Commit | Line | Data |
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c988f1f4 | 1 | /* $Cambridge: exim/src/src/receive.c,v 1.9 2005/01/04 10:00:42 ph10 Exp $ */ |
059ec3d9 PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
c988f1f4 | 7 | /* Copyright (c) University of Cambridge 1995 - 2005 */ |
059ec3d9 PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | /* Code for receiving a message and setting up spool files. */ | |
11 | ||
12 | ||
13 | #include "exim.h" | |
14 | ||
15 | ||
16 | ||
17 | /************************************************* | |
18 | * Local static variables * | |
19 | *************************************************/ | |
20 | ||
21 | static FILE *data_file = NULL; | |
22 | static int data_fd = -1; | |
23 | static uschar spool_name[256]; | |
24 | ||
25 | ||
26 | ||
27 | /************************************************* | |
28 | * Non-SMTP character reading functions * | |
29 | *************************************************/ | |
30 | ||
31 | /* These are the default functions that are set up in the variables such as | |
32 | receive_getc initially. They just call the standard functions, passing stdin as | |
33 | the file. (When SMTP input is occurring, different functions are used by | |
34 | changing the pointer variables.) */ | |
35 | ||
36 | int | |
37 | stdin_getc(void) | |
38 | { | |
39 | return getc(stdin); | |
40 | } | |
41 | ||
42 | int | |
43 | stdin_ungetc(int c) | |
44 | { | |
45 | return ungetc(c, stdin); | |
46 | } | |
47 | ||
48 | int | |
49 | stdin_feof(void) | |
50 | { | |
51 | return feof(stdin); | |
52 | } | |
53 | ||
54 | int | |
55 | stdin_ferror(void) | |
56 | { | |
57 | return ferror(stdin); | |
58 | } | |
59 | ||
60 | ||
61 | ||
62 | ||
63 | /************************************************* | |
64 | * Check that a set sender is allowed * | |
65 | *************************************************/ | |
66 | ||
67 | /* This function is called when a local caller sets an explicit sender address. | |
68 | It checks whether this is permitted, which it is for trusted callers. | |
69 | Otherwise, it must match the pattern(s) in untrusted_set_sender. | |
70 | ||
71 | Arguments: the proposed sender address | |
72 | Returns: TRUE for a trusted caller | |
73 | TRUE if the address has been set, untrusted_set_sender has been | |
74 | set, and the address matches something in the list | |
75 | FALSE otherwise | |
76 | */ | |
77 | ||
78 | BOOL | |
79 | receive_check_set_sender(uschar *newsender) | |
80 | { | |
81 | uschar *qnewsender; | |
82 | if (trusted_caller) return TRUE; | |
83 | if (newsender == NULL || untrusted_set_sender == NULL) return FALSE; | |
84 | qnewsender = (Ustrchr(newsender, '@') != NULL)? | |
85 | newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender); | |
86 | return | |
87 | match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1, | |
88 | 0, NULL) == OK; | |
89 | } | |
90 | ||
91 | ||
92 | ||
93 | ||
94 | /************************************************* | |
5cb8cbc6 | 95 | * Read space info for a partition * |
059ec3d9 PH |
96 | *************************************************/ |
97 | ||
5cb8cbc6 PH |
98 | /* This function is called by receive_check_fs() below, and also by string |
99 | expansion for variables such as $spool_space. The field names for the statvfs | |
100 | structure are macros, because not all OS have F_FAVAIL and it seems tidier to | |
101 | have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not | |
102 | have inodes, and they return -1 for the number available. | |
059ec3d9 | 103 | |
5cb8cbc6 PH |
104 | Later: It turns out that some file systems that do not have the concept of |
105 | inodes return 0 rather than -1. Such systems should also return 0 for the total | |
106 | number of inodes, so we require that to be greater than zero before returning | |
107 | an inode count. | |
059ec3d9 | 108 | |
5cb8cbc6 PH |
109 | Arguments: |
110 | isspool TRUE for spool partition, FALSE for log partition | |
111 | inodeptr address of int to receive inode count; -1 if there isn't one | |
112 | ||
113 | Returns: available on-root space, in kilobytes | |
114 | -1 for log partition if there isn't one | |
115 | ||
116 | All values are -1 if the STATFS functions are not available. | |
059ec3d9 PH |
117 | */ |
118 | ||
5cb8cbc6 PH |
119 | int |
120 | receive_statvfs(BOOL isspool, int *inodeptr) | |
059ec3d9 PH |
121 | { |
122 | #ifdef HAVE_STATFS | |
059ec3d9 | 123 | struct STATVFS statbuf; |
5cb8cbc6 PH |
124 | uschar *path; |
125 | uschar *name; | |
126 | uschar buffer[1024]; | |
059ec3d9 | 127 | |
5cb8cbc6 | 128 | /* The spool directory must always exist. */ |
059ec3d9 | 129 | |
5cb8cbc6 | 130 | if (isspool) |
059ec3d9 | 131 | { |
5cb8cbc6 PH |
132 | path = spool_directory; |
133 | name = US"spool"; | |
134 | } | |
135 | ||
059ec3d9 PH |
136 | /* Need to cut down the log file path to the directory, and to ignore any |
137 | appearance of "syslog" in it. */ | |
138 | ||
5cb8cbc6 | 139 | else |
059ec3d9 | 140 | { |
059ec3d9 | 141 | int sep = ':'; /* Not variable - outside scripts use */ |
059ec3d9 | 142 | uschar *p = log_file_path; |
5cb8cbc6 | 143 | name = US"log"; |
059ec3d9 PH |
144 | |
145 | /* An empty log_file_path means "use the default". This is the same as an | |
146 | empty item in a list. */ | |
147 | ||
148 | if (*p == 0) p = US":"; | |
149 | while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL) | |
150 | { | |
151 | if (Ustrcmp(path, "syslog") != 0) break; | |
152 | } | |
153 | ||
5cb8cbc6 PH |
154 | if (path == NULL) /* No log files */ |
155 | { | |
156 | *inodeptr = -1; | |
157 | return -1; | |
158 | } | |
059ec3d9 | 159 | |
5cb8cbc6 PH |
160 | /* An empty string means use the default, which is in the spool directory. |
161 | But don't just use the spool directory, as it is possible that the log | |
162 | subdirectory has been symbolically linked elsewhere. */ | |
059ec3d9 | 163 | |
5cb8cbc6 | 164 | if (path[0] == 0) |
059ec3d9 | 165 | { |
5cb8cbc6 PH |
166 | sprintf(CS buffer, CS"%s/log", CS spool_directory); |
167 | path = buffer; | |
168 | } | |
169 | else | |
059ec3d9 | 170 | { |
5cb8cbc6 PH |
171 | uschar *cp; |
172 | if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0; | |
173 | } | |
174 | } | |
175 | ||
176 | /* We now have the patch; do the business */ | |
177 | ||
178 | memset(&statbuf, 0, sizeof(statbuf)); | |
179 | ||
180 | if (STATVFS(CS path, &statbuf) != 0) | |
181 | { | |
182 | log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat " | |
183 | "%s directory %s: %s", name, spool_directory, strerror(errno)); | |
184 | smtp_closedown(US"spool or log directory problem"); | |
185 | exim_exit(EXIT_FAILURE); | |
186 | } | |
187 | ||
188 | *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1; | |
189 | ||
190 | /* Disks are getting huge. Take care with computing the size in kilobytes. */ | |
191 | ||
192 | return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0); | |
193 | ||
194 | /* Unable to find partition sizes in this environment. */ | |
195 | ||
196 | #else | |
197 | *inodeptr = -1; | |
198 | return -1; | |
199 | #endif | |
200 | } | |
201 | ||
059ec3d9 | 202 | |
059ec3d9 | 203 | |
5cb8cbc6 PH |
204 | |
205 | /************************************************* | |
206 | * Check space on spool and log partitions * | |
207 | *************************************************/ | |
208 | ||
209 | /* This function is called before accepting a message; if any thresholds are | |
210 | set, it checks them. If a message_size is supplied, it checks that there is | |
211 | enough space for that size plus the threshold - i.e. that the message won't | |
212 | reduce the space to the threshold. Not all OS have statvfs(); for those that | |
213 | don't, this function always returns TRUE. For some OS the old function and | |
214 | struct name statfs is used; that is handled by a macro, defined in exim.h. | |
215 | ||
216 | Arguments: | |
217 | msg_size the (estimated) size of an incoming message | |
218 | ||
219 | Returns: FALSE if there isn't enough space, or if the information cannot | |
220 | be obtained | |
221 | TRUE if no check was done or there is enough space | |
222 | */ | |
223 | ||
224 | BOOL | |
225 | receive_check_fs(int msg_size) | |
226 | { | |
227 | int space, inodes; | |
228 | ||
229 | if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0) | |
230 | { | |
231 | space = receive_statvfs(TRUE, &inodes); | |
232 | ||
059ec3d9 | 233 | DEBUG(D_receive) |
5cb8cbc6 PH |
234 | debug_printf("spool directory space = %dK inodes = %d " |
235 | "check_space = %dK inodes = %d msg_size = %d\n", | |
236 | space, inodes, check_spool_space, check_spool_inodes, msg_size); | |
237 | ||
238 | if ((space >= 0 && space < check_spool_space) || | |
239 | (inodes >= 0 && inodes < check_spool_inodes)) | |
240 | { | |
241 | log_write(0, LOG_MAIN, "spool directory space check failed: space=%d " | |
242 | "inodes=%d", space, inodes); | |
059ec3d9 PH |
243 | return FALSE; |
244 | } | |
245 | } | |
246 | ||
5cb8cbc6 PH |
247 | if (check_log_space > 0 || check_log_inodes > 0) |
248 | { | |
249 | space = receive_statvfs(FALSE, &inodes); | |
250 | ||
251 | DEBUG(D_receive) | |
252 | debug_printf("log directory space = %dK inodes = %d " | |
253 | "check_space = %dK inodes = %d\n", | |
254 | space, inodes, check_log_space, check_log_inodes); | |
255 | ||
256 | if ((space >= 0 && space < check_log_space) || | |
257 | (inodes >= 0 && inodes < check_log_inodes)) | |
258 | { | |
259 | log_write(0, LOG_MAIN, "log directory space check failed: space=%d " | |
260 | "inodes=%d", space, inodes); | |
261 | return FALSE; | |
262 | } | |
263 | } | |
264 | ||
059ec3d9 PH |
265 | return TRUE; |
266 | } | |
267 | ||
268 | ||
269 | ||
270 | /************************************************* | |
271 | * Bomb out while reading a message * | |
272 | *************************************************/ | |
273 | ||
274 | /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is | |
275 | received, or if there is a timeout. A rarer case might be if the log files are | |
276 | screwed up and Exim can't open them to record a message's arrival. Handling | |
277 | that case is done by setting a flag to cause the log functions to call this | |
278 | function if there is an ultimate disaster. That is why it is globally | |
279 | accessible. | |
280 | ||
281 | Arguments: SMTP response to give if in an SMTP session | |
282 | Returns: it doesn't | |
283 | */ | |
284 | ||
285 | void | |
286 | receive_bomb_out(uschar *msg) | |
287 | { | |
288 | /* If spool_name is set, it contains the name of the data file that is being | |
289 | written. Unlink it before closing so that it cannot be picked up by a delivery | |
290 | process. Ensure that any header file is also removed. */ | |
291 | ||
292 | if (spool_name[0] != 0) | |
293 | { | |
294 | Uunlink(spool_name); | |
295 | spool_name[Ustrlen(spool_name) - 1] = 'H'; | |
296 | Uunlink(spool_name); | |
297 | } | |
298 | ||
299 | /* Now close the file if it is open, either as a fd or a stream. */ | |
300 | ||
301 | if (data_file != NULL) fclose(data_file); | |
302 | else if (data_fd >= 0) close(data_fd); | |
303 | ||
304 | /* Attempt to close down an SMTP connection tidily. */ | |
305 | ||
306 | if (smtp_input) | |
307 | { | |
308 | if (!smtp_batched_input) | |
309 | { | |
310 | smtp_printf("421 %s %s - closing connection.\r\n", smtp_active_hostname, | |
311 | msg); | |
312 | mac_smtp_fflush(); | |
313 | } | |
314 | ||
315 | /* Control does not return from moan_smtp_batch(). */ | |
316 | ||
317 | else moan_smtp_batch(NULL, "421 %s - message abandoned", msg); | |
318 | } | |
319 | ||
320 | /* Exit from the program (non-BSMTP cases) */ | |
321 | ||
322 | exim_exit(EXIT_FAILURE); | |
323 | } | |
324 | ||
325 | ||
326 | /************************************************* | |
327 | * Data read timeout * | |
328 | *************************************************/ | |
329 | ||
330 | /* Handler function for timeouts that occur while reading the data that | |
331 | comprises a message. | |
332 | ||
333 | Argument: the signal number | |
334 | Returns: nothing | |
335 | */ | |
336 | ||
337 | static void | |
338 | data_timeout_handler(int sig) | |
339 | { | |
340 | uschar *msg = NULL; | |
341 | ||
342 | sig = sig; /* Keep picky compilers happy */ | |
343 | ||
344 | if (smtp_input) | |
345 | { | |
346 | msg = US"SMTP incoming data timeout"; | |
347 | log_write(L_lost_incoming_connection, | |
348 | LOG_MAIN, "SMTP data timeout (message abandoned) on connection " | |
349 | "from %s", | |
350 | (sender_fullhost != NULL)? sender_fullhost : US"local process"); | |
351 | } | |
352 | else | |
353 | { | |
354 | fprintf(stderr, "exim: timed out while reading - message abandoned\n"); | |
355 | log_write(L_lost_incoming_connection, | |
356 | LOG_MAIN, "timed out while reading local message"); | |
357 | } | |
358 | ||
359 | receive_bomb_out(msg); /* Does not return */ | |
360 | } | |
361 | ||
362 | ||
363 | ||
364 | /************************************************* | |
365 | * local_scan() timeout * | |
366 | *************************************************/ | |
367 | ||
368 | /* Handler function for timeouts that occur while running a local_scan() | |
369 | function. | |
370 | ||
371 | Argument: the signal number | |
372 | Returns: nothing | |
373 | */ | |
374 | ||
375 | static void | |
376 | local_scan_timeout_handler(int sig) | |
377 | { | |
378 | sig = sig; /* Keep picky compilers happy */ | |
379 | log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - " | |
380 | "message temporarily rejected (size %d)", message_size); | |
381 | receive_bomb_out(US"local verification problem"); /* Does not return */ | |
382 | } | |
383 | ||
384 | ||
385 | ||
386 | /************************************************* | |
387 | * local_scan() crashed * | |
388 | *************************************************/ | |
389 | ||
390 | /* Handler function for signals that occur while running a local_scan() | |
391 | function. | |
392 | ||
393 | Argument: the signal number | |
394 | Returns: nothing | |
395 | */ | |
396 | ||
397 | static void | |
398 | local_scan_crash_handler(int sig) | |
399 | { | |
400 | log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with " | |
401 | "signal %d - message temporarily rejected (size %d)", sig, message_size); | |
402 | receive_bomb_out(US"local verification problem"); /* Does not return */ | |
403 | } | |
404 | ||
405 | ||
406 | /************************************************* | |
407 | * SIGTERM or SIGINT received * | |
408 | *************************************************/ | |
409 | ||
410 | /* Handler for SIGTERM or SIGINT signals that occur while reading the | |
411 | data that comprises a message. | |
412 | ||
413 | Argument: the signal number | |
414 | Returns: nothing | |
415 | */ | |
416 | ||
417 | static void | |
418 | data_sigterm_sigint_handler(int sig) | |
419 | { | |
420 | uschar *msg = NULL; | |
421 | ||
422 | if (smtp_input) | |
423 | { | |
424 | msg = US"Service not available - SIGTERM or SIGINT received"; | |
425 | log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(), | |
426 | (sig == SIGTERM)? "SIGTERM" : "SIGINT"); | |
427 | } | |
428 | else | |
429 | { | |
f05da2e8 | 430 | if (filter_test == FTEST_NONE) |
059ec3d9 PH |
431 | { |
432 | fprintf(stderr, "\nexim: %s received - message abandoned\n", | |
433 | (sig == SIGTERM)? "SIGTERM" : "SIGINT"); | |
434 | log_write(0, LOG_MAIN, "%s received while reading local message", | |
435 | (sig == SIGTERM)? "SIGTERM" : "SIGINT"); | |
436 | } | |
437 | } | |
438 | ||
439 | receive_bomb_out(msg); /* Does not return */ | |
440 | } | |
441 | ||
442 | ||
443 | ||
444 | /************************************************* | |
445 | * Add new recipient to list * | |
446 | *************************************************/ | |
447 | ||
448 | /* This function builds a list of recipient addresses in argc/argv | |
449 | format. | |
450 | ||
451 | Arguments: | |
452 | recipient the next address to add to recipients_list | |
453 | pno parent number for fixed aliases; -1 otherwise | |
454 | ||
455 | Returns: nothing | |
456 | */ | |
457 | ||
458 | void | |
459 | receive_add_recipient(uschar *recipient, int pno) | |
460 | { | |
461 | if (recipients_count >= recipients_list_max) | |
462 | { | |
463 | recipient_item *oldlist = recipients_list; | |
464 | int oldmax = recipients_list_max; | |
465 | recipients_list_max = recipients_list_max? 2*recipients_list_max : 50; | |
466 | recipients_list = store_get(recipients_list_max * sizeof(recipient_item)); | |
467 | if (oldlist != NULL) | |
468 | memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item)); | |
469 | } | |
470 | ||
471 | recipients_list[recipients_count].address = recipient; | |
472 | recipients_list[recipients_count].pno = pno; | |
8523533c TK |
473 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
474 | recipients_list[recipients_count].bmi_optin = bmi_current_optin; | |
475 | /* reset optin string pointer for next recipient */ | |
476 | bmi_current_optin = NULL; | |
477 | #endif | |
059ec3d9 PH |
478 | recipients_list[recipients_count++].errors_to = NULL; |
479 | } | |
480 | ||
481 | ||
482 | ||
483 | ||
484 | /************************************************* | |
485 | * Remove a recipient from the list * | |
486 | *************************************************/ | |
487 | ||
488 | /* This function is provided for local_scan() to use. | |
