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1f5497b2 | 1 | /* $Cambridge: exim/src/src/receive.c,v 1.39 2007/06/29 09:20:37 ph10 Exp $ */ |
059ec3d9 PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
184e8823 | 7 | /* Copyright (c) University of Cambridge 1995 - 2007 */ |
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 | ||
059ec3d9 PH |
12 | #include "exim.h" |
13 | ||
fb2274d4 TK |
14 | #ifdef EXPERIMENTAL_DOMAINKEYS |
15 | #define RECEIVE_GETC dk_receive_getc | |
16 | #define RECEIVE_UNGETC dk_receive_ungetc | |
17 | #else | |
18 | #define RECEIVE_GETC receive_getc | |
19 | #define RECEIVE_UNGETC receive_ungetc | |
20 | #endif | |
059ec3d9 PH |
21 | |
22 | /************************************************* | |
23 | * Local static variables * | |
24 | *************************************************/ | |
25 | ||
26 | static FILE *data_file = NULL; | |
27 | static int data_fd = -1; | |
28 | static uschar spool_name[256]; | |
29 | ||
30 | ||
31 | ||
32 | /************************************************* | |
33 | * Non-SMTP character reading functions * | |
34 | *************************************************/ | |
35 | ||
36 | /* These are the default functions that are set up in the variables such as | |
37 | receive_getc initially. They just call the standard functions, passing stdin as | |
38 | the file. (When SMTP input is occurring, different functions are used by | |
39 | changing the pointer variables.) */ | |
40 | ||
41 | int | |
42 | stdin_getc(void) | |
43 | { | |
44 | return getc(stdin); | |
45 | } | |
46 | ||
47 | int | |
48 | stdin_ungetc(int c) | |
49 | { | |
50 | return ungetc(c, stdin); | |
51 | } | |
52 | ||
53 | int | |
54 | stdin_feof(void) | |
55 | { | |
56 | return feof(stdin); | |
57 | } | |
58 | ||
59 | int | |
60 | stdin_ferror(void) | |
61 | { | |
62 | return ferror(stdin); | |
63 | } | |
64 | ||
65 | ||
66 | ||
67 | ||
68 | /************************************************* | |
69 | * Check that a set sender is allowed * | |
70 | *************************************************/ | |
71 | ||
72 | /* This function is called when a local caller sets an explicit sender address. | |
73 | It checks whether this is permitted, which it is for trusted callers. | |
74 | Otherwise, it must match the pattern(s) in untrusted_set_sender. | |
75 | ||
76 | Arguments: the proposed sender address | |
77 | Returns: TRUE for a trusted caller | |
78 | TRUE if the address has been set, untrusted_set_sender has been | |
79 | set, and the address matches something in the list | |
80 | FALSE otherwise | |
81 | */ | |
82 | ||
83 | BOOL | |
84 | receive_check_set_sender(uschar *newsender) | |
85 | { | |
86 | uschar *qnewsender; | |
87 | if (trusted_caller) return TRUE; | |
88 | if (newsender == NULL || untrusted_set_sender == NULL) return FALSE; | |
89 | qnewsender = (Ustrchr(newsender, '@') != NULL)? | |
90 | newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender); | |
91 | return | |
92 | match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1, | |
93 | 0, NULL) == OK; | |
94 | } | |
95 | ||
96 | ||
97 | ||
98 | ||
99 | /************************************************* | |
5cb8cbc6 | 100 | * Read space info for a partition * |
059ec3d9 PH |
101 | *************************************************/ |
102 | ||
8e669ac1 PH |
103 | /* This function is called by receive_check_fs() below, and also by string |
104 | expansion for variables such as $spool_space. The field names for the statvfs | |
5cb8cbc6 PH |
105 | structure are macros, because not all OS have F_FAVAIL and it seems tidier to |
106 | have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not | |
107 | have inodes, and they return -1 for the number available. | |
059ec3d9 | 108 | |
5cb8cbc6 PH |
109 | Later: It turns out that some file systems that do not have the concept of |
110 | inodes return 0 rather than -1. Such systems should also return 0 for the total | |
8e669ac1 | 111 | number of inodes, so we require that to be greater than zero before returning |
5cb8cbc6 | 112 | an inode count. |
059ec3d9 | 113 | |
5cb8cbc6 PH |
114 | Arguments: |
115 | isspool TRUE for spool partition, FALSE for log partition | |
116 | inodeptr address of int to receive inode count; -1 if there isn't one | |
8e669ac1 | 117 | |
5cb8cbc6 | 118 | Returns: available on-root space, in kilobytes |
8e669ac1 PH |
119 | -1 for log partition if there isn't one |
120 | ||
121 | All values are -1 if the STATFS functions are not available. | |
059ec3d9 PH |
122 | */ |
123 | ||
8e669ac1 | 124 | int |
5cb8cbc6 | 125 | receive_statvfs(BOOL isspool, int *inodeptr) |
059ec3d9 PH |
126 | { |
127 | #ifdef HAVE_STATFS | |
059ec3d9 | 128 | struct STATVFS statbuf; |
5cb8cbc6 PH |
129 | uschar *path; |
130 | uschar *name; | |
131 | uschar buffer[1024]; | |
059ec3d9 | 132 | |
5cb8cbc6 | 133 | /* The spool directory must always exist. */ |
059ec3d9 | 134 | |
5cb8cbc6 | 135 | if (isspool) |
059ec3d9 | 136 | { |
8e669ac1 PH |
137 | path = spool_directory; |
138 | name = US"spool"; | |
139 | } | |
140 | ||
059ec3d9 PH |
141 | /* Need to cut down the log file path to the directory, and to ignore any |
142 | appearance of "syslog" in it. */ | |
143 | ||
5cb8cbc6 | 144 | else |
059ec3d9 | 145 | { |
059ec3d9 | 146 | int sep = ':'; /* Not variable - outside scripts use */ |
059ec3d9 | 147 | uschar *p = log_file_path; |
8e669ac1 | 148 | name = US"log"; |
059ec3d9 PH |
149 | |
150 | /* An empty log_file_path means "use the default". This is the same as an | |
151 | empty item in a list. */ | |
152 | ||
153 | if (*p == 0) p = US":"; | |
154 | while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL) | |
155 | { | |
156 | if (Ustrcmp(path, "syslog") != 0) break; | |
157 | } | |
158 | ||
5cb8cbc6 PH |
159 | if (path == NULL) /* No log files */ |
160 | { | |
8e669ac1 PH |
161 | *inodeptr = -1; |
162 | return -1; | |
163 | } | |
059ec3d9 | 164 | |
8e669ac1 PH |
165 | /* An empty string means use the default, which is in the spool directory. |
166 | But don't just use the spool directory, as it is possible that the log | |
5cb8cbc6 | 167 | subdirectory has been symbolically linked elsewhere. */ |
059ec3d9 | 168 | |
8e669ac1 | 169 | if (path[0] == 0) |
059ec3d9 | 170 | { |
5cb8cbc6 PH |
171 | sprintf(CS buffer, CS"%s/log", CS spool_directory); |
172 | path = buffer; | |
8e669ac1 PH |
173 | } |
174 | else | |
059ec3d9 | 175 | { |
8e669ac1 | 176 | uschar *cp; |
5cb8cbc6 | 177 | if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0; |
8e669ac1 | 178 | } |
5cb8cbc6 | 179 | } |
8e669ac1 | 180 | |
5cb8cbc6 PH |
181 | /* We now have the patch; do the business */ |
182 | ||
183 | memset(&statbuf, 0, sizeof(statbuf)); | |
184 | ||
185 | if (STATVFS(CS path, &statbuf) != 0) | |
186 | { | |
187 | log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat " | |
188 | "%s directory %s: %s", name, spool_directory, strerror(errno)); | |
189 | smtp_closedown(US"spool or log directory problem"); | |
190 | exim_exit(EXIT_FAILURE); | |
191 | } | |
8e669ac1 | 192 | |
5cb8cbc6 PH |
193 | *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1; |
194 | ||
195 | /* Disks are getting huge. Take care with computing the size in kilobytes. */ | |
8e669ac1 | 196 | |
5cb8cbc6 PH |
197 | return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0); |
198 | ||
199 | /* Unable to find partition sizes in this environment. */ | |
200 | ||
201 | #else | |
202 | *inodeptr = -1; | |
203 | return -1; | |
204 | #endif | |
205 | } | |
206 | ||
059ec3d9 | 207 | |
059ec3d9 | 208 | |
5cb8cbc6 PH |
209 | |
210 | /************************************************* | |
211 | * Check space on spool and log partitions * | |
212 | *************************************************/ | |
213 | ||
214 | /* This function is called before accepting a message; if any thresholds are | |
215 | set, it checks them. If a message_size is supplied, it checks that there is | |
216 | enough space for that size plus the threshold - i.e. that the message won't | |
217 | reduce the space to the threshold. Not all OS have statvfs(); for those that | |
218 | don't, this function always returns TRUE. For some OS the old function and | |
219 | struct name statfs is used; that is handled by a macro, defined in exim.h. | |
220 | ||
221 | Arguments: | |
222 | msg_size the (estimated) size of an incoming message | |
223 | ||
224 | Returns: FALSE if there isn't enough space, or if the information cannot | |
225 | be obtained | |
226 | TRUE if no check was done or there is enough space | |
227 | */ | |
228 | ||
229 | BOOL | |
230 | receive_check_fs(int msg_size) | |
231 | { | |
232 | int space, inodes; | |
233 | ||
234 | if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0) | |
235 | { | |
8e669ac1 PH |
236 | space = receive_statvfs(TRUE, &inodes); |
237 | ||
059ec3d9 | 238 | DEBUG(D_receive) |
5cb8cbc6 PH |
239 | debug_printf("spool directory space = %dK inodes = %d " |
240 | "check_space = %dK inodes = %d msg_size = %d\n", | |
241 | space, inodes, check_spool_space, check_spool_inodes, msg_size); | |
8e669ac1 PH |
242 | |
243 | if ((space >= 0 && space < check_spool_space) || | |
5cb8cbc6 | 244 | (inodes >= 0 && inodes < check_spool_inodes)) |
8e669ac1 | 245 | { |
5cb8cbc6 PH |
246 | log_write(0, LOG_MAIN, "spool directory space check failed: space=%d " |
247 | "inodes=%d", space, inodes); | |
059ec3d9 PH |
248 | return FALSE; |
249 | } | |
250 | } | |
251 | ||
5cb8cbc6 PH |
252 | if (check_log_space > 0 || check_log_inodes > 0) |
253 | { | |
8e669ac1 PH |
254 | space = receive_statvfs(FALSE, &inodes); |
255 | ||
5cb8cbc6 PH |
256 | DEBUG(D_receive) |
257 | debug_printf("log directory space = %dK inodes = %d " | |
258 | "check_space = %dK inodes = %d\n", | |
259 | space, inodes, check_log_space, check_log_inodes); | |
8e669ac1 PH |
260 | |
261 | if ((space >= 0 && space < check_log_space) || | |
5cb8cbc6 | 262 | (inodes >= 0 && inodes < check_log_inodes)) |
8e669ac1 | 263 | { |
5cb8cbc6 PH |
264 | log_write(0, LOG_MAIN, "log directory space check failed: space=%d " |
265 | "inodes=%d", space, inodes); | |
266 | return FALSE; | |
267 | } | |
8e669ac1 PH |
268 | } |
269 | ||
059ec3d9 PH |
270 | return TRUE; |
271 | } | |
272 | ||
273 | ||
274 | ||
275 | /************************************************* | |
276 | * Bomb out while reading a message * | |
277 | *************************************************/ | |
278 | ||
279 | /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is | |
280 | received, or if there is a timeout. A rarer case might be if the log files are | |
281 | screwed up and Exim can't open them to record a message's arrival. Handling | |
282 | that case is done by setting a flag to cause the log functions to call this | |
283 | function if there is an ultimate disaster. That is why it is globally | |
284 | accessible. | |
285 | ||
286 | Arguments: SMTP response to give if in an SMTP session | |
287 | Returns: it doesn't | |
288 | */ | |
289 | ||
290 | void | |
291 | receive_bomb_out(uschar *msg) | |
292 | { | |
293 | /* If spool_name is set, it contains the name of the data file that is being | |
294 | written. Unlink it before closing so that it cannot be picked up by a delivery | |
295 | process. Ensure that any header file is also removed. */ | |
296 | ||
297 | if (spool_name[0] != 0) | |
298 | { | |
299 | Uunlink(spool_name); | |
300 | spool_name[Ustrlen(spool_name) - 1] = 'H'; | |
301 | Uunlink(spool_name); | |
302 | } | |
303 | ||
304 | /* Now close the file if it is open, either as a fd or a stream. */ | |
305 | ||
f1e894f3 PH |
306 | if (data_file != NULL) (void)fclose(data_file); |
307 | else if (data_fd >= 0) (void)close(data_fd); | |
059ec3d9 PH |
308 | |
309 | /* Attempt to close down an SMTP connection tidily. */ | |
310 | ||
311 | if (smtp_input) | |
312 | { | |
313 | if (!smtp_batched_input) | |
314 | { | |
315 | smtp_printf("421 %s %s - closing connection.\r\n", smtp_active_hostname, | |
316 | msg); | |
317 | mac_smtp_fflush(); | |
318 | } | |
319 | ||
320 | /* Control does not return from moan_smtp_batch(). */ | |
321 | ||
322 | else moan_smtp_batch(NULL, "421 %s - message abandoned", msg); | |
323 | } | |
324 | ||
325 | /* Exit from the program (non-BSMTP cases) */ | |
326 | ||
327 | exim_exit(EXIT_FAILURE); | |
328 | } | |
329 | ||
330 | ||
331 | /************************************************* | |
332 | * Data read timeout * | |
333 | *************************************************/ | |
334 | ||
335 | /* Handler function for timeouts that occur while reading the data that | |
336 | comprises a message. | |
337 | ||
338 | Argument: the signal number | |
339 | Returns: nothing | |
340 | */ | |
341 | ||
342 | static void | |
343 | data_timeout_handler(int sig) | |
344 | { | |
345 | uschar *msg = NULL; | |
346 | ||
347 | sig = sig; /* Keep picky compilers happy */ | |
348 | ||
349 | if (smtp_input) | |
350 | { | |
351 | msg = US"SMTP incoming data timeout"; | |
352 | log_write(L_lost_incoming_connection, | |
353 | LOG_MAIN, "SMTP data timeout (message abandoned) on connection " | |
fed77020 PH |
354 | "from %s F=<%s>", |
355 | (sender_fullhost != NULL)? sender_fullhost : US"local process", | |
356 | sender_address); | |
059ec3d9 PH |
357 | } |
358 | else | |
359 | { | |
360 | fprintf(stderr, "exim: timed out while reading - message abandoned\n"); | |
361 | log_write(L_lost_incoming_connection, | |
362 | LOG_MAIN, "timed out while reading local message"); | |
363 | } | |
364 | ||
365 | receive_bomb_out(msg); /* Does not return */ | |
366 | } | |
367 | ||
368 | ||
369 | ||
370 | /************************************************* | |
371 | * local_scan() timeout * | |
372 | *************************************************/ | |
373 | ||
374 | /* Handler function for timeouts that occur while running a local_scan() | |
375 | function. | |
376 | ||
377 | Argument: the signal number | |
378 | Returns: nothing | |
379 | */ | |
380 | ||
381 | static void | |
382 | local_scan_timeout_handler(int sig) | |
383 | { | |
384 | sig = sig; /* Keep picky compilers happy */ | |
385 | log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - " | |
386 | "message temporarily rejected (size %d)", message_size); | |
387 | receive_bomb_out(US"local verification problem"); /* Does not return */ | |
388 | } | |
389 | ||
390 | ||
391 | ||
392 | /************************************************* | |
393 | * local_scan() crashed * | |
394 | *************************************************/ | |
395 | ||
396 | /* Handler function for signals that occur while running a local_scan() | |
397 | function. | |
398 | ||
399 | Argument: the signal number | |
400 | Returns: nothing | |
401 | */ | |
402 | ||
403 | static void | |
404 | local_scan_crash_handler(int sig) | |
405 | { | |
406 | log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with " | |
407 | "signal %d - message temporarily rejected (size %d)", sig, message_size); | |
408 | receive_bomb_out(US"local verification problem"); /* Does not return */ | |
409 | } | |
410 | ||
411 | ||
412 | /************************************************* | |
413 | * SIGTERM or SIGINT received * | |
414 | *************************************************/ | |
415 | ||
416 | /* Handler for SIGTERM or SIGINT signals that occur while reading the | |
417 | data that comprises a message. | |
418 | ||
419 | Argument: the signal number | |
420 | Returns: nothing | |
421 | */ | |
422 | ||
423 | static void | |
424 | data_sigterm_sigint_handler(int sig) | |
425 | { | |
426 | uschar *msg = NULL; | |
427 | ||
428 | if (smtp_input) | |
429 | { | |
430 | msg = US"Service not available - SIGTERM or SIGINT received"; | |
431 | log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(), | |
432 | (sig == SIGTERM)? "SIGTERM" : "SIGINT"); | |
433 | } | |
434 | else | |
435 | { | |
f05da2e8 | 436 | if (filter_test == FTEST_NONE) |
059ec3d9 PH |
437 | { |
438 | fprintf(stderr, "\nexim: %s received - message abandoned\n", | |
439 | (sig == SIGTERM)? "SIGTERM" : "SIGINT"); | |
440 | log_write(0, LOG_MAIN, "%s received while reading local message", | |
441 | (sig == SIGTERM)? "SIGTERM" : "SIGINT"); | |
442 | } | |
443 | } | |
444 | ||
445 | receive_bomb_out(msg); /* Does not return */ | |
446 | } | |
447 | ||
448 | ||
449 | ||
450 | /************************************************* | |
451 | * Add new recipient to list * | |
452 | *************************************************/ | |
453 | ||
454 | /* This function builds a list of recipient addresses in argc/argv | |
455 | format. | |
456 | ||
457 | Arguments: | |
458 | recipient the next address to add to recipients_list | |
459 | pno parent number for fixed aliases; -1 otherwise | |
460 | ||
461 | Returns: nothing | |
462 | */ | |
463 | ||
464 | void | |
465 | receive_add_recipient(uschar *recipient, int pno) | |
466 | { | |
467 | if (recipients_count >= recipients_list_max) | |
468 | { | |
469 | recipient_item *oldlist = recipients_list; | |
470 | int oldmax = recipients_list_max; | |
471 | recipients_list_max = recipients_list_max? 2*recipients_list_max : 50; | |
472 | recipients_list = store_get(recipients_list_max * sizeof(recipient_item)); | |
473 | if (oldlist != NULL) | |
474 | memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item)); | |
475 | } | |
476 | ||
477 | recipients_list[recipients_count].address = recipient; | |
478 | recipients_list[recipients_count].pno = pno; | |
8523533c TK |
479 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
480 | recipients_list[recipients_count].bmi_optin = bmi_current_optin; | |
481 | /* reset optin string pointer for next recipient */ | |
482 | bmi_current_optin = NULL; | |
483 | #endif | |
059ec3d9 PH |
484 | recipients_list[recipients_count++].errors_to = NULL; |
485 | } | |
486 | ||
487 | ||
488 | ||
489 | ||
490 | /************************************************* | |
491 | * Remove a recipient from the list * | |
492 | *************************************************/ | |
493 | ||
494 | /* This function is provided for local_scan() to use. | |
495 | ||
496 | Argument: | |
497 | recipient address to remove | |
498 | ||
499 | Returns: TRUE if it did remove something; FALSE otherwise | |
500 | */ | |
501 | ||
502 | BOOL | |
503 | receive_remove_recipient(uschar *recipient) | |
504 | { | |
505 | int count; | |
506 | DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n", | |
507 | recipient); | |
508 | for (count = 0; count < recipients_count; count++) | |
509 | { | |
510 | if (Ustrcmp(recipients_list[count].address, recipient) == 0) | |
511 | { | |
512 | if ((--recipients_count - count) > 0) | |
513 | memmove(recipients_list + count, recipients_list + count + 1, | |
54cdb463 | 514 | (recipients_count - count)*sizeof(recipient_item)); |
059ec3d9 PH |
515 | return TRUE; |
516 | } | |
517 | } | |
518 | return FALSE; | |
519 | } | |
520 | ||
521 | ||
522 | ||
523 | ||
524 | ||
525 | /************************************************* | |
526 | * Read data portion of a non-SMTP message * | |
527 | *************************************************/ | |
