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9c0f2dac RS |
1 | /* pop.c: client routines for talking to a POP3-protocol post-office server |
2 | Copyright (c) 1991,1993 Free Software Foundation, Inc. | |
3 | Written by Jonathan Kamens, jik@security.ov.com. | |
4 | ||
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
21 | #ifdef MAIL_USE_POP | |
22 | ||
23 | #include <sys/types.h> | |
24 | #include <netinet/in.h> | |
25 | #include <sys/socket.h> | |
26 | #include <pop.h> | |
27 | #ifdef sun | |
28 | #include <malloc.h> | |
29 | #else | |
30 | extern char *malloc (/* unsigned */); | |
31 | extern char *realloc (/* char *, unsigned */); | |
32 | extern void free (/* char * */); | |
33 | #endif | |
34 | #endif | |
35 | #ifdef HESIOD | |
36 | #include <hesiod.h> | |
37 | /* | |
38 | * It really shouldn't be necessary to put this declaration here, but | |
39 | * the version of hesiod.h that Athena has installed in release 7.2 | |
40 | * doesn't declare this function; I don't know if the 7.3 version of | |
41 | * hesiod.h does. | |
42 | */ | |
43 | extern struct servent *hes_getservbyname (/* char *, char * */); | |
44 | #endif | |
45 | #include <pwd.h> | |
46 | #include <string.h> | |
47 | #include <strings.h> | |
48 | #include <netdb.h> | |
49 | #include <errno.h> | |
50 | #include <stdio.h> | |
51 | #ifdef KERBEROS | |
52 | #ifndef KRB5 | |
53 | #include <krb.h> | |
54 | #include <des.h> | |
55 | #else /* KRB5 */ | |
56 | #include <krb5/krb5.h> | |
57 | #include <krb5/ext-proto.h> | |
58 | #include <ctype.h> | |
59 | #endif /* KRB5 */ | |
60 | ||
61 | extern char *getenv (/* char * */); | |
62 | extern char *getlogin (/* void */); | |
63 | extern char *getpass (/* char * */); | |
64 | extern char *strerror (/* int */); | |
65 | ||
66 | #ifdef KERBEROS | |
67 | extern int krb_sendauth (/* long, int, KTEXT, char *, char *, char *, | |
68 | u_long, MSG_DAT *, CREDENTIALS *, Key_schedule, | |
69 | struct sockaddr_in *, struct sockaddr_in *, | |
70 | char * */); | |
71 | extern char *krb_realmofhost (/* char * */); | |
72 | #endif | |
73 | ||
74 | #ifndef HAVE_H_ERRNO | |
75 | extern int h_errno; | |
76 | #endif | |
77 | ||
78 | static int socket_connection (/* char *, int */); | |
79 | static char *getline (/* popserver */); | |
80 | static int sendline (/* popserver, char * */); | |
81 | static int fullwrite (/* int, char *, int */); | |
82 | static int getok (/* popserver */); | |
83 | #if 0 | |
84 | static int gettermination (/* popserver */); | |
85 | #endif | |
86 | static void pop_trash (/* popserver */); | |
87 | ||
88 | #define ERROR_MAX 80 /* a pretty arbitrary size */ | |
89 | #define POP_PORT 110 | |
90 | #define KPOP_PORT 1109 | |
91 | #define POP_SERVICE "pop" | |
92 | #ifdef KERBEROS | |
93 | #ifdef KRB5 | |
94 | #define KPOP_SERVICE "k5pop"; | |
95 | #else | |
96 | #define KPOP_SERVICE "kpop" | |
97 | #endif | |
98 | #endif | |
99 | ||
100 | char pop_error[ERROR_MAX]; | |
101 | int pop_debug = 0; | |
102 | ||
103 | #ifndef min | |
104 | #define min(a,b) (((a) < (b)) ? (a) : (b)) | |
105 | #endif | |
106 | ||
107 | /* | |
108 | * Function: pop_open (char *host, char *username, char *password, | |
109 | * int flags) | |
110 | * | |
111 | * Purpose: Establishes a connection with a post-office server, and | |
112 | * completes the authorization portion of the session. | |
113 | * | |
114 | * Arguments: | |
115 | * host The server host with which the connection should be | |
116 | * established. Optional. If omitted, internal | |
117 | * heuristics will be used to determine the server host, | |
118 | * if possible. | |
119 | * username | |
120 | * The username of the mail-drop to access. Optional. | |
121 | * If omitted, internal heuristics will be used to | |
122 | * determine the username, if possible. | |
123 | * password | |
124 | * The password to use for authorization. If omitted, | |
125 | * internal heuristics will be used to determine the | |
126 | * password, if possible. | |
127 | * flags A bit mask containing flags controlling certain | |
128 | * functions of the routine. Valid flags are defined in | |
129 | * the file pop.h | |
130 | * | |
131 | * Return value: Upon successful establishment of a connection, a | |
132 | * non-null popserver will be returned. Otherwise, null will be | |
133 | * returned, and the string variable pop_error will contain an | |
134 | * explanation of the error. | |
135 | */ | |
136 | popserver | |
137 | pop_open (host, username, password, flags) | |
138 | char *host; | |
139 | char *username; | |
140 | char *password; | |
141 | int flags; | |
142 | { | |
143 | int sock; | |
144 | popserver server; | |
145 | ||
146 | /* Determine the user name */ | |
147 | if (! username) | |
148 | { | |
149 | username = getenv ("USER"); | |
150 | if (! (username && *username)) | |
151 | { | |
152 | username = getlogin (); | |
153 | if (! (username && *username)) | |
154 | { | |
155 | struct passwd *passwd; | |
156 | passwd = getpwuid (getuid ()); | |
157 | if (passwd && passwd->pw_name && *passwd->pw_name) | |
158 | { | |
159 | username = passwd->pw_name; | |
160 | } | |
161 | else | |
162 | { | |
163 | strcpy (pop_error, "Could not determine username"); | |
164 | return (0); | |
165 | } | |
166 | } | |
167 | } | |
168 | } | |
169 | ||
170 | /* | |