489 | ||
490 | Argument: | |
491 | recipient address to remove | |
492 | ||
493 | Returns: TRUE if it did remove something; FALSE otherwise | |
494 | */ | |
495 | ||
496 | BOOL | |
497 | receive_remove_recipient(uschar *recipient) | |
498 | { | |
499 | int count; | |
500 | DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n", | |
501 | recipient); | |
502 | for (count = 0; count < recipients_count; count++) | |
503 | { | |
504 | if (Ustrcmp(recipients_list[count].address, recipient) == 0) | |
505 | { | |
506 | if ((--recipients_count - count) > 0) | |
507 | memmove(recipients_list + count, recipients_list + count + 1, | |
508 | (recipients_count - count)*sizeof(recipient_item)); | |
509 | return TRUE; | |
510 | } | |
511 | } | |
512 | return FALSE; | |
513 | } | |
514 | ||
515 | ||
516 | ||
517 | ||
518 | ||
519 | /************************************************* | |
520 | * Read data portion of a non-SMTP message * | |
521 | *************************************************/ | |
522 | ||
523 | /* This function is called to read the remainder of a message (following the | |
524 | header) when the input is not from SMTP - we are receiving a local message on | |
525 | a standard input stream. The message is always terminated by EOF, and is also | |
526 | terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the | |
527 | two cases for maximum efficiency. | |
528 | ||
529 | Ensure that the body ends with a newline. This will naturally be the case when | |
530 | the termination is "\n.\n" but may not be otherwise. The RFC defines messages | |
531 | as "sequences of lines" - this of course strictly applies only to SMTP, but | |
532 | deliveries into BSD-type mailbox files also require it. Exim used to have a | |
533 | flag for doing this at delivery time, but as it was always set for all | |
534 | transports, I decided to simplify things by putting the check here instead. | |
535 | ||
536 | There is at least one MUA (dtmail) that sends CRLF via this interface, and | |
537 | other programs are known to do this as well. Exim used to have a option for | |
538 | dealing with this: in July 2003, after much discussion, the code has been | |
539 | changed to default to treat any of LF, CRLF, and bare CR as line terminators. | |
540 | ||
541 | However, for the case when a dot on a line by itself terminates a message, the | |
542 | only recognized terminating sequences before and after the dot are LF and CRLF. | |
543 | Otherwise, having read EOL . CR, you don't know whether to read another | |
544 | character or not. | |
545 | ||
546 | Internally, in messages stored in Exim's spool files, LF is used as the line | |
547 | terminator. Under the new regime, bare CRs will no longer appear in these | |
548 | files. | |
549 | ||
550 | Arguments: | |
551 | fout a FILE to which to write the message | |
552 | ||
553 | Returns: One of the END_xxx values indicating why it stopped reading | |
554 | */ | |
555 | ||
556 | static int | |
557 | read_message_data(FILE *fout) | |
558 | { | |
559 | int ch_state; | |
560 | register int ch; | |
561 | ||
562 | /* Handle the case when only EOF terminates the message */ | |
563 | ||
564 | if (!dot_ends) | |
565 | { | |
566 | register int last_ch = '\n'; | |
567 | ||
568 | for (; (ch = (receive_getc)()) != EOF; last_ch = ch) | |
569 | { | |
570 | if (ch == 0) body_zerocount++; | |
571 | if (last_ch == '\r' && ch != '\n') | |
572 | { | |
573 | if (fputc('\n', fout) == EOF) return END_WERROR; | |
574 | message_size++; | |
575 | body_linecount++; | |
576 | } | |
577 | if (ch == '\r') continue; | |
578 | ||
579 | if (fputc(ch, fout) == EOF) return END_WERROR; | |
580 | if (ch == '\n') body_linecount++; | |
581 | if (++message_size > thismessage_size_limit) return END_SIZE; | |
582 | } | |
583 | ||
584 | if (last_ch != '\n') | |
585 | { | |
586 | if (fputc('\n', fout) == EOF) return END_WERROR; | |
587 | message_size++; | |
588 | body_linecount++; | |
589 | } | |
590 | ||
591 | return END_EOF; | |
592 | } | |
593 | ||
594 | /* Handle the case when a dot on a line on its own, or EOF, terminates. */ | |
595 | ||
596 | ch_state = 1; | |
597 | ||
598 | while ((ch = (receive_getc)()) != EOF) | |
599 | { | |
600 | if (ch == 0) body_zerocount++; | |
601 | switch (ch_state) | |
602 | { | |
603 | case 0: /* Normal state (previous char written) */ | |
604 | if (ch == '\n') | |
605 | { body_linecount++; ch_state = 1; } | |
606 | else if (ch == '\r') | |
607 | { ch_state = 2; continue; } | |
608 | break; | |
609 | ||
610 | case 1: /* After written "\n" */ | |
611 | if (ch == '.') { ch_state = 3; continue; } | |
612 | if (ch != '\n') ch_state = 0; | |
613 | break; | |
614 | ||
615 | case 2: | |
616 | body_linecount++; /* After unwritten "\r" */ | |
617 | if (ch == '\n') | |
618 | { ch_state = 1; } | |
619 | else | |
620 | { | |
621 | if (message_size++, fputc('\n', fout) == EOF) return END_WERROR; | |
622 | if (ch == '\r') continue; | |
623 | ch_state = 0; | |
624 | } | |
625 | break; | |
626 | ||
627 | case 3: /* After "\n." (\n written, dot not) */ | |
628 | if (ch == '\n') return END_DOT; | |
629 | if (ch == '\r') { ch_state = 4; continue; } | |
630 | message_size++; | |
631 | if (fputc('.', fout) == EOF) return END_WERROR; | |
632 | ch_state = 0; | |
633 | break; | |
634 | ||
635 | case 4: /* After "\n.\r" (\n written, rest not) */ | |
636 | if (ch == '\n') return END_DOT; | |
637 | message_size += 2; | |
638 | body_linecount++; | |
639 | if (fputs(".\n", fout) == EOF) return END_WERROR; | |
640 | if (ch == '\r') { ch_state = 2; continue; } | |
641 | ch_state = 0; | |
642 | break; | |
643 | } | |
644 | ||
645 | if (fputc(ch, fout) == EOF) return END_WERROR; | |
646 | if (++message_size > thismessage_size_limit) return END_SIZE; | |
647 | } | |
648 | ||
649 | /* Get here if EOF read. Unless we have just written "\n", we need to ensure | |
650 | the message ends with a newline, and we must also write any characters that | |
651 | were saved up while testing for an ending dot. */ | |
652 | ||
653 | if (ch_state != 1) | |
654 | { | |
655 | static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" }; | |
656 | if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR; | |
657 | message_size += Ustrlen(ends[ch_state]); | |
658 | body_linecount++; | |
659 | } | |
660 | ||
661 | return END_EOF; | |
662 | } | |
663 | ||
664 | ||
665 | ||
666 | ||
667 | /************************************************* | |
668 | * Read data portion of an SMTP message * | |
669 | *************************************************/ | |
670 | ||
671 | /* This function is called to read the remainder of an SMTP message (after the | |
672 | headers), or to skip over it when an error has occurred. In this case, the | |
673 | output file is passed as NULL. | |
674 | ||
675 | If any line begins with a dot, that character is skipped. The input should only | |
676 | be successfully terminated by CR LF . CR LF unless it is local (non-network) | |
677 | SMTP, in which case the CRs are optional, but... | |
678 | ||
679 | FUDGE: It seems that sites on the net send out messages with just LF | |
680 | terminators, despite the warnings in the RFCs, and other MTAs handle this. So | |
681 | we make the CRs optional in all cases. | |
682 | ||
683 | July 2003: Bare CRs cause trouble. We now treat them as line terminators as | |
684 | well, so that there are no CRs in spooled messages. However, the message | |
685 | terminating dot is not recognized between two bare CRs. | |
686 | ||
687 | Arguments: | |
688 | fout a FILE to which to write the message; NULL if skipping | |
689 | ||
690 | Returns: One of the END_xxx values indicating why it stopped reading | |
691 | */ | |
692 | ||
693 | static int | |
694 | read_message_data_smtp(FILE *fout) | |
695 | { | |
696 | int ch_state = 0; | |
697 | register int ch; | |
698 | ||
699 | while ((ch = (receive_getc)()) != EOF) | |
700 | { | |
701 | if (ch == 0) body_zerocount++; | |
702 | switch (ch_state) | |
703 | { | |
704 | case 0: /* After LF or CRLF */ | |
705 | if (ch == '.') | |
706 | { | |
707 | ch_state = 3; | |
708 | continue; /* Don't ever write . after LF */ | |
709 | } | |
710 | ch_state = 1; | |
711 | ||
712 | /* Else fall through to handle as normal uschar. */ | |
713 | ||
714 | case 1: /* Normal state */ | |
715 | if (ch == '\n') | |
716 | { | |
717 | ch_state = 0; | |
718 | body_linecount++; | |
719 | } | |
720 | else if (ch == '\r') | |
721 | { | |
722 | ch_state = 2; | |
723 | continue; | |
724 | } | |
725 | break; | |
726 | ||
727 | case 2: /* After (unwritten) CR */ | |
728 | body_linecount++; | |
729 | if (ch == '\n') | |
730 | { | |
731 | ch_state = 0; | |
732 | } | |
733 | else | |
734 | { | |
735 | message_size++; | |
736 | if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR; | |
737 | if (ch != '\r') ch_state = 1; else continue; | |
738 | } | |
739 | break; | |
740 | ||
741 | case 3: /* After [CR] LF . */ | |
742 | if (ch == '\n') | |
743 | return END_DOT; | |
744 | if (ch == '\r') | |
745 | { | |
746 | ch_state = 4; | |
747 | continue; | |
748 | } | |
749 | ch_state = 1; /* The dot itself is removed */ | |
750 | break; | |
751 | ||
752 | case 4: /* After [CR] LF . CR */ | |
753 | if (ch == '\n') return END_DOT; | |
754 | message_size++; | |
755 | body_linecount++; | |
756 | if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR; | |
757 | if (ch == '\r') | |
758 | { | |
759 | ch_state = 2; | |
760 | continue; | |
761 | } | |
762 | ch_state = 1; | |
763 | break; | |
764 | } | |
765 | ||
766 | /* Add the character to the spool file, unless skipping; then loop for the | |
767 | next. */ | |
768 | ||
769 | message_size++; | |
770 | if (fout != NULL) | |
771 | { | |
772 | if (fputc(ch, fout) == EOF) return END_WERROR; | |
773 | if (message_size > thismessage_size_limit) return END_SIZE; | |
774 | } | |
775 | } | |
776 | ||
777 | /* Fall through here if EOF encountered. This indicates some kind of error, | |
778 | since a correct message is terminated by [CR] LF . [CR] LF. */ | |
779 | ||
780 | return END_EOF; | |
781 | } | |
782 | ||
783 | ||
784 | ||
785 | ||
786 | /************************************************* | |
787 | * Swallow SMTP message * | |
788 | *************************************************/ | |
789 | ||
790 | /* This function is called when there has been some kind of error while reading | |
791 | an SMTP message, and the remaining data may need to be swallowed. It is global | |
792 | because it is called from smtp_closedown() to shut down an incoming call | |
793 | tidily. | |
794 | ||
795 | Argument: a FILE from which to read the message | |
796 | Returns: nothing | |
797 | */ | |
798 | ||
799 | void | |
800 | receive_swallow_smtp(void) | |
801 | { | |
802 | if (message_ended >= END_NOTENDED) | |
803 | message_ended = read_message_data_smtp(NULL); | |
804 | } | |
805 | ||
806 | ||
807 | ||
808 | /************************************************* | |
809 | * Handle lost SMTP connection * | |
810 | *************************************************/ | |
811 | ||
812 | /* This function logs connection loss incidents and generates an appropriate | |
813 | SMTP response. | |
814 | ||
815 | Argument: additional data for the message | |
816 | Returns: the SMTP response | |
817 | */ | |
818 | ||
819 | static uschar * | |
820 | handle_lost_connection(uschar *s) | |
821 | { | |
822 | log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN, | |
823 | "%s lost while reading message data%s", smtp_get_connection_info(), s); | |
824 | return US"421 Lost incoming connection"; | |
825 | } | |
826 | ||
827 | ||
828 | ||
829 | ||
830 | /************************************************* | |
831 | * Handle a non-smtp reception error * | |
832 | *************************************************/ | |
833 | ||
834 | /* This function is called for various errors during the reception of non-SMTP | |
835 | messages. It either sends a message to the sender of the problem message, or it | |
836 | writes to the standard error stream. | |
837 | ||
838 | Arguments: | |
839 | errcode code for moan_to_sender(), identifying the error | |
840 | text1 first message text, passed to moan_to_sender() | |
841 | text2 second message text, used only for stderrr | |
842 | error_rc code to pass to exim_exit if no problem | |
843 | f FILE containing body of message (may be stdin) | |
844 | hptr pointer to instore headers or NULL | |
845 | ||
846 | Returns: calls exim_exit(), which does not return | |
847 | */ | |
848 | ||
849 | static void | |
850 | give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc, | |
851 | FILE *f, header_line *hptr) | |
852 | { | |
853 | if (error_handling == ERRORS_SENDER) | |
854 | { | |
855 | error_block eblock; | |
856 | eblock.next = NULL; | |
857 | eblock.text1 = text1; | |
858 | if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE)) | |
859 | error_rc = EXIT_FAILURE; | |
860 | } | |
861 | else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */ | |
862 | fclose(f); | |
863 | exim_exit(error_rc); | |
864 | } | |
865 | ||
866 | ||
867 | ||
868 | /************************************************* | |
869 | * Add header lines set up by ACL * | |
870 | *************************************************/ | |
871 | ||
872 | /* This function is called to add the header lines that were set up by "warn" | |
873 | statements in an ACL onto the list of headers in memory. It is done in two | |
874 | stages like this, because when the ACL for RCPT is running, the other headers | |
875 | have not yet been received. This function is called twice; once just before | |
876 | running the DATA ACL, and once after. This is so that header lines added by | |
877 | MAIL or RCPT are visible to the DATA ACL. | |
878 | ||
879 | Originally these header lines were added at the end. Now there is support for | |
880 | three different places: top, bottom, and after the Received: header(s). There | |
881 | will always be at least one Received: header, even if it is marked deleted, and | |
882 | even if something else has been put in front of it. | |
883 | ||
884 | Arguments: | |
885 | acl_name text to identify which ACL | |
886 | ||
887 | Returns: nothing | |
888 | */ | |
889 | ||
890 | static void | |
891 | add_acl_headers(uschar *acl_name) | |
892 | { | |
893 | header_line *h, *next; | |
894 | header_line *last_received = NULL; | |
895 | ||
896 | if (acl_warn_headers == NULL) return; | |
897 | DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name); | |
898 | ||
899 | for (h = acl_warn_headers; h != NULL; h = next) | |
900 | { | |
901 | next = h->next; | |
902 | ||
903 | switch(h->type) | |
904 | { | |
905 | case htype_add_top: | |
906 | h->next = header_list; | |
907 | header_list = h; | |
908 | DEBUG(D_receive|D_acl) debug_printf(" (at top)"); | |
909 | break; | |
910 | ||
911 | case htype_add_rec: | |
912 | if (last_received == NULL) | |
913 | { | |
914 | last_received = header_list; | |
915 | while (!header_testname(last_received, US"Received", 8, FALSE)) | |
916 | last_received = last_received->next; | |
917 | while (last_received->next != NULL && | |
918 | header_testname(last_received->next, US"Received", 8, FALSE)) | |
919 | last_received = last_received->next; | |
920 | } | |
921 | h->next = last_received->next; | |
922 | last_received->next = h; | |
923 | DEBUG(D_receive|D_acl) debug_printf(" (after Received:)"); | |
924 | break; | |
925 | ||
8523533c TK |
926 | case htype_add_rfc: |
927 | /* add header before any header which is NOT Received: or Resent- */ | |
928 | last_received = header_list; | |
929 | while ( (last_received->next != NULL) && | |
930 | ( (header_testname(last_received->next, US"Received", 8, FALSE)) || | |
931 | (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) ) | |
932 | last_received = last_received->next; | |
933 | /* last_received now points to the last Received: or Resent-* header | |
934 | in an uninterrupted chain of those header types (seen from the beginning | |
935 | of all headers. Our current header must follow it. */ | |
936 | h->next = last_received->next; | |
937 | last_received->next = h; | |
938 | DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)"); | |
939 | break; | |
940 | ||
059ec3d9 PH |
941 | default: |
942 | h->next = NULL; | |
943 | header_last->next = h; | |
944 | break; | |
945 | } | |
946 | ||
947 | if (h->next == NULL) header_last = h; | |
948 | ||
949 | /* Check for one of the known header types (From:, To:, etc.) though in | |
950 | practice most added headers are going to be "other". Lower case | |
951 | identification letters are never stored with the header; they are used | |
952 | for existence tests when messages are received. So discard any lower case | |
953 | flag values. */ | |
954 | ||
955 | h->type = header_checkname(h, FALSE); | |
956 | if (h->type >= 'a') h->type = htype_other; | |
957 | ||
958 | DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text); | |
959 | } | |
960 | ||
961 | acl_warn_headers = NULL; | |
962 | DEBUG(D_receive|D_acl) debug_printf(">>\n"); | |
963 | } | |
964 | ||
965 | ||
966 | ||
967 | /************************************************* | |
968 | * Add host information for log line * | |
969 | *************************************************/ | |
970 | ||
971 | /* Called for acceptance and rejecting log lines. This adds information about | |
972 | the calling host to a string that is being built dynamically. | |
973 | ||