528 | ||
529 | /* This function is called to read the remainder of a message (following the | |
530 | header) when the input is not from SMTP - we are receiving a local message on | |
531 | a standard input stream. The message is always terminated by EOF, and is also | |
532 | terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the | |
533 | two cases for maximum efficiency. | |
534 | ||
535 | Ensure that the body ends with a newline. This will naturally be the case when | |
536 | the termination is "\n.\n" but may not be otherwise. The RFC defines messages | |
537 | as "sequences of lines" - this of course strictly applies only to SMTP, but | |
538 | deliveries into BSD-type mailbox files also require it. Exim used to have a | |
539 | flag for doing this at delivery time, but as it was always set for all | |
540 | transports, I decided to simplify things by putting the check here instead. | |
541 | ||
542 | There is at least one MUA (dtmail) that sends CRLF via this interface, and | |
543 | other programs are known to do this as well. Exim used to have a option for | |
544 | dealing with this: in July 2003, after much discussion, the code has been | |
545 | changed to default to treat any of LF, CRLF, and bare CR as line terminators. | |
546 | ||
547 | However, for the case when a dot on a line by itself terminates a message, the | |
548 | only recognized terminating sequences before and after the dot are LF and CRLF. | |
549 | Otherwise, having read EOL . CR, you don't know whether to read another | |
550 | character or not. | |
551 | ||
552 | Internally, in messages stored in Exim's spool files, LF is used as the line | |
553 | terminator. Under the new regime, bare CRs will no longer appear in these | |
554 | files. | |
555 | ||
556 | Arguments: | |
557 | fout a FILE to which to write the message | |
558 | ||
559 | Returns: One of the END_xxx values indicating why it stopped reading | |
560 | */ | |
561 | ||
562 | static int | |
563 | read_message_data(FILE *fout) | |
564 | { | |
565 | int ch_state; | |
566 | register int ch; | |
d677b2f2 | 567 | register int linelength = 0; |
059ec3d9 PH |
568 | |
569 | /* Handle the case when only EOF terminates the message */ | |
570 | ||
571 | if (!dot_ends) | |
572 | { | |
573 | register int last_ch = '\n'; | |
574 | ||
fb2274d4 | 575 | for (; (ch = (RECEIVE_GETC)()) != EOF; last_ch = ch) |
059ec3d9 PH |
576 | { |
577 | if (ch == 0) body_zerocount++; | |
578 | if (last_ch == '\r' && ch != '\n') | |
579 | { | |
d677b2f2 PH |
580 | if (linelength > max_received_linelength) |
581 | max_received_linelength = linelength; | |
582 | linelength = 0; | |
059ec3d9 PH |
583 | if (fputc('\n', fout) == EOF) return END_WERROR; |
584 | message_size++; | |
585 | body_linecount++; | |
586 | } | |
587 | if (ch == '\r') continue; | |
588 | ||
589 | if (fputc(ch, fout) == EOF) return END_WERROR; | |
d677b2f2 PH |
590 | if (ch == '\n') |
591 | { | |
592 | if (linelength > max_received_linelength) | |
593 | max_received_linelength = linelength; | |
594 | linelength = 0; | |
595 | body_linecount++; | |
596 | } | |
597 | else linelength++; | |
059ec3d9 PH |
598 | if (++message_size > thismessage_size_limit) return END_SIZE; |
599 | } | |
600 | ||
601 | if (last_ch != '\n') | |
602 | { | |
d677b2f2 PH |
603 | if (linelength > max_received_linelength) |
604 | max_received_linelength = linelength; | |
059ec3d9 PH |
605 | if (fputc('\n', fout) == EOF) return END_WERROR; |
606 | message_size++; | |
607 | body_linecount++; | |
608 | } | |
609 | ||
610 | return END_EOF; | |
611 | } | |
612 | ||
613 | /* Handle the case when a dot on a line on its own, or EOF, terminates. */ | |
614 | ||
615 | ch_state = 1; | |
616 | ||
fb2274d4 | 617 | while ((ch = (RECEIVE_GETC)()) != EOF) |
059ec3d9 PH |
618 | { |
619 | if (ch == 0) body_zerocount++; | |
620 | switch (ch_state) | |
621 | { | |
622 | case 0: /* Normal state (previous char written) */ | |
623 | if (ch == '\n') | |
d677b2f2 PH |
624 | { |
625 | body_linecount++; | |
626 | if (linelength > max_received_linelength) | |
627 | max_received_linelength = linelength; | |
628 | linelength = -1; | |
629 | ch_state = 1; | |
630 | } | |
059ec3d9 PH |
631 | else if (ch == '\r') |
632 | { ch_state = 2; continue; } | |
633 | break; | |
634 | ||
635 | case 1: /* After written "\n" */ | |
636 | if (ch == '.') { ch_state = 3; continue; } | |
d677b2f2 | 637 | if (ch != '\n') ch_state = 0; else linelength = -1; |
059ec3d9 PH |
638 | break; |
639 | ||
640 | case 2: | |
641 | body_linecount++; /* After unwritten "\r" */ | |
d677b2f2 PH |
642 | if (linelength > max_received_linelength) |
643 | max_received_linelength = linelength; | |
059ec3d9 | 644 | if (ch == '\n') |
d677b2f2 PH |
645 | { |
646 | ch_state = 1; | |
647 | linelength = -1; | |
648 | } | |
059ec3d9 PH |
649 | else |
650 | { | |
651 | if (message_size++, fputc('\n', fout) == EOF) return END_WERROR; | |
652 | if (ch == '\r') continue; | |
653 | ch_state = 0; | |
d677b2f2 | 654 | linelength = 0; |
059ec3d9 PH |
655 | } |
656 | break; | |
657 | ||
658 | case 3: /* After "\n." (\n written, dot not) */ | |
659 | if (ch == '\n') return END_DOT; | |
660 | if (ch == '\r') { ch_state = 4; continue; } | |
661 | message_size++; | |
d677b2f2 | 662 | linelength++; |
059ec3d9 PH |
663 | if (fputc('.', fout) == EOF) return END_WERROR; |
664 | ch_state = 0; | |
665 | break; | |
666 | ||
667 | case 4: /* After "\n.\r" (\n written, rest not) */ | |
668 | if (ch == '\n') return END_DOT; | |
669 | message_size += 2; | |
670 | body_linecount++; | |
671 | if (fputs(".\n", fout) == EOF) return END_WERROR; | |
672 | if (ch == '\r') { ch_state = 2; continue; } | |
673 | ch_state = 0; | |
674 | break; | |
675 | } | |
676 | ||
d677b2f2 | 677 | linelength++; |
059ec3d9 PH |
678 | if (fputc(ch, fout) == EOF) return END_WERROR; |
679 | if (++message_size > thismessage_size_limit) return END_SIZE; | |
680 | } | |
681 | ||
682 | /* Get here if EOF read. Unless we have just written "\n", we need to ensure | |
683 | the message ends with a newline, and we must also write any characters that | |
684 | were saved up while testing for an ending dot. */ | |
685 | ||
686 | if (ch_state != 1) | |
687 | { | |
688 | static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" }; | |
689 | if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR; | |
690 | message_size += Ustrlen(ends[ch_state]); | |
691 | body_linecount++; | |
692 | } | |
693 | ||
694 | return END_EOF; | |
695 | } | |
696 | ||
697 | ||
698 | ||
699 | ||
700 | /************************************************* | |
701 | * Read data portion of an SMTP message * | |
702 | *************************************************/ | |
703 | ||
704 | /* This function is called to read the remainder of an SMTP message (after the | |
705 | headers), or to skip over it when an error has occurred. In this case, the | |
706 | output file is passed as NULL. | |
707 | ||
708 | If any line begins with a dot, that character is skipped. The input should only | |
709 | be successfully terminated by CR LF . CR LF unless it is local (non-network) | |
710 | SMTP, in which case the CRs are optional, but... | |
711 | ||
712 | FUDGE: It seems that sites on the net send out messages with just LF | |
713 | terminators, despite the warnings in the RFCs, and other MTAs handle this. So | |
714 | we make the CRs optional in all cases. | |
715 | ||
716 | July 2003: Bare CRs cause trouble. We now treat them as line terminators as | |
717 | well, so that there are no CRs in spooled messages. However, the message | |
718 | terminating dot is not recognized between two bare CRs. | |
719 | ||
720 | Arguments: | |
721 | fout a FILE to which to write the message; NULL if skipping | |
722 | ||
723 | Returns: One of the END_xxx values indicating why it stopped reading | |
724 | */ | |
725 | ||
726 | static int | |
727 | read_message_data_smtp(FILE *fout) | |
728 | { | |
729 | int ch_state = 0; | |
730 | register int ch; | |
1f5497b2 | 731 | register int linelength = 0; |
059ec3d9 | 732 | |
fb2274d4 | 733 | while ((ch = (RECEIVE_GETC)()) != EOF) |
059ec3d9 PH |
734 | { |
735 | if (ch == 0) body_zerocount++; | |
736 | switch (ch_state) | |
737 | { | |
738 | case 0: /* After LF or CRLF */ | |
739 | if (ch == '.') | |
740 | { | |
741 | ch_state = 3; | |
742 | continue; /* Don't ever write . after LF */ | |
743 | } | |
744 | ch_state = 1; | |
745 | ||
746 | /* Else fall through to handle as normal uschar. */ | |
747 | ||
748 | case 1: /* Normal state */ | |
749 | if (ch == '\n') | |
750 | { | |
751 | ch_state = 0; | |
752 | body_linecount++; | |
1f5497b2 PH |
753 | if (linelength > max_received_linelength) |
754 | max_received_linelength = linelength; | |
755 | linelength = -1; | |
059ec3d9 PH |
756 | } |
757 | else if (ch == '\r') | |
758 | { | |
759 | ch_state = 2; | |
760 | continue; | |
761 | } | |
762 | break; | |
763 | ||
764 | case 2: /* After (unwritten) CR */ | |
765 | body_linecount++; | |
1f5497b2 PH |
766 | if (linelength > max_received_linelength) |
767 | max_received_linelength = linelength; | |
768 | linelength = -1; | |
059ec3d9 PH |
769 | if (ch == '\n') |
770 | { | |
771 | ch_state = 0; | |
772 | } | |
773 | else | |
774 | { | |
775 | message_size++; | |
776 | if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR; | |
777 | if (ch != '\r') ch_state = 1; else continue; | |
778 | } | |
779 | break; | |
780 | ||
781 | case 3: /* After [CR] LF . */ | |
782 | if (ch == '\n') | |
783 | return END_DOT; | |
784 | if (ch == '\r') | |
785 | { | |
786 | ch_state = 4; | |
787 | continue; | |
788 | } | |
789 | ch_state = 1; /* The dot itself is removed */ | |
790 | break; | |
791 | ||
792 | case 4: /* After [CR] LF . CR */ | |
793 | if (ch == '\n') return END_DOT; | |
794 | message_size++; | |
795 | body_linecount++; | |
796 | if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR; | |
797 | if (ch == '\r') | |
798 | { | |
799 | ch_state = 2; | |
800 | continue; | |
801 | } | |
802 | ch_state = 1; | |
803 | break; | |
804 | } | |
805 | ||
806 | /* Add the character to the spool file, unless skipping; then loop for the | |
807 | next. */ | |
808 | ||
809 | message_size++; | |
1f5497b2 | 810 | linelength++; |
059ec3d9 PH |
811 | if (fout != NULL) |
812 | { | |
813 | if (fputc(ch, fout) == EOF) return END_WERROR; | |
814 | if (message_size > thismessage_size_limit) return END_SIZE; | |
815 | } | |
816 | } | |
817 | ||
818 | /* Fall through here if EOF encountered. This indicates some kind of error, | |
819 | since a correct message is terminated by [CR] LF . [CR] LF. */ | |
820 | ||
821 | return END_EOF; | |
822 | } | |
823 | ||
824 | ||
825 | ||
826 | ||
827 | /************************************************* | |
828 | * Swallow SMTP message * | |
829 | *************************************************/ | |
830 | ||
831 | /* This function is called when there has been some kind of error while reading | |
832 | an SMTP message, and the remaining data may need to be swallowed. It is global | |
833 | because it is called from smtp_closedown() to shut down an incoming call | |
834 | tidily. | |
835 | ||
836 | Argument: a FILE from which to read the message | |
837 | Returns: nothing | |
838 | */ | |
839 | ||
840 | void | |
841 | receive_swallow_smtp(void) | |
842 | { | |
843 | if (message_ended >= END_NOTENDED) | |
844 | message_ended = read_message_data_smtp(NULL); | |
845 | } | |
846 | ||
847 | ||
848 | ||
849 | /************************************************* | |
850 | * Handle lost SMTP connection * | |
851 | *************************************************/ | |
852 | ||
853 | /* This function logs connection loss incidents and generates an appropriate | |
854 | SMTP response. | |
855 | ||
856 | Argument: additional data for the message | |
857 | Returns: the SMTP response | |
858 | */ | |
859 | ||
860 | static uschar * | |
861 | handle_lost_connection(uschar *s) | |
862 | { | |
863 | log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN, | |
864 | "%s lost while reading message data%s", smtp_get_connection_info(), s); | |
865 | return US"421 Lost incoming connection"; | |
866 | } | |
867 | ||
868 | ||
869 | ||
870 | ||
871 | /************************************************* | |
872 | * Handle a non-smtp reception error * | |
873 | *************************************************/ | |
874 | ||
875 | /* This function is called for various errors during the reception of non-SMTP | |
876 | messages. It either sends a message to the sender of the problem message, or it | |
877 | writes to the standard error stream. | |
878 | ||
879 | Arguments: | |
880 | errcode code for moan_to_sender(), identifying the error | |
881 | text1 first message text, passed to moan_to_sender() | |
882 | text2 second message text, used only for stderrr | |
883 | error_rc code to pass to exim_exit if no problem | |
884 | f FILE containing body of message (may be stdin) | |
885 | hptr pointer to instore headers or NULL | |
886 | ||
887 | Returns: calls exim_exit(), which does not return | |
888 | */ | |
889 | ||
890 | static void | |
891 | give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc, | |
892 | FILE *f, header_line *hptr) | |
893 | { | |
894 | if (error_handling == ERRORS_SENDER) | |
895 | { | |
896 | error_block eblock; | |
897 | eblock.next = NULL; | |
898 | eblock.text1 = text1; | |
899 | if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE)) | |
900 | error_rc = EXIT_FAILURE; | |
901 | } | |
902 | else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */ | |
f1e894f3 | 903 | (void)fclose(f); |
059ec3d9 PH |
904 | exim_exit(error_rc); |
905 | } | |
906 | ||
907 | ||
908 | ||
909 | /************************************************* | |
910 | * Add header lines set up by ACL * | |
911 | *************************************************/ | |
912 | ||
850635b6 PH |
913 | /* This function is called to add the header lines that were set up by |
914 | statements in an ACL to the list of headers in memory. It is done in two stages | |
915 | like this, because when the ACL for RCPT is running, the other headers have not | |
916 | yet been received. This function is called twice; once just before running the | |
917 | DATA ACL, and once after. This is so that header lines added by MAIL or RCPT | |
918 | are visible to the DATA ACL. | |
059ec3d9 PH |
919 | |
920 | Originally these header lines were added at the end. Now there is support for | |
921 | three different places: top, bottom, and after the Received: header(s). There | |
922 | will always be at least one Received: header, even if it is marked deleted, and | |
923 | even if something else has been put in front of it. | |
924 | ||
925 | Arguments: | |
926 | acl_name text to identify which ACL | |
927 | ||
928 | Returns: nothing | |
929 | */ | |
930 | ||
931 | static void | |
932 | add_acl_headers(uschar *acl_name) | |
933 | { | |
934 | header_line *h, *next; | |
935 | header_line *last_received = NULL; | |
936 | ||
71fafd95 | 937 | if (acl_added_headers == NULL) return; |
059ec3d9 PH |
938 | DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name); |
939 | ||
71fafd95 | 940 | for (h = acl_added_headers; h != NULL; h = next) |
059ec3d9 PH |
941 | { |
942 | next = h->next; | |
943 | ||
944 | switch(h->type) | |
945 | { | |
946 | case htype_add_top: | |
947 | h->next = header_list; | |
948 | header_list = h; | |
949 | DEBUG(D_receive|D_acl) debug_printf(" (at top)"); | |
950 | break; | |
951 | ||
952 | case htype_add_rec: | |
953 | if (last_received == NULL) | |
954 | { | |
955 | last_received = header_list; | |
956 | while (!header_testname(last_received, US"Received", 8, FALSE)) | |
957 | last_received = last_received->next; | |
958 | while (last_received->next != NULL && | |
959 | header_testname(last_received->next, US"Received", 8, FALSE)) | |
960 | last_received = last_received->next; | |
961 | } | |
962 | h->next = last_received->next; | |
963 | last_received->next = h; | |
964 | DEBUG(D_receive|D_acl) debug_printf(" (after Received:)"); | |
965 | break; | |
966 | ||
8523533c TK |
967 | case htype_add_rfc: |
968 | /* add header before any header which is NOT Received: or Resent- */ | |
969 | last_received = header_list; | |
970 | while ( (last_received->next != NULL) && | |
971 | ( (header_testname(last_received->next, US"Received", 8, FALSE)) || | |
972 | (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) ) | |
973 | last_received = last_received->next; | |
974 | /* last_received now points to the last Received: or Resent-* header | |
975 | in an uninterrupted chain of those header types (seen from the beginning | |
976 | of all headers. Our current header must follow it. */ | |
977 | h->next = last_received->next; | |
978 | last_received->next = h; | |
8e669ac1 | 979 | DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)"); |
8523533c TK |
980 | break; |
981 | ||
059ec3d9 PH |
982 | default: |
983 | h->next = NULL; | |
984 | header_last->next = h; | |
985 | break; | |
986 | } | |
987 | ||
988 | if (h->next == NULL) header_last = h; | |
989 | ||
990 | /* Check for one of the known header types (From:, To:, etc.) though in | |
991 | practice most added headers are going to be "other". Lower case | |
992 | identification letters are never stored with the header; they are used | |
993 | for existence tests when messages are received. So discard any lower case | |
994 | flag values. */ | |
995 | ||
996 | h->type = header_checkname(h, FALSE); | |
997 | if (h->type >= 'a') h->type = htype_other; | |
998 | ||
999 | DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text); | |
1000 | } | |
1001 | ||
71fafd95 | 1002 | acl_added_headers = NULL; |
059ec3d9 PH |
1003 | DEBUG(D_receive|D_acl) debug_printf(">>\n"); |
1004 | } | |
1005 | ||
1006 | ||
1007 | ||
1008 | /************************************************* | |
1009 | * Add host information for log line * | |
1010 | *************************************************/ | |
1011 | ||
1012 | /* Called for acceptance and rejecting log lines. This adds information about | |
1013 | the calling host to a string that is being built dynamically. | |
1014 | ||
1015 | Arguments: | |
1016 | s the dynamic string | |
1017 | sizeptr points to the size variable | |
1018 | ptrptr points to the pointer variable | |
1019 | ||
1020 | Returns: the extended string | |
1021 | */ | |
1022 | ||
1023 | static uschar * | |
1024 | add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr) | |
1025 | { | |
1026 | if (sender_fullhost != NULL) | |
1027 | { | |
1028 | s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost); | |
1029 | if ((log_extra_selector & LX_incoming_interface) != 0 && | |
1030 | interface_address != NULL) | |
1031 | { | |
1032 | uschar *ss = string_sprintf(" I=[%s]:%d", interface_address, | |
1033 | interface_port); | |
1034 | s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss)); | |
1035 | } | |
1036 | } | |
1037 | if (sender_ident != NULL) | |
1038 | s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident); | |
1039 | if (received_protocol != NULL) | |
