |
16 | ||
17 | optionlist smtp_transport_options[] = { | |
2ea97746 CE |
18 | { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public, |
19 | (void *)offsetof(transport_instance, expand_multi_domain) }, | |
20 | { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden, | |
21 | (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) }, | |
22 | ||
420a0d19 CE |
23 | { "address_retry_include_sender", opt_bool, |
24 | (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) }, | |
25 | { "allow_localhost", opt_bool, | |
26 | (void *)offsetof(smtp_transport_options_block, allow_localhost) }, | |
2ea97746 CE |
27 | #ifdef EXPERIMENTAL_ARC |
28 | { "arc_sign", opt_stringptr, | |
29 | (void *)offsetof(smtp_transport_options_block, arc_sign) }, | |
30 | #endif | |
420a0d19 CE |
31 | { "authenticated_sender", opt_stringptr, |
32 | (void *)offsetof(smtp_transport_options_block, authenticated_sender) }, | |
33 | { "authenticated_sender_force", opt_bool, | |
34 | (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) }, | |
35 | { "command_timeout", opt_time, | |
36 | (void *)offsetof(smtp_transport_options_block, command_timeout) }, | |
37 | { "connect_timeout", opt_time, | |
38 | (void *)offsetof(smtp_transport_options_block, connect_timeout) }, | |
39 | { "connection_max_messages", opt_int | opt_public, | |
40 | (void *)offsetof(transport_instance, connection_max_messages) }, | |
2ea97746 CE |
41 | # ifdef SUPPORT_DANE |
42 | { "dane_require_tls_ciphers", opt_stringptr, | |
43 | (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) }, | |
44 | # endif | |
420a0d19 CE |
45 | { "data_timeout", opt_time, |
46 | (void *)offsetof(smtp_transport_options_block, data_timeout) }, | |
47 | { "delay_after_cutoff", opt_bool, | |
48 | (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) }, | |
49 | #ifndef DISABLE_DKIM | |
50 | { "dkim_canon", opt_stringptr, | |
2ea97746 | 51 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) }, |
420a0d19 | 52 | { "dkim_domain", opt_stringptr, |
2ea97746 CE |
53 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) }, |
54 | { "dkim_hash", opt_stringptr, | |
55 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) }, | |
56 | { "dkim_identity", opt_stringptr, | |
57 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) }, | |
420a0d19 | 58 | { "dkim_private_key", opt_stringptr, |
2ea97746 | 59 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) }, |
420a0d19 | 60 | { "dkim_selector", opt_stringptr, |
2ea97746 | 61 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) }, |
420a0d19 | 62 | { "dkim_sign_headers", opt_stringptr, |
2ea97746 | 63 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) }, |
420a0d19 | 64 | { "dkim_strict", opt_stringptr, |
2ea97746 CE |
65 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) }, |
66 | { "dkim_timestamps", opt_stringptr, | |
67 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) }, | |
420a0d19 CE |
68 | #endif |
69 | { "dns_qualify_single", opt_bool, | |
70 | (void *)offsetof(smtp_transport_options_block, dns_qualify_single) }, | |
71 | { "dns_search_parents", opt_bool, | |
72 | (void *)offsetof(smtp_transport_options_block, dns_search_parents) }, | |
73 | { "dnssec_request_domains", opt_stringptr, | |
2ea97746 | 74 | (void *)offsetof(smtp_transport_options_block, dnssec.request) }, |
420a0d19 | 75 | { "dnssec_require_domains", opt_stringptr, |
2ea97746 | 76 | (void *)offsetof(smtp_transport_options_block, dnssec.require) }, |
420a0d19 CE |
77 | { "dscp", opt_stringptr, |
78 | (void *)offsetof(smtp_transport_options_block, dscp) }, | |
79 | { "fallback_hosts", opt_stringptr, | |
80 | (void *)offsetof(smtp_transport_options_block, fallback_hosts) }, | |
81 | { "final_timeout", opt_time, | |
82 | (void *)offsetof(smtp_transport_options_block, final_timeout) }, | |
83 | { "gethostbyname", opt_bool, | |
84 | (void *)offsetof(smtp_transport_options_block, gethostbyname) }, | |
420a0d19 CE |
85 | { "helo_data", opt_stringptr, |
86 | (void *)offsetof(smtp_transport_options_block, helo_data) }, | |
87 | { "hosts", opt_stringptr, | |
88 | (void *)offsetof(smtp_transport_options_block, hosts) }, | |
89 | { "hosts_avoid_esmtp", opt_stringptr, | |
90 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) }, | |
91 | { "hosts_avoid_pipelining", opt_stringptr, | |
92 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) }, | |
93 | #ifdef SUPPORT_TLS | |
94 | { "hosts_avoid_tls", opt_stringptr, | |
95 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) }, | |
96 | #endif | |
97 | { "hosts_max_try", opt_int, | |
98 | (void *)offsetof(smtp_transport_options_block, hosts_max_try) }, | |
99 | { "hosts_max_try_hardlimit", opt_int, | |
100 | (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) }, | |
101 | #ifdef SUPPORT_TLS | |
102 | { "hosts_nopass_tls", opt_stringptr, | |
103 | (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) }, | |
2ea97746 CE |
104 | { "hosts_noproxy_tls", opt_stringptr, |
105 | (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) }, | |
420a0d19 CE |
106 | #endif |
107 | { "hosts_override", opt_bool, | |
108 | (void *)offsetof(smtp_transport_options_block, hosts_override) }, | |
2ea97746 CE |
109 | #ifdef EXPERIMENTAL_PIPE_CONNECT |
110 | { "hosts_pipe_connect", opt_stringptr, | |
111 | (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) }, | |
112 | #endif | |
420a0d19 CE |
113 | { "hosts_randomize", opt_bool, |
114 | (void *)offsetof(smtp_transport_options_block, hosts_randomize) }, | |
115 | #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP) | |
116 | { "hosts_request_ocsp", opt_stringptr, | |
117 | (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) }, | |
118 | #endif | |
119 | { "hosts_require_auth", opt_stringptr, | |
120 | (void *)offsetof(smtp_transport_options_block, hosts_require_auth) }, | |
121 | #ifdef SUPPORT_TLS | |
2ea97746 CE |
122 | # ifdef SUPPORT_DANE |
123 | { "hosts_require_dane", opt_stringptr, | |
124 | (void *)offsetof(smtp_transport_options_block, hosts_require_dane) }, | |
125 | # endif | |
420a0d19 CE |
126 | # ifndef DISABLE_OCSP |
127 | { "hosts_require_ocsp", opt_stringptr, | |
128 | (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) }, | |
129 | # endif | |
130 | { "hosts_require_tls", opt_stringptr, | |
131 | (void *)offsetof(smtp_transport_options_block, hosts_require_tls) }, | |
132 | #endif | |
133 | { "hosts_try_auth", opt_stringptr, | |
134 | (void *)offsetof(smtp_transport_options_block, hosts_try_auth) }, | |
2ea97746 CE |
135 | { "hosts_try_chunking", opt_stringptr, |
136 | (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) }, | |
137 | #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE) | |
138 | { "hosts_try_dane", opt_stringptr, | |
139 | (void *)offsetof(smtp_transport_options_block, hosts_try_dane) }, | |
140 | #endif | |
141 | { "hosts_try_fastopen", opt_stringptr, | |
142 | (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) }, | |
420a0d19 CE |
143 | #ifndef DISABLE_PRDR |
144 | { "hosts_try_prdr", opt_stringptr, | |
145 | (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) }, | |
146 | #endif | |
147 | #ifdef SUPPORT_TLS | |
148 | { "hosts_verify_avoid_tls", opt_stringptr, | |
149 | (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) }, | |
150 | #endif | |
151 | { "interface", opt_stringptr, | |
152 | (void *)offsetof(smtp_transport_options_block, interface) }, | |
153 | { "keepalive", opt_bool, | |
154 | (void *)offsetof(smtp_transport_options_block, keepalive) }, | |
155 | { "lmtp_ignore_quota", opt_bool, | |
156 | (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) }, | |
157 | { "max_rcpt", opt_int | opt_public, | |
158 | (void *)offsetof(transport_instance, max_addresses) }, | |
2ea97746 | 159 | { "multi_domain", opt_expand_bool | opt_public, |
420a0d19 CE |
160 | (void *)offsetof(transport_instance, multi_domain) }, |
161 | { "port", opt_stringptr, | |
162 | (void *)offsetof(smtp_transport_options_block, port) }, | |
163 | { "protocol", opt_stringptr, | |
164 | (void *)offsetof(smtp_transport_options_block, protocol) }, | |
2ea97746 | 165 | { "retry_include_ip_address", opt_expand_bool, |
420a0d19 CE |
166 | (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) }, |
167 | { "serialize_hosts", opt_stringptr, | |
168 | (void *)offsetof(smtp_transport_options_block, serialize_hosts) }, | |
169 | { "size_addition", opt_int, | |
2ea97746 CE |
170 | (void *)offsetof(smtp_transport_options_block, size_addition) }, |
171 | #ifdef SUPPORT_SOCKS | |
172 | { "socks_proxy", opt_stringptr, | |
173 | (void *)offsetof(smtp_transport_options_block, socks_proxy) }, | |
174 | #endif | |
420a0d19 | 175 | #ifdef SUPPORT_TLS |
2ea97746 | 176 | { "tls_certificate", opt_stringptr, |
420a0d19 CE |
177 | (void *)offsetof(smtp_transport_options_block, tls_certificate) }, |
178 | { "tls_crl", opt_stringptr, | |
179 | (void *)offsetof(smtp_transport_options_block, tls_crl) }, | |
180 | { "tls_dh_min_bits", opt_int, | |
181 | (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) }, | |
182 | { "tls_privatekey", opt_stringptr, | |
183 | (void *)offsetof(smtp_transport_options_block, tls_privatekey) }, | |
184 | { "tls_require_ciphers", opt_stringptr, | |
185 | (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) }, | |
186 | { "tls_sni", opt_stringptr, | |
187 | (void *)offsetof(smtp_transport_options_block, tls_sni) }, | |
188 | { "tls_tempfail_tryclear", opt_bool, | |
189 | (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) }, | |
190 | { "tls_try_verify_hosts", opt_stringptr, | |
191 | (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) }, | |
420a0d19 CE |
192 | { "tls_verify_cert_hostnames", opt_stringptr, |
193 | (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)}, | |
420a0d19 CE |
194 | { "tls_verify_certificates", opt_stringptr, |
195 | (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }, | |
196 | { "tls_verify_hosts", opt_stringptr, | |
2ea97746 | 197 | (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }, |
420a0d19 | 198 | #endif |
2ea97746 CE |
199 | #ifdef SUPPORT_I18N |
200 | { "utf8_downconvert", opt_stringptr, | |
201 | (void *)offsetof(smtp_transport_options_block, utf8_downconvert) }, | |
420a0d19 CE |
202 | #endif |
203 | }; | |
204 | ||
205 | /* Size of the options list. An extern variable has to be used so that its | |
206 | address can appear in the tables drtables.c. */ | |
207 | ||
2ea97746 CE |
208 | int smtp_transport_options_count = nelem(smtp_transport_options); |
209 | ||
210 | ||
211 | #ifdef MACRO_PREDEF | |
212 | ||
213 | /* Dummy values */ | |
214 | smtp_transport_options_block smtp_transport_option_defaults = {0}; | |
215 | void smtp_transport_init(transport_instance *tblock) {} | |
216 | BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;} | |
217 | void smtp_transport_closedown(transport_instance *tblock) {} | |
218 | ||
219 | #else /*!MACRO_PREDEF*/ | |
220 | ||
420a0d19 CE |
221 | |
222 | /* Default private options block for the smtp transport. */ | |
223 | ||
224 | smtp_transport_options_block smtp_transport_option_defaults = { | |
2ea97746 CE |
225 | .hosts = NULL, |
226 | .fallback_hosts = NULL, | |
227 | .hostlist = NULL, | |
228 | .fallback_hostlist = NULL, | |
229 | .helo_data = US"$primary_hostname", | |
230 | .interface = NULL, | |
231 | .port = NULL, | |
232 | .protocol = US"smtp", | |
233 | .dscp = NULL, | |
234 | .serialize_hosts = NULL, | |
235 | .hosts_try_auth = NULL, | |
236 | .hosts_require_auth = NULL, | |
237 | .hosts_try_chunking = US"*", | |
238 | #ifdef SUPPORT_DANE | |
239 | .hosts_try_dane = NULL, | |
240 | .hosts_require_dane = NULL, | |
241 | .dane_require_tls_ciphers = NULL, | |
242 | #endif | |
243 | .hosts_try_fastopen = NULL, | |
420a0d19 | 244 | #ifndef DISABLE_PRDR |
2ea97746 | 245 | .hosts_try_prdr = US"*", |
420a0d19 CE |
246 | #endif |
247 | #ifndef DISABLE_OCSP | |
2ea97746 CE |
248 | .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */ |
249 | .hosts_require_ocsp = NULL, | |
250 | #endif | |
251 | .hosts_require_tls = NULL, | |
252 | .hosts_avoid_tls = NULL, | |
253 | .hosts_verify_avoid_tls = NULL, | |
254 | .hosts_avoid_pipelining = NULL, | |
255 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
256 | .hosts_pipe_connect = NULL, | |
257 | #endif | |
258 | .hosts_avoid_esmtp = NULL, | |
420a0d19 | 259 | #ifdef SUPPORT_TLS |
2ea97746 CE |
260 | .hosts_nopass_tls = NULL, |
261 | .hosts_noproxy_tls = US"*", | |
420a0d19 | 262 | #endif |
2ea97746 CE |
263 | .command_timeout = 5*60, |
264 | .connect_timeout = 5*60, | |
265 | .data_timeout = 5*60, | |
266 | .final_timeout = 10*60, | |
267 | .size_addition = 1024, | |
268 | .hosts_max_try = 5, | |
269 | .hosts_max_try_hardlimit = 50, | |
270 | .address_retry_include_sender = TRUE, | |
271 | .allow_localhost = FALSE, | |
272 | .authenticated_sender_force = FALSE, | |
273 | .gethostbyname = FALSE, | |
274 | .dns_qualify_single = TRUE, | |
275 | .dns_search_parents = FALSE, | |
276 | .dnssec = { .request=NULL, .require=NULL }, | |
277 | .delay_after_cutoff = TRUE, | |
278 | .hosts_override = FALSE, | |
279 | .hosts_randomize = FALSE, | |
280 | .keepalive = TRUE, | |
281 | .lmtp_ignore_quota = FALSE, | |
282 | .expand_retry_include_ip_address = NULL, | |
283 | .retry_include_ip_address = TRUE, | |
284 | #ifdef SUPPORT_SOCKS | |
285 | .socks_proxy = NULL, | |
286 | #endif | |
287 | #ifdef SUPPORT_TLS | |
288 | .tls_certificate = NULL, | |
289 | .tls_crl = NULL, | |
290 | .tls_privatekey = NULL, | |
291 | .tls_require_ciphers = NULL, | |
292 | .tls_sni = NULL, | |
293 | .tls_verify_certificates = US"system", | |
294 | .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS, | |
295 | .tls_tempfail_tryclear = TRUE, | |
296 | .tls_verify_hosts = NULL, | |
297 | .tls_try_verify_hosts = US"*", | |
298 | .tls_verify_cert_hostnames = US"*", | |
299 | #endif | |
300 | #ifdef SUPPORT_I18N | |
301 | .utf8_downconvert = NULL, | |
420a0d19 | 302 | #endif |
2ea97746 CE |
303 | #ifndef DISABLE_DKIM |
304 | .dkim = | |
305 | {.dkim_domain = NULL, | |
306 | .dkim_identity = NULL, | |
307 | .dkim_private_key = NULL, | |
308 | .dkim_selector = NULL, | |
309 | .dkim_canon = NULL, | |
310 | .dkim_sign_headers = NULL, | |
311 | .dkim_strict = NULL, | |
312 | .dkim_hash = US"sha256", | |
313 | .dkim_timestamps = NULL, | |
314 | .dot_stuffed = FALSE, | |
315 | .force_bodyhash = FALSE, | |
316 | # ifdef EXPERIMENTAL_ARC | |
317 | .arc_signspec = NULL, | |
318 | # endif | |
319 | }, | |
320 | # ifdef EXPERIMENTAL_ARC | |
321 | .arc_sign = NULL, | |
322 | # endif | |
420a0d19 CE |
323 | #endif |
324 | }; | |
325 | ||
420a0d19 CE |
326 | /* some DSN flags for use later */ |
327 | ||
328 | static int rf_list[] = {rf_notify_never, rf_notify_success, | |
329 | rf_notify_failure, rf_notify_delay }; | |
330 | ||
2ea97746 | 331 | static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" }; |
420a0d19 CE |
332 | |
333 | ||
334 | ||
335 | /* Local statics */ | |
336 | ||
2ea97746 CE |
337 | static uschar *smtp_command; /* Points to last cmd for error messages */ |
338 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ | |
339 | static uschar *data_command = US""; /* Points to DATA cmd for error messages */ | |
340 | static BOOL update_waiting; /* TRUE to update the "wait" database */ | |
341 | ||
342 | /*XXX move to smtp_context */ | |
343 | static BOOL pipelining_active; /* current transaction is in pipe mode */ | |
344 | ||
345 | ||
346 | static unsigned ehlo_response(uschar * buf, unsigned checks); | |
420a0d19 CE |
347 | |
348 | ||
349 | /************************************************* | |
350 | * Setup entry point * | |
351 | *************************************************/ | |
352 | ||
353 | /* This function is called when the transport is about to be used, | |
354 | but before running it in a sub-process. It is used for two things: | |
355 | ||
356 | (1) To set the fallback host list in addresses, when delivering. | |
357 | (2) To pass back the interface, port, protocol, and other options, for use | |
358 | during callout verification. | |
359 | ||
360 | Arguments: | |
361 | tblock pointer to the transport instance block | |
362 | addrlist list of addresses about to be transported | |
363 | tf if not NULL, pointer to block in which to return options | |
364 | uid the uid that will be set (not used) | |
365 | gid the gid that will be set (not used) | |
366 | errmsg place for error message (not used) | |
367 | ||
368 | Returns: OK always (FAIL, DEFER not used) | |
369 | */ | |
370 | ||
371 | static int | |
372 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, | |
373 | transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg) | |
374 | { | |
2ea97746 | 375 | smtp_transport_options_block *ob = SOB tblock->options_block; |
420a0d19 CE |
376 | |
377 | errmsg = errmsg; /* Keep picky compilers happy */ | |
378 | uid = uid; | |
379 | gid = gid; | |
380 | ||
381 | /* Pass back options if required. This interface is getting very messy. */ | |
382 | ||
2ea97746 | 383 | if (tf) |
420a0d19 CE |
384 | { |
385 | tf->interface = ob->interface; | |
386 | tf->port = ob->port; | |
387 | tf->protocol = ob->protocol; | |
388 | tf->hosts = ob->hosts; | |
389 | tf->hosts_override = ob->hosts_override; | |
390 | tf->hosts_randomize = ob->hosts_randomize; | |
391 | tf->gethostbyname = ob->gethostbyname; | |
392 | tf->qualify_single = ob->dns_qualify_single; | |
393 | tf->search_parents = ob->dns_search_parents; | |
394 | tf->helo_data = ob->helo_data; | |
395 | } | |
396 | ||
397 | /* Set the fallback host list for all the addresses that don't have fallback | |
398 | host lists, provided that the local host wasn't present in the original host | |
399 | list. */ | |
400 | ||
401 | if (!testflag(addrlist, af_local_host_removed)) | |
2ea97746 CE |
402 | for (; addrlist; addrlist = addrlist->next) |
403 | if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist; | |
420a0d19 CE |
404 | |
405 | return OK; | |
406 | } | |
407 | ||
408 | ||
409 | ||
410 | /************************************************* | |
411 | * Initialization entry point * | |
412 | *************************************************/ | |
413 | ||
414 | /* Called for each instance, after its options have been read, to | |
415 | enable consistency checks to be done, or anything else that needs | |
416 | to be set up. | |
417 | ||
418 | Argument: pointer to the transport instance block | |
419 | Returns: nothing | |
420 | */ | |
421 | ||
422 | void | |
423 | smtp_transport_init(transport_instance *tblock) | |
424 | { | |
2ea97746 | 425 | smtp_transport_options_block *ob = SOB tblock->options_block; |
420a0d19 CE |
426 | |
427 | /* Retry_use_local_part defaults FALSE if unset */ | |
428 | ||
429 | if (tblock->retry_use_local_part == TRUE_UNSET) | |
430 | tblock->retry_use_local_part = FALSE; | |
431 | ||
432 | /* Set the default port according to the protocol */ | |
433 | ||
2ea97746 CE |
434 | if (!ob->port) |
435 | ob->port = strcmpic(ob->protocol, US"lmtp") == 0 | |
436 | ? US"lmtp" | |
437 | : strcmpic(ob->protocol, US"smtps") == 0 | |
438 | ? US"smtps" : US"smtp"; | |
420a0d19 CE |
439 | |
440 | /* Set up the setup entry point, to be called before subprocesses for this | |
441 | transport. */ | |
442 | ||
443 | tblock->setup = smtp_transport_setup; | |
444 | ||
445 | /* Complain if any of the timeouts are zero. */ | |
446 | ||
447 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || | |
448 | ob->final_timeout <= 0) | |
449 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
450 | "command, data, or final timeout value is zero for %s transport", | |
451 | tblock->name); | |
452 | ||
453 | /* If hosts_override is set and there are local hosts, set the global | |
454 | flag that stops verify from showing router hosts. */ | |
455 | ||
456 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; | |
457 | ||
458 | /* If there are any fallback hosts listed, build a chain of host items | |
459 | for them, but do not do any lookups at this time. */ | |
460 | ||
461 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); | |
420a0d19 CE |
462 | } |
463 | ||
464 | ||
465 | ||
466 | ||
467 | ||
468 | /************************************************* | |
469 | * Set delivery info into all active addresses * | |
470 | *************************************************/ | |
471 | ||
472 | /* Only addresses whose status is >= PENDING are relevant. A lesser | |
473 | status means that an address is not currently being processed. | |
474 | ||
475 | Arguments: | |
476 | addrlist points to a chain of addresses | |
477 | errno_value to put in each address's errno field | |
478 | msg to put in each address's message field | |
479 | rc to put in each address's transport_return field | |
480 | pass_message if TRUE, set the "pass message" flag in the address | |
2ea97746 CE |
481 | host if set, mark addrs as having used this host |
482 | smtp_greeting from peer | |
483 | helo_response from peer | |
420a0d19 CE |
484 | |
485 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in | |
486 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate | |
487 | this particular type of timeout. | |
488 | ||
489 | Returns: nothing | |
490 | */ | |
491 | ||
492 | static void | |
493 | set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc, | |
2ea97746 CE |
494 | BOOL pass_message, host_item * host |
495 | #ifdef EXPERIMENTAL_DSN_INFO | |
496 | , const uschar * smtp_greeting, const uschar * helo_response | |
497 | #endif | |
498 | ) | |
420a0d19 CE |
499 | { |
500 | address_item *addr; | |
501 | int orvalue = 0; | |
502 | if (errno_value == ERRNO_CONNECTTIMEOUT) | |
503 | { | |
504 | errno_value = ETIMEDOUT; | |
505 | orvalue = RTEF_CTOUT; | |
506 | } | |
2ea97746 CE |
507 | for (addr = addrlist; addr; addr = addr->next) |
508 | if (addr->transport_return >= PENDING) | |
420a0d19 | 509 | { |
2ea97746 CE |
510 | addr->basic_errno = errno_value; |
511 | addr->more_errno |= orvalue; | |
512 | if (msg) | |
513 | { | |
514 | addr->message = msg; | |
515 | if (pass_message) setflag(addr, af_pass_message); | |
516 | } | |
517 | addr->transport_return = rc; | |
518 | if (host) | |
519 | { | |
520 | addr->host_used = host; | |
521 | #ifdef EXPERIMENTAL_DSN_INFO | |
522 | if (smtp_greeting) | |
523 | {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';} | |
524 | addr->smtp_greeting = smtp_greeting; | |
525 | ||
526 | if (helo_response) | |
527 | {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';} | |
528 | addr->helo_response = helo_response; | |
529 | #endif | |
530 | } | |
420a0d19 | 531 | } |
420a0d19 CE |
532 | } |
533 | ||
2ea97746 CE |
534 | static void |
535 | set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc, | |
536 | BOOL pass_message) | |
537 | { | |
538 | set_errno(addrlist, errno_value, msg, rc, pass_message, NULL | |
539 | #ifdef EXPERIMENTAL_DSN_INFO | |
540 | , NULL, NULL | |
541 | #endif | |
542 | ); | |
543 | } | |
420a0d19 CE |
544 | |
545 | ||
546 | /************************************************* | |
547 | * Check an SMTP response * | |
548 | *************************************************/ | |
549 | ||
550 | /* This function is given an errno code and the SMTP response buffer | |
551 | to analyse, together with the host identification for generating messages. It | |
552 | sets an appropriate message and puts the first digit of the response code into | |
553 | the yield variable. If no response was actually read, a suitable digit is | |
554 | chosen. | |
555 | ||
556 | Arguments: | |
557 | host the current host, to get its name for messages | |
558 | errno_value pointer to the errno value | |
559 | more_errno from the top address for use with ERRNO_FILTER_FAIL | |
560 | buffer the SMTP response buffer | |
561 | yield where to put a one-digit SMTP response code | |
2ea97746 | 562 | message where to put an error message |
420a0d19 CE |
563 | pass_message set TRUE if message is an SMTP response |
564 | ||
565 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE | |
566 | */ | |
567 | ||
2ea97746 CE |
568 | static BOOL |
569 | check_response(host_item *host, int *errno_value, int more_errno, | |
420a0d19 CE |
570 | uschar *buffer, int *yield, uschar **message, BOOL *pass_message) |
571 | { | |
2ea97746 CE |
572 | uschar * pl = pipelining_active ? US"pipelined " : US""; |
573 | const uschar * s; | |
420a0d19 CE |
574 | |
575 | *yield = '4'; /* Default setting is to give a temporary error */ | |
576 | ||
2ea97746 | 577 | switch(*errno_value) |
420a0d19 | 578 | { |
2ea97746 CE |
579 | case ETIMEDOUT: /* Handle response timeout */ |
580 | *message = US string_sprintf("SMTP timeout after %s%s", | |
581 | pl, smtp_command); | |
582 | if (transport_count > 0) | |
583 | *message = US string_sprintf("%s (%d bytes written)", *message, | |
584 | transport_count); | |
585 | return FALSE; | |
586 | ||
587 | case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */ | |
588 | s = string_printing(buffer); | |
589 | while (isspace(*s)) s++; | |
590 | *message = *s == 0 | |
591 | ? string_sprintf("Malformed SMTP reply (an empty line) " | |
592 | "in response to %s%s", pl, smtp_command) | |
593 | : string_sprintf("Malformed SMTP reply in response to %s%s: %s", | |
594 | pl, smtp_command, s); | |
595 | return FALSE; | |
596 | ||
597 | case ERRNO_FILTER_FAIL: /* Handle a failed filter process error; | |
598 | can't send QUIT as we mustn't end the DATA. */ | |
599 | *message = string_sprintf("transport filter process failed (%d)%s", | |
600 | more_errno, | |
601 | more_errno == EX_EXECFAILED ? ": unable to execute command" : ""); | |
602 | return FALSE; | |
603 | ||
604 | case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion; | |
605 | can't send QUIT as we mustn't end the DATA. */ | |
606 | *message = | |
607 | string_sprintf("failed to expand headers_add or headers_remove: %s", | |
608 | expand_string_message); | |
609 | return FALSE; | |
610 | ||
611 | case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */ | |
612 | *message = string_sprintf("failed to write a data block"); | |
613 | return FALSE; | |
614 | ||
615 | #ifdef SUPPORT_I18N | |
616 | case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */ | |
617 | *message = US"utf8 support required but not offered for forwarding"; | |
618 | DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message); | |
619 | return TRUE; | |
620 | #endif | |
420a0d19 CE |
621 | } |
622 | ||
623 | /* Handle error responses from the remote mailer. */ | |
624 | ||
625 | if (buffer[0] != 0) | |
626 | { | |
2ea97746 CE |
627 | *message = string_sprintf("SMTP error from remote mail server after %s%s: " |
628 | "%s", pl, smtp_command, s = string_printing(buffer)); | |
420a0d19 CE |
629 | *pass_message = TRUE; |
630 | *yield = buffer[0]; | |
631 | return TRUE; | |
632 | } | |
633 | ||
634 | /* No data was read. If there is no errno, this must be the EOF (i.e. | |
635 | connection closed) case, which causes deferral. An explicit connection reset | |
636 | error has the same effect. Otherwise, put the host's identity in the message, | |
637 | leaving the errno value to be interpreted as well. In all cases, we have to | |
638 | assume the connection is now dead. */ | |
639 | ||
640 | if (*errno_value == 0 || *errno_value == ECONNRESET) | |
641 | { | |
642 | *errno_value = ERRNO_SMTPCLOSED; | |
2ea97746 CE |
643 | *message = US string_sprintf("Remote host closed connection " |
644 | "in response to %s%s", pl, smtp_command); | |
420a0d19 | 645 | } |
2ea97746 CE |
646 | else |
647 | *message = US string_sprintf("%s [%s]", host->name, host->address); | |
420a0d19 CE |
648 | |
649 | return FALSE; | |
650 | } | |
651 | ||
652 | ||
653 | ||
654 | /************************************************* | |
655 | * Write error message to logs * | |
656 | *************************************************/ | |
657 | ||
658 | /* This writes to the main log and to the message log. | |
659 | ||
660 | Arguments: | |
420a0d19 | 661 | host the current host |
2ea97746 CE |
662 | detail the current message (addr_item->message) |
663 | basic_errno the errno (addr_item->basic_errno) | |
420a0d19 CE |
664 | |
665 | Returns: nothing | |
666 | */ | |
667 | ||
668 | static void | |
2ea97746 | 669 | write_logs(const host_item *host, const uschar *suffix, int basic_errno) |
420a0d19 | 670 | { |
2ea97746 CE |
671 | gstring * message = LOGGING(outgoing_port) |
672 | ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address, | |
673 | host->port == PORT_NONE ? 25 : host->port) | |
674 | : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address); | |
675 | ||
676 | if (suffix) | |
420a0d19 | 677 | { |