974 | Arguments: | |
975 | s the dynamic string | |
976 | sizeptr points to the size variable | |
977 | ptrptr points to the pointer variable | |
978 | ||
979 | Returns: the extended string | |
980 | */ | |
981 | ||
982 | static uschar * | |
983 | add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr) | |
984 | { | |
985 | if (sender_fullhost != NULL) | |
986 | { | |
987 | s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost); | |
988 | if ((log_extra_selector & LX_incoming_interface) != 0 && | |
989 | interface_address != NULL) | |
990 | { | |
991 | uschar *ss = string_sprintf(" I=[%s]:%d", interface_address, | |
992 | interface_port); | |
993 | s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss)); | |
994 | } | |
995 | } | |
996 | if (sender_ident != NULL) | |
997 | s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident); | |
998 | if (received_protocol != NULL) | |
999 | s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol); | |
1000 | return s; | |
1001 | } | |
1002 | ||
1003 | ||
1004 | ||
1005 | ||
1006 | /************************************************* | |
1007 | * Receive message * | |
1008 | *************************************************/ | |
1009 | ||
1010 | /* Receive a message on the given input, and put it into a pair of spool files. | |
1011 | Either a non-null list of recipients, or the extract flag will be true, or | |
1012 | both. The flag sender_local is true for locally generated messages. The flag | |
1013 | submission_mode is true if an ACL has obeyed "control = submission". The flag | |
1014 | smtp_input is true if the message is to be handled using SMTP conventions about | |
1015 | termination and lines starting with dots. For non-SMTP messages, dot_ends is | |
1016 | true for dot-terminated messages. | |
1017 | ||
1018 | If a message was successfully read, message_id[0] will be non-zero. | |
1019 | ||
1020 | The general actions of this function are: | |
1021 | ||
1022 | . Read the headers of the message (if any) into a chain of store | |
1023 | blocks. | |
1024 | ||
1025 | . If there is a "sender:" header and the message is locally originated, | |
69358f02 PH |
1026 | throw it away, unless the caller is trusted, or unless |
1027 | active_local_sender_retain is set - which can only happen if | |
1028 | active_local_from_check is false. | |
059ec3d9 PH |
1029 | |
1030 | . If recipients are to be extracted from the message, build the | |
1031 | recipients list from the headers, removing any that were on the | |
1032 | original recipients list (unless extract_addresses_remove_arguments is | |
1033 | false), and at the same time, remove any bcc header that may be present. | |
1034 | ||
1035 | . Get the spool file for the data, sort out its unique name, open | |
1036 | and lock it (but don't give it the name yet). | |
1037 | ||
1038 | . Generate a "Message-Id" header if the message doesn't have one, for | |
1039 | locally-originated messages. | |
1040 | ||
1041 | . Generate a "Received" header. | |
1042 | ||
1043 | . Ensure the recipients list is fully qualified and rewritten if necessary. | |
1044 | ||
1045 | . If there are any rewriting rules, apply them to the sender address | |
1046 | and also to the headers. | |
1047 | ||
1048 | . If there is no from: header, generate one, for locally-generated messages | |
1049 | and messages in "submission mode" only. | |
1050 | ||
1051 | . If the sender is local, check that from: is correct, and if not, generate | |
1052 | a Sender: header, unless message comes from a trusted caller, or this | |
69358f02 | 1053 | feature is disabled by active_local_from_check being false. |
059ec3d9 PH |
1054 | |
1055 | . If there is no "date" header, generate one, for locally-originated | |
1056 | or submission mode messages only. | |
1057 | ||
1058 | . Copy the rest of the input, or up to a terminating "." if in SMTP or | |
1059 | dot_ends mode, to the data file. Leave it open, to hold the lock. | |
1060 | ||
1061 | . Write the envelope and the headers to a new file. | |
1062 | ||
1063 | . Set the name for the header file; close it. | |
1064 | ||
1065 | . Set the name for the data file; close it. | |
1066 | ||
1067 | Because this function can potentially be called many times in a single | |
1068 | SMTP connection, all store should be got by store_get(), so that it will be | |
1069 | automatically retrieved after the message is accepted. | |
1070 | ||
1071 | FUDGE: It seems that sites on the net send out messages with just LF | |
1072 | terminators, despite the warnings in the RFCs, and other MTAs handle this. So | |
1073 | we make the CRs optional in all cases. | |
1074 | ||
1075 | July 2003: Bare CRs in messages, especially in header lines, cause trouble. A | |
1076 | new regime is now in place in which bare CRs in header lines are turned into LF | |
1077 | followed by a space, so as not to terminate the header line. | |
1078 | ||
1079 | February 2004: A bare LF in a header line in a message whose first line was | |
1080 | terminated by CRLF is treated in the same way as a bare CR. | |
1081 | ||
1082 | Arguments: | |
1083 | extract_recip TRUE if recipients are to be extracted from the message's | |
1084 | headers | |
1085 | ||
1086 | Returns: TRUE there are more messages to be read (SMTP input) | |
1087 | FALSE there are no more messages to be read (non-SMTP input | |
1088 | or SMTP connection collapsed, or other failure) | |
1089 | ||
1090 | When reading a message for filter testing, the returned value indicates | |
1091 | whether the headers (which is all that is read) were terminated by '.' or | |
1092 | not. */ | |
1093 | ||
1094 | BOOL | |
1095 | receive_msg(BOOL extract_recip) | |
1096 | { | |
1097 | int i, rc; | |
1098 | int msg_size = 0; | |
1099 | int process_info_len = Ustrlen(process_info); | |
1100 | int error_rc = (error_handling == ERRORS_SENDER)? | |
1101 | errors_sender_rc : EXIT_FAILURE; | |
1102 | int header_size = 256; | |
1103 | int start, end, domain, size, sptr; | |
1104 | int id_resolution; | |
1105 | int had_zero = 0; | |
1106 | ||
1107 | register int ptr = 0; | |
1108 | ||
1109 | BOOL contains_resent_headers = FALSE; | |
1110 | BOOL extracted_ignored = FALSE; | |
1111 | BOOL first_line_ended_crlf = TRUE_UNSET; | |
1112 | BOOL smtp_yield = TRUE; | |
1113 | BOOL yield = FALSE; | |
1114 | ||
1115 | BOOL resents_exist = FALSE; | |
1116 | uschar *resent_prefix = US""; | |
1117 | uschar *blackholed_by = NULL; | |
1118 | ||
1119 | flock_t lock_data; | |
1120 | error_block *bad_addresses = NULL; | |
1121 | ||
1122 | uschar *frozen_by = NULL; | |
1123 | uschar *queued_by = NULL; | |
1124 | ||
1125 | uschar *errmsg, *s; | |
1126 | struct stat statbuf; | |
1127 | ||
1128 | /* Final message to give to SMTP caller */ | |
1129 | ||
1130 | uschar *smtp_reply = NULL; | |
1131 | ||
1132 | /* Working header pointers */ | |
1133 | ||
1134 | header_line *h, *next; | |
1135 | ||
1136 | /* Flags for noting the existence of certain headers */ | |
1137 | ||
1138 | /**** No longer check for these (Nov 2003) | |
1139 | BOOL to_or_cc_header_exists = FALSE; | |
1140 | BOOL bcc_header_exists = FALSE; | |
1141 | ****/ | |
1142 | ||
1143 | BOOL date_header_exists = FALSE; | |
1144 | ||
1145 | /* Pointers to receive the addresses of headers whose contents we need. */ | |
1146 | ||
1147 | header_line *from_header = NULL; | |
1148 | header_line *subject_header = NULL; | |
1149 | header_line *msgid_header = NULL; | |
1150 | header_line *received_header; | |
1151 | ||
1152 | /* Variables for use when building the Received: header. */ | |
1153 | ||
1154 | uschar *received; | |
1155 | uschar *timestamp; | |
1156 | int tslen; | |
1157 | ||
1158 | /* Release any open files that might have been cached while preparing to | |
1159 | accept the message - e.g. by verifying addresses - because reading a message | |
1160 | might take a fair bit of real time. */ | |
1161 | ||
1162 | search_tidyup(); | |
1163 | ||
1164 | /* Initialize the chain of headers by setting up a place-holder for Received: | |
1165 | header. Temporarily mark it as "old", i.e. not to be used. We keep header_last | |
1166 | pointing to the end of the chain to make adding headers simple. */ | |
1167 | ||
1168 | received_header = header_list = header_last = store_get(sizeof(header_line)); | |
1169 | header_list->next = NULL; | |
1170 | header_list->type = htype_old; | |
1171 | header_list->text = NULL; | |
1172 | header_list->slen = 0; | |
1173 | ||
1174 | /* Control block for the next header to be read. */ | |
1175 | ||
1176 | next = store_get(sizeof(header_line)); | |
1177 | next->text = store_get(header_size); | |
1178 | ||
1179 | /* Initialize message id to be null (indicating no message read), and the | |
1180 | header names list to be the normal list. Indicate there is no data file open | |
1181 | yet, initialize the size and warning count, and deal with no size limit. */ | |
1182 | ||
1183 | message_id[0] = 0; | |
1184 | data_file = NULL; | |
1185 | data_fd = -1; | |
1186 | spool_name[0] = 0; | |
1187 | message_size = 0; | |
1188 | warning_count = 0; | |
1189 | received_count = 1; /* For the one we will add */ | |
1190 | ||
1191 | if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX; | |
1192 | ||
1193 | /* While reading the message, body_linecount and body_zerocount is computed. | |
1194 | The full message_ linecount is set up only when the headers are read back in | |
1195 | from the spool for delivery. */ | |
1196 | ||
1197 | body_linecount = body_zerocount = 0; | |
1198 | ||
1199 | /* Remember the time of reception. Exim uses time+pid for uniqueness of message | |
1200 | ids, and fractions of a second are required. See the comments that precede the | |
1201 | message id creation below. */ | |
1202 | ||
1203 | (void)gettimeofday(&message_id_tv, NULL); | |
1204 | ||
1205 | /* For other uses of the received time we can operate with granularity of one | |
1206 | second, and for that we use the global variable received_time. This is for | |
1207 | things like ultimate message timeouts. */ | |
1208 | ||
1209 | received_time = message_id_tv.tv_sec; | |
1210 | ||
1211 | /* If SMTP input, set the special handler for timeouts. The alarm() calls | |
1212 | happen in the smtp_getc() function when it refills its buffer. */ | |
1213 | ||
1214 | if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler); | |
1215 | ||
1216 | /* If not SMTP input, timeout happens only if configured, and we just set a | |
1217 | single timeout for the whole message. */ | |
1218 | ||
1219 | else if (receive_timeout > 0) | |
1220 | { | |
1221 | os_non_restarting_signal(SIGALRM, data_timeout_handler); | |
1222 | alarm(receive_timeout); | |
1223 | } | |
1224 | ||
1225 | /* SIGTERM and SIGINT are caught always. */ | |
1226 | ||
1227 | signal(SIGTERM, data_sigterm_sigint_handler); | |
1228 | signal(SIGINT, data_sigterm_sigint_handler); | |
1229 | ||
1230 | /* Header lines in messages are not supposed to be very long, though when | |
1231 | unfolded, to: and cc: headers can take up a lot of store. We must also cope | |
1232 | with the possibility of junk being thrown at us. Start by getting 256 bytes for | |
1233 | storing the header, and extend this as necessary using string_cat(). | |
1234 | ||
1235 | To cope with total lunacies, impose an upper limit on the length of the header | |
1236 | section of the message, as otherwise the store will fill up. We must also cope | |
1237 | with the possibility of binary zeros in the data. Hence we cannot use fgets(). | |
1238 | Folded header lines are joined into one string, leaving the '\n' characters | |
1239 | inside them, so that writing them out reproduces the input. | |
1240 | ||
1241 | Loop for each character of each header; the next structure for chaining the | |
1242 | header is set up already, with ptr the offset of the next character in | |
1243 | next->text. */ | |
1244 | ||
1245 | for (;;) | |
1246 | { | |
1247 | int ch = (receive_getc)(); | |
1248 | ||
1249 | /* If we hit EOF on a SMTP connection, it's an error, since incoming | |
1250 | SMTP must have a correct "." terminator. */ | |
1251 | ||
1252 | if (ch == EOF && smtp_input /* && !smtp_batched_input */) | |
1253 | { | |
1254 | smtp_reply = handle_lost_connection(US" (header)"); | |
1255 | smtp_yield = FALSE; | |
1256 | goto TIDYUP; /* Skip to end of function */ | |
1257 | } | |
1258 | ||
1259 | /* See if we are at the current header's size limit - there must be at least | |
1260 | four bytes left. This allows for the new character plus a zero, plus two for | |
1261 | extra insertions when we are playing games with dots and carriage returns. If | |
1262 | we are at the limit, extend the text buffer. This could have been done | |
1263 | automatically using string_cat() but because this is a tightish loop storing | |
1264 | only one character at a time, we choose to do it inline. Normally | |
1265 | store_extend() will be able to extend the block; only at the end of a big | |
1266 | store block will a copy be needed. To handle the case of very long headers | |
1267 | (and sometimes lunatic messages can have ones that are 100s of K long) we | |
1268 | call store_release() for strings that have been copied - if the string is at | |
1269 | the start of a block (and therefore the only thing in it, because we aren't | |
1270 | doing any other gets), the block gets freed. We can only do this because we | |
1271 | know there are no other calls to store_get() going on. */ | |
1272 | ||
1273 | if (ptr >= header_size - 4) | |
1274 | { | |
1275 | int oldsize = header_size; | |
1276 | /* header_size += 256; */ | |
1277 | header_size *= 2; | |
1278 | if (!store_extend(next->text, oldsize, header_size)) | |
1279 | { | |
1280 | uschar *newtext = store_get(header_size); | |
1281 | memcpy(newtext, next->text, ptr); | |
1282 | store_release(next->text); | |
1283 | next->text = newtext; | |
1284 | } | |
1285 | } | |
1286 | ||
1287 | /* Cope with receiving a binary zero. There is dispute about whether | |
1288 | these should be allowed in RFC 822 messages. The middle view is that they | |
1289 | should not be allowed in headers, at least. Exim takes this attitude at | |
1290 | the moment. We can't just stomp on them here, because we don't know that | |
1291 | this line is a header yet. Set a flag to cause scanning later. */ | |
1292 | ||
1293 | if (ch == 0) had_zero++; | |
1294 | ||
1295 | /* Test for termination. Lines in remote SMTP are terminated by CRLF, while | |
1296 | those from data files use just LF. Treat LF in local SMTP input as a | |
1297 | terminator too. Treat EOF as a line terminator always. */ | |
1298 | ||
1299 | if (ch == EOF) goto EOL; | |
1300 | ||
1301 | /* FUDGE: There are sites out there that don't send CRs before their LFs, and | |
1302 | other MTAs accept this. We are therefore forced into this "liberalisation" | |
1303 | too, so we accept LF as a line terminator whatever the source of the message. | |
1304 | However, if the first line of the message ended with a CRLF, we treat a bare | |
1305 | LF specially by inserting a white space after it to ensure that the header | |
1306 | line is not terminated. */ | |
1307 | ||
1308 | if (ch == '\n') | |
1309 | { | |
1310 | if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE; | |
1311 | else if (first_line_ended_crlf) receive_ungetc(' '); | |
1312 | goto EOL; | |
1313 | } | |
1314 | ||
1315 | /* This is not the end of the line. If this is SMTP input and this is | |
1316 | the first character in the line and it is a "." character, ignore it. | |
1317 | This implements the dot-doubling rule, though header lines starting with | |
1318 | dots aren't exactly common. They are legal in RFC 822, though. If the | |
1319 | following is CRLF or LF, this is the line that that terminates the | |
1320 | entire message. We set message_ended to indicate this has happened (to | |
1321 | prevent further reading), and break out of the loop, having freed the | |
1322 | empty header, and set next = NULL to indicate no data line. */ | |
1323 | ||
1324 | if (ptr == 0 && ch == '.' && (smtp_input || dot_ends)) | |
1325 | { | |
1326 | ch = (receive_getc)(); | |
1327 | if (ch == '\r') | |
1328 | { | |
1329 | ch = (receive_getc)(); | |
1330 | if (ch != '\n') | |
1331 | { | |
1332 | receive_ungetc(ch); | |
1333 | ch = '\r'; /* Revert to CR */ | |
1334 | } | |
1335 | } | |
1336 | if (ch == '\n') | |
1337 | { | |
1338 | message_ended = END_DOT; | |
1339 | store_reset(next); | |
1340 | next = NULL; | |
1341 | break; /* End character-reading loop */ | |
1342 | } | |
1343 | ||
1344 | /* For non-SMTP input, the dot at the start of the line was really a data | |
1345 | character. What is now in ch is the following character. We guaranteed | |
1346 | enough space for this above. */ | |
1347 | ||
1348 | if (!smtp_input) | |
1349 | { | |
1350 | next->text[ptr++] = '.'; | |
1351 | message_size++; | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | /* If CR is immediately followed by LF, end the line, ignoring the CR, and | |
1356 | remember this case if this is the first line ending. */ | |
1357 | ||
1358 | if (ch == '\r') | |
1359 | { | |
1360 | ch = (receive_getc)(); | |
1361 | if (ch == '\n') | |
1362 | { | |
1363 | if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE; | |
1364 | goto EOL; | |
1365 | } | |
1366 | ||
1367 | /* Otherwise, put back the character after CR, and turn the bare CR | |
1368 | into LF SP. */ | |
1369 | ||