1040 | s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol); | |
1041 | return s; | |
1042 | } | |
1043 | ||
1044 | ||
1045 | ||
63955bf2 | 1046 | #ifdef WITH_CONTENT_SCAN |
059ec3d9 | 1047 | |
54cdb463 PH |
1048 | /************************************************* |
1049 | * Run the MIME ACL on a message * | |
1050 | *************************************************/ | |
1051 | ||
1052 | /* This code is in a subroutine so that it can be used for both SMTP | |
1053 | and non-SMTP messages. It is called with a non-NULL ACL pointer. | |
1054 | ||
1055 | Arguments: | |
1056 | acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime) | |
1057 | smtp_yield_ptr Set FALSE to kill messages after dropped connection | |
1058 | smtp_reply_ptr Where SMTP reply is being built | |
1059 | blackholed_by_ptr Where "blackholed by" message is being built | |
1060 | ||
1061 | Returns: TRUE to carry on; FALSE to abandon the message | |
1062 | */ | |
1063 | ||
1064 | static BOOL | |
1065 | run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr, | |
1066 | uschar **blackholed_by_ptr) | |
1067 | { | |
1068 | FILE *mbox_file; | |
1069 | uschar rfc822_file_path[2048]; | |
1070 | unsigned long mbox_size; | |
1071 | header_line *my_headerlist; | |
1072 | uschar *user_msg, *log_msg; | |
1073 | int mime_part_count_buffer = -1; | |
1074 | int rc; | |
1075 | ||
1076 | memset(CS rfc822_file_path,0,2048); | |
1077 | ||
1078 | /* check if it is a MIME message */ | |
1079 | my_headerlist = header_list; | |
4e88a19f PH |
1080 | while (my_headerlist != NULL) |
1081 | { | |
54cdb463 | 1082 | /* skip deleted headers */ |
4e88a19f PH |
1083 | if (my_headerlist->type == '*') |
1084 | { | |
54cdb463 PH |
1085 | my_headerlist = my_headerlist->next; |
1086 | continue; | |
4e88a19f PH |
1087 | } |
1088 | if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0) | |
1089 | { | |
54cdb463 PH |
1090 | DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n"); |
1091 | goto DO_MIME_ACL; | |
4e88a19f | 1092 | } |
54cdb463 | 1093 | my_headerlist = my_headerlist->next; |
4e88a19f | 1094 | } |
54cdb463 PH |
1095 | |
1096 | DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n"); | |
1097 | return TRUE; | |
1098 | ||
1099 | DO_MIME_ACL: | |
1100 | /* make sure the eml mbox file is spooled up */ | |
1101 | mbox_file = spool_mbox(&mbox_size); | |
1102 | if (mbox_file == NULL) { | |
1103 | /* error while spooling */ | |
1104 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1105 | "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected."); | |
1106 | Uunlink(spool_name); | |
1107 | unspool_mbox(); | |
a5bd321b | 1108 | smtp_respond(US"451", 3, TRUE, US"temporary local problem"); |
54cdb463 PH |
1109 | message_id[0] = 0; /* Indicate no message accepted */ |
1110 | *smtp_reply_ptr = US""; /* Indicate reply already sent */ | |
1111 | return FALSE; /* Indicate skip to end of receive function */ | |
1112 | }; | |
1113 | ||
1114 | mime_is_rfc822 = 0; | |
1115 | ||
1116 | MIME_ACL_CHECK: | |
1117 | mime_part_count = -1; | |
1118 | rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg); | |
f1e894f3 | 1119 | (void)fclose(mbox_file); |
54cdb463 | 1120 | |
4e88a19f PH |
1121 | if (Ustrlen(rfc822_file_path) > 0) |
1122 | { | |
54cdb463 PH |
1123 | mime_part_count = mime_part_count_buffer; |
1124 | ||
4e88a19f PH |
1125 | if (unlink(CS rfc822_file_path) == -1) |
1126 | { | |
54cdb463 PH |
1127 | log_write(0, LOG_PANIC, |
1128 | "acl_smtp_mime: can't unlink RFC822 spool file, skipping."); | |
1129 | goto END_MIME_ACL; | |
4e88a19f PH |
1130 | } |
1131 | } | |
54cdb463 PH |
1132 | |
1133 | /* check if we must check any message/rfc822 attachments */ | |
4e88a19f PH |
1134 | if (rc == OK) |
1135 | { | |
54cdb463 PH |
1136 | uschar temp_path[1024]; |
1137 | int n; | |
1138 | struct dirent *entry; | |
1139 | DIR *tempdir; | |
1140 | ||
b07e6aa3 PH |
1141 | (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory, |
1142 | message_id); | |
54cdb463 | 1143 | |
4e88a19f PH |
1144 | tempdir = opendir(CS temp_path); |
1145 | n = 0; | |
1146 | do | |
1147 | { | |
1148 | entry = readdir(tempdir); | |
1149 | if (entry == NULL) break; | |
1150 | if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0) | |
1151 | { | |
b07e6aa3 | 1152 | (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name); |
4e88a19f PH |
1153 | debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path); |
1154 | break; | |
1155 | } | |
1156 | } while (1); | |
1157 | closedir(tempdir); | |
54cdb463 | 1158 | |
4e88a19f PH |
1159 | if (entry != NULL) |
1160 | { | |
c58b88df | 1161 | mbox_file = Ufopen(rfc822_file_path,"rb"); |
4e88a19f PH |
1162 | if (mbox_file == NULL) |
1163 | { | |
54cdb463 PH |
1164 | log_write(0, LOG_PANIC, |
1165 | "acl_smtp_mime: can't open RFC822 spool file, skipping."); | |
1166 | unlink(CS rfc822_file_path); | |
1167 | goto END_MIME_ACL; | |
4e88a19f | 1168 | } |
54cdb463 PH |
1169 | /* set RFC822 expansion variable */ |
1170 | mime_is_rfc822 = 1; | |
1171 | mime_part_count_buffer = mime_part_count; | |
1172 | goto MIME_ACL_CHECK; | |
4e88a19f PH |
1173 | } |
1174 | } | |
54cdb463 PH |
1175 | |
1176 | END_MIME_ACL: | |
1177 | add_acl_headers(US"MIME"); | |
1178 | if (rc == DISCARD) | |
1179 | { | |
1180 | recipients_count = 0; | |
1181 | *blackholed_by_ptr = US"MIME ACL"; | |
1182 | } | |
1183 | else if (rc != OK) | |
1184 | { | |
1185 | Uunlink(spool_name); | |
1186 | unspool_mbox(); | |
1187 | if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0) | |
1188 | *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */ | |
1189 | *smtp_reply_ptr = US""; /* Indicate reply already sent */ | |
1190 | message_id[0] = 0; /* Indicate no message accepted */ | |
1191 | return FALSE; /* Cause skip to end of receive function */ | |
4e88a19f | 1192 | } |
54cdb463 PH |
1193 | |
1194 | return TRUE; | |
1195 | } | |
1196 | ||
63955bf2 | 1197 | #endif /* WITH_CONTENT_SCAN */ |
54cdb463 PH |
1198 | |
1199 | ||
059ec3d9 PH |
1200 | /************************************************* |
1201 | * Receive message * | |
1202 | *************************************************/ | |
1203 | ||
1204 | /* Receive a message on the given input, and put it into a pair of spool files. | |
1205 | Either a non-null list of recipients, or the extract flag will be true, or | |
1206 | both. The flag sender_local is true for locally generated messages. The flag | |
1207 | submission_mode is true if an ACL has obeyed "control = submission". The flag | |
8800895a PH |
1208 | suppress_local_fixups is true if an ACL has obeyed "control = |
1209 | suppress_local_fixups". The flag smtp_input is true if the message is to be | |
1210 | handled using SMTP conventions about termination and lines starting with dots. | |
1211 | For non-SMTP messages, dot_ends is true for dot-terminated messages. | |
059ec3d9 PH |
1212 | |
1213 | If a message was successfully read, message_id[0] will be non-zero. | |
1214 | ||
1215 | The general actions of this function are: | |
1216 | ||
1217 | . Read the headers of the message (if any) into a chain of store | |
1218 | blocks. | |
1219 | ||
1220 | . If there is a "sender:" header and the message is locally originated, | |
69358f02 PH |
1221 | throw it away, unless the caller is trusted, or unless |
1222 | active_local_sender_retain is set - which can only happen if | |
1223 | active_local_from_check is false. | |
059ec3d9 PH |
1224 | |
1225 | . If recipients are to be extracted from the message, build the | |
1226 | recipients list from the headers, removing any that were on the | |
1227 | original recipients list (unless extract_addresses_remove_arguments is | |
1228 | false), and at the same time, remove any bcc header that may be present. | |
1229 | ||
1230 | . Get the spool file for the data, sort out its unique name, open | |
1231 | and lock it (but don't give it the name yet). | |
1232 | ||
1233 | . Generate a "Message-Id" header if the message doesn't have one, for | |
1234 | locally-originated messages. | |
1235 | ||
1236 | . Generate a "Received" header. | |
1237 | ||
1238 | . Ensure the recipients list is fully qualified and rewritten if necessary. | |
1239 | ||
1240 | . If there are any rewriting rules, apply them to the sender address | |
1241 | and also to the headers. | |
1242 | ||
1243 | . If there is no from: header, generate one, for locally-generated messages | |
1244 | and messages in "submission mode" only. | |
1245 | ||
1246 | . If the sender is local, check that from: is correct, and if not, generate | |
1247 | a Sender: header, unless message comes from a trusted caller, or this | |
69358f02 | 1248 | feature is disabled by active_local_from_check being false. |
059ec3d9 PH |
1249 | |
1250 | . If there is no "date" header, generate one, for locally-originated | |
1251 | or submission mode messages only. | |
1252 | ||
1253 | . Copy the rest of the input, or up to a terminating "." if in SMTP or | |
1254 | dot_ends mode, to the data file. Leave it open, to hold the lock. | |
1255 | ||
1256 | . Write the envelope and the headers to a new file. | |
1257 | ||
1258 | . Set the name for the header file; close it. | |
1259 | ||
1260 | . Set the name for the data file; close it. | |
1261 | ||
1262 | Because this function can potentially be called many times in a single | |
1263 | SMTP connection, all store should be got by store_get(), so that it will be | |
1264 | automatically retrieved after the message is accepted. | |
1265 | ||
1266 | FUDGE: It seems that sites on the net send out messages with just LF | |
1267 | terminators, despite the warnings in the RFCs, and other MTAs handle this. So | |
1268 | we make the CRs optional in all cases. | |
1269 | ||
1270 | July 2003: Bare CRs in messages, especially in header lines, cause trouble. A | |
1271 | new regime is now in place in which bare CRs in header lines are turned into LF | |
1272 | followed by a space, so as not to terminate the header line. | |
1273 | ||
1274 | February 2004: A bare LF in a header line in a message whose first line was | |
1275 | terminated by CRLF is treated in the same way as a bare CR. | |
1276 | ||
1277 | Arguments: | |
1278 | extract_recip TRUE if recipients are to be extracted from the message's | |
1279 | headers | |
1280 | ||
1281 | Returns: TRUE there are more messages to be read (SMTP input) | |
1282 | FALSE there are no more messages to be read (non-SMTP input | |
1283 | or SMTP connection collapsed, or other failure) | |
1284 | ||
1285 | When reading a message for filter testing, the returned value indicates | |
1286 | whether the headers (which is all that is read) were terminated by '.' or | |
1287 | not. */ | |
1288 | ||
1289 | BOOL | |
1290 | receive_msg(BOOL extract_recip) | |
1291 | { | |
1292 | int i, rc; | |
1293 | int msg_size = 0; | |
1294 | int process_info_len = Ustrlen(process_info); | |
1295 | int error_rc = (error_handling == ERRORS_SENDER)? | |
1296 | errors_sender_rc : EXIT_FAILURE; | |
1297 | int header_size = 256; | |
1298 | int start, end, domain, size, sptr; | |
1299 | int id_resolution; | |
1300 | int had_zero = 0; | |
d677b2f2 | 1301 | int prevlines_length = 0; |
059ec3d9 PH |
1302 | |
1303 | register int ptr = 0; | |
1304 | ||
1305 | BOOL contains_resent_headers = FALSE; | |
1306 | BOOL extracted_ignored = FALSE; | |
1307 | BOOL first_line_ended_crlf = TRUE_UNSET; | |
1308 | BOOL smtp_yield = TRUE; | |
1309 | BOOL yield = FALSE; | |
1310 | ||
1311 | BOOL resents_exist = FALSE; | |
1312 | uschar *resent_prefix = US""; | |
1313 | uschar *blackholed_by = NULL; | |
04f7d5b9 | 1314 | uschar *blackhole_log_msg = US""; |
059ec3d9 PH |
1315 | |
1316 | flock_t lock_data; | |
1317 | error_block *bad_addresses = NULL; | |
1318 | ||
1319 | uschar *frozen_by = NULL; | |
1320 | uschar *queued_by = NULL; | |
1321 | ||
1322 | uschar *errmsg, *s; | |
1323 | struct stat statbuf; | |
1324 | ||
4e88a19f | 1325 | /* Final message to give to SMTP caller, and messages from ACLs */ |
059ec3d9 PH |
1326 | |
1327 | uschar *smtp_reply = NULL; | |
4e88a19f | 1328 | uschar *user_msg, *log_msg; |
059ec3d9 PH |
1329 | |
1330 | /* Working header pointers */ | |
1331 | ||
1332 | header_line *h, *next; | |
1333 | ||
2cbb4081 | 1334 | /* Flags for noting the existence of certain headers (only one left) */ |
059ec3d9 PH |
1335 | |
1336 | BOOL date_header_exists = FALSE; | |
1337 | ||
1338 | /* Pointers to receive the addresses of headers whose contents we need. */ | |
1339 | ||
1340 | header_line *from_header = NULL; | |
1341 | header_line *subject_header = NULL; | |
1342 | header_line *msgid_header = NULL; | |
1343 | header_line *received_header; | |
1344 | ||
1345 | /* Variables for use when building the Received: header. */ | |
1346 | ||
1347 | uschar *received; | |
1348 | uschar *timestamp; | |
1349 | int tslen; | |
1350 | ||
1351 | /* Release any open files that might have been cached while preparing to | |
1352 | accept the message - e.g. by verifying addresses - because reading a message | |
1353 | might take a fair bit of real time. */ | |
1354 | ||
1355 | search_tidyup(); | |
1356 | ||
1357 | /* Initialize the chain of headers by setting up a place-holder for Received: | |
1358 | header. Temporarily mark it as "old", i.e. not to be used. We keep header_last | |
1359 | pointing to the end of the chain to make adding headers simple. */ | |
1360 | ||
1361 | received_header = header_list = header_last = store_get(sizeof(header_line)); | |
1362 | header_list->next = NULL; | |
1363 | header_list->type = htype_old; | |
1364 | header_list->text = NULL; | |
1365 | header_list->slen = 0; | |
1366 | ||
1367 | /* Control block for the next header to be read. */ | |
1368 | ||
1369 | next = store_get(sizeof(header_line)); | |
1370 | next->text = store_get(header_size); | |
1371 | ||
1372 | /* Initialize message id to be null (indicating no message read), and the | |
1373 | header names list to be the normal list. Indicate there is no data file open | |
1374 | yet, initialize the size and warning count, and deal with no size limit. */ | |
1375 | ||
1376 | message_id[0] = 0; | |
1377 | data_file = NULL; | |
1378 | data_fd = -1; | |
1379 | spool_name[0] = 0; | |
1380 | message_size = 0; | |
1381 | warning_count = 0; | |
d677b2f2 | 1382 | received_count = 1; /* For the one we will add */ |
059ec3d9 PH |
1383 | |
1384 | if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX; | |
1385 | ||
2e0c1448 | 1386 | /* While reading the message, the following counts are computed. */ |
059ec3d9 | 1387 | |
d677b2f2 PH |
1388 | message_linecount = body_linecount = body_zerocount = |
1389 | max_received_linelength = 0; | |
059ec3d9 | 1390 | |
fb2274d4 TK |
1391 | #ifdef EXPERIMENTAL_DOMAINKEYS |
1392 | /* Call into DK to set up the context. Check if DK is to be run are carried out | |
1393 | inside dk_exim_verify_init(). */ | |
1394 | dk_exim_verify_init(); | |
1395 | #endif | |
1396 | ||
059ec3d9 PH |
1397 | /* Remember the time of reception. Exim uses time+pid for uniqueness of message |
1398 | ids, and fractions of a second are required. See the comments that precede the | |
1399 | message id creation below. */ | |
1400 | ||
1401 | (void)gettimeofday(&message_id_tv, NULL); | |
1402 | ||
1403 | /* For other uses of the received time we can operate with granularity of one | |
1404 | second, and for that we use the global variable received_time. This is for | |
1405 | things like ultimate message timeouts. */ | |
1406 | ||
1407 | received_time = message_id_tv.tv_sec; | |
1408 | ||
1409 | /* If SMTP input, set the special handler for timeouts. The alarm() calls | |
1410 | happen in the smtp_getc() function when it refills its buffer. */ | |
1411 | ||
1412 | if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler); | |
1413 | ||
1414 | /* If not SMTP input, timeout happens only if configured, and we just set a | |
1415 | single timeout for the whole message. */ | |
1416 | ||
1417 | else if (receive_timeout > 0) | |
1418 | { | |
1419 | os_non_restarting_signal(SIGALRM, data_timeout_handler); | |
1420 | alarm(receive_timeout); | |
1421 | } | |
1422 | ||
1423 | /* SIGTERM and SIGINT are caught always. */ | |
1424 | ||
1425 | signal(SIGTERM, data_sigterm_sigint_handler); | |
1426 | signal(SIGINT, data_sigterm_sigint_handler); | |
1427 | ||
1428 | /* Header lines in messages are not supposed to be very long, though when | |
1429 | unfolded, to: and cc: headers can take up a lot of store. We must also cope | |
1430 | with the possibility of junk being thrown at us. Start by getting 256 bytes for | |
1431 | storing the header, and extend this as necessary using string_cat(). | |
1432 | ||
1433 | To cope with total lunacies, impose an upper limit on the length of the header | |
1434 | section of the message, as otherwise the store will fill up. We must also cope | |
1435 | with the possibility of binary zeros in the data. Hence we cannot use fgets(). | |
1436 | Folded header lines are joined into one string, leaving the '\n' characters | |
1437 | inside them, so that writing them out reproduces the input. | |
1438 | ||
1439 | Loop for each character of each header; the next structure for chaining the | |
1440 | header is set up already, with ptr the offset of the next character in | |
1441 | next->text. */ | |
1442 | ||
1443 | for (;;) | |
1444 | { | |
fb2274d4 | 1445 | int ch = (RECEIVE_GETC)(); |
059ec3d9 PH |
1446 | |
1447 | /* If we hit EOF on a SMTP connection, it's an error, since incoming | |
1448 | SMTP must have a correct "." terminator. */ | |
1449 | ||
1450 | if (ch == EOF && smtp_input /* && !smtp_batched_input */) | |
1451 | { | |
1452 | smtp_reply = handle_lost_connection(US" (header)"); | |
1453 | smtp_yield = FALSE; | |
1454 | goto TIDYUP; /* Skip to end of function */ | |
1455 | } | |
1456 | ||
1457 | /* See if we are at the current header's size limit - there must be at least | |
1458 | four bytes left. This allows for the new character plus a zero, plus two for | |
1459 | extra insertions when we are playing games with dots and carriage returns. If | |
1460 | we are at the limit, extend the text buffer. This could have been done | |
1461 | automatically using string_cat() but because this is a tightish loop storing | |
1462 | only one character at a time, we choose to do it inline. Normally | |
1463 | store_extend() will be able to extend the block; only at the end of a big | |
1464 | store block will a copy be needed. To handle the case of very long headers | |
1465 | (and sometimes lunatic messages can have ones that are 100s of K long) we | |
1466 | call store_release() for strings that have been copied - if the string is at | |
1467 | the start of a block (and therefore the only thing in it, because we aren't | |
1468 | doing any other gets), the block gets freed. We can only do this because we | |
1469 | know there are no other calls to store_get() going on. */ | |
1470 | ||
1471 | if (ptr >= header_size - 4) | |
1472 | { | |
1473 | int oldsize = header_size; | |
1474 | /* header_size += 256; */ | |
1475 | header_size *= 2; | |