2ea97746 CE |
678 | message = string_fmt_append(message, ": %s", suffix); |
679 | if (basic_errno > 0) | |
680 | message = string_fmt_append(message, ": %s", strerror(basic_errno)); | |
420a0d19 CE |
681 | } |
682 | else | |
2ea97746 CE |
683 | message = string_fmt_append(message, " %s", exim_errstr(basic_errno)); |
684 | ||
685 | log_write(0, LOG_MAIN, "%s", string_from_gstring(message)); | |
686 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s); | |
687 | } | |
688 | ||
689 | static void | |
690 | msglog_line(host_item * host, uschar * message) | |
691 | { | |
692 | deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log), | |
693 | host->name, host->address, message); | |
420a0d19 CE |
694 | } |
695 | ||
696 | ||
697 | ||
2ea97746 | 698 | #ifndef DISABLE_EVENT |
420a0d19 CE |
699 | /************************************************* |
700 | * Post-defer action * | |
701 | *************************************************/ | |
702 | ||
703 | /* This expands an arbitrary per-transport string. | |
704 | It might, for example, be used to write to the database log. | |
705 | ||
706 | Arguments: | |
420a0d19 CE |
707 | addr the address item containing error information |
708 | host the current host | |
709 | ||
710 | Returns: nothing | |
711 | */ | |
712 | ||
713 | static void | |
2ea97746 | 714 | deferred_event_raise(address_item *addr, host_item *host) |
420a0d19 | 715 | { |
2ea97746 CE |
716 | uschar * action = addr->transport->event_action; |
717 | const uschar * save_domain; | |
718 | uschar * save_local; | |
719 | ||
420a0d19 | 720 | if (!action) |
2ea97746 | 721 | return; |
420a0d19 | 722 | |
2ea97746 CE |
723 | save_domain = deliver_domain; |
724 | save_local = deliver_localpart; | |
725 | ||
726 | /*XXX would ip & port already be set up? */ | |
727 | deliver_host_address = string_copy(host->address); | |
728 | deliver_host_port = host->port == PORT_NONE ? 25 : host->port; | |
729 | event_defer_errno = addr->basic_errno; | |
420a0d19 CE |
730 | |
731 | router_name = addr->router->name; | |
732 | transport_name = addr->transport->name; | |
2ea97746 CE |
733 | deliver_domain = addr->domain; |
734 | deliver_localpart = addr->local_part; | |
735 | ||
736 | (void) event_raise(action, US"msg:host:defer", | |
737 | addr->message | |
738 | ? addr->basic_errno > 0 | |
739 | ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno)) | |
740 | : string_copy(addr->message) | |
741 | : addr->basic_errno > 0 | |
742 | ? string_copy(US strerror(addr->basic_errno)) | |
743 | : NULL); | |
744 | ||
745 | deliver_localpart = save_local; | |
746 | deliver_domain = save_domain; | |
420a0d19 CE |
747 | router_name = transport_name = NULL; |
748 | } | |
749 | #endif | |
750 | ||
2ea97746 CE |
751 | /************************************************* |
752 | * Reap SMTP specific responses * | |
753 | *************************************************/ | |
754 | static int | |
755 | smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob, | |
756 | int count) | |
757 | { | |
758 | uschar flushbuffer[4096]; | |
759 | ||
760 | while (count-- > 0) | |
761 | { | |
762 | if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer), | |
763 | '2', ob->command_timeout) | |
764 | && (errno != 0 || flushbuffer[0] == 0)) | |
765 | break; | |
766 | } | |
767 | return count; | |
768 | } | |
769 | ||
770 | ||
771 | /* Return boolean success */ | |
772 | ||
773 | static BOOL | |
774 | smtp_reap_banner(smtp_context * sx) | |
775 | { | |
776 | BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), | |
777 | '2', (SOB sx->conn_args.ob)->command_timeout); | |
778 | #ifdef EXPERIMENTAL_DSN_INFO | |
779 | sx->smtp_greeting = string_copy(sx->buffer); | |
780 | #endif | |
781 | return good_response; | |
782 | } | |
783 | ||
784 | static BOOL | |
785 | smtp_reap_ehlo(smtp_context * sx) | |
786 | { | |
787 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', | |
788 | (SOB sx->conn_args.ob)->command_timeout)) | |
789 | { | |
790 | if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp) | |
791 | { | |
792 | #ifdef EXPERIMENTAL_DSN_INFO | |
793 | sx->helo_response = string_copy(sx->buffer); | |
794 | #endif | |
795 | return FALSE; | |
796 | } | |
797 | sx->esmtp = FALSE; | |
798 | } | |
799 | #ifdef EXPERIMENTAL_DSN_INFO | |
800 | sx->helo_response = string_copy(sx->buffer); | |
801 | #endif | |
802 | return TRUE; | |
803 | } | |
804 | ||
805 | ||
806 | ||
807 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
808 | static uschar * | |
809 | ehlo_cache_key(const smtp_context * sx) | |
810 | { | |
811 | host_item * host = sx->conn_args.host; | |
812 | return Ustrchr(host->address, ':') | |
813 | ? string_sprintf("[%s]:%d.EHLO", host->address, | |
814 | host->port == PORT_NONE ? sx->port : host->port) | |
815 | : string_sprintf("%s:%d.EHLO", host->address, | |
816 | host->port == PORT_NONE ? sx->port : host->port); | |
817 | } | |
818 | ||
819 | static void | |
820 | write_ehlo_cache_entry(const smtp_context * sx) | |
821 | { | |
822 | open_db dbblock, * dbm_file; | |
823 | ||
824 | if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE))) | |
825 | { | |
826 | uschar * ehlo_resp_key = ehlo_cache_key(sx); | |
827 | dbdata_ehlo_resp er = { .data = sx->ehlo_resp }; | |
828 | ||
829 | HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n", | |
830 | sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths, | |
831 | sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths); | |
832 | ||
833 | dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er)); | |
834 | dbfn_close(dbm_file); | |
835 | } | |
836 | } | |
837 | ||
838 | static void | |
839 | invalidate_ehlo_cache_entry(smtp_context * sx) | |
840 | { | |
841 | open_db dbblock, * dbm_file; | |
842 | ||
843 | if ( sx->early_pipe_active | |
844 | && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE))) | |
845 | { | |
846 | uschar * ehlo_resp_key = ehlo_cache_key(sx); | |
847 | dbfn_delete(dbm_file, ehlo_resp_key); | |
848 | dbfn_close(dbm_file); | |
849 | } | |
850 | } | |
851 | ||
852 | static BOOL | |
853 | read_ehlo_cache_entry(smtp_context * sx) | |
854 | { | |
855 | open_db dbblock; | |
856 | open_db * dbm_file; | |
857 | ||
858 | if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE))) | |
859 | { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); } | |
860 | else | |
861 | { | |
862 | uschar * ehlo_resp_key = ehlo_cache_key(sx); | |
863 | dbdata_ehlo_resp * er; | |
864 | ||
865 | if (!(er = dbfn_read(dbm_file, ehlo_resp_key))) | |
866 | { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); } | |
867 | else if (time(NULL) - er->time_stamp > retry_data_expire) | |
868 | { | |
869 | DEBUG(D_transport) debug_printf("ehlo-resp record too old\n"); | |
870 | dbfn_close(dbm_file); | |
871 | if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE))) | |
872 | dbfn_delete(dbm_file, ehlo_resp_key); | |
873 | } | |
874 | else | |
875 | { | |
876 | sx->ehlo_resp = er->data; | |
877 | dbfn_close(dbm_file); | |
878 | DEBUG(D_transport) debug_printf( | |
879 | "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n", | |
880 | er->data.cleartext_features, er->data.crypted_features); | |
881 | return TRUE; | |
882 | } | |
883 | dbfn_close(dbm_file); | |
884 | } | |
885 | return FALSE; | |
886 | } | |
887 | ||
888 | ||
889 | ||
890 | /* Return an auths bitmap for the set of AUTH methods offered by the server | |
891 | which match our authenticators. */ | |
892 | ||
893 | static unsigned short | |
894 | study_ehlo_auths(smtp_context * sx) | |
895 | { | |
896 | uschar * names; | |
897 | auth_instance * au; | |
898 | uschar authnum; | |
899 | unsigned short authbits = 0; | |
900 | ||
901 | if (!sx->esmtp) return 0; | |
902 | if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE); | |
903 | if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0; | |
904 | expand_nmax = -1; /* reset */ | |
905 | names = string_copyn(expand_nstring[1], expand_nlength[1]); | |
906 | ||
907 | for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client) | |
908 | { | |
909 | const uschar * list = names; | |
910 | int sep = ' '; | |
911 | uschar name[32]; | |
912 | ||
913 | while (string_nextinlist(&list, &sep, name, sizeof(name))) | |
914 | if (strcmpic(au->public_name, name) == 0) | |
915 | { authbits |= BIT(authnum); break; } | |
916 | } | |
917 | ||
918 | DEBUG(D_transport) | |
919 | debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n", | |
920 | tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits); | |
921 | ||
922 | if (tls_out.active.sock >= 0) | |
923 | sx->ehlo_resp.crypted_auths = authbits; | |
924 | else | |
925 | sx->ehlo_resp.cleartext_auths = authbits; | |
926 | return authbits; | |
927 | } | |
928 | ||
929 | ||
930 | ||
931 | ||
932 | /* Wait for and check responses for early-pipelining. | |
933 | ||
934 | Called from the lower-level smtp_read_response() function | |
935 | used for general code that assume synchronisation, if context | |
936 | flags indicate outstanding early-pipelining commands. Also | |
937 | called fom sync_responses() which handles pipelined commands. | |
938 | ||
939 | Arguments: | |
940 | sx smtp connection context | |
941 | countp number of outstanding responses, adjusted on return | |
942 | ||
943 | Return: | |
944 | OK all well | |
945 | FAIL SMTP error in response | |
946 | */ | |
947 | int | |
948 | smtp_reap_early_pipe(smtp_context * sx, int * countp) | |
949 | { | |
950 | BOOL pending_BANNER = sx->pending_BANNER; | |
951 | BOOL pending_EHLO = sx->pending_EHLO; | |
952 | ||
953 | sx->pending_BANNER = FALSE; /* clear early to avoid recursion */ | |
954 | sx->pending_EHLO = FALSE; | |
955 | ||
956 | if (pending_BANNER) | |
957 | { | |
958 | DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__); | |
959 | (*countp)--; | |
960 | if (!smtp_reap_banner(sx)) | |
961 | { | |
962 | DEBUG(D_transport) debug_printf("bad banner\n"); | |
963 | goto fail; | |
964 | } | |
965 | } | |
966 | ||
967 | if (pending_EHLO) | |
968 | { | |
969 | unsigned peer_offered; | |
970 | unsigned short authbits = 0, * ap; | |
971 | ||
972 | DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__); | |
973 | (*countp)--; | |
974 | if (!smtp_reap_ehlo(sx)) | |
975 | { | |
976 | DEBUG(D_transport) debug_printf("bad response for EHLO\n"); | |
977 | goto fail; | |
978 | } | |
979 | ||
980 | /* Compare the actual EHLO response to the cached value we assumed; | |
981 | on difference, dump or rewrite the cache and arrange for a retry. */ | |
982 | ||
983 | ap = tls_out.active.sock < 0 | |
984 | ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths; | |
985 | ||
986 | peer_offered = ehlo_response(sx->buffer, | |
987 | (tls_out.active.sock < 0 ? OPTION_TLS : OPTION_REQUIRETLS) | |
988 | | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE | |
989 | | OPTION_UTF8 | OPTION_EARLY_PIPE | |
990 | ); | |
991 | if ( peer_offered != sx->peer_offered | |
992 | || (authbits = study_ehlo_auths(sx)) != *ap) | |
993 | { | |
994 | HDEBUG(D_transport) | |
995 | debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n", | |
996 | tls_out.active.sock < 0 ? "cleartext" : "crypted", | |
997 | sx->peer_offered, *ap, peer_offered, authbits); | |
998 | *(tls_out.active.sock < 0 | |
999 | ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered; | |
1000 | *ap = authbits; | |
1001 | if (peer_offered & OPTION_EARLY_PIPE) | |
1002 | write_ehlo_cache_entry(sx); | |
1003 | else | |
1004 | invalidate_ehlo_cache_entry(sx); | |
1005 | ||
1006 | return OK; /* just carry on */ | |
1007 | } | |
1008 | } | |
1009 | return OK; | |
1010 | ||
1011 | fail: | |
1012 | invalidate_ehlo_cache_entry(sx); | |
1013 | (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp); | |
1014 | return FAIL; | |
1015 | } | |
1016 | #endif | |
420a0d19 CE |
1017 | |
1018 | ||
1019 | /************************************************* | |
1020 | * Synchronize SMTP responses * | |
1021 | *************************************************/ | |
1022 | ||
1023 | /* This function is called from smtp_deliver() to receive SMTP responses from | |
1024 | the server, and match them up with the commands to which they relate. When | |
1025 | PIPELINING is not in use, this function is called after every command, and is | |
1026 | therefore somewhat over-engineered, but it is simpler to use a single scheme | |
1027 | that works both with and without PIPELINING instead of having two separate sets | |
1028 | of code. | |
1029 | ||
1030 | The set of commands that are buffered up with pipelining may start with MAIL | |
1031 | and may end with DATA; in between are RCPT commands that correspond to the | |
1032 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, | |
1033 | etc.) are never buffered. | |
1034 | ||
1035 | Errors after MAIL or DATA abort the whole process leaving the response in the | |
1036 | buffer. After MAIL, pending responses are flushed, and the original command is | |
1037 | re-instated in big_buffer for error messages. For RCPT commands, the remote is | |
1038 | permitted to reject some recipient addresses while accepting others. However | |
1039 | certain errors clearly abort the whole process. Set the value in | |
1040 | transport_return to PENDING_OK if the address is accepted. If there is a | |
1041 | subsequent general error, it will get reset accordingly. If not, it will get | |
1042 | converted to OK at the end. | |
1043 | ||
1044 | Arguments: | |
2ea97746 | 1045 | sx smtp connection context |
420a0d19 | 1046 | count the number of responses to read |
420a0d19 CE |
1047 | pending_DATA 0 if last command sent was not DATA |
1048 | +1 if previously had a good recipient | |
1049 | -1 if not previously had a good recipient | |
420a0d19 CE |
1050 | |
1051 | Returns: 3 if at least one address had 2xx and one had 5xx | |
1052 | 2 if at least one address had 5xx but none had 2xx | |
1053 | 1 if at least one host had a 2xx response, but none had 5xx | |
1054 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) | |
1055 | -1 timeout while reading RCPT response | |
1056 | -2 I/O or other non-response error for RCPT | |
1057 | -3 DATA or MAIL failed - errno and buffer set | |
2ea97746 | 1058 | -4 banner or EHLO failed (early-pipelining) |
420a0d19 CE |
1059 | */ |
1060 | ||
1061 | static int | |
2ea97746 | 1062 | sync_responses(smtp_context * sx, int count, int pending_DATA) |
420a0d19 | 1063 | { |
2ea97746 CE |
1064 | address_item * addr = sx->sync_addr; |
1065 | smtp_transport_options_block * ob = sx->conn_args.ob; | |
420a0d19 CE |
1066 | int yield = 0; |
1067 | ||
2ea97746 CE |
1068 | #ifdef EXPERIMENTAL_PIPE_CONNECT |
1069 | if (smtp_reap_early_pipe(sx, &count) != OK) | |
1070 | return -4; | |
1071 | #endif | |
1072 | ||
420a0d19 CE |
1073 | /* Handle the response for a MAIL command. On error, reinstate the original |
1074 | command in big_buffer for error message use, and flush any further pending | |
1075 | responses before returning, except after I/O errors and timeouts. */ | |
1076 | ||
2ea97746 | 1077 | if (sx->pending_MAIL) |
420a0d19 | 1078 | { |
2ea97746 | 1079 | DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__); |
420a0d19 | 1080 | count--; |
2ea97746 CE |
1081 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), |
1082 | '2', ob->command_timeout)) | |
420a0d19 | 1083 | { |
2ea97746 | 1084 | DEBUG(D_transport) debug_printf("bad response for MAIL\n"); |
420a0d19 | 1085 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ |
2ea97746 | 1086 | if (errno == 0 && sx->buffer[0] != 0) |
420a0d19 | 1087 | { |
420a0d19 | 1088 | int save_errno = 0; |
2ea97746 | 1089 | if (sx->buffer[0] == '4') |
420a0d19 CE |
1090 | { |
1091 | save_errno = ERRNO_MAIL4XX; | |
2ea97746 | 1092 | addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
420a0d19 | 1093 | } |
2ea97746 | 1094 | count = smtp_discard_responses(sx, ob, count); |
420a0d19 CE |
1095 | errno = save_errno; |
1096 | } | |
2ea97746 CE |
1097 | |
1098 | if (pending_DATA) count--; /* Number of RCPT responses to come */ | |
1099 | while (count-- > 0) /* Mark any pending addrs with the host used */ | |
1100 | { | |
1101 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; | |
1102 | addr->host_used = sx->conn_args.host; | |
1103 | addr = addr->next; | |
1104 | } | |
420a0d19 CE |
1105 | return -3; |
1106 | } | |
1107 | } | |
1108 | ||
1109 | if (pending_DATA) count--; /* Number of RCPT responses to come */ | |
1110 | ||
1111 | /* Read and handle the required number of RCPT responses, matching each one up | |
1112 | with an address by scanning for the next address whose status is PENDING_DEFER. | |
1113 | */ | |
1114 | ||
1115 | while (count-- > 0) | |
1116 | { | |
2ea97746 CE |
1117 | while (addr->transport_return != PENDING_DEFER) |
1118 | if (!(addr = addr->next)) | |
1119 | return -2; | |
420a0d19 CE |
1120 | |
1121 | /* The address was accepted */ | |
2ea97746 | 1122 | addr->host_used = sx->conn_args.host; |
420a0d19 | 1123 | |
2ea97746 CE |
1124 | DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__); |
1125 | if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), | |
1126 | '2', ob->command_timeout)) | |
420a0d19 CE |
1127 | { |
1128 | yield |= 1; | |
1129 | addr->transport_return = PENDING_OK; | |
1130 | ||
1131 | /* If af_dr_retry_exists is set, there was a routing delay on this address; | |
1132 | ensure that any address-specific retry record is expunged. We do this both | |
1133 | for the basic key and for the version that also includes the sender. */ | |
1134 | ||
1135 | if (testflag(addr, af_dr_retry_exists)) | |
1136 | { | |
1137 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, | |
1138 | sender_address); | |
1139 | retry_add_item(addr, altkey, rf_delete); | |
1140 | retry_add_item(addr, addr->address_retry_key, rf_delete); | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | /* Timeout while reading the response */ | |
1145 | ||
1146 | else if (errno == ETIMEDOUT) | |
1147 | { | |
2ea97746 CE |
1148 | uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>", |
1149 | transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes)); | |
1150 | set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE); | |
420a0d19 CE |
1151 | retry_add_item(addr, addr->address_retry_key, 0); |
1152 | update_waiting = FALSE; | |
1153 | return -1; | |
1154 | } | |
1155 | ||
1156 | /* Handle other errors in obtaining an SMTP response by returning -1. This | |
1157 | will cause all the addresses to be deferred. Restore the SMTP command in | |
1158 | big_buffer for which we are checking the response, so the error message | |
1159 | makes sense. */ | |
1160 | ||
2ea97746 | 1161 | else if (errno != 0 || sx->buffer[0] == 0) |
420a0d19 CE |
1162 | { |
1163 | string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>", | |
2ea97746 | 1164 | transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes)); |
420a0d19 CE |
1165 | return -2; |
1166 | } | |
1167 | ||
1168 | /* Handle SMTP permanent and temporary response codes. */ | |
1169 | ||
1170 | else | |
1171 | { | |
1172 | addr->message = | |
1173 | string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: " | |
2ea97746 CE |
1174 | "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes), |
1175 | string_printing(sx->buffer)); | |
420a0d19 | 1176 | setflag(addr, af_pass_message); |
2ea97746 CE |
1177 | if (!sx->verify) |
1178 | msglog_line(sx->conn_args.host, addr->message); | |
420a0d19 CE |
1179 | |
1180 | /* The response was 5xx */ | |
1181 | ||
2ea97746 | 1182 | if (sx->buffer[0] == '5') |
420a0d19 CE |
1183 | { |
1184 | addr->transport_return = FAIL; | |
1185 | yield |= 2; | |
1186 | } | |
1187 | ||
1188 | /* The response was 4xx */ | |
1189 | ||
1190 | else | |
1191 | { | |
1192 | addr->transport_return = DEFER; | |
1193 | addr->basic_errno = ERRNO_RCPT4XX; | |
2ea97746 | 1194 | addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
420a0d19 | 1195 | |
2ea97746 CE |
1196 | if (!sx->verify) |
1197 | { | |
1198 | #ifndef DISABLE_EVENT | |
1199 | event_defer_errno = addr->more_errno; | |
1200 | msg_event_raise(US"msg:rcpt:host:defer", addr); | |
1201 | #endif | |
420a0d19 | 1202 | |
2ea97746 CE |
1203 | /* Log temporary errors if there are more hosts to be tried. |
1204 | If not, log this last one in the == line. */ | |
1205 | ||
1206 | if (sx->conn_args.host->next) | |
1207 | if (LOGGING(outgoing_port)) | |
1208 | log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name, | |
1209 | sx->conn_args.host->address, | |
1210 | sx->port == PORT_NONE ? 25 : sx->port, addr->message); | |
1211 | else | |
1212 | log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name, | |
1213 | sx->conn_args.host->address, addr->message); | |
1214 | ||
1215 | #ifndef DISABLE_EVENT | |
1216 | else | |
1217 | msg_event_raise(US"msg:rcpt:defer", addr); | |
1218 | #endif | |
420a0d19 | 1219 | |
2ea97746 CE |
1220 | /* Do not put this message on the list of those waiting for specific |
1221 | hosts, as otherwise it is likely to be tried too often. */ | |
420a0d19 | 1222 | |
2ea97746 | 1223 | update_waiting = FALSE; |
420a0d19 | 1224 | |
2ea97746 CE |
1225 | /* Add a retry item for the address so that it doesn't get tried again |
1226 | too soon. If address_retry_include_sender is true, add the sender address | |
1227 | to the retry key. */ | |
420a0d19 | 1228 | |
2ea97746 CE |
1229 | retry_add_item(addr, |
1230 | ob->address_retry_include_sender | |
1231 | ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address) | |
1232 | : addr->address_retry_key, | |
1233 | 0); | |
1234 | } | |
420a0d19 CE |
1235 | } |
1236 | } | |
1237 | } /* Loop for next RCPT response */ | |
1238 | ||
1239 | /* Update where to start at for the next block of responses, unless we | |
1240 | have already handled all the addresses. */ | |
1241 | ||
2ea97746 | 1242 | if (addr) sx->sync_addr = addr->next; |
420a0d19 CE |
1243 | |
1244 | /* Handle a response to DATA. If we have not had any good recipients, either | |
1245 | previously or in this block, the response is ignored. */ | |
1246 | ||
2ea97746 | 1247 | if (pending_DATA != 0) |
420a0d19 | 1248 | { |
2ea97746 CE |
1249 | DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__); |
1250 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), | |
1251 | '3', ob->command_timeout)) | |
420a0d19 | 1252 | { |
2ea97746 CE |
1253 | int code; |
1254 | uschar *msg; | |
1255 | BOOL pass_message; | |
1256 | if (pending_DATA > 0 || (yield & 1) != 0) | |
420a0d19 | 1257 | { |
2ea97746 CE |
1258 | if (errno == 0 && sx->buffer[0] == '4') |
1259 | { | |
1260 | errno = ERRNO_DATA4XX; | |
1261 | sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; | |
1262 | } | |
1263 | return -3; | |
420a0d19 | 1264 | } |
2ea97746 CE |
1265 | (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message); |
1266 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " | |
1267 | "is in use and there were no good recipients\n", msg); | |
420a0d19 | 1268 | } |
420a0d19 CE |
1269 | } |
1270 | ||
1271 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if | |
1272 | present) received 3xx. If any RCPTs were handled and yielded anything other | |
1273 | than 4xx, yield will be set non-zero. */ | |
1274 | ||
1275 | return yield; | |
1276 | } | |
1277 | ||
1278 | ||
1279 | ||
420a0d19 | 1280 | |
420a0d19 | 1281 | |
2ea97746 | 1282 | /* Try an authenticator's client entry */ |
420a0d19 | 1283 | |
2ea97746 CE |
1284 | static int |
1285 | try_authenticator(smtp_context * sx, auth_instance * au) | |
420a0d19 | 1286 | { |
2ea97746 CE |
1287 | smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */ |
1288 | host_item * host = sx->conn_args.host; /* host to deliver to */ | |
1289 | int rc; | |
420a0d19 | 1290 | |
2ea97746 CE |
1291 | sx->outblock.authenticating = TRUE; |
1292 | rc = (au->info->clientcode)(au, sx, ob->command_timeout, | |
1293 | sx->buffer, sizeof(sx->buffer)); | |
1294 | sx->outblock.authenticating = FALSE; | |
1295 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc); | |
420a0d19 | 1296 | |
2ea97746 CE |
1297 | /* A temporary authentication failure must hold up delivery to |
1298 | this host. After a permanent authentication failure, we carry on | |
1299 | to try other authentication methods. If all fail hard, try to | |
1300 | deliver the message unauthenticated unless require_auth was set. */ | |
420a0d19 | 1301 | |
2ea97746 CE |
1302 | switch(rc) |
1303 | { | |
1304 | case OK: | |
1305 | f.smtp_authenticated = TRUE; /* stops the outer loop */ | |
1306 | client_authenticator = au->name; | |
1307 | if (au->set_client_id) | |
1308 | client_authenticated_id = expand_string(au->set_client_id); | |
1309 | break; | |
420a0d19 | 1310 | |
2ea97746 | 1311 | /* Failure after writing a command */ |
420a0d19 | 1312 | |
2ea97746 CE |
1313 | case FAIL_SEND: |
1314 | return FAIL_SEND; | |
420a0d19 | 1315 | |
2ea97746 | 1316 | /* Failure after reading a response */ |
420a0d19 | 1317 | |
2ea97746 CE |
1318 | case FAIL: |
1319 | if (errno != 0 || sx->buffer[0] != '5') return FAIL; | |
1320 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", | |
1321 | au->name, host->name, host->address, sx->buffer); | |
1322 | break; | |
420a0d19 | 1323 | |
2ea97746 CE |
1324 | /* Failure by some other means. In effect, the authenticator |
1325 | decided it wasn't prepared to handle this case. Typically this | |
1326 | is the result of "fail" in an expansion string. Do we need to | |
1327 | log anything here? Feb 2006: a message is now put in the buffer | |
1328 | if logging is required. */ | |
1329 | ||
1330 | case CANCELLED: | |
1331 | if (*sx->buffer != 0) | |
1332 | log_write(0, LOG_MAIN, "%s authenticator cancelled " | |
1333 | "authentication H=%s [%s] %s", au->name, host->name, | |
1334 | host->address, sx->buffer); | |
1335 | break; | |
420a0d19 | 1336 | |
2ea97746 | 1337 | /* Internal problem, message in buffer. */ |
420a0d19 | 1338 | |
2ea97746 CE |
1339 | case ERROR: |
1340 | set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer), | |
1341 | DEFER, FALSE); | |
1342 | return ERROR; | |
1343 | } | |
1344 | return OK; | |
1345 | } | |
420a0d19 | 1346 | |
420a0d19 | 1347 | |
420a0d19 | 1348 | |
420a0d19 | 1349 | |
2ea97746 | 1350 | /* Do the client side of smtp-level authentication. |
420a0d19 | 1351 | |
2ea97746 CE |
1352 | Arguments: |
1353 | sx smtp connection context | |
420a0d19 | 1354 | |
2ea97746 | 1355 | sx->buffer should have the EHLO response from server (gets overwritten) |
420a0d19 | 1356 | |
2ea97746 CE |
1357 | Returns: |
1358 | OK Success, or failed (but not required): global "smtp_authenticated" set | |
1359 | DEFER Failed authentication (and was required) | |
1360 | ERROR Internal problem | |
420a0d19 | 1361 | |
2ea97746 CE |
1362 | FAIL_SEND Failed communications - transmit |
1363 | FAIL - response | |
1364 | */ | |
1365 | ||
1366 | static int | |
1367 | smtp_auth(smtp_context * sx) | |
1368 | { | |
1369 | host_item * host = sx->conn_args.host; /* host to deliver to */ | |
1370 | smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */ | |
1371 | int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host); | |
1372 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
1373 | unsigned short authbits = tls_out.active.sock >= 0 | |
1374 | ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths; | |
1375 | #endif | |
1376 | uschar * fail_reason = US"server did not advertise AUTH support"; | |
1377 | ||
1378 | f.smtp_authenticated = FALSE; | |
1379 | client_authenticator = client_authenticated_id = client_authenticated_sender = NULL; | |
1380 | ||
1381 | if (!regex_AUTH) | |
1382 | regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE); | |
1383 | ||
1384 | /* Is the server offering AUTH? */ | |
1385 | ||
1386 | if ( sx->esmtp | |
1387 | && | |
1388 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
1389 | sx->early_pipe_active ? authbits | |
1390 | : | |
1391 | #endif | |
1392 | regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1) | |
1393 | ) | |
1394 | { | |
1395 | uschar * names = NULL; | |
1396 | expand_nmax = -1; /* reset */ | |
1397 | ||
1398 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
1399 | if (!sx->early_pipe_active) | |
1400 | #endif | |
1401 | names = string_copyn(expand_nstring[1], expand_nlength[1]); | |
1402 | ||
1403 | /* Must not do this check until after we have saved the result of the | |
1404 | regex match above as the check could be another RE. */ | |
1405 | ||
1406 | if ( require_auth == OK | |
1407 | || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK) | |
1408 | { | |
1409 | auth_instance * au; | |
1410 | ||
1411 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); | |
1412 | fail_reason = US"no common mechanisms were found"; | |
