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Import Upstream version 4.92
[hcoop/debian/exim4.git] / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
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[] = {
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
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) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
30 #endif
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) },
41 # ifdef SUPPORT_DANE
42 { "dane_require_tls_ciphers", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
44 # endif
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,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
52 { "dkim_domain", opt_stringptr,
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) },
58 { "dkim_private_key", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
60 { "dkim_selector", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
62 { "dkim_sign_headers", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
64 { "dkim_strict", opt_stringptr,
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) },
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,
74 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
75 { "dnssec_require_domains", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
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) },
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) },
104 { "hosts_noproxy_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
106 #endif
107 { "hosts_override", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_override) },
109 #ifdef EXPERIMENTAL_PIPE_CONNECT
110 { "hosts_pipe_connect", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
112 #endif
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
122 # ifdef SUPPORT_DANE
123 { "hosts_require_dane", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
125 # endif
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) },
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) },
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) },
159 { "multi_domain", opt_expand_bool | opt_public,
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) },
165 { "retry_include_ip_address", opt_expand_bool,
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,
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
175 #ifdef SUPPORT_TLS
176 { "tls_certificate", opt_stringptr,
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) },
192 { "tls_verify_cert_hostnames", opt_stringptr,
193 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
194 { "tls_verify_certificates", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
196 { "tls_verify_hosts", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
198 #endif
199 #ifdef SUPPORT_I18N
200 { "utf8_downconvert", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
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
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
221
222 /* Default private options block for the smtp transport. */
223
224 smtp_transport_options_block smtp_transport_option_defaults = {
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,
244 #ifndef DISABLE_PRDR
245 .hosts_try_prdr = US"*",
246 #endif
247 #ifndef DISABLE_OCSP
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,
259 #ifdef SUPPORT_TLS
260 .hosts_nopass_tls = NULL,
261 .hosts_noproxy_tls = US"*",
262 #endif
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,
302 #endif
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
323 #endif
324 };
325
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
331 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
332
333
334
335 /* Local statics */
336
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);
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 {
375 smtp_transport_options_block *ob = SOB tblock->options_block;
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
383 if (tf)
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))
402 for (; addrlist; addrlist = addrlist->next)
403 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
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 {
425 smtp_transport_options_block *ob = SOB tblock->options_block;
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
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";
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);
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
481 host if set, mark addrs as having used this host
482 smtp_greeting from peer
483 helo_response from peer
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,
494 BOOL pass_message, host_item * host
495 #ifdef EXPERIMENTAL_DSN_INFO
496 , const uschar * smtp_greeting, const uschar * helo_response
497 #endif
498 )
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 }
507 for (addr = addrlist; addr; addr = addr->next)
508 if (addr->transport_return >= PENDING)
509 {
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 }
531 }
532 }
533
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 }
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
562 message where to put an error message
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
568 static BOOL
569 check_response(host_item *host, int *errno_value, int more_errno,
570 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
571 {
572 uschar * pl = pipelining_active ? US"pipelined " : US"";
573 const uschar * s;
574
575 *yield = '4'; /* Default setting is to give a temporary error */
576
577 switch(*errno_value)
578 {
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
621 }
622
623 /* Handle error responses from the remote mailer. */
624
625 if (buffer[0] != 0)
626 {
627 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
628 "%s", pl, smtp_command, s = string_printing(buffer));
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;
643 *message = US string_sprintf("Remote host closed connection "
644 "in response to %s%s", pl, smtp_command);
645 }
646 else
647 *message = US string_sprintf("%s [%s]", host->name, host->address);
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:
661 host the current host
662 detail the current message (addr_item->message)
663 basic_errno the errno (addr_item->basic_errno)
664
665 Returns: nothing
666 */
667
668 static void
669 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
670 {
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)
677 {
678 message = string_fmt_append(message, ": %s", suffix);
679 if (basic_errno > 0)
680 message = string_fmt_append(message, ": %s", strerror(basic_errno));