1476 | if (!store_extend(next->text, oldsize, header_size)) | |
1477 | { | |
1478 | uschar *newtext = store_get(header_size); | |
1479 | memcpy(newtext, next->text, ptr); | |
1480 | store_release(next->text); | |
1481 | next->text = newtext; | |
1482 | } | |
1483 | } | |
1484 | ||
1485 | /* Cope with receiving a binary zero. There is dispute about whether | |
1486 | these should be allowed in RFC 822 messages. The middle view is that they | |
1487 | should not be allowed in headers, at least. Exim takes this attitude at | |
1488 | the moment. We can't just stomp on them here, because we don't know that | |
1489 | this line is a header yet. Set a flag to cause scanning later. */ | |
1490 | ||
1491 | if (ch == 0) had_zero++; | |
1492 | ||
1493 | /* Test for termination. Lines in remote SMTP are terminated by CRLF, while | |
1494 | those from data files use just LF. Treat LF in local SMTP input as a | |
1495 | terminator too. Treat EOF as a line terminator always. */ | |
1496 | ||
1497 | if (ch == EOF) goto EOL; | |
1498 | ||
1499 | /* FUDGE: There are sites out there that don't send CRs before their LFs, and | |
1500 | other MTAs accept this. We are therefore forced into this "liberalisation" | |
1501 | too, so we accept LF as a line terminator whatever the source of the message. | |
1502 | However, if the first line of the message ended with a CRLF, we treat a bare | |
1503 | LF specially by inserting a white space after it to ensure that the header | |
1504 | line is not terminated. */ | |
1505 | ||
1506 | if (ch == '\n') | |
1507 | { | |
1508 | if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE; | |
fb2274d4 | 1509 | else if (first_line_ended_crlf) RECEIVE_UNGETC(' '); |
059ec3d9 PH |
1510 | goto EOL; |
1511 | } | |
1512 | ||
1513 | /* This is not the end of the line. If this is SMTP input and this is | |
1514 | the first character in the line and it is a "." character, ignore it. | |
1515 | This implements the dot-doubling rule, though header lines starting with | |
1516 | dots aren't exactly common. They are legal in RFC 822, though. If the | |
1517 | following is CRLF or LF, this is the line that that terminates the | |
1518 | entire message. We set message_ended to indicate this has happened (to | |
1519 | prevent further reading), and break out of the loop, having freed the | |
1520 | empty header, and set next = NULL to indicate no data line. */ | |
1521 | ||
1522 | if (ptr == 0 && ch == '.' && (smtp_input || dot_ends)) | |
1523 | { | |
fb2274d4 | 1524 | ch = (RECEIVE_GETC)(); |
059ec3d9 PH |
1525 | if (ch == '\r') |
1526 | { | |
fb2274d4 | 1527 | ch = (RECEIVE_GETC)(); |
059ec3d9 PH |
1528 | if (ch != '\n') |
1529 | { | |
fb2274d4 | 1530 | RECEIVE_UNGETC(ch); |
059ec3d9 PH |
1531 | ch = '\r'; /* Revert to CR */ |
1532 | } | |
1533 | } | |
1534 | if (ch == '\n') | |
1535 | { | |
1536 | message_ended = END_DOT; | |
1537 | store_reset(next); | |
1538 | next = NULL; | |
1539 | break; /* End character-reading loop */ | |
1540 | } | |
1541 | ||
1542 | /* For non-SMTP input, the dot at the start of the line was really a data | |
1543 | character. What is now in ch is the following character. We guaranteed | |
1544 | enough space for this above. */ | |
1545 | ||
1546 | if (!smtp_input) | |
1547 | { | |
1548 | next->text[ptr++] = '.'; | |
1549 | message_size++; | |
1550 | } | |
1551 | } | |
1552 | ||
1553 | /* If CR is immediately followed by LF, end the line, ignoring the CR, and | |
1554 | remember this case if this is the first line ending. */ | |
1555 | ||
1556 | if (ch == '\r') | |
1557 | { | |
fb2274d4 | 1558 | ch = (RECEIVE_GETC)(); |
059ec3d9 PH |
1559 | if (ch == '\n') |
1560 | { | |
1561 | if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE; | |
1562 | goto EOL; | |
1563 | } | |
1564 | ||
1565 | /* Otherwise, put back the character after CR, and turn the bare CR | |
1566 | into LF SP. */ | |
1567 | ||
fb2274d4 | 1568 | ch = (RECEIVE_UNGETC)(ch); |
059ec3d9 PH |
1569 | next->text[ptr++] = '\n'; |
1570 | message_size++; | |
1571 | ch = ' '; | |
1572 | } | |
1573 | ||
1574 | /* We have a data character for the header line. */ | |
1575 | ||
1576 | next->text[ptr++] = ch; /* Add to buffer */ | |
1577 | message_size++; /* Total message size so far */ | |
1578 | ||
1579 | /* Handle failure due to a humungously long header section. The >= allows | |
1580 | for the terminating \n. Add what we have so far onto the headers list so | |
1581 | that it gets reflected in any error message, and back up the just-read | |
1582 | character. */ | |
1583 | ||
1584 | if (message_size >= header_maxsize) | |
1585 | { | |
1586 | next->text[ptr] = 0; | |
1587 | next->slen = ptr; | |
1588 | next->type = htype_other; | |
1589 | next->next = NULL; | |
1590 | header_last->next = next; | |
1591 | header_last = next; | |
1592 | ||
1593 | log_write(0, LOG_MAIN, "ridiculously long message header received from " | |
1594 | "%s (more than %d characters): message abandoned", | |
1595 | sender_host_unknown? sender_ident : sender_fullhost, header_maxsize); | |
1596 | ||
1597 | if (smtp_input) | |
1598 | { | |
1599 | smtp_reply = US"552 Message header is ridiculously long"; | |
1600 | receive_swallow_smtp(); | |
1601 | goto TIDYUP; /* Skip to end of function */ | |
1602 | } | |
1603 | ||
1604 | else | |
1605 | { | |
1606 | give_local_error(ERRMESS_VLONGHEADER, | |
1607 | string_sprintf("message header longer than %d characters received: " | |
1608 | "message not accepted", header_maxsize), US"", error_rc, stdin, | |
1609 | header_list->next); | |
1610 | /* Does not return */ | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | continue; /* With next input character */ | |
1615 | ||
1616 | /* End of header line reached */ | |
1617 | ||
1618 | EOL: | |
2e0c1448 PH |
1619 | |
1620 | /* Keep track of lines for BSMTP errors and overall message_linecount. */ | |
1621 | ||
1622 | receive_linecount++; | |
1623 | message_linecount++; | |
059ec3d9 | 1624 | |
d677b2f2 PH |
1625 | /* Keep track of maximum line length */ |
1626 | ||
1627 | if (ptr - prevlines_length > max_received_linelength) | |
1628 | max_received_linelength = ptr - prevlines_length; | |
1629 | prevlines_length = ptr + 1; | |
1630 | ||
059ec3d9 PH |
1631 | /* Now put in the terminating newline. There is always space for |
1632 | at least two more characters. */ | |
1633 | ||
1634 | next->text[ptr++] = '\n'; | |
1635 | message_size++; | |
1636 | ||
1637 | /* A blank line signals the end of the headers; release the unwanted | |
1638 | space and set next to NULL to indicate this. */ | |
1639 | ||
1640 | if (ptr == 1) | |
1641 | { | |
1642 | store_reset(next); | |
1643 | next = NULL; | |
1644 | break; | |
1645 | } | |
1646 | ||
1647 | /* There is data in the line; see if the next input character is a | |
1648 | whitespace character. If it is, we have a continuation of this header line. | |
1649 | There is always space for at least one character at this point. */ | |
1650 | ||
1651 | if (ch != EOF) | |
1652 | { | |
fb2274d4 | 1653 | int nextch = (RECEIVE_GETC)(); |
059ec3d9 PH |
1654 | if (nextch == ' ' || nextch == '\t') |
1655 | { | |
1656 | next->text[ptr++] = nextch; | |
1657 | message_size++; | |
1658 | continue; /* Iterate the loop */ | |
1659 | } | |
fb2274d4 | 1660 | else if (nextch != EOF) (RECEIVE_UNGETC)(nextch); /* For next time */ |
059ec3d9 PH |
1661 | else ch = EOF; /* Cause main loop to exit at end */ |
1662 | } | |
1663 | ||
1664 | /* We have got to the real line end. Terminate the string and release store | |
1665 | beyond it. If it turns out to be a real header, internal binary zeros will | |
1666 | be squashed later. */ | |
1667 | ||
1668 | next->text[ptr] = 0; | |
1669 | next->slen = ptr; | |
1670 | store_reset(next->text + ptr + 1); | |
1671 | ||
1672 | /* Check the running total size against the overall message size limit. We | |
1673 | don't expect to fail here, but if the overall limit is set less than MESSAGE_ | |
1674 | MAXSIZE and a big header is sent, we want to catch it. Just stop reading | |
1675 | headers - the code to read the body will then also hit the buffer. */ | |
1676 | ||
1677 | if (message_size > thismessage_size_limit) break; | |
1678 | ||
1679 | /* A line that is not syntactically correct for a header also marks | |
1680 | the end of the headers. In this case, we leave next containing the | |
1681 | first data line. This might actually be several lines because of the | |
1682 | continuation logic applied above, but that doesn't matter. | |
1683 | ||
1684 | It turns out that smail, and presumably sendmail, accept leading lines | |
1685 | of the form | |
1686 | ||
1687 | From ph10 Fri Jan 5 12:35 GMT 1996 | |
1688 | ||
1689 | in messages. The "mail" command on Solaris 2 sends such lines. I cannot | |
1690 | find any documentation of this, but for compatibility it had better be | |
1691 | accepted. Exim restricts it to the case of non-smtp messages, and | |
1692 | treats it as an alternative to the -f command line option. Thus it is | |
1693 | ignored except for trusted users or filter testing. Otherwise it is taken | |
1694 | as the sender address, unless -f was used (sendmail compatibility). | |
1695 | ||
1696 | It further turns out that some UUCPs generate the From_line in a different | |
1697 | format, e.g. | |
1698 | ||
1699 | From ph10 Fri, 7 Jan 97 14:00:00 GMT | |
1700 | ||
1701 | The regex for matching these things is now capable of recognizing both | |
1702 | formats (including 2- and 4-digit years in the latter). In fact, the regex | |
1703 | is now configurable, as is the expansion string to fish out the sender. | |
1704 | ||
1705 | Even further on it has been discovered that some broken clients send | |
1706 | these lines in SMTP messages. There is now an option to ignore them from | |
1707 | specified hosts or networks. Sigh. */ | |
1708 | ||
1709 | if (header_last == header_list && | |
1710 | (!smtp_input | |
1711 | || | |
1712 | (sender_host_address != NULL && | |
1713 | verify_check_host(&ignore_fromline_hosts) == OK) | |
1714 | || | |
1715 | (sender_host_address == NULL && ignore_fromline_local) | |
1716 | ) && | |
1717 | regex_match_and_setup(regex_From, next->text, 0, -1)) | |
1718 | { | |
1719 | if (!sender_address_forced) | |
1720 | { | |
1721 | uschar *uucp_sender = expand_string(uucp_from_sender); | |
1722 | if (uucp_sender == NULL) | |
1723 | { | |
1724 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1725 | "expansion of \"%s\" failed after matching " | |
1726 | "\"From \" line: %s", uucp_from_sender, expand_string_message); | |
1727 | } | |
1728 | else | |
1729 | { | |
1730 | int start, end, domain; | |
1731 | uschar *errmess; | |
1732 | uschar *newsender = parse_extract_address(uucp_sender, &errmess, | |
1733 | &start, &end, &domain, TRUE); | |
1734 | if (newsender != NULL) | |
1735 | { | |
1736 | if (domain == 0 && newsender[0] != 0) | |
1737 | newsender = rewrite_address_qualify(newsender, FALSE); | |
1738 | ||
f05da2e8 | 1739 | if (filter_test != FTEST_NONE || receive_check_set_sender(newsender)) |
059ec3d9 PH |
1740 | { |
1741 | sender_address = newsender; | |
1742 | ||
f05da2e8 | 1743 | if (trusted_caller || filter_test != FTEST_NONE) |
059ec3d9 PH |
1744 | { |
1745 | authenticated_sender = NULL; | |
1746 | originator_name = US""; | |
1747 | sender_local = FALSE; | |
1748 | } | |
1749 | ||
f05da2e8 | 1750 | if (filter_test != FTEST_NONE) |
059ec3d9 PH |
1751 | printf("Sender taken from \"From \" line\n"); |
1752 | } | |
1753 | } | |
1754 | } | |
1755 | } | |
1756 | } | |
1757 | ||
1758 | /* Not a leading "From " line. Check to see if it is a valid header line. | |
1759 | Header names may contain any non-control characters except space and colon, | |
1760 | amazingly. */ | |
1761 | ||
1762 | else | |
1763 | { | |
1764 | uschar *p = next->text; | |
1765 | ||
1766 | /* If not a valid header line, break from the header reading loop, leaving | |
1767 | next != NULL, indicating that it holds the first line of the body. */ | |
1768 | ||
1769 | if (isspace(*p)) break; | |
1770 | while (mac_isgraph(*p) && *p != ':') p++; | |
1771 | while (isspace(*p)) p++; | |
1772 | if (*p != ':') | |
1773 | { | |
1774 | body_zerocount = had_zero; | |
1775 | break; | |
1776 | } | |
1777 | ||
1778 | /* We have a valid header line. If there were any binary zeroes in | |
1779 | the line, stomp on them here. */ | |
1780 | ||
1781 | if (had_zero > 0) | |
1782 | for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?'; | |
1783 | ||
1784 | /* It is perfectly legal to have an empty continuation line | |
1785 | at the end of a header, but it is confusing to humans | |
1786 | looking at such messages, since it looks like a blank line. | |
1787 | Reduce confusion by removing redundant white space at the | |
1788 | end. We know that there is at least one printing character | |
1789 | (the ':' tested for above) so there is no danger of running | |
1790 | off the end. */ | |
1791 | ||
1792 | p = next->text + ptr - 2; | |
1793 | for (;;) | |
1794 | { | |
1795 | while (*p == ' ' || *p == '\t') p--; | |
1796 | if (*p != '\n') break; | |
1797 | ptr = (p--) - next->text + 1; | |
1798 | message_size -= next->slen - ptr; | |
1799 | next->text[ptr] = 0; | |
1800 | next->slen = ptr; | |
1801 | } | |
1802 | ||
1803 | /* Add the header to the chain */ | |
1804 | ||
1805 | next->type = htype_other; | |
1806 | next->next = NULL; | |
1807 | header_last->next = next; | |
1808 | header_last = next; | |
1809 | ||
1810 | /* Check the limit for individual line lengths. This comes after adding to | |
1811 | the chain so that the failing line is reflected if a bounce is generated | |
1812 | (for a local message). */ | |
1813 | ||
1814 | if (header_line_maxsize > 0 && next->slen > header_line_maxsize) | |
1815 | { | |
1816 | log_write(0, LOG_MAIN, "overlong message header line received from " | |
1817 | "%s (more than %d characters): message abandoned", | |
1818 | sender_host_unknown? sender_ident : sender_fullhost, | |
1819 | header_line_maxsize); | |
1820 | ||
1821 | if (smtp_input) | |
1822 | { | |
1823 | smtp_reply = US"552 A message header line is too long"; | |
1824 | receive_swallow_smtp(); | |
1825 | goto TIDYUP; /* Skip to end of function */ | |
1826 | } | |
1827 | ||
1828 | else | |
1829 | { | |
1830 | give_local_error(ERRMESS_VLONGHDRLINE, | |
1831 | string_sprintf("message header line longer than %d characters " | |
1832 | "received: message not accepted", header_line_maxsize), US"", | |
1833 | error_rc, stdin, header_list->next); | |
1834 | /* Does not return */ | |
1835 | } | |
1836 | } | |
1837 | ||
1838 | /* Note if any resent- fields exist. */ | |
1839 | ||
1840 | if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0) | |
1841 | { | |
1842 | resents_exist = TRUE; | |
1843 | resent_prefix = US"Resent-"; | |
1844 | } | |
1845 | } | |
1846 | ||
1847 | /* The line has been handled. If we have hit EOF, break out of the loop, | |
1848 | indicating no pending data line. */ | |
1849 | ||
1850 | if (ch == EOF) { next = NULL; break; } | |
1851 | ||
1852 | /* Set up for the next header */ | |
1853 | ||
1854 | header_size = 256; | |
1855 | next = store_get(sizeof(header_line)); | |
1856 | next->text = store_get(header_size); | |
1857 | ptr = 0; | |
1858 | had_zero = 0; | |
d677b2f2 | 1859 | prevlines_length = 0; |
059ec3d9 PH |
1860 | } /* Continue, starting to read the next header */ |
1861 | ||
1862 | /* At this point, we have read all the headers into a data structure in main | |
1863 | store. The first header is still the dummy placeholder for the Received: header | |
1864 | we are going to generate a bit later on. If next != NULL, it contains the first | |
1865 | data line - which terminated the headers before reaching a blank line (not the | |
1866 | normal case). */ | |
1867 | ||
1868 | DEBUG(D_receive) | |
1869 | { | |
1870 | debug_printf(">>Headers received:\n"); | |
1871 | for (h = header_list->next; h != NULL; h = h->next) | |
1872 | debug_printf("%s", h->text); | |
1873 | debug_printf("\n"); | |
1874 | } | |
1875 | ||
1876 | /* End of file on any SMTP connection is an error. If an incoming SMTP call | |
1877 | is dropped immediately after valid headers, the next thing we will see is EOF. | |
1878 | We must test for this specially, as further down the reading of the data is | |
1879 | skipped if already at EOF. */ | |
1880 | ||
1881 | if (smtp_input && (receive_feof)()) | |
1882 | { | |
1883 | smtp_reply = handle_lost_connection(US" (after header)"); | |
1884 | smtp_yield = FALSE; | |
1885 | goto TIDYUP; /* Skip to end of function */ | |
1886 | } | |
1887 | ||
1888 | /* If this is a filter test run and no headers were read, output a warning | |
1889 | in case there is a mistake in the test message. */ | |
1890 | ||
f05da2e8 | 1891 | if (filter_test != FTEST_NONE && header_list->next == NULL) |
059ec3d9 PH |
1892 | printf("Warning: no message headers read\n"); |
1893 | ||
1894 | ||
1895 | /* Scan the headers to identify them. Some are merely marked for later | |
1896 | processing; some are dealt with here. */ | |
1897 | ||
1898 | for (h = header_list->next; h != NULL; h = h->next) | |
1899 | { | |
1900 | BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0; | |
1901 | if (is_resent) contains_resent_headers = TRUE; | |
1902 | ||
1903 | switch (header_checkname(h, is_resent)) | |
1904 | { | |
059ec3d9 | 1905 | case htype_bcc: |
2cbb4081 | 1906 | h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */ |
059ec3d9 PH |
1907 | break; |
1908 | ||
059ec3d9 | 1909 | case htype_cc: |
2cbb4081 | 1910 | h->type = htype_cc; /* Both Cc: and Resent-Cc: */ |
059ec3d9 PH |
1911 | break; |
1912 | ||
1913 | /* Record whether a Date: or Resent-Date: header exists, as appropriate. */ | |
1914 | ||
1915 | case htype_date: | |
1916 | date_header_exists = !resents_exist || is_resent; | |
1917 | break; | |
1918 | ||
1919 | /* Same comments as about Return-Path: below. */ | |
1920 | ||
1921 | case htype_delivery_date: | |
1922 | if (delivery_date_remove) h->type = htype_old; | |
1923 | break; | |
1924 | ||
1925 | /* Same comments as about Return-Path: below. */ | |
1926 | ||
1927 | case htype_envelope_to: | |
1928 | if (envelope_to_remove) h->type = htype_old; | |
1929 | break; | |
1930 | ||
1931 | /* Mark all "From:" headers so they get rewritten. Save the one that is to | |
1932 | be used for Sender: checking. For Sendmail compatibility, if the "From:" | |
1933 | header consists of just the login id of the user who called Exim, rewrite | |
1934 | it with the gecos field first. Apply this rule to Resent-From: if there | |
1935 | are resent- fields. */ | |
1936 | ||
1937 | case htype_from: | |
1938 | h->type = htype_from; | |
1939 | if (!resents_exist || is_resent) | |
1940 | { | |
1941 | from_header = h; | |
1942 | if (!smtp_input) | |
1943 | { | |
1944 | uschar *s = Ustrchr(h->text, ':') + 1; | |
1945 | while (isspace(*s)) s++; | |
1946 | if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0) | |
1947 | { | |
1948 | uschar *name = is_resent? US"Resent-From" : US"From"; | |
1949 | header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name, | |