1413 | ||
1414 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
1415 | if (sx->early_pipe_active) | |
1416 | { | |
1417 | /* Scan our authenticators (which support use by a client and were offered | |
1418 | by the server (checked at cache-write time)), not suppressed by | |
1419 | client_condition. If one is found, attempt to authenticate by calling its | |
1420 | client function. We are limited to supporting up to 16 authenticator | |
1421 | public-names by the number of bits in a short. */ | |
1422 | ||
1423 | uschar bitnum; | |
1424 | int rc; | |
1425 | ||
1426 | for (bitnum = 0, au = auths; | |
1427 | !f.smtp_authenticated && au && bitnum < 16; | |
1428 | bitnum++, au = au->next) if (authbits & BIT(bitnum)) | |
1429 | { | |
1430 | if ( au->client_condition | |
1431 | && !expand_check_condition(au->client_condition, au->name, | |
1432 | US"client authenticator")) | |
1433 | { | |
1434 | DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n", | |
1435 | au->name, "client_condition is false"); | |
1436 | continue; | |
1437 | } | |
1438 | ||
1439 | /* Found data for a listed mechanism. Call its client entry. Set | |
1440 | a flag in the outblock so that data is overwritten after sending so | |
1441 | that reflections don't show it. */ | |
1442 | ||
1443 | fail_reason = US"authentication attempt(s) failed"; | |
1444 | ||
1445 | if ((rc = try_authenticator(sx, au)) != OK) | |
1446 | return rc; | |
1447 | } | |
1448 | } | |
1449 | else | |
1450 | #endif | |
1451 | ||
1452 | /* Scan the configured authenticators looking for one which is configured | |
1453 | for use as a client, which is not suppressed by client_condition, and | |
1454 | whose name matches an authentication mechanism supported by the server. | |
1455 | If one is found, attempt to authenticate by calling its client function. | |
1456 | */ | |
1457 | ||
1458 | for (au = auths; !f.smtp_authenticated && au; au = au->next) | |
1459 | { | |
1460 | uschar *p = names; | |
1461 | ||
1462 | if ( !au->client | |
1463 | || ( au->client_condition | |
1464 | && !expand_check_condition(au->client_condition, au->name, | |
1465 | US"client authenticator"))) | |
1466 | { | |
1467 | DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n", | |
1468 | au->name, | |
1469 | (au->client)? "client_condition is false" : | |
1470 | "not configured as a client"); | |
1471 | continue; | |
1472 | } | |
1473 | ||
1474 | /* Loop to scan supported server mechanisms */ | |
1475 | ||
1476 | while (*p) | |
1477 | { | |
1478 | int len = Ustrlen(au->public_name); | |
1479 | int rc; | |
1480 | ||
1481 | while (isspace(*p)) p++; | |
1482 | ||
1483 | if (strncmpic(au->public_name, p, len) != 0 || | |
1484 | (p[len] != 0 && !isspace(p[len]))) | |
1485 | { | |
1486 | while (*p != 0 && !isspace(*p)) p++; | |
1487 | continue; | |
1488 | } | |
1489 | ||
1490 | /* Found data for a listed mechanism. Call its client entry. Set | |
1491 | a flag in the outblock so that data is overwritten after sending so | |
1492 | that reflections don't show it. */ | |
1493 | ||
1494 | fail_reason = US"authentication attempt(s) failed"; | |
1495 | ||
1496 | if ((rc = try_authenticator(sx, au)) != OK) | |
1497 | return rc; | |
1498 | ||
1499 | break; /* If not authenticated, try next authenticator */ | |
1500 | } /* Loop for scanning supported server mechanisms */ | |
1501 | } /* Loop for further authenticators */ | |
1502 | } | |
1503 | } | |
1504 | ||
1505 | /* If we haven't authenticated, but are required to, give up. */ | |
1506 | ||
1507 | if (require_auth == OK && !f.smtp_authenticated) | |
1508 | { | |
1509 | set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL, | |
1510 | string_sprintf("authentication required but %s", fail_reason), DEFER, | |
1511 | FALSE); | |
1512 | return DEFER; | |
1513 | } | |
1514 | ||
1515 | return OK; | |
420a0d19 CE |
1516 | } |
1517 | ||
1518 | ||
1519 | /* Construct AUTH appendix string for MAIL TO */ | |
1520 | /* | |
1521 | Arguments | |
1522 | buffer to build string | |
1523 | addrlist chain of potential addresses to deliver | |
1524 | ob transport options | |
1525 | ||
2ea97746 | 1526 | Globals f.smtp_authenticated |
420a0d19 CE |
1527 | client_authenticated_sender |
1528 | Return True on error, otherwise buffer has (possibly empty) terminated string | |
1529 | */ | |
1530 | ||
1531 | BOOL | |
1532 | smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist, | |
1533 | smtp_transport_options_block *ob) | |
1534 | { | |
1535 | uschar *local_authenticated_sender = authenticated_sender; | |
1536 | ||
1537 | #ifdef notdef | |
2ea97746 | 1538 | debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N"); |
420a0d19 CE |
1539 | #endif |
1540 | ||
1541 | if (ob->authenticated_sender != NULL) | |
1542 | { | |
1543 | uschar *new = expand_string(ob->authenticated_sender); | |
1544 | if (new == NULL) | |
1545 | { | |
2ea97746 | 1546 | if (!f.expand_string_forcedfail) |
420a0d19 CE |
1547 | { |
1548 | uschar *message = string_sprintf("failed to expand " | |
1549 | "authenticated_sender: %s", expand_string_message); | |
2ea97746 | 1550 | set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE); |
420a0d19 CE |
1551 | return TRUE; |
1552 | } | |
1553 | } | |
1554 | else if (new[0] != 0) local_authenticated_sender = new; | |
1555 | } | |
1556 | ||
1557 | /* Add the authenticated sender address if present */ | |
1558 | ||
2ea97746 | 1559 | if ((f.smtp_authenticated || ob->authenticated_sender_force) && |
420a0d19 CE |
1560 | local_authenticated_sender != NULL) |
1561 | { | |
1562 | string_format(buffer, bufsize, " AUTH=%s", | |
1563 | auth_xtextencode(local_authenticated_sender, | |
1564 | Ustrlen(local_authenticated_sender))); | |
1565 | client_authenticated_sender = string_copy(local_authenticated_sender); | |
1566 | } | |
1567 | else | |
1568 | *buffer= 0; | |
1569 | ||
1570 | return FALSE; | |
1571 | } | |
1572 | ||
1573 | ||
1574 | ||
2ea97746 CE |
1575 | #ifdef SUPPORT_DANE |
1576 | /* Lookup TLSA record for host/port. | |
1577 | Return: OK success with dnssec; DANE mode | |
1578 | DEFER Do not use this host now, may retry later | |
1579 | FAIL_FORCED No TLSA record; DANE not usable | |
1580 | FAIL Do not use this connection | |
1581 | */ | |
420a0d19 | 1582 | |
2ea97746 CE |
1583 | int |
1584 | tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required) | |
1585 | { | |
1586 | /* move this out to host.c given the similarity to dns_lookup() ? */ | |
1587 | uschar buffer[300]; | |
1588 | const uschar * fullname = buffer; | |
1589 | int rc; | |
1590 | BOOL sec; | |
420a0d19 | 1591 | |
2ea97746 CE |
1592 | /* TLSA lookup string */ |
1593 | (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name); | |
420a0d19 | 1594 | |
2ea97746 CE |
1595 | rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname); |
1596 | sec = dns_is_secure(dnsa); | |
1597 | DEBUG(D_transport) | |
1598 | debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not "); | |
1599 | ||
1600 | switch (rc) | |
1601 | { | |
1602 | case DNS_AGAIN: | |
1603 | return DEFER; /* just defer this TLS'd conn */ | |
1604 | ||
1605 | case DNS_SUCCEED: | |
1606 | if (sec) | |
1607 | { | |
1608 | DEBUG(D_transport) | |
1609 | { | |
1610 | dns_scan dnss; | |
1611 | dns_record * rr; | |
1612 | for (rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr; | |
1613 | rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) | |
1614 | if (rr->type == T_TLSA && rr->size > 3) | |
1615 | { | |
1616 | uint16_t payload_length = rr->size - 3; | |
1617 | uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data; | |
1618 | ||
1619 | sp += sprintf(CS sp, "%d ", *p++); /* usage */ | |
1620 | sp += sprintf(CS sp, "%d ", *p++); /* selector */ | |
1621 | sp += sprintf(CS sp, "%d ", *p++); /* matchtype */ | |
1622 | while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4)) | |
1623 | sp += sprintf(CS sp, "%02x", *p++); | |
1624 | ||
1625 | debug_printf(" %s\n", s); | |
1626 | } | |
1627 | } | |
1628 | return OK; | |
1629 | } | |
1630 | log_write(0, LOG_MAIN, | |
1631 | "DANE error: TLSA lookup for %s not DNSSEC", host->name); | |
1632 | /*FALLTRHOUGH*/ | |
1633 | ||
1634 | case DNS_NODATA: /* no TLSA RR for this lookup */ | |
1635 | case DNS_NOMATCH: /* no records at all for this lookup */ | |
1636 | return dane_required ? FAIL : FAIL_FORCED; | |
1637 | ||
1638 | default: | |
1639 | case DNS_FAIL: | |
1640 | return dane_required ? FAIL : DEFER; | |
1641 | } | |
1642 | } | |
1643 | #endif | |
1644 | ||
1645 | ||
1646 | ||
1647 | typedef struct smtp_compare_s | |
1648 | { | |
1649 | uschar *current_sender_address; | |
1650 | struct transport_instance *tblock; | |
1651 | } smtp_compare_t; | |
1652 | ||
1653 | ||
1654 | /* Create a unique string that identifies this message, it is based on | |
1655 | sender_address, helo_data and tls_certificate if enabled. | |
1656 | */ | |
1657 | ||
1658 | static uschar * | |
1659 | smtp_local_identity(uschar * sender, struct transport_instance * tblock) | |
1660 | { | |
1661 | address_item * addr1; | |
1662 | uschar * if1 = US""; | |
1663 | uschar * helo1 = US""; | |
1664 | #ifdef SUPPORT_TLS | |
1665 | uschar * tlsc1 = US""; | |
1666 | #endif | |
1667 | uschar * save_sender_address = sender_address; | |
1668 | uschar * local_identity = NULL; | |
1669 | smtp_transport_options_block * ob = SOB tblock->options_block; | |
1670 | ||
1671 | sender_address = sender; | |
1672 | ||
1673 | addr1 = deliver_make_addr (sender, TRUE); | |
1674 | deliver_set_expansions(addr1); | |
1675 | ||
1676 | if (ob->interface) | |
1677 | if1 = expand_string(ob->interface); | |
1678 | ||
1679 | if (ob->helo_data) | |
1680 | helo1 = expand_string(ob->helo_data); | |
1681 | ||
1682 | #ifdef SUPPORT_TLS | |
1683 | if (ob->tls_certificate) | |
1684 | tlsc1 = expand_string(ob->tls_certificate); | |
1685 | local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1); | |
1686 | #else | |
1687 | local_identity = string_sprintf ("%s^%s", if1, helo1); | |
1688 | #endif | |
1689 | ||
1690 | deliver_set_expansions(NULL); | |
1691 | sender_address = save_sender_address; | |
1692 | ||
1693 | return local_identity; | |
1694 | } | |
1695 | ||
1696 | ||
1697 | ||
1698 | /* This routine is a callback that is called from transport_check_waiting. | |
1699 | This function will evaluate the incoming message versus the previous | |
1700 | message. If the incoming message is using a different local identity then | |
1701 | we will veto this new message. */ | |
1702 | ||
1703 | static BOOL | |
1704 | smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare) | |
1705 | { | |
1706 | uschar * message_local_identity, | |
1707 | * current_local_identity, | |
1708 | * new_sender_address; | |
1709 | ||
1710 | current_local_identity = | |
1711 | smtp_local_identity(s_compare->current_sender_address, s_compare->tblock); | |
1712 | ||
1713 | if (!(new_sender_address = deliver_get_sender_address(message_id))) | |
1714 | return 0; | |
1715 | ||
1716 | message_local_identity = | |
1717 | smtp_local_identity(new_sender_address, s_compare->tblock); | |
1718 | ||
1719 | return Ustrcmp(current_local_identity, message_local_identity) == 0; | |
1720 | } | |
1721 | ||
1722 | ||
1723 | ||
1724 | static unsigned | |
1725 | ehlo_response(uschar * buf, unsigned checks) | |
1726 | { | |
1727 | size_t bsize = Ustrlen(buf); | |
1728 | ||
1729 | /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */ | |
1730 | ||
1731 | #ifdef SUPPORT_TLS | |
1732 | # ifdef EXPERIMENTAL_REQUIRETLS | |
1733 | if ( checks & OPTION_REQUIRETLS | |
1734 | && pcre_exec(regex_REQUIRETLS, NULL, CS buf,bsize, 0, PCRE_EOPT, NULL,0) < 0) | |
1735 | # endif | |
1736 | checks &= ~OPTION_REQUIRETLS; | |
1737 | ||
1738 | if ( checks & OPTION_TLS | |
1739 | && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) | |
1740 | #endif | |
1741 | checks &= ~OPTION_TLS; | |
1742 | ||
1743 | if ( checks & OPTION_IGNQ | |
1744 | && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0, | |
1745 | PCRE_EOPT, NULL, 0) < 0) | |
1746 | checks &= ~OPTION_IGNQ; | |
1747 | ||
1748 | if ( checks & OPTION_CHUNKING | |
1749 | && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) | |
1750 | checks &= ~OPTION_CHUNKING; | |
1751 | ||
1752 | #ifndef DISABLE_PRDR | |
1753 | if ( checks & OPTION_PRDR | |
1754 | && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) | |
1755 | #endif | |
1756 | checks &= ~OPTION_PRDR; | |
420a0d19 | 1757 | |
2ea97746 CE |
1758 | #ifdef SUPPORT_I18N |
1759 | if ( checks & OPTION_UTF8 | |
1760 | && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) | |
1761 | #endif | |
1762 | checks &= ~OPTION_UTF8; | |
1763 | ||
1764 | if ( checks & OPTION_DSN | |
1765 | && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) | |
1766 | checks &= ~OPTION_DSN; | |
1767 | ||
1768 | if ( checks & OPTION_PIPE | |
1769 | && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0, | |
1770 | PCRE_EOPT, NULL, 0) < 0) | |
1771 | checks &= ~OPTION_PIPE; | |
1772 | ||
1773 | if ( checks & OPTION_SIZE | |
1774 | && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) | |
1775 | checks &= ~OPTION_SIZE; | |
1776 | ||
1777 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
1778 | if ( checks & OPTION_EARLY_PIPE | |
1779 | && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0, | |
1780 | PCRE_EOPT, NULL, 0) < 0) | |
1781 | #endif | |
1782 | checks &= ~OPTION_EARLY_PIPE; | |
1783 | ||
1784 | /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */ | |
1785 | return checks; | |
1786 | } | |
1787 | ||
1788 | ||
1789 | ||
1790 | /* Callback for emitting a BDAT data chunk header. | |
1791 | ||
1792 | If given a nonzero size, first flush any buffered SMTP commands | |
1793 | then emit the command. | |
1794 | ||
1795 | Reap previous SMTP command responses if requested, and always reap | |
1796 | the response from a previous BDAT command. | |
1797 | ||
1798 | Args: | |
1799 | tctx transport context | |
1800 | chunk_size value for SMTP BDAT command | |
1801 | flags | |
1802 | tc_chunk_last add LAST option to SMTP BDAT command | |
1803 | tc_reap_prev reap response to previous SMTP commands | |
1804 | ||
1805 | Returns: OK or ERROR | |
1806 | */ | |
1807 | ||
1808 | static int | |
1809 | smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size, | |
1810 | unsigned flags) | |
1811 | { | |
1812 | smtp_transport_options_block * ob = SOB tctx->tblock->options_block; | |
1813 | smtp_context * sx = tctx->smtp_context; | |
1814 | int cmd_count = 0; | |
1815 | int prev_cmd_count; | |
1816 | ||
1817 | /* Write SMTP chunk header command. If not reaping responses, note that | |
1818 | there may be more writes (like, the chunk data) done soon. */ | |
1819 | ||
1820 | if (chunk_size > 0) | |
1821 | { | |
1822 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
1823 | BOOL new_conn = !!(sx->outblock.conn_args); | |
1824 | #endif | |
1825 | if((cmd_count = smtp_write_command(sx, | |
1826 | flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE, | |
1827 | "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "") | |
1828 | ) < 0) return ERROR; | |
1829 | if (flags & tc_chunk_last) | |
1830 | data_command = string_copy(big_buffer); /* Save for later error message */ | |
1831 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
1832 | /* That command write could have been the one that made the connection. | |
1833 | Copy the fd from the client conn ctx (smtp transport specific) to the | |
1834 | generic transport ctx. */ | |
1835 | ||
1836 | if (new_conn) | |
1837 | tctx->u.fd = sx->outblock.cctx->sock; | |
1838 | #endif | |
1839 | } | |
1840 | ||
1841 | prev_cmd_count = cmd_count += sx->cmd_count; | |
1842 | ||
1843 | /* Reap responses for any previous, but not one we just emitted */ | |
1844 | ||
1845 | if (chunk_size > 0) | |
1846 | prev_cmd_count--; | |
1847 | if (sx->pending_BDAT) | |
1848 | prev_cmd_count--; | |
1849 | ||
1850 | if (flags & tc_reap_prev && prev_cmd_count > 0) | |
1851 | { | |
1852 | DEBUG(D_transport) debug_printf("look for %d responses" | |
1853 | " for previous pipelined cmds\n", prev_cmd_count); | |
1854 | ||
1855 | switch(sync_responses(sx, prev_cmd_count, 0)) | |
1856 | { | |
1857 | case 1: /* 2xx (only) => OK */ | |
1858 | case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */ | |
1859 | case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */ | |
1860 | case 0: break; /* No 2xx or 5xx, but no probs */ | |
1861 | ||
1862 | case -1: /* Timeout on RCPT */ | |
1863 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
1864 | case -4: /* non-2xx for pipelined banner or EHLO */ | |
1865 | #endif | |
1866 | default: return ERROR; /* I/O error, or any MAIL/DATA error */ | |
1867 | } | |
1868 | cmd_count = 1; | |
1869 | if (!sx->pending_BDAT) | |
1870 | pipelining_active = FALSE; | |
1871 | } | |
1872 | ||
1873 | /* Reap response for an outstanding BDAT */ | |
1874 | ||
1875 | if (sx->pending_BDAT) | |
1876 | { | |
1877 | DEBUG(D_transport) debug_printf("look for one response for BDAT\n"); | |
1878 | ||
1879 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', | |
1880 | ob->command_timeout)) | |
1881 | { | |
1882 | if (errno == 0 && sx->buffer[0] == '4') | |
1883 | { | |
1884 | errno = ERRNO_DATA4XX; /*XXX does this actually get used? */ | |
1885 | sx->addrlist->more_errno |= | |
1886 | ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; | |
1887 | } | |
1888 | return ERROR; | |
1889 | } | |
1890 | cmd_count--; | |
1891 | sx->pending_BDAT = FALSE; | |
1892 | pipelining_active = FALSE; | |
1893 | } | |
1894 | else if (chunk_size > 0) | |
1895 | sx->pending_BDAT = TRUE; | |
1896 | ||
1897 | ||
1898 | sx->cmd_count = cmd_count; | |
1899 | return OK; | |
1900 | } | |
1901 | ||
1902 | ||
1903 | ||
1904 | ||
1905 | ||
1906 | /************************************************* | |
1907 | * Make connection for given message * | |
1908 | *************************************************/ | |
1909 | ||
1910 | /* | |
420a0d19 | 1911 | Arguments: |
2ea97746 | 1912 | ctx connection context |
420a0d19 CE |
1913 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for |
1914 | a second attempt after TLS initialization fails | |
1915 | ||
1916 | Returns: OK - the connection was made and the delivery attempted; | |
2ea97746 | 1917 | fd is set in the conn context, tls_out set up. |
420a0d19 CE |
1918 | DEFER - the connection could not be made, or something failed |
1919 | while setting up the SMTP session, or there was a | |
1920 | non-message-specific error, such as a timeout. | |
2ea97746 CE |
1921 | ERROR - helo_data or add_headers or authenticated_sender is |
1922 | specified for this transport, and the string failed | |
1923 | to expand | |
420a0d19 | 1924 | */ |
2ea97746 CE |
1925 | int |
1926 | smtp_setup_conn(smtp_context * sx, BOOL suppress_tls) | |
420a0d19 | 1927 | { |
2ea97746 CE |
1928 | #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE) |
1929 | dns_answer tlsa_dnsa; | |
1930 | #endif | |
1931 | smtp_transport_options_block * ob = sx->conn_args.tblock->options_block; | |
1932 | BOOL pass_message = FALSE; | |
1933 | uschar * message = NULL; | |
420a0d19 | 1934 | int yield = OK; |
420a0d19 | 1935 | int rc; |
2ea97746 CE |
1936 | |
1937 | sx->conn_args.ob = ob; | |
1938 | ||
1939 | sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0; | |
1940 | sx->smtps = strcmpic(ob->protocol, US"smtps") == 0; | |
1941 | sx->ok = FALSE; | |
1942 | sx->send_rset = TRUE; | |
1943 | sx->send_quit = TRUE; | |
1944 | sx->setting_up = TRUE; | |
1945 | sx->esmtp = TRUE; | |
1946 | sx->esmtp_sent = FALSE; | |
1947 | #ifdef SUPPORT_I18N | |
1948 | sx->utf8_needed = FALSE; | |
420a0d19 | 1949 | #endif |
2ea97746 CE |
1950 | sx->dsn_all_lasthop = TRUE; |
1951 | #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE) | |
1952 | sx->dane = FALSE; | |
1953 | sx->dane_required = | |
1954 | verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK; | |
1955 | #endif | |
1956 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
1957 | sx->early_pipe_active = sx->early_pipe_ok = FALSE; | |
1958 | sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; | |
1959 | sx->pending_BANNER = sx->pending_EHLO = FALSE; | |
420a0d19 | 1960 | #endif |
420a0d19 | 1961 | |
2ea97746 CE |
1962 | if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999; |
1963 | sx->peer_offered = 0; | |
1964 | sx->avoid_option = 0; | |
1965 | sx->igquotstr = US""; | |
1966 | if (!sx->helo_data) sx->helo_data = ob->helo_data; | |
1967 | #ifdef EXPERIMENTAL_DSN_INFO | |
1968 | sx->smtp_greeting = NULL; | |
1969 | sx->helo_response = NULL; | |
1970 | #endif | |
420a0d19 | 1971 | |
420a0d19 | 1972 | smtp_command = US"initial connection"; |
2ea97746 | 1973 | sx->buffer[0] = '\0'; |
420a0d19 CE |
1974 | |
1975 | /* Set up the buffer for reading SMTP response packets. */ | |
1976 | ||
2ea97746 CE |
1977 | sx->inblock.buffer = sx->inbuffer; |
1978 | sx->inblock.buffersize = sizeof(sx->inbuffer); | |
1979 | sx->inblock.ptr = sx->inbuffer; | |
1980 | sx->inblock.ptrend = sx->inbuffer; | |
420a0d19 CE |
1981 | |
1982 | /* Set up the buffer for holding SMTP commands while pipelining */ | |
1983 | ||
2ea97746 CE |
1984 | sx->outblock.buffer = sx->outbuffer; |
1985 | sx->outblock.buffersize = sizeof(sx->outbuffer); | |
1986 | sx->outblock.ptr = sx->outbuffer; | |
1987 | sx->outblock.cmd_count = 0; | |
1988 | sx->outblock.authenticating = FALSE; | |
1989 | sx->outblock.conn_args = NULL; | |
420a0d19 CE |
1990 | |
1991 | /* Reset the parameters of a TLS session. */ | |
1992 | ||
1993 | tls_out.bits = 0; | |
1994 | tls_out.cipher = NULL; /* the one we may use for this transport */ | |
1995 | tls_out.ourcert = NULL; | |
1996 | tls_out.peercert = NULL; | |
1997 | tls_out.peerdn = NULL; | |
1998 | #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS) | |
1999 | tls_out.sni = NULL; | |
2000 | #endif | |
2001 | tls_out.ocsp = OCSP_NOT_REQ; | |
2002 | ||
2003 | /* Flip the legacy TLS-related variables over to the outbound set in case | |
2004 | they're used in the context of the transport. Don't bother resetting | |
2ea97746 CE |
2005 | afterward (when being used by a transport) as we're in a subprocess. |
2006 | For verify, unflipped once the callout is dealt with */ | |
420a0d19 CE |
2007 | |
2008 | tls_modify_variables(&tls_out); | |
2009 | ||
2010 | #ifndef SUPPORT_TLS | |
2ea97746 | 2011 | if (sx->smtps) |
420a0d19 | 2012 | { |
2ea97746 CE |
2013 | set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available", |
2014 | DEFER, FALSE); | |
420a0d19 CE |
2015 | return ERROR; |
2016 | } | |
2017 | #endif | |
2018 | ||
2019 | /* Make a connection to the host if this isn't a continued delivery, and handle | |
2020 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled | |
2021 | specially so they can be identified for retries. */ | |
2022 | ||
2ea97746 | 2023 | if (!continue_hostname) |
420a0d19 | 2024 | { |
2ea97746 CE |
2025 | if (sx->verify) |
2026 | HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port); | |
420a0d19 | 2027 | |
2ea97746 CE |
2028 | /* Get the actual port the connection will use, into sx->conn_args.host */ |
2029 | ||
2030 | smtp_port_for_connect(sx->conn_args.host, sx->port); | |
2031 | ||
2032 | #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE) | |
2033 | /* Do TLSA lookup for DANE */ | |
2034 | { | |
2035 | tls_out.dane_verified = FALSE; | |
2036 | tls_out.tlsa_usage = 0; | |
2037 | ||
2038 | if (sx->conn_args.host->dnssec == DS_YES) | |
2039 | { | |
2040 | if( sx->dane_required | |
2041 | || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK | |
2042 | ) | |
2043 | switch (rc = tlsa_lookup(sx->conn_args.host, &tlsa_dnsa, sx->dane_required)) | |
2044 | { | |
2045 | case OK: sx->dane = TRUE; | |
2046 | ob->tls_tempfail_tryclear = FALSE; | |
2047 | break; | |
2048 | case FAIL_FORCED: break; | |
2049 | default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER, | |
2050 | string_sprintf("DANE error: tlsa lookup %s", | |
2051 | rc == DEFER ? "DEFER" : "FAIL"), | |
2052 | rc, FALSE); | |
2053 | # ifndef DISABLE_EVENT | |
2054 | (void) event_raise(sx->conn_args.tblock->event_action, | |
2055 | US"dane:fail", sx->dane_required | |
2056 | ? US"dane-required" : US"dnssec-invalid"); | |
2057 | # endif | |
2058 | return rc; | |
2059 | } | |
2060 | } | |
2061 | else if (sx->dane_required) | |
2062 | { | |
2063 | set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER, | |
2064 | string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name), | |
2065 | FAIL, FALSE); | |
2066 | # ifndef DISABLE_EVENT | |
2067 | (void) event_raise(sx->conn_args.tblock->event_action, | |
2068 | US"dane:fail", US"dane-required"); | |
2069 | # endif | |
2070 | return FAIL; | |
2071 | } | |
2072 | } | |
2073 | #endif /*DANE*/ | |
2074 | ||
2075 | /* Make the TCP connection */ | |
2076 | ||
2077 | sx->cctx.tls_ctx = NULL; | |
2078 | sx->inblock.cctx = sx->outblock.cctx = &sx->cctx; | |
2079 | sx->avoid_option = sx->peer_offered = smtp_peer_options = 0; | |
2080 | ||
2081 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2082 | if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK) | |
420a0d19 | 2083 | { |
2ea97746 CE |
2084 | sx->early_pipe_ok = TRUE; |
2085 | if ( read_ehlo_cache_entry(sx) | |
2086 | && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE) | |
2087 | { | |
2088 | DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n"); | |
2089 | sx->early_pipe_active = TRUE; | |
2090 | sx->peer_offered = sx->ehlo_resp.cleartext_features; | |
2091 | } | |
420a0d19 CE |
2092 | } |
2093 | ||
2ea97746 CE |
2094 | if (sx->early_pipe_active) |
2095 | sx->outblock.conn_args = &sx->conn_args; | |
2096 | else | |
2097 | #endif | |
2098 | { | |
2099 | if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0) | |
2100 | { | |
2101 | uschar * msg = NULL; | |
2102 | if (sx->verify) | |
2103 | { | |
2104 | msg = US strerror(errno); | |
2105 | HDEBUG(D_verify) debug_printf("connect: %s\n", msg); | |
2106 | } | |
2107 | set_errno_nohost(sx->addrlist, | |
2108 | errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno, | |
2109 | sx->verify ? string_sprintf("could not connect: %s", msg) | |
2110 | : NULL, | |
2111 | DEFER, FALSE); | |
2112 | sx->send_quit = FALSE; | |
2113 | return DEFER; | |
2114 | } | |
2115 | } | |
420a0d19 CE |
2116 | /* Expand the greeting message while waiting for the initial response. (Makes |
2117 | sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is | |
2118 | delayed till here so that $sending_interface and $sending_port are set. */ | |
2ea97746 CE |
2119 | /*XXX early-pipe: they still will not be. Is there any way to find out what they |
2120 | will be? Somehow I doubt it. */ | |
2121 | ||
2122 | if (sx->helo_data) | |
2123 | if (!(sx->helo_data = expand_string(sx->helo_data))) | |
2124 | if (sx->verify) | |
2125 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2126 | "<%s>: failed to expand transport's helo_data value for callout: %s", | |
2127 | sx->addrlist->address, expand_string_message); | |
2128 | ||
2129 | #ifdef SUPPORT_I18N | |
2130 | if (sx->helo_data) | |
2131 | { | |
2132 | expand_string_message = NULL; | |
2133 | if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data, | |
2134 | &expand_string_message)), | |
2135 | expand_string_message) | |
2136 | if (sx->verify) | |
2137 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2138 | "<%s>: failed to expand transport's helo_data value for callout: %s", | |
2139 | sx->addrlist->address, expand_string_message); | |
2140 | else | |
2141 | sx->helo_data = NULL; | |
2142 | } | |
2143 | #endif | |
420a0d19 CE |
2144 | |
2145 | /* The first thing is to wait for an initial OK response. The dreaded "goto" | |
2146 | is nevertheless a reasonably clean way of programming this kind of logic, | |
2147 | where you want to escape on any error. */ | |
2148 | ||
2ea97746 | 2149 | if (!sx->smtps) |
420a0d19 | 2150 | { |
2ea97746 CE |
2151 | #ifdef EXPERIMENTAL_PIPE_CONNECT |
2152 | if (sx->early_pipe_active) | |
2153 | { | |
2154 | sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */ | |
2155 | sx->outblock.cmd_count = 1; | |
2156 | } | |
2157 | else | |
2158 | #endif | |
2159 | { | |
2160 | #ifdef TCP_QUICKACK | |
2161 | (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, | |
2162 | sizeof(off)); | |
2163 | #endif | |
2164 | if (!smtp_reap_banner(sx)) | |
2165 | goto RESPONSE_FAILED; | |
2166 | } | |
2167 | ||
2168 | #ifndef DISABLE_EVENT | |
2169 | { | |
2170 | uschar * s; | |
2171 | lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes" | |
2172 | : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL; | |
2173 | s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer); | |