681 }
682 else
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);
694 }
695
696
697
698 #ifndef DISABLE_EVENT
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:
707 addr the address item containing error information
708 host the current host
709
710 Returns: nothing
711 */
712
713 static void
714 deferred_event_raise(address_item *addr, host_item *host)
715 {
716 uschar * action = addr->transport->event_action;
717 const uschar * save_domain;
718 uschar * save_local;
719
720 if (!action)
721 return;
722
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;
730
731 router_name = addr->router->name;
732 transport_name = addr->transport->name;
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;
747 router_name = transport_name = NULL;
748 }
749 #endif
750
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
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:
1045 sx smtp connection context
1046 count the number of responses to read
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
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
1058 -4 banner or EHLO failed (early-pipelining)
1059 */
1060
1061 static int
1062 sync_responses(smtp_context * sx, int count, int pending_DATA)
1063 {
1064 address_item * addr = sx->sync_addr;
1065 smtp_transport_options_block * ob = sx->conn_args.ob;
1066 int yield = 0;
1067
1068 #ifdef EXPERIMENTAL_PIPE_CONNECT
1069 if (smtp_reap_early_pipe(sx, &count) != OK)
1070 return -4;
1071 #endif
1072
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
1077 if (sx->pending_MAIL)
1078 {
1079 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1080 count--;
1081 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1082 '2', ob->command_timeout))
1083 {
1084 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1085 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1086 if (errno == 0 && sx->buffer[0] != 0)
1087 {
1088 int save_errno = 0;
1089 if (sx->buffer[0] == '4')
1090 {
1091 save_errno = ERRNO_MAIL4XX;
1092 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1093 }
1094 count = smtp_discard_responses(sx, ob, count);
1095 errno = save_errno;
1096 }
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 }
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 {
1117 while (addr->transport_return != PENDING_DEFER)
1118 if (!(addr = addr->next))
1119 return -2;
1120
1121 /* The address was accepted */
1122 addr->host_used = sx->conn_args.host;
1123
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))
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 {
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);
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
1161 else if (errno != 0 || sx->buffer[0] == 0)
1162 {
1163 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1164 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
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>: "
1174 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1175 string_printing(sx->buffer));
1176 setflag(addr, af_pass_message);
1177 if (!sx->verify)
1178 msglog_line(sx->conn_args.host, addr->message);
1179
1180 /* The response was 5xx */
1181
1182 if (sx->buffer[0] == '5')
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;
1194 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1195
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
1202
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
1219
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. */
1222
1223 update_waiting = FALSE;
1224
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. */
1228
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 }
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
1242 if (addr) sx->sync_addr = addr->next;
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
1247 if (pending_DATA != 0)
1248 {
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))
1252 {
1253 int code;
1254 uschar *msg;
1255 BOOL pass_message;
1256 if (pending_DATA > 0 || (yield & 1) != 0)
1257 {
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;
1264 }
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);
1268 }
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
1280
1281
1282 /* Try an authenticator's client entry */
1283
1284 static int
1285 try_authenticator(smtp_context * sx, auth_instance * au)
1286 {
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;
1290
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);
1296
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. */
1301
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;
1310
1311 /* Failure after writing a command */
1312
1313 case FAIL_SEND:
1314 return FAIL_SEND;
1315
1316 /* Failure after reading a response */
1317
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;
1323
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;
1336
1337 /* Internal problem, message in buffer. */
1338
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 }
1346
1347
1348
1349
1350 /* Do the client side of smtp-level authentication.
1351
1352 Arguments:
1353 sx smtp connection context
1354
1355 sx->buffer should have the EHLO response from server (gets overwritten)
1356
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
1361
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;
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
1526 Globals f.smtp_authenticated
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
1538 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1539 #endif
1540
1541 if (ob->authenticated_sender != NULL)
1542 {
1543 uschar *new = expand_string(ob->authenticated_sender);
1544 if (new == NULL)
1545 {
1546 if (!f.expand_string_forcedfail)
1547 {
1548 uschar *message = string_sprintf("failed to expand "
1549 "authenticated_sender: %s", expand_string_message);
1550 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
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
1559 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
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
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 */
1582
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;
1591
1592 /* TLSA lookup string */
1593 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1594
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;
1757
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 /*
1911 Arguments:
1912 ctx connection context
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;
1917 fd is set in the conn context, tls_out set up.
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.