1950 | originator_login, qualify_domain_sender); | |
1951 | from_header = header_last; | |
1952 | h->type = htype_old; | |
1953 | DEBUG(D_receive|D_rewrite) | |
1954 | debug_printf("rewrote \"%s:\" header using gecos\n", name); | |
1955 | } | |
1956 | } | |
1957 | } | |
1958 | break; | |
1959 | ||
1960 | /* Identify the Message-id: header for generating "in-reply-to" in the | |
1961 | autoreply transport. For incoming logging, save any resent- value. In both | |
1962 | cases, take just the first of any multiples. */ | |
1963 | ||
1964 | case htype_id: | |
1965 | if (msgid_header == NULL && (!resents_exist || is_resent)) | |
1966 | { | |
1967 | msgid_header = h; | |
1968 | h->type = htype_id; | |
1969 | } | |
1970 | break; | |
1971 | ||
1972 | /* Flag all Received: headers */ | |
1973 | ||
1974 | case htype_received: | |
1975 | h->type = htype_received; | |
1976 | received_count++; | |
1977 | break; | |
1978 | ||
1979 | /* "Reply-to:" is just noted (there is no resent-reply-to field) */ | |
1980 | ||
1981 | case htype_reply_to: | |
1982 | h->type = htype_reply_to; | |
1983 | break; | |
1984 | ||
1985 | /* The Return-path: header is supposed to be added to messages when | |
1986 | they leave the SMTP system. We shouldn't receive messages that already | |
1987 | contain Return-path. However, since Exim generates Return-path: on | |
1988 | local delivery, resent messages may well contain it. We therefore | |
1989 | provide an option (which defaults on) to remove any Return-path: headers | |
1990 | on input. Removal actually means flagging as "old", which prevents the | |
1991 | header being transmitted with the message. */ | |
1992 | ||
1993 | case htype_return_path: | |
1994 | if (return_path_remove) h->type = htype_old; | |
1995 | ||
1996 | /* If we are testing a mail filter file, use the value of the | |
1997 | Return-Path: header to set up the return_path variable, which is not | |
1998 | otherwise set. However, remove any <> that surround the address | |
1999 | because the variable doesn't have these. */ | |
2000 | ||
f05da2e8 | 2001 | if (filter_test != FTEST_NONE) |
059ec3d9 PH |
2002 | { |
2003 | uschar *start = h->text + 12; | |
2004 | uschar *end = start + Ustrlen(start); | |
2005 | while (isspace(*start)) start++; | |
2006 | while (end > start && isspace(end[-1])) end--; | |
2007 | if (*start == '<' && end[-1] == '>') | |
2008 | { | |
2009 | start++; | |
2010 | end--; | |
2011 | } | |
2012 | return_path = string_copyn(start, end - start); | |
2013 | printf("Return-path taken from \"Return-path:\" header line\n"); | |
2014 | } | |
2015 | break; | |
2016 | ||
2017 | /* If there is a "Sender:" header and the message is locally originated, | |
8800895a PH |
2018 | and from an untrusted caller and suppress_local_fixups is not set, or if we |
2019 | are in submission mode for a remote message, mark it "old" so that it will | |
2020 | not be transmitted with the message, unless active_local_sender_retain is | |
2021 | set. (This can only be true if active_local_from_check is false.) If there | |
2022 | are any resent- headers in the message, apply this rule to Resent-Sender: | |
2023 | instead of Sender:. Messages with multiple resent- header sets cannot be | |
2024 | tidily handled. (For this reason, at least one MUA - Pine - turns old | |
2025 | resent- headers into X-resent- headers when resending, leaving just one | |
2026 | set.) */ | |
059ec3d9 PH |
2027 | |
2028 | case htype_sender: | |
69358f02 | 2029 | h->type = ((!active_local_sender_retain && |
8800895a PH |
2030 | ( |
2031 | (sender_local && !trusted_caller && !suppress_local_fixups) | |
2032 | || submission_mode | |
2033 | ) | |
059ec3d9 PH |
2034 | ) && |
2035 | (!resents_exist||is_resent))? | |
2036 | htype_old : htype_sender; | |
2037 | break; | |
2038 | ||
2039 | /* Remember the Subject: header for logging. There is no Resent-Subject */ | |
2040 | ||
2041 | case htype_subject: | |
2042 | subject_header = h; | |
2043 | break; | |
2044 | ||
2045 | /* "To:" gets flagged, and the existence of a recipient header is noted, | |
2046 | whether it's resent- or not. */ | |
2047 | ||
2048 | case htype_to: | |
2049 | h->type = htype_to; | |
2050 | /**** | |
2051 | to_or_cc_header_exists = TRUE; | |
2052 | ****/ | |
2053 | break; | |
2054 | } | |
2055 | } | |
2056 | ||
2057 | /* Extract recipients from the headers if that is required (the -t option). | |
2058 | Note that this is documented as being done *before* any address rewriting takes | |
2059 | place. There are two possibilities: | |
2060 | ||
2061 | (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any | |
2062 | recipients already listed are to be REMOVED from the message. Smail 3 works | |
2063 | like this. We need to build a non-recipients tree for that list, because in | |
2064 | subsequent processing this data is held in a tree and that's what the | |
2065 | spool_write_header() function expects. Make sure that non-recipient addresses | |
2066 | are fully qualified and rewritten if necessary. | |
2067 | ||
2068 | (2) According to other sendmail documentation, -t ADDS extracted recipients to | |
2069 | those in the command line arguments (and it is rumoured some other MTAs do | |
2070 | this). Therefore, there is an option to make Exim behave this way. | |
2071 | ||
2072 | *** Notes on "Resent-" header lines *** | |
2073 | ||
2074 | The presence of resent-headers in the message makes -t horribly ambiguous. | |
2075 | Experiments with sendmail showed that it uses recipients for all resent- | |
2076 | headers, totally ignoring the concept of "sets of resent- headers" as described | |
2077 | in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set | |
2078 | with all the addresses in one instance of each header. | |
2079 | ||
2080 | This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an | |
2081 | error for -t if there were resent- headers in the message. However, after a | |
2082 | discussion on the mailing list, I've learned that there are MUAs that use | |
2083 | resent- headers with -t, and also that the stuff about sets of resent- headers | |
2084 | and their ordering in RFC 2822 is generally ignored. An MUA that submits a | |
2085 | message with -t and resent- header lines makes sure that only *its* resent- | |
2086 | headers are present; previous ones are often renamed as X-resent- for example. | |
2087 | ||
2088 | Consequently, Exim has been changed so that, if any resent- header lines are | |
2089 | present, the recipients are taken from all of the appropriate resent- lines, | |
2090 | and not from the ordinary To:, Cc:, etc. */ | |
2091 | ||
2092 | if (extract_recip) | |
2093 | { | |
2094 | int rcount = 0; | |
2095 | error_block **bnext = &bad_addresses; | |
2096 | ||
2097 | if (extract_addresses_remove_arguments) | |
2098 | { | |
2099 | while (recipients_count-- > 0) | |
2100 | { | |
2101 | uschar *s = rewrite_address(recipients_list[recipients_count].address, | |
2102 | TRUE, TRUE, global_rewrite_rules, rewrite_existflags); | |
2103 | tree_add_nonrecipient(s); | |
2104 | } | |
2105 | recipients_list = NULL; | |
2106 | recipients_count = recipients_list_max = 0; | |
2107 | } | |
2108 | ||
059ec3d9 PH |
2109 | /* Now scan the headers */ |
2110 | ||
2111 | for (h = header_list->next; h != NULL; h = h->next) | |
2112 | { | |
2113 | if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) && | |
2114 | (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0)) | |
2115 | { | |
2116 | uschar *s = Ustrchr(h->text, ':') + 1; | |
2117 | while (isspace(*s)) s++; | |
2118 | ||
1eccaa59 PH |
2119 | parse_allow_group = TRUE; /* Allow address group syntax */ |
2120 | ||
059ec3d9 PH |
2121 | while (*s != 0) |
2122 | { | |
2123 | uschar *ss = parse_find_address_end(s, FALSE); | |
2124 | uschar *recipient, *errmess, *p, *pp; | |
2125 | int start, end, domain; | |
2126 | ||
2127 | /* Check on maximum */ | |
2128 | ||
2129 | if (recipients_max > 0 && ++rcount > recipients_max) | |
2130 | { | |
2131 | give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients", | |
2132 | US"message rejected: ", error_rc, stdin, NULL); | |
2133 | /* Does not return */ | |
2134 | } | |
2135 | ||
2136 | /* Make a copy of the address, and remove any internal newlines. These | |
2137 | may be present as a result of continuations of the header line. The | |
2138 | white space that follows the newline must not be removed - it is part | |
2139 | of the header. */ | |
2140 | ||
2141 | pp = recipient = store_get(ss - s + 1); | |
2142 | for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p; | |
2143 | *pp = 0; | |
2144 | recipient = parse_extract_address(recipient, &errmess, &start, &end, | |
2145 | &domain, FALSE); | |
2146 | ||
2147 | /* Keep a list of all the bad addresses so we can send a single | |
2148 | error message at the end. However, an empty address is not an error; | |
2149 | just ignore it. This can come from an empty group list like | |
2150 | ||
2151 | To: Recipients of list:; | |
2152 | ||
2153 | If there are no recipients at all, an error will occur later. */ | |
2154 | ||
2155 | if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0) | |
2156 | { | |
2157 | int len = Ustrlen(s); | |
2158 | error_block *b = store_get(sizeof(error_block)); | |
2159 | while (len > 0 && isspace(s[len-1])) len--; | |
2160 | b->next = NULL; | |
2161 | b->text1 = string_printing(string_copyn(s, len)); | |
2162 | b->text2 = errmess; | |
2163 | *bnext = b; | |
2164 | bnext = &(b->next); | |
2165 | } | |
2166 | ||
2167 | /* If the recipient is already in the nonrecipients tree, it must | |
2168 | have appeared on the command line with the option extract_addresses_ | |
2169 | remove_arguments set. Do not add it to the recipients, and keep a note | |
2170 | that this has happened, in order to give a better error if there are | |
2171 | no recipients left. */ | |
2172 | ||
2173 | else if (recipient != NULL) | |
2174 | { | |
2175 | if (tree_search(tree_nonrecipients, recipient) == NULL) | |
2176 | receive_add_recipient(recipient, -1); | |
2177 | else | |
2178 | extracted_ignored = TRUE; | |
2179 | } | |
2180 | ||
2181 | /* Move on past this address */ | |
2182 | ||
2183 | s = ss + (*ss? 1:0); | |
2184 | while (isspace(*s)) s++; | |
1eccaa59 PH |
2185 | } /* Next address */ |
2186 | ||
2187 | parse_allow_group = FALSE; /* Reset group syntax flags */ | |
2188 | parse_found_group = FALSE; | |
059ec3d9 PH |
2189 | |
2190 | /* If this was the bcc: header, mark it "old", which means it | |
2191 | will be kept on the spool, but not transmitted as part of the | |
2192 | message. */ | |
2193 | ||
2cbb4081 | 2194 | if (h->type == htype_bcc) h->type = htype_old; |
059ec3d9 PH |
2195 | } /* For appropriate header line */ |
2196 | } /* For each header line */ | |
2197 | ||
059ec3d9 PH |
2198 | } |
2199 | ||
2200 | /* Now build the unique message id. This has changed several times over the | |
2201 | lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003). | |
2202 | Retaining all the history in the comment has become too unwieldy - read | |
2203 | previous release sources if you want it. | |
2204 | ||
2205 | The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62. | |
2206 | The first part is the current time, in seconds. The second part is the current | |
2207 | pid. Both are large enough to hold 32-bit numbers in base 62. The third part | |
2208 | can hold a number in the range 0-3843. It used to be a computed sequence | |
2209 | number, but is now the fractional component of the current time in units of | |
2210 | 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been | |
2211 | received, Exim ensures that the timer has ticked at the appropriate level | |
2212 | before proceeding, to avoid duplication if the pid happened to be re-used | |
2213 | within the same time period. It seems likely that most messages will take at | |
2214 | least half a millisecond to be received, so no delay will normally be | |
2215 | necessary. At least for some time... | |
2216 | ||
2217 | There is a modification when localhost_number is set. Formerly this was allowed | |
2218 | to be as large as 255. Now it is restricted to the range 0-16, and the final | |
2219 | component of the message id becomes (localhost_number * 200) + fractional time | |
2220 | in units of 1/200 of a second (i.e. a value in the range 0-3399). | |
2221 | ||
2222 | Some not-really-Unix operating systems use case-insensitive file names (Darwin, | |
2223 | Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this | |
2224 | still allows the tttttt field to hold a large enough number to last for some | |
2225 | more decades, and the final two-digit field can hold numbers up to 1295, which | |
2226 | is enough for milliseconds (instead of 1/2000 of a second). | |
2227 | ||
2228 | However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit | |
2229 | pid, so it is probably safe because pids have to be positive. The | |
2230 | localhost_number is restricted to 0-10 for these hosts, and when it is set, the | |
2231 | final field becomes (localhost_number * 100) + fractional time in centiseconds. | |
2232 | ||
2233 | Note that string_base62() returns its data in a static storage block, so it | |
2234 | must be copied before calling string_base62() again. It always returns exactly | |
2235 | 6 characters. | |
2236 | ||
2237 | There doesn't seem to be anything in the RFC which requires a message id to | |
2238 | start with a letter, but Smail was changed to ensure this. The external form of | |
2239 | the message id (as supplied by string expansion) therefore starts with an | |
2240 | additional leading 'E'. The spool file names do not include this leading | |
2241 | letter and it is not used internally. | |
2242 | ||
2243 | NOTE: If ever the format of message ids is changed, the regular expression for | |
2244 | checking that a string is in this format must be updated in a corresponding | |
2245 | way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH | |
2246 | must also be changed to reflect the correct string length. Then, of course, | |
2247 | other programs that rely on the message id format will need updating too. */ | |
2248 | ||
2249 | Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6); | |
2250 | message_id[6] = '-'; | |
2251 | Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6); | |
2252 | ||
2253 | /* Deal with the case where the host number is set. The value of the number was | |
2254 | checked when it was read, to ensure it isn't too big. The timing granularity is | |
2255 | left in id_resolution so that an appropriate wait can be done after receiving | |
2256 | the message, if necessary (we hope it won't be). */ | |
2257 | ||
2258 | if (host_number_string != NULL) | |
2259 | { | |
2260 | id_resolution = (BASE_62 == 62)? 5000 : 10000; | |
2261 | sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s", | |
2262 | string_base62((long int)( | |
2263 | host_number * (1000000/id_resolution) + | |
2264 | message_id_tv.tv_usec/id_resolution)) + 4); | |
2265 | } | |
2266 | ||
2267 | /* Host number not set: final field is just the fractional time at an | |
2268 | appropriate resolution. */ | |
2269 | ||
2270 | else | |
2271 | { | |
2272 | id_resolution = (BASE_62 == 62)? 500 : 1000; | |
2273 | sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s", | |
2274 | string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4); | |
2275 | } | |
2276 | ||
2277 | /* Add the current message id onto the current process info string if | |
2278 | it will fit. */ | |
2279 | ||
2280 | (void)string_format(process_info + process_info_len, | |
2281 | PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id); | |
2282 | ||
2283 | /* If we are using multiple input directories, set up the one for this message | |
2284 | to be the least significant base-62 digit of the time of arrival. Otherwise | |
2285 | ensure that it is an empty string. */ | |
2286 | ||
2287 | message_subdir[0] = split_spool_directory? message_id[5] : 0; | |
2288 | ||
2289 | /* Now that we have the message-id, if there is no message-id: header, generate | |
8800895a PH |
2290 | one, but only for local (without suppress_local_fixups) or submission mode |
2291 | messages. This can be user-configured if required, but we had better flatten | |
2292 | any illegal characters therein. */ | |
059ec3d9 | 2293 | |
8800895a PH |
2294 | if (msgid_header == NULL && |
2295 | ((sender_host_address == NULL && !suppress_local_fixups) | |
2296 | || submission_mode)) | |
059ec3d9 PH |
2297 | { |
2298 | uschar *p; | |
2299 | uschar *id_text = US""; | |
2300 | uschar *id_domain = primary_hostname; | |
2301 | ||
2302 | /* Permit only letters, digits, dots, and hyphens in the domain */ | |
2303 | ||
2304 | if (message_id_domain != NULL) | |
2305 | { | |
2306 | uschar *new_id_domain = expand_string(message_id_domain); | |
2307 | if (new_id_domain == NULL) | |
2308 | { | |
2309 | if (!expand_string_forcedfail) | |
2310 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2311 | "expansion of \"%s\" (message_id_header_domain) " | |
2312 | "failed: %s", message_id_domain, expand_string_message); | |
2313 | } | |
2314 | else if (*new_id_domain != 0) | |
2315 | { | |
2316 | id_domain = new_id_domain; | |
2317 | for (p = id_domain; *p != 0; p++) | |
2318 | if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */ | |
2319 | } | |
2320 | } | |
2321 | ||
2322 | /* Permit all characters except controls and RFC 2822 specials in the | |
2323 | additional text part. */ | |
2324 | ||
2325 | if (message_id_text != NULL) | |
2326 | { | |
2327 | uschar *new_id_text = expand_string(message_id_text); | |
2328 | if (new_id_text == NULL) | |
2329 | { | |
2330 | if (!expand_string_forcedfail) | |
2331 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2332 | "expansion of \"%s\" (message_id_header_text) " | |
2333 | "failed: %s", message_id_text, expand_string_message); | |
2334 | } | |
2335 | else if (*new_id_text != 0) | |
2336 | { | |
2337 | id_text = new_id_text; | |
2338 | for (p = id_text; *p != 0; p++) | |
2339 | if (mac_iscntrl_or_special(*p)) *p = '-'; | |
2340 | } | |
2341 | } | |
2342 | ||
2343 | /* Add the header line */ | |
2344 | ||
2345 | header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, | |
2346 | message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain); | |
2347 | } | |
2348 | ||
2349 | /* If we are to log recipients, keep a copy of the raw ones before any possible | |
2350 | rewriting. Must copy the count, because later ACLs and the local_scan() | |
2351 | function may mess with the real recipients. */ | |
2352 | ||
2353 | if ((log_extra_selector & LX_received_recipients) != 0) | |
2354 | { | |
2355 | raw_recipients = store_get(recipients_count * sizeof(uschar *)); | |
2356 | for (i = 0; i < recipients_count; i++) | |
2357 | raw_recipients[i] = string_copy(recipients_list[i].address); | |
2358 | raw_recipients_count = recipients_count; | |
2359 | } | |
2360 | ||
2361 | /* Ensure the recipients list is fully qualified and rewritten. Unqualified | |