171 | * Determine the mail host. | |
172 | */ | |
173 | ||
174 | if (! host) | |
175 | { | |
176 | host = getenv ("MAILHOST"); | |
177 | } | |
178 | ||
179 | #ifdef HESIOD | |
180 | if ((! host) && (! (flags & POP_NO_HESIOD))) | |
181 | { | |
182 | struct hes_postoffice *office; | |
183 | office = hes_getmailhost (username); | |
184 | if (office && office->po_type && (! strcmp (office->po_type, "POP")) | |
185 | && office->po_name && *office->po_name && office->po_host | |
186 | && *office->po_host) | |
187 | { | |
188 | host = office->po_host; | |
189 | username = office->po_name; | |
190 | } | |
191 | } | |
192 | #endif | |
193 | ||
194 | #ifdef MAILHOST | |
195 | if (! host) | |
196 | { | |
197 | host = MAILHOST; | |
198 | } | |
199 | #endif | |
200 | ||
201 | if (! host) | |
202 | { | |
203 | strcpy (pop_error, "Could not determine POP server"); | |
204 | return (0); | |
205 | } | |
206 | ||
207 | /* Determine the password */ | |
208 | #ifdef KERBEROS | |
209 | #define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS)) | |
210 | #else | |
211 | #define DONT_NEED_PASSWORD 0 | |
212 | #endif | |
213 | ||
214 | if ((! password) && (! DONT_NEED_PASSWORD)) | |
215 | { | |
216 | if (! (flags & POP_NO_GETPASS)) | |
217 | { | |
218 | password = getpass ("Enter POP password:"); | |
219 | } | |
220 | if (! password) | |
221 | { | |
222 | strcpy (pop_error, "Could not determine POP password"); | |
223 | return (0); | |
224 | } | |
225 | } | |
226 | if (password) | |
227 | flags |= POP_NO_KERBEROS; | |
228 | else | |
229 | password = username; | |
230 | ||
231 | sock = socket_connection (host, flags); | |
232 | if (sock == -1) | |
233 | return (0); | |
234 | ||
235 | server = (popserver) malloc (sizeof (struct _popserver)); | |
236 | if (! server) | |
237 | { | |
238 | strcpy (pop_error, "Out of memory in pop_open"); | |
239 | return (0); | |
240 | } | |
241 | server->buffer = (char *) malloc (GETLINE_MIN); | |
242 | if (! server->buffer) | |
243 | { | |
244 | strcpy (pop_error, "Out of memory in pop_open"); | |
245 | free ((char *) server); | |
246 | return (0); | |
247 | } | |
248 | ||
249 | server->file = sock; | |
250 | server->data = 0; | |
251 | server->buffer_index = 0; | |
252 | server->buffer_size = GETLINE_MIN; | |
253 | server->in_multi = 0; | |
254 | ||
255 | if (getok (server)) | |
256 | return (0); | |
257 | ||
258 | /* | |
259 | * I really shouldn't use the pop_error variable like this, but.... | |
260 | */ | |
261 | if (strlen (username) > ERROR_MAX - 6) | |
262 | { | |
263 | pop_close (server); | |
264 | strcpy (pop_error, | |
265 | "Username too long; recompile pop.c with larger ERROR_MAX"); | |
266 | return (0); | |
267 | } | |
268 | sprintf (pop_error, "USER %s", username); | |
269 | ||
270 | if (sendline (server, pop_error) || getok (server)) | |
271 | { | |
272 | return (0); | |
273 | } | |
274 | ||
275 | if (strlen (password) > ERROR_MAX - 6) | |
276 | { | |
277 | pop_close (server); | |
278 | strcpy (pop_error, | |
279 | "Password too long; recompile pop.c with larger ERROR_MAX"); | |
280 | return (0); | |
281 | } | |
282 | sprintf (pop_error, "PASS %s", password); | |
283 | ||
284 | if (sendline (server, pop_error) || getok (server)) | |
285 | { | |
286 | return (0); | |
287 | } | |
288 | ||
289 | return (server); | |
290 | } | |
291 | ||
292 | /* | |
293 | * Function: pop_stat | |
294 | * | |
295 | * Purpose: Issue the STAT command to the server and return (in the | |
296 | * value parameters) the number of messages in the maildrop and | |
297 | * the total size of the maildrop. | |
298 | * | |
299 | * Return value: 0 on success, or non-zero with an error in pop_error | |
300 | * in failure. | |
301 | * | |
302 | * Side effects: On failure, may make further operations on the | |
303 | * connection impossible. | |
304 | */ | |
305 | int | |
306 | pop_stat (server, count, size) | |
307 | popserver server; | |
308 | int *count; | |
309 | int *size; | |
310 | { | |
311 | char *fromserver; | |
312 | ||
313 | if (server->in_multi) | |
314 | { | |
315 | strcpy (pop_error, "In multi-line query in pop_stat"); | |
316 | return (-1); | |
317 | } | |
318 | ||
319 | if (sendline (server, "STAT") || (! (fromserver = getline (server)))) | |
320 | return (-1); | |
321 | ||
322 | if (strncmp (fromserver, "+OK ", 4)) | |
323 | { | |
324 | if (0 == strncmp (fromserver, "-ERR", 4)) | |
325 | { | |
326 | strncpy (pop_error, fromserver, ERROR_MAX); | |
327 | } | |
328 | else | |
329 | { | |
330 | strcpy (pop_error, | |
331 | "Unexpected response from POP server in pop_stat"); | |
332 | pop_trash (server); | |
333 | } | |
334 | return (-1); | |
335 | } | |
336 | ||
337 | *count = atoi (&fromserver[4]); | |
338 | ||
339 | fromserver = index (&fromserver[4], ' '); | |
340 | if (! fromserver) | |
341 | { | |
342 | strcpy (pop_error, | |
343 | "Badly formatted response from server in pop_stat"); | |
344 | pop_trash (server); | |
345 | return (-1); | |
346 | } | |
347 | ||
348 | *size = atoi (fromserver + 1); | |
349 | ||
350 | return (0); | |
351 | } | |
352 | ||
353 | /* | |
354 | * Function: pop_list | |
355 | * | |
356 | * Purpose: Performs the POP "list" command and returns (in value | |
357 | * parameters) two malloc'd zero-terminated arrays -- one of | |
358 | * message IDs, and a parallel one of sizes. | |