1921 ERROR - helo_data or add_headers or authenticated_sender is
1922 specified for this transport, and the string failed
1923 to expand
1924 */
1925 int
1926 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1927 {
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;
1934 int yield = OK;
1935 int rc;
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;
1949 #endif
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;
1960 #endif
1961
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
1971
1972 smtp_command = US"initial connection";
1973 sx->buffer[0] = '\0';
1974
1975 /* Set up the buffer for reading SMTP response packets. */
1976
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;
1981
1982 /* Set up the buffer for holding SMTP commands while pipelining */
1983
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;
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
2005 afterward (when being used by a transport) as we're in a subprocess.
2006 For verify, unflipped once the callout is dealt with */
2007
2008 tls_modify_variables(&tls_out);
2009
2010 #ifndef SUPPORT_TLS
2011 if (sx->smtps)
2012 {
2013 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2014 DEFER, FALSE);
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
2023 if (!continue_hostname)
2024 {
2025 if (sx->verify)
2026 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2027
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)
2083 {
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 }
2092 }
2093
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 }
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. */
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
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
2149 if (!sx->smtps)
2150 {
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
2186 it didn't. */
2187
2188 if (!sx->helo_data)
2189 {
2190 message = string_sprintf("failed to expand helo_data: %s",
2191 expand_string_message);
2192 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2193 yield = DEFER;
2194 goto SEND_QUIT;
2195 }
2196 }
2197
2198 /** Debugging without sending a message
2199 sx->addrlist->transport_return = DEFER;
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
2233 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
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. */
2238 #ifdef SUPPORT_TLS
2239 if (sx->smtps)
2240 {
2241 smtp_peer_options |= OPTION_TLS;
2242 suppress_tls = FALSE;
2243 ob->tls_tempfail_tryclear = FALSE;
2244 smtp_command = US"SSL-on-connect";
2245 goto TLS_NEGOTIATE;
2246 }
2247 #endif
2248
2249 if (sx->esmtp)
2250 {
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)
2257 goto SEND_FAILED;
2258 sx->esmtp_sent = TRUE;
2259
2260 #ifdef EXPERIMENTAL_PIPE_CONNECT
2261 if (sx->early_pipe_active)
2262 {
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 }
2283 }
2284 else
2285 #endif
2286 if (!smtp_reap_ehlo(sx))
2287 goto RESPONSE_FAILED;
2288 }
2289 else
2290 DEBUG(D_transport)
2291 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2292
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 */
2315
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 }
2325
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 }
2361
2362 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2363
2364 #ifdef SUPPORT_TLS
2365 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2366 #endif
2367 }
2368 }
2369
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
2376 set from the command line if they were set in the process that passed the
2377 connection on. */
2378
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
2384 else
2385 {
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;
2398 smtp_command = big_buffer;
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");
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
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 ) )
2433 {
2434 uschar buffer2[4096];
2435
2436 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2437 goto SEND_FAILED;
2438
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
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
2458 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2459 {
2460 if ( errno != 0
2461 || buffer2[0] == 0
2462 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2463 )
2464 {
2465 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2466 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2467 goto RESPONSE_FAILED;
2468 }
2469 }
2470
2471 /* STARTTLS accepted: try to negotiate a TLS session. */
2472
2473 else
2474 TLS_NEGOTIATE:
2475 {
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);
2484
2485 if (!sx->cctx.tls_ctx)
2486 {
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;
2508 goto TLS_FAILED;
2509 }
2510
2511 /* TLS session is set up */
2512
2513 smtp_peer_options_wrap = smtp_peer_options;
2514 for (addr = sx->addrlist; addr; addr = addr->next)
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 }
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
2536 if (tls_out.active.sock >= 0)
2537 {
2538 uschar * greeting_cmd;
2539
2540 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2541 {
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;
2547 }
2548
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)
2557 {
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");
2562 }
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;
2577
2578 if (sx->lmtp)
2579 greeting_cmd = US"LHLO";
2580 else if (sx->esmtp)
2581 greeting_cmd = US"EHLO";
2582 else
2583 {
2584 greeting_cmd = US"HELO";
2585 DEBUG(D_transport)