2362 | recipients will get here only if the conditions were right (allow_unqualified_ | |
2363 | recipient is TRUE). */ | |
2364 | ||
2365 | for (i = 0; i < recipients_count; i++) | |
2366 | recipients_list[i].address = | |
2367 | rewrite_address(recipients_list[i].address, TRUE, TRUE, | |
2368 | global_rewrite_rules, rewrite_existflags); | |
2369 | ||
8800895a PH |
2370 | /* If there is no From: header, generate one for local (without |
2371 | suppress_local_fixups) or submission_mode messages. If there is no sender | |
2372 | address, but the sender is local or this is a local delivery error, use the | |
2373 | originator login. This shouldn't happen for genuine bounces, but might happen | |
2374 | for autoreplies. The addition of From: must be done *before* checking for the | |
2375 | possible addition of a Sender: header, because untrusted_set_sender allows an | |
2376 | untrusted user to set anything in the envelope (which might then get info | |
2377 | From:) but we still want to ensure a valid Sender: if it is required. */ | |
2378 | ||
2379 | if (from_header == NULL && | |
2380 | ((sender_host_address == NULL && !suppress_local_fixups) | |
2381 | || submission_mode)) | |
059ec3d9 | 2382 | { |
2fe1a124 PH |
2383 | uschar *oname = US""; |
2384 | ||
2385 | /* Use the originator_name if this is a locally submitted message and the | |
2386 | caller is not trusted. For trusted callers, use it only if -F was used to | |
2387 | force its value or if we have a non-SMTP message for which -f was not used | |
2388 | to set the sender. */ | |
2389 | ||
2390 | if (sender_host_address == NULL) | |
2391 | { | |
2392 | if (!trusted_caller || sender_name_forced || | |
2393 | (!smtp_input && !sender_address_forced)) | |
2394 | oname = originator_name; | |
2395 | } | |
2396 | ||
2397 | /* For non-locally submitted messages, the only time we use the originator | |
2398 | name is when it was forced by the /name= option on control=submission. */ | |
2399 | ||
2400 | else | |
2401 | { | |
2402 | if (submission_name != NULL) oname = submission_name; | |
2403 | } | |
2404 | ||
059ec3d9 PH |
2405 | /* Envelope sender is empty */ |
2406 | ||
2407 | if (sender_address[0] == 0) | |
2408 | { | |
87ba3f5f PH |
2409 | uschar *fromstart, *fromend; |
2410 | ||
2411 | fromstart = string_sprintf("%sFrom: %s%s", resent_prefix, | |
2fe1a124 PH |
2412 | oname, (oname[0] == 0)? "" : " <"); |
2413 | fromend = (oname[0] == 0)? US"" : US">"; | |
87ba3f5f | 2414 | |
059ec3d9 PH |
2415 | if (sender_local || local_error_message) |
2416 | { | |
87ba3f5f PH |
2417 | header_add(htype_from, "%s%s@%s%s\n", fromstart, |
2418 | local_part_quote(originator_login), qualify_domain_sender, | |
2419 | fromend); | |
059ec3d9 PH |
2420 | } |
2421 | else if (submission_mode && authenticated_id != NULL) | |
2422 | { | |
2423 | if (submission_domain == NULL) | |
2424 | { | |
87ba3f5f PH |
2425 | header_add(htype_from, "%s%s@%s%s\n", fromstart, |
2426 | local_part_quote(authenticated_id), qualify_domain_sender, | |
2427 | fromend); | |
059ec3d9 PH |
2428 | } |
2429 | else if (submission_domain[0] == 0) /* empty => whole address set */ | |
2430 | { | |
87ba3f5f PH |
2431 | header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id, |
2432 | fromend); | |
059ec3d9 PH |
2433 | } |
2434 | else | |
2435 | { | |
87ba3f5f PH |
2436 | header_add(htype_from, "%s%s@%s%s\n", fromstart, |
2437 | local_part_quote(authenticated_id), submission_domain, | |
2438 | fromend); | |
059ec3d9 PH |
2439 | } |
2440 | from_header = header_last; /* To get it checked for Sender: */ | |
2441 | } | |
2442 | } | |
2443 | ||
2444 | /* There is a non-null envelope sender. Build the header using the original | |
2445 | sender address, before any rewriting that might have been done while | |
2446 | verifying it. */ | |
2447 | ||
2448 | else | |
2449 | { | |
87ba3f5f | 2450 | header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix, |
2fe1a124 PH |
2451 | oname, |
2452 | (oname[0] == 0)? "" : " <", | |
87ba3f5f PH |
2453 | (sender_address_unrewritten == NULL)? |
2454 | sender_address : sender_address_unrewritten, | |
2fe1a124 | 2455 | (oname[0] == 0)? "" : ">"); |
059ec3d9 PH |
2456 | |
2457 | from_header = header_last; /* To get it checked for Sender: */ | |
2458 | } | |
2459 | } | |
2460 | ||
2461 | ||
8800895a PH |
2462 | /* If the sender is local (without suppress_local_fixups), or if we are in |
2463 | submission mode and there is an authenticated_id, check that an existing From: | |
2464 | is correct, and if not, generate a Sender: header, unless disabled. Any | |
2465 | previously-existing Sender: header was removed above. Note that sender_local, | |
2466 | as well as being TRUE if the caller of exim is not trusted, is also true if a | |
2467 | trusted caller did not supply a -f argument for non-smtp input. To allow | |
2468 | trusted callers to forge From: without supplying -f, we have to test explicitly | |
2469 | here. If the From: header contains more than one address, then the call to | |
2470 | parse_extract_address fails, and a Sender: header is inserted, as required. */ | |
059ec3d9 PH |
2471 | |
2472 | if (from_header != NULL && | |
69358f02 | 2473 | (active_local_from_check && |
8800895a | 2474 | ((sender_local && !trusted_caller && !suppress_local_fixups) || |
69358f02 | 2475 | (submission_mode && authenticated_id != NULL)) |
059ec3d9 PH |
2476 | )) |
2477 | { | |
2478 | BOOL make_sender = TRUE; | |
2479 | int start, end, domain; | |
2480 | uschar *errmess; | |
2481 | uschar *from_address = | |
2482 | parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess, | |
2483 | &start, &end, &domain, FALSE); | |
2484 | uschar *generated_sender_address; | |
2485 | ||
2486 | if (submission_mode) | |
2487 | { | |
2488 | if (submission_domain == NULL) | |
2489 | { | |
2490 | generated_sender_address = string_sprintf("%s@%s", | |
2491 | local_part_quote(authenticated_id), qualify_domain_sender); | |
2492 | } | |
2493 | else if (submission_domain[0] == 0) /* empty => full address */ | |
2494 | { | |
2495 | generated_sender_address = string_sprintf("%s", | |
2496 | authenticated_id); | |
2497 | } | |
2498 | else | |
2499 | { | |
2500 | generated_sender_address = string_sprintf("%s@%s", | |
2501 | local_part_quote(authenticated_id), submission_domain); | |
2502 | } | |
2503 | } | |
2504 | else | |
2505 | generated_sender_address = string_sprintf("%s@%s", | |
2506 | local_part_quote(originator_login), qualify_domain_sender); | |
2507 | ||
2508 | /* Remove permitted prefixes and suffixes from the local part of the From: | |
2509 | address before doing the comparison with the generated sender. */ | |
2510 | ||
2511 | if (from_address != NULL) | |
2512 | { | |
2513 | int slen; | |
2514 | uschar *at = (domain == 0)? NULL : from_address + domain - 1; | |
2515 | ||
2516 | if (at != NULL) *at = 0; | |
2517 | from_address += route_check_prefix(from_address, local_from_prefix); | |
2518 | slen = route_check_suffix(from_address, local_from_suffix); | |
2519 | if (slen > 0) | |
2520 | { | |
2521 | memmove(from_address+slen, from_address, Ustrlen(from_address)-slen); | |
2522 | from_address += slen; | |
2523 | } | |
2524 | if (at != NULL) *at = '@'; | |
2525 | ||
2526 | if (strcmpic(generated_sender_address, from_address) == 0 || | |
2527 | (domain == 0 && strcmpic(from_address, originator_login) == 0)) | |
2528 | make_sender = FALSE; | |
2529 | } | |
2530 | ||
2531 | /* We have to cause the Sender header to be rewritten if there are | |
2532 | appropriate rewriting rules. */ | |
2533 | ||
2534 | if (make_sender) | |
2535 | { | |
2fe1a124 | 2536 | if (submission_mode && submission_name == NULL) |
059ec3d9 PH |
2537 | header_add(htype_sender, "%sSender: %s\n", resent_prefix, |
2538 | generated_sender_address); | |
2539 | else | |
2540 | header_add(htype_sender, "%sSender: %s <%s>\n", | |
2fe1a124 PH |
2541 | resent_prefix, |
2542 | submission_mode? submission_name : originator_name, | |
2543 | generated_sender_address); | |
059ec3d9 | 2544 | } |
87ba3f5f PH |
2545 | |
2546 | /* Ensure that a non-null envelope sender address corresponds to the | |
2547 | submission mode sender address. */ | |
2548 | ||
2549 | if (submission_mode && sender_address[0] != 0) | |
2550 | { | |
2551 | if (sender_address_unrewritten == NULL) | |
2552 | sender_address_unrewritten = sender_address; | |
2553 | sender_address = generated_sender_address; | |
2554 | log_write(L_address_rewrite, LOG_MAIN, | |
2555 | "\"%s\" from env-from rewritten as \"%s\" by submission mode", | |
2556 | sender_address_unrewritten, generated_sender_address); | |
2557 | } | |
059ec3d9 PH |
2558 | } |
2559 | ||
2560 | ||
2561 | /* If there are any rewriting rules, apply them to the sender address, unless | |
2562 | it has already been rewritten as part of verification for SMTP input. */ | |
2563 | ||
2564 | if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL && | |
2565 | sender_address[0] != 0) | |
2566 | { | |
2567 | sender_address = rewrite_address(sender_address, FALSE, TRUE, | |
2568 | global_rewrite_rules, rewrite_existflags); | |
2569 | DEBUG(D_receive|D_rewrite) | |
2570 | debug_printf("rewritten sender = %s\n", sender_address); | |
2571 | } | |
2572 | ||
2573 | ||
2574 | /* The headers must be run through rewrite_header(), because it ensures that | |
2575 | addresses are fully qualified, as well as applying any rewriting rules that may | |
2576 | exist. | |
2577 | ||
2578 | Qualification of header addresses in a message from a remote host happens only | |
2579 | if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as | |
2580 | appropriate. For local messages, qualification always happens, unless -bnq is | |
2581 | used to explicitly suppress it. No rewriting is done for an unqualified address | |
2582 | that is left untouched. | |
2583 | ||
2584 | We start at the second header, skipping our own Received:. This rewriting is | |
2585 | documented as happening *after* recipient addresses are taken from the headers | |
2586 | by the -t command line option. An added Sender: gets rewritten here. */ | |
2587 | ||
2588 | for (h = header_list->next; h != NULL; h = h->next) | |
2589 | { | |
2590 | header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules, | |
2591 | rewrite_existflags, TRUE); | |
2592 | if (newh != NULL) h = newh; | |
2593 | } | |
2594 | ||
2595 | ||
2596 | /* An RFC 822 (sic) message is not legal unless it has at least one of "to", | |
2cbb4081 | 2597 | "cc", or "bcc". Note that although the minimal examples in RFC 822 show just |
059ec3d9 PH |
2598 | "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header |
2599 | exists, this applies to the set of resent- headers rather than the normal set. | |
2600 | ||
2cbb4081 PH |
2601 | The requirement for a recipient header has been removed in RFC 2822. At this |
2602 | point in the code, earlier versions of Exim added a To: header for locally | |
2603 | submitted messages, and an empty Bcc: header for others. In the light of the | |
2604 | changes in RFC 2822, this was dropped in November 2003. */ | |
059ec3d9 | 2605 | |
059ec3d9 PH |
2606 | |
2607 | /* If there is no date header, generate one if the message originates locally | |
8800895a PH |
2608 | (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the |
2609 | submission mode flag is set. Messages without Date: are not valid, but it seems | |
2610 | to be more confusing if Exim adds one to all remotely-originated messages. */ | |
059ec3d9 | 2611 | |
8800895a PH |
2612 | if (!date_header_exists && |
2613 | ((sender_host_address == NULL && !suppress_local_fixups) | |
2614 | || submission_mode)) | |
059ec3d9 PH |
2615 | header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full)); |
2616 | ||
2617 | search_tidyup(); /* Free any cached resources */ | |
2618 | ||
2619 | /* Show the complete set of headers if debugging. Note that the first one (the | |
2620 | new Received:) has not yet been set. */ | |
2621 | ||
2622 | DEBUG(D_receive) | |
2623 | { | |
2624 | debug_printf(">>Headers after rewriting and local additions:\n"); | |
2625 | for (h = header_list->next; h != NULL; h = h->next) | |
2626 | debug_printf("%c %s", h->type, h->text); | |
2627 | debug_printf("\n"); | |
2628 | } | |
2629 | ||
2630 | /* The headers are now complete in store. If we are running in filter | |
2631 | testing mode, that is all this function does. Return TRUE if the message | |
2632 | ended with a dot. */ | |
2633 | ||
f05da2e8 | 2634 | if (filter_test != FTEST_NONE) |
059ec3d9 PH |
2635 | { |
2636 | process_info[process_info_len] = 0; | |
2637 | return message_ended == END_DOT; | |
2638 | } | |
2639 | ||
2640 | /* Open a new spool file for the data portion of the message. We need | |
2641 | to access it both via a file descriptor and a stream. Try to make the | |
2642 | directory if it isn't there. Note re use of sprintf: spool_directory | |
2643 | is checked on input to be < 200 characters long. */ | |
2644 | ||
2645 | sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir, | |
2646 | message_id); | |
2647 | data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE); | |
2648 | if (data_fd < 0) | |
2649 | { | |
2650 | if (errno == ENOENT) | |
2651 | { | |
2652 | uschar temp[16]; | |
2653 | sprintf(CS temp, "input/%s", message_subdir); | |
2654 | if (message_subdir[0] == 0) temp[5] = 0; | |
2655 | (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE); | |
2656 | data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE); | |
2657 | } | |
2658 | if (data_fd < 0) | |
2659 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s", | |
2660 | spool_name, strerror(errno)); | |
2661 | } | |
2662 | ||
2663 | /* Make sure the file's group is the Exim gid, and double-check the mode | |
2664 | because the group setting doesn't always get set automatically. */ | |
2665 | ||
ff790e47 PH |
2666 | (void)fchown(data_fd, exim_uid, exim_gid); |
2667 | (void)fchmod(data_fd, SPOOL_MODE); | |
059ec3d9 PH |
2668 | |
2669 | /* We now have data file open. Build a stream for it and lock it. We lock only | |
2670 | the first line of the file (containing the message ID) because otherwise there | |
2671 | are problems when Exim is run under Cygwin (I'm told). See comments in | |
2672 | spool_in.c, where the same locking is done. */ | |
2673 | ||
2674 | data_file = fdopen(data_fd, "w+"); | |
2675 | lock_data.l_type = F_WRLCK; | |
2676 | lock_data.l_whence = SEEK_SET; | |
2677 | lock_data.l_start = 0; | |
2678 | lock_data.l_len = SPOOL_DATA_START_OFFSET; | |
2679 | ||
2680 | if (fcntl(data_fd, F_SETLK, &lock_data) < 0) | |
2681 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name, | |
2682 | errno, strerror(errno)); | |
2683 | ||
2684 | /* We have an open, locked data file. Write the message id to it to make it | |
2685 | self-identifying. Then read the remainder of the input of this message and | |
2686 | write it to the data file. If the variable next != NULL, it contains the first | |
2687 | data line (which was read as a header but then turned out not to have the right | |
2688 | format); write it (remembering that it might contain binary zeros). The result | |
2689 | of fwrite() isn't inspected; instead we call ferror() below. */ | |
2690 | ||
2691 | fprintf(data_file, "%s-D\n", message_id); | |
2692 | if (next != NULL) | |
2693 | { | |
2694 | uschar *s = next->text; | |
2695 | int len = next->slen; | |
f1e894f3 | 2696 | (void)fwrite(s, 1, len, data_file); |
059ec3d9 PH |
2697 | body_linecount++; /* Assumes only 1 line */ |
2698 | } | |
2699 | ||
2700 | /* Note that we might already be at end of file, or the logical end of file | |
2701 | (indicated by '.'), or might have encountered an error while writing the | |
2702 | message id or "next" line. */ | |
2703 | ||
2704 | if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT) | |
2705 | { | |
2706 | if (smtp_input) | |
2707 | { | |
2708 | message_ended = read_message_data_smtp(data_file); | |
2709 | receive_linecount++; /* The terminating "." line */ | |
2710 | } | |
2711 | else message_ended = read_message_data(data_file); | |
2712 | ||
2713 | receive_linecount += body_linecount; /* For BSMTP errors mainly */ | |
2e0c1448 | 2714 | message_linecount += body_linecount; |
059ec3d9 PH |
2715 | |
2716 | /* Handle premature termination of SMTP */ | |
2717 | ||
2718 | if (smtp_input && message_ended == END_EOF) | |
2719 | { | |
2720 | Uunlink(spool_name); /* Lose data file when closed */ | |
2721 | message_id[0] = 0; /* Indicate no message accepted */ | |
2722 | smtp_reply = handle_lost_connection(US""); | |
2723 | smtp_yield = FALSE; | |
2724 | goto TIDYUP; /* Skip to end of function */ | |
2725 | } | |
2726 | ||
2727 | /* Handle message that is too big. Don't use host_or_ident() in the log | |
2728 | message; we want to see the ident value even for non-remote messages. */ | |
2729 | ||
2730 | if (message_ended == END_SIZE) | |
2731 | { | |
2732 | Uunlink(spool_name); /* Lose the data file when closed */ | |
2733 | if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */ | |
2734 | ||
2735 | log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: " | |
2736 | "message too big: read=%d max=%d", | |
2737 | sender_address, | |
2738 | (sender_fullhost == NULL)? "" : " H=", | |
2739 | (sender_fullhost == NULL)? US"" : sender_fullhost, | |
2740 | (sender_ident == NULL)? "" : " U=", | |
2741 | (sender_ident == NULL)? US"" : sender_ident, | |
2742 | message_size, | |
2743 | thismessage_size_limit); | |
2744 | ||
2745 | if (smtp_input) | |
2746 | { | |
2747 | smtp_reply = US"552 Message size exceeds maximum permitted"; | |
2748 | message_id[0] = 0; /* Indicate no message accepted */ | |
2749 | goto TIDYUP; /* Skip to end of function */ | |
2750 | } | |
2751 | else | |
2752 | { | |
2753 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
2754 | give_local_error(ERRMESS_TOOBIG, | |
2755 | string_sprintf("message too big (max=%d)", thismessage_size_limit), | |
2756 | US"message rejected: ", error_rc, data_file, header_list); | |
2757 | /* Does not return */ | |
2758 | } | |
2759 | } | |
2760 | } | |
2761 | ||
2762 | /* Restore the standard SIGALRM handler for any subsequent processing. (For | |
2763 | example, there may be some expansion in an ACL that uses a timer.) */ | |
2764 | ||
2765 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
2766 | ||
2767 | /* The message body has now been read into the data file. Call fflush() to | |
2768 | empty the buffers in C, and then call fsync() to get the data written out onto | |
2769 | the disk, as fflush() doesn't do this (or at least, it isn't documented as | |
2770 | having to do this). If there was an I/O error on either input or output, | |
2771 | attempt to send an error message, and unlink the spool file. For non-SMTP input | |
2772 | we can then give up. Note that for SMTP input we must swallow the remainder of | |
2773 | the input in cases of output errors, since the far end doesn't expect to see | |
2774 | anything until the terminating dot line is sent. */ | |
2775 | ||