2174 | if (s) | |
2175 | { | |
2176 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, | |
2177 | string_sprintf("deferred by smtp:connect event expansion: %s", s), | |
2178 | DEFER, FALSE); | |
2179 | yield = DEFER; | |
2180 | goto SEND_QUIT; | |
2181 | } | |
2182 | } | |
2183 | #endif | |
2184 | ||
2185 | /* Now check if the helo_data expansion went well, and sign off cleanly if | |
420a0d19 CE |
2186 | it didn't. */ |
2187 | ||
2ea97746 | 2188 | if (!sx->helo_data) |
420a0d19 | 2189 | { |
2ea97746 | 2190 | message = string_sprintf("failed to expand helo_data: %s", |
420a0d19 | 2191 | expand_string_message); |
2ea97746 | 2192 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE); |
420a0d19 CE |
2193 | yield = DEFER; |
2194 | goto SEND_QUIT; | |
2195 | } | |
2196 | } | |
2197 | ||
2198 | /** Debugging without sending a message | |
2ea97746 | 2199 | sx->addrlist->transport_return = DEFER; |
420a0d19 CE |
2200 | goto SEND_QUIT; |
2201 | **/ | |
2202 | ||
2203 | /* Errors that occur after this point follow an SMTP command, which is | |
2204 | left in big_buffer by smtp_write_command() for use in error messages. */ | |
2205 | ||
2206 | smtp_command = big_buffer; | |
2207 | ||
2208 | /* Tell the remote who we are... | |
2209 | ||
2210 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the | |
2211 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the | |
2212 | greeting is of this form. The assumption was that the far end supports it | |
2213 | properly... but experience shows that there are some that give 5xx responses, | |
2214 | even though the banner includes "ESMTP" (there's a bloody-minded one that | |
2215 | says "ESMTP not spoken here"). Cope with that case. | |
2216 | ||
2217 | September 2000: Time has passed, and it seems reasonable now to always send | |
2218 | EHLO at the start. It is also convenient to make the change while installing | |
2219 | the TLS stuff. | |
2220 | ||
2221 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" | |
2222 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There | |
2223 | would be no way to send out the mails, so there is now a host list | |
2224 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the | |
2225 | PIPELINING problem as well. Maybe it can also be useful to cure other | |
2226 | problems with broken servers. | |
2227 | ||
2228 | Exim originally sent "Helo" at this point and ran for nearly a year that way. | |
2229 | Then somebody tried it with a Microsoft mailer... It seems that all other | |
2230 | mailers use upper case for some reason (the RFC is quite clear about case | |
2231 | independence) so, for peace of mind, I gave in. */ | |
2232 | ||
2ea97746 | 2233 | sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK; |
420a0d19 CE |
2234 | |
2235 | /* Alas; be careful, since this goto is not an error-out, so conceivably | |
2236 | we might set data between here and the target which we assume to exist | |
2237 | and be usable. I can see this coming back to bite us. */ | |
2ea97746 CE |
2238 | #ifdef SUPPORT_TLS |
2239 | if (sx->smtps) | |
420a0d19 | 2240 | { |
2ea97746 | 2241 | smtp_peer_options |= OPTION_TLS; |
420a0d19 CE |
2242 | suppress_tls = FALSE; |
2243 | ob->tls_tempfail_tryclear = FALSE; | |
2244 | smtp_command = US"SSL-on-connect"; | |
2245 | goto TLS_NEGOTIATE; | |
2246 | } | |
2ea97746 | 2247 | #endif |
420a0d19 | 2248 | |
2ea97746 | 2249 | if (sx->esmtp) |
420a0d19 | 2250 | { |
2ea97746 CE |
2251 | if (smtp_write_command(sx, |
2252 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2253 | sx->early_pipe_active ? SCMD_BUFFER : | |
2254 | #endif | |
2255 | SCMD_FLUSH, | |
2256 | "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0) | |
420a0d19 | 2257 | goto SEND_FAILED; |
2ea97746 CE |
2258 | sx->esmtp_sent = TRUE; |
2259 | ||
2260 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2261 | if (sx->early_pipe_active) | |
420a0d19 | 2262 | { |
2ea97746 CE |
2263 | sx->pending_EHLO = TRUE; |
2264 | ||
2265 | /* If we have too many authenticators to handle and might need to AUTH | |
2266 | for this transport, pipeline no further as we will need the | |
2267 | list of auth methods offered. Reap the banner and EHLO. */ | |
2268 | ||
2269 | if ( (ob->hosts_require_auth || ob->hosts_try_auth) | |
2270 | && f.smtp_in_early_pipe_no_auth) | |
2271 | { | |
2272 | DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n"); | |
2273 | if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0) | |
2274 | goto SEND_FAILED; | |
2275 | if (sync_responses(sx, 2, 0) != 0) | |
2276 | { | |
2277 | HDEBUG(D_transport) | |
2278 | debug_printf("failed reaping pipelined cmd responses\n"); | |
2279 | goto RESPONSE_FAILED; | |
2280 | } | |
2281 | sx->early_pipe_active = FALSE; | |
2282 | } | |
420a0d19 | 2283 | } |
2ea97746 CE |
2284 | else |
2285 | #endif | |
2286 | if (!smtp_reap_ehlo(sx)) | |
2287 | goto RESPONSE_FAILED; | |
420a0d19 CE |
2288 | } |
2289 | else | |
420a0d19 CE |
2290 | DEBUG(D_transport) |
2291 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
420a0d19 | 2292 | |
2ea97746 CE |
2293 | #ifdef EXPERIMENTAL_PIPE_CONNECT |
2294 | if (!sx->early_pipe_active) | |
2295 | #endif | |
2296 | if (!sx->esmtp) | |
2297 | { | |
2298 | BOOL good_response; | |
2299 | int n = sizeof(sx->buffer); | |
2300 | uschar * rsp = sx->buffer; | |
2301 | ||
2302 | if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2) | |
2303 | { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; } | |
2304 | ||
2305 | if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0) | |
2306 | goto SEND_FAILED; | |
2307 | good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout); | |
2308 | #ifdef EXPERIMENTAL_DSN_INFO | |
2309 | sx->helo_response = string_copy(rsp); | |
2310 | #endif | |
2311 | if (!good_response) | |
2312 | { | |
2313 | /* Handle special logging for a closed connection after HELO | |
2314 | when had previously sent EHLO */ | |
420a0d19 | 2315 | |
2ea97746 CE |
2316 | if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET)) |
2317 | { | |
2318 | errno = ERRNO_SMTPCLOSED; | |
2319 | goto EHLOHELO_FAILED; | |
2320 | } | |
2321 | memmove(sx->buffer, rsp, Ustrlen(rsp)); | |
2322 | goto RESPONSE_FAILED; | |
2323 | } | |
2324 | } | |
420a0d19 | 2325 | |
2ea97746 CE |
2326 | if (sx->esmtp || sx->lmtp) |
2327 | { | |
2328 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2329 | if (!sx->early_pipe_active) | |
2330 | #endif | |
2331 | { | |
2332 | sx->peer_offered = ehlo_response(sx->buffer, | |
2333 | OPTION_TLS /* others checked later */ | |
2334 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2335 | | (sx->early_pipe_ok | |
2336 | ? OPTION_IGNQ | |
2337 | | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE | |
2338 | #ifdef SUPPORT_I18N | |
2339 | | OPTION_UTF8 | |
2340 | #endif | |
2341 | | OPTION_EARLY_PIPE | |
2342 | : 0 | |
2343 | ) | |
2344 | #endif | |
2345 | ); | |
2346 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2347 | if (sx->early_pipe_ok) | |
2348 | { | |
2349 | sx->ehlo_resp.cleartext_features = sx->peer_offered; | |
2350 | ||
2351 | if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE)) | |
2352 | == (OPTION_PIPE | OPTION_EARLY_PIPE)) | |
2353 | { | |
2354 | DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n"); | |
2355 | sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx); | |
2356 | write_ehlo_cache_entry(sx); | |
2357 | } | |
2358 | } | |
2359 | #endif | |
2360 | } | |
420a0d19 CE |
2361 | |
2362 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ | |
2363 | ||
2ea97746 CE |
2364 | #ifdef SUPPORT_TLS |
2365 | smtp_peer_options |= sx->peer_offered & OPTION_TLS; | |
2366 | #endif | |
2367 | } | |
420a0d19 CE |
2368 | } |
2369 | ||
2ea97746 CE |
2370 | /* For continuing deliveries down the same channel, having re-exec'd the socket |
2371 | is the standard input; for a socket held open from verify it is recorded | |
2372 | in the cutthrough context block. Either way we don't need to redo EHLO here | |
2373 | (but may need to do so for TLS - see below). | |
2374 | Set up the pointer to where subsequent commands will be left, for | |
2375 | error messages. Note that smtp_peer_options will have been | |
420a0d19 CE |
2376 | set from the command line if they were set in the process that passed the |
2377 | connection on. */ | |
2378 | ||
2ea97746 CE |
2379 | /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c |
2380 | as the continue goes via transport_pass_socket() and doublefork and exec. | |
2381 | It does not wait. Unclear how we keep separate host's responses | |
2382 | separate - we could match up by host ip+port as a bodge. */ | |
2383 | ||
420a0d19 CE |
2384 | else |
2385 | { | |
2ea97746 CE |
2386 | if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only) |
2387 | { | |
2388 | sx->cctx = cutthrough.cctx; | |
2389 | sx->conn_args.host->port = sx->port = cutthrough.host.port; | |
2390 | } | |
2391 | else | |
2392 | { | |
2393 | sx->cctx.sock = 0; /* stdin */ | |
2394 | sx->cctx.tls_ctx = NULL; | |
2395 | smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */ | |
2396 | } | |
2397 | sx->inblock.cctx = sx->outblock.cctx = &sx->cctx; | |
420a0d19 | 2398 | smtp_command = big_buffer; |
2ea97746 CE |
2399 | sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */ |
2400 | ||
2401 | /* For a continued connection with TLS being proxied for us, or a | |
2402 | held-open verify connection with TLS, nothing more to do. */ | |
2403 | ||
2404 | if ( continue_proxy_cipher | |
2405 | || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only | |
2406 | && cutthrough.is_tls) | |
2407 | ) | |
2408 | { | |
2409 | sx->peer_offered = smtp_peer_options; | |
2410 | sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE); | |
2411 | HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n", | |
2412 | continue_proxy_cipher ? "proxied" : "verify conn with"); | |
2413 | return OK; | |
2414 | } | |
2415 | HDEBUG(D_transport) debug_printf("continued connection, no TLS\n"); | |
420a0d19 CE |
2416 | } |
2417 | ||
2418 | /* If TLS is available on this connection, whether continued or not, attempt to | |
2419 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, | |
2420 | send another EHLO - the server may give a different answer in secure mode. We | |
2421 | use a separate buffer for reading the response to STARTTLS so that if it is | |
2422 | negative, the original EHLO data is available for subsequent analysis, should | |
2423 | the client not be required to use TLS. If the response is bad, copy the buffer | |
2424 | for error analysis. */ | |
2425 | ||
2426 | #ifdef SUPPORT_TLS | |
2ea97746 CE |
2427 | if ( smtp_peer_options & OPTION_TLS |
2428 | && !suppress_tls | |
2429 | && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK | |
2430 | && ( !sx->verify | |
2431 | || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK | |
2432 | ) ) | |
420a0d19 CE |
2433 | { |
2434 | uschar buffer2[4096]; | |
2ea97746 CE |
2435 | |
2436 | if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0) | |
420a0d19 CE |
2437 | goto SEND_FAILED; |
2438 | ||
2ea97746 CE |
2439 | #ifdef EXPERIMENTAL_PIPE_CONNECT |
2440 | /* If doing early-pipelining reap the banner and EHLO-response but leave | |
2441 | the response for the STARTTLS we just sent alone. */ | |
2442 | ||
2443 | if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0) | |
2444 | { | |
2445 | HDEBUG(D_transport) | |
2446 | debug_printf("failed reaping pipelined cmd responses\n"); | |
2447 | goto RESPONSE_FAILED; | |
2448 | } | |
2449 | #endif | |
2450 | ||
420a0d19 CE |
2451 | /* If there is an I/O error, transmission of this message is deferred. If |
2452 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is | |
2453 | false, we also defer. However, if there is a temporary rejection of STARTTLS | |
2454 | and tls_tempfail_tryclear is true, or if there is an outright rejection of | |
2455 | STARTTLS, we carry on. This means we will try to send the message in clear, | |
2456 | unless the host is in hosts_require_tls (tested below). */ | |
2457 | ||
2ea97746 | 2458 | if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout)) |
420a0d19 | 2459 | { |
2ea97746 CE |
2460 | if ( errno != 0 |
2461 | || buffer2[0] == 0 | |
2462 | || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear) | |
2463 | ) | |
420a0d19 | 2464 | { |
2ea97746 CE |
2465 | Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer)); |
2466 | sx->buffer[sizeof(sx->buffer)-1] = '\0'; | |
420a0d19 CE |
2467 | goto RESPONSE_FAILED; |
2468 | } | |
2469 | } | |
2470 | ||
2471 | /* STARTTLS accepted: try to negotiate a TLS session. */ | |
2472 | ||
2473 | else | |
2474 | TLS_NEGOTIATE: | |
2475 | { | |
2ea97746 CE |
2476 | address_item * addr; |
2477 | uschar * errstr; | |
2478 | sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->conn_args.host, | |
2479 | sx->addrlist, sx->conn_args.tblock, | |
2480 | # ifdef SUPPORT_DANE | |
2481 | sx->dane ? &tlsa_dnsa : NULL, | |
2482 | # endif | |
2483 | &tls_out, &errstr); | |
420a0d19 | 2484 | |
2ea97746 | 2485 | if (!sx->cctx.tls_ctx) |
420a0d19 | 2486 | { |
2ea97746 CE |
2487 | /* TLS negotiation failed; give an error. From outside, this function may |
2488 | be called again to try in clear on a new connection, if the options permit | |
2489 | it for this host. */ | |
2490 | DEBUG(D_tls) debug_printf("TLS session fail: %s\n", errstr); | |
2491 | ||
2492 | # ifdef SUPPORT_DANE | |
2493 | if (sx->dane) | |
2494 | { | |
2495 | log_write(0, LOG_MAIN, | |
2496 | "DANE attempt failed; TLS connection to %s [%s]: %s", | |
2497 | sx->conn_args.host->name, sx->conn_args.host->address, errstr); | |
2498 | # ifndef DISABLE_EVENT | |
2499 | (void) event_raise(sx->conn_args.tblock->event_action, | |
2500 | US"dane:fail", US"validation-failure"); /* could do with better detail */ | |
2501 | # endif | |
2502 | } | |
2503 | # endif | |
2504 | ||
2505 | errno = ERRNO_TLSFAILURE; | |
2506 | message = string_sprintf("TLS session: %s", errstr); | |
2507 | sx->send_quit = FALSE; | |
420a0d19 CE |
2508 | goto TLS_FAILED; |
2509 | } | |
2510 | ||
2511 | /* TLS session is set up */ | |
2512 | ||
2ea97746 CE |
2513 | smtp_peer_options_wrap = smtp_peer_options; |
2514 | for (addr = sx->addrlist; addr; addr = addr->next) | |
420a0d19 CE |
2515 | if (addr->transport_return == PENDING_DEFER) |
2516 | { | |
2517 | addr->cipher = tls_out.cipher; | |
2518 | addr->ourcert = tls_out.ourcert; | |
2519 | addr->peercert = tls_out.peercert; | |
2520 | addr->peerdn = tls_out.peerdn; | |
2521 | addr->ocsp = tls_out.ocsp; | |
2522 | } | |
420a0d19 CE |
2523 | } |
2524 | } | |
2525 | ||
2526 | /* if smtps, we'll have smtp_command set to something else; always safe to | |
2527 | reset it here. */ | |
2528 | smtp_command = big_buffer; | |
2529 | ||
2530 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If | |
2531 | helo_data is null, we are dealing with a connection that was passed from | |
2532 | another process, and so we won't have expanded helo_data above. We have to | |
2533 | expand it here. $sending_ip_address and $sending_port are set up right at the | |
2534 | start of the Exim process (in exim.c). */ | |
2535 | ||
2ea97746 | 2536 | if (tls_out.active.sock >= 0) |
420a0d19 | 2537 | { |
2ea97746 CE |
2538 | uschar * greeting_cmd; |
2539 | ||
2540 | if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data))) | |
420a0d19 | 2541 | { |
2ea97746 CE |
2542 | uschar *message = string_sprintf("failed to expand helo_data: %s", |
2543 | expand_string_message); | |
2544 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE); | |
2545 | yield = DEFER; | |
2546 | goto SEND_QUIT; | |
420a0d19 CE |
2547 | } |
2548 | ||
2ea97746 CE |
2549 | #ifdef EXPERIMENTAL_PIPE_CONNECT |
2550 | /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit. | |
2551 | We're unlikely to get the group sent and delivered before the server sends its | |
2552 | banner, but it's still worth sending as a group. | |
2553 | For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not | |
2554 | the reverse. */ | |
2555 | ||
2556 | if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active) | |
420a0d19 | 2557 | { |
2ea97746 CE |
2558 | sx->peer_offered = sx->ehlo_resp.crypted_features; |
2559 | if ((sx->early_pipe_active = | |
2560 | !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE))) | |
2561 | DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n"); | |
420a0d19 | 2562 | } |
2ea97746 CE |
2563 | #endif |
2564 | ||
2565 | /* For SMTPS we need to wait for the initial OK response. */ | |
2566 | if (sx->smtps) | |
2567 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2568 | if (sx->early_pipe_active) | |
2569 | { | |
2570 | sx->pending_BANNER = TRUE; | |
2571 | sx->outblock.cmd_count = 1; | |
2572 | } | |
2573 | else | |
2574 | #endif | |
2575 | if (!smtp_reap_banner(sx)) | |
2576 | goto RESPONSE_FAILED; | |
420a0d19 | 2577 | |
2ea97746 CE |
2578 | if (sx->lmtp) |
2579 | greeting_cmd = US"LHLO"; | |
2580 | else if (sx->esmtp) | |
2581 | greeting_cmd = US"EHLO"; | |
420a0d19 CE |
2582 | else |
2583 | { | |
2ea97746 | 2584 | greeting_cmd = US"HELO"; |
420a0d19 CE |
2585 | DEBUG(D_transport) |
2586 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
2587 | } | |
2588 | ||
2ea97746 CE |
2589 | if (smtp_write_command(sx, |
2590 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2591 | sx->early_pipe_active ? SCMD_BUFFER : | |
2592 | #endif | |
2593 | SCMD_FLUSH, | |
2594 | "%s %s\r\n", greeting_cmd, sx->helo_data) < 0) | |
420a0d19 | 2595 | goto SEND_FAILED; |
2ea97746 CE |
2596 | |
2597 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2598 | if (sx->early_pipe_active) | |
2599 | sx->pending_EHLO = TRUE; | |
2600 | else | |
2601 | #endif | |
2602 | { | |
2603 | if (!smtp_reap_ehlo(sx)) | |
2604 | goto RESPONSE_FAILED; | |
2605 | smtp_peer_options = 0; | |
2606 | } | |
420a0d19 CE |
2607 | } |
2608 | ||
2609 | /* If the host is required to use a secure channel, ensure that we | |
2610 | have one. */ | |
2611 | ||
2ea97746 CE |
2612 | else if ( sx->smtps |
2613 | # ifdef SUPPORT_DANE | |
2614 | || sx->dane | |
2615 | # endif | |
2616 | # ifdef EXPERIMENTAL_REQUIRETLS | |
2617 | || tls_requiretls & REQUIRETLS_MSG | |
2618 | # endif | |
2619 | || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK | |
2620 | ) | |
420a0d19 | 2621 | { |
2ea97746 CE |
2622 | errno = |
2623 | # ifdef EXPERIMENTAL_REQUIRETLS | |
2624 | tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS : | |
2625 | # endif | |
2626 | ERRNO_TLSREQUIRED; | |
2627 | message = string_sprintf("a TLS session is required, but %s", | |
2628 | smtp_peer_options & OPTION_TLS | |
2629 | ? "an attempt to start TLS failed" : "the server did not offer TLS support"); | |
2630 | # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT) | |
2631 | if (sx->dane) | |
2632 | (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail", | |
2633 | smtp_peer_options & OPTION_TLS | |
2634 | ? US"validation-failure" /* could do with better detail */ | |
2635 | : US"starttls-not-supported"); | |
2636 | # endif | |
420a0d19 CE |
2637 | goto TLS_FAILED; |
2638 | } | |
2ea97746 | 2639 | #endif /*SUPPORT_TLS*/ |
420a0d19 CE |
2640 | |
2641 | /* If TLS is active, we have just started it up and re-done the EHLO command, | |
2642 | so its response needs to be analyzed. If TLS is not active and this is a | |
2643 | continued session down a previously-used socket, we haven't just done EHLO, so | |
2644 | we skip this. */ | |
2645 | ||
2646 | if (continue_hostname == NULL | |
2ea97746 CE |
2647 | #ifdef SUPPORT_TLS |
2648 | || tls_out.active.sock >= 0 | |
2649 | #endif | |
420a0d19 CE |
2650 | ) |
2651 | { | |
2ea97746 CE |
2652 | if (sx->esmtp || sx->lmtp) |
2653 | { | |
2654 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2655 | if (!sx->early_pipe_active) | |
2656 | #endif | |
2657 | { | |
2658 | sx->peer_offered = ehlo_response(sx->buffer, | |
2659 | 0 /* no TLS */ | |
2660 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2661 | | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0) | |
2662 | | OPTION_DSN | OPTION_PIPE | OPTION_SIZE | |
2663 | | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS | |
2664 | | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */ | |
2665 | ||
2666 | #else | |
2667 | ||
2668 | | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0) | |
2669 | | OPTION_CHUNKING | |
2670 | | OPTION_PRDR | |
2671 | # ifdef SUPPORT_I18N | |
2672 | | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0) | |
2673 | /*XXX if we hand peercaps on to continued-conn processes, | |
2674 | must not depend on this addr */ | |
2675 | # endif | |
2676 | | OPTION_DSN | |
2677 | | OPTION_PIPE | |
2678 | | (ob->size_addition >= 0 ? OPTION_SIZE : 0) | |
2679 | # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS) | |
2680 | | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0) | |
2681 | # endif | |
2682 | #endif | |
2683 | ); | |
2684 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
2685 | if (tls_out.active.sock >= 0) | |
2686 | sx->ehlo_resp.crypted_features = sx->peer_offered; | |
2687 | #endif | |
2688 | } | |
2689 | ||
2690 | /* Set for IGNOREQUOTA if the response to LHLO specifies support and the | |
2691 | lmtp_ignore_quota option was set. */ | |
420a0d19 | 2692 | |
2ea97746 | 2693 | sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US""; |
420a0d19 | 2694 | |
2ea97746 CE |
2695 | /* If the response to EHLO specified support for the SIZE parameter, note |
2696 | this, provided size_addition is non-negative. */ | |
420a0d19 | 2697 | |
2ea97746 | 2698 | smtp_peer_options |= sx->peer_offered & OPTION_SIZE; |
420a0d19 | 2699 | |
2ea97746 CE |
2700 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched |
2701 | the current host, esmtp will be false, so PIPELINING can never be used. If | |
2702 | the current host matches hosts_avoid_pipelining, don't do it. */ | |
420a0d19 | 2703 | |
2ea97746 CE |
2704 | if ( sx->peer_offered & OPTION_PIPE |
2705 | && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK) | |
2706 | smtp_peer_options |= OPTION_PIPE; | |
420a0d19 | 2707 | |
2ea97746 CE |
2708 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", |
2709 | smtp_peer_options & OPTION_PIPE ? "" : "not "); | |
2710 | ||
2711 | if ( sx->peer_offered & OPTION_CHUNKING | |
2712 | && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK) | |
2713 | sx->peer_offered &= ~OPTION_CHUNKING; | |
2714 | ||
2715 | if (sx->peer_offered & OPTION_CHUNKING) | |
2716 | DEBUG(D_transport) debug_printf("CHUNKING usable\n"); | |
420a0d19 CE |
2717 | |
2718 | #ifndef DISABLE_PRDR | |
2ea97746 CE |
2719 | if ( sx->peer_offered & OPTION_PRDR |
2720 | && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK) | |
2721 | sx->peer_offered &= ~OPTION_PRDR; | |
2722 | ||
2723 | if (sx->peer_offered & OPTION_PRDR) | |
2724 | DEBUG(D_transport) debug_printf("PRDR usable\n"); | |
2725 | #endif | |
2726 | ||
2727 | /* Note if the server supports DSN */ | |
2728 | smtp_peer_options |= sx->peer_offered & OPTION_DSN; | |
2729 | DEBUG(D_transport) debug_printf("%susing DSN\n", | |
2730 | sx->peer_offered & OPTION_DSN ? "" : "not "); | |
420a0d19 | 2731 | |
2ea97746 CE |
2732 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS) |
2733 | if (sx->peer_offered & OPTION_REQUIRETLS) | |
2734 | { | |
2735 | smtp_peer_options |= OPTION_REQUIRETLS; | |
2736 | DEBUG(D_transport) debug_printf( | |
2737 | tls_requiretls & REQUIRETLS_MSG | |
2738 | ? "using REQUIRETLS\n" : "REQUIRETLS offered\n"); | |
2739 | } | |
420a0d19 CE |
2740 | #endif |
2741 | ||
2ea97746 CE |
2742 | #ifdef EXPERIMENTAL_PIPE_CONNECT |
2743 | if ( sx->early_pipe_ok | |
2744 | && !sx->early_pipe_active | |
2745 | && tls_out.active.sock >= 0 | |
2746 | && smtp_peer_options & OPTION_PIPE | |
2747 | && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features) | |
2748 | & OPTION_EARLY_PIPE) | |
2749 | { | |
2750 | DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n"); | |
2751 | sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx); | |
2752 | write_ehlo_cache_entry(sx); | |
2753 | } | |
420a0d19 CE |
2754 | #endif |
2755 | ||
2ea97746 CE |
2756 | /* Note if the response to EHLO specifies support for the AUTH extension. |
2757 | If it has, check that this host is one we want to authenticate to, and do | |
2758 | the business. The host name and address must be available when the | |
2759 | authenticator's client driver is running. */ | |
420a0d19 | 2760 | |
2ea97746 CE |
2761 | switch (yield = smtp_auth(sx)) |
2762 | { | |
2763 | default: goto SEND_QUIT; | |
2764 | case OK: break; | |
2765 | case FAIL_SEND: goto SEND_FAILED; | |
2766 | case FAIL: goto RESPONSE_FAILED; | |
2767 | } | |
420a0d19 CE |
2768 | } |
2769 | } | |
2ea97746 | 2770 | sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE); |
420a0d19 CE |
2771 | |
2772 | /* The setting up of the SMTP call is now complete. Any subsequent errors are | |
2773 | message-specific. */ | |
2774 | ||
2ea97746 | 2775 | sx->setting_up = FALSE; |
420a0d19 | 2776 | |
2ea97746 CE |
2777 | #ifdef SUPPORT_I18N |
2778 | if (sx->addrlist->prop.utf8_msg) | |
420a0d19 | 2779 | { |
2ea97746 | 2780 | uschar * s; |
420a0d19 | 2781 | |
2ea97746 CE |
2782 | /* If the transport sets a downconversion mode it overrides any set by ACL |
2783 | for the message. */ | |
420a0d19 | 2784 | |
2ea97746 | 2785 | if ((s = ob->utf8_downconvert)) |
420a0d19 | 2786 | { |
2ea97746 CE |
2787 | if (!(s = expand_string(s))) |
2788 | { | |
2789 | message = string_sprintf("failed to expand utf8_downconvert: %s", | |
2790 | expand_string_message); | |
2791 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE); | |
2792 | yield = DEFER; | |
2793 | goto SEND_QUIT; | |
2794 | } | |
2795 | switch (*s) | |
2796 | { | |
2797 | case '1': sx->addrlist->prop.utf8_downcvt = TRUE; | |
2798 | sx->addrlist->prop.utf8_downcvt_maybe = FALSE; | |
2799 | break; | |
2800 | case '0': sx->addrlist->prop.utf8_downcvt = FALSE; | |
2801 | sx->addrlist->prop.utf8_downcvt_maybe = FALSE; | |
2802 | break; | |
2803 | case '-': if (s[1] == '1') | |
2804 | { | |
2805 | sx->addrlist->prop.utf8_downcvt = FALSE; | |
2806 | sx->addrlist->prop.utf8_downcvt_maybe = TRUE; | |
2807 | } | |
2808 | break; | |
2809 | } | |
420a0d19 | 2810 | } |
2ea97746 CE |
2811 | |
2812 | sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt | |
2813 | && !sx->addrlist->prop.utf8_downcvt_maybe; | |
2814 | DEBUG(D_transport) if (!sx->utf8_needed) | |
2815 | debug_printf("utf8: %s downconvert\n", | |
2816 | sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional"); | |
420a0d19 CE |
2817 | } |
2818 | ||
2ea97746 CE |
2819 | /* If this is an international message we need the host to speak SMTPUTF8 */ |
2820 | if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8)) | |
2821 | { | |
2822 | errno = ERRNO_UTF8_FWD; | |
2823 | goto RESPONSE_FAILED; | |
2824 | } | |
2825 | #endif /*SUPPORT_I18N*/ | |
420a0d19 | 2826 | |
2ea97746 CE |
2827 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS) |
2828 | /*XXX should tls_requiretls actually be per-addr? */ | |
420a0d19 | 2829 | |
2ea97746 CE |
2830 | if ( tls_requiretls & REQUIRETLS_MSG |
2831 | && !(sx->peer_offered & OPTION_REQUIRETLS) | |
2832 | ) | |
2833 | { | |
2834 | sx->setting_up = TRUE; | |
2835 | errno = ERRNO_REQUIRETLS; | |
2836 | message = US"REQUIRETLS support is required from the server" | |
2837 | " but it was not offered"; | |
2838 | DEBUG(D_transport) debug_printf("%s\n", message); | |
2839 | goto TLS_FAILED; | |
2840 | } | |
2841 | #endif | |
2842 | ||
2843 | return OK; | |
2844 | ||
2845 | ||
2846 | { | |
2847 | int code; | |
2848 | ||
2849 | RESPONSE_FAILED: | |
2850 | message = NULL; | |
2851 | sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno, | |
2852 | sx->buffer, &code, &message, &pass_message); | |
2853 | yield = DEFER; | |
2854 | goto FAILED; | |
2855 | ||
2856 | SEND_FAILED: | |
2857 | code = '4'; | |
2858 | message = US string_sprintf("send() to %s [%s] failed: %s", | |
2859 | sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno)); | |
2860 | sx->send_quit = FALSE; | |
2861 | yield = DEFER; | |
2862 | goto FAILED; | |
2863 | ||
2864 | EHLOHELO_FAILED: | |
2865 | code = '4'; | |
2866 | message = string_sprintf("Remote host closed connection in response to %s" | |
2867 | " (EHLO response was: %s)", smtp_command, sx->buffer); | |
2868 | sx->send_quit = FALSE; | |
2869 | yield = DEFER; | |
2870 | goto FAILED; | |
2871 | ||
2872 | /* This label is jumped to directly when a TLS negotiation has failed, | |
2873 | or was not done for a host for which it is required. Values will be set | |
