Handle recursion better, caused by ACLs.
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 /* Code for receiving a message and setting up spool files. */
9
10 #include "exim.h"
11
12 #ifdef EXPERIMENTAL_DCC
13 extern int dcc_ok;
14 #endif
15
16 /*************************************************
17 * Local static variables *
18 *************************************************/
19
20 static FILE *data_file = NULL;
21 static int data_fd = -1;
22 static uschar spool_name[256];
23
24
25
26 /*************************************************
27 * Non-SMTP character reading functions *
28 *************************************************/
29
30 /* These are the default functions that are set up in the variables such as
31 receive_getc initially. They just call the standard functions, passing stdin as
32 the file. (When SMTP input is occurring, different functions are used by
33 changing the pointer variables.) */
34
35 int
36 stdin_getc(void)
37 {
38 return getc(stdin);
39 }
40
41 int
42 stdin_ungetc(int c)
43 {
44 return ungetc(c, stdin);
45 }
46
47 int
48 stdin_feof(void)
49 {
50 return feof(stdin);
51 }
52
53 int
54 stdin_ferror(void)
55 {
56 return ferror(stdin);
57 }
58
59
60
61
62 /*************************************************
63 * Check that a set sender is allowed *
64 *************************************************/
65
66 /* This function is called when a local caller sets an explicit sender address.
67 It checks whether this is permitted, which it is for trusted callers.
68 Otherwise, it must match the pattern(s) in untrusted_set_sender.
69
70 Arguments: the proposed sender address
71 Returns: TRUE for a trusted caller
72 TRUE if the address has been set, untrusted_set_sender has been
73 set, and the address matches something in the list
74 FALSE otherwise
75 */
76
77 BOOL
78 receive_check_set_sender(uschar *newsender)
79 {
80 uschar *qnewsender;
81 if (trusted_caller) return TRUE;
82 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
83 qnewsender = (Ustrchr(newsender, '@') != NULL)?
84 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
85 return
86 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
87 0, NULL) == OK;
88 }
89
90
91
92
93 /*************************************************
94 * Read space info for a partition *
95 *************************************************/
96
97 /* This function is called by receive_check_fs() below, and also by string
98 expansion for variables such as $spool_space. The field names for the statvfs
99 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
100 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
101 have inodes, and they return -1 for the number available.
102
103 Later: It turns out that some file systems that do not have the concept of
104 inodes return 0 rather than -1. Such systems should also return 0 for the total
105 number of inodes, so we require that to be greater than zero before returning
106 an inode count.
107
108 Arguments:
109 isspool TRUE for spool partition, FALSE for log partition
110 inodeptr address of int to receive inode count; -1 if there isn't one
111
112 Returns: available on-root space, in kilobytes
113 -1 for log partition if there isn't one
114
115 All values are -1 if the STATFS functions are not available.
116 */
117
118 int
119 receive_statvfs(BOOL isspool, int *inodeptr)
120 {
121 #ifdef HAVE_STATFS
122 struct STATVFS statbuf;
123 uschar *path;
124 uschar *name;
125 uschar buffer[1024];
126
127 /* The spool directory must always exist. */
128
129 if (isspool)
130 {
131 path = spool_directory;
132 name = US"spool";
133 }
134
135 /* Need to cut down the log file path to the directory, and to ignore any
136 appearance of "syslog" in it. */
137
138 else
139 {
140 int sep = ':'; /* Not variable - outside scripts use */
141 uschar *p = log_file_path;
142 name = US"log";
143
144 /* An empty log_file_path means "use the default". This is the same as an
145 empty item in a list. */
146
147 if (*p == 0) p = US":";
148 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
149 {
150 if (Ustrcmp(path, "syslog") != 0) break;
151 }
152
153 if (path == NULL) /* No log files */
154 {
155 *inodeptr = -1;
156 return -1;
157 }
158
159 /* An empty string means use the default, which is in the spool directory.