359 | * | |
360 | * Arguments: | |
361 | * server The pop connection to talk to. | |
362 | * message The number of the one message about which to get | |
363 | * information, or 0 to get information about all | |
364 | * messages. | |
365 | * | |
366 | * Return value: 0 on success, non-zero with error in pop_error on | |
367 | * failure. | |
368 | * | |
369 | * Side effects: On failure, may make further operations on the | |
370 | * connection impossible. | |
371 | */ | |
372 | int | |
373 | pop_list (server, message, IDs, sizes) | |
374 | popserver server; | |
375 | int message; | |
376 | int **IDs; | |
377 | int **sizes; | |
378 | { | |
379 | int how_many, i; | |
380 | char *fromserver; | |
381 | ||
382 | if (server->in_multi) | |
383 | { | |
384 | strcpy (pop_error, "In multi-line query in pop_list"); | |
385 | return (-1); | |
386 | } | |
387 | ||
388 | if (message) | |
389 | how_many = 1; | |
390 | else | |
391 | { | |
392 | int count, size; | |
393 | if (pop_stat (server, &count, &size)) | |
394 | return (-1); | |
395 | how_many = count; | |
396 | } | |
397 | ||
398 | *IDs = (int *) malloc ((how_many + 1) * sizeof (int)); | |
399 | *sizes = (int *) malloc ((how_many + 1) * sizeof (int)); | |
400 | if (! (*IDs && *sizes)) | |
401 | { | |
402 | strcpy (pop_error, "Out of memory in pop_list"); | |
403 | return (-1); | |
404 | } | |
405 | ||
406 | if (message) | |
407 | { | |
408 | sprintf (pop_error, "LIST %d", message); | |
409 | if (sendline (server, pop_error)) | |
410 | { | |
411 | free ((char *) *IDs); | |
412 | free ((char *) *sizes); | |
413 | return (-1); | |
414 | } | |
415 | if (! (fromserver = getline (server))) | |
416 | { | |
417 | free ((char *) *IDs); | |
418 | free ((char *) *sizes); | |
419 | return (-1); | |
420 | } | |
421 | if (strncmp (fromserver, "+OK ", 4)) | |
422 | { | |
423 | if (! strncmp (fromserver, "-ERR", 4)) | |
424 | strncpy (pop_error, fromserver, ERROR_MAX); | |
425 | else | |
426 | { | |
427 | strcpy (pop_error, | |
428 | "Unexpected response from server in pop_list"); | |
429 | pop_trash (server); | |
430 | } | |
431 | free ((char *) *IDs); | |
432 | free ((char *) *sizes); | |
433 | return (-1); | |
434 | } | |
435 | (*IDs)[0] = atoi (&fromserver[4]); | |
436 | fromserver = index (&fromserver[4], ' '); | |
437 | if (! fromserver) | |
438 | { | |
439 | strcpy (pop_error, | |
440 | "Badly formatted response from server in pop_list"); | |
441 | pop_trash (server); | |
442 | free ((char *) *IDs); | |
443 | free ((char *) *sizes); | |
444 | return (-1); | |
445 | } | |
446 | (*sizes)[0] = atoi (fromserver); | |
447 | (*IDs)[1] = (*sizes)[1] = 0; | |
448 | return (0); | |
449 | } | |
450 | else | |
451 | { | |
452 | if (pop_multi_first (server, "LIST", &fromserver)) | |
453 | { | |
454 | free ((char *) *IDs); | |
455 | free ((char *) *sizes); | |
456 | return (-1); | |
457 | } | |
458 | for (i = 0; i < how_many; i++) | |
459 | { | |
460 | if (pop_multi_next (server, &fromserver)) | |
461 | { | |
462 | free ((char *) *IDs); | |
463 | free ((char *) *sizes); | |
464 | return (-1); | |
465 | } | |
466 | (*IDs)[i] = atoi (fromserver); | |
467 | fromserver = index (fromserver, ' '); | |
468 | if (! fromserver) | |
469 | { | |
470 | strcpy (pop_error, | |
471 | "Badly formatted response from server in pop_list"); | |
472 | free ((char *) *IDs); | |
473 | free ((char *) *sizes); | |
474 | pop_trash (server); | |
475 | return (-1); | |
476 | } | |
477 | (*sizes)[i] = atoi (fromserver); | |
478 | } | |
479 | if (pop_multi_next (server, &fromserver)) | |
480 | { | |
481 | free ((char *) *IDs); | |
482 | free ((char *) *sizes); | |
483 | return (-1); | |
484 | } | |
485 | else if (fromserver) | |
486 | { | |
487 | strcpy (pop_error, | |
488 | "Too many response lines from server in pop_list"); | |
489 | free ((char *) *IDs); | |
490 | free ((char *) *sizes); | |
491 | return (-1); | |
492 | } | |
493 | (*IDs)[i] = (*sizes)[i] = 0; | |
494 | return (0); | |
495 | } | |
496 | } | |
497 | ||
498 | /* | |
499 | * Function: pop_retrieve | |
500 | * | |
501 | * Purpose: Retrieve a specified message from the maildrop. | |
502 | * | |
503 | * Arguments: | |
504 | * server The server to retrieve from. | |
505 | * message The message number to retrieve. | |
506 | * markfrom | |
507 | * If true, then mark the string "From " at the beginning | |
508 | * of lines with '>'. | |
509 | * | |
510 | * Return value: A string pointing to the message, if successful, or | |
511 | * null with pop_error set if not. | |
512 | * | |
513 | * Side effects: May kill connection on error. | |
514 | */ | |
515 | char * | |
516 | pop_retrieve (server, message, markfrom) | |
517 | popserver server; | |
518 | int message; | |
519 | int markfrom; | |
520 | { | |
521 | int *IDs, *sizes, bufsize, fromcount = 0, cp = 0; | |
522 | char *ptr, *fromserver; | |
523 | int ret; | |
524 | ||
525 | if (server->in_multi) | |
526 | { | |
527 | strcpy (pop_error, "In multi-line query in pop_retrieve"); | |
528 | return (0); | |
529 | } | |
530 | ||
531 | if (pop_list (server, message, &IDs, &sizes)) | |
532 | return (0); | |
533 | ||
534 | if (pop_retrieve_first (server, message, &fromserver)) | |
535 | { | |
536 | return (0); | |
537 | } | |
538 | ||
539 | /* | |