1370 | ch = (receive_ungetc)(ch); | |
1371 | next->text[ptr++] = '\n'; | |
1372 | message_size++; | |
1373 | ch = ' '; | |
1374 | } | |
1375 | ||
1376 | /* We have a data character for the header line. */ | |
1377 | ||
1378 | next->text[ptr++] = ch; /* Add to buffer */ | |
1379 | message_size++; /* Total message size so far */ | |
1380 | ||
1381 | /* Handle failure due to a humungously long header section. The >= allows | |
1382 | for the terminating \n. Add what we have so far onto the headers list so | |
1383 | that it gets reflected in any error message, and back up the just-read | |
1384 | character. */ | |
1385 | ||
1386 | if (message_size >= header_maxsize) | |
1387 | { | |
1388 | next->text[ptr] = 0; | |
1389 | next->slen = ptr; | |
1390 | next->type = htype_other; | |
1391 | next->next = NULL; | |
1392 | header_last->next = next; | |
1393 | header_last = next; | |
1394 | ||
1395 | log_write(0, LOG_MAIN, "ridiculously long message header received from " | |
1396 | "%s (more than %d characters): message abandoned", | |
1397 | sender_host_unknown? sender_ident : sender_fullhost, header_maxsize); | |
1398 | ||
1399 | if (smtp_input) | |
1400 | { | |
1401 | smtp_reply = US"552 Message header is ridiculously long"; | |
1402 | receive_swallow_smtp(); | |
1403 | goto TIDYUP; /* Skip to end of function */ | |
1404 | } | |
1405 | ||
1406 | else | |
1407 | { | |
1408 | give_local_error(ERRMESS_VLONGHEADER, | |
1409 | string_sprintf("message header longer than %d characters received: " | |
1410 | "message not accepted", header_maxsize), US"", error_rc, stdin, | |
1411 | header_list->next); | |
1412 | /* Does not return */ | |
1413 | } | |
1414 | } | |
1415 | ||
1416 | continue; /* With next input character */ | |
1417 | ||
1418 | /* End of header line reached */ | |
1419 | ||
1420 | EOL: | |
1421 | receive_linecount++; /* For BSMTP errors */ | |
1422 | ||
1423 | /* Now put in the terminating newline. There is always space for | |
1424 | at least two more characters. */ | |
1425 | ||
1426 | next->text[ptr++] = '\n'; | |
1427 | message_size++; | |
1428 | ||
1429 | /* A blank line signals the end of the headers; release the unwanted | |
1430 | space and set next to NULL to indicate this. */ | |
1431 | ||
1432 | if (ptr == 1) | |
1433 | { | |
1434 | store_reset(next); | |
1435 | next = NULL; | |
1436 | break; | |
1437 | } | |
1438 | ||
1439 | /* There is data in the line; see if the next input character is a | |
1440 | whitespace character. If it is, we have a continuation of this header line. | |
1441 | There is always space for at least one character at this point. */ | |
1442 | ||
1443 | if (ch != EOF) | |
1444 | { | |
1445 | int nextch = (receive_getc)(); | |
1446 | if (nextch == ' ' || nextch == '\t') | |
1447 | { | |
1448 | next->text[ptr++] = nextch; | |
1449 | message_size++; | |
1450 | continue; /* Iterate the loop */ | |
1451 | } | |
1452 | else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */ | |
1453 | else ch = EOF; /* Cause main loop to exit at end */ | |
1454 | } | |
1455 | ||
1456 | /* We have got to the real line end. Terminate the string and release store | |
1457 | beyond it. If it turns out to be a real header, internal binary zeros will | |
1458 | be squashed later. */ | |
1459 | ||
1460 | next->text[ptr] = 0; | |
1461 | next->slen = ptr; | |
1462 | store_reset(next->text + ptr + 1); | |
1463 | ||
1464 | /* Check the running total size against the overall message size limit. We | |
1465 | don't expect to fail here, but if the overall limit is set less than MESSAGE_ | |
1466 | MAXSIZE and a big header is sent, we want to catch it. Just stop reading | |
1467 | headers - the code to read the body will then also hit the buffer. */ | |
1468 | ||
1469 | if (message_size > thismessage_size_limit) break; | |
1470 | ||
1471 | /* A line that is not syntactically correct for a header also marks | |
1472 | the end of the headers. In this case, we leave next containing the | |
1473 | first data line. This might actually be several lines because of the | |
1474 | continuation logic applied above, but that doesn't matter. | |
1475 | ||
1476 | It turns out that smail, and presumably sendmail, accept leading lines | |
1477 | of the form | |
1478 | ||
1479 | From ph10 Fri Jan 5 12:35 GMT 1996 | |
1480 | ||
1481 | in messages. The "mail" command on Solaris 2 sends such lines. I cannot | |
1482 | find any documentation of this, but for compatibility it had better be | |
1483 | accepted. Exim restricts it to the case of non-smtp messages, and | |
1484 | treats it as an alternative to the -f command line option. Thus it is | |
1485 | ignored except for trusted users or filter testing. Otherwise it is taken | |
1486 | as the sender address, unless -f was used (sendmail compatibility). | |
1487 | ||
1488 | It further turns out that some UUCPs generate the From_line in a different | |
1489 | format, e.g. | |
1490 | ||
1491 | From ph10 Fri, 7 Jan 97 14:00:00 GMT | |
1492 | ||
1493 | The regex for matching these things is now capable of recognizing both | |
1494 | formats (including 2- and 4-digit years in the latter). In fact, the regex | |
1495 | is now configurable, as is the expansion string to fish out the sender. | |
1496 | ||
1497 | Even further on it has been discovered that some broken clients send | |
1498 | these lines in SMTP messages. There is now an option to ignore them from | |
1499 | specified hosts or networks. Sigh. */ | |
1500 | ||
1501 | if (header_last == header_list && | |
1502 | (!smtp_input | |
1503 | || | |
1504 | (sender_host_address != NULL && | |
1505 | verify_check_host(&ignore_fromline_hosts) == OK) | |
1506 | || | |
1507 | (sender_host_address == NULL && ignore_fromline_local) | |
1508 | ) && | |
1509 | regex_match_and_setup(regex_From, next->text, 0, -1)) | |
1510 | { | |
1511 | if (!sender_address_forced) | |
1512 | { | |
1513 | uschar *uucp_sender = expand_string(uucp_from_sender); | |
1514 | if (uucp_sender == NULL) | |
1515 | { | |
1516 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1517 | "expansion of \"%s\" failed after matching " | |
1518 | "\"From \" line: %s", uucp_from_sender, expand_string_message); | |
1519 | } | |
1520 | else | |
1521 | { | |
1522 | int start, end, domain; | |
1523 | uschar *errmess; | |
1524 | uschar *newsender = parse_extract_address(uucp_sender, &errmess, | |
1525 | &start, &end, &domain, TRUE); | |
1526 | if (newsender != NULL) | |
1527 | { | |
1528 | if (domain == 0 && newsender[0] != 0) | |
1529 | newsender = rewrite_address_qualify(newsender, FALSE); | |
1530 | ||
f05da2e8 | 1531 | if (filter_test != FTEST_NONE || receive_check_set_sender(newsender)) |
059ec3d9 PH |
1532 | { |
1533 | sender_address = newsender; | |
1534 | ||
f05da2e8 | 1535 | if (trusted_caller || filter_test != FTEST_NONE) |
059ec3d9 PH |
1536 | { |
1537 | authenticated_sender = NULL; | |
1538 | originator_name = US""; | |
1539 | sender_local = FALSE; | |
1540 | } | |
1541 | ||
f05da2e8 | 1542 | if (filter_test != FTEST_NONE) |
059ec3d9 PH |
1543 | printf("Sender taken from \"From \" line\n"); |
1544 | } | |
1545 | } | |
1546 | } | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | /* Not a leading "From " line. Check to see if it is a valid header line. | |
1551 | Header names may contain any non-control characters except space and colon, | |
1552 | amazingly. */ | |
1553 | ||
1554 | else | |
1555 | { | |
1556 | uschar *p = next->text; | |
1557 | ||
1558 | /* If not a valid header line, break from the header reading loop, leaving | |
1559 | next != NULL, indicating that it holds the first line of the body. */ | |
1560 | ||
1561 | if (isspace(*p)) break; | |
1562 | while (mac_isgraph(*p) && *p != ':') p++; | |
1563 | while (isspace(*p)) p++; | |
1564 | if (*p != ':') | |
1565 | { | |
1566 | body_zerocount = had_zero; | |
1567 | break; | |
1568 | } | |
1569 | ||
1570 | /* We have a valid header line. If there were any binary zeroes in | |
1571 | the line, stomp on them here. */ | |
1572 | ||
1573 | if (had_zero > 0) | |
1574 | for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?'; | |
1575 | ||
1576 | /* It is perfectly legal to have an empty continuation line | |
1577 | at the end of a header, but it is confusing to humans | |
1578 | looking at such messages, since it looks like a blank line. | |
1579 | Reduce confusion by removing redundant white space at the | |
1580 | end. We know that there is at least one printing character | |
1581 | (the ':' tested for above) so there is no danger of running | |
1582 | off the end. */ | |
1583 | ||
1584 | p = next->text + ptr - 2; | |
1585 | for (;;) | |
1586 | { | |
1587 | while (*p == ' ' || *p == '\t') p--; | |
1588 | if (*p != '\n') break; | |
1589 | ptr = (p--) - next->text + 1; | |
1590 | message_size -= next->slen - ptr; | |
1591 | next->text[ptr] = 0; | |
1592 | next->slen = ptr; | |
1593 | } | |
1594 | ||
1595 | /* Add the header to the chain */ | |
1596 | ||
1597 | next->type = htype_other; | |
1598 | next->next = NULL; | |
1599 | header_last->next = next; | |
1600 | header_last = next; | |
1601 | ||
1602 | /* Check the limit for individual line lengths. This comes after adding to | |
1603 | the chain so that the failing line is reflected if a bounce is generated | |
1604 | (for a local message). */ | |
1605 | ||
1606 | if (header_line_maxsize > 0 && next->slen > header_line_maxsize) | |
1607 | { | |
1608 | log_write(0, LOG_MAIN, "overlong message header line received from " | |
1609 | "%s (more than %d characters): message abandoned", | |
1610 | sender_host_unknown? sender_ident : sender_fullhost, | |
1611 | header_line_maxsize); | |
1612 | ||
1613 | if (smtp_input) | |
1614 | { | |
1615 | smtp_reply = US"552 A message header line is too long"; | |
1616 | receive_swallow_smtp(); | |
1617 | goto TIDYUP; /* Skip to end of function */ | |
1618 | } | |
1619 | ||
1620 | else | |
1621 | { | |
1622 | give_local_error(ERRMESS_VLONGHDRLINE, | |
1623 | string_sprintf("message header line longer than %d characters " | |
1624 | "received: message not accepted", header_line_maxsize), US"", | |
1625 | error_rc, stdin, header_list->next); | |
1626 | /* Does not return */ | |
1627 | } | |
1628 | } | |
1629 | ||
1630 | /* Note if any resent- fields exist. */ | |
1631 | ||
1632 | if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0) | |
1633 | { | |
1634 | resents_exist = TRUE; | |
1635 | resent_prefix = US"Resent-"; | |
1636 | } | |
1637 | } | |
1638 | ||
1639 | /* The line has been handled. If we have hit EOF, break out of the loop, | |
1640 | indicating no pending data line. */ | |
1641 | ||
1642 | if (ch == EOF) { next = NULL; break; } | |
1643 | ||
1644 | /* Set up for the next header */ | |
1645 | ||
1646 | header_size = 256; | |
1647 | next = store_get(sizeof(header_line)); | |
1648 | next->text = store_get(header_size); | |
1649 | ptr = 0; | |
1650 | had_zero = 0; | |
1651 | } /* Continue, starting to read the next header */ | |
1652 | ||
1653 | /* At this point, we have read all the headers into a data structure in main | |
1654 | store. The first header is still the dummy placeholder for the Received: header | |
1655 | we are going to generate a bit later on. If next != NULL, it contains the first | |
1656 | data line - which terminated the headers before reaching a blank line (not the | |
1657 | normal case). */ | |
1658 | ||
1659 | DEBUG(D_receive) | |
1660 | { | |
1661 | debug_printf(">>Headers received:\n"); | |
1662 | for (h = header_list->next; h != NULL; h = h->next) | |
1663 | debug_printf("%s", h->text); | |
1664 | debug_printf("\n"); | |
1665 | } | |
1666 | ||
1667 | /* End of file on any SMTP connection is an error. If an incoming SMTP call | |
1668 | is dropped immediately after valid headers, the next thing we will see is EOF. | |
1669 | We must test for this specially, as further down the reading of the data is | |
1670 | skipped if already at EOF. */ | |
1671 | ||
1672 | if (smtp_input && (receive_feof)()) | |
1673 | { | |
1674 | smtp_reply = handle_lost_connection(US" (after header)"); | |
1675 | smtp_yield = FALSE; | |
1676 | goto TIDYUP; /* Skip to end of function */ | |
1677 | } | |
1678 | ||
1679 | /* If this is a filter test run and no headers were read, output a warning | |
1680 | in case there is a mistake in the test message. */ | |
1681 | ||
f05da2e8 | 1682 | if (filter_test != FTEST_NONE && header_list->next == NULL) |
059ec3d9 PH |
1683 | printf("Warning: no message headers read\n"); |
1684 | ||
1685 | ||
1686 | /* Scan the headers to identify them. Some are merely marked for later | |
1687 | processing; some are dealt with here. */ | |
1688 | ||
1689 | for (h = header_list->next; h != NULL; h = h->next) | |
1690 | { | |
1691 | BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0; | |
1692 | if (is_resent) contains_resent_headers = TRUE; | |
1693 | ||
1694 | switch (header_checkname(h, is_resent)) | |
1695 | { | |
1696 | /* "Bcc:" gets flagged, and its existence noted, whether it's resent- or | |
1697 | not. */ | |
1698 | ||
1699 | case htype_bcc: | |
1700 | h->type = htype_bcc; | |
1701 | /**** | |
1702 | bcc_header_exists = TRUE; | |
1703 | ****/ | |
1704 | break; | |
1705 | ||
1706 | /* "Cc:" gets flagged, and the existence of a recipient header is noted, | |
1707 | whether it's resent- or not. */ | |
1708 | ||
1709 | case htype_cc: | |
1710 | h->type = htype_cc; | |
1711 | /**** | |
1712 | to_or_cc_header_exists = TRUE; | |
1713 | ****/ | |
1714 | break; | |
1715 | ||
1716 | /* Record whether a Date: or Resent-Date: header exists, as appropriate. */ | |
1717 | ||
1718 | case htype_date: | |
1719 | date_header_exists = !resents_exist || is_resent; | |
1720 | break; | |
1721 | ||
1722 | /* Same comments as about Return-Path: below. */ | |
1723 | ||
1724 | case htype_delivery_date: | |
1725 | if (delivery_date_remove) h->type = htype_old; | |
1726 | break; | |
1727 | ||
1728 | /* Same comments as about Return-Path: below. */ | |
1729 | ||
1730 | case htype_envelope_to: | |
1731 | if (envelope_to_remove) h->type = htype_old; | |
1732 | break; | |
1733 | ||
1734 | /* Mark all "From:" headers so they get rewritten. Save the one that is to | |
1735 | be used for Sender: checking. For Sendmail compatibility, if the "From:" | |
1736 | header consists of just the login id of the user who called Exim, rewrite | |
1737 | it with the gecos field first. Apply this rule to Resent-From: if there | |
1738 | are resent- fields. */ | |
1739 | ||
1740 | case htype_from: | |
1741 | h->type = htype_from; | |
1742 | if (!resents_exist || is_resent) | |
1743 | { | |
1744 | from_header = h; | |
1745 | if (!smtp_input) | |
1746 | { | |
1747 | uschar *s = Ustrchr(h->text, ':') + 1; | |
1748 | while (isspace(*s)) s++; | |
1749 | if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0) | |
1750 | { | |
1751 | uschar *name = is_resent? US"Resent-From" : US"From"; | |
1752 | header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name, | |
1753 | originator_login, qualify_domain_sender); | |
1754 | from_header = header_last; | |
1755 | h->type = htype_old; | |
1756 | DEBUG(D_receive|D_rewrite) | |
1757 | debug_printf("rewrote \"%s:\" header using gecos\n", name); | |
1758 | } | |
1759 | } | |
1760 | } | |
1761 | break; | |
1762 | ||
1763 | /* Identify the Message-id: header for generating "in-reply-to" in the | |
1764 | autoreply transport. For incoming logging, save any resent- value. In both | |
1765 | cases, take just the first of any multiples. */ | |
1766 | ||
1767 | case htype_id: | |
1768 | if (msgid_header == NULL && (!resents_exist || is_resent)) | |
1769 | { | |
1770 | msgid_header = h; | |
1771 | h->type = htype_id; | |
1772 | } | |
1773 | break; | |
1774 | ||
1775 | /* Flag all Received: headers */ | |
1776 | ||
1777 | case htype_received: | |
1778 | h->type = htype_received; | |
1779 | received_count++; | |
1780 | break; | |
1781 | ||
1782 | /* "Reply-to:" is just noted (there is no resent-reply-to field) */ | |
1783 | ||
1784 | case htype_reply_to: | |
1785 | h->type = htype_reply_to; | |
1786 | break; | |
1787 | ||
1788 | /* The Return-path: header is supposed to be added to messages when | |
1789 | they leave the SMTP system. We shouldn't receive messages that already | |
1790 | contain Return-path. However, since Exim generates Return-path: on | |
1791 | local delivery, resent messages may well contain it. We therefore | |
1792 | provide an option (which defaults on) to remove any Return-path: headers | |
1793 | on input. Removal actually means flagging as "old", which prevents the | |
1794 | header being transmitted with the message. */ | |
1795 | ||
1796 | case htype_return_path: | |
1797 | if (return_path_remove) h->type = htype_old; | |
1798 | ||
1799 | /* If we are testing a mail filter file, use the value of the | |
1800 | Return-Path: header to set up the return_path variable, which is not | |
1801 | otherwise set. However, remove any <> that surround the address | |
1802 | because the variable doesn't have these. */ | |
1803 | ||
f05da2e8 | 1804 | if (filter_test != FTEST_NONE) |
059ec3d9 PH |
1805 | { |
1806 | uschar *start = h->text + 12; | |
1807 | uschar *end = start + Ustrlen(start); | |
1808 | while (isspace(*start)) start++; | |
1809 | while (end > start && isspace(end[-1])) end--; | |
1810 | if (*start == '<' && end[-1] == '>') | |
1811 | { | |
1812 | start++; | |
1813 | end--; | |
1814 | } | |
1815 | return_path = string_copyn(start, end - start); | |