160 But don't just use the spool directory, as it is possible that the log
161 subdirectory has been symbolically linked elsewhere. */
162
163 if (path[0] == 0)
164 {
165 sprintf(CS buffer, CS"%s/log", CS spool_directory);
166 path = buffer;
167 }
168 else
169 {
170 uschar *cp;
171 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
172 }
173 }
174
175 /* We now have the path; do the business */
176
177 memset(&statbuf, 0, sizeof(statbuf));
178
179 if (STATVFS(CS path, &statbuf) != 0)
180 {
181 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
182 "%s directory %s: %s", name, spool_directory, strerror(errno));
183 smtp_closedown(US"spool or log directory problem");
184 exim_exit(EXIT_FAILURE);
185 }
186
187 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
188
189 /* Disks are getting huge. Take care with computing the size in kilobytes. */
190
191 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
192
193 /* Unable to find partition sizes in this environment. */
194
195 #else
196 *inodeptr = -1;
197 return -1;
198 #endif
199 }
200
201
202
203
204 /*************************************************
205 * Check space on spool and log partitions *
206 *************************************************/
207
208 /* This function is called before accepting a message; if any thresholds are
209 set, it checks them. If a message_size is supplied, it checks that there is
210 enough space for that size plus the threshold - i.e. that the message won't
211 reduce the space to the threshold. Not all OS have statvfs(); for those that
212 don't, this function always returns TRUE. For some OS the old function and
213 struct name statfs is used; that is handled by a macro, defined in exim.h.
214
215 Arguments:
216 msg_size the (estimated) size of an incoming message
217
218 Returns: FALSE if there isn't enough space, or if the information cannot
219 be obtained
220 TRUE if no check was done or there is enough space
221 */
222
223 BOOL
224 receive_check_fs(int msg_size)
225 {
226 int space, inodes;
227
228 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
229 {
230 space = receive_statvfs(TRUE, &inodes);
231
232 DEBUG(D_receive)
233 debug_printf("spool directory space = %dK inodes = %d "
234 "check_space = %dK inodes = %d msg_size = %d\n",
235 space, inodes, check_spool_space, check_spool_inodes, msg_size);
236
237 if ((space >= 0 && space < check_spool_space) ||
238 (inodes >= 0 && inodes < check_spool_inodes))
239 {
240 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
241 "inodes=%d", space, inodes);
242 return FALSE;
243 }
244 }
245
246 if (check_log_space > 0 || check_log_inodes > 0)
247 {
248 space = receive_statvfs(FALSE, &inodes);
249
250 DEBUG(D_receive)
251 debug_printf("log directory space = %dK inodes = %d "
252 "check_space = %dK inodes = %d\n",
253 space, inodes, check_log_space, check_log_inodes);
254
255 if ((space >= 0 && space < check_log_space) ||
256 (inodes >= 0 && inodes < check_log_inodes))
257 {
258 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
259 "inodes=%d", space, inodes);
260 return FALSE;
261 }
262 }
263
264 return TRUE;
265 }
266
267
268
269 /*************************************************
270 * Bomb out while reading a message *
271 *************************************************/
272
273 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
274 received, or if there is a timeout. A rarer case might be if the log files are
275 screwed up and Exim can't open them to record a message's arrival. Handling
276 that case is done by setting a flag to cause the log functions to call this
277 function if there is an ultimate disaster. That is why it is globally
278 accessible.
279
280 Arguments:
281 reason text reason to pass to the not-quit ACL
282 msg default SMTP response to give if in an SMTP session
283 Returns: it doesn't
284 */
285
286 void
287 receive_bomb_out(uschar *reason, uschar *msg)
288 {
289 static BOOL already_bombing_out;
290 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
291 timeouts, if someone has something slow in their quit ACL. Since the only
292 things we should be doing are to close down cleanly ASAP, on the second
293 pass we also close down stuff that might be opened again, before bypassing
294 the ACL call and exiting. */
295
296 /* If spool_name is set, it contains the name of the data file that is being
297 written. Unlink it before closing so that it cannot be picked up by a delivery
298 process. Ensure that any header file is also removed. */
299
300 if (spool_name[0] != '\0')
301 {
302 Uunlink(spool_name);
303 spool_name[Ustrlen(spool_name) - 1] = 'H';
304 Uunlink(spool_name);
305 spool_name[0] = '\0';
306 }
307
308 /* Now close the file if it is open, either as a fd or a stream. */
309
310 if (data_file != NULL)
311 {
312 (void)fclose(data_file);
313 data_file = NULL;
314 } else if (data_fd >= 0) {
315 (void)close(data_fd);
316 data_fd = -1;
317 }
318
319 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
320 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
321 SMTP response. */
322
323 if (!already_bombing_out)
324 {
325 already_bombing_out = TRUE;
326 if (smtp_input)
327 {
328 if (smtp_batched_input)
329 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
330 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
331 smtp_active_hostname, msg);
332 }
333 }
334
335 /* Exit from the program (non-BSMTP cases) */
336
337 exim_exit(EXIT_FAILURE);
338 }
339
340
341 /*************************************************
342 * Data read timeout *
343 *************************************************/
344
345 /* Handler function for timeouts that occur while reading the data that
346 comprises a message.
347
348 Argument: the signal number
349 Returns: nothing