540 | * The "5" below is an arbitrary constant -- I assume that if | |
541 | * there are "From" lines in the text to be marked, there | |
542 | * probably won't be more than 5 of them. If there are, I | |
543 | * allocate more space for them below. | |
544 | */ | |
545 | bufsize = sizes[0] + (markfrom ? 5 : 0); | |
546 | ptr = malloc (bufsize); | |
547 | free ((char *) IDs); | |
548 | free ((char *) sizes); | |
549 | ||
550 | if (! ptr) | |
551 | { | |
552 | strcpy (pop_error, "Out of memory in pop_retrieve"); | |
553 | pop_retrieve_flush (server); | |
554 | return (0); | |
555 | } | |
556 | ||
557 | while (! (ret = pop_retrieve_next (server, &fromserver))) | |
558 | { | |
559 | int linesize; | |
560 | ||
561 | if (! fromserver) | |
562 | { | |
563 | ptr[cp] = '\0'; | |
564 | return (ptr); | |
565 | } | |
566 | if (markfrom && fromserver[0] == 'F' && fromserver[1] == 'r' && | |
567 | fromserver[2] == 'o' && fromserver[3] == 'm' && | |
568 | fromserver[4] == ' ') | |
569 | { | |
570 | if (++fromcount == 5) | |
571 | { | |
572 | bufsize += 5; | |
573 | ptr = realloc (ptr, bufsize); | |
574 | if (! ptr) | |
575 | { | |
576 | strcpy (pop_error, "Out of memory in pop_retrieve"); | |
577 | pop_retrieve_flush (server); | |
578 | return (0); | |
579 | } | |
580 | fromcount = 0; | |
581 | } | |
582 | ptr[cp++] = '>'; | |
583 | } | |
584 | linesize = strlen (fromserver); | |
585 | bcopy (fromserver, &ptr[cp], linesize); | |
586 | cp += linesize; | |
587 | ptr[cp++] = '\n'; | |
588 | } | |
589 | ||
590 | if (ret) | |
591 | { | |
592 | free (ptr); | |
593 | return (0); | |
594 | } | |
595 | } | |
596 | ||
597 | int | |
598 | pop_retrieve_first (server, message, response) | |
599 | popserver server; | |
600 | int message; | |
601 | char **response; | |
602 | { | |
603 | sprintf (pop_error, "RETR %d", message); | |
604 | return (pop_multi_first (server, pop_error, response)); | |
605 | } | |
606 | ||
607 | int | |
608 | pop_retrieve_next (server, line) | |
609 | popserver server; | |
610 | char **line; | |
611 | { | |
612 | return (pop_multi_next (server, line)); | |
613 | } | |
614 | ||
615 | int | |
616 | pop_retrieve_flush (server) | |
617 | popserver server; | |
618 | { | |
619 | return (pop_multi_flush (server)); | |
620 | } | |
621 | ||
622 | int | |
623 | pop_top_first (server, message, lines, response) | |
624 | popserver server; | |
625 | int message, lines; | |
626 | char **response; | |
627 | { | |
628 | sprintf (pop_error, "TOP %d %d", message, lines); | |
629 | return (pop_multi_first (server, pop_error, response)); | |
630 | } | |
631 | ||
632 | int | |
633 | pop_top_next (server, line) | |
634 | popserver server; | |
635 | char **line; | |
636 | { | |
637 | return (pop_multi_next (server, line)); | |
638 | } | |
639 | ||
640 | int | |
641 | pop_top_flush (server) | |
642 | popserver server; | |
643 | { | |
644 | return (pop_multi_flush (server)); | |
645 | } | |
646 | ||
647 | int | |
648 | pop_multi_first (server, command, response) | |
649 | popserver server; | |
650 | char *command; | |
651 | char **response; | |
652 | { | |
653 | if (server->in_multi) | |
654 | { | |
655 | strcpy (pop_error, | |
656 | "Already in multi-line query in pop_multi_first"); | |
657 | return (-1); | |
658 | } | |
659 | ||
660 | if (sendline (server, command) || (! (*response = getline (server)))) | |
661 | { | |
662 | return (-1); | |
663 | } | |
664 | ||
665 | if (0 == strncmp (*response, "-ERR", 4)) | |
666 | { | |
667 | strncpy (pop_error, *response, ERROR_MAX); | |
668 | return (-1); | |
669 | } | |
670 | else if (0 == strncmp (*response, "+OK", 3)) | |
671 | { | |
672 | for (*response += 3; **response == ' '; (*response)++) /* empty */; | |
673 | server->in_multi = 1; | |
674 | return (0); | |
675 | } | |
676 | else | |
677 | { | |
678 | strcpy (pop_error, | |
679 | "Unexpected response from server in pop_multi_first"); | |
680 | return (-1); | |
681 | } | |
682 | } | |
683 | ||
684 | int | |
685 | pop_multi_next (server, line) | |
686 | popserver server; | |
687 | char **line; | |
688 | { | |
689 | char *fromserver; | |
690 | ||
691 | if (! server->in_multi) | |
692 | { | |
693 | strcpy (pop_error, "Not in multi-line query in pop_multi_next"); | |
694 | return (-1); | |
695 | } | |
696 | ||
697 | fromserver = getline (server); | |
698 | if (! fromserver) | |
699 | { | |
700 | return (-1); | |
701 | } | |
702 | ||
703 | if (fromserver[0] == '.') | |
704 | { | |
705 | if (! fromserver[1]) | |
706 | { | |
707 | *line = 0; | |
708 | server->in_multi = 0; | |
709 | return (0); | |
710 | } | |
711 | else | |
712 | { | |
713 | *line = fromserver + 1; | |
714 | return (0); | |
715 | } | |
716 | } | |
717 | else | |
718 | { | |
719 | *line = fromserver; | |
720 | return (0); | |
721 | } | |
722 | } | |
723 | ||
724 | int | |
725 | pop_multi_flush (server) | |
726 | popserver server; | |
727 | { | |
728 | char *line; | |
729 | ||
730 | if (! server->in_multi) | |
731 | { | |
732 | return (0); | |
733 | } | |
734 | ||
735 | while (! pop_multi_next (server, &line)) | |
736 | { | |
737 | if (! line) | |
738 | { | |
739 | return (0); | |
740 | } | |
741 | } | |
742 | ||
743 | return (-1); | |
744 | } | |
745 | ||
746 | /* Function: pop_delete | |
747 | * | |
748 | * Purpose: Delete a specified message. | |
749 | * | |
750 | * Arguments: | |