2776 | if (fflush(data_file) == EOF || ferror(data_file) || | |
54fc8428 | 2777 | EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)()) |
059ec3d9 PH |
2778 | { |
2779 | uschar *msg_errno = US strerror(errno); | |
2780 | BOOL input_error = (receive_ferror)() != 0; | |
2781 | uschar *msg = string_sprintf("%s error (%s) while receiving message from %s", | |
2782 | input_error? "Input read" : "Spool write", | |
2783 | msg_errno, | |
2784 | (sender_fullhost != NULL)? sender_fullhost : sender_ident); | |
2785 | ||
2786 | log_write(0, LOG_MAIN, "Message abandoned: %s", msg); | |
2787 | Uunlink(spool_name); /* Lose the data file */ | |
2788 | ||
2789 | if (smtp_input) | |
2790 | { | |
2791 | if (input_error) | |
2792 | smtp_reply = US"451 Error while reading input data"; | |
2793 | else | |
2794 | { | |
2795 | smtp_reply = US"451 Error while writing spool file"; | |
2796 | receive_swallow_smtp(); | |
2797 | } | |
2798 | message_id[0] = 0; /* Indicate no message accepted */ | |
2799 | goto TIDYUP; /* Skip to end of function */ | |
2800 | } | |
2801 | ||
2802 | else | |
2803 | { | |
2804 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
2805 | give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file, | |
2806 | header_list); | |
2807 | /* Does not return */ | |
2808 | } | |
2809 | } | |
2810 | ||
2811 | ||
2812 | /* No I/O errors were encountered while writing the data file. */ | |
2813 | ||
2814 | DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id); | |
2815 | ||
2816 | ||
2817 | /* If there were any bad addresses extracted by -t, or there were no recipients | |
2818 | left after -t, send a message to the sender of this message, or write it to | |
2819 | stderr if the error handling option is set that way. Note that there may | |
2820 | legitimately be no recipients for an SMTP message if they have all been removed | |
2821 | by "discard". | |
2822 | ||
2823 | We need to rewind the data file in order to read it. In the case of no | |
2824 | recipients or stderr error writing, throw the data file away afterwards, and | |
2825 | exit. (This can't be SMTP, which always ensures there's at least one | |
2826 | syntactically good recipient address.) */ | |
2827 | ||
2828 | if (extract_recip && (bad_addresses != NULL || recipients_count == 0)) | |
2829 | { | |
2830 | DEBUG(D_receive) | |
2831 | { | |
2832 | if (recipients_count == 0) debug_printf("*** No recipients\n"); | |
2833 | if (bad_addresses != NULL) | |
2834 | { | |
2835 | error_block *eblock = bad_addresses; | |
2836 | debug_printf("*** Bad address(es)\n"); | |
2837 | while (eblock != NULL) | |
2838 | { | |
2839 | debug_printf(" %s: %s\n", eblock->text1, eblock->text2); | |
2840 | eblock = eblock->next; | |
2841 | } | |
2842 | } | |
2843 | } | |
2844 | ||
2845 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
2846 | ||
2847 | /* If configured to send errors to the sender, but this fails, force | |
2848 | a failure error code. We use a special one for no recipients so that it | |
2849 | can be detected by the autoreply transport. Otherwise error_rc is set to | |
2850 | errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case | |
2851 | it is EXIT_SUCCESS. */ | |
2852 | ||
2853 | if (error_handling == ERRORS_SENDER) | |
2854 | { | |
2855 | if (!moan_to_sender( | |
2856 | (bad_addresses == NULL)? | |
2857 | (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) : | |
2858 | (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS, | |
2859 | bad_addresses, header_list, data_file, FALSE)) | |
2860 | error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE; | |
2861 | } | |
2862 | else | |
2863 | { | |
2864 | if (bad_addresses == NULL) | |
2865 | { | |
2866 | if (extracted_ignored) | |
2867 | fprintf(stderr, "exim: all -t recipients overridden by command line\n"); | |
2868 | else | |
2869 | fprintf(stderr, "exim: no recipients in message\n"); | |
2870 | } | |
2871 | else | |
2872 | { | |
2873 | fprintf(stderr, "exim: invalid address%s", | |
2874 | (bad_addresses->next == NULL)? ":" : "es:\n"); | |
2875 | while (bad_addresses != NULL) | |
2876 | { | |
2877 | fprintf(stderr, " %s: %s\n", bad_addresses->text1, | |
2878 | bad_addresses->text2); | |
2879 | bad_addresses = bad_addresses->next; | |
2880 | } | |
2881 | } | |
2882 | } | |
2883 | ||
2884 | if (recipients_count == 0 || error_handling == ERRORS_STDERR) | |
2885 | { | |
2886 | Uunlink(spool_name); | |
f1e894f3 | 2887 | (void)fclose(data_file); |
059ec3d9 PH |
2888 | exim_exit(error_rc); |
2889 | } | |
2890 | } | |
2891 | ||
2892 | /* Data file successfully written. Generate text for the Received: header by | |
2893 | expanding the configured string, and adding a timestamp. By leaving this | |
2894 | operation till now, we ensure that the timestamp is the time that message | |
2895 | reception was completed. However, this is deliberately done before calling the | |
2896 | data ACL and local_scan(). | |
2897 | ||
2898 | This Received: header may therefore be inspected by the data ACL and by code in | |
2899 | the local_scan() function. When they have run, we update the timestamp to be | |
2900 | the final time of reception. | |
2901 | ||
2902 | If there is just one recipient, set up its value in the $received_for variable | |
2903 | for use when we generate the Received: header. | |
2904 | ||
2905 | Note: the checking for too many Received: headers is handled by the delivery | |
2906 | code. */ | |
2907 | ||
2908 | timestamp = expand_string(US"${tod_full}"); | |
2909 | if (recipients_count == 1) received_for = recipients_list[0].address; | |
2910 | received = expand_string(received_header_text); | |
2911 | received_for = NULL; | |
2912 | ||
2913 | if (received == NULL) | |
2914 | { | |
2915 | Uunlink(spool_name); /* Lose the data file */ | |
2916 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" " | |
2917 | "(received_header_text) failed: %s", string_printing(received_header_text), | |
2918 | expand_string_message); | |
2919 | } | |
2920 | ||
2921 | /* The first element on the header chain is reserved for the Received header, | |
2922 | so all we have to do is fill in the text pointer, and set the type. However, if | |
2923 | the result of the expansion is an empty string, we leave the header marked as | |
2924 | "old" so as to refrain from adding a Received header. */ | |
2925 | ||
2926 | if (received[0] == 0) | |
2927 | { | |
2928 | received_header->text = string_sprintf("Received: ; %s\n", timestamp); | |
2929 | received_header->type = htype_old; | |
2930 | } | |
2931 | else | |
2932 | { | |
2933 | received_header->text = string_sprintf("%s; %s\n", received, timestamp); | |
2934 | received_header->type = htype_received; | |
2935 | } | |
2936 | ||
2937 | received_header->slen = Ustrlen(received_header->text); | |
2938 | ||
2939 | DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s", | |
2940 | received_header->type, received_header->text); | |
2941 | ||
2942 | /* Set the value of message_body_size for the DATA ACL and for local_scan() */ | |
2943 | ||
2944 | message_body_size = (fstat(data_fd, &statbuf) == 0)? | |
2945 | statbuf.st_size - SPOOL_DATA_START_OFFSET : -1; | |
2946 | ||
2947 | /* If an ACL from any RCPT commands set up any warning headers to add, do so | |
2948 | now, before running the DATA ACL. */ | |
2949 | ||
2950 | add_acl_headers(US"MAIL or RCPT"); | |
2951 | ||
2952 | /* If an ACL is specified for checking things at this stage of reception of a | |
2953 | message, run it, unless all the recipients were removed by "discard" in earlier | |
2954 | ACLs. That is the only case in which recipients_count can be zero at this | |
2955 | stage. Set deliver_datafile to point to the data file so that $message_body and | |
2956 | $message_body_end can be extracted if needed. Allow $recipients in expansions. | |
2957 | */ | |
2958 | ||
2959 | deliver_datafile = data_fd; | |
4e88a19f | 2960 | user_msg = NULL; |
059ec3d9 | 2961 | |
0e20aff9 MH |
2962 | enable_dollar_recipients = TRUE; |
2963 | ||
059ec3d9 PH |
2964 | if (recipients_count == 0) |
2965 | { | |
2966 | blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL"; | |
2967 | } | |
2968 | else | |
2969 | { | |
059ec3d9 PH |
2970 | /* Handle interactive SMTP messages */ |
2971 | ||
2972 | if (smtp_input && !smtp_batched_input) | |
2973 | { | |
8523533c | 2974 | |
fb2274d4 TK |
2975 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2976 | dk_exim_verify_finish(); | |
2977 | #endif | |
2978 | ||
8523533c | 2979 | #ifdef WITH_CONTENT_SCAN |
54cdb463 PH |
2980 | if (acl_smtp_mime != NULL && |
2981 | !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)) | |
2982 | goto TIDYUP; | |
8523533c TK |
2983 | #endif /* WITH_CONTENT_SCAN */ |
2984 | ||
54cdb463 PH |
2985 | /* Check the recipients count again, as the MIME ACL might have changed |
2986 | them. */ | |
8523533c | 2987 | |
059ec3d9 PH |
2988 | if (acl_smtp_data != NULL && recipients_count > 0) |
2989 | { | |
059ec3d9 PH |
2990 | rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg); |
2991 | add_acl_headers(US"DATA"); | |
2992 | if (rc == DISCARD) | |
2993 | { | |
2994 | recipients_count = 0; | |
2995 | blackholed_by = US"DATA ACL"; | |
8e669ac1 PH |
2996 | if (log_msg != NULL) |
2997 | blackhole_log_msg = string_sprintf(": %s", log_msg); | |
059ec3d9 PH |
2998 | } |
2999 | else if (rc != OK) | |
3000 | { | |
3001 | Uunlink(spool_name); | |
8523533c TK |
3002 | #ifdef WITH_CONTENT_SCAN |
3003 | unspool_mbox(); | |
3004 | #endif | |
059ec3d9 PH |
3005 | if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0) |
3006 | smtp_yield = FALSE; /* No more messsages after dropped connection */ | |
3007 | smtp_reply = US""; /* Indicate reply already sent */ | |
3008 | message_id[0] = 0; /* Indicate no message accepted */ | |
3009 | goto TIDYUP; /* Skip to end of function */ | |
3010 | } | |
3011 | } | |
3012 | } | |
3013 | ||
3014 | /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that | |
3015 | we cannot take different actions for permanent and temporary rejections. */ | |
3016 | ||
54cdb463 | 3017 | else |
059ec3d9 | 3018 | { |
54cdb463 PH |
3019 | |
3020 | #ifdef WITH_CONTENT_SCAN | |
3021 | if (acl_not_smtp_mime != NULL && | |
3022 | !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply, | |
3023 | &blackholed_by)) | |
3024 | goto TIDYUP; | |
3025 | #endif /* WITH_CONTENT_SCAN */ | |
3026 | ||
3027 | if (acl_not_smtp != NULL) | |
059ec3d9 | 3028 | { |
54cdb463 PH |
3029 | uschar *user_msg, *log_msg; |
3030 | rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg); | |
3031 | if (rc == DISCARD) | |
059ec3d9 | 3032 | { |
54cdb463 PH |
3033 | recipients_count = 0; |
3034 | blackholed_by = US"non-SMTP ACL"; | |
3035 | if (log_msg != NULL) | |
3036 | blackhole_log_msg = string_sprintf(": %s", log_msg); | |
059ec3d9 | 3037 | } |
54cdb463 | 3038 | else if (rc != OK) |
059ec3d9 | 3039 | { |
54cdb463 PH |
3040 | Uunlink(spool_name); |
3041 | #ifdef WITH_CONTENT_SCAN | |
3042 | unspool_mbox(); | |
3043 | #endif | |
6ea85e9a PH |
3044 | /* The ACL can specify where rejections are to be logged, possibly |
3045 | nowhere. The default is main and reject logs. */ | |
3046 | ||
3047 | if (log_reject_target != 0) | |
3048 | log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s", | |
3049 | sender_address, log_msg); | |
3050 | ||
54cdb463 PH |
3051 | if (user_msg == NULL) user_msg = US"local configuration problem"; |
3052 | if (smtp_batched_input) | |
3053 | { | |
3054 | moan_smtp_batch(NULL, "%d %s", 550, user_msg); | |
3055 | /* Does not return */ | |
3056 | } | |
3057 | else | |
3058 | { | |
3059 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
3060 | give_local_error(ERRMESS_LOCAL_ACL, user_msg, | |
3061 | US"message rejected by non-SMTP ACL: ", error_rc, data_file, | |
3062 | header_list); | |
3063 | /* Does not return */ | |
3064 | } | |
059ec3d9 | 3065 | } |
54cdb463 | 3066 | add_acl_headers(US"non-SMTP"); |
059ec3d9 | 3067 | } |
059ec3d9 PH |
3068 | } |
3069 | ||
54cdb463 PH |
3070 | /* The applicable ACLs have been run */ |
3071 | ||
059ec3d9 PH |
3072 | if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */ |
3073 | if (queue_only_policy) queued_by = US"ACL"; | |
059ec3d9 PH |
3074 | } |
3075 | ||
8523533c TK |
3076 | #ifdef WITH_CONTENT_SCAN |
3077 | unspool_mbox(); | |
3078 | #endif | |
3079 | ||
059ec3d9 PH |
3080 | /* The final check on the message is to run the scan_local() function. The |
3081 | version supplied with Exim always accepts, but this is a hook for sysadmins to | |
3082 | supply their own checking code. The local_scan() function is run even when all | |
3083 | the recipients have been discarded. */ | |
3084 | ||
3085 | lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
3086 | ||
3087 | /* Arrange to catch crashes in local_scan(), so that the -D file gets | |
3088 | deleted, and the incident gets logged. */ | |
3089 | ||
3090 | os_non_restarting_signal(SIGSEGV, local_scan_crash_handler); | |
3091 | os_non_restarting_signal(SIGFPE, local_scan_crash_handler); | |
3092 | os_non_restarting_signal(SIGILL, local_scan_crash_handler); | |
3093 | os_non_restarting_signal(SIGBUS, local_scan_crash_handler); | |
3094 | ||
3095 | DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n", | |
3096 | local_scan_timeout); | |
3097 | local_scan_data = NULL; | |
3098 | ||
3099 | os_non_restarting_signal(SIGALRM, local_scan_timeout_handler); | |
3100 | if (local_scan_timeout > 0) alarm(local_scan_timeout); | |
3101 | rc = local_scan(data_fd, &local_scan_data); | |
3102 | alarm(0); | |
3103 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
3104 | ||
0e20aff9 MH |
3105 | enable_dollar_recipients = FALSE; |
3106 | ||
059ec3d9 PH |
3107 | store_pool = POOL_MAIN; /* In case changed */ |
3108 | DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc, | |
3109 | local_scan_data); | |
3110 | ||
3111 | os_non_restarting_signal(SIGSEGV, SIG_DFL); | |
3112 | os_non_restarting_signal(SIGFPE, SIG_DFL); | |
3113 | os_non_restarting_signal(SIGILL, SIG_DFL); | |
3114 | os_non_restarting_signal(SIGBUS, SIG_DFL); | |
3115 | ||
3116 | /* The length check is paranoia against some runaway code, and also because | |
3117 | (for a success return) lines in the spool file are read into big_buffer. */ | |
3118 | ||
3119 | if (local_scan_data != NULL) | |
3120 | { | |
3121 | int len = Ustrlen(local_scan_data); | |
3122 | if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN; | |
3123 | local_scan_data = string_copyn(local_scan_data, len); | |
3124 | } | |
3125 | ||
3126 | if (rc == LOCAL_SCAN_ACCEPT_FREEZE) | |
3127 | { | |
58eb016e | 3128 | if (!deliver_freeze) /* ACL might have already frozen */ |
059ec3d9 PH |
3129 | { |
3130 | deliver_freeze = TRUE; | |
3131 | deliver_frozen_at = time(NULL); | |
3132 | frozen_by = US"local_scan()"; | |
3133 | } | |
3134 | rc = LOCAL_SCAN_ACCEPT; | |
3135 | } | |
3136 | else if (rc == LOCAL_SCAN_ACCEPT_QUEUE) | |
3137 | { | |
3138 | if (!queue_only_policy) /* ACL might have already queued */ | |
3139 | { | |
3140 | queue_only_policy = TRUE; | |
3141 | queued_by = US"local_scan()"; | |
3142 | } | |
3143 | rc = LOCAL_SCAN_ACCEPT; | |
3144 | } | |
3145 | ||
3146 | /* Message accepted: remove newlines in local_scan_data because otherwise | |
3147 | the spool file gets corrupted. Ensure that all recipients are qualified. */ | |
3148 | ||
3149 | if (rc == LOCAL_SCAN_ACCEPT) | |
3150 | { | |
3151 | if (local_scan_data != NULL) | |
3152 | { | |
3153 | uschar *s; | |
3154 | for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' '; | |
3155 | } | |
3156 | for (i = 0; i < recipients_count; i++) | |
3157 | { | |
3158 | recipient_item *r = recipients_list + i; | |
3159 | r->address = rewrite_address_qualify(r->address, TRUE); | |
3160 | if (r->errors_to != NULL) | |
3161 | r->errors_to = rewrite_address_qualify(r->errors_to, TRUE); | |
3162 | } | |
3163 | if (recipients_count == 0 && blackholed_by == NULL) | |
3164 | blackholed_by = US"local_scan"; | |
3165 | } | |
3166 | ||
3167 | /* Message rejected: newlines permitted in local_scan_data to generate | |
3168 | multiline SMTP responses. */ | |
3169 | ||
3170 | else | |
3171 | { | |
3172 | uschar *istemp = US""; | |
3173 | uschar *s = NULL; | |
a5bd321b | 3174 | uschar *smtp_code; |
059ec3d9 PH |
3175 | int size = 0; |
3176 | int sptr = 0; | |
059ec3d9 PH |
3177 | |
3178 | errmsg = local_scan_data; | |
3179 | ||
3180 | Uunlink(spool_name); /* Cancel this message */ | |
3181 | switch(rc) | |
3182 | { | |
3183 | default: | |
3184 | log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary " | |
3185 | "rejection given", rc); | |
3186 | goto TEMPREJECT; | |
3187 | ||
3188 | case LOCAL_SCAN_REJECT_NOLOGHDR: | |
3189 | log_extra_selector &= ~LX_rejected_header; | |
3190 | /* Fall through */ | |
3191 | ||
3192 | case LOCAL_SCAN_REJECT: | |
a5bd321b | 3193 | smtp_code = US"550"; |
059ec3d9 PH |
3194 | if (errmsg == NULL) errmsg = US"Administrative prohibition"; |
3195 | break; | |
3196 | ||
3197 | case LOCAL_SCAN_TEMPREJECT_NOLOGHDR: | |
3198 | log_extra_selector &= ~LX_rejected_header; | |
3199 | /* Fall through */ | |
3200 | ||
3201 | case LOCAL_SCAN_TEMPREJECT: | |
3202 | TEMPREJECT: | |
a5bd321b | 3203 | smtp_code = US"451"; |
059ec3d9 PH |
3204 | if (errmsg == NULL) errmsg = US"Temporary local problem"; |
3205 | istemp = US"temporarily "; | |
3206 | break; | |
3207 | } | |
3208 | ||
3209 | s = string_append(s, &size, &sptr, 2, US"F=", | |
3210 | (sender_address[0] == 0)? US"<>" : sender_address); | |
3211 | s = add_host_info_for_log(s, &size, &sptr); | |
3212 | s[sptr] = 0; | |
3213 | ||
3214 | log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s", | |
3215 | s, istemp, string_printing(errmsg)); | |
3216 | ||
3217 | if (smtp_input) | |
3218 | { | |
3219 | if (!smtp_batched_input) | |
3220 | { | |
a5bd321b | 3221 | smtp_respond(smtp_code, 3, TRUE, errmsg); |
059ec3d9 PH |
3222 | message_id[0] = 0; /* Indicate no message accepted */ |
3223 | smtp_reply = US""; /* Indicate reply already sent */ | |
3224 | goto TIDYUP; /* Skip to end of function */ | |
3225 | } | |
3226 | else | |
3227 | { | |
a5bd321b | 3228 | moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg); |
059ec3d9 PH |
3229 | /* Does not return */ |
3230 | } | |
3231 | } | |
3232 | else | |
3233 | { | |
3234 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
3235 | give_local_error(ERRMESS_LOCAL_SCAN, errmsg, | |
3236 | US"message rejected by local scan code: ", error_rc, data_file, | |
3237 | header_list); | |
3238 | /* Does not return */ | |
3239 | } | |
3240 | } | |
3241 | ||
3242 | /* Reset signal handlers to ignore signals that previously would have caused | |
3243 | the message to be abandoned. */ | |
3244 | ||
3245 | signal(SIGTERM, SIG_IGN); | |
3246 | signal(SIGINT, SIG_IGN); | |
3247 | ||
3248 | /* Ensure the first time flag is set in the newly-received message. */ | |
3249 | ||
3250 | deliver_firsttime = TRUE; | |
3251 | ||
8523533c TK |
3252 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3253 | if (bmi_run == 1) { | |
3254 | /* rewind data file */ | |