2586 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2587 }
2588
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)
2595 goto SEND_FAILED;
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 }
2607 }
2608
2609 /* If the host is required to use a secure channel, ensure that we
2610 have one. */
2611
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 )
2621 {
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
2637 goto TLS_FAILED;
2638 }
2639 #endif /*SUPPORT_TLS*/
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
2647 #ifdef SUPPORT_TLS
2648 || tls_out.active.sock >= 0
2649 #endif
2650 )
2651 {
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. */
2692
2693 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2694
2695 /* If the response to EHLO specified support for the SIZE parameter, note
2696 this, provided size_addition is non-negative. */
2697
2698 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2699
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. */
2703
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;
2707
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");
2717
2718 #ifndef DISABLE_PRDR
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 ");
2731
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 }
2740 #endif
2741
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 }
2754 #endif
2755
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. */
2760
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 }
2768 }
2769 }
2770 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2771
2772 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2773 message-specific. */
2774
2775 sx->setting_up = FALSE;
2776
2777 #ifdef SUPPORT_I18N
2778 if (sx->addrlist->prop.utf8_msg)
2779 {
2780 uschar * s;
2781
2782 /* If the transport sets a downconversion mode it overrides any set by ACL
2783 for the message. */
2784
2785 if ((s = ob->utf8_downconvert))
2786 {
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 }
2810 }
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");
2817 }
2818
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*/
2826
2827 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2828 /*XXX should tls_requiretls actually be per-addr? */
2829
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;
2972
2973 *p = 0;
2974
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
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
2982 if ( message_size > 0
2983 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2984 {
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);
2989 while (*p) p++;
2990 }
2991
2992 #ifndef DISABLE_PRDR
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)
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 */
3004 sx->prdr_active = TRUE;
3005 sprintf(CS p, " PRDR"); p += 5;
3006 break;
3007 }
3008 break;
3009 }
3010 #endif
3011
3012 #ifdef SUPPORT_I18N
3013 /* If it supports internationalised messages, and this meesage need that,
3014 request it */
3015
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
3022
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)
3032 {
3033 address_count++;
3034 if (!(addr->dsn_flags & rf_dsnlasthop))
3035 {
3036 sx->dsn_all_lasthop = FALSE;
3037 break;
3038 }
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; }
3047 else if (dsn_ret == dsn_ret_full)
3048 { Ustrcpy(p, " RET=FULL"); p += 9; }
3049
3050 if (dsn_envid)
3051 {
3052 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3053 while (*p) p++;
3054 }
3055 }
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
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 }
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
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 }
3165
3166 mail_command = string_copy(big_buffer); /* Save for later error message */
3167
3168 switch(rc)
3169 {
3170 case -1: /* Transmission error */
3171 return -5;
3172
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))
3176 {
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;
3183 }
3184 sx->pending_MAIL = FALSE;
3185 break;
3186
3187 /* otherwise zero: command queued for pipeline */
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.
3194 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
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
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. */
3204
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)
3208 {
3209 int count;
3210 BOOL no_flush;
3211 uschar * rcpt_addr;
3212
3213 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3214 ? dsn_support_yes : dsn_support_no;
3215
3216 address_count++;
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
3274
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;
3478
3479 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3480 yield ERROR. */
3481
3482 if (!transport_set_up_command(&transport_filter_argv,
3483 tblock->filter_command, TRUE, DEFER, addrlist,
3484 string_sprintf("%.50s transport", tblock->name), NULL))
3485 {
3486 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3487 FALSE);
3488 yield = ERROR;
3489 goto SEND_QUIT;
3490 }
3491
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 }
3502
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. */
3510
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;
3517
3518
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. */
3523
3524 if (continue_hostname && continue_sequence == 1)
3525 {
3526 address_item * addr;
3527
3528 sx.peer_offered = smtp_peer_options;
3529 sx.pending_MAIL = FALSE;
3530 sx.ok = TRUE;
3531 sx.next_addr = NULL;