2874 | in message and errno, and setting_up will always be true. Treat as | |
2875 | a temporary error. */ | |
2876 | ||
2877 | #ifdef SUPPORT_TLS | |
2878 | TLS_FAILED: | |
2879 | # ifdef EXPERIMENTAL_REQUIRETLS | |
2880 | if (errno == ERRNO_REQUIRETLS) | |
2881 | code = '5', yield = FAIL; | |
2882 | /*XXX DSN will be labelled 500; prefer 530 5.7.4 */ | |
2883 | else | |
2884 | # endif | |
2885 | code = '4', yield = DEFER; | |
2886 | goto FAILED; | |
2887 | #endif | |
2888 | ||
2889 | /* The failure happened while setting up the call; see if the failure was | |
2890 | a 5xx response (this will either be on connection, or following HELO - a 5xx | |
2891 | after EHLO causes it to try HELO). If so, and there are no more hosts to try, | |
2892 | fail all addresses, as this host is never going to accept them. For other | |
2893 | errors during setting up (timeouts or whatever), defer all addresses, and | |
2894 | yield DEFER, so that the host is not tried again for a while. | |
2895 | ||
2896 | XXX This peeking for another host feels like a layering violation. We want | |
2897 | to note the host as unusable, but down here we shouldn't know if this was | |
2898 | the last host to try for the addr(list). Perhaps the upper layer should be | |
2899 | the one to do set_errno() ? The problem is that currently the addr is where | |
2900 | errno etc. are stashed, but until we run out of hosts to try the errors are | |
2901 | host-specific. Maybe we should enhance the host_item definition? */ | |
2902 | ||
2903 | FAILED: | |
2904 | sx->ok = FALSE; /* For when reached by GOTO */ | |
2905 | set_errno(sx->addrlist, errno, message, | |
2906 | sx->conn_args.host->next | |
2907 | ? DEFER | |
2908 | : code == '5' | |
2909 | #ifdef SUPPORT_I18N | |
2910 | || errno == ERRNO_UTF8_FWD | |
2911 | #endif | |
2912 | ? FAIL : DEFER, | |
2913 | pass_message, sx->conn_args.host | |
2914 | #ifdef EXPERIMENTAL_DSN_INFO | |
2915 | , sx->smtp_greeting, sx->helo_response | |
2916 | #endif | |
2917 | ); | |
2918 | } | |
2919 | ||
2920 | ||
2921 | SEND_QUIT: | |
2922 | ||
2923 | if (sx->send_quit) | |
2924 | (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n"); | |
2925 | ||
2926 | #ifdef SUPPORT_TLS | |
2927 | if (sx->cctx.tls_ctx) | |
2928 | { | |
2929 | tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT); | |
2930 | sx->cctx.tls_ctx = NULL; | |
2931 | } | |
2932 | #endif | |
2933 | ||
2934 | /* Close the socket, and return the appropriate value, first setting | |
2935 | works because the NULL setting is passed back to the calling process, and | |
2936 | remote_max_parallel is forced to 1 when delivering over an existing connection, | |
2937 | */ | |
2938 | ||
2939 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); | |
2940 | if (sx->send_quit) | |
2941 | { | |
2942 | shutdown(sx->cctx.sock, SHUT_WR); | |
2943 | if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0) | |
2944 | for (rc = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;) | |
2945 | rc--; /* drain socket */ | |
2946 | sx->send_quit = FALSE; | |
2947 | } | |
2948 | (void)close(sx->cctx.sock); | |
2949 | sx->cctx.sock = -1; | |
2950 | ||
2951 | #ifndef DISABLE_EVENT | |
2952 | (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL); | |
2953 | #endif | |
2954 | ||
2955 | continue_transport = NULL; | |
2956 | continue_hostname = NULL; | |
2957 | return yield; | |
2958 | } | |
2959 | ||
2960 | ||
2961 | ||
2962 | ||
2963 | /* Create the string of options that will be appended to the MAIL FROM: | |
2964 | in the connection context buffer */ | |
2965 | ||
2966 | static int | |
2967 | build_mailcmd_options(smtp_context * sx, address_item * addrlist) | |
2968 | { | |
2969 | uschar * p = sx->buffer; | |
2970 | address_item * addr; | |
2971 | int address_count; | |
420a0d19 | 2972 | |
2ea97746 | 2973 | *p = 0; |
420a0d19 | 2974 | |
2ea97746 CE |
2975 | /* If we know the receiving MTA supports the SIZE qualification, and we know it, |
2976 | send it, adding something to the message size to allow for imprecision | |
2977 | and things that get added en route. Exim keeps the number of lines | |
420a0d19 CE |
2978 | in a message, so we can give an accurate value for the original message, but we |
2979 | need some additional to handle added headers. (Double "." characters don't get | |
2980 | included in the count.) */ | |
2981 | ||
2ea97746 CE |
2982 | if ( message_size > 0 |
2983 | && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE)) | |
420a0d19 | 2984 | { |
2ea97746 CE |
2985 | /*XXX problem here under spool_files_wireformat? |
2986 | Or just forget about lines? Or inflate by a fixed proportion? */ | |
2987 | ||
2988 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition); | |
420a0d19 CE |
2989 | while (*p) p++; |
2990 | } | |
2991 | ||
2992 | #ifndef DISABLE_PRDR | |
2ea97746 CE |
2993 | /* If it supports Per-Recipient Data Responses, and we have more than one recipient, |
2994 | request that */ | |
2995 | ||
2996 | sx->prdr_active = FALSE; | |
2997 | if (sx->peer_offered & OPTION_PRDR) | |
2998 | for (addr = addrlist; addr; addr = addr->next) | |
420a0d19 CE |
2999 | if (addr->transport_return == PENDING_DEFER) |
3000 | { | |
3001 | for (addr = addr->next; addr; addr = addr->next) | |
3002 | if (addr->transport_return == PENDING_DEFER) | |
3003 | { /* at least two recipients to send */ | |
2ea97746 | 3004 | sx->prdr_active = TRUE; |
420a0d19 | 3005 | sprintf(CS p, " PRDR"); p += 5; |
2ea97746 | 3006 | break; |
420a0d19 CE |
3007 | } |
3008 | break; | |
3009 | } | |
420a0d19 CE |
3010 | #endif |
3011 | ||
2ea97746 CE |
3012 | #ifdef SUPPORT_I18N |
3013 | /* If it supports internationalised messages, and this meesage need that, | |
3014 | request it */ | |
420a0d19 | 3015 | |
2ea97746 CE |
3016 | if ( sx->peer_offered & OPTION_UTF8 |
3017 | && addrlist->prop.utf8_msg | |
3018 | && !addrlist->prop.utf8_downcvt | |
3019 | ) | |
3020 | Ustrcpy(p, " SMTPUTF8"), p += 9; | |
3021 | #endif | |
420a0d19 | 3022 | |
2ea97746 CE |
3023 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS) |
3024 | if (tls_requiretls & REQUIRETLS_MSG) | |
3025 | Ustrcpy(p, " REQUIRETLS") , p += 11; | |
3026 | #endif | |
3027 | ||
3028 | /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */ | |
3029 | for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0; | |
3030 | addr && address_count < sx->max_rcpt; | |
3031 | addr = addr->next) if (addr->transport_return == PENDING_DEFER) | |
420a0d19 | 3032 | { |
2ea97746 CE |
3033 | address_count++; |
3034 | if (!(addr->dsn_flags & rf_dsnlasthop)) | |
420a0d19 | 3035 | { |
2ea97746 CE |
3036 | sx->dsn_all_lasthop = FALSE; |
3037 | break; | |
420a0d19 | 3038 | } |
2ea97746 CE |
3039 | } |
3040 | ||
3041 | /* Add any DSN flags to the mail command */ | |
3042 | ||
3043 | if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop) | |
3044 | { | |
3045 | if (dsn_ret == dsn_ret_hdrs) | |
3046 | { Ustrcpy(p, " RET=HDRS"); p += 9; } | |
420a0d19 | 3047 | else if (dsn_ret == dsn_ret_full) |
2ea97746 CE |
3048 | { Ustrcpy(p, " RET=FULL"); p += 9; } |
3049 | ||
3050 | if (dsn_envid) | |
420a0d19 | 3051 | { |
2ea97746 | 3052 | string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid); |
420a0d19 CE |
3053 | while (*p) p++; |
3054 | } | |
3055 | } | |
420a0d19 CE |
3056 | |
3057 | /* If an authenticated_sender override has been specified for this transport | |
3058 | instance, expand it. If the expansion is forced to fail, and there was already | |
3059 | an authenticated_sender for this message, the original value will be used. | |
3060 | Other expansion failures are serious. An empty result is ignored, but there is | |
3061 | otherwise no check - this feature is expected to be used with LMTP and other | |
3062 | cases where non-standard addresses (e.g. without domains) might be required. */ | |
3063 | ||
2ea97746 CE |
3064 | if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob)) |
3065 | return ERROR; | |
3066 | ||
3067 | return OK; | |
3068 | } | |
3069 | ||
3070 | ||
3071 | static void | |
3072 | build_rcptcmd_options(smtp_context * sx, const address_item * addr) | |
3073 | { | |
3074 | uschar * p = sx->buffer; | |
3075 | *p = 0; | |
3076 | ||
3077 | /* Add any DSN flags to the rcpt command */ | |
3078 | ||
3079 | if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop)) | |
3080 | { | |
3081 | if (addr->dsn_flags & rf_dsnflags) | |
3082 | { | |
3083 | int i; | |
3084 | BOOL first = TRUE; | |
3085 | ||
3086 | Ustrcpy(p, " NOTIFY="); | |
3087 | while (*p) p++; | |
3088 | for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i]) | |
3089 | { | |
3090 | if (!first) *p++ = ','; | |
3091 | first = FALSE; | |
3092 | Ustrcpy(p, rf_names[i]); | |
3093 | while (*p) p++; | |
3094 | } | |
3095 | } | |
3096 | ||
3097 | if (addr->dsn_orcpt) | |
3098 | { | |
3099 | string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s", | |
3100 | addr->dsn_orcpt); | |
3101 | while (*p) p++; | |
3102 | } | |
3103 | } | |
3104 | } | |
3105 | ||
3106 | ||
3107 | ||
3108 | /* | |
3109 | Return: | |
3110 | 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL) | |
3111 | -1 MAIL response error | |
3112 | -2 any non-MAIL read i/o error | |
3113 | -3 non-MAIL response timeout | |
3114 | -4 internal error; channel still usable | |
3115 | -5 transmit failed | |
3116 | */ | |
3117 | ||
3118 | int | |
3119 | smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield) | |
3120 | { | |
3121 | address_item * addr; | |
3122 | int address_count; | |
3123 | int rc; | |
3124 | ||
3125 | if (build_mailcmd_options(sx, sx->first_addr) != OK) | |
3126 | { | |
3127 | *yield = ERROR; | |
3128 | return -4; | |
3129 | } | |
420a0d19 CE |
3130 | |
3131 | /* From here until we send the DATA command, we can make use of PIPELINING | |
3132 | if the server host supports it. The code has to be able to check the responses | |
3133 | at any point, for when the buffer fills up, so we write it totally generally. | |
3134 | When PIPELINING is off, each command written reports that it has flushed the | |
3135 | buffer. */ | |
3136 | ||
2ea97746 CE |
3137 | sx->pending_MAIL = TRUE; /* The block starts with MAIL */ |
3138 | ||
3139 | { | |
3140 | uschar * s = sx->from_addr; | |
3141 | #ifdef SUPPORT_I18N | |
3142 | uschar * errstr = NULL; | |
3143 | ||
3144 | /* If we must downconvert, do the from-address here. Remember we had to | |
3145 | for the to-addresses (done below), and also (ugly) for re-doing when building | |
3146 | the delivery log line. */ | |
3147 | ||
3148 | if ( sx->addrlist->prop.utf8_msg | |
3149 | && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8)) | |
3150 | ) | |
3151 | { | |
3152 | if (s = string_address_utf8_to_alabel(s, &errstr), errstr) | |
3153 | { | |
3154 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE); | |
3155 | *yield = ERROR; | |
3156 | return -4; | |
3157 | } | |
3158 | setflag(sx->addrlist, af_utf8_downcvt); | |
3159 | } | |
3160 | #endif | |
3161 | ||
3162 | rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH, | |
3163 | "MAIL FROM:<%s>%s\r\n", s, sx->buffer); | |
3164 | } | |
420a0d19 | 3165 | |
420a0d19 CE |
3166 | mail_command = string_copy(big_buffer); /* Save for later error message */ |
3167 | ||
3168 | switch(rc) | |
3169 | { | |
3170 | case -1: /* Transmission error */ | |
2ea97746 | 3171 | return -5; |
420a0d19 | 3172 | |
2ea97746 CE |
3173 | case +1: /* Cmd was sent */ |
3174 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', | |
3175 | (SOB sx->conn_args.ob)->command_timeout)) | |
420a0d19 | 3176 | { |
2ea97746 CE |
3177 | if (errno == 0 && sx->buffer[0] == '4') |
3178 | { | |
3179 | errno = ERRNO_MAIL4XX; | |
3180 | sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; | |
3181 | } | |
3182 | return -1; | |
420a0d19 | 3183 | } |
2ea97746 CE |
3184 | sx->pending_MAIL = FALSE; |
3185 | break; | |
3186 | ||
3187 | /* otherwise zero: command queued for pipeline */ | |
420a0d19 CE |
3188 | } |
3189 | ||
3190 | /* Pass over all the relevant recipient addresses for this host, which are the | |
3191 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send | |
3192 | several before we have to read the responses for those seen so far. This | |
3193 | checking is done by a subroutine because it also needs to be done at the end. | |
2ea97746 | 3194 | Send only up to max_rcpt addresses at a time, leaving next_addr pointing to |
420a0d19 CE |
3195 | the next one if not all are sent. |
3196 | ||
3197 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the | |
3198 | last address because we want to abort if any recipients have any kind of | |
3199 | problem, temporary or permanent. We know that all recipient addresses will have | |
3200 | the PENDING_DEFER status, because only one attempt is ever made, and we know | |
2ea97746 CE |
3201 | that max_rcpt will be large, so all addresses will be done at once. |
3202 | ||
3203 | For verify we flush the pipeline after any (the only) rcpt address. */ | |
420a0d19 | 3204 | |
2ea97746 CE |
3205 | for (addr = sx->first_addr, address_count = 0; |
3206 | addr && address_count < sx->max_rcpt; | |
3207 | addr = addr->next) if (addr->transport_return == PENDING_DEFER) | |
420a0d19 CE |
3208 | { |
3209 | int count; | |
3210 | BOOL no_flush; | |
2ea97746 | 3211 | uschar * rcpt_addr; |
420a0d19 | 3212 | |
2ea97746 CE |
3213 | addr->dsn_aware = sx->peer_offered & OPTION_DSN |
3214 | ? dsn_support_yes : dsn_support_no; | |
420a0d19 CE |
3215 | |
3216 | address_count++; | |
2ea97746 CE |
3217 | no_flush = pipelining_active && !sx->verify |
3218 | && (!mua_wrapper || addr->next && address_count < sx->max_rcpt); | |
3219 | ||
3220 | build_rcptcmd_options(sx, addr); | |
3221 | ||
3222 | /* Now send the RCPT command, and process outstanding responses when | |
3223 | necessary. After a timeout on RCPT, we just end the function, leaving the | |
3224 | yield as OK, because this error can often mean that there is a problem with | |
3225 | just one address, so we don't want to delay the host. */ | |
3226 | ||
3227 | rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes); | |
3228 | ||
3229 | #ifdef SUPPORT_I18N | |
3230 | if ( testflag(sx->addrlist, af_utf8_downcvt) | |
3231 | && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL)) | |
3232 | ) | |
3233 | { | |
3234 | /*XXX could we use a per-address errstr here? Not fail the whole send? */ | |
3235 | errno = ERRNO_EXPANDFAIL; | |
3236 | return -5; /*XXX too harsh? */ | |
3237 | } | |
3238 | #endif | |
3239 | ||
3240 | count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH, | |
3241 | "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer); | |
3242 | ||
3243 | if (count < 0) return -5; | |
3244 | if (count > 0) | |
3245 | { | |
3246 | switch(sync_responses(sx, count, 0)) | |
3247 | { | |
3248 | case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
3249 | case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */ | |
3250 | break; | |
3251 | ||
3252 | case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
3253 | if (!sx->lmtp) /* can't tell about progress yet */ | |
3254 | sx->completed_addr = TRUE; | |
3255 | case 0: /* No 2xx or 5xx, but no probs */ | |
3256 | break; | |
3257 | ||
3258 | case -1: return -3; /* Timeout on RCPT */ | |
3259 | case -2: return -2; /* non-MAIL read i/o error */ | |
3260 | default: return -1; /* any MAIL error */ | |
3261 | ||
3262 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
3263 | case -4: return -1; /* non-2xx for pipelined banner or EHLO */ | |
3264 | #endif | |
3265 | } | |
3266 | sx->pending_MAIL = FALSE; /* Dealt with MAIL */ | |
3267 | } | |
3268 | } /* Loop for next address */ | |
3269 | ||
3270 | sx->next_addr = addr; | |
3271 | return 0; | |
3272 | } | |
3273 | ||
420a0d19 | 3274 | |
2ea97746 CE |
3275 | #ifdef SUPPORT_TLS |
3276 | /***************************************************** | |
3277 | * Proxy TLS connection for another transport process * | |
3278 | ******************************************************/ | |
3279 | /* | |
3280 | Close the unused end of the pipe, fork once more, then use the given buffer | |
3281 | as a staging area, and select on both the given fd and the TLS'd client-fd for | |
3282 | data to read (per the coding in ip_recv() and fd_ready() this is legitimate). | |
3283 | Do blocking full-size writes, and reads under a timeout. Once both input | |
3284 | channels are closed, exit the process. | |
3285 | ||
3286 | Arguments: | |
3287 | ct_ctx tls context | |
3288 | buf space to use for buffering | |
3289 | bufsiz size of buffer | |
3290 | pfd pipe filedescriptor array; [0] is comms to proxied process | |
3291 | timeout per-read timeout, seconds | |
3292 | */ | |
3293 | ||
3294 | void | |
3295 | smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd, | |
3296 | int timeout) | |
3297 | { | |
3298 | fd_set rfds, efds; | |
3299 | int max_fd = MAX(pfd[0], tls_out.active.sock) + 1; | |
3300 | int rc, i, fd_bits, nbytes; | |
3301 | ||
3302 | close(pfd[1]); | |
3303 | if ((rc = fork())) | |
3304 | { | |
3305 | DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc); | |
3306 | _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS); | |
3307 | } | |
3308 | ||
3309 | if (f.running_in_test_harness) millisleep(100); /* let parent debug out */ | |
3310 | set_process_info("proxying TLS connection for continued transport"); | |
3311 | FD_ZERO(&rfds); | |
3312 | FD_SET(tls_out.active.sock, &rfds); | |
3313 | FD_SET(pfd[0], &rfds); | |
3314 | ||
3315 | for (fd_bits = 3; fd_bits; ) | |
3316 | { | |
3317 | time_t time_left = timeout; | |
3318 | time_t time_start = time(NULL); | |
3319 | ||
3320 | /* wait for data */ | |
3321 | efds = rfds; | |
3322 | do | |
3323 | { | |
3324 | struct timeval tv = { time_left, 0 }; | |
3325 | ||
3326 | rc = select(max_fd, | |
3327 | (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv); | |
3328 | ||
3329 | if (rc < 0 && errno == EINTR) | |
3330 | if ((time_left -= time(NULL) - time_start) > 0) continue; | |
3331 | ||
3332 | if (rc <= 0) | |
3333 | { | |
3334 | DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__); | |
3335 | goto done; | |
3336 | } | |
3337 | ||
3338 | if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds)) | |
3339 | { | |
3340 | DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n", | |
3341 | FD_ISSET(pfd[0], &efds) ? "proxy" : "tls"); | |
3342 | goto done; | |
3343 | } | |
3344 | } | |
3345 | while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds))); | |
3346 | ||
3347 | /* handle inbound data */ | |
3348 | if (FD_ISSET(tls_out.active.sock, &rfds)) | |
3349 | if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) | |
3350 | { | |
3351 | fd_bits &= ~1; | |
3352 | FD_CLR(tls_out.active.sock, &rfds); | |
3353 | shutdown(pfd[0], SHUT_WR); | |
3354 | timeout = 5; | |
3355 | } | |
3356 | else | |
3357 | { | |
3358 | for (nbytes = 0; rc - nbytes > 0; nbytes += i) | |
3359 | if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done; | |
3360 | } | |
3361 | else if (fd_bits & 1) | |
3362 | FD_SET(tls_out.active.sock, &rfds); | |
3363 | ||
3364 | /* handle outbound data */ | |
3365 | if (FD_ISSET(pfd[0], &rfds)) | |
3366 | if ((rc = read(pfd[0], buf, bsize)) <= 0) | |
3367 | { | |
3368 | fd_bits = 0; | |
3369 | tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT); | |
3370 | ct_ctx = NULL; | |
3371 | } | |
3372 | else | |
3373 | { | |
3374 | for (nbytes = 0; rc - nbytes > 0; nbytes += i) | |
3375 | if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0) | |
3376 | goto done; | |
3377 | } | |
3378 | else if (fd_bits & 2) | |
3379 | FD_SET(pfd[0], &rfds); | |
3380 | } | |
3381 | ||
3382 | done: | |
3383 | if (f.running_in_test_harness) millisleep(100); /* let logging complete */ | |
3384 | exim_exit(0, US"TLS proxy"); | |
3385 | } | |
3386 | #endif | |
3387 | ||
3388 | ||
3389 | /************************************************* | |
3390 | * Deliver address list to given host * | |
3391 | *************************************************/ | |
3392 | ||
3393 | /* If continue_hostname is not null, we get here only when continuing to | |
3394 | deliver down an existing channel. The channel was passed as the standard | |
3395 | input. TLS is never active on a passed channel; the previous process always | |
3396 | closes it down before passing the connection on. | |
3397 | ||
3398 | Otherwise, we have to make a connection to the remote host, and do the | |
3399 | initial protocol exchange. | |
3400 | ||
3401 | When running as an MUA wrapper, if the sender or any recipient is rejected, | |
3402 | temporarily or permanently, we force failure for all recipients. | |
3403 | ||
3404 | Arguments: | |
3405 | addrlist chain of potential addresses to deliver; only those whose | |
3406 | transport_return field is set to PENDING_DEFER are currently | |
3407 | being processed; others should be skipped - they have either | |
3408 | been delivered to an earlier host or IP address, or been | |
3409 | failed by one of them. | |
3410 | host host to deliver to | |
3411 | host_af AF_INET or AF_INET6 | |
3412 | defport default TCP/IP port to use if host does not specify, in host | |
3413 | byte order | |
3414 | interface interface to bind to, or NULL | |
3415 | tblock transport instance block | |
3416 | message_defer set TRUE if yield is OK, but all addresses were deferred | |
3417 | because of a non-recipient, non-host failure, that is, a | |
3418 | 4xx response to MAIL FROM, DATA, or ".". This is a defer | |
3419 | that is specific to the message. | |
3420 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for | |
3421 | a second attempt after TLS initialization fails | |
3422 | ||
3423 | Returns: OK - the connection was made and the delivery attempted; | |
3424 | the result for each address is in its data block. | |
3425 | DEFER - the connection could not be made, or something failed | |
3426 | while setting up the SMTP session, or there was a | |
3427 | non-message-specific error, such as a timeout. | |
3428 | ERROR - a filter command is specified for this transport, | |
3429 | and there was a problem setting it up; OR helo_data | |
3430 | or add_headers or authenticated_sender is specified | |
3431 | for this transport, and the string failed to expand | |
3432 | */ | |
3433 | ||
3434 | static int | |
3435 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport, | |
3436 | uschar *interface, transport_instance *tblock, | |
3437 | BOOL *message_defer, BOOL suppress_tls) | |
3438 | { | |
3439 | address_item *addr; | |
3440 | smtp_transport_options_block * ob = SOB tblock->options_block; | |
3441 | int yield = OK; | |
3442 | int save_errno; | |
3443 | int rc; | |
3444 | struct timeval start_delivery_time; | |
3445 | ||
3446 | BOOL pass_message = FALSE; | |
3447 | uschar *message = NULL; | |
3448 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; | |
3449 | ||
3450 | smtp_context sx; | |
3451 | ||
3452 | gettimeofday(&start_delivery_time, NULL); | |
3453 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ | |
3454 | *message_defer = FALSE; | |
3455 | ||
3456 | sx.addrlist = addrlist; | |
3457 | sx.conn_args.host = host; | |
3458 | sx.conn_args.host_af = host_af, | |
3459 | sx.port = defport; | |
3460 | sx.conn_args.interface = interface; | |
3461 | sx.helo_data = NULL; | |
3462 | sx.conn_args.tblock = tblock; | |
3463 | sx.verify = FALSE; | |
3464 | sx.sync_addr = sx.first_addr = addrlist; | |
3465 | ||
3466 | /* Get the channel set up ready for a message (MAIL FROM being the next | |
3467 | SMTP command to send */ | |
3468 | ||
3469 | if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK) | |
3470 | return rc; | |
3471 | ||
3472 | /* If there is a filter command specified for this transport, we can now | |
3473 | set it up. This cannot be done until the identify of the host is known. */ | |
3474 | ||
3475 | if (tblock->filter_command) | |
3476 | { | |
3477 | transport_filter_timeout = tblock->filter_timeout; | |
420a0d19 | 3478 | |
2ea97746 CE |
3479 | /* On failure, copy the error to all addresses, abandon the SMTP call, and |
3480 | yield ERROR. */ | |
420a0d19 | 3481 | |
2ea97746 CE |
3482 | if (!transport_set_up_command(&transport_filter_argv, |
3483 | tblock->filter_command, TRUE, DEFER, addrlist, | |
3484 | string_sprintf("%.50s transport", tblock->name), NULL)) | |
420a0d19 | 3485 | { |
2ea97746 CE |
3486 | set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER, |
3487 | FALSE); | |
3488 | yield = ERROR; | |
3489 | goto SEND_QUIT; | |
420a0d19 | 3490 | } |
420a0d19 | 3491 | |
2ea97746 CE |
3492 | if ( transport_filter_argv |
3493 | && *transport_filter_argv | |
3494 | && **transport_filter_argv | |
3495 | && sx.peer_offered & OPTION_CHUNKING | |
3496 | ) | |
3497 | { | |
3498 | sx.peer_offered &= ~OPTION_CHUNKING; | |
3499 | DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n"); | |
3500 | } | |
3501 | } | |
420a0d19 | 3502 | |
2ea97746 CE |
3503 | /* For messages that have more than the maximum number of envelope recipients, |
3504 | we want to send several transactions down the same SMTP connection. (See | |
3505 | comments in deliver.c as to how this reconciles, heuristically, with | |
3506 | remote_max_parallel.) This optimization was added to Exim after the following | |
3507 | code was already working. The simplest way to put it in without disturbing the | |
3508 | code was to use a goto to jump back to this point when there is another | |
3509 | transaction to handle. */ | |
420a0d19 | 3510 | |
2ea97746 CE |
3511 | SEND_MESSAGE: |
3512 | sx.from_addr = return_path; | |
3513 | sx.sync_addr = sx.first_addr; | |
3514 | sx.ok = FALSE; | |
3515 | sx.send_rset = TRUE; | |
3516 | sx.completed_addr = FALSE; | |
420a0d19 | 3517 | |
420a0d19 | 3518 | |
2ea97746 CE |
3519 | /* If we are a continued-connection-after-verify the MAIL and RCPT |
3520 | commands were already sent; do not re-send but do mark the addrs as | |
3521 | having been accepted up to RCPT stage. A traditional cont-conn | |
3522 | always has a sequence number greater than one. */ | |
420a0d19 | 3523 | |
2ea97746 CE |
3524 | if (continue_hostname && continue_sequence == 1) |
3525 | { | |
3526 | address_item * addr; | |
420a0d19 | 3527 | |
2ea97746 CE |
3528 | sx.peer_offered = smtp_peer_options; |
3529 | sx.pending_MAIL = FALSE; | |
3530 | sx.ok = TRUE; | |
3531 | sx.next_addr = NULL; | |
420a0d19 | 3532 | |
2ea97746 CE |
3533 | for (addr = addrlist; addr; addr = addr->next) |
3534 | addr->transport_return = PENDING_OK; | |
3535 | } | |
3536 | else | |
420a0d19 | 3537 | { |
2ea97746 CE |
3538 | /* Initiate a message transfer. */ |
3539 | ||
3540 | switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield)) | |
420a0d19 | 3541 | { |
2ea97746 CE |
3542 | case 0: break; |
3543 | case -1: case -2: goto RESPONSE_FAILED; | |
3544 | case -3: goto END_OFF; | |
3545 | case -4: goto SEND_QUIT; | |
3546 | default: goto SEND_FAILED; | |
420a0d19 | 3547 | } |
2ea97746 CE |
3548 | |
3549 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either | |
3550 | permanently or temporarily. We should have flushed and synced after the last | |
3551 | RCPT. */ | |
3552 | ||
3553 | if (mua_wrapper) | |
420a0d19 | 3554 | { |
2ea97746 CE |
3555 | address_item * a; |
3556 | unsigned cnt; | |
3557 | ||
3558 | for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++) | |
3559 | if (a->transport_return != PENDING_OK) | |
3560 | { | |
3561 | /*XXX could we find a better errno than 0 here? */ | |
3562 | set_errno_nohost(addrlist, 0, a->message, FAIL, | |
3563 | testflag(a, af_pass_message)); | |
3564 | sx.ok = FALSE; | |
3565 | break; | |
3566 | } | |
420a0d19 CE |
3567 | } |
3568 | } | |
3569 | ||
3570 | /* If ok is TRUE, we know we have got at least one good recipient, and must now | |
3571 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still | |
3572 | have a good recipient buffered up if we are pipelining. We don't want to waste | |
3573 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we | |
2ea97746 CE |
3574 | are pipelining. The responses are all handled by sync_responses(). |
3575 | If using CHUNKING, do not send a BDAT until we know how big a chunk we want | |
3576 | to send is. */ | |
420a0d19 | 3577 | |
2ea97746 CE |
3578 | if ( !(sx.peer_offered & OPTION_CHUNKING) |
3579 | && (sx.ok || (pipelining_active && !mua_wrapper))) | |
420a0d19 | 3580 | { |
2ea97746 CE |
3581 | int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n"); |
3582 | ||
420a0d19 | 3583 | if (count < 0) goto SEND_FAILED; |
2ea97746 | 3584 | switch(sync_responses(&sx, count, sx.ok ? +1 : -1)) |
420a0d19 | 3585 | { |
2ea97746 CE |
3586 | case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
3587 | case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */ | |
420a0d19 CE |
3588 | break; |
3589 | ||
2ea97746 CE |
3590 | case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
3591 | if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */ | |
420a0d19 CE |
3592 | case 0: break; /* No 2xx or 5xx, but no probs */ |
3593 | ||
3594 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
2ea97746 CE |
3595 | |
3596 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
3597 | case -4: HDEBUG(D_transport) | |
3598 | debug_printf("failed reaping pipelined cmd responses\n"); | |
3599 | #endif | |
420a0d19 CE |
3600 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ |
3601 | } | |
2ea97746 CE |
3602 | pipelining_active = FALSE; |
3603 | data_command = string_copy(big_buffer); /* Save for later error message */ | |
420a0d19 CE |
3604 | } |
3605 | ||
420a0d19 CE |
3606 | /* If there were no good recipients (but otherwise there have been no |
3607 | problems), just set ok TRUE, since we have handled address-specific errors | |
3608 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism | |
3609 | for handling the SMTP dot-handling protocol, flagging to apply to headers as | |
3610 | well as body. Set the appropriate timeout value to be used for each chunk. | |
3611 | (Haven't been able to make it work using select() for writing yet.) */ | |
3612 | ||
2ea97746 CE |
3613 | if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok) |
3614 | { | |
3615 | /* Save the first address of the next batch. */ | |
3616 | sx.first_addr = sx.next_addr; | |
3617 | ||
3618 | sx.ok = TRUE; | |
3619 | } | |
3620 | else | |
420a0d19 | 3621 | { |
2ea97746 CE |
3622 | transport_ctx tctx = { |
3623 | .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */ | |
3624 | .tblock = tblock, | |
3625 | .addr = addrlist, | |
3626 | .check_string = US".", | |
3627 | .escape_string = US"..", /* Escaping strings */ | |
3628 | .options = | |
3629 | topt_use_crlf | topt_escape_headers | |
3630 | | (tblock->body_only ? topt_no_headers : 0) | |
3631 | | (tblock->headers_only ? topt_no_body : 0) | |
3632 | | (tblock->return_path_add ? topt_add_return_path : 0) | |
3633 | | (tblock->delivery_date_add ? topt_add_delivery_date : 0) | |
3634 | | (tblock->envelope_to_add ? topt_add_envelope_to : 0) | |
3635 | }; | |
3636 | ||
3637 | /* If using CHUNKING we need a callback from the generic transport | |
3638 | support to us, for the sending of BDAT smtp commands and the reaping | |
3639 | of responses. The callback needs a whole bunch of state so set up | |
3640 | a transport-context structure to be passed around. */ | |
3641 | ||
3642 | if (sx.peer_offered & OPTION_CHUNKING) | |
3643 | { | |
3644 | tctx.check_string = tctx.escape_string = NULL; | |
3645 | tctx.options |= topt_use_bdat; | |
3646 | tctx.chunk_cb = smtp_chunk_cmd_callback; | |
3647 | sx.pending_BDAT = FALSE; | |
3648 | sx.good_RCPT = sx.ok; | |
3649 | sx.cmd_count = 0; | |
3650 | tctx.smtp_context = &sx; | |
3651 | } | |
3652 | else | |
3653 | tctx.options |= topt_end_dot; | |
3654 | ||
3655 | /* Save the first address of the next batch. */ | |
3656 | sx.first_addr = sx.next_addr; | |
3657 | ||
3658 | /* Responses from CHUNKING commands go in buffer. Otherwise, | |
3659 | there has not been a response. */ | |
3660 | ||
3661 | sx.buffer[0] = 0; | |
3662 | ||
420a0d19 CE |
3663 | sigalrm_seen = FALSE; |
3664 | transport_write_timeout = ob->data_timeout; | |
3665 | smtp_command = US"sending data block"; /* For error messages */ | |
3666 | DEBUG(D_transport|D_v) | |
2ea97746 CE |
3667 | if (sx.peer_offered & OPTION_CHUNKING) |
3668 | debug_printf(" will write message using CHUNKING\n"); | |
3669 | else | |
3670 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); | |
420a0d19 | 3671 | transport_count = 0; |
2ea97746 | 3672 | |
420a0d19 | 3673 | #ifndef DISABLE_DKIM |
2ea97746 CE |
3674 | dkim_exim_sign_init(); |
3675 | # ifdef EXPERIMENTAL_ARC | |
3676 | { | |
3677 | uschar * s = ob->arc_sign; | |
3678 | if (s) | |
3679 | { | |
3680 | if (!(ob->dkim.arc_signspec = s = expand_string(s))) | |
3681 | { | |
3682 | if (!f.expand_string_forcedfail) | |
3683 | { | |
3684 | message = US"failed to expand arc_sign"; | |
3685 | sx.ok = FALSE; | |
3686 | goto SEND_FAILED; | |
3687 | } | |
3688 | } | |
3689 | else if (*s) | |
3690 | { | |
3691 | /* Ask dkim code to hash the body for ARC */ | |
3692 | (void) arc_ams_setup_sign_bodyhash(); | |
3693 | ob->dkim.force_bodyhash = TRUE; | |
3694 | } | |
3695 | } | |
3696 | } | |
3697 | # endif | |
3698 | sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message); | |
420a0d19 | 3699 | #else |
2ea97746 | 3700 | sx.ok = transport_write_message(&tctx, 0); |
420a0d19 CE |
3701 | #endif |
3702 | ||
3703 | /* transport_write_message() uses write() because it is called from other | |
3704 | places to write to non-sockets. This means that under some OS (e.g. Solaris) | |
3705 | it can exit with "Broken pipe" as its error. This really means that the | |
3706 | socket got closed at the far end. */ | |
3707 | ||
3708 | transport_write_timeout = 0; /* for subsequent transports */ | |
3709 | ||
3710 | /* Failure can either be some kind of I/O disaster (including timeout), | |
2ea97746 CE |
3711 | or the failure of a transport filter or the expansion of added headers. |
3712 | Or, when CHUNKING, it can be a protocol-detected failure. */ | |
420a0d19 | 3713 | |
2ea97746 CE |
3714 | if (!sx.ok) |
3715 | if (message) goto SEND_FAILED; | |
3716 | else goto RESPONSE_FAILED; | |
420a0d19 CE |
3717 | |
3718 | /* We used to send the terminating "." explicitly here, but because of | |
3719 | buffering effects at both ends of TCP/IP connections, you don't gain | |
3720 | anything by keeping it separate, so it might as well go in the final | |
3721 | data buffer for efficiency. This is now done by setting the topt_end_dot | |
3722 | flag above. */ | |
3723 | ||
3724 | smtp_command = US"end of data"; | |
3725 | ||
2ea97746 CE |
3726 | if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1) |
3727 | { | |
3728 | /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */ | |
3729 | switch(sync_responses(&sx, sx.cmd_count-1, 0)) | |
3730 | { | |
3731 | case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
3732 | case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */ | |
3733 | break; | |
3734 | ||
3735 | case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
3736 | if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */ | |
3737 | case 0: break; /* No 2xx or 5xx, but no probs */ | |
3738 | ||
3739 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
3740 | ||
3741 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
3742 | case -4: HDEBUG(D_transport) | |
3743 | debug_printf("failed reaping pipelined cmd responses\n"); | |
3744 | #endif | |
3745 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ | |
3746 | } | |
3747 | } | |
3748 | ||
420a0d19 | 3749 | #ifndef DISABLE_PRDR |
2ea97746 CE |
3750 | /* For PRDR we optionally get a partial-responses warning followed by the |
3751 | individual responses, before going on with the overall response. If we don't | |
3752 | get the warning then deal with per non-PRDR. */ | |
3753 | ||
3754 | if(sx.prdr_active) | |
420a0d19 | 3755 | { |
2ea97746 CE |
3756 | sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout); |
3757 | if (!sx.ok && errno == 0) switch(sx.buffer[0]) | |
3758 | { | |
3759 | case '2': sx.prdr_active = FALSE; | |
3760 | sx.ok = TRUE; | |
3761 | break; | |
3762 | case '4': errno = ERRNO_DATA4XX; | |
3763 | addrlist->more_errno |= | |
3764 | ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8; | |
3765 | break; | |
3766 | } | |
420a0d19 CE |
3767 | } |
3768 | else | |
3769 | #endif | |
3770 | ||
3771 | /* For non-PRDR SMTP, we now read a single response that applies to the | |
3772 | whole message. If it is OK, then all the addresses have been delivered. */ | |
3773 | ||
2ea97746 | 3774 | if (!sx.lmtp) |
420a0d19 | 3775 | { |
2ea97746 | 3776 | sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2', |
420a0d19 | 3777 | ob->final_timeout); |
2ea97746 | 3778 | if (!sx.ok && errno == 0 && sx.buffer[0] == '4') |
420a0d19 CE |
3779 | { |
3780 | errno = ERRNO_DATA4XX; | |
2ea97746 | 3781 | addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8; |
420a0d19 CE |
3782 | } |
3783 | } | |
3784 | ||
3785 | /* For LMTP, we get back a response for every RCPT command that we sent; | |
3786 | some may be accepted and some rejected. For those that get a response, their | |
3787 | status is fixed; any that are accepted have been handed over, even if later | |
3788 | responses crash - at least, that's how I read RFC 2033. | |
3789 | ||
3790 | If all went well, mark the recipient addresses as completed, record which | |
3791 | host/IPaddress they were delivered to, and cut out RSET when sending another | |
3792 | message down the same channel. Write the completed addresses to the journal | |
3793 | now so that they are recorded in case there is a crash of hardware or | |
3794 | software before the spool gets updated. Also record the final SMTP | |
3795 | confirmation if needed (for SMTP only). */ | |
3796 | ||
2ea97746 | 3797 | if (sx.ok) |
420a0d19 CE |
3798 | { |
3799 | int flag = '='; | |
2ea97746 | 3800 | struct timeval delivery_time; |
420a0d19 | 3801 | int len; |
2ea97746 | 3802 | uschar * conf = NULL; |
420a0d19 | 3803 | |
2ea97746 CE |
3804 | timesince(&delivery_time, &start_delivery_time); |
3805 | sx.send_rset = FALSE; | |
3806 | pipelining_active = FALSE; | |
420a0d19 CE |
3807 | |
3808 | /* Set up confirmation if needed - applies only to SMTP */ | |
3809 | ||
3810 | if ( | |
2ea97746 CE |
3811 | #ifdef DISABLE_EVENT |
3812 | LOGGING(smtp_confirmation) && | |
3813 | #endif | |
3814 | !sx.lmtp | |
420a0d19 CE |
3815 | ) |
3816 | { | |
2ea97746 CE |
3817 | const uschar *s = string_printing(sx.buffer); |
3818 | /* deconst cast ok here as string_printing was checked to have alloc'n'copied */ | |
3819 | conf = (s == sx.buffer)? US string_copy(s) : US s; | |
420a0d19 CE |
3820 | } |
3821 | ||
3822 | /* Process all transported addresses - for LMTP or PRDR, read a status for | |
3823 | each one. */ | |
3824 | ||
2ea97746 | 3825 | for (addr = addrlist; addr != sx.first_addr; addr = addr->next) |
420a0d19 CE |
3826 | { |
3827 | if (addr->transport_return != PENDING_OK) continue; | |
3828 | ||
3829 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the | |
3830 | remaining addresses. Otherwise, it's a return code for just the one | |
3831 | address. For temporary errors, add a retry item for the address so that | |
3832 | it doesn't get tried again too soon. */ | |
3833 | ||
3834 | #ifndef DISABLE_PRDR | |
2ea97746 | 3835 | if (sx.lmtp || sx.prdr_active) |
420a0d19 | 3836 | #else |
2ea97746 | 3837 | if (sx.lmtp) |
420a0d19 CE |
3838 | #endif |
3839 | { | |
2ea97746 | 3840 | if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2', |
420a0d19 CE |
3841 | ob->final_timeout)) |
3842 | { | |
2ea97746 | 3843 | if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED; |
420a0d19 CE |
3844 | addr->message = string_sprintf( |
3845 | #ifndef DISABLE_PRDR | |
2ea97746 | 3846 | "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP", |
420a0d19 CE |
3847 | #else |
3848 | "LMTP error after %s: %s", | |
3849 | #endif | |
2ea97746 | 3850 | data_command, string_printing(sx.buffer)); |
420a0d19 | 3851 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
2ea97746 | 3852 | if (sx.buffer[0] == '5') |
420a0d19 CE |
3853 | addr->transport_return = FAIL; |
3854 | else | |
3855 | { | |
3856 | errno = ERRNO_DATA4XX; | |
2ea97746 | 3857 | addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8; |
420a0d19 CE |
3858 | addr->transport_return = DEFER; |
3859 | #ifndef DISABLE_PRDR | |
2ea97746 | 3860 | if (!sx.prdr_active) |
420a0d19 CE |
3861 | #endif |
3862 | retry_add_item(addr, addr->address_retry_key, 0); | |
3863 | } | |
3864 | continue; | |
3865 | } | |
2ea97746 CE |
3866 | sx.completed_addr = TRUE; /* NOW we can set this flag */ |
3867 | if (LOGGING(smtp_confirmation)) | |
420a0d19 | 3868 | { |
2ea97746 CE |
3869 | const uschar *s = string_printing(sx.buffer); |
3870 | /* deconst cast ok here as string_printing was checked to have alloc'n'copied */ | |
3871 | conf = (s == sx.buffer) ? US string_copy(s) : US s; | |
420a0d19 CE |
3872 | } |
3873 | } | |
3874 | ||
3875 | /* SMTP, or success return from LMTP for this address. Pass back the | |
3876 | actual host that was used. */ | |
3877 | ||
3878 | addr->transport_return = OK; | |
2ea97746 CE |
3879 | addr->more_errno = delivery_time.tv_sec; |
3880 | addr->delivery_usec = delivery_time.tv_usec; | |
3881 | addr->host_used = host; | |
420a0d19 CE |
3882 | addr->special_action = flag; |
3883 | addr->message = conf; | |
2ea97746 CE |
3884 | |
3885 | if (tcp_out_fastopen) | |
3886 | { | |
3887 | setflag(addr, af_tcp_fastopen_conn); | |
3888 | if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen); | |
3889 | if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data); | |
3890 | } | |
3891 | if (sx.pipelining_used) setflag(addr, af_pipelining); | |
3892 | #ifdef EXPERIMENTAL_PIPE_CONNECT | |
3893 | if (sx.early_pipe_active) setflag(addr, af_early_pipe); | |
3894 | #endif | |
420a0d19 | 3895 | #ifndef DISABLE_PRDR |
2ea97746 | 3896 | if (sx.prdr_active) setflag(addr, af_prdr_used); |
420a0d19 | 3897 | #endif |
2ea97746 | 3898 | if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used); |
420a0d19 CE |
3899 | flag = '-'; |
3900 | ||
3901 | #ifndef DISABLE_PRDR | |
2ea97746 | 3902 | if (!sx.prdr_active) |
420a0d19 CE |
3903 | #endif |
3904 | { | |
3905 | /* Update the journal. For homonymic addresses, use the base address plus | |
3906 | the transport name. See lots of comments in deliver.c about the reasons | |
3907 | for the complications when homonyms are involved. Just carry on after | |
3908 | write error, as it may prove possible to update the spool file later. */ | |
3909 | ||
3910 | if (testflag(addr, af_homonym)) | |
2ea97746 | 3911 | sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); |
420a0d19 | 3912 | else |
2ea97746 | 3913 | sprintf(CS sx.buffer, "%.500s\n", addr->unique); |
420a0d19 | 3914 | |
2ea97746 CE |
3915 | DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer); |
3916 | len = Ustrlen(CS sx.buffer); | |
3917 | if (write(journal_fd, sx.buffer, len) != len) | |
420a0d19 | 3918 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " |
2ea97746 | 3919 | "%s: %s", sx.buffer, strerror(errno)); |
420a0d19 CE |
3920 | } |
3921 | } | |
3922 | ||
3923 | #ifndef DISABLE_PRDR | |
2ea97746 | 3924 | if (sx.prdr_active) |
420a0d19 | 3925 | { |
2ea97746 CE |
3926 | const uschar * overall_message; |
3927 | ||
420a0d19 CE |
3928 | /* PRDR - get the final, overall response. For any non-success |
3929 | upgrade all the address statuses. */ | |
2ea97746 CE |
3930 | |
3931 | sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2', | |
420a0d19 | 3932 | ob->final_timeout); |
2ea97746 | 3933 | if (!sx.ok) |
420a0d19 | 3934 | { |
2ea97746 | 3935 | if(errno == 0 && sx.buffer[0] == '4') |
420a0d19 CE |
3936 | { |
3937 | errno = ERRNO_DATA4XX; | |
2ea97746 | 3938 | addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8; |
420a0d19 | 3939 | } |
2ea97746 CE |
3940 | for (addr = addrlist; addr != sx.first_addr; addr = addr->next) |
3941 | if (sx.buffer[0] == '5' || addr->transport_return == OK) | |
420a0d19 CE |
3942 | addr->transport_return = PENDING_OK; /* allow set_errno action */ |
3943 | goto RESPONSE_FAILED; | |
3944 | } | |
3945 | ||
2ea97746 CE |
3946 | /* Append the overall response to the individual PRDR response for logging |
3947 | and update the journal, or setup retry. */ | |
3948 | ||
3949 | overall_message = string_printing(sx.buffer); | |
3950 | for (addr = addrlist; addr != sx.first_addr; addr = addr->next) | |
420a0d19 | 3951 | if (addr->transport_return == OK) |
2ea97746 | 3952 | addr->message = string_sprintf("%s\\n%s", addr->message, overall_message); |
420a0d19 | 3953 | |
2ea97746 CE |
3954 | for (addr = addrlist; addr != sx.first_addr; addr = addr->next) |
3955 | if (addr->transport_return == OK) | |
3956 | { | |
3957 | if (testflag(addr, af_homonym)) | |
3958 | sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); | |
3959 | else | |
3960 | sprintf(CS sx.buffer, "%.500s\n", addr->unique); | |
3961 | ||
3962 | DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer); | |
3963 | len = Ustrlen(CS sx.buffer); | |
3964 | if (write(journal_fd, sx.buffer, len) != len) | |
3965 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " | |
3966 | "%s: %s", sx.buffer, strerror(errno)); | |
3967 | } | |
3968 | else if (addr->transport_return == DEFER) | |
3969 | retry_add_item(addr, addr->address_retry_key, -2); | |
420a0d19 CE |
3970 | } |
3971 | #endif | |
3972 | ||
3973 | /* Ensure the journal file is pushed out to disk. */ | |
3974 | ||
3975 | if (EXIMfsync(journal_fd) < 0) | |
3976 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", | |
3977 | strerror(errno)); | |
3978 | } | |
3979 | } | |
3980 | ||
3981 | ||
3982 | /* Handle general (not specific to one address) failures here. The value of ok | |
3983 | is used to skip over this code on the falling through case. A timeout causes a | |
3984 | deferral. Other errors may defer or fail according to the response code, and | |
3985 | may set up a special errno value, e.g. after connection chopped, which is | |
3986 | assumed if errno == 0 and there is no text in the buffer. If control reaches | |
3987 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as | |
3988 | the problem is not related to this specific message. */ | |
3989 | ||
2ea97746 | 3990 | if (!sx.ok) |
420a0d19 | 3991 | { |
2ea97746 CE |
3992 | int code, set_rc; |
3993 | uschar * set_message; | |
420a0d19 CE |
3994 | |
3995 | RESPONSE_FAILED: | |
2ea97746 CE |
3996 | { |
3997 | save_errno = errno; | |
3998 | message = NULL; | |
3999 | sx.send_quit = check_response(host, &save_errno, addrlist->more_errno, | |
4000 | sx.buffer, &code, &message, &pass_message); | |
4001 | goto FAILED; | |
4002 | } | |
420a0d19 CE |
4003 | |
4004 | SEND_FAILED: | |
2ea97746 CE |
4005 | { |
4006 | save_errno = errno; | |
4007 | code = '4'; | |
4008 | message = string_sprintf("send() to %s [%s] failed: %s", | |
4009 | host->name, host->address, message ? message : US strerror(save_errno)); | |
4010 | sx.send_quit = FALSE; | |
4011 | goto FAILED; | |
4012 | } | |
420a0d19 CE |
4013 | |
4014 | FAILED: | |
420a0d19 | 4015 | { |
2ea97746 CE |
4016 | BOOL message_error; |
4017 | ||
4018 | sx.ok = FALSE; /* For when reached by GOTO */ | |
4019 | set_message = message; | |
420a0d19 CE |
4020 | |
4021 | /* We want to handle timeouts after MAIL or "." and loss of connection after | |
4022 | "." specially. They can indicate a problem with the sender address or with | |
4023 | the contents of the message rather than a real error on the connection. These | |
4024 | cases are treated in the same way as a 4xx response. This next bit of code | |
4025 | does the classification. */ | |
4026 | ||
420a0d19 CE |
4027 | switch(save_errno) |
4028 | { | |
4029 | case 0: | |
4030 | case ERRNO_MAIL4XX: | |
4031 | case ERRNO_DATA4XX: | |
2ea97746 CE |
4032 | message_error = TRUE; |
4033 | break; | |
420a0d19 CE |
4034 | |
4035 | case ETIMEDOUT: | |
2ea97746 CE |
4036 | message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 || |
4037 | Ustrncmp(smtp_command,"end ",4) == 0; | |
4038 | break; | |
420a0d19 CE |
4039 | |
4040 | case ERRNO_SMTPCLOSED: | |
2ea97746 CE |
4041 | message_error = Ustrncmp(smtp_command,"end ",4) == 0; |
4042 | break; | |
420a0d19 CE |
4043 | |
4044 | default: | |
2ea97746 CE |
4045 | message_error = FALSE; |
4046 | break; | |
420a0d19 CE |
4047 | } |
4048 | ||
4049 | /* Handle the cases that are treated as message errors. These are: | |
4050 | ||
4051 | (a) negative response or timeout after MAIL | |
4052 | (b) negative response after DATA | |
4053 | (c) negative response or timeout or dropped connection after "." | |
2ea97746 | 4054 | (d) utf8 support required and not offered |
420a0d19 CE |
4055 | |
4056 | It won't be a negative response or timeout after RCPT, as that is dealt | |
4057 | with separately above. The action in all cases is to set an appropriate | |
4058 | error code for all the addresses, but to leave yield set to OK because the | |
4059 | host itself has not failed. Of course, it might in practice have failed | |
4060 | when we've had a timeout, but if so, we'll discover that at the next | |
4061 | delivery attempt. For a temporary error, set the message_defer flag, and | |
4062 | write to the logs for information if this is not the last host. The error | |
4063 | for the last host will be logged as part of the address's log line. */ | |
4064 | ||
4065 | if (message_error) | |
4066 | { | |
4067 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ | |
420a0d19 CE |
4068 | |
4069 | /* If there's an errno, the message contains just the identity of | |
4070 | the host. */ | |
4071 | ||
2ea97746 CE |
4072 | if (code == '5') |
4073 | set_rc = FAIL; | |
4074 | else /* Anything other than 5 is treated as temporary */ | |
420a0d19 | 4075 | { |
2ea97746 | 4076 | set_rc = DEFER; |
420a0d19 CE |
4077 | if (save_errno > 0) |
4078 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); | |
2ea97746 CE |
4079 | |
4080 | write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0); | |
4081 | ||
420a0d19 CE |
4082 | *message_defer = TRUE; |
4083 | } | |
4084 | } | |
4085 | ||
4086 | /* Otherwise, we have an I/O error or a timeout other than after MAIL or | |
4087 | ".", or some other transportation error. We defer all addresses and yield | |
4088 | DEFER, except for the case of failed add_headers expansion, or a transport | |
4089 | filter failure, when the yield should be ERROR, to stop it trying other | |
4090 | hosts. */ | |
4091 | ||
4092 | else | |
4093 | { | |
2ea97746 CE |
4094 | #ifdef EXPERIMENTAL_PIPE_CONNECT |
4095 | /* If we were early-pipelinng and the actual EHLO response did not match | |
4096 | the cached value we assumed, we could have detected it and passed a | |
4097 | custom errno through to here. It would be nice to RSET and retry right | |
4098 | away, but to reliably do that we eould need an extra synch point before | |
4099 | we committed to data and that would discard half the gained roundrips. | |
4100 | Or we could summarily drop the TCP connection. but that is also ugly. | |
4101 | Instead, we ignore the possibility (having freshened the cache) and rely | |
4102 | on the server telling us with a nonmessage error if we have tried to | |
4103 | do something it no longer supports. */ | |
4104 | #endif | |
4105 | set_rc = DEFER; | |
420a0d19 | 4106 | yield = (save_errno == ERRNO_CHHEADER_FAIL || |
2ea97746 | 4107 | save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER; |
420a0d19 CE |
4108 | } |
4109 | } | |
2ea97746 CE |
4110 | |
4111 | set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host | |
4112 | #ifdef EXPERIMENTAL_DSN_INFO | |
4113 | , sx.smtp_greeting, sx.helo_response | |
4114 | #endif | |
4115 | ); | |
420a0d19 CE |
4116 | } |
4117 | ||
4118 | ||
4119 | /* If all has gone well, send_quit will be set TRUE, implying we can end the | |
4120 | SMTP session tidily. However, if there were too many addresses to send in one | |
4121 | message (indicated by first_addr being non-NULL) we want to carry on with the | |
4122 | rest of them. Also, it is desirable to send more than one message down the SMTP | |
4123 | connection if there are several waiting, provided we haven't already sent so | |
4124 | many as to hit the configured limit. The function transport_check_waiting looks | |
4125 | for a waiting message and returns its id. Then transport_pass_socket tries to | |
4126 | set up a continued delivery by passing the socket on to another process. The | |
2ea97746 | 4127 | variable send_rset is FALSE if a message has just been successfully transferred. |
420a0d19 CE |
4128 | |
4129 | If we are already sending down a continued channel, there may be further | |
4130 | addresses not yet delivered that are aimed at the same host, but which have not | |
4131 | been passed in this run of the transport. In this case, continue_more will be | |
4132 | true, and all we should do is send RSET if necessary, and return, leaving the | |
4133 | channel open. | |
4134 | ||
4135 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we | |
4136 | do not want to continue with other messages down the same channel, because that | |
4137 | can lead to looping between two or more messages, all with the same, | |
4138 | temporarily failing address(es). [The retry information isn't updated yet, so | |
4139 | new processes keep on trying.] We probably also don't want to try more of this | |
4140 | message's addresses either. | |
4141 | ||
4142 | If we have started a TLS session, we have to end it before passing the | |
4143 | connection to a new process. However, not all servers can handle this (Exim | |
4144 | can), so we do not pass such a connection on if the host matches | |
4145 | hosts_nopass_tls. */ | |
4146 | ||
4147 | DEBUG(D_transport) | |
4148 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " | |
2ea97746 CE |
4149 | "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit, |
4150 | sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : ""); | |
420a0d19 | 4151 | |
2ea97746 | 4152 | if (sx.completed_addr && sx.ok && sx.send_quit) |
420a0d19 CE |
4153 | { |
4154 | BOOL more; | |
2ea97746 CE |
4155 | smtp_compare_t t_compare; |
4156 | ||
4157 | t_compare.tblock = tblock; | |
4158 | t_compare.current_sender_address = sender_address; | |
4159 | ||
4160 | if ( sx.first_addr != NULL | |
4161 | || f.continue_more | |
4162 | || ( | |
4163 | #ifdef SUPPORT_TLS | |
4164 | ( tls_out.active.sock < 0 && !continue_proxy_cipher | |
4165 | || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK | |
4166 | ) | |
420a0d19 | 4167 | && |
2ea97746 | 4168 | #endif |
420a0d19 | 4169 | transport_check_waiting(tblock->name, host->name, |
2ea97746 CE |
4170 | tblock->connection_max_messages, new_message_id, &more, |
4171 | (oicf)smtp_are_same_identities, (void*)&t_compare) | |
4172 | ) ) | |
420a0d19 CE |
4173 | { |
4174 | uschar *msg; | |
4175 | BOOL pass_message; | |
4176 | ||
2ea97746 CE |
4177 | if (sx.send_rset) |
4178 | if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0)) | |
420a0d19 CE |
4179 | { |
4180 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, | |
2ea97746 CE |
4181 | host->address, strerror(errno)); |
4182 | sx.send_quit = FALSE; | |
420a0d19 | 4183 | } |
2ea97746 CE |
4184 | else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), |
4185 | '2', ob->command_timeout))) | |
420a0d19 CE |
4186 | { |
4187 | int code; | |
2ea97746 | 4188 | sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg, |
420a0d19 | 4189 | &pass_message); |
2ea97746 | 4190 | if (!sx.send_quit) |
420a0d19 | 4191 | { |
2ea97746 CE |
4192 | DEBUG(D_transport) debug_printf("H=%s [%s] %s\n", |
4193 | host->name, host->address, msg); | |
420a0d19 CE |
4194 | } |
4195 | } | |
420a0d19 CE |
4196 | |
4197 | /* Either RSET was not needed, or it succeeded */ | |
4198 | ||
2ea97746 | 4199 | if (sx.ok) |
420a0d19 | 4200 | { |
2ea97746 CE |
4201 | #ifdef SUPPORT_TLS |
4202 | int pfd[2]; | |
4203 | #endif | |
4204 | int socket_fd = sx.cctx.sock; | |
4205 | ||
4206 | ||
4207 | if (sx.first_addr != NULL) /* More addresses still to be sent */ | |
420a0d19 CE |
4208 | { /* in this run of the transport */ |
4209 | continue_sequence++; /* Causes * in logging */ | |
4210 | goto SEND_MESSAGE; | |
4211 | } | |
420a0d19 | 4212 | |
2ea97746 CE |
4213 | /* Unless caller said it already has more messages listed for this host, |
4214 | pass the connection on to a new Exim process (below, the call to | |
4215 | transport_pass_socket). If the caller has more ready, just return with | |
4216 | the connection still open. */ | |
420a0d19 | 4217 | |
2ea97746 CE |
4218 | #ifdef SUPPORT_TLS |
4219 | if (tls_out.active.sock >= 0) | |
4220 | if ( f.continue_more | |
4221 | || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK) | |
4222 | { | |
4223 | /* Before passing the socket on, or returning to caller with it still | |
4224 | open, we must shut down TLS. Not all MTAs allow for the continuation | |
4225 | of the SMTP session when TLS is shut down. We test for this by sending | |
4226 | a new EHLO. If we don't get a good response, we don't attempt to pass | |
4227 | the socket on. */ | |
4228 | ||
4229 | tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT); | |
4230 | sx.cctx.tls_ctx = NULL; | |