1816 | printf("Return-path taken from \"Return-path:\" header line\n"); | |
1817 | } | |
1818 | break; | |
1819 | ||
1820 | /* If there is a "Sender:" header and the message is locally originated, | |
1821 | and from an untrusted caller, or if we are in submission mode for a remote | |
1822 | message, mark it "old" so that it will not be transmitted with the message, | |
69358f02 PH |
1823 | unless active_local_sender_retain is set. (This can only be true if |
1824 | active_local_from_check is false.) If there are any resent- headers in the | |
059ec3d9 PH |
1825 | message, apply this rule to Resent-Sender: instead of Sender:. Messages |
1826 | with multiple resent- header sets cannot be tidily handled. (For this | |
1827 | reason, at least one MUA - Pine - turns old resent- headers into X-resent- | |
1828 | headers when resending, leaving just one set.) */ | |
1829 | ||
1830 | case htype_sender: | |
69358f02 PH |
1831 | h->type = ((!active_local_sender_retain && |
1832 | ((sender_local && !trusted_caller) || submission_mode) | |
059ec3d9 PH |
1833 | ) && |
1834 | (!resents_exist||is_resent))? | |
1835 | htype_old : htype_sender; | |
1836 | break; | |
1837 | ||
1838 | /* Remember the Subject: header for logging. There is no Resent-Subject */ | |
1839 | ||
1840 | case htype_subject: | |
1841 | subject_header = h; | |
1842 | break; | |
1843 | ||
1844 | /* "To:" gets flagged, and the existence of a recipient header is noted, | |
1845 | whether it's resent- or not. */ | |
1846 | ||
1847 | case htype_to: | |
1848 | h->type = htype_to; | |
1849 | /**** | |
1850 | to_or_cc_header_exists = TRUE; | |
1851 | ****/ | |
1852 | break; | |
1853 | } | |
1854 | } | |
1855 | ||
1856 | /* Extract recipients from the headers if that is required (the -t option). | |
1857 | Note that this is documented as being done *before* any address rewriting takes | |
1858 | place. There are two possibilities: | |
1859 | ||
1860 | (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any | |
1861 | recipients already listed are to be REMOVED from the message. Smail 3 works | |
1862 | like this. We need to build a non-recipients tree for that list, because in | |
1863 | subsequent processing this data is held in a tree and that's what the | |
1864 | spool_write_header() function expects. Make sure that non-recipient addresses | |
1865 | are fully qualified and rewritten if necessary. | |
1866 | ||
1867 | (2) According to other sendmail documentation, -t ADDS extracted recipients to | |
1868 | those in the command line arguments (and it is rumoured some other MTAs do | |
1869 | this). Therefore, there is an option to make Exim behave this way. | |
1870 | ||
1871 | *** Notes on "Resent-" header lines *** | |
1872 | ||
1873 | The presence of resent-headers in the message makes -t horribly ambiguous. | |
1874 | Experiments with sendmail showed that it uses recipients for all resent- | |
1875 | headers, totally ignoring the concept of "sets of resent- headers" as described | |
1876 | in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set | |
1877 | with all the addresses in one instance of each header. | |
1878 | ||
1879 | This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an | |
1880 | error for -t if there were resent- headers in the message. However, after a | |
1881 | discussion on the mailing list, I've learned that there are MUAs that use | |
1882 | resent- headers with -t, and also that the stuff about sets of resent- headers | |
1883 | and their ordering in RFC 2822 is generally ignored. An MUA that submits a | |
1884 | message with -t and resent- header lines makes sure that only *its* resent- | |
1885 | headers are present; previous ones are often renamed as X-resent- for example. | |
1886 | ||
1887 | Consequently, Exim has been changed so that, if any resent- header lines are | |
1888 | present, the recipients are taken from all of the appropriate resent- lines, | |
1889 | and not from the ordinary To:, Cc:, etc. */ | |
1890 | ||
1891 | if (extract_recip) | |
1892 | { | |
1893 | int rcount = 0; | |
1894 | error_block **bnext = &bad_addresses; | |
1895 | ||
1896 | if (extract_addresses_remove_arguments) | |
1897 | { | |
1898 | while (recipients_count-- > 0) | |
1899 | { | |
1900 | uschar *s = rewrite_address(recipients_list[recipients_count].address, | |
1901 | TRUE, TRUE, global_rewrite_rules, rewrite_existflags); | |
1902 | tree_add_nonrecipient(s); | |
1903 | } | |
1904 | recipients_list = NULL; | |
1905 | recipients_count = recipients_list_max = 0; | |
1906 | } | |
1907 | ||
1908 | parse_allow_group = TRUE; /* Allow address group syntax */ | |
1909 | ||
1910 | /* Now scan the headers */ | |
1911 | ||
1912 | for (h = header_list->next; h != NULL; h = h->next) | |
1913 | { | |
1914 | if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) && | |
1915 | (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0)) | |
1916 | { | |
1917 | uschar *s = Ustrchr(h->text, ':') + 1; | |
1918 | while (isspace(*s)) s++; | |
1919 | ||
1920 | while (*s != 0) | |
1921 | { | |
1922 | uschar *ss = parse_find_address_end(s, FALSE); | |
1923 | uschar *recipient, *errmess, *p, *pp; | |
1924 | int start, end, domain; | |
1925 | ||
1926 | /* Check on maximum */ | |
1927 | ||
1928 | if (recipients_max > 0 && ++rcount > recipients_max) | |
1929 | { | |
1930 | give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients", | |
1931 | US"message rejected: ", error_rc, stdin, NULL); | |
1932 | /* Does not return */ | |
1933 | } | |
1934 | ||
1935 | /* Make a copy of the address, and remove any internal newlines. These | |
1936 | may be present as a result of continuations of the header line. The | |
1937 | white space that follows the newline must not be removed - it is part | |
1938 | of the header. */ | |
1939 | ||
1940 | pp = recipient = store_get(ss - s + 1); | |
1941 | for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p; | |
1942 | *pp = 0; | |
1943 | recipient = parse_extract_address(recipient, &errmess, &start, &end, | |
1944 | &domain, FALSE); | |
1945 | ||
1946 | /* Keep a list of all the bad addresses so we can send a single | |
1947 | error message at the end. However, an empty address is not an error; | |
1948 | just ignore it. This can come from an empty group list like | |
1949 | ||
1950 | To: Recipients of list:; | |
1951 | ||
1952 | If there are no recipients at all, an error will occur later. */ | |
1953 | ||
1954 | if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0) | |
1955 | { | |
1956 | int len = Ustrlen(s); | |
1957 | error_block *b = store_get(sizeof(error_block)); | |
1958 | while (len > 0 && isspace(s[len-1])) len--; | |
1959 | b->next = NULL; | |
1960 | b->text1 = string_printing(string_copyn(s, len)); | |
1961 | b->text2 = errmess; | |
1962 | *bnext = b; | |
1963 | bnext = &(b->next); | |
1964 | } | |
1965 | ||
1966 | /* If the recipient is already in the nonrecipients tree, it must | |
1967 | have appeared on the command line with the option extract_addresses_ | |
1968 | remove_arguments set. Do not add it to the recipients, and keep a note | |
1969 | that this has happened, in order to give a better error if there are | |
1970 | no recipients left. */ | |
1971 | ||
1972 | else if (recipient != NULL) | |
1973 | { | |
1974 | if (tree_search(tree_nonrecipients, recipient) == NULL) | |
1975 | receive_add_recipient(recipient, -1); | |
1976 | else | |
1977 | extracted_ignored = TRUE; | |
1978 | } | |
1979 | ||
1980 | /* Move on past this address */ | |
1981 | ||
1982 | s = ss + (*ss? 1:0); | |
1983 | while (isspace(*s)) s++; | |
1984 | } | |
1985 | ||
1986 | /* If this was the bcc: header, mark it "old", which means it | |
1987 | will be kept on the spool, but not transmitted as part of the | |
1988 | message. */ | |
1989 | ||
1990 | if (h->type == htype_bcc) | |
1991 | { | |
1992 | h->type = htype_old; | |
1993 | /**** | |
1994 | bcc_header_exists = FALSE; | |
1995 | ****/ | |
1996 | } | |
1997 | } /* For appropriate header line */ | |
1998 | } /* For each header line */ | |
1999 | ||
2000 | parse_allow_group = FALSE; /* Reset group syntax flags */ | |
2001 | parse_found_group = FALSE; | |
2002 | } | |
2003 | ||
2004 | /* Now build the unique message id. This has changed several times over the | |
2005 | lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003). | |
2006 | Retaining all the history in the comment has become too unwieldy - read | |
2007 | previous release sources if you want it. | |
2008 | ||
2009 | The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62. | |
2010 | The first part is the current time, in seconds. The second part is the current | |
2011 | pid. Both are large enough to hold 32-bit numbers in base 62. The third part | |
2012 | can hold a number in the range 0-3843. It used to be a computed sequence | |
2013 | number, but is now the fractional component of the current time in units of | |
2014 | 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been | |
2015 | received, Exim ensures that the timer has ticked at the appropriate level | |
2016 | before proceeding, to avoid duplication if the pid happened to be re-used | |
2017 | within the same time period. It seems likely that most messages will take at | |
2018 | least half a millisecond to be received, so no delay will normally be | |
2019 | necessary. At least for some time... | |
2020 | ||
2021 | There is a modification when localhost_number is set. Formerly this was allowed | |
2022 | to be as large as 255. Now it is restricted to the range 0-16, and the final | |
2023 | component of the message id becomes (localhost_number * 200) + fractional time | |
2024 | in units of 1/200 of a second (i.e. a value in the range 0-3399). | |
2025 | ||
2026 | Some not-really-Unix operating systems use case-insensitive file names (Darwin, | |
2027 | Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this | |
2028 | still allows the tttttt field to hold a large enough number to last for some | |
2029 | more decades, and the final two-digit field can hold numbers up to 1295, which | |
2030 | is enough for milliseconds (instead of 1/2000 of a second). | |
2031 | ||
2032 | However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit | |
2033 | pid, so it is probably safe because pids have to be positive. The | |
2034 | localhost_number is restricted to 0-10 for these hosts, and when it is set, the | |
2035 | final field becomes (localhost_number * 100) + fractional time in centiseconds. | |
2036 | ||
2037 | Note that string_base62() returns its data in a static storage block, so it | |
2038 | must be copied before calling string_base62() again. It always returns exactly | |
2039 | 6 characters. | |
2040 | ||
2041 | There doesn't seem to be anything in the RFC which requires a message id to | |
2042 | start with a letter, but Smail was changed to ensure this. The external form of | |
2043 | the message id (as supplied by string expansion) therefore starts with an | |
2044 | additional leading 'E'. The spool file names do not include this leading | |
2045 | letter and it is not used internally. | |
2046 | ||
2047 | NOTE: If ever the format of message ids is changed, the regular expression for | |
2048 | checking that a string is in this format must be updated in a corresponding | |
2049 | way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH | |
2050 | must also be changed to reflect the correct string length. Then, of course, | |
2051 | other programs that rely on the message id format will need updating too. */ | |
2052 | ||
2053 | Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6); | |
2054 | message_id[6] = '-'; | |
2055 | Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6); | |
2056 | ||
2057 | /* Deal with the case where the host number is set. The value of the number was | |
2058 | checked when it was read, to ensure it isn't too big. The timing granularity is | |
2059 | left in id_resolution so that an appropriate wait can be done after receiving | |
2060 | the message, if necessary (we hope it won't be). */ | |
2061 | ||
2062 | if (host_number_string != NULL) | |
2063 | { | |
2064 | id_resolution = (BASE_62 == 62)? 5000 : 10000; | |
2065 | sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s", | |
2066 | string_base62((long int)( | |
2067 | host_number * (1000000/id_resolution) + | |
2068 | message_id_tv.tv_usec/id_resolution)) + 4); | |
2069 | } | |
2070 | ||
2071 | /* Host number not set: final field is just the fractional time at an | |
2072 | appropriate resolution. */ | |
2073 | ||
2074 | else | |
2075 | { | |
2076 | id_resolution = (BASE_62 == 62)? 500 : 1000; | |
2077 | sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s", | |
2078 | string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4); | |
2079 | } | |
2080 | ||
2081 | /* Add the current message id onto the current process info string if | |
2082 | it will fit. */ | |
2083 | ||
2084 | (void)string_format(process_info + process_info_len, | |
2085 | PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id); | |
2086 | ||
2087 | /* If we are using multiple input directories, set up the one for this message | |
2088 | to be the least significant base-62 digit of the time of arrival. Otherwise | |
2089 | ensure that it is an empty string. */ | |
2090 | ||
2091 | message_subdir[0] = split_spool_directory? message_id[5] : 0; | |
2092 | ||
2093 | /* Now that we have the message-id, if there is no message-id: header, generate | |
2094 | one, but only for local or submission mode messages. This can be | |
2095 | user-configured if required, but we had better flatten any illegal characters | |
2096 | therein. */ | |
2097 | ||
2098 | if (msgid_header == NULL && (sender_host_address == NULL || submission_mode)) | |
2099 | { | |
2100 | uschar *p; | |
2101 | uschar *id_text = US""; | |
2102 | uschar *id_domain = primary_hostname; | |
2103 | ||
2104 | /* Permit only letters, digits, dots, and hyphens in the domain */ | |
2105 | ||
2106 | if (message_id_domain != NULL) | |
2107 | { | |
2108 | uschar *new_id_domain = expand_string(message_id_domain); | |
2109 | if (new_id_domain == NULL) | |
2110 | { | |
2111 | if (!expand_string_forcedfail) | |
2112 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2113 | "expansion of \"%s\" (message_id_header_domain) " | |
2114 | "failed: %s", message_id_domain, expand_string_message); | |
2115 | } | |
2116 | else if (*new_id_domain != 0) | |
2117 | { | |
2118 | id_domain = new_id_domain; | |
2119 | for (p = id_domain; *p != 0; p++) | |
2120 | if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */ | |
2121 | } | |
2122 | } | |
2123 | ||
2124 | /* Permit all characters except controls and RFC 2822 specials in the | |
2125 | additional text part. */ | |
2126 | ||
2127 | if (message_id_text != NULL) | |
2128 | { | |
2129 | uschar *new_id_text = expand_string(message_id_text); | |
2130 | if (new_id_text == NULL) | |
2131 | { | |
2132 | if (!expand_string_forcedfail) | |
2133 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2134 | "expansion of \"%s\" (message_id_header_text) " | |
2135 | "failed: %s", message_id_text, expand_string_message); | |
2136 | } | |
2137 | else if (*new_id_text != 0) | |
2138 | { | |
2139 | id_text = new_id_text; | |
2140 | for (p = id_text; *p != 0; p++) | |
2141 | if (mac_iscntrl_or_special(*p)) *p = '-'; | |
2142 | } | |
2143 | } | |
2144 | ||
2145 | /* Add the header line */ | |
2146 | ||
2147 | header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, | |
2148 | message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain); | |
2149 | } | |
2150 | ||
2151 | /* If we are to log recipients, keep a copy of the raw ones before any possible | |
2152 | rewriting. Must copy the count, because later ACLs and the local_scan() | |
2153 | function may mess with the real recipients. */ | |
2154 | ||
2155 | if ((log_extra_selector & LX_received_recipients) != 0) | |
2156 | { | |
2157 | raw_recipients = store_get(recipients_count * sizeof(uschar *)); | |
2158 | for (i = 0; i < recipients_count; i++) | |
2159 | raw_recipients[i] = string_copy(recipients_list[i].address); | |
2160 | raw_recipients_count = recipients_count; | |
2161 | } | |
2162 | ||
2163 | /* Ensure the recipients list is fully qualified and rewritten. Unqualified | |
2164 | recipients will get here only if the conditions were right (allow_unqualified_ | |
2165 | recipient is TRUE). */ | |
2166 | ||
2167 | for (i = 0; i < recipients_count; i++) | |
2168 | recipients_list[i].address = | |
2169 | rewrite_address(recipients_list[i].address, TRUE, TRUE, | |
2170 | global_rewrite_rules, rewrite_existflags); | |
2171 | ||
2172 | /* If there is no From: header, generate one for local or submission_mode | |
2173 | messages. If there is no sender address, but the sender is local or this is a | |
2174 | local delivery error, use the originator login. This shouldn't happen for | |
2175 | genuine bounces, but might happen for autoreplies. The addition of From: must | |
2176 | be done *before* checking for the possible addition of a Sender: header, | |
2177 | because untrusted_set_sender allows an untrusted user to set anything in the | |
2178 | envelope (which might then get info From:) but we still want to ensure a valid | |
2179 | Sender: if it is required. */ | |
2180 | ||
2181 | if (from_header == NULL && (sender_host_address == NULL || submission_mode)) | |
2182 | { | |
2183 | /* Envelope sender is empty */ | |