3532
3533 for (addr = addrlist; addr; addr = addr->next)
3534 addr->transport_return = PENDING_OK;
3535 }
3536 else
3537 {
3538 /* Initiate a message transfer. */
3539
3540 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3541 {
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;
3547 }
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)
3554 {
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 }
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
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. */
3577
3578 if ( !(sx.peer_offered & OPTION_CHUNKING)
3579 && (sx.ok || (pipelining_active && !mua_wrapper)))
3580 {
3581 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3582
3583 if (count < 0) goto SEND_FAILED;
3584 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3585 {
3586 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3587 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3588 break;
3589
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 */
3592 case 0: break; /* No 2xx or 5xx, but no probs */
3593
3594 case -1: goto END_OFF; /* Timeout on RCPT */
3595
3596 #ifdef EXPERIMENTAL_PIPE_CONNECT
3597 case -4: HDEBUG(D_transport)
3598 debug_printf("failed reaping pipelined cmd responses\n");
3599 #endif
3600 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3601 }
3602 pipelining_active = FALSE;
3603 data_command = string_copy(big_buffer); /* Save for later error message */
3604 }
3605
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
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
3621 {
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
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)
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");
3671 transport_count = 0;
3672
3673 #ifndef DISABLE_DKIM
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);
3699 #else
3700 sx.ok = transport_write_message(&tctx, 0);
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),
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. */
3713
3714 if (!sx.ok)
3715 if (message) goto SEND_FAILED;
3716 else goto RESPONSE_FAILED;
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
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
3749 #ifndef DISABLE_PRDR
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)
3755 {
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 }
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
3774 if (!sx.lmtp)
3775 {
3776 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3777 ob->final_timeout);
3778 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3779 {
3780 errno = ERRNO_DATA4XX;
3781 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
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
3797 if (sx.ok)
3798 {
3799 int flag = '=';
3800 struct timeval delivery_time;
3801 int len;
3802 uschar * conf = NULL;
3803
3804 timesince(&delivery_time, &start_delivery_time);
3805 sx.send_rset = FALSE;
3806 pipelining_active = FALSE;
3807
3808 /* Set up confirmation if needed - applies only to SMTP */
3809
3810 if (
3811 #ifdef DISABLE_EVENT
3812 LOGGING(smtp_confirmation) &&
3813 #endif
3814 !sx.lmtp
3815 )
3816 {
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;
3820 }
3821
3822 /* Process all transported addresses - for LMTP or PRDR, read a status for
3823 each one. */
3824
3825 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
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
3835 if (sx.lmtp || sx.prdr_active)
3836 #else
3837 if (sx.lmtp)
3838 #endif
3839 {
3840 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3841 ob->final_timeout))
3842 {
3843 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3844 addr->message = string_sprintf(
3845 #ifndef DISABLE_PRDR
3846 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3847 #else
3848 "LMTP error after %s: %s",
3849 #endif
3850 data_command, string_printing(sx.buffer));
3851 setflag(addr, af_pass_message); /* Allow message to go to user */
3852 if (sx.buffer[0] == '5')
3853 addr->transport_return = FAIL;
3854 else
3855 {
3856 errno = ERRNO_DATA4XX;
3857 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3858 addr->transport_return = DEFER;
3859 #ifndef DISABLE_PRDR
3860 if (!sx.prdr_active)
3861 #endif
3862 retry_add_item(addr, addr->address_retry_key, 0);
3863 }
3864 continue;
3865 }
3866 sx.completed_addr = TRUE; /* NOW we can set this flag */
3867 if (LOGGING(smtp_confirmation))
3868 {
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;
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;
3879 addr->more_errno = delivery_time.tv_sec;
3880 addr->delivery_usec = delivery_time.tv_usec;
3881 addr->host_used = host;
3882 addr->special_action = flag;
3883 addr->message = conf;
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
3895 #ifndef DISABLE_PRDR
3896 if (sx.prdr_active) setflag(addr, af_prdr_used);
3897 #endif
3898 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3899 flag = '-';
3900
3901 #ifndef DISABLE_PRDR
3902 if (!sx.prdr_active)
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))
3911 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3912 else
3913 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3914
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)
3918 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3919 "%s: %s", sx.buffer, strerror(errno));
3920 }
3921 }
3922
3923 #ifndef DISABLE_PRDR
3924 if (sx.prdr_active)
3925 {
3926 const uschar * overall_message;
3927
3928 /* PRDR - get the final, overall response. For any non-success
3929 upgrade all the address statuses. */
3930