4231 | smtp_peer_options = smtp_peer_options_wrap; | |
4232 | sx.ok = !sx.smtps | |
4233 | && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data) | |
4234 | >= 0 | |
4235 | && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), | |
4236 | '2', ob->command_timeout); | |
4237 | ||
4238 | if (sx.ok && f.continue_more) | |
4239 | return yield; /* More addresses for another run */ | |
4240 | } | |
4241 | else | |
4242 | { | |
4243 | /* Set up a pipe for proxying TLS for the new transport process */ | |
4244 | ||
4245 | smtp_peer_options |= OPTION_TLS; | |
4246 | if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0)) | |
4247 | socket_fd = pfd[1]; | |
4248 | else | |
4249 | set_errno(sx.first_addr, errno, US"internal allocation problem", | |
4250 | DEFER, FALSE, host | |
4251 | # ifdef EXPERIMENTAL_DSN_INFO | |
4252 | , sx.smtp_greeting, sx.helo_response | |
4253 | # endif | |
4254 | ); | |
4255 | } | |
4256 | else | |
4257 | #endif | |
4258 | if (f.continue_more) | |
4259 | return yield; /* More addresses for another run */ | |
420a0d19 | 4260 | |
2ea97746 | 4261 | /* If the socket is successfully passed, we mustn't send QUIT (or |
420a0d19 CE |
4262 | indeed anything!) from here. */ |
4263 | ||
2ea97746 CE |
4264 | /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to |
4265 | propagate it from the initial | |
4266 | */ | |
4267 | if (sx.ok && transport_pass_socket(tblock->name, host->name, | |
4268 | host->address, new_message_id, socket_fd)) | |
4269 | { | |
4270 | sx.send_quit = FALSE; | |
4271 | ||
4272 | /* We have passed the client socket to a fresh transport process. | |
4273 | If TLS is still active, we need to proxy it for the transport we | |
4274 | just passed the baton to. Fork a child to to do it, and return to | |
4275 | get logging done asap. Which way to place the work makes assumptions | |
4276 | about post-fork prioritisation which may not hold on all platforms. */ | |
4277 | #ifdef SUPPORT_TLS | |
4278 | if (tls_out.active.sock >= 0) | |
4279 | { | |
4280 | int pid = fork(); | |
4281 | if (pid == 0) /* child; fork again to disconnect totally */ | |
4282 | { | |
4283 | if (f.running_in_test_harness) millisleep(100); /* let parent debug out */ | |
4284 | /* does not return */ | |
4285 | smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd, | |
4286 | ob->command_timeout); | |
4287 | } | |
4288 | ||
4289 | if (pid > 0) /* parent */ | |
4290 | { | |
4291 | DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid); | |
4292 | close(pfd[0]); | |
4293 | /* tidy the inter-proc to disconn the proxy proc */ | |
4294 | waitpid(pid, NULL, 0); | |
4295 | tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN); | |
4296 | sx.cctx.tls_ctx = NULL; | |
4297 | (void)close(sx.cctx.sock); | |
4298 | sx.cctx.sock = -1; | |
4299 | continue_transport = NULL; | |
4300 | continue_hostname = NULL; | |
4301 | return yield; | |
4302 | } | |
4303 | log_write(0, LOG_PANIC_DIE, "fork failed"); | |
4304 | } | |
4305 | #endif | |
4306 | } | |
420a0d19 CE |
4307 | } |
4308 | ||
4309 | /* If RSET failed and there are addresses left, they get deferred. */ | |
2ea97746 CE |
4310 | else |
4311 | set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host | |
4312 | #ifdef EXPERIMENTAL_DSN_INFO | |
4313 | , sx.smtp_greeting, sx.helo_response | |
4314 | #endif | |
4315 | ); | |
420a0d19 CE |
4316 | } |
4317 | } | |
4318 | ||
4319 | /* End off tidily with QUIT unless the connection has died or the socket has | |
4320 | been passed to another process. There has been discussion on the net about what | |
4321 | to do after sending QUIT. The wording of the RFC suggests that it is necessary | |
4322 | to wait for a response, but on the other hand, there isn't anything one can do | |
4323 | with an error response, other than log it. Exim used to do that. However, | |
4324 | further discussion suggested that it is positively advantageous not to wait for | |
4325 | the response, but to close the session immediately. This is supposed to move | |
4326 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some | |
4327 | load from the server. (Hosts that are both servers and clients may not see much | |
4328 | difference, of course.) Further discussion indicated that this was safe to do | |
4329 | on Unix systems which have decent implementations of TCP/IP that leave the | |
4330 | connection around for a while (TIME_WAIT) after the application has gone away. | |
4331 | This enables the response sent by the server to be properly ACKed rather than | |
4332 | timed out, as can happen on broken TCP/IP implementations on other OS. | |
4333 | ||
4334 | This change is being made on 31-Jul-98. After over a year of trouble-free | |
4335 | operation, the old commented-out code was removed on 17-Sep-99. */ | |
4336 | ||
4337 | SEND_QUIT: | |
2ea97746 | 4338 | if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n"); |
420a0d19 CE |
4339 | |
4340 | END_OFF: | |
4341 | ||
4342 | #ifdef SUPPORT_TLS | |
2ea97746 CE |
4343 | tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT); |
4344 | sx.cctx.tls_ctx = NULL; | |
420a0d19 CE |
4345 | #endif |
4346 | ||
4347 | /* Close the socket, and return the appropriate value, first setting | |
4348 | works because the NULL setting is passed back to the calling process, and | |
4349 | remote_max_parallel is forced to 1 when delivering over an existing connection, | |
4350 | ||
4351 | If all went well and continue_more is set, we shouldn't actually get here if | |
4352 | there are further addresses, as the return above will be taken. However, | |
4353 | writing RSET might have failed, or there may be other addresses whose hosts are | |
4354 | specified in the transports, and therefore not visible at top level, in which | |
4355 | case continue_more won't get set. */ | |
4356 | ||
2ea97746 CE |
4357 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
4358 | if (sx.send_quit) | |
4359 | { | |
4360 | shutdown(sx.cctx.sock, SHUT_WR); | |
4361 | millisleep(f.running_in_test_harness ? 200 : 20); | |
4362 | if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0) | |
4363 | for (rc = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;) | |
4364 | rc--; /* drain socket */ | |
4365 | } | |
4366 | (void)close(sx.cctx.sock); | |
4367 | ||
4368 | #ifndef DISABLE_EVENT | |
4369 | (void) event_raise(tblock->event_action, US"tcp:close", NULL); | |
4370 | #endif | |
4371 | ||
420a0d19 CE |
4372 | continue_transport = NULL; |
4373 | continue_hostname = NULL; | |
4374 | return yield; | |
4375 | } | |
4376 | ||
4377 | ||
4378 | ||
4379 | ||
4380 | /************************************************* | |
4381 | * Closedown entry point * | |
4382 | *************************************************/ | |
4383 | ||
4384 | /* This function is called when exim is passed an open smtp channel | |
4385 | from another incarnation, but the message which it has been asked | |
4386 | to deliver no longer exists. The channel is on stdin. | |
4387 | ||
4388 | We might do fancy things like looking for another message to send down | |
4389 | the channel, but if the one we sought has gone, it has probably been | |
4390 | delivered by some other process that itself will seek further messages, | |
4391 | so just close down our connection. | |
4392 | ||
4393 | Argument: pointer to the transport instance block | |
4394 | Returns: nothing | |
4395 | */ | |
4396 | ||
4397 | void | |
4398 | smtp_transport_closedown(transport_instance *tblock) | |
4399 | { | |
2ea97746 CE |
4400 | smtp_transport_options_block * ob = SOB tblock->options_block; |
4401 | client_conn_ctx cctx; | |
4402 | smtp_context sx; | |
420a0d19 CE |
4403 | uschar buffer[256]; |
4404 | uschar inbuffer[4096]; | |
4405 | uschar outbuffer[16]; | |
4406 | ||
2ea97746 CE |
4407 | /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */ |
4408 | cctx.sock = fileno(stdin); | |
4409 | cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL; | |
4410 | ||
4411 | sx.inblock.cctx = &cctx; | |
4412 | sx.inblock.buffer = inbuffer; | |
4413 | sx.inblock.buffersize = sizeof(inbuffer); | |
4414 | sx.inblock.ptr = inbuffer; | |
4415 | sx.inblock.ptrend = inbuffer; | |
4416 | ||
4417 | sx.outblock.cctx = &cctx; | |
4418 | sx.outblock.buffersize = sizeof(outbuffer); | |
4419 | sx.outblock.buffer = outbuffer; | |
4420 | sx.outblock.ptr = outbuffer; | |
4421 | sx.outblock.cmd_count = 0; | |
4422 | sx.outblock.authenticating = FALSE; | |
4423 | ||
4424 | (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n"); | |
4425 | (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout); | |
4426 | (void)close(cctx.sock); | |
420a0d19 CE |
4427 | } |
4428 | ||
4429 | ||
4430 | ||
4431 | /************************************************* | |
4432 | * Prepare addresses for delivery * | |
4433 | *************************************************/ | |
4434 | ||
4435 | /* This function is called to flush out error settings from previous delivery | |
4436 | attempts to other hosts. It also records whether we got here via an MX record | |
4437 | or not in the more_errno field of the address. We are interested only in | |
4438 | addresses that are still marked DEFER - others may have got delivered to a | |
4439 | previously considered IP address. Set their status to PENDING_DEFER to indicate | |
4440 | which ones are relevant this time. | |
4441 | ||
4442 | Arguments: | |
4443 | addrlist the list of addresses | |
4444 | host the host we are delivering to | |
4445 | ||
4446 | Returns: the first address for this delivery | |
4447 | */ | |
4448 | ||
4449 | static address_item * | |
4450 | prepare_addresses(address_item *addrlist, host_item *host) | |
4451 | { | |
4452 | address_item *first_addr = NULL; | |
4453 | address_item *addr; | |
2ea97746 CE |
4454 | for (addr = addrlist; addr; addr = addr->next) |
4455 | if (addr->transport_return == DEFER) | |
4456 | { | |
4457 | if (!first_addr) first_addr = addr; | |
4458 | addr->transport_return = PENDING_DEFER; | |
4459 | addr->basic_errno = 0; | |
4460 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; | |
4461 | addr->message = NULL; | |
4462 | #ifdef SUPPORT_TLS | |
4463 | addr->cipher = NULL; | |
4464 | addr->ourcert = NULL; | |
4465 | addr->peercert = NULL; | |
4466 | addr->peerdn = NULL; | |
4467 | addr->ocsp = OCSP_NOT_REQ; | |
4468 | #endif | |
4469 | #ifdef EXPERIMENTAL_DSN_INFO | |
4470 | addr->smtp_greeting = NULL; | |
4471 | addr->helo_response = NULL; | |
4472 | #endif | |
4473 | } | |
420a0d19 CE |
4474 | return first_addr; |
4475 | } | |
4476 | ||
4477 | ||
4478 | ||
4479 | /************************************************* | |
4480 | * Main entry point * | |
4481 | *************************************************/ | |
4482 | ||
4483 | /* See local README for interface details. As this is a remote transport, it is | |
4484 | given a chain of addresses to be delivered in one connection, if possible. It | |
4485 | always returns TRUE, indicating that each address has its own independent | |
4486 | status set, except if there is a setting up problem, in which case it returns | |
4487 | FALSE. */ | |
4488 | ||
4489 | BOOL | |
4490 | smtp_transport_entry( | |
4491 | transport_instance *tblock, /* data for this instantiation */ | |
4492 | address_item *addrlist) /* addresses we are working on */ | |
4493 | { | |
4494 | int cutoff_retry; | |
2ea97746 | 4495 | int defport; |
420a0d19 CE |
4496 | int hosts_defer = 0; |
4497 | int hosts_fail = 0; | |
4498 | int hosts_looked_up = 0; | |
4499 | int hosts_retry = 0; | |
4500 | int hosts_serial = 0; | |
4501 | int hosts_total = 0; | |
4502 | int total_hosts_tried = 0; | |
4503 | address_item *addr; | |
4504 | BOOL expired = TRUE; | |
420a0d19 CE |
4505 | uschar *expanded_hosts = NULL; |
4506 | uschar *pistring; | |
4507 | uschar *tid = string_sprintf("%s transport", tblock->name); | |
2ea97746 | 4508 | smtp_transport_options_block *ob = SOB tblock->options_block; |
420a0d19 | 4509 | host_item *hostlist = addrlist->host_list; |
2ea97746 | 4510 | host_item *host; |
420a0d19 CE |
4511 | |
4512 | DEBUG(D_transport) | |
4513 | { | |
4514 | debug_printf("%s transport entered\n", tblock->name); | |
2ea97746 | 4515 | for (addr = addrlist; addr; addr = addr->next) |
420a0d19 | 4516 | debug_printf(" %s\n", addr->address); |
2ea97746 CE |
4517 | if (hostlist) |
4518 | { | |
4519 | debug_printf("hostlist:\n"); | |
4520 | for (host = hostlist; host; host = host->next) | |
4521 | debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port); | |
4522 | } | |
4523 | if (continue_hostname) | |
4524 | debug_printf("already connected to %s [%s] (on fd %d)\n", | |
4525 | continue_hostname, continue_host_address, | |
4526 | cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0); | |
420a0d19 CE |
4527 | } |
4528 | ||
4529 | /* Set the flag requesting that these hosts be added to the waiting | |
4530 | database if the delivery fails temporarily or if we are running with | |
4531 | queue_smtp or a 2-stage queue run. This gets unset for certain | |
4532 | kinds of error, typically those that are specific to the message. */ | |
4533 | ||
4534 | update_waiting = TRUE; | |
4535 | ||
4536 | /* If a host list is not defined for the addresses - they must all have the | |
4537 | same one in order to be passed to a single transport - or if the transport has | |
4538 | a host list with hosts_override set, use the host list supplied with the | |
4539 | transport. It is an error for this not to exist. */ | |
4540 | ||
2ea97746 CE |
4541 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS) |
4542 | if (tls_requiretls & REQUIRETLS_MSG) | |
4543 | ob->tls_tempfail_tryclear = FALSE; /*XXX surely we should have a local for this | |
4544 | rather than modifying the transport? */ | |
4545 | #endif | |
4546 | ||
4547 | if (!hostlist || (ob->hosts_override && ob->hosts)) | |
420a0d19 | 4548 | { |
2ea97746 | 4549 | if (!ob->hosts) |
420a0d19 CE |
4550 | { |
4551 | addrlist->message = string_sprintf("%s transport called with no hosts set", | |
4552 | tblock->name); | |
4553 | addrlist->transport_return = PANIC; | |
4554 | return FALSE; /* Only top address has status */ | |
4555 | } | |
4556 | ||
4557 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", | |
4558 | ob->hosts); | |
4559 | ||
4560 | /* If the transport's host list contains no '$' characters, and we are not | |
4561 | randomizing, it is fixed and therefore a chain of hosts can be built once | |
4562 | and for all, and remembered for subsequent use by other calls to this | |
4563 | transport. If, on the other hand, the host list does contain '$', or we are | |
4564 | randomizing its order, we have to rebuild it each time. In the fixed case, | |
4565 | as the hosts string will never be used again, it doesn't matter that we | |
4566 | replace all the : characters with zeros. */ | |
4567 | ||
2ea97746 | 4568 | if (!ob->hostlist) |
420a0d19 CE |
4569 | { |
4570 | uschar *s = ob->hosts; | |
4571 | ||
4572 | if (Ustrchr(s, '$') != NULL) | |
4573 | { | |
2ea97746 | 4574 | if (!(expanded_hosts = expand_string(s))) |
420a0d19 CE |
4575 | { |
4576 | addrlist->message = string_sprintf("failed to expand list of hosts " | |
4577 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); | |
2ea97746 | 4578 | addrlist->transport_return = f.search_find_defer ? DEFER : PANIC; |
420a0d19 CE |
4579 | return FALSE; /* Only top address has status */ |
4580 | } | |
4581 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " | |
4582 | "\"%s\"\n", s, expanded_hosts); | |
4583 | s = expanded_hosts; | |
4584 | } | |
4585 | else | |
4586 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); | |
4587 | ||
4588 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); | |
4589 | ||
4590 | /* Check that the expansion yielded something useful. */ | |
2ea97746 | 4591 | if (!hostlist) |
420a0d19 CE |
4592 | { |
4593 | addrlist->message = | |
4594 | string_sprintf("%s transport has empty hosts setting", tblock->name); | |
4595 | addrlist->transport_return = PANIC; | |
4596 | return FALSE; /* Only top address has status */ | |
4597 | } | |
4598 | ||
4599 | /* If there was no expansion of hosts, save the host list for | |
4600 | next time. */ | |
4601 | ||
2ea97746 | 4602 | if (!expanded_hosts) ob->hostlist = hostlist; |
420a0d19 CE |
4603 | } |
4604 | ||
4605 | /* This is not the first time this transport has been run in this delivery; | |
4606 | the host list was built previously. */ | |
4607 | ||
2ea97746 CE |
4608 | else |
4609 | hostlist = ob->hostlist; | |
420a0d19 CE |
4610 | } |
4611 | ||
4612 | /* The host list was supplied with the address. If hosts_randomize is set, we | |
4613 | must sort it into a random order if it did not come from MX records and has not | |
4614 | already been randomized (but don't bother if continuing down an existing | |
4615 | connection). */ | |
4616 | ||
2ea97746 | 4617 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname) |
420a0d19 CE |
4618 | { |
4619 | host_item *newlist = NULL; | |
2ea97746 | 4620 | while (hostlist) |
420a0d19 CE |
4621 | { |
4622 | host_item *h = hostlist; | |
4623 | hostlist = hostlist->next; | |
4624 | ||
4625 | h->sort_key = random_number(100); | |
4626 | ||
2ea97746 | 4627 | if (!newlist) |
420a0d19 CE |
4628 | { |
4629 | h->next = NULL; | |
4630 | newlist = h; | |
4631 | } | |
4632 | else if (h->sort_key < newlist->sort_key) | |
4633 | { | |
4634 | h->next = newlist; | |
4635 | newlist = h; | |
4636 | } | |
4637 | else | |
4638 | { | |
4639 | host_item *hh = newlist; | |
2ea97746 | 4640 | while (hh->next) |
420a0d19 CE |
4641 | { |
4642 | if (h->sort_key < hh->next->sort_key) break; | |
4643 | hh = hh->next; | |
4644 | } | |
4645 | h->next = hh->next; | |
4646 | hh->next = h; | |
4647 | } | |
4648 | } | |
4649 | ||
4650 | hostlist = addrlist->host_list = newlist; | |
4651 | } | |
4652 | ||
420a0d19 CE |
4653 | /* Sort out the default port. */ |
4654 | ||
2ea97746 | 4655 | if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE; |
420a0d19 CE |
4656 | |
4657 | /* For each host-plus-IP-address on the list: | |
4658 | ||
4659 | . If this is a continued delivery and the host isn't the one with the | |
4660 | current connection, skip. | |
4661 | ||
4662 | . If the status is unusable (i.e. previously failed or retry checked), skip. | |
4663 | ||
4664 | . If no IP address set, get the address, either by turning the name into | |
4665 | an address, calling gethostbyname if gethostbyname is on, or by calling | |
4666 | the DNS. The DNS may yield multiple addresses, in which case insert the | |
4667 | extra ones into the list. | |
4668 | ||
4669 | . Get the retry data if not previously obtained for this address and set the | |
4670 | field which remembers the state of this address. Skip if the retry time is | |
4671 | not reached. If not, remember whether retry data was found. The retry string | |
4672 | contains both the name and the IP address. | |
4673 | ||
4674 | . Scan the list of addresses and mark those whose status is DEFER as | |
4675 | PENDING_DEFER. These are the only ones that will be processed in this cycle | |
4676 | of the hosts loop. | |
4677 | ||
4678 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. | |
4679 | Some addresses may be successfully delivered, others may fail, and yet | |
4680 | others may get temporary errors and so get marked DEFER. | |
4681 | ||
4682 | . The return from the delivery attempt is OK if a connection was made and a | |
4683 | valid SMTP dialogue was completed. Otherwise it is DEFER. | |
4684 | ||
4685 | . If OK, add a "remove" retry item for this host/IPaddress, if any. | |
4686 | ||
4687 | . If fail to connect, or other defer state, add a retry item. | |
4688 | ||
4689 | . If there are any addresses whose status is still DEFER, carry on to the | |
4690 | next host/IPaddress, unless we have tried the number of hosts given | |
4691 | by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that | |
4692 | there is some fancy logic for hosts_max_try that means its limit can be | |
4693 | overstepped in some circumstances. | |
4694 | ||
4695 | If we get to the end of the list, all hosts have deferred at least one address, | |
4696 | or not reached their retry times. If delay_after_cutoff is unset, it requests a | |
4697 | delivery attempt to those hosts whose last try was before the arrival time of | |
4698 | the current message. To cope with this, we have to go round the loop a second | |
4699 | time. After that, set the status and error data for any addresses that haven't | |
4700 | had it set already. */ | |
4701 | ||
2ea97746 CE |
4702 | for (cutoff_retry = 0; |
4703 | expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2); | |
420a0d19 CE |
4704 | cutoff_retry++) |
4705 | { | |
4706 | host_item *nexthost = NULL; | |
4707 | int unexpired_hosts_tried = 0; | |
2ea97746 | 4708 | BOOL continue_host_tried = FALSE; |
420a0d19 | 4709 | |
2ea97746 | 4710 | retry_non_continued: |
420a0d19 | 4711 | for (host = hostlist; |
2ea97746 CE |
4712 | host |
4713 | && unexpired_hosts_tried < ob->hosts_max_try | |
4714 | && total_hosts_tried < ob->hosts_max_try_hardlimit; | |
420a0d19 CE |
4715 | host = nexthost) |
4716 | { | |
4717 | int rc; | |
4718 | int host_af; | |
4719 | uschar *rs; | |
420a0d19 CE |
4720 | BOOL host_is_expired = FALSE; |
4721 | BOOL message_defer = FALSE; | |
420a0d19 CE |
4722 | BOOL some_deferred = FALSE; |
4723 | address_item *first_addr = NULL; | |
4724 | uschar *interface = NULL; | |
4725 | uschar *retry_host_key = NULL; | |
4726 | uschar *retry_message_key = NULL; | |
4727 | uschar *serialize_key = NULL; | |
4728 | ||
4729 | /* Default next host is next host. :-) But this can vary if the | |
4730 | hosts_max_try limit is hit (see below). It may also be reset if a host | |
4731 | address is looked up here (in case the host was multihomed). */ | |
4732 | ||
4733 | nexthost = host->next; | |
4734 | ||
4735 | /* If the address hasn't yet been obtained from the host name, look it up | |
4736 | now, unless the host is already marked as unusable. If it is marked as | |
4737 | unusable, it means that the router was unable to find its IP address (in | |
4738 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and | |
4739 | the lookup failed last time. We don't get this far if *all* MX records | |
4740 | point to non-existent hosts; that is treated as a hard error. | |
4741 | ||
4742 | We can just skip this host entirely. When the hosts came from the router, | |
4743 | the address will timeout based on the other host(s); when the address is | |
4744 | looked up below, there is an explicit retry record added. | |
4745 | ||
4746 | Note that we mustn't skip unusable hosts if the address is not unset; they | |
4747 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ | |
4748 | ||
2ea97746 | 4749 | if (!host->address) |
420a0d19 CE |
4750 | { |
4751 | int new_port, flags; | |
4752 | host_item *hh; | |
420a0d19 CE |
4753 | |
4754 | if (host->status >= hstatus_unusable) | |
4755 | { | |
4756 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", | |
4757 | host->name); | |
4758 | continue; | |
4759 | } | |
4760 | ||
4761 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); | |
4762 | ||
4763 | /* The host name is permitted to have an attached port. Find it, and | |
4764 | strip it from the name. Just remember it for now. */ | |
4765 | ||
4766 | new_port = host_item_get_port(host); | |
4767 | ||
4768 | /* Count hosts looked up */ | |
4769 | ||
4770 | hosts_looked_up++; | |
4771 | ||
4772 | /* Find by name if so configured, or if it's an IP address. We don't | |
4773 | just copy the IP address, because we need the test-for-local to happen. */ | |
4774 | ||
2ea97746 | 4775 | flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA; |
420a0d19 CE |
4776 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; |
4777 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
4778 | ||
4779 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0) | |
2ea97746 | 4780 | rc = host_find_byname(host, NULL, flags, NULL, TRUE); |
420a0d19 CE |
4781 | else |
4782 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, | |
2ea97746 CE |
4783 | &ob->dnssec, /* domains for request/require */ |
4784 | NULL, NULL); | |
420a0d19 CE |
4785 | |
4786 | /* Update the host (and any additional blocks, resulting from | |
4787 | multihoming) with a host-specific port, if any. */ | |
4788 | ||
4789 | for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port; | |
4790 | ||
4791 | /* Failure to find the host at this time (usually DNS temporary failure) | |
4792 | is really a kind of routing failure rather than a transport failure. | |
4793 | Therefore we add a retry item of the routing kind, not to stop us trying | |
4794 | to look this name up here again, but to ensure the address gets timed | |
4795 | out if the failures go on long enough. A complete failure at this point | |
4796 | commonly points to a configuration error, but the best action is still | |
4797 | to carry on for the next host. */ | |
4798 | ||
2ea97746 | 4799 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED) |
420a0d19 CE |
4800 | { |
4801 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); | |
4802 | expired = FALSE; | |
4803 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; | |
4804 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? | |
4805 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); | |
4806 | host->status = hstatus_unusable; | |
4807 | ||
2ea97746 | 4808 | for (addr = addrlist; addr; addr = addr->next) |
420a0d19 CE |
4809 | { |
4810 | if (addr->transport_return != DEFER) continue; | |
4811 | addr->basic_errno = ERRNO_UNKNOWNHOST; | |
2ea97746 CE |
4812 | addr->message = string_sprintf( |
4813 | rc == HOST_FIND_SECURITY | |
4814 | ? "lookup of IP address for %s was insecure" | |
4815 | : "failed to lookup IP address for %s", | |
4816 | host->name); | |
420a0d19 CE |
4817 | } |
4818 | continue; | |
4819 | } | |
4820 | ||
4821 | /* If the host is actually the local host, we may have a problem, or | |
4822 | there may be some cunning configuration going on. In the problem case, | |
4823 | log things and give up. The default transport status is already DEFER. */ | |
4824 | ||
4825 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) | |
4826 | { | |
2ea97746 | 4827 | for (addr = addrlist; addr; addr = addr->next) |
420a0d19 CE |
4828 | { |
4829 | addr->basic_errno = 0; | |
4830 | addr->message = string_sprintf("%s transport found host %s to be " | |
4831 | "local", tblock->name, host->name); | |
4832 | } | |
4833 | goto END_TRANSPORT; | |
4834 | } | |
4835 | } /* End of block for IP address lookup */ | |
4836 | ||
4837 | /* If this is a continued delivery, we are interested only in the host | |
4838 | which matches the name of the existing open channel. The check is put | |
4839 | here after the local host lookup, in case the name gets expanded as a | |
4840 | result of the lookup. Set expired FALSE, to save the outer loop executing | |
4841 | twice. */ | |
4842 | ||
2ea97746 CE |
4843 | if (continue_hostname) |
4844 | if ( Ustrcmp(continue_hostname, host->name) != 0 | |
4845 | || Ustrcmp(continue_host_address, host->address) != 0 | |
4846 | ) | |
4847 | { | |
4848 | expired = FALSE; | |
4849 | continue; /* With next host */ | |
4850 | } | |
4851 | else | |
4852 | continue_host_tried = TRUE; | |
420a0d19 CE |
4853 | |
4854 | /* Reset the default next host in case a multihomed host whose addresses | |
4855 | are not looked up till just above added to the host list. */ | |
4856 | ||
4857 | nexthost = host->next; | |
4858 | ||
4859 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the | |
4860 | domain is in queue_smtp_domains, we don't actually want to attempt any | |
4861 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If | |
4862 | there is a lookup defer in queue_smtp_domains, proceed as if the domain | |
4863 | were not in it. We don't want to hold up all SMTP deliveries! Except when | |
4864 | doing a two-stage queue run, don't do this if forcing. */ | |
4865 | ||
2ea97746 CE |
4866 | if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp || |
4867 | match_isinlist(addrlist->domain, | |
4868 | (const uschar **)&queue_smtp_domains, 0, | |
420a0d19 CE |
4869 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)) |
4870 | { | |
4871 | expired = FALSE; | |
2ea97746 CE |
4872 | for (addr = addrlist; addr; addr = addr->next) |
4873 | if (addr->transport_return == DEFER) | |
4874 | addr->message = US"domain matches queue_smtp_domains, or -odqs set"; | |
420a0d19 CE |
4875 | continue; /* With next host */ |
4876 | } | |
4877 | ||
4878 | /* Count hosts being considered - purely for an intelligent comment | |