2184 | ||
2185 | if (sender_address[0] == 0) | |
2186 | { | |
2187 | if (sender_local || local_error_message) | |
2188 | { | |
2189 | header_add(htype_from, "%sFrom: %s%s%s@%s%s\n", resent_prefix, | |
2190 | originator_name, | |
2191 | (originator_name[0] == 0)? "" : " <", | |
2192 | local_part_quote(originator_login), | |
2193 | qualify_domain_sender, | |
2194 | (originator_name[0] == 0)? "" : ">"); | |
2195 | } | |
2196 | else if (submission_mode && authenticated_id != NULL) | |
2197 | { | |
2198 | if (submission_domain == NULL) | |
2199 | { | |
2200 | header_add(htype_from, "%sFrom: %s@%s\n", resent_prefix, | |
2201 | local_part_quote(authenticated_id), qualify_domain_sender); | |
2202 | } | |
2203 | else if (submission_domain[0] == 0) /* empty => whole address set */ | |
2204 | { | |
2205 | header_add(htype_from, "%sFrom: %s\n", resent_prefix, | |
2206 | authenticated_id); | |
2207 | } | |
2208 | else | |
2209 | { | |
2210 | header_add(htype_from, "%sFrom: %s@%s\n", resent_prefix, | |
2211 | local_part_quote(authenticated_id), submission_domain); | |
2212 | } | |
2213 | from_header = header_last; /* To get it checked for Sender: */ | |
2214 | } | |
2215 | } | |
2216 | ||
2217 | /* There is a non-null envelope sender. Build the header using the original | |
2218 | sender address, before any rewriting that might have been done while | |
2219 | verifying it. */ | |
2220 | ||
2221 | else | |
2222 | { | |
2223 | if (!smtp_input || sender_local) | |
2224 | header_add(htype_from, "%sFrom: %s%s%s%s\n", | |
2225 | resent_prefix, originator_name, | |
2226 | (originator_name[0] == 0)? "" : " <", | |
2227 | (sender_address_unrewritten == NULL)? | |
2228 | sender_address : sender_address_unrewritten, | |
2229 | (originator_name[0] == 0)? "" : ">"); | |
2230 | else | |
2231 | header_add(htype_from, "%sFrom: %s\n", resent_prefix, sender_address); | |
2232 | ||
2233 | from_header = header_last; /* To get it checked for Sender: */ | |
2234 | } | |
2235 | } | |
2236 | ||
2237 | ||
2238 | /* If the sender is local, or if we are in submission mode and there is an | |
2239 | authenticated_id, check that an existing From: is correct, and if not, generate | |
2240 | a Sender: header, unless disabled. Any previously-existing Sender: header was | |
2241 | removed above. Note that sender_local, as well as being TRUE if the caller of | |
2242 | exim is not trusted, is also true if a trusted caller did not supply a -f | |
2243 | argument for non-smtp input. To allow trusted callers to forge From: without | |
2244 | supplying -f, we have to test explicitly here. If the From: header contains | |
2245 | more than one address, then the call to parse_extract_address fails, and a | |
2246 | Sender: header is inserted, as required. */ | |
2247 | ||
2248 | if (from_header != NULL && | |
69358f02 PH |
2249 | (active_local_from_check && |
2250 | ((sender_local && !trusted_caller) || | |
2251 | (submission_mode && authenticated_id != NULL)) | |
059ec3d9 PH |
2252 | )) |
2253 | { | |
2254 | BOOL make_sender = TRUE; | |
2255 | int start, end, domain; | |
2256 | uschar *errmess; | |
2257 | uschar *from_address = | |
2258 | parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess, | |
2259 | &start, &end, &domain, FALSE); | |
2260 | uschar *generated_sender_address; | |
2261 | ||
2262 | if (submission_mode) | |
2263 | { | |
2264 | if (submission_domain == NULL) | |
2265 | { | |
2266 | generated_sender_address = string_sprintf("%s@%s", | |
2267 | local_part_quote(authenticated_id), qualify_domain_sender); | |
2268 | } | |
2269 | else if (submission_domain[0] == 0) /* empty => full address */ | |
2270 | { | |
2271 | generated_sender_address = string_sprintf("%s", | |
2272 | authenticated_id); | |
2273 | } | |
2274 | else | |
2275 | { | |
2276 | generated_sender_address = string_sprintf("%s@%s", | |
2277 | local_part_quote(authenticated_id), submission_domain); | |
2278 | } | |
2279 | } | |
2280 | else | |
2281 | generated_sender_address = string_sprintf("%s@%s", | |
2282 | local_part_quote(originator_login), qualify_domain_sender); | |
2283 | ||
2284 | /* Remove permitted prefixes and suffixes from the local part of the From: | |
2285 | address before doing the comparison with the generated sender. */ | |
2286 | ||
2287 | if (from_address != NULL) | |
2288 | { | |
2289 | int slen; | |
2290 | uschar *at = (domain == 0)? NULL : from_address + domain - 1; | |
2291 | ||
2292 | if (at != NULL) *at = 0; | |
2293 | from_address += route_check_prefix(from_address, local_from_prefix); | |
2294 | slen = route_check_suffix(from_address, local_from_suffix); | |
2295 | if (slen > 0) | |
2296 | { | |
2297 | memmove(from_address+slen, from_address, Ustrlen(from_address)-slen); | |
2298 | from_address += slen; | |
2299 | } | |
2300 | if (at != NULL) *at = '@'; | |
2301 | ||
2302 | if (strcmpic(generated_sender_address, from_address) == 0 || | |
2303 | (domain == 0 && strcmpic(from_address, originator_login) == 0)) | |
2304 | make_sender = FALSE; | |
2305 | } | |
2306 | ||
2307 | /* We have to cause the Sender header to be rewritten if there are | |
2308 | appropriate rewriting rules. */ | |
2309 | ||
2310 | if (make_sender) | |
2311 | { | |
2312 | if (submission_mode) | |
2313 | header_add(htype_sender, "%sSender: %s\n", resent_prefix, | |
2314 | generated_sender_address); | |
2315 | else | |
2316 | header_add(htype_sender, "%sSender: %s <%s>\n", | |
2317 | resent_prefix, originator_name, generated_sender_address); | |
2318 | } | |
2319 | } | |
2320 | ||
2321 | ||
2322 | /* If there are any rewriting rules, apply them to the sender address, unless | |
2323 | it has already been rewritten as part of verification for SMTP input. */ | |
2324 | ||
2325 | if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL && | |
2326 | sender_address[0] != 0) | |
2327 | { | |
2328 | sender_address = rewrite_address(sender_address, FALSE, TRUE, | |
2329 | global_rewrite_rules, rewrite_existflags); | |
2330 | DEBUG(D_receive|D_rewrite) | |
2331 | debug_printf("rewritten sender = %s\n", sender_address); | |
2332 | } | |
2333 | ||
2334 | ||
2335 | /* The headers must be run through rewrite_header(), because it ensures that | |
2336 | addresses are fully qualified, as well as applying any rewriting rules that may | |
2337 | exist. | |
2338 | ||
2339 | Qualification of header addresses in a message from a remote host happens only | |
2340 | if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as | |
2341 | appropriate. For local messages, qualification always happens, unless -bnq is | |
2342 | used to explicitly suppress it. No rewriting is done for an unqualified address | |
2343 | that is left untouched. | |
2344 | ||
2345 | We start at the second header, skipping our own Received:. This rewriting is | |
2346 | documented as happening *after* recipient addresses are taken from the headers | |
2347 | by the -t command line option. An added Sender: gets rewritten here. */ | |
2348 | ||
2349 | for (h = header_list->next; h != NULL; h = h->next) | |
2350 | { | |
2351 | header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules, | |
2352 | rewrite_existflags, TRUE); | |
2353 | if (newh != NULL) h = newh; | |
2354 | } | |
2355 | ||
2356 | ||
2357 | /* An RFC 822 (sic) message is not legal unless it has at least one of "to", | |
2358 | "cc", or "bcc". Note that although the minimal examples in RFC822 show just | |
2359 | "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header | |
2360 | exists, this applies to the set of resent- headers rather than the normal set. | |
2361 | ||
2362 | The requirement for a recipient header has been removed in RFC 2822. Earlier | |
2363 | versions of Exim added a To: header for locally submitted messages, and an | |
2364 | empty Bcc: header for others or when always_bcc was set. In the light of the | |
2365 | changes in RFC 2822, we now always add Bcc: just in case there are still MTAs | |
2366 | out there that insist on the RFC 822 syntax. | |
2367 | ||
2368 | November 2003: While generally revising what Exim does to fix up headers, it | |
2369 | seems like a good time to remove this altogether. */ | |
2370 | ||
2371 | /****** | |
2372 | if (!to_or_cc_header_exists && !bcc_header_exists) | |
2373 | header_add(htype_bcc, "Bcc:\n"); | |
2374 | ******/ | |
2375 | ||
2376 | /* If there is no date header, generate one if the message originates locally | |
2377 | (i.e. not over TCP/IP) or the submission mode flag is set. Messages without | |
2378 | Date: are not valid, but it seems to be more confusing if Exim adds one to | |
2379 | all remotely-originated messages. */ | |
2380 | ||
2381 | if (!date_header_exists && (sender_host_address == NULL || submission_mode)) | |
2382 | header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full)); | |
2383 | ||
2384 | search_tidyup(); /* Free any cached resources */ | |
2385 | ||
2386 | /* Show the complete set of headers if debugging. Note that the first one (the | |
2387 | new Received:) has not yet been set. */ | |
2388 | ||
2389 | DEBUG(D_receive) | |
2390 | { | |
2391 | debug_printf(">>Headers after rewriting and local additions:\n"); | |
2392 | for (h = header_list->next; h != NULL; h = h->next) | |
2393 | debug_printf("%c %s", h->type, h->text); | |
2394 | debug_printf("\n"); | |
2395 | } | |
2396 | ||
2397 | /* The headers are now complete in store. If we are running in filter | |
2398 | testing mode, that is all this function does. Return TRUE if the message | |
2399 | ended with a dot. */ | |
2400 | ||
f05da2e8 | 2401 | if (filter_test != FTEST_NONE) |
059ec3d9 PH |
2402 | { |
2403 | process_info[process_info_len] = 0; | |
2404 | return message_ended == END_DOT; | |
2405 | } | |
2406 | ||
2407 | /* Open a new spool file for the data portion of the message. We need | |
2408 | to access it both via a file descriptor and a stream. Try to make the | |
2409 | directory if it isn't there. Note re use of sprintf: spool_directory | |
2410 | is checked on input to be < 200 characters long. */ | |
2411 | ||
2412 | sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir, | |
2413 | message_id); | |
2414 | data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE); | |
2415 | if (data_fd < 0) | |
2416 | { | |
2417 | if (errno == ENOENT) | |
2418 | { | |
2419 | uschar temp[16]; | |
2420 | sprintf(CS temp, "input/%s", message_subdir); | |
2421 | if (message_subdir[0] == 0) temp[5] = 0; | |
2422 | (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE); | |
2423 | data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE); | |
2424 | } | |
2425 | if (data_fd < 0) | |
2426 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s", | |
2427 | spool_name, strerror(errno)); | |
2428 | } | |
2429 | ||
2430 | /* Make sure the file's group is the Exim gid, and double-check the mode | |
2431 | because the group setting doesn't always get set automatically. */ | |
2432 | ||
2433 | fchown(data_fd, exim_uid, exim_gid); | |
2434 | fchmod(data_fd, SPOOL_MODE); | |
2435 | ||
2436 | /* We now have data file open. Build a stream for it and lock it. We lock only | |
2437 | the first line of the file (containing the message ID) because otherwise there | |
2438 | are problems when Exim is run under Cygwin (I'm told). See comments in | |
2439 | spool_in.c, where the same locking is done. */ | |
2440 | ||
2441 | data_file = fdopen(data_fd, "w+"); | |
2442 | lock_data.l_type = F_WRLCK; | |
2443 | lock_data.l_whence = SEEK_SET; | |
2444 | lock_data.l_start = 0; | |
2445 | lock_data.l_len = SPOOL_DATA_START_OFFSET; | |
2446 | ||
2447 | if (fcntl(data_fd, F_SETLK, &lock_data) < 0) | |
2448 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name, | |
2449 | errno, strerror(errno)); | |
2450 | ||
2451 | /* We have an open, locked data file. Write the message id to it to make it | |
2452 | self-identifying. Then read the remainder of the input of this message and | |
2453 | write it to the data file. If the variable next != NULL, it contains the first | |
2454 | data line (which was read as a header but then turned out not to have the right | |
2455 | format); write it (remembering that it might contain binary zeros). The result | |
2456 | of fwrite() isn't inspected; instead we call ferror() below. */ | |
2457 | ||
2458 | fprintf(data_file, "%s-D\n", message_id); | |
2459 | if (next != NULL) | |
2460 | { | |
2461 | uschar *s = next->text; | |
2462 | int len = next->slen; | |
2463 | fwrite(s, 1, len, data_file); | |
2464 | body_linecount++; /* Assumes only 1 line */ | |
2465 | } | |
2466 | ||
2467 | /* Note that we might already be at end of file, or the logical end of file | |
2468 | (indicated by '.'), or might have encountered an error while writing the | |
2469 | message id or "next" line. */ | |
2470 | ||
2471 | if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT) | |
2472 | { | |
2473 | if (smtp_input) | |
2474 | { | |
2475 | message_ended = read_message_data_smtp(data_file); | |
2476 | receive_linecount++; /* The terminating "." line */ | |
2477 | } | |
2478 | else message_ended = read_message_data(data_file); | |
2479 | ||
2480 | receive_linecount += body_linecount; /* For BSMTP errors mainly */ | |
2481 | ||
2482 | /* Handle premature termination of SMTP */ | |
2483 | ||
2484 | if (smtp_input && message_ended == END_EOF) | |
2485 | { | |
2486 | Uunlink(spool_name); /* Lose data file when closed */ | |
2487 | message_id[0] = 0; /* Indicate no message accepted */ | |
2488 | smtp_reply = handle_lost_connection(US""); | |
2489 | smtp_yield = FALSE; | |
2490 | goto TIDYUP; /* Skip to end of function */ | |
2491 | } | |
2492 | ||
2493 | /* Handle message that is too big. Don't use host_or_ident() in the log | |
2494 | message; we want to see the ident value even for non-remote messages. */ | |
2495 | ||
2496 | if (message_ended == END_SIZE) | |
2497 | { | |
2498 | Uunlink(spool_name); /* Lose the data file when closed */ | |
2499 | if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */ | |
2500 | ||
2501 | log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: " | |
2502 | "message too big: read=%d max=%d", | |
2503 | sender_address, | |
2504 | (sender_fullhost == NULL)? "" : " H=", | |
2505 | (sender_fullhost == NULL)? US"" : sender_fullhost, | |
2506 | (sender_ident == NULL)? "" : " U=", | |
2507 | (sender_ident == NULL)? US"" : sender_ident, | |
2508 | message_size, | |
2509 | thismessage_size_limit); | |
2510 | ||
2511 | if (smtp_input) | |
2512 | { | |
2513 | smtp_reply = US"552 Message size exceeds maximum permitted"; | |
2514 | message_id[0] = 0; /* Indicate no message accepted */ | |
2515 | goto TIDYUP; /* Skip to end of function */ | |
2516 | } | |
2517 | else | |
2518 | { | |
2519 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
2520 | give_local_error(ERRMESS_TOOBIG, | |
2521 | string_sprintf("message too big (max=%d)", thismessage_size_limit), | |
2522 | US"message rejected: ", error_rc, data_file, header_list); | |
2523 | /* Does not return */ | |
2524 | } | |
2525 | } | |
2526 | } | |
2527 | ||
2528 | /* Restore the standard SIGALRM handler for any subsequent processing. (For | |
2529 | example, there may be some expansion in an ACL that uses a timer.) */ | |
2530 | ||
2531 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
2532 | ||
2533 | /* The message body has now been read into the data file. Call fflush() to | |
2534 | empty the buffers in C, and then call fsync() to get the data written out onto | |
2535 | the disk, as fflush() doesn't do this (or at least, it isn't documented as | |
2536 | having to do this). If there was an I/O error on either input or output, | |
2537 | attempt to send an error message, and unlink the spool file. For non-SMTP input | |
2538 | we can then give up. Note that for SMTP input we must swallow the remainder of | |
2539 | the input in cases of output errors, since the far end doesn't expect to see | |
2540 | anything until the terminating dot line is sent. */ | |
2541 | ||
2542 | if (fflush(data_file) == EOF || ferror(data_file) || | |
2543 | fsync(fileno(data_file)) < 0 || (receive_ferror)()) | |
2544 | { | |
2545 | uschar *msg_errno = US strerror(errno); | |
2546 | BOOL input_error = (receive_ferror)() != 0; | |
2547 | uschar *msg = string_sprintf("%s error (%s) while receiving message from %s", | |
2548 | input_error? "Input read" : "Spool write", | |
2549 | msg_errno, | |
2550 | (sender_fullhost != NULL)? sender_fullhost : sender_ident); | |
2551 | ||
2552 | log_write(0, LOG_MAIN, "Message abandoned: %s", msg); | |
2553 | Uunlink(spool_name); /* Lose the data file */ | |
2554 | ||
2555 | if (smtp_input) | |
2556 | { | |
2557 | if (input_error) | |
2558 | smtp_reply = US"451 Error while reading input data"; | |
2559 | else | |
2560 | { | |
2561 | smtp_reply = US"451 Error while writing spool file"; | |
2562 | receive_swallow_smtp(); | |
2563 | } | |
2564 | message_id[0] = 0; /* Indicate no message accepted */ | |
2565 | goto TIDYUP; /* Skip to end of function */ | |
2566 | } | |
2567 | ||
2568 | else | |
2569 | { | |
2570 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
2571 | give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file, | |
2572 | header_list); | |
2573 | /* Does not return */ | |
2574 | } | |
2575 | } | |
2576 | ||
2577 | ||
2578 | /* No I/O errors were encountered while writing the data file. */ | |
2579 | ||
2580 | DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id); | |