3931 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3932 ob->final_timeout);
3933 if (!sx.ok)
3934 {
3935 if(errno == 0 && sx.buffer[0] == '4')
3936 {
3937 errno = ERRNO_DATA4XX;
3938 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3939 }
3940 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3941 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3942 addr->transport_return = PENDING_OK; /* allow set_errno action */
3943 goto RESPONSE_FAILED;
3944 }
3945
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)
3951 if (addr->transport_return == OK)
3952 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3953
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);
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
3990 if (!sx.ok)
3991 {
3992 int code, set_rc;
3993 uschar * set_message;
3994
3995 RESPONSE_FAILED:
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 }
4003
4004 SEND_FAILED:
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 }
4013
4014 FAILED:
4015 {
4016 BOOL message_error;
4017
4018 sx.ok = FALSE; /* For when reached by GOTO */
4019 set_message = message;
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
4027 switch(save_errno)
4028 {
4029 case 0:
4030 case ERRNO_MAIL4XX:
4031 case ERRNO_DATA4XX:
4032 message_error = TRUE;
4033 break;
4034
4035 case ETIMEDOUT:
4036 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4037 Ustrncmp(smtp_command,"end ",4) == 0;
4038 break;
4039
4040 case ERRNO_SMTPCLOSED:
4041 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4042 break;
4043
4044 default:
4045 message_error = FALSE;
4046 break;
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 "."
4054 (d) utf8 support required and not offered
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 */
4068
4069 /* If there's an errno, the message contains just the identity of
4070 the host. */
4071
4072 if (code == '5')
4073 set_rc = FAIL;
4074 else /* Anything other than 5 is treated as temporary */
4075 {
4076 set_rc = DEFER;
4077 if (save_errno > 0)
4078 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4079
4080 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4081
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 {
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;
4106 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4107 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4108 }
4109 }
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 );
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
4127 variable send_rset is FALSE if a message has just been successfully transferred.
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 "
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 " : "");
4151
4152 if (sx.completed_addr && sx.ok && sx.send_quit)
4153 {
4154 BOOL more;
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 )
4167 &&
4168 #endif
4169 transport_check_waiting(tblock->name, host->name,
4170 tblock->connection_max_messages, new_message_id, &more,
4171 (oicf)smtp_are_same_identities, (void*)&t_compare)
4172 ) )
4173 {
4174 uschar *msg;
4175 BOOL pass_message;
4176
4177 if (sx.send_rset)
4178 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4179 {
4180 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4181 host->address, strerror(errno));
4182 sx.send_quit = FALSE;
4183 }
4184 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4185 '2', ob->command_timeout)))
4186 {
4187 int code;
4188 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4189 &pass_message);
4190 if (!sx.send_quit)
4191 {
4192 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4193 host->name, host->address, msg);
4194 }
4195 }
4196
4197 /* Either RSET was not needed, or it succeeded */
4198
4199 if (sx.ok)
4200 {
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 */
4208 { /* in this run of the transport */
4209 continue_sequence++; /* Causes * in logging */
4210 goto SEND_MESSAGE;
4211 }
4212
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. */
4217
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 */
4260
4261 /* If the socket is successfully passed, we mustn't send QUIT (or
4262 indeed anything!) from here. */
4263
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 }
4307 }
4308
4309 /* If RSET failed and there are addresses left, they get deferred. */
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 );
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:
4338 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4339
4340 END_OFF:
4341
4342 #ifdef SUPPORT_TLS
4343 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4344 sx.cctx.tls_ctx = NULL;
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
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
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 {
4400 smtp_transport_options_block * ob = SOB tblock->options_block;
4401 client_conn_ctx cctx;
4402 smtp_context sx;
4403 uschar buffer[256];
4404 uschar inbuffer[4096];
4405 uschar outbuffer[16];
4406
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);
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;
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 }
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;
4495 int defport;
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;
4505 uschar *expanded_hosts = NULL;
4506 uschar *pistring;
4507 uschar *tid = string_sprintf("%s transport", tblock->name);
4508 smtp_transport_options_block *ob = SOB tblock->options_block;
4509 host_item *hostlist = addrlist->host_list;
4510 host_item *host;
4511
4512 DEBUG(D_transport)
4513 {