751 | * server Server from which to delete the message. | |
752 | * message Message to delete. | |
753 | * | |
754 | * Return value: 0 on success, non-zero with error in pop_error | |
755 | * otherwise. | |
756 | */ | |
757 | int | |
758 | pop_delete (server, message) | |
759 | popserver server; | |
760 | int message; | |
761 | { | |
762 | if (server->in_multi) | |
763 | { | |
764 | strcpy (pop_error, "In multi-line query in pop_delete"); | |
765 | return (-1); | |
766 | } | |
767 | ||
768 | sprintf (pop_error, "DELE %d", message); | |
769 | ||
770 | if (sendline (server, pop_error) || getok (server)) | |
771 | return (-1); | |
772 | ||
773 | return (0); | |
774 | } | |
775 | ||
776 | /* | |
777 | * Function: pop_noop | |
778 | * | |
779 | * Purpose: Send a noop command to the server. | |
780 | * | |
781 | * Argument: | |
782 | * server The server to send to. | |
783 | * | |
784 | * Return value: 0 on success, non-zero with error in pop_error | |
785 | * otherwise. | |
786 | * | |
787 | * Side effects: Closes connection on error. | |
788 | */ | |
789 | int | |
790 | pop_noop (server) | |
791 | popserver server; | |
792 | { | |
793 | if (server->in_multi) | |
794 | { | |
795 | strcpy (pop_error, "In multi-line query in pop_noop"); | |
796 | return (-1); | |
797 | } | |
798 | ||
799 | if (sendline (server, "NOOP") || getok (server)) | |
800 | return (-1); | |
801 | ||
802 | return (0); | |
803 | } | |
804 | ||
805 | /* | |
806 | * Function: pop_last | |
807 | * | |
808 | * Purpose: Find out the highest seen message from the server. | |
809 | * | |
810 | * Arguments: | |
811 | * server The server. | |
812 | * | |
813 | * Return value: If successful, the highest seen message, which is | |
814 | * greater than or equal to 0. Otherwise, a negative number with | |
815 | * the error explained in pop_error. | |
816 | * | |
817 | * Side effects: Closes the connection on error. | |
818 | */ | |
819 | int | |
820 | pop_last (server) | |
821 | popserver server; | |
822 | { | |
823 | char *fromserver; | |
824 | ||
825 | if (server->in_multi) | |
826 | { | |
827 | strcpy (pop_error, "In multi-line query in pop_last"); | |
828 | return (-1); | |
829 | } | |
830 | ||
831 | if (sendline (server, "LAST")) | |
832 | return (-1); | |
833 | ||
834 | if (! (fromserver = getline (server))) | |
835 | return (-1); | |
836 | ||
837 | if (! strncmp (fromserver, "-ERR", 4)) | |
838 | { | |
839 | strncpy (pop_error, fromserver, ERROR_MAX); | |
840 | return (-1); | |
841 | } | |
842 | else if (strncmp (fromserver, "+OK ", 4)) | |
843 | { | |
844 | strcpy (pop_error, "Unexpected response from server in pop_last"); | |
845 | pop_trash (server); | |
846 | return (-1); | |
847 | } | |
848 | else | |
849 | { | |
850 | return (atoi (&fromserver[4])); | |
851 | } | |
852 | } | |
853 | ||
854 | /* | |
855 | * Function: pop_reset | |
856 | * | |
857 | * Purpose: Reset the server to its initial connect state | |
858 | * | |
859 | * Arguments: | |
860 | * server The server. | |
861 | * | |
862 | * Return value: 0 for success, non-0 with error in pop_error | |
863 | * otherwise. | |
864 | * | |
865 | * Side effects: Closes the connection on error. | |
866 | */ | |
867 | int | |
868 | pop_reset (server) | |
869 | popserver server; | |
870 | { | |
871 | if (pop_retrieve_flush (server)) | |
872 | { | |
873 | return (-1); | |
874 | } | |
875 | ||
876 | if (sendline (server, "RSET") || getok (server)) | |
877 | return (-1); | |
878 | ||
879 | return (0); | |
880 | } | |
881 | ||
882 | /* | |
883 | * Function: pop_quit | |
884 | * | |
885 | * Purpose: Quit the connection to the server, | |
886 | * | |
887 | * Arguments: | |
888 | * server The server to quit. | |
889 | * | |
890 | * Return value: 0 for success, non-zero otherwise with error in | |
891 | * pop_error. | |
892 | * | |
893 | * Side Effects: The popserver passed in is unuseable after this | |
894 | * function is called, even if an error occurs. | |
895 | */ | |
896 | int | |
897 | pop_quit (server) | |
898 | popserver server; | |
899 | { | |
900 | int ret = 0; | |
901 | ||
902 | if (server->file >= 0) | |
903 | { | |
904 | if (pop_retrieve_flush (server)) | |
905 | { | |
906 | ret = -1; | |
907 | } | |
908 | ||
909 | if (sendline (server, "QUIT") || getok (server)) | |
910 | { | |
911 | ret = -1; | |
912 | } | |
913 | ||
914 | close (server->file); | |
915 | } | |
916 | ||
917 | if (server->buffer) | |
918 | free (server->buffer); | |
919 | free ((char *) server); | |
920 | ||
921 | return (ret); | |
922 | } | |
923 | ||
924 | /* | |
925 | * Function: socket_connection | |
926 | * | |
927 | * Purpose: Opens the network connection with the mail host, without | |
928 | * doing any sort of I/O with it or anything. | |
929 | * | |
930 | * Arguments: | |
931 | * host The host to which to connect. | |
932 | * flags Option flags. | |
933 | * | |
934 | * Return value: A file descriptor indicating the connection, or -1 | |
935 | * indicating failure, in which case an error has been copied | |
936 | * into pop_error. | |
937 | */ | |
938 | static int | |
939 | socket_connection (host, flags) | |
940 | char *host; | |
941 | int flags; | |
942 | { | |
943 | struct hostent *hostent; | |
944 | struct servent *servent; | |
945 | struct sockaddr_in addr; | |
946 | char found_port = 0; | |