2581 | ||
2582 | ||
2583 | /* If there were any bad addresses extracted by -t, or there were no recipients | |
2584 | left after -t, send a message to the sender of this message, or write it to | |
2585 | stderr if the error handling option is set that way. Note that there may | |
2586 | legitimately be no recipients for an SMTP message if they have all been removed | |
2587 | by "discard". | |
2588 | ||
2589 | We need to rewind the data file in order to read it. In the case of no | |
2590 | recipients or stderr error writing, throw the data file away afterwards, and | |
2591 | exit. (This can't be SMTP, which always ensures there's at least one | |
2592 | syntactically good recipient address.) */ | |
2593 | ||
2594 | if (extract_recip && (bad_addresses != NULL || recipients_count == 0)) | |
2595 | { | |
2596 | DEBUG(D_receive) | |
2597 | { | |
2598 | if (recipients_count == 0) debug_printf("*** No recipients\n"); | |
2599 | if (bad_addresses != NULL) | |
2600 | { | |
2601 | error_block *eblock = bad_addresses; | |
2602 | debug_printf("*** Bad address(es)\n"); | |
2603 | while (eblock != NULL) | |
2604 | { | |
2605 | debug_printf(" %s: %s\n", eblock->text1, eblock->text2); | |
2606 | eblock = eblock->next; | |
2607 | } | |
2608 | } | |
2609 | } | |
2610 | ||
2611 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
2612 | ||
2613 | /* If configured to send errors to the sender, but this fails, force | |
2614 | a failure error code. We use a special one for no recipients so that it | |
2615 | can be detected by the autoreply transport. Otherwise error_rc is set to | |
2616 | errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case | |
2617 | it is EXIT_SUCCESS. */ | |
2618 | ||
2619 | if (error_handling == ERRORS_SENDER) | |
2620 | { | |
2621 | if (!moan_to_sender( | |
2622 | (bad_addresses == NULL)? | |
2623 | (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) : | |
2624 | (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS, | |
2625 | bad_addresses, header_list, data_file, FALSE)) | |
2626 | error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE; | |
2627 | } | |
2628 | else | |
2629 | { | |
2630 | if (bad_addresses == NULL) | |
2631 | { | |
2632 | if (extracted_ignored) | |
2633 | fprintf(stderr, "exim: all -t recipients overridden by command line\n"); | |
2634 | else | |
2635 | fprintf(stderr, "exim: no recipients in message\n"); | |
2636 | } | |
2637 | else | |
2638 | { | |
2639 | fprintf(stderr, "exim: invalid address%s", | |
2640 | (bad_addresses->next == NULL)? ":" : "es:\n"); | |
2641 | while (bad_addresses != NULL) | |
2642 | { | |
2643 | fprintf(stderr, " %s: %s\n", bad_addresses->text1, | |
2644 | bad_addresses->text2); | |
2645 | bad_addresses = bad_addresses->next; | |
2646 | } | |
2647 | } | |
2648 | } | |
2649 | ||
2650 | if (recipients_count == 0 || error_handling == ERRORS_STDERR) | |
2651 | { | |
2652 | Uunlink(spool_name); | |
2653 | fclose(data_file); | |
2654 | exim_exit(error_rc); | |
2655 | } | |
2656 | } | |
2657 | ||
2658 | /* Data file successfully written. Generate text for the Received: header by | |
2659 | expanding the configured string, and adding a timestamp. By leaving this | |
2660 | operation till now, we ensure that the timestamp is the time that message | |
2661 | reception was completed. However, this is deliberately done before calling the | |
2662 | data ACL and local_scan(). | |
2663 | ||
2664 | This Received: header may therefore be inspected by the data ACL and by code in | |
2665 | the local_scan() function. When they have run, we update the timestamp to be | |
2666 | the final time of reception. | |
2667 | ||
2668 | If there is just one recipient, set up its value in the $received_for variable | |
2669 | for use when we generate the Received: header. | |
2670 | ||
2671 | Note: the checking for too many Received: headers is handled by the delivery | |
2672 | code. */ | |
2673 | ||
2674 | timestamp = expand_string(US"${tod_full}"); | |
2675 | if (recipients_count == 1) received_for = recipients_list[0].address; | |
2676 | received = expand_string(received_header_text); | |
2677 | received_for = NULL; | |
2678 | ||
2679 | if (received == NULL) | |
2680 | { | |
2681 | Uunlink(spool_name); /* Lose the data file */ | |
2682 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" " | |
2683 | "(received_header_text) failed: %s", string_printing(received_header_text), | |
2684 | expand_string_message); | |
2685 | } | |
2686 | ||
2687 | /* The first element on the header chain is reserved for the Received header, | |
2688 | so all we have to do is fill in the text pointer, and set the type. However, if | |
2689 | the result of the expansion is an empty string, we leave the header marked as | |
2690 | "old" so as to refrain from adding a Received header. */ | |
2691 | ||
2692 | if (received[0] == 0) | |
2693 | { | |
2694 | received_header->text = string_sprintf("Received: ; %s\n", timestamp); | |
2695 | received_header->type = htype_old; | |
2696 | } | |
2697 | else | |
2698 | { | |
2699 | received_header->text = string_sprintf("%s; %s\n", received, timestamp); | |
2700 | received_header->type = htype_received; | |
2701 | } | |
2702 | ||
2703 | received_header->slen = Ustrlen(received_header->text); | |
2704 | ||
2705 | DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s", | |
2706 | received_header->type, received_header->text); | |
2707 | ||
2708 | /* Set the value of message_body_size for the DATA ACL and for local_scan() */ | |
2709 | ||
2710 | message_body_size = (fstat(data_fd, &statbuf) == 0)? | |
2711 | statbuf.st_size - SPOOL_DATA_START_OFFSET : -1; | |
2712 | ||
2713 | /* If an ACL from any RCPT commands set up any warning headers to add, do so | |
2714 | now, before running the DATA ACL. */ | |
2715 | ||
2716 | add_acl_headers(US"MAIL or RCPT"); | |
2717 | ||
2718 | /* If an ACL is specified for checking things at this stage of reception of a | |
2719 | message, run it, unless all the recipients were removed by "discard" in earlier | |
2720 | ACLs. That is the only case in which recipients_count can be zero at this | |
2721 | stage. Set deliver_datafile to point to the data file so that $message_body and | |
2722 | $message_body_end can be extracted if needed. Allow $recipients in expansions. | |
2723 | */ | |
2724 | ||
2725 | deliver_datafile = data_fd; | |
2726 | ||
2727 | if (recipients_count == 0) | |
2728 | { | |
2729 | blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL"; | |
2730 | } | |
2731 | else | |
2732 | { | |
2733 | enable_dollar_recipients = TRUE; | |
2734 | ||
2735 | /* Handle interactive SMTP messages */ | |
2736 | ||
2737 | if (smtp_input && !smtp_batched_input) | |
2738 | { | |
8523533c TK |
2739 | |
2740 | #ifdef WITH_CONTENT_SCAN | |
2741 | /* MIME ACL hook */ | |
2742 | if (acl_smtp_mime != NULL && recipients_count > 0) | |
2743 | { | |
2744 | FILE *mbox_file; | |
2745 | uschar rfc822_file_path[2048]; | |
f7b63901 | 2746 | unsigned long mbox_size; |
8523533c TK |
2747 | header_line *my_headerlist; |
2748 | uschar *user_msg, *log_msg; | |
2749 | int mime_part_count_buffer = -1; | |
2750 | ||
2751 | memset(CS rfc822_file_path,0,2048); | |
2752 | ||
2753 | /* check if it is a MIME message */ | |
2754 | my_headerlist = header_list; | |
2755 | while (my_headerlist != NULL) { | |
2756 | /* skip deleted headers */ | |
2757 | if (my_headerlist->type == '*') { | |
2758 | my_headerlist = my_headerlist->next; | |
2759 | continue; | |
2760 | }; | |
2761 | if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0) { | |
2762 | DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n"); | |
2763 | goto DO_MIME_ACL; | |
2764 | }; | |
2765 | my_headerlist = my_headerlist->next; | |
2766 | }; | |
2767 | ||
2768 | DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n"); | |
2769 | goto NO_MIME_ACL; | |
2770 | ||
2771 | DO_MIME_ACL: | |
2772 | /* make sure the eml mbox file is spooled up */ | |
2773 | mbox_file = spool_mbox(&mbox_size); | |
2774 | if (mbox_file == NULL) { | |
2775 | /* error while spooling */ | |
2776 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2777 | "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected."); | |
2778 | Uunlink(spool_name); | |
2779 | unspool_mbox(); | |
2780 | smtp_respond(451, TRUE, US"temporary local problem"); | |
2781 | message_id[0] = 0; /* Indicate no message accepted */ | |
2782 | smtp_reply = US""; /* Indicate reply already sent */ | |
2783 | goto TIDYUP; /* Skip to end of function */ | |
2784 | }; | |
2785 | ||
2786 | mime_is_rfc822 = 0; | |
2787 | ||
2788 | MIME_ACL_CHECK: | |
2789 | mime_part_count = -1; | |
2790 | rc = mime_acl_check(mbox_file, NULL, &user_msg, &log_msg); | |
2791 | fclose(mbox_file); | |
2792 | ||
2793 | if (Ustrlen(rfc822_file_path) > 0) { | |
2794 | mime_part_count = mime_part_count_buffer; | |
2795 | ||
2796 | if (unlink(CS rfc822_file_path) == -1) { | |
2797 | log_write(0, LOG_PANIC, | |
2798 | "acl_smtp_mime: can't unlink RFC822 spool file, skipping."); | |
2799 | goto END_MIME_ACL; | |
2800 | }; | |
2801 | }; | |
2802 | ||
2803 | /* check if we must check any message/rfc822 attachments */ | |
2804 | if (rc == OK) { | |
2805 | uschar temp_path[1024]; | |
2806 | int n; | |
2807 | struct dirent *entry; | |
2808 | DIR *tempdir; | |
2809 | ||
2810 | snprintf(CS temp_path, 1024, "%s/scan/%s", spool_directory, message_id); | |
2811 | ||
2812 | tempdir = opendir(CS temp_path); | |
2813 | n = 0; | |
2814 | do { | |
2815 | entry = readdir(tempdir); | |
2816 | if (entry == NULL) break; | |
2817 | if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0) { | |
2818 | snprintf(CS rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name); | |
2819 | debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path); | |
2820 | break; | |
2821 | }; | |
2822 | } while (1); | |
2823 | closedir(tempdir); | |
2824 | ||
2825 | if (entry != NULL) { | |
2826 | mbox_file = Ufopen(rfc822_file_path,"r"); | |
2827 | if (mbox_file == NULL) { | |
2828 | log_write(0, LOG_PANIC, | |
2829 | "acl_smtp_mime: can't open RFC822 spool file, skipping."); | |
2830 | unlink(CS rfc822_file_path); | |
2831 | goto END_MIME_ACL; | |
2832 | }; | |
2833 | /* set RFC822 expansion variable */ | |
2834 | mime_is_rfc822 = 1; | |
2835 | mime_part_count_buffer = mime_part_count; | |
2836 | goto MIME_ACL_CHECK; | |
2837 | }; | |
2838 | }; | |
2839 | ||
2840 | END_MIME_ACL: | |
2841 | add_acl_headers(US"MIME"); | |
2842 | if (rc == DISCARD) | |
2843 | { | |
2844 | recipients_count = 0; | |
2845 | blackholed_by = US"MIME ACL"; | |
2846 | } | |
2847 | else if (rc != OK) | |
2848 | { | |
2849 | Uunlink(spool_name); | |
2850 | unspool_mbox(); | |
2851 | if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0) | |
2852 | smtp_yield = FALSE; /* No more messsages after dropped connection */ | |
2853 | smtp_reply = US""; /* Indicate reply already sent */ | |
2854 | message_id[0] = 0; /* Indicate no message accepted */ | |
2855 | goto TIDYUP; /* Skip to end of function */ | |
2856 | }; | |
2857 | } | |
2858 | ||
2859 | NO_MIME_ACL: | |
2860 | #endif /* WITH_CONTENT_SCAN */ | |
2861 | ||
2862 | ||
059ec3d9 PH |
2863 | if (acl_smtp_data != NULL && recipients_count > 0) |
2864 | { | |
2865 | uschar *user_msg, *log_msg; | |
2866 | rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg); | |
2867 | add_acl_headers(US"DATA"); | |
2868 | if (rc == DISCARD) | |
2869 | { | |
2870 | recipients_count = 0; | |
2871 | blackholed_by = US"DATA ACL"; | |
2872 | } | |
2873 | else if (rc != OK) | |
2874 | { | |
2875 | Uunlink(spool_name); | |
8523533c TK |
2876 | #ifdef WITH_CONTENT_SCAN |
2877 | unspool_mbox(); | |
2878 | #endif | |
059ec3d9 PH |
2879 | if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0) |
2880 | smtp_yield = FALSE; /* No more messsages after dropped connection */ | |
2881 | smtp_reply = US""; /* Indicate reply already sent */ | |
2882 | message_id[0] = 0; /* Indicate no message accepted */ | |
2883 | goto TIDYUP; /* Skip to end of function */ | |
2884 | } | |
2885 | } | |
2886 | } | |
2887 | ||
2888 | /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that | |
2889 | we cannot take different actions for permanent and temporary rejections. */ | |
2890 | ||
2891 | else if (acl_not_smtp != NULL) | |
2892 | { | |
2893 | uschar *user_msg, *log_msg; | |
2894 | rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg); | |
2895 | if (rc == DISCARD) | |
2896 | { | |
2897 | recipients_count = 0; | |
2898 | blackholed_by = US"non-SMTP ACL"; | |
2899 | } | |
2900 | else if (rc != OK) | |
2901 | { | |
2902 | Uunlink(spool_name); | |
2903 | log_write(0, LOG_MAIN|LOG_REJECT, "F=<%s> rejected by non-SMTP ACL: %s", | |
2904 | sender_address, log_msg); | |
c5fcb476 | 2905 | if (user_msg == NULL) user_msg = US"local configuration problem"; |
059ec3d9 PH |
2906 | if (smtp_batched_input) |
2907 | { | |
2908 | moan_smtp_batch(NULL, "%d %s", 550, user_msg); | |
2909 | /* Does not return */ | |
2910 | } | |
2911 | else | |
2912 | { | |
2913 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
2914 | give_local_error(ERRMESS_LOCAL_ACL, user_msg, | |
2915 | US"message rejected by non-SMTP ACL: ", error_rc, data_file, | |
2916 | header_list); | |
2917 | /* Does not return */ | |
2918 | } | |
2919 | } | |
2920 | add_acl_headers(US"non-SMTP"); | |
2921 | } | |
2922 | ||
2923 | if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */ | |
2924 | if (queue_only_policy) queued_by = US"ACL"; | |
2925 | ||
2926 | enable_dollar_recipients = FALSE; | |
2927 | } | |
2928 | ||
8523533c TK |
2929 | #ifdef WITH_CONTENT_SCAN |
2930 | unspool_mbox(); | |
2931 | #endif | |
2932 | ||
059ec3d9 PH |
2933 | /* The final check on the message is to run the scan_local() function. The |
2934 | version supplied with Exim always accepts, but this is a hook for sysadmins to | |
2935 | supply their own checking code. The local_scan() function is run even when all | |
2936 | the recipients have been discarded. */ | |
2937 | ||
2938 | lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
2939 | ||
2940 | /* Arrange to catch crashes in local_scan(), so that the -D file gets | |
2941 | deleted, and the incident gets logged. */ | |
2942 | ||
2943 | os_non_restarting_signal(SIGSEGV, local_scan_crash_handler); | |
2944 | os_non_restarting_signal(SIGFPE, local_scan_crash_handler); | |
2945 | os_non_restarting_signal(SIGILL, local_scan_crash_handler); | |
2946 | os_non_restarting_signal(SIGBUS, local_scan_crash_handler); | |
2947 | ||
2948 | DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n", | |
2949 | local_scan_timeout); | |
2950 | local_scan_data = NULL; | |
2951 | ||
2952 | os_non_restarting_signal(SIGALRM, local_scan_timeout_handler); | |
2953 | if (local_scan_timeout > 0) alarm(local_scan_timeout); | |
2954 | rc = local_scan(data_fd, &local_scan_data); | |
2955 | alarm(0); | |
2956 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
2957 | ||
2958 | store_pool = POOL_MAIN; /* In case changed */ | |
2959 | DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc, | |
2960 | local_scan_data); | |
2961 | ||
2962 | os_non_restarting_signal(SIGSEGV, SIG_DFL); | |
2963 | os_non_restarting_signal(SIGFPE, SIG_DFL); | |
2964 | os_non_restarting_signal(SIGILL, SIG_DFL); | |
2965 | os_non_restarting_signal(SIGBUS, SIG_DFL); | |
2966 | ||
2967 | /* The length check is paranoia against some runaway code, and also because | |
2968 | (for a success return) lines in the spool file are read into big_buffer. */ | |
2969 | ||
2970 | if (local_scan_data != NULL) | |
2971 | { | |
2972 | int len = Ustrlen(local_scan_data); | |
2973 | if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN; | |
2974 | local_scan_data = string_copyn(local_scan_data, len); | |
2975 | } | |
2976 | ||
2977 | if (rc == LOCAL_SCAN_ACCEPT_FREEZE) | |
2978 | { | |
2979 | if (!deliver_freeze) /* ACL might have already frozen */ | |
2980 | { | |
2981 | deliver_freeze = TRUE; | |
2982 | deliver_frozen_at = time(NULL); | |
2983 | frozen_by = US"local_scan()"; | |
2984 | } | |
2985 | rc = LOCAL_SCAN_ACCEPT; | |
2986 | } | |
2987 | else if (rc == LOCAL_SCAN_ACCEPT_QUEUE) | |
2988 | { | |
2989 | if (!queue_only_policy) /* ACL might have already queued */ | |
2990 | { | |
2991 | queue_only_policy = TRUE; | |
2992 | queued_by = US"local_scan()"; | |
2993 | } | |
2994 | rc = LOCAL_SCAN_ACCEPT; | |
2995 | } | |
2996 | ||
2997 | /* Message accepted: remove newlines in local_scan_data because otherwise | |
2998 | the spool file gets corrupted. Ensure that all recipients are qualified. */ | |
2999 | ||
3000 | if (rc == LOCAL_SCAN_ACCEPT) | |
3001 | { | |
3002 | if (local_scan_data != NULL) | |
3003 | { | |
3004 | uschar *s; | |
3005 | for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' '; | |
3006 | } | |
3007 | for (i = 0; i < recipients_count; i++) | |
3008 | { | |
3009 | recipient_item *r = recipients_list + i; | |
3010 | r->address = rewrite_address_qualify(r->address, TRUE); | |
3011 | if (r->errors_to != NULL) | |
3012 | r->errors_to = rewrite_address_qualify(r->errors_to, TRUE); | |
3013 | } | |
3014 | if (recipients_count == 0 && blackholed_by == NULL) | |
3015 | blackholed_by = US"local_scan"; | |
3016 | } | |
3017 | ||
3018 | /* Message rejected: newlines permitted in local_scan_data to generate | |
3019 | multiline SMTP responses. */ | |
3020 | ||
3021 | else | |
3022 | { | |
3023 | uschar *istemp = US""; | |
3024 | uschar *s = NULL; | |