4514 debug_printf("%s transport entered\n", tblock->name);
4515 for (addr = addrlist; addr; addr = addr->next)
4516 debug_printf(" %s\n", addr->address);
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);
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
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))
4548 {
4549 if (!ob->hosts)
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 '$', or we are
4564 randomizing its order, we have to rebuild it each time. In the fixed case,
4565 as the hosts string will never be used again, it doesn't matter that we
4566 replace all the : characters with zeros. */
4567
4568 if (!ob->hostlist)
4569 {
4570 uschar *s = ob->hosts;
4571
4572 if (Ustrchr(s, '$') != NULL)
4573 {
4574 if (!(expanded_hosts = expand_string(s)))
4575 {
4576 addrlist->message = string_sprintf("failed to expand list of hosts "
4577 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4578 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
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. */
4591 if (!hostlist)
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
4602 if (!expanded_hosts) ob->hostlist = hostlist;
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
4608 else
4609 hostlist = ob->hostlist;
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
4617 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4618 {
4619 host_item *newlist = NULL;
4620 while (hostlist)
4621 {
4622 host_item *h = hostlist;
4623 hostlist = hostlist->next;
4624
4625 h->sort_key = random_number(100);
4626
4627 if (!newlist)
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;
4640 while (hh->next)
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
4653 /* Sort out the default port. */
4654
4655 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
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
4702 for (cutoff_retry = 0;
4703 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4704 cutoff_retry++)
4705 {
4706 host_item *nexthost = NULL;
4707 int unexpired_hosts_tried = 0;
4708 BOOL continue_host_tried = FALSE;
4709
4710 retry_non_continued:
4711 for (host = hostlist;
4712 host
4713 && unexpired_hosts_tried < ob->hosts_max_try
4714 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4715 host = nexthost)
4716 {
4717 int rc;
4718 int host_af;
4719 uschar *rs;
4720 BOOL host_is_expired = FALSE;
4721 BOOL message_defer = FALSE;
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
4749 if (!host->address)
4750 {
4751 int new_port, flags;
4752 host_item *hh;
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
4775 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
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)
4780 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4781 else
4782 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4783 &ob->dnssec, /* domains for request/require */
4784 NULL, NULL);
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
4799 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
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
4808 for (addr = addrlist; addr; addr = addr->next)
4809 {
4810 if (addr->transport_return != DEFER) continue;
4811 addr->basic_errno = ERRNO_UNKNOWNHOST;
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);
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 {
4827 for (addr = addrlist; addr; addr = addr->next)
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
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;
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
4866 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4867 match_isinlist(addrlist->domain,
4868 (const uschar **)&queue_smtp_domains, 0,
4869 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4870 {
4871 expired = FALSE;
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";
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
4897 pistring = string_sprintf(":%d", host->port == PORT_NONE
4898 ? defport : host->port);
4899 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4900
4901 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
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. */
4906
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 }
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 {
4921 BOOL incl_ip;
4922 /* Ensure the status of the address is set by checking retry data if
4923 necessary. There may be host-specific retry data (applicable to all
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
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
4933 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4934 incl_ip, &retry_host_key, &retry_message_key);
4935
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)" : "?");
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:
4948 expired = FALSE;
4949 setflag(addrlist, af_retry_skipped);
4950 /* Fall through */
4951
4952 case hstatus_unusable_expired:
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 */
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 {
4975 if ( !host->address
4976 || host->status != hstatus_unusable_expired
4977 || host->last_try > received_time.tv_sec)
4978 continue;
4979 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
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
4996 if ( !continue_hostname
4997 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
4998 {
4999 serialize_key = string_sprintf("host-serialize-%s", host->name);
5000 if (!enq_start(serialize_key, 1))
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 }
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,
5021 addrlist->next ? ", ..." : "");