947 | char *service; | |
948 | int sock; | |
949 | #ifdef KERBEROS | |
950 | #ifdef KRB5 | |
951 | krb5_error_code rem; | |
952 | krb5_ccache ccdef; | |
953 | krb5_principal client, server; | |
954 | krb5_error *err_ret; | |
955 | register char *cp; | |
956 | #else | |
957 | KTEXT ticket; | |
958 | MSG_DAT msg_data; | |
959 | CREDENTIALS cred; | |
960 | Key_schedule schedule; | |
961 | int rem; | |
962 | #endif /* KRB5 */ | |
963 | #endif /* KERBEROS */ | |
964 | ||
965 | int try_count = 0; | |
966 | ||
967 | do | |
968 | { | |
969 | hostent = gethostbyname (host); | |
970 | try_count++; | |
971 | if ((! hostent) && ((h_errno != TRY_AGAIN) || (try_count == 5))) | |
972 | { | |
973 | strcpy (pop_error, "Could not determine POP server's address"); | |
974 | return (-1); | |
975 | } | |
976 | } while (! hostent); | |
977 | ||
978 | bzero ((char *) &addr, sizeof (addr)); | |
979 | addr.sin_family = AF_INET; | |
980 | ||
981 | #ifdef KERBEROS | |
982 | service = (flags & POP_NO_KERBEROS) ? POP_SERVICE : KPOP_SERVICE; | |
983 | #else | |
984 | service = POP_SERVICE; | |
985 | #endif | |
986 | ||
987 | #ifdef HESIOD | |
988 | if (! (flags & POP_NO_HESIOD)) | |
989 | { | |
990 | servent = hes_getservbyname (service, "tcp"); | |
991 | if (servent) | |
992 | { | |
993 | addr.sin_port = servent->s_port; | |
994 | found_port = 1; | |
995 | } | |
996 | } | |
997 | #endif | |
998 | if (! found_port) | |
999 | { | |
1000 | servent = getservbyname (service, "tcp"); | |
1001 | if (servent) | |
1002 | { | |
1003 | addr.sin_port = servent->s_port; | |
1004 | } | |
1005 | else | |
1006 | { | |
1007 | #ifdef KERBEROS | |
1008 | addr.sin_port = htons ((flags & POP_NO_KERBEROS) ? | |
1009 | POP_PORT : KPOP_PORT); | |
1010 | #else | |
1011 | addr.sin_port = htons (POP_PORT); | |
1012 | #endif | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | #define SOCKET_ERROR "Could not create socket for POP connection: " | |
1017 | ||
1018 | sock = socket (PF_INET, SOCK_STREAM, 0); | |
1019 | if (sock < 0) | |
1020 | { | |
1021 | strcpy (pop_error, SOCKET_ERROR); | |
1022 | strncat (pop_error, strerror (errno), | |
1023 | ERROR_MAX - sizeof (SOCKET_ERROR)); | |
1024 | return (-1); | |
1025 | ||
1026 | } | |
1027 | ||
1028 | while (*hostent->h_addr_list) | |
1029 | { | |
1030 | bcopy (*hostent->h_addr_list, (char *) &addr.sin_addr, | |
1031 | hostent->h_length); | |
1032 | if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr))) | |
1033 | break; | |
1034 | hostent->h_addr_list++; | |
1035 | } | |
1036 | ||
1037 | #define CONNECT_ERROR "Could not connect to POP server: " | |
1038 | ||
1039 | if (! *hostent->h_addr_list) | |
1040 | { | |
1041 | (void) close (sock); | |
1042 | strcpy (pop_error, CONNECT_ERROR); | |
1043 | strncat (pop_error, strerror (errno), | |
1044 | ERROR_MAX - sizeof (CONNECT_ERROR)); | |
1045 | return (-1); | |
1046 | ||
1047 | } | |
1048 | ||
1049 | #ifdef KERBEROS | |
1050 | #define KRB_ERROR "Kerberos error connecting to POP server: " | |
1051 | if (! (flags & POP_NO_KERBEROS)) | |
1052 | { | |
1053 | #ifdef KRB5 | |
1054 | krb5_init_ets (); | |
1055 | ||
1056 | if (rem = krb5_cc_default (&ccdef)) | |
1057 | { | |
1058 | krb5error: | |
1059 | strcpy (pop_error, KRB_ERROR); | |
1060 | strncat (pop_error, error_message (rem), | |
1061 | ERROR_MAX - sizeof(KRB_ERROR)); | |
1062 | (void) close (sock); | |
1063 | return (-1); | |
1064 | } | |
1065 | ||
1066 | if (rem = krb5_cc_get_principal (ccdef, &client)) | |
1067 | { | |
1068 | goto krb5error; | |
1069 | } | |
1070 | ||
1071 | for (cp = hostent->h_name; *cp; cp++) | |
1072 | { | |
1073 | if (isupper (*cp)) | |
1074 | { | |
1075 | *cp = tolower (*cp); | |
1076 | } | |
1077 | } | |
1078 | ||
1079 | if (rem = krb5_sname_to_principal (hostent->h_name, POP_SERVICE, | |
1080 | FALSE, &server)) | |
1081 | { | |
1082 | goto krb5error; | |
1083 | } | |
1084 | ||
1085 | rem = krb5_sendauth ((krb5_pointer) &sock, "KPOPV1.0", client, server, | |
1086 | AP_OPTS_MUTUAL_REQUIRED, | |
1087 | 0, /* no checksum */ | |
1088 | 0, /* no creds, use ccache instead */ | |
1089 | ccdef, | |
1090 | 0, /* don't need seq # */ | |
1091 | 0, /* don't need subsession key */ | |
1092 | &err_ret, | |
1093 | 0); /* don't need reply */ | |
1094 | krb5_free_principal (server); | |
1095 | if (rem) | |
1096 | { | |
1097 | if (err_ret && err_ret->text.length) | |
1098 | { | |
1099 | strcpy (pop_error, KRB_ERROR); | |
1100 | strncat (pop_error, error_message (rem), | |
1101 | ERROR_MAX - sizeof (KRB_ERROR)); | |
1102 | strncat (pop_error, " [server says '", | |
1103 | ERROR_MAX - strlen (pop_error) - 1); | |
1104 | strncat (pop_error, err_ret->text.data, | |
1105 | min (ERROR_MAX - strlen (pop_error) - 1, | |
1106 | err_ret->text.length)); | |
1107 | strncat (pop_error, "']", | |
1108 | ERROR_MAX - strlen (pop_error) - 1); | |
1109 | } | |
1110 | else | |
1111 | { | |
1112 | strcpy (pop_error, KRB_ERROR); | |
1113 | strncat (pop_error, error_message (rem), | |
1114 | ERROR_MAX - sizeof (KRB_ERROR)); | |
1115 | } | |
1116 | if (err_ret) | |
1117 | krb5_free_error (err_ret); | |
1118 | ||
1119 | (void) close (sock); | |
1120 | return (-1); | |
1121 | } | |
1122 | #else /* ! KRB5 */ | |
1123 | ticket = (KTEXT) malloc (sizeof (KTEXT_ST)); | |
1124 | rem = krb_sendauth (0L, sock, ticket, "pop", hostent->h_name, | |