3255 | lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
3256 | bmi_verdicts = bmi_process_message(header_list, data_fd); | |
3257 | }; | |
3258 | #endif | |
3259 | ||
059ec3d9 PH |
3260 | /* Update the timstamp in our Received: header to account for any time taken by |
3261 | an ACL or by local_scan(). The new time is the time that all reception | |
3262 | processing is complete. */ | |
3263 | ||
3264 | timestamp = expand_string(US"${tod_full}"); | |
3265 | tslen = Ustrlen(timestamp); | |
3266 | ||
3267 | memcpy(received_header->text + received_header->slen - tslen - 1, | |
3268 | timestamp, tslen); | |
3269 | ||
3270 | /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */ | |
3271 | ||
3272 | if (mua_wrapper) | |
3273 | { | |
3274 | deliver_freeze = FALSE; | |
3275 | queue_only_policy = FALSE; | |
3276 | } | |
3277 | ||
3278 | /* Keep the data file open until we have written the header file, in order to | |
3279 | hold onto the lock. In a -bh run, or if the message is to be blackholed, we | |
3280 | don't write the header file, and we unlink the data file. If writing the header | |
3281 | file fails, we have failed to accept this message. */ | |
3282 | ||
3283 | if (host_checking || blackholed_by != NULL) | |
3284 | { | |
3285 | header_line *h; | |
3286 | Uunlink(spool_name); | |
3287 | msg_size = 0; /* Compute size for log line */ | |
3288 | for (h = header_list; h != NULL; h = h->next) | |
3289 | if (h->type != '*') msg_size += h->slen; | |
3290 | } | |
3291 | ||
3292 | /* Write the -H file */ | |
3293 | ||
3294 | else | |
3295 | { | |
3296 | if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0) | |
3297 | { | |
3298 | log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg); | |
3299 | Uunlink(spool_name); /* Lose the data file */ | |
3300 | ||
3301 | if (smtp_input) | |
3302 | { | |
3303 | smtp_reply = US"451 Error in writing spool file"; | |
3304 | message_id[0] = 0; /* Indicate no message accepted */ | |
3305 | goto TIDYUP; | |
3306 | } | |
3307 | else | |
3308 | { | |
3309 | fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET); | |
3310 | give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file, | |
3311 | header_list); | |
3312 | /* Does not return */ | |
3313 | } | |
3314 | } | |
3315 | } | |
3316 | ||
3317 | ||
3318 | /* The message has now been successfully received. */ | |
3319 | ||
3320 | receive_messagecount++; | |
3321 | ||
3322 | /* In SMTP sessions we may receive several in one connection. After each one, | |
3323 | we wait for the clock to tick at the level of message-id granularity. This is | |
3324 | so that the combination of time+pid is unique, even on systems where the pid | |
3325 | can be re-used within our time interval. We can't shorten the interval without | |
3326 | re-designing the message-id. See comments above where the message id is | |
3327 | created. This is Something For The Future. */ | |
3328 | ||
3329 | message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution; | |
3330 | exim_wait_tick(&message_id_tv, id_resolution); | |
3331 | ||
3332 | /* Add data size to written header size. We do not count the initial file name | |
3333 | that is in the file, but we do add one extra for the notional blank line that | |
3334 | precedes the data. This total differs from message_size in that it include the | |
3335 | added Received: header and any other headers that got created locally. */ | |
3336 | ||
3337 | fflush(data_file); | |
3338 | fstat(data_fd, &statbuf); | |
3339 | ||
3340 | msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1; | |
3341 | ||
3342 | /* Generate a "message received" log entry. We do this by building up a dynamic | |
3343 | string as required. Since we commonly want to add two items at a time, use a | |
3344 | macro to simplify the coding. We log the arrival of a new message while the | |
3345 | file is still locked, just in case the machine is *really* fast, and delivers | |
3346 | it first! Include any message id that is in the message - since the syntax of a | |
3347 | message id is actually an addr-spec, we can use the parse routine to canonicize | |
3348 | it. */ | |
3349 | ||
3350 | size = 256; | |
3351 | sptr = 0; | |
3352 | s = store_get(size); | |
3353 | ||
3354 | s = string_append(s, &size, &sptr, 2, US"<= ", | |
3355 | (sender_address[0] == 0)? US"<>" : sender_address); | |
3356 | if (message_reference != NULL) | |
3357 | s = string_append(s, &size, &sptr, 2, US" R=", message_reference); | |
3358 | ||
3359 | s = add_host_info_for_log(s, &size, &sptr); | |
3360 | ||
3361 | #ifdef SUPPORT_TLS | |
3362 | if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL) | |
3363 | s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher); | |
3364 | if ((log_extra_selector & LX_tls_certificate_verified) != 0 && | |
3365 | tls_cipher != NULL) | |
3366 | s = string_append(s, &size, &sptr, 2, US" CV=", | |
3367 | tls_certificate_verified? "yes":"no"); | |
3368 | if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL) | |
3369 | s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\""); | |
3370 | #endif | |
3371 | ||
3372 | if (sender_host_authenticated != NULL) | |
3373 | { | |
3374 | s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated); | |
3375 | if (authenticated_id != NULL) | |
3376 | s = string_append(s, &size, &sptr, 2, US":", authenticated_id); | |
3377 | } | |
3378 | ||
3379 | sprintf(CS big_buffer, "%d", msg_size); | |
3380 | s = string_append(s, &size, &sptr, 2, US" S=", big_buffer); | |
3381 | ||
3382 | /* If an addr-spec in a message-id contains a quoted string, it can contain | |
3383 | any characters except " \ and CR and so in particular it can contain NL! | |
3384 | Therefore, make sure we use a printing-characters only version for the log. | |
3385 | Also, allow for domain literals in the message id. */ | |
3386 | ||
3387 | if (msgid_header != NULL) | |
3388 | { | |
3389 | uschar *old_id; | |
3390 | BOOL save_allow_domain_literals = allow_domain_literals; | |
3391 | allow_domain_literals = TRUE; | |
3392 | old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1, | |
3393 | &errmsg, &start, &end, &domain, FALSE); | |
3394 | allow_domain_literals = save_allow_domain_literals; | |
3395 | if (old_id != NULL) | |
3396 | s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id)); | |
3397 | } | |
3398 | ||
3399 | /* If subject logging is turned on, create suitable printing-character | |
3400 | text. By expanding $h_subject: we make use of the MIME decoding. */ | |
3401 | ||
3402 | if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL) | |
3403 | { | |
3404 | int i; | |
3405 | uschar *p = big_buffer; | |
3406 | uschar *ss = expand_string(US"$h_subject:"); | |
3407 | ||
3408 | /* Backslash-quote any double quotes or backslashes so as to make a | |
3409 | a C-like string, and turn any non-printers into escape sequences. */ | |
3410 | ||
3411 | *p++ = '\"'; | |
3412 | if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++) | |
3413 | { | |
3414 | if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\'; | |
3415 | *p++ = ss[i]; | |
3416 | } | |
3417 | *p++ = '\"'; | |
3418 | *p = 0; | |
3419 | s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer)); | |
3420 | } | |
3421 | ||
3422 | /* Terminate the string: string_cat() and string_append() leave room, but do | |
3423 | not put the zero in. */ | |
3424 | ||
3425 | s[sptr] = 0; | |
3426 | ||
059ec3d9 PH |
3427 | /* Create a message log file if message logs are being used and this message is |
3428 | not blackholed. Write the reception stuff to it. We used to leave message log | |
3429 | creation until the first delivery, but this has proved confusing for somep | |
3430 | people. */ | |
3431 | ||
3432 | if (message_logs && blackholed_by == NULL) | |
3433 | { | |
3434 | int fd; | |
3435 | ||
3436 | sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir, | |
3437 | message_id); | |
3438 | fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE); | |
3439 | ||
3440 | if (fd < 0 && errno == ENOENT) | |
3441 | { | |
3442 | uschar temp[16]; | |
3443 | sprintf(CS temp, "msglog/%s", message_subdir); | |
3444 | if (message_subdir[0] == 0) temp[6] = 0; | |
3445 | (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE); | |
3446 | fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE); | |
3447 | } | |
3448 | ||
3449 | if (fd < 0) | |
3450 | { | |
3451 | log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s", | |
3452 | spool_name, strerror(errno)); | |
3453 | } | |
3454 | ||
3455 | else | |
3456 | { | |
3457 | FILE *message_log = fdopen(fd, "a"); | |
3458 | if (message_log == NULL) | |
3459 | { | |
3460 | log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s", | |
3461 | spool_name, strerror(errno)); | |
f1e894f3 | 3462 | (void)close(fd); |
059ec3d9 PH |
3463 | } |
3464 | else | |
3465 | { | |
3466 | uschar *now = tod_stamp(tod_log); | |
3467 | fprintf(message_log, "%s Received from %s\n", now, s+3); | |
3468 | if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now, | |
3469 | frozen_by); | |
3470 | if (queue_only_policy) fprintf(message_log, | |
3471 | "%s no immediate delivery: queued by %s\n", now, queued_by); | |
f1e894f3 | 3472 | (void)fclose(message_log); |
059ec3d9 PH |
3473 | } |
3474 | } | |
3475 | } | |
3476 | ||
58eb016e PH |
3477 | /* Everything has now been done for a successful message except logging its |
3478 | arrival, and outputting an SMTP response. While writing to the log, set a flag | |
3479 | to cause a call to receive_bomb_out() if the log cannot be opened. */ | |
3480 | ||
3481 | receive_call_bombout = TRUE; | |
3482 | ||
563b63fa PH |
3483 | /* Before sending an SMTP response in a TCP/IP session, we check to see if the |
3484 | connection has gone away. This can only be done if there is no unconsumed input | |
3485 | waiting in the local input buffer. We can test for this by calling | |
3486 | receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional | |
3487 | input to be sent following the final dot, so the presence of following input is | |
3488 | not an error. | |
58eb016e | 3489 | |
563b63fa PH |
3490 | If the connection is still present, but there is no unread input for the |
3491 | socket, the result of a select() call will be zero. If, however, the connection | |
3492 | has gone away, or if there is pending input, the result of select() will be | |
3493 | non-zero. The two cases can be distinguished by trying to read the next input | |
3494 | character. If we succeed, we can unread it so that it remains in the local | |
3495 | buffer for handling later. If not, the connection has been lost. | |
58eb016e | 3496 | |
563b63fa PH |
3497 | Of course, since TCP/IP is asynchronous, there is always a chance that the |
3498 | connection will vanish between the time of this test and the sending of the | |
3499 | response, but the chance of this happening should be small. */ | |
3500 | ||
3501 | if (smtp_input && sender_host_address != NULL && !sender_host_notsocket && | |
3502 | !receive_smtp_buffered()) | |
58eb016e PH |
3503 | { |
3504 | struct timeval tv; | |
3505 | fd_set select_check; | |
3506 | FD_ZERO(&select_check); | |
3507 | FD_SET(fileno(smtp_in), &select_check); | |
3508 | tv.tv_sec = 0; | |
3509 | tv.tv_usec = 0; | |
3510 | ||
563b63fa | 3511 | if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0) |
58eb016e | 3512 | { |
563b63fa PH |
3513 | int c = (RECEIVE_GETC)(); |
3514 | if (c != EOF) (RECEIVE_UNGETC)(c); else | |
58eb016e | 3515 | { |
563b63fa PH |
3516 | uschar *msg = US"SMTP connection lost after final dot"; |
3517 | smtp_reply = US""; /* No attempt to send a response */ | |
3518 | smtp_yield = FALSE; /* Nothing more on this connection */ | |
58eb016e | 3519 | |
563b63fa | 3520 | /* Re-use the log line workspace */ |
58eb016e | 3521 | |
563b63fa PH |
3522 | sptr = 0; |
3523 | s = string_cat(s, &size, &sptr, msg, Ustrlen(msg)); | |
3524 | s = add_host_info_for_log(s, &size, &sptr); | |
3525 | s[sptr] = 0; | |
3526 | log_write(0, LOG_MAIN, "%s", s); | |
58eb016e | 3527 | |
563b63fa | 3528 | /* Delete the files for this aborted message. */ |
58eb016e | 3529 | |
563b63fa PH |
3530 | sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, |
3531 | message_subdir, message_id); | |
3532 | Uunlink(spool_name); | |
58eb016e | 3533 | |
563b63fa PH |
3534 | sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory, |
3535 | message_subdir, message_id); | |
3536 | Uunlink(spool_name); | |
58eb016e | 3537 | |
563b63fa PH |
3538 | sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, |
3539 | message_subdir, message_id); | |
3540 | Uunlink(spool_name); | |
58eb016e | 3541 | |
563b63fa PH |
3542 | goto TIDYUP; |
3543 | } | |
58eb016e PH |
3544 | } |
3545 | } | |
3546 | ||
3547 | /* The connection has not gone away; we really are going to take responsibility | |
3548 | for this message. */ | |
3549 | ||
3550 | log_write(0, LOG_MAIN | | |
3551 | (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) | | |
3552 | (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0), | |
3553 | "%s", s); | |
3554 | receive_call_bombout = FALSE; | |
3555 | ||
3556 | /* Log any control actions taken by an ACL or local_scan(). */ | |
3557 | ||
3558 | if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by); | |
3559 | if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN, | |
3560 | "no immediate delivery: queued by %s", queued_by); | |
3561 | ||
059ec3d9 PH |
3562 | store_reset(s); /* The store for the main log message can be reused */ |
3563 | ||
3564 | /* If the message is frozen, and freeze_tell is set, do the telling. */ | |
3565 | ||
3566 | if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0) | |
3567 | { | |
3568 | moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival", | |
3569 | "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n", | |
3570 | message_id, frozen_by, sender_address); | |
3571 | } | |
3572 | ||
3573 | ||
3574 | /* Either a message has been successfully received and written to the two spool | |
3575 | files, or an error in writing the spool has occurred for an SMTP message, or | |
58eb016e PH |
3576 | an SMTP message has been rejected for policy reasons. (For a non-SMTP message |
3577 | we will have already given up because there's no point in carrying on!) In | |
3578 | either event, we must now close (and thereby unlock) the data file. In the | |
059ec3d9 PH |
3579 | successful case, this leaves the message on the spool, ready for delivery. In |
3580 | the error case, the spool file will be deleted. Then tidy up store, interact | |
3581 | with an SMTP call if necessary, and return. | |
3582 | ||
3583 | A fflush() was done earlier in the expectation that any write errors on the | |
3584 | data file will be flushed(!) out thereby. Nevertheless, it is theoretically | |
3585 | possible for fclose() to fail - but what to do? What has happened to the lock | |
3586 | if this happens? */ | |
3587 | ||
3588 | TIDYUP: | |
f1e894f3 PH |
3589 | process_info[process_info_len] = 0; /* Remove message id */ |
3590 | if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */ | |
059ec3d9 PH |
3591 | |
3592 | /* Now reset signal handlers to their defaults */ | |
3593 | ||
3594 | signal(SIGTERM, SIG_DFL); | |
3595 | signal(SIGINT, SIG_DFL); | |
3596 | ||
3597 | /* Tell an SMTP caller the state of play, and arrange to return the SMTP return | |
3598 | value, which defaults TRUE - meaning there may be more incoming messages from | |
3599 | this connection. For non-SMTP callers (where there is only ever one message), | |
3600 | the default is FALSE. */ | |
3601 | ||
3602 | if (smtp_input) | |
3603 | { | |
3604 | yield = smtp_yield; | |
3605 | ||
3606 | /* Handle interactive SMTP callers. After several kinds of error, smtp_reply | |
58eb016e PH |
3607 | is set to the response that should be sent. When it is NULL, we generate |
3608 | default responses. After an ACL error or local_scan() error, the response has | |
3609 | already been sent, and smtp_reply is an empty string to indicate this. */ | |
059ec3d9 PH |
3610 | |
3611 | if (!smtp_batched_input) | |
3612 | { | |
3613 | if (smtp_reply == NULL) | |
3614 | { | |
29aba418 | 3615 | if (fake_response != OK) |
a5bd321b PH |
3616 | smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE, |
3617 | fake_response_text); | |
4e88a19f PH |
3618 | |
3619 | /* An OK response is required; use "message" text if present. */ | |
3620 | ||
3621 | else if (user_msg != NULL) | |
3622 | { | |
3623 | uschar *code = US"250"; | |
3624 | int len = 3; | |
3625 | smtp_message_code(&code, &len, &user_msg, NULL); | |
3626 | smtp_respond(code, len, TRUE, user_msg); | |
3627 | } | |
3628 | ||
3629 | /* Default OK response */ | |
3630 | ||
8e669ac1 PH |
3631 | else |
3632 | smtp_printf("250 OK id=%s\r\n", message_id); | |
059ec3d9 PH |
3633 | if (host_checking) |
3634 | fprintf(stdout, | |
3635 | "\n**** SMTP testing: that is not a real message id!\n\n"); | |
3636 | } | |
4e88a19f | 3637 | |
58eb016e | 3638 | /* smtp_reply is set non-empty */ |
4e88a19f | 3639 | |
8523533c TK |
3640 | else if (smtp_reply[0] != 0) |
3641 | { | |
29aba418 | 3642 | if (fake_response != OK && (smtp_reply[0] == '2')) |
a5bd321b PH |
3643 | smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE, |
3644 | fake_response_text); | |
8e669ac1 | 3645 | else |
6951ac6c PH |
3646 | smtp_printf("%.1024s\r\n", smtp_reply); |
3647 | } | |
059ec3d9 PH |
3648 | } |
3649 | ||
3650 | /* For batched SMTP, generate an error message on failure, and do | |
3651 | nothing on success. The function moan_smtp_batch() does not return - | |
3652 | it exits from the program with a non-zero return code. */ | |
3653 | ||
3654 | else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply); | |
3655 | } | |
3656 | ||
3657 | ||
3658 | /* If blackholing, we can immediately log this message's sad fate. The data | |
3659 | file has already been unlinked, and the header file was never written to disk. | |
3660 | We must now indicate that nothing was received, to prevent a delivery from | |
3661 | starting. */ | |
3662 | ||
3663 | if (blackholed_by != NULL) | |
3664 | { | |
3665 | uschar *detail = (local_scan_data != NULL)? | |
3666 | string_printing(local_scan_data) : | |
3667 | string_sprintf("(%s discarded recipients)", blackholed_by); | |
04f7d5b9 | 3668 | log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg); |
059ec3d9 PH |
3669 | log_write(0, LOG_MAIN, "Completed"); |
3670 | message_id[0] = 0; | |
3671 | } | |
3672 | ||
3673 | /* Reset headers so that logging of rejects for a subsequent message doesn't | |
3674 | include them. It is also important to set header_last = NULL before exiting | |
3675 | from this function, as this prevents certain rewrites that might happen during | |
3676 | subsequent verifying (of another incoming message) from trying to add headers | |
3677 | when they shouldn't. */ | |
3678 | ||
3679 | header_list = header_last = NULL; | |
3680 | ||
3681 | return yield; /* TRUE if more messages (SMTP only) */ | |
3682 | } | |
3683 | ||
3684 | /* End of receive.c */ |