4879 | if none are usable. */ | |
4880 | ||
4881 | hosts_total++; | |
4882 | ||
4883 | /* Set $host and $host address now in case they are needed for the | |
4884 | interface expansion or the serialize_hosts check; they remain set if an | |
4885 | actual delivery happens. */ | |
4886 | ||
4887 | deliver_host = host->name; | |
4888 | deliver_host_address = host->address; | |
4889 | lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes" | |
4890 | : host->dnssec == DS_NO ? US"no" | |
4891 | : US""; | |
4892 | ||
4893 | /* Set up a string for adding to the retry key if the port number is not | |
4894 | the standard SMTP port. A host may have its own port setting that overrides | |
4895 | the default. */ | |
4896 | ||
2ea97746 CE |
4897 | pistring = string_sprintf(":%d", host->port == PORT_NONE |
4898 | ? defport : host->port); | |
420a0d19 CE |
4899 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; |
4900 | ||
4901 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface | |
2ea97746 CE |
4902 | string is set, even if constant (as different transports can have different |
4903 | constant settings), we must add it to the key that is used for retries, | |
4904 | because connections to the same host from a different interface should be | |
4905 | treated separately. */ | |
420a0d19 | 4906 | |
2ea97746 CE |
4907 | host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6; |
4908 | if ((rs = ob->interface) && *rs) | |
4909 | { | |
4910 | if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid)) | |
4911 | return FALSE; | |
4912 | pistring = string_sprintf("%s/%s", pistring, interface); | |
4913 | } | |
420a0d19 CE |
4914 | |
4915 | /* The first time round the outer loop, check the status of the host by | |
4916 | inspecting the retry data. The second time round, we are interested only | |
4917 | in expired hosts that haven't been tried since this message arrived. */ | |
4918 | ||
4919 | if (cutoff_retry == 0) | |
4920 | { | |
2ea97746 | 4921 | BOOL incl_ip; |
420a0d19 | 4922 | /* Ensure the status of the address is set by checking retry data if |
2ea97746 | 4923 | necessary. There may be host-specific retry data (applicable to all |
420a0d19 CE |
4924 | messages) and also data for retries of a specific message at this host. |
4925 | If either of these retry records are actually read, the keys used are | |
4926 | returned to save recomputing them later. */ | |
4927 | ||
2ea97746 CE |
4928 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, |
4929 | US"retry_include_ip_address", ob->retry_include_ip_address, | |
4930 | ob->expand_retry_include_ip_address, &incl_ip) != OK) | |
4931 | continue; /* with next host */ | |
4932 | ||
420a0d19 | 4933 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, |
2ea97746 | 4934 | incl_ip, &retry_host_key, &retry_message_key); |
420a0d19 | 4935 | |
2ea97746 CE |
4936 | DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name, |
4937 | host->address ? host->address : US"", pistring, | |
4938 | host->status == hstatus_usable ? "usable" | |
4939 | : host->status == hstatus_unusable ? "unusable" | |
4940 | : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?"); | |
420a0d19 CE |
4941 | |
4942 | /* Skip this address if not usable at this time, noting if it wasn't | |
4943 | actually expired, both locally and in the address. */ | |
4944 | ||
4945 | switch (host->status) | |
4946 | { | |
4947 | case hstatus_unusable: | |
2ea97746 CE |
4948 | expired = FALSE; |
4949 | setflag(addrlist, af_retry_skipped); | |
4950 | /* Fall through */ | |
420a0d19 CE |
4951 | |
4952 | case hstatus_unusable_expired: | |
2ea97746 CE |
4953 | switch (host->why) |
4954 | { | |
4955 | case hwhy_retry: hosts_retry++; break; | |
4956 | case hwhy_failed: hosts_fail++; break; | |
4957 | case hwhy_insecure: | |
4958 | case hwhy_deferred: hosts_defer++; break; | |
4959 | } | |
4960 | ||
4961 | /* If there was a retry message key, implying that previously there | |
4962 | was a message-specific defer, we don't want to update the list of | |
4963 | messages waiting for these hosts. */ | |
4964 | ||
4965 | if (retry_message_key) update_waiting = FALSE; | |
4966 | continue; /* With the next host or IP address */ | |
420a0d19 CE |
4967 | } |
4968 | } | |
4969 | ||
4970 | /* Second time round the loop: if the address is set but expired, and | |
4971 | the message is newer than the last try, let it through. */ | |
4972 | ||
4973 | else | |
4974 | { | |
2ea97746 CE |
4975 | if ( !host->address |
4976 | || host->status != hstatus_unusable_expired | |
4977 | || host->last_try > received_time.tv_sec) | |
420a0d19 | 4978 | continue; |
2ea97746 | 4979 | DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n", |
420a0d19 CE |
4980 | host->name, host->address, pistring); |
4981 | host_is_expired = TRUE; | |
4982 | } | |
4983 | ||
4984 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; | |
4985 | it remains TRUE only if all hosts are expired and none are actually tried. | |
4986 | */ | |
4987 | ||
4988 | expired = FALSE; | |
4989 | ||
4990 | /* If this host is listed as one to which access must be serialized, | |
4991 | see if another Exim process has a connection to it, and if so, skip | |
4992 | this host. If not, update the database to record our connection to it | |
4993 | and remember this for later deletion. Do not do any of this if we are | |
4994 | sending the message down a pre-existing connection. */ | |
4995 | ||
2ea97746 CE |
4996 | if ( !continue_hostname |
4997 | && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK) | |
420a0d19 CE |
4998 | { |
4999 | serialize_key = string_sprintf("host-serialize-%s", host->name); | |
2ea97746 | 5000 | if (!enq_start(serialize_key, 1)) |
420a0d19 CE |
5001 | { |
5002 | DEBUG(D_transport) | |
5003 | debug_printf("skipping host %s because another Exim process " | |
5004 | "is connected to it\n", host->name); | |
5005 | hosts_serial++; | |
5006 | continue; | |
5007 | } | |
420a0d19 CE |
5008 | } |
5009 | ||
5010 | /* OK, we have an IP address that is not waiting for its retry time to | |
5011 | arrive (it might be expired) OR (second time round the loop) we have an | |
5012 | expired host that hasn't been tried since the message arrived. Have a go | |
5013 | at delivering the message to it. First prepare the addresses by flushing | |
5014 | out the result of previous attempts, and finding the first address that | |
5015 | is still to be delivered. */ | |
5016 | ||
5017 | first_addr = prepare_addresses(addrlist, host); | |
5018 | ||
5019 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", | |
5020 | message_id, host->name, host->address, addrlist->address, | |
2ea97746 | 5021 | addrlist->next ? ", ..." : ""); |
420a0d19 | 5022 | |
2ea97746 CE |
5023 | set_process_info("delivering %s to %s [%s]%s (%s%s)", |
5024 | message_id, host->name, host->address, pistring, addrlist->address, | |
5025 | addrlist->next ? ", ..." : ""); | |
420a0d19 CE |
5026 | |
5027 | /* This is not for real; don't do the delivery. If there are | |
5028 | any remaining hosts, list them. */ | |
5029 | ||
2ea97746 | 5030 | if (f.dont_deliver) |
420a0d19 CE |
5031 | { |
5032 | host_item *host2; | |
2ea97746 CE |
5033 | set_errno_nohost(addrlist, 0, NULL, OK, FALSE); |
5034 | for (addr = addrlist; addr; addr = addr->next) | |
420a0d19 CE |
5035 | { |
5036 | addr->host_used = host; | |
5037 | addr->special_action = '*'; | |
5038 | addr->message = US"delivery bypassed by -N option"; | |
5039 | } | |
5040 | DEBUG(D_transport) | |
5041 | { | |
5042 | debug_printf("*** delivery by %s transport bypassed by -N option\n" | |
5043 | "*** host and remaining hosts:\n", tblock->name); | |
2ea97746 | 5044 | for (host2 = host; host2; host2 = host2->next) |
420a0d19 | 5045 | debug_printf(" %s [%s]\n", host2->name, |
2ea97746 | 5046 | host2->address ? host2->address : US"unset"); |
420a0d19 CE |
5047 | } |
5048 | rc = OK; | |
5049 | } | |
5050 | ||
5051 | /* This is for real. If the host is expired, we don't count it for | |
5052 | hosts_max_retry. This ensures that all hosts must expire before an address | |
5053 | is timed out, unless hosts_max_try_hardlimit (which protects against | |
5054 | lunatic DNS configurations) is reached. | |
5055 | ||
5056 | If the host is not expired and we are about to hit the hosts_max_retry | |
5057 | limit, check to see if there is a subsequent hosts with a different MX | |
5058 | value. If so, make that the next host, and don't count this one. This is a | |
5059 | heuristic to make sure that different MXs do get tried. With a normal kind | |
5060 | of retry rule, they would get tried anyway when the earlier hosts were | |
5061 | delayed, but if the domain has a "retry every time" type of rule - as is | |
5062 | often used for the the very large ISPs, that won't happen. */ | |
5063 | ||
5064 | else | |
5065 | { | |
2ea97746 CE |
5066 | host_item * thost; |
5067 | /* Make a copy of the host if it is local to this invocation | |
5068 | of the transport. */ | |
5069 | ||
5070 | if (expanded_hosts) | |
5071 | { | |
5072 | thost = store_get(sizeof(host_item)); | |
5073 | *thost = *host; | |
5074 | thost->name = string_copy(host->name); | |
5075 | thost->address = string_copy(host->address); | |
5076 | } | |
5077 | else | |
5078 | thost = host; | |
5079 | ||
420a0d19 CE |
5080 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) |
5081 | { | |
5082 | host_item *h; | |
5083 | DEBUG(D_transport) | |
5084 | debug_printf("hosts_max_try limit reached with this host\n"); | |
2ea97746 CE |
5085 | for (h = host; h; h = h->next) if (h->mx != host->mx) |
5086 | { | |
5087 | nexthost = h; | |
5088 | unexpired_hosts_tried--; | |
5089 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " | |
5090 | "and will be tried\n"); | |
5091 | break; | |
5092 | } | |
420a0d19 CE |
5093 | } |
5094 | ||
5095 | /* Attempt the delivery. */ | |
5096 | ||
5097 | total_hosts_tried++; | |
2ea97746 CE |
5098 | rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock, |
5099 | &message_defer, FALSE); | |
420a0d19 CE |
5100 | |
5101 | /* Yield is one of: | |
5102 | OK => connection made, each address contains its result; | |
5103 | message_defer is set for message-specific defers (when all | |
5104 | recipients are marked defer) | |
5105 | DEFER => there was a non-message-specific delivery problem; | |
5106 | ERROR => there was a problem setting up the arguments for a filter, | |
5107 | or there was a problem with expanding added headers | |
5108 | */ | |
5109 | ||
5110 | /* If the result is not OK, there was a non-message-specific problem. | |
5111 | If the result is DEFER, we need to write to the logs saying what happened | |
5112 | for this particular host, except in the case of authentication and TLS | |
5113 | failures, where the log has already been written. If all hosts defer a | |
5114 | general message is written at the end. */ | |
5115 | ||
2ea97746 CE |
5116 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL |
5117 | && first_addr->basic_errno != ERRNO_TLSFAILURE) | |
5118 | write_logs(host, first_addr->message, first_addr->basic_errno); | |
420a0d19 | 5119 | |
2ea97746 | 5120 | #ifndef DISABLE_EVENT |
420a0d19 | 5121 | if (rc == DEFER) |
2ea97746 CE |
5122 | deferred_event_raise(first_addr, host); |
5123 | #endif | |
420a0d19 CE |
5124 | |
5125 | /* If STARTTLS was accepted, but there was a failure in setting up the | |
5126 | TLS session (usually a certificate screwup), and the host is not in | |
5127 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with | |
5128 | TLS forcibly turned off. We have to start from scratch with a new SMTP | |
5129 | connection. That's why the retry is done from here, not from within | |
5130 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the | |
5131 | session, so the in-clear transmission after those errors, if permitted, | |
5132 | happens inside smtp_deliver().] */ | |
5133 | ||
2ea97746 CE |
5134 | #ifdef SUPPORT_TLS |
5135 | if ( rc == DEFER | |
5136 | && first_addr->basic_errno == ERRNO_TLSFAILURE | |
5137 | && ob->tls_tempfail_tryclear | |
5138 | && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK | |
5139 | ) | |
420a0d19 | 5140 | { |
2ea97746 CE |
5141 | log_write(0, LOG_MAIN, |
5142 | "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)", | |
5143 | first_addr->message, host->name, host->address); | |
420a0d19 | 5144 | first_addr = prepare_addresses(addrlist, host); |
2ea97746 CE |
5145 | rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock, |
5146 | &message_defer, TRUE); | |
420a0d19 | 5147 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) |
2ea97746 CE |
5148 | write_logs(host, first_addr->message, first_addr->basic_errno); |
5149 | # ifndef DISABLE_EVENT | |
420a0d19 | 5150 | if (rc == DEFER) |
2ea97746 CE |
5151 | deferred_event_raise(first_addr, host); |
5152 | # endif | |
420a0d19 | 5153 | } |
2ea97746 | 5154 | #endif /*SUPPORT_TLS*/ |
420a0d19 CE |
5155 | } |
5156 | ||
5157 | /* Delivery attempt finished */ | |
5158 | ||
2ea97746 CE |
5159 | rs = rc == OK ? US"OK" |
5160 | : rc == DEFER ? US"DEFER" | |
5161 | : rc == ERROR ? US"ERROR" | |
5162 | : US"?"; | |
420a0d19 | 5163 | |
2ea97746 CE |
5164 | set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s", |
5165 | message_id, host->name, host->address, pistring, addrlist->address, | |
5166 | addrlist->next ? " (& others)" : "", rs); | |
420a0d19 CE |
5167 | |
5168 | /* Release serialization if set up */ | |
5169 | ||
2ea97746 | 5170 | if (serialize_key) enq_end(serialize_key); |
420a0d19 CE |
5171 | |
5172 | /* If the result is DEFER, or if a host retry record is known to exist, we | |
5173 | need to add an item to the retry chain for updating the retry database | |
5174 | at the end of delivery. We only need to add the item to the top address, | |
5175 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it | |
5176 | for any other delivery attempts using the same address. (It is copied into | |
5177 | the unusable tree at the outer level, so even if different address blocks | |
5178 | contain the same address, it still won't get tried again.) */ | |
5179 | ||
2ea97746 | 5180 | if (rc == DEFER || retry_host_key) |
420a0d19 | 5181 | { |
2ea97746 CE |
5182 | int delete_flag = rc != DEFER ? rf_delete : 0; |
5183 | if (!retry_host_key) | |
420a0d19 | 5184 | { |
2ea97746 CE |
5185 | BOOL incl_ip; |
5186 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, | |
5187 | US"retry_include_ip_address", ob->retry_include_ip_address, | |
5188 | ob->expand_retry_include_ip_address, &incl_ip) != OK) | |
5189 | incl_ip = TRUE; /* error; use most-specific retry record */ | |
5190 | ||
5191 | retry_host_key = incl_ip | |
5192 | ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring) | |
5193 | : string_sprintf("T:%S%s", host->name, pistring); | |
420a0d19 CE |
5194 | } |
5195 | ||
5196 | /* If a delivery of another message over an existing SMTP connection | |
5197 | yields DEFER, we do NOT set up retry data for the host. This covers the | |
5198 | case when there are delays in routing the addresses in the second message | |
5199 | that are so long that the server times out. This is alleviated by not | |
5200 | routing addresses that previously had routing defers when handling an | |
5201 | existing connection, but even so, this case may occur (e.g. if a | |
5202 | previously happily routed address starts giving routing defers). If the | |
5203 | host is genuinely down, another non-continued message delivery will | |
5204 | notice it soon enough. */ | |
5205 | ||
2ea97746 | 5206 | if (delete_flag != 0 || !continue_hostname) |
420a0d19 CE |
5207 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); |
5208 | ||
5209 | /* We may have tried an expired host, if its retry time has come; ensure | |
5210 | the status reflects the expiry for the benefit of any other addresses. */ | |
5211 | ||
5212 | if (rc == DEFER) | |
5213 | { | |
2ea97746 CE |
5214 | host->status = host_is_expired |
5215 | ? hstatus_unusable_expired : hstatus_unusable; | |
420a0d19 CE |
5216 | host->why = hwhy_deferred; |
5217 | } | |
5218 | } | |
5219 | ||
5220 | /* If message_defer is set (host was OK, but every recipient got deferred | |
5221 | because of some message-specific problem), or if that had happened | |
5222 | previously so that a message retry key exists, add an appropriate item | |
5223 | to the retry chain. Note that if there was a message defer but now there is | |
5224 | a host defer, the message defer record gets deleted. That seems perfectly | |
5225 | reasonable. Also, stop the message from being remembered as waiting | |
5226 | for specific hosts. */ | |
5227 | ||
2ea97746 | 5228 | if (message_defer || retry_message_key) |
420a0d19 | 5229 | { |
2ea97746 CE |
5230 | int delete_flag = message_defer ? 0 : rf_delete; |
5231 | if (!retry_message_key) | |
420a0d19 | 5232 | { |
2ea97746 CE |
5233 | BOOL incl_ip; |
5234 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, | |
5235 | US"retry_include_ip_address", ob->retry_include_ip_address, | |
5236 | ob->expand_retry_include_ip_address, &incl_ip) != OK) | |
5237 | incl_ip = TRUE; /* error; use most-specific retry record */ | |
5238 | ||
5239 | retry_message_key = incl_ip | |
5240 | ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, | |
5241 | message_id) | |
5242 | : string_sprintf("T:%S%s:%s", host->name, pistring, message_id); | |
420a0d19 CE |
5243 | } |
5244 | retry_add_item(addrlist, retry_message_key, | |
5245 | rf_message | rf_host | delete_flag); | |
5246 | update_waiting = FALSE; | |
5247 | } | |
5248 | ||
5249 | /* Any return other than DEFER (that is, OK or ERROR) means that the | |
5250 | addresses have got their final statuses filled in for this host. In the OK | |
5251 | case, see if any of them are deferred. */ | |
5252 | ||
5253 | if (rc == OK) | |
2ea97746 | 5254 | for (addr = addrlist; addr; addr = addr->next) |
420a0d19 CE |
5255 | if (addr->transport_return == DEFER) |
5256 | { | |
5257 | some_deferred = TRUE; | |
5258 | break; | |
5259 | } | |
420a0d19 CE |
5260 | |
5261 | /* If no addresses deferred or the result was ERROR, return. We do this for | |
5262 | ERROR because a failing filter set-up or add_headers expansion is likely to | |
5263 | fail for any host we try. */ | |
5264 | ||
5265 | if (rc == ERROR || (rc == OK && !some_deferred)) | |
5266 | { | |
5267 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
5268 | return TRUE; /* Each address has its status */ | |
5269 | } | |
5270 | ||
5271 | /* If the result was DEFER or some individual addresses deferred, let | |
5272 | the loop run to try other hosts with the deferred addresses, except for the | |
5273 | case when we were trying to deliver down an existing channel and failed. | |
5274 | Don't try any other hosts in this case. */ | |
5275 | ||
2ea97746 | 5276 | if (continue_hostname) break; |
420a0d19 CE |
5277 | |
5278 | /* If the whole delivery, or some individual addresses, were deferred and | |
5279 | there are more hosts that could be tried, do not count this host towards | |
5280 | the hosts_max_try limit if the age of the message is greater than the | |
5281 | maximum retry time for this host. This means we may try try all hosts, | |
5282 | ignoring the limit, when messages have been around for some time. This is | |
5283 | important because if we don't try all hosts, the address will never time | |
5284 | out. NOTE: this does not apply to hosts_max_try_hardlimit. */ | |
5285 | ||
2ea97746 | 5286 | if ((rc == DEFER || some_deferred) && nexthost) |
420a0d19 CE |
5287 | { |
5288 | BOOL timedout; | |
5289 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); | |
5290 | ||
2ea97746 | 5291 | if (retry && retry->rules) |
420a0d19 CE |
5292 | { |
5293 | retry_rule *last_rule; | |
5294 | for (last_rule = retry->rules; | |
2ea97746 | 5295 | last_rule->next; |
420a0d19 | 5296 | last_rule = last_rule->next); |
2ea97746 | 5297 | timedout = time(NULL) - received_time.tv_sec > last_rule->timeout; |
420a0d19 CE |
5298 | } |
5299 | else timedout = TRUE; /* No rule => timed out */ | |
5300 | ||
5301 | if (timedout) | |
5302 | { | |
5303 | unexpired_hosts_tried--; | |
5304 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " | |
5305 | "hosts_max_try (message older than host's retry time)\n"); | |
5306 | } | |
5307 | } | |
2ea97746 CE |
5308 | |
5309 | DEBUG(D_transport) | |
5310 | { | |
5311 | if (unexpired_hosts_tried >= ob->hosts_max_try) | |
5312 | debug_printf("reached transport hosts_max_try limit %d\n", | |
5313 | ob->hosts_max_try); | |
5314 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) | |
5315 | debug_printf("reached transport hosts_max_try_hardlimit limit %d\n", | |
5316 | ob->hosts_max_try_hardlimit); | |
5317 | } | |
5318 | ||
5319 | if (f.running_in_test_harness) millisleep(500); /* let server debug out */ | |
420a0d19 CE |
5320 | } /* End of loop for trying multiple hosts. */ |
5321 | ||
2ea97746 CE |
5322 | /* If we failed to find a matching host in the list, for an already-open |
5323 | connection, just close it and start over with the list. This can happen | |
5324 | for routing that changes from run to run, or big multi-IP sites with | |
5325 | round-robin DNS. */ | |
5326 | ||
5327 | if (continue_hostname && !continue_host_tried) | |
5328 | { | |
5329 | int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0; | |
5330 | ||
5331 | DEBUG(D_transport) debug_printf("no hosts match already-open connection\n"); | |
5332 | #ifdef SUPPORT_TLS | |
5333 | /* A TLS conn could be open for a cutthrough, but not for a plain continued- | |
5334 | transport */ | |
5335 | /*XXX doublecheck that! */ | |
5336 | ||
5337 | if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls) | |
5338 | { | |
5339 | (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE); | |
5340 | tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT); | |
5341 | cutthrough.cctx.tls_ctx = NULL; | |
5342 | cutthrough.is_tls = FALSE; | |
5343 | } | |
5344 | else | |
5345 | #else | |
5346 | (void) write(fd, US"QUIT\r\n", 6); | |
5347 | #endif | |
5348 | (void) close(fd); | |
5349 | cutthrough.cctx.sock = -1; | |
5350 | continue_hostname = NULL; | |
5351 | goto retry_non_continued; | |
5352 | } | |
5353 | ||
420a0d19 CE |
5354 | /* This is the end of the loop that repeats iff expired is TRUE and |
5355 | ob->delay_after_cutoff is FALSE. The second time round we will | |
5356 | try those hosts that haven't been tried since the message arrived. */ | |
5357 | ||
5358 | DEBUG(D_transport) | |
5359 | { | |
5360 | debug_printf("all IP addresses skipped or deferred at least one address\n"); | |
5361 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) | |
5362 | debug_printf("retrying IP addresses not tried since message arrived\n"); | |
5363 | } | |
5364 | } | |
5365 | ||
5366 | ||
5367 | /* Get here if all IP addresses are skipped or defer at least one address. In | |
5368 | MUA wrapper mode, this will happen only for connection or other non-message- | |
5369 | specific failures. Force the delivery status for all addresses to FAIL. */ | |
5370 | ||
5371 | if (mua_wrapper) | |
5372 | { | |
2ea97746 | 5373 | for (addr = addrlist; addr; addr = addr->next) |
420a0d19 CE |
5374 | addr->transport_return = FAIL; |
5375 | goto END_TRANSPORT; | |
5376 | } | |
5377 | ||
5378 | /* In the normal, non-wrapper case, add a standard message to each deferred | |
5379 | address if there hasn't been an error, that is, if it hasn't actually been | |
5380 | tried this time. The variable "expired" will be FALSE if any deliveries were | |
5381 | actually tried, or if there was at least one host that was not expired. That | |
5382 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If | |
5383 | a delivery has been tried, an error code will be set, and the failing of the | |
5384 | message is handled by the retry code later. | |
5385 | ||
5386 | If queue_smtp is set, or this transport was called to send a subsequent message | |
5387 | down an existing TCP/IP connection, and something caused the host not to be | |
5388 | found, we end up here, but can detect these cases and handle them specially. */ | |
5389 | ||
2ea97746 | 5390 | for (addr = addrlist; addr; addr = addr->next) |
420a0d19 CE |
5391 | { |
5392 | /* If host is not NULL, it means that we stopped processing the host list | |
5393 | because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this | |
5394 | means we need to behave as if some hosts were skipped because their retry | |
5395 | time had not come. Specifically, this prevents the address from timing out. | |
5396 | However, if we have hit hosts_max_try_hardlimit, we want to behave as if all | |
5397 | hosts were tried. */ | |
5398 | ||
2ea97746 | 5399 | if (host) |
420a0d19 CE |
5400 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
5401 | { | |
5402 | DEBUG(D_transport) | |
5403 | debug_printf("hosts_max_try_hardlimit reached: behave as if all " | |
5404 | "hosts were tried\n"); | |
5405 | } | |
5406 | else | |
5407 | { | |
5408 | DEBUG(D_transport) | |
5409 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); | |
5410 | setflag(addr, af_retry_skipped); | |
5411 | } | |
420a0d19 | 5412 | |
2ea97746 | 5413 | if (f.queue_smtp) /* no deliveries attempted */ |
420a0d19 CE |
5414 | { |
5415 | addr->transport_return = DEFER; | |
5416 | addr->basic_errno = 0; | |
5417 | addr->message = US"SMTP delivery explicitly queued"; | |
5418 | } | |
5419 | ||
2ea97746 CE |
5420 | else if ( addr->transport_return == DEFER |
5421 | && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) | |
5422 | && !addr->message | |
5423 | ) | |
420a0d19 CE |
5424 | { |
5425 | addr->basic_errno = ERRNO_HRETRY; | |
2ea97746 | 5426 | if (continue_hostname) |
420a0d19 | 5427 | addr->message = US"no host found for existing SMTP connection"; |
420a0d19 CE |
5428 | else if (expired) |
5429 | { | |
5430 | setflag(addr, af_pass_message); /* This is not a security risk */ | |
2ea97746 CE |
5431 | addr->message = string_sprintf( |
5432 | "all hosts%s have been failing for a long time %s", | |
5433 | addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"", | |
5434 | ob->delay_after_cutoff | |
5435 | ? US"(and retry time not reached)" | |
5436 | : US"and were last tried after this message arrived"); | |
420a0d19 CE |
5437 | |
5438 | /* If we are already using fallback hosts, or there are no fallback hosts | |
5439 | defined, convert the result to FAIL to cause a bounce. */ | |
5440 | ||
2ea97746 | 5441 | if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts) |
420a0d19 CE |
5442 | addr->transport_return = FAIL; |
5443 | } | |
5444 | else | |
5445 | { | |
2ea97746 | 5446 | const char * s; |
420a0d19 | 5447 | if (hosts_retry == hosts_total) |
2ea97746 | 5448 | s = "retry time not reached for any host%s"; |
420a0d19 | 5449 | else if (hosts_fail == hosts_total) |
2ea97746 | 5450 | s = "all host address lookups%s failed permanently"; |
420a0d19 | 5451 | else if (hosts_defer == hosts_total) |
2ea97746 | 5452 | s = "all host address lookups%s failed temporarily"; |
420a0d19 | 5453 | else if (hosts_serial == hosts_total) |
2ea97746 | 5454 | s = "connection limit reached for all hosts%s"; |
420a0d19 | 5455 | else if (hosts_fail+hosts_defer == hosts_total) |
2ea97746 CE |
5456 | s = "all host address lookups%s failed"; |
5457 | else | |
5458 | s = "some host address lookups failed and retry time " | |
5459 | "not reached for other hosts or connection limit reached%s"; | |
5460 | ||
5461 | addr->message = string_sprintf(s, | |
5462 | addr->domain ? string_sprintf(" for '%s'", addr->domain) : US""); | |
420a0d19 CE |
5463 | } |
5464 | } | |
5465 | } | |
5466 | ||
5467 | /* Update the database which keeps information about which messages are waiting | |
5468 | for which hosts to become available. For some message-specific errors, the | |
5469 | update_waiting flag is turned off because we don't want follow-on deliveries in | |
5470 | those cases. If this transport instance is explicitly limited to one message | |
5471 | per connection then follow-on deliveries are not possible and there's no need | |
5472 | to create/update the per-transport wait-<transport_name> database. */ | |
5473 | ||
5474 | if (update_waiting && tblock->connection_max_messages != 1) | |
5475 | transport_update_waiting(hostlist, tblock->name); | |
5476 | ||
5477 | END_TRANSPORT: | |
5478 | ||
5479 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
5480 | ||
5481 | return TRUE; /* Each address has its status */ | |
5482 | } | |
5483 | ||
2ea97746 | 5484 | #endif /*!MACRO_PREDEF*/ |
420a0d19 CE |
5485 | /* vi: aw ai sw=2 |
5486 | */ | |
5487 | /* End of transport/smtp.c */ |