1125 | (char *) krb_realmofhost (hostent->h_name), | |
1126 | (unsigned long) 0, &msg_data, &cred, schedule, | |
1127 | (struct sockaddr_in *) 0, | |
1128 | (struct sockaddr_in *) 0, | |
1129 | "KPOPV0.1"); | |
1130 | free ((char *) ticket); | |
1131 | if (rem != KSUCCESS) | |
1132 | { | |
1133 | strcpy (pop_error, KRB_ERROR); | |
1134 | strncat (pop_error, krb_err_txt[rem], | |
1135 | ERROR_MAX - sizeof (KRB_ERROR)); | |
1136 | (void) close (sock); | |
1137 | return (-1); | |
1138 | } | |
1139 | #endif /* KRB5 */ | |
1140 | } | |
1141 | #endif /* KERBEROS */ | |
1142 | ||
1143 | return (sock); | |
1144 | } /* socket_connection */ | |
1145 | ||
1146 | /* | |
1147 | * Function: getline | |
1148 | * | |
1149 | * Purpose: Get a line of text from the connection and return a | |
1150 | * pointer to it. The carriage return and linefeed at the end of | |
1151 | * the line are stripped, but periods at the beginnings of lines | |
1152 | * are NOT dealt with in any special way. | |
1153 | * | |
1154 | * Arguments: | |
1155 | * server The server from which to get the line of text. | |
1156 | * | |
1157 | * Returns: A non-null pointer if successful, or a null pointer on any | |
1158 | * error, with an error message copied into pop_error. | |
1159 | * | |
1160 | * Notes: The line returned is overwritten with each call to getline. | |
1161 | * | |
1162 | * Side effects: Closes the connection on error. | |
1163 | */ | |
1164 | static char * | |
1165 | getline (server) | |
1166 | popserver server; | |
1167 | { | |
1168 | #define GETLINE_ERROR "Error reading from server: " | |
1169 | ||
1170 | int ret; | |
1171 | ||
1172 | if (server->data) | |
1173 | { | |
1174 | char *cp = strstr (server->buffer + server->buffer_index, "\r\n"); | |
1175 | if (cp) | |
1176 | { | |
1177 | int found; | |
1178 | int data_used; | |
1179 | ||
1180 | found = server->buffer_index; | |
1181 | data_used = (cp + 2) - server->buffer - found; | |
1182 | ||
1183 | *cp = '\0'; /* terminate the string to be returned */ | |
1184 | server->data -= data_used; | |
1185 | server->buffer_index += data_used; | |
1186 | ||
1187 | if (pop_debug) | |
1188 | fprintf (stderr, "<<< %s\n", server->buffer + found); | |
1189 | return (server->buffer + found); | |
1190 | } | |
1191 | else | |
1192 | { | |
1193 | bcopy (server->buffer + server->buffer_index, | |
1194 | server->buffer, server->data); | |
1195 | server->buffer_index = 0; | |
1196 | } | |
1197 | } | |
1198 | else | |
1199 | { | |
1200 | server->buffer_index = 0; | |
1201 | } | |
1202 | ||
1203 | while (1) | |
1204 | { | |
1205 | if (server->data == server->buffer_size) | |
1206 | { | |
1207 | server->buffer_size += GETLINE_INCR; | |
1208 | server->buffer = realloc (server->buffer, server->buffer_size); | |
1209 | if (! server->buffer) | |
1210 | { | |
1211 | strcpy (pop_error, "Out of memory in getline"); | |
1212 | pop_trash (server); | |
1213 | return (0); | |
1214 | } | |
1215 | } | |
1216 | ret = read (server->file, server->buffer + server->data, | |
1217 | server->buffer_size - server->data); | |
1218 | if (ret < 0) | |
1219 | { | |
1220 | strcpy (pop_error, GETLINE_ERROR); | |
1221 | strncat (pop_error, strerror (errno), | |
1222 | ERROR_MAX - sizeof (GETLINE_ERROR)); | |
1223 | pop_trash (server); | |
1224 | return (0); | |
1225 | } | |
1226 | else if (ret == 0) | |
1227 | { | |
1228 | strcpy (pop_error, "Unexpected EOF from server in getline"); | |
1229 | pop_trash (server); | |
1230 | return (0); | |
1231 | } | |
1232 | else | |
1233 | { | |
1234 | char *cp = strstr (server->buffer, "\r\n"); | |
1235 | server->data += ret; | |
1236 | ||
1237 | if (cp) | |
1238 | { | |
1239 | int data_used = (cp + 2) - server->buffer; | |
1240 | *cp = '\0'; | |
1241 | server->data -= data_used; | |
1242 | server->buffer_index = data_used; | |
1243 | ||
1244 | if (pop_debug) | |
1245 | fprintf (stderr, "<<< %s\n", server->buffer); | |
1246 | return (server->buffer); | |
1247 | } | |
1248 | } | |
1249 | } | |
1250 | ||
1251 | /* NOTREACHED */ | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Function: sendline | |
1256 | * | |
1257 | * Purpose: Sends a line of text to the POP server. The line of text | |
1258 | * passed into this function should NOT have the carriage return | |
1259 | * and linefeed on the end of it. Periods at beginnings of lines | |
1260 | * will NOT be treated specially by this function. | |
1261 | * | |
1262 | * Arguments: | |
1263 | * server The server to which to send the text. | |
1264 | * line The line of text to send. | |
1265 | * | |
1266 | * Return value: Upon successful completion, a value of 0 will be | |
1267 | * returned. Otherwise, a non-zero value will be returned, and | |
1268 | * an error will be copied into pop_error. | |
1269 | * | |
1270 | * Side effects: Closes the connection on error. | |
1271 | */ | |
1272 | static int | |
1273 | sendline (server, line) | |
1274 | popserver server; | |
1275 | char *line; | |
1276 | { | |
1277 | #define SENDLINE_ERROR "Error writing to POP server: " | |
1278 | int ret; | |
1279 | ||
1280 | ret = fullwrite (server->file, line, strlen (line)); | |
1281 | if (ret >= 0) | |
1282 | { /* 0 indicates that a blank line was written */ | |
1283 | ret = fullwrite (server->file, "\r\n", 2); | |