5022
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 ? ", ..." : "");
5026
5027 /* This is not for real; don't do the delivery. If there are
5028 any remaining hosts, list them. */
5029
5030 if (f.dont_deliver)
5031 {
5032 host_item *host2;
5033 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5034 for (addr = addrlist; addr; addr = addr->next)
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);
5044 for (host2 = host; host2; host2 = host2->next)
5045 debug_printf(" %s [%s]\n", host2->name,
5046 host2->address ? host2->address : US"unset");
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 {
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
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");
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 }
5093 }
5094
5095 /* Attempt the delivery. */
5096
5097 total_hosts_tried++;
5098 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5099 &message_defer, FALSE);
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
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);
5119
5120 #ifndef DISABLE_EVENT
5121 if (rc == DEFER)
5122 deferred_event_raise(first_addr, host);
5123 #endif
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
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 )
5140 {
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);
5144 first_addr = prepare_addresses(addrlist, host);
5145 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5146 &message_defer, TRUE);
5147 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5148 write_logs(host, first_addr->message, first_addr->basic_errno);
5149 # ifndef DISABLE_EVENT
5150 if (rc == DEFER)
5151 deferred_event_raise(first_addr, host);
5152 # endif
5153 }
5154 #endif /*SUPPORT_TLS*/
5155 }
5156
5157 /* Delivery attempt finished */
5158
5159 rs = rc == OK ? US"OK"
5160 : rc == DEFER ? US"DEFER"
5161 : rc == ERROR ? US"ERROR"
5162 : US"?";
5163
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);
5167
5168 /* Release serialization if set up */
5169
5170 if (serialize_key) enq_end(serialize_key);
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
5180 if (rc == DEFER || retry_host_key)
5181 {
5182 int delete_flag = rc != DEFER ? rf_delete : 0;
5183 if (!retry_host_key)
5184 {
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);
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
5206 if (delete_flag != 0 || !continue_hostname)
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 {
5214 host->status = host_is_expired
5215 ? hstatus_unusable_expired : hstatus_unusable;
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
5228 if (message_defer || retry_message_key)
5229 {
5230 int delete_flag = message_defer ? 0 : rf_delete;
5231 if (!retry_message_key)
5232 {
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);
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)
5254 for (addr = addrlist; addr; addr = addr->next)
5255 if (addr->transport_return == DEFER)
5256 {
5257 some_deferred = TRUE;
5258 break;
5259 }
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
5276 if (continue_hostname) break;
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
5286 if ((rc == DEFER || some_deferred) && nexthost)
5287 {
5288 BOOL timedout;
5289 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5290
5291 if (retry && retry->rules)
5292 {
5293 retry_rule *last_rule;
5294 for (last_rule = retry->rules;
5295 last_rule->next;
5296 last_rule = last_rule->next);
5297 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
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 }
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 */
5320 } /* End of loop for trying multiple hosts. */
5321
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
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 {
5373 for (addr = addrlist; addr; addr = addr->next)
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
5390 for (addr = addrlist; addr; addr = addr->next)
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
5399 if (host)
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 }
5412
5413 if (f.queue_smtp) /* no deliveries attempted */
5414 {
5415 addr->transport_return = DEFER;
5416 addr->basic_errno = 0;
5417 addr->message = US"SMTP delivery explicitly queued";
5418 }
5419
5420 else if ( addr->transport_return == DEFER
5421 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5422 && !addr->message
5423 )
5424 {
5425 addr->basic_errno = ERRNO_HRETRY;
5426 if (continue_hostname)
5427 addr->message = US"no host found for existing SMTP connection";
5428 else if (expired)
5429 {
5430 setflag(addr, af_pass_message); /* This is not a security risk */
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");
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
5441 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5442 addr->transport_return = FAIL;
5443 }
5444 else
5445 {
5446 const char * s;
5447 if (hosts_retry == hosts_total)
5448 s = "retry time not reached for any host%s";
5449 else if (hosts_fail == hosts_total)
5450 s = "all host address lookups%s failed permanently";
5451 else if (hosts_defer == hosts_total)
5452 s = "all host address lookups%s failed temporarily";
5453 else if (hosts_serial == hosts_total)
5454 s = "connection limit reached for all hosts%s";
5455 else if (hosts_fail+hosts_defer == hosts_total)
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"");
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
5484 #endif /*!MACRO_PREDEF*/
5485 /* vi: aw ai sw=2
5486 */
5487 /* End of transport/smtp.c */
exim4 packaging