3025 | int size = 0; | |
3026 | int sptr = 0; | |
3027 | int code; | |
3028 | ||
3029 | errmsg = local_scan_data; | |
3030 | ||
3031 | Uunlink(spool_name); /* Cancel this message */ | |
3032 | switch(rc) | |
3033 | { | |
3034 | default: | |
3035 | log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary " | |
3036 | "rejection given", rc); | |
3037 | goto TEMPREJECT; | |
3038 | ||
3039 | case LOCAL_SCAN_REJECT_NOLOGHDR: | |
3040 | log_extra_selector &= ~LX_rejected_header; | |
3041 | /* Fall through */ | |
3042 | ||
3043 | case LOCAL_SCAN_REJECT: | |
3044 | code = 550; | |
3045 | if (errmsg == NULL) errmsg = US"Administrative prohibition"; | |
3046 | break; | |
3047 | ||
3048 | case LOCAL_SCAN_TEMPREJECT_NOLOGHDR: | |
3049 | log_extra_selector &= ~LX_rejected_header; | |
3050 | /* Fall through */ | |
3051 | ||
3052 | case LOCAL_SCAN_TEMPREJECT: | |
3053 | TEMPREJECT: | |
3054 | code = 451; | |
3055 | if (errmsg == NULL) errmsg = US"Temporary local problem"; | |
3056 | istemp = US"temporarily "; | |
3057 | break; | |
3058 | } | |
3059 | ||
3060 | s = string_append(s, &size, &sptr, 2, US"F=", | |
3061 | (sender_address[0] == 0)? US"<>" : sender_address); | |
3062 | s = add_host_info_for_log(s, &size, &sptr); | |
3063 | s[sptr] = 0; | |
3064 | ||
3065 | log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s", | |
3066 | s, istemp, string_printing(errmsg)); | |
3067 | ||
3068 | if (smtp_input) | |
3069 | { | |
3070 | if (!smtp_batched_input) | |
3071 | { | |
3072 | smtp_respond(code, TRUE, errmsg); | |
3073 | message_id[0] = 0; /* Indicate no message accepted */ | |
3074 | smtp_reply = US""; /* Indicate reply already sent */ | |
3075 | goto TIDYUP; /* Skip to end of function */ | |
3076 | } | |
3077 | else | |
3078 | { | |
3079 | moan_smtp_batch(NULL, "%d %s", code, errmsg); | |
3080 | /* Does not return */ | |
3081 | } | |
3082 | } | |
3083 | else | |
3084 | { | |
3085 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
3086 | give_local_error(ERRMESS_LOCAL_SCAN, errmsg, | |
3087 | US"message rejected by local scan code: ", error_rc, data_file, | |
3088 | header_list); | |
3089 | /* Does not return */ | |
3090 | } | |
3091 | } | |
3092 | ||
3093 | /* Reset signal handlers to ignore signals that previously would have caused | |
3094 | the message to be abandoned. */ | |
3095 | ||
3096 | signal(SIGTERM, SIG_IGN); | |
3097 | signal(SIGINT, SIG_IGN); | |
3098 | ||
3099 | /* Ensure the first time flag is set in the newly-received message. */ | |
3100 | ||
3101 | deliver_firsttime = TRUE; | |
3102 | ||
8523533c TK |
3103 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3104 | if (bmi_run == 1) { | |
3105 | /* rewind data file */ | |
3106 | lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
3107 | bmi_verdicts = bmi_process_message(header_list, data_fd); | |
3108 | }; | |
3109 | #endif | |
3110 | ||
059ec3d9 PH |
3111 | /* Update the timstamp in our Received: header to account for any time taken by |
3112 | an ACL or by local_scan(). The new time is the time that all reception | |
3113 | processing is complete. */ | |
3114 | ||
3115 | timestamp = expand_string(US"${tod_full}"); | |
3116 | tslen = Ustrlen(timestamp); | |
3117 | ||
3118 | memcpy(received_header->text + received_header->slen - tslen - 1, | |
3119 | timestamp, tslen); | |
3120 | ||
3121 | /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */ | |
3122 | ||
3123 | if (mua_wrapper) | |
3124 | { | |
3125 | deliver_freeze = FALSE; | |
3126 | queue_only_policy = FALSE; | |
3127 | } | |
3128 | ||
3129 | /* Keep the data file open until we have written the header file, in order to | |
3130 | hold onto the lock. In a -bh run, or if the message is to be blackholed, we | |
3131 | don't write the header file, and we unlink the data file. If writing the header | |
3132 | file fails, we have failed to accept this message. */ | |
3133 | ||
3134 | if (host_checking || blackholed_by != NULL) | |
3135 | { | |
3136 | header_line *h; | |
3137 | Uunlink(spool_name); | |
3138 | msg_size = 0; /* Compute size for log line */ | |
3139 | for (h = header_list; h != NULL; h = h->next) | |
3140 | if (h->type != '*') msg_size += h->slen; | |
3141 | } | |
3142 | ||
3143 | /* Write the -H file */ | |
3144 | ||
3145 | else | |
3146 | { | |
3147 | if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0) | |
3148 | { | |
3149 | log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg); | |
3150 | Uunlink(spool_name); /* Lose the data file */ | |
3151 | ||
3152 | if (smtp_input) | |
3153 | { | |
3154 | smtp_reply = US"451 Error in writing spool file"; | |
3155 | message_id[0] = 0; /* Indicate no message accepted */ | |
3156 | goto TIDYUP; | |
3157 | } | |
3158 | else | |
3159 | { | |
3160 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
3161 | give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file, | |
3162 | header_list); | |
3163 | /* Does not return */ | |
3164 | } | |
3165 | } | |
3166 | } | |
3167 | ||
3168 | ||
3169 | /* The message has now been successfully received. */ | |
3170 | ||
3171 | receive_messagecount++; | |
3172 | ||
3173 | /* In SMTP sessions we may receive several in one connection. After each one, | |
3174 | we wait for the clock to tick at the level of message-id granularity. This is | |
3175 | so that the combination of time+pid is unique, even on systems where the pid | |
3176 | can be re-used within our time interval. We can't shorten the interval without | |
3177 | re-designing the message-id. See comments above where the message id is | |
3178 | created. This is Something For The Future. */ | |
3179 | ||
3180 | message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution; | |
3181 | exim_wait_tick(&message_id_tv, id_resolution); | |
3182 | ||
3183 | /* Add data size to written header size. We do not count the initial file name | |
3184 | that is in the file, but we do add one extra for the notional blank line that | |
3185 | precedes the data. This total differs from message_size in that it include the | |
3186 | added Received: header and any other headers that got created locally. */ | |
3187 | ||
3188 | fflush(data_file); | |
3189 | fstat(data_fd, &statbuf); | |
3190 | ||
3191 | msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1; | |
3192 | ||
3193 | /* Generate a "message received" log entry. We do this by building up a dynamic | |
3194 | string as required. Since we commonly want to add two items at a time, use a | |
3195 | macro to simplify the coding. We log the arrival of a new message while the | |
3196 | file is still locked, just in case the machine is *really* fast, and delivers | |
3197 | it first! Include any message id that is in the message - since the syntax of a | |
3198 | message id is actually an addr-spec, we can use the parse routine to canonicize | |
3199 | it. */ | |
3200 | ||
3201 | size = 256; | |
3202 | sptr = 0; | |
3203 | s = store_get(size); | |
3204 | ||
3205 | s = string_append(s, &size, &sptr, 2, US"<= ", | |
3206 | (sender_address[0] == 0)? US"<>" : sender_address); | |
3207 | if (message_reference != NULL) | |
3208 | s = string_append(s, &size, &sptr, 2, US" R=", message_reference); | |
3209 | ||
3210 | s = add_host_info_for_log(s, &size, &sptr); | |
3211 | ||
3212 | #ifdef SUPPORT_TLS | |
3213 | if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL) | |
3214 | s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher); | |
3215 | if ((log_extra_selector & LX_tls_certificate_verified) != 0 && | |
3216 | tls_cipher != NULL) | |
3217 | s = string_append(s, &size, &sptr, 2, US" CV=", | |
3218 | tls_certificate_verified? "yes":"no"); | |
3219 | if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL) | |
3220 | s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\""); | |
3221 | #endif | |
3222 | ||
3223 | if (sender_host_authenticated != NULL) | |
3224 | { | |
3225 | s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated); | |
3226 | if (authenticated_id != NULL) | |
3227 | s = string_append(s, &size, &sptr, 2, US":", authenticated_id); | |
3228 | } | |
3229 | ||
3230 | sprintf(CS big_buffer, "%d", msg_size); | |
3231 | s = string_append(s, &size, &sptr, 2, US" S=", big_buffer); | |
3232 | ||
3233 | /* If an addr-spec in a message-id contains a quoted string, it can contain | |
3234 | any characters except " \ and CR and so in particular it can contain NL! | |
3235 | Therefore, make sure we use a printing-characters only version for the log. | |
3236 | Also, allow for domain literals in the message id. */ | |
3237 | ||
3238 | if (msgid_header != NULL) | |
3239 | { | |
3240 | uschar *old_id; | |
3241 | BOOL save_allow_domain_literals = allow_domain_literals; | |
3242 | allow_domain_literals = TRUE; | |
3243 | old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1, | |
3244 | &errmsg, &start, &end, &domain, FALSE); | |
3245 | allow_domain_literals = save_allow_domain_literals; | |
3246 | if (old_id != NULL) | |
3247 | s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id)); | |
3248 | } | |
3249 | ||
3250 | /* If subject logging is turned on, create suitable printing-character | |
3251 | text. By expanding $h_subject: we make use of the MIME decoding. */ | |
3252 | ||
3253 | if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL) | |
3254 | { | |
3255 | int i; | |
3256 | uschar *p = big_buffer; | |
3257 | uschar *ss = expand_string(US"$h_subject:"); | |
3258 | ||
3259 | /* Backslash-quote any double quotes or backslashes so as to make a | |
3260 | a C-like string, and turn any non-printers into escape sequences. */ | |
3261 | ||
3262 | *p++ = '\"'; | |
3263 | if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++) | |
3264 | { | |
3265 | if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\'; | |
3266 | *p++ = ss[i]; | |
3267 | } | |
3268 | *p++ = '\"'; | |
3269 | *p = 0; | |
3270 | s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer)); | |
3271 | } | |
3272 | ||
3273 | /* Terminate the string: string_cat() and string_append() leave room, but do | |
3274 | not put the zero in. */ | |
3275 | ||
3276 | s[sptr] = 0; | |
3277 | ||
3278 | /* While writing to the log, set a flag to cause a call to receive_bomb_out() | |
3279 | if the log cannot be opened. */ | |
3280 | ||
3281 | receive_call_bombout = TRUE; | |
3282 | log_write(0, LOG_MAIN | | |
3283 | (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) | | |
3284 | (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0), | |
3285 | "%s", s); | |
3286 | receive_call_bombout = FALSE; | |
3287 | ||
3288 | /* Log any control actions taken by an ACL or local_scan(). */ | |
3289 | ||
3290 | if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by); | |
3291 | if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN, | |
3292 | "no immediate delivery: queued by %s", queued_by); | |
3293 | ||
3294 | /* Create a message log file if message logs are being used and this message is | |
3295 | not blackholed. Write the reception stuff to it. We used to leave message log | |
3296 | creation until the first delivery, but this has proved confusing for somep | |
3297 | people. */ | |
3298 | ||
3299 | if (message_logs && blackholed_by == NULL) | |
3300 | { | |
3301 | int fd; | |
3302 | ||
3303 | sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir, | |
3304 | message_id); | |
3305 | fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE); | |
3306 | ||
3307 | if (fd < 0 && errno == ENOENT) | |
3308 | { | |
3309 | uschar temp[16]; | |
3310 | sprintf(CS temp, "msglog/%s", message_subdir); | |
3311 | if (message_subdir[0] == 0) temp[6] = 0; | |
3312 | (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE); | |
3313 | fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE); | |
3314 | } | |
3315 | ||
3316 | if (fd < 0) | |
3317 | { | |
3318 | log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s", | |
3319 | spool_name, strerror(errno)); | |
3320 | } | |
3321 | ||
3322 | else | |
3323 | { | |
3324 | FILE *message_log = fdopen(fd, "a"); | |
3325 | if (message_log == NULL) | |
3326 | { | |
3327 | log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s", | |
3328 | spool_name, strerror(errno)); | |
3329 | close(fd); | |
3330 | } | |
3331 | else | |
3332 | { | |
3333 | uschar *now = tod_stamp(tod_log); | |
3334 | fprintf(message_log, "%s Received from %s\n", now, s+3); | |
3335 | if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now, | |
3336 | frozen_by); | |
3337 | if (queue_only_policy) fprintf(message_log, | |
3338 | "%s no immediate delivery: queued by %s\n", now, queued_by); | |
3339 | fclose(message_log); | |
3340 | } | |
3341 | } | |
3342 | } | |
3343 | ||
3344 | store_reset(s); /* The store for the main log message can be reused */ | |
3345 | ||
3346 | /* If the message is frozen, and freeze_tell is set, do the telling. */ | |
3347 | ||
3348 | if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0) | |
3349 | { | |
3350 | moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival", | |
3351 | "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n", | |
3352 | message_id, frozen_by, sender_address); | |
3353 | } | |
3354 | ||
3355 | ||
3356 | /* Either a message has been successfully received and written to the two spool | |
3357 | files, or an error in writing the spool has occurred for an SMTP message, or | |
3358 | an SMTP message has been rejected because of a bad sender. (For a non-SMTP | |
3359 | message we will have already given up because there's no point in carrying on!) | |
3360 | In either event, we must now close (and thereby unlock) the data file. In the | |
3361 | successful case, this leaves the message on the spool, ready for delivery. In | |
3362 | the error case, the spool file will be deleted. Then tidy up store, interact | |
3363 | with an SMTP call if necessary, and return. | |
3364 | ||
3365 | A fflush() was done earlier in the expectation that any write errors on the | |
3366 | data file will be flushed(!) out thereby. Nevertheless, it is theoretically | |
3367 | possible for fclose() to fail - but what to do? What has happened to the lock | |
3368 | if this happens? */ | |
3369 | ||
3370 | TIDYUP: | |
3371 | process_info[process_info_len] = 0; /* Remove message id */ | |
3372 | if (data_file != NULL) fclose(data_file); /* Frees the lock */ | |
3373 | ||
3374 | /* Now reset signal handlers to their defaults */ | |
3375 | ||
3376 | signal(SIGTERM, SIG_DFL); | |
3377 | signal(SIGINT, SIG_DFL); | |
3378 | ||
3379 | /* Tell an SMTP caller the state of play, and arrange to return the SMTP return | |
3380 | value, which defaults TRUE - meaning there may be more incoming messages from | |
3381 | this connection. For non-SMTP callers (where there is only ever one message), | |
3382 | the default is FALSE. */ | |
3383 | ||
3384 | if (smtp_input) | |
3385 | { | |
3386 | yield = smtp_yield; | |
3387 | ||
3388 | /* Handle interactive SMTP callers. After several kinds of error, smtp_reply | |
3389 | is set to the response. However, after an ACL error or local_scan() error, | |
3390 | the response has already been sent, and smtp_reply is an empty string to | |
3391 | indicate this. */ | |
3392 | ||
3393 | if (!smtp_batched_input) | |
3394 | { | |
3395 | if (smtp_reply == NULL) | |
3396 | { | |
6951ac6c PH |
3397 | if (fake_reject) |
3398 | smtp_respond(550,TRUE,fake_reject_text); | |
3399 | else | |
3400 | smtp_printf("250 OK id=%s\r\n", message_id); | |
059ec3d9 PH |
3401 | if (host_checking) |
3402 | fprintf(stdout, | |
3403 | "\n**** SMTP testing: that is not a real message id!\n\n"); | |
3404 | } | |
8523533c TK |
3405 | else if (smtp_reply[0] != 0) |
3406 | { | |
6951ac6c PH |
3407 | if (fake_reject && (smtp_reply[0] == '2')) |
3408 | smtp_respond(550,TRUE,fake_reject_text); | |
3409 | else | |
3410 | smtp_printf("%.1024s\r\n", smtp_reply); | |
3411 | } | |
059ec3d9 PH |
3412 | } |
3413 | ||
3414 | /* For batched SMTP, generate an error message on failure, and do | |
3415 | nothing on success. The function moan_smtp_batch() does not return - | |
3416 | it exits from the program with a non-zero return code. */ | |
3417 | ||
3418 | else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply); | |
3419 | } | |
3420 | ||
3421 | ||
3422 | /* If blackholing, we can immediately log this message's sad fate. The data | |
3423 | file has already been unlinked, and the header file was never written to disk. | |
3424 | We must now indicate that nothing was received, to prevent a delivery from | |
3425 | starting. */ | |
3426 | ||
3427 | if (blackholed_by != NULL) | |
3428 | { | |
3429 | uschar *detail = (local_scan_data != NULL)? | |
3430 | string_printing(local_scan_data) : | |
3431 | string_sprintf("(%s discarded recipients)", blackholed_by); | |
3432 | log_write(0, LOG_MAIN, "=> blackhole %s", detail); | |
3433 | log_write(0, LOG_MAIN, "Completed"); | |
3434 | message_id[0] = 0; | |
3435 | } | |
3436 | ||
3437 | /* Reset headers so that logging of rejects for a subsequent message doesn't | |
3438 | include them. It is also important to set header_last = NULL before exiting | |
3439 | from this function, as this prevents certain rewrites that might happen during | |
3440 | subsequent verifying (of another incoming message) from trying to add headers | |
3441 | when they shouldn't. */ | |
3442 | ||
3443 | header_list = header_last = NULL; | |
3444 | ||
3445 | return yield; /* TRUE if more messages (SMTP only) */ | |
3446 | } | |
3447 | ||
3448 | /* End of receive.c */ |