1284 | } | |
1285 | ||
1286 | if (ret < 0) | |
1287 | { | |
1288 | pop_trash (server); | |
1289 | strcpy (pop_error, SENDLINE_ERROR); | |
1290 | strncat (pop_error, strerror (errno), | |
1291 | ERROR_MAX - sizeof (SENDLINE_ERROR)); | |
1292 | return (ret); | |
1293 | } | |
1294 | ||
1295 | if (pop_debug) | |
1296 | fprintf (stderr, ">>> %s\n", line); | |
1297 | ||
1298 | return (0); | |
1299 | } | |
1300 | ||
1301 | /* | |
1302 | * Procedure: fullwrite | |
1303 | * | |
1304 | * Purpose: Just like write, but keeps trying until the entire string | |
1305 | * has been written. | |
1306 | * | |
1307 | * Return value: Same as write. Pop_error is not set. | |
1308 | */ | |
1309 | static int | |
1310 | fullwrite (fd, buf, nbytes) | |
1311 | int fd; | |
1312 | char *buf; | |
1313 | int nbytes; | |
1314 | { | |
1315 | char *cp; | |
1316 | int ret; | |
1317 | ||
1318 | cp = buf; | |
1319 | while ((ret = write (fd, cp, nbytes)) > 0) | |
1320 | { | |
1321 | cp += ret; | |
1322 | nbytes -= ret; | |
1323 | } | |
1324 | ||
1325 | return (ret); | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * Procedure getok | |
1330 | * | |
1331 | * Purpose: Reads a line from the server. If the return indicator is | |
1332 | * positive, return with a zero exit status. If not, return with | |
1333 | * a negative exit status. | |
1334 | * | |
1335 | * Arguments: | |
1336 | * server The server to read from. | |
1337 | * | |
1338 | * Returns: 0 for success, else for failure and puts error in pop_error. | |
1339 | * | |
1340 | * Side effects: On failure, may make the connection unuseable. | |
1341 | */ | |
1342 | static int | |
1343 | getok (server) | |
1344 | popserver server; | |
1345 | { | |
1346 | char *fromline; | |
1347 | ||
1348 | if (! (fromline = getline (server))) | |
1349 | { | |
1350 | return (-1); | |
1351 | } | |
1352 | ||
1353 | if (! strncmp (fromline, "+OK", 3)) | |
1354 | return (0); | |
1355 | else if (! strncmp (fromline, "-ERR", 4)) | |
1356 | { | |
1357 | strncpy (pop_error, fromline, ERROR_MAX); | |
1358 | pop_error[ERROR_MAX-1] = '\0'; | |
1359 | return (-1); | |
1360 | } | |
1361 | else | |
1362 | { | |
1363 | strcpy (pop_error, | |
1364 | "Unexpected response from server; expecting +OK or -ERR"); | |
1365 | pop_trash (server); | |
1366 | return (-1); | |
1367 | } | |
1368 | } | |
1369 | ||
1370 | #if 0 | |
1371 | /* | |
1372 | * Function: gettermination | |
1373 | * | |
1374 | * Purpose: Gets the next line and verifies that it is a termination | |
1375 | * line (nothing but a dot). | |
1376 | * | |
1377 | * Return value: 0 on success, non-zero with pop_error set on error. | |
1378 | * | |
1379 | * Side effects: Closes the connection on error. | |
1380 | */ | |
1381 | static int | |
1382 | gettermination (server) | |
1383 | popserver server; | |
1384 | { | |
1385 | char *fromserver; | |
1386 | ||
1387 | fromserver = getline (server); | |
1388 | if (! fromserver) | |
1389 | return (-1); | |
1390 | ||
1391 | if (strcmp (fromserver, ".")) | |
1392 | { | |
1393 | strcpy (pop_error, | |
1394 | "Unexpected response from server in gettermination"); | |
1395 | pop_trash (server); | |
1396 | return (-1); | |
1397 | } | |
1398 | ||
1399 | return (0); | |
1400 | } | |
1401 | #endif | |
1402 | ||
1403 | /* | |
1404 | * Function pop_close | |
1405 | * | |
1406 | * Purpose: Close a pop connection, sending a "RSET" command to try to | |
1407 | * preserve any changes that were made and a "QUIT" command to | |
1408 | * try to get the server to quit, but ignoring any responses that | |
1409 | * are received. | |
1410 | * | |
1411 | * Side effects: The server is unuseable after this function returns. | |
1412 | * Changes made to the maildrop since the session was started (or | |
1413 | * since the last pop_reset) may be lost. | |
1414 | */ | |
1415 | void | |
1416 | pop_close (server) | |
1417 | popserver server; | |
1418 | { | |
1419 | pop_trash (server); | |
1420 | free ((char *) server); | |
1421 | ||
1422 | return; | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * Function: pop_trash | |
1427 | * | |
1428 | * Purpose: Like pop_close or pop_quit, but doesn't deallocate the | |
1429 | * memory associated with the server. It is legal to call | |
1430 | * pop_close or pop_quit after this function has been called. | |
1431 | */ | |
1432 | static void | |
1433 | pop_trash (server) | |
1434 | popserver server; | |
1435 | { | |
1436 | if (server->file >= 0) | |
1437 | { | |
1438 | sendline (server, "RSET"); | |
1439 | sendline (server, "QUIT"); | |
1440 | ||
1441 | close (server->file); | |
1442 | server->file = -1; | |
1443 | if (server->buffer) | |
1444 | { | |
1445 | free (server->buffer); | |
1446 | server->buffer = 0; | |
1447 | } | |
1448 | } | |
1449 | } | |
1450 | ||
1451 | /* Search in STRING for an occurrence of SUBSTRING | |
1452 | and return a pointer to that occurrence. | |
1453 | Return 0 if SUBSTRING does not occur in STRING. */ | |
1454 | ||
1455 | static char * | |
1456 | my_strstr (string, substring) | |
1457 | char *string, *substring; | |
1458 | { | |
1459 | char *p = string; | |
1460 | ||
1461 | while (*p) | |
1462 | { | |
1463 | if (!strcmp (p, substring)) | |
1464 | return p; | |
1465 | p++; | |
1466 | } | |
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | #endif /* MAIL_USE_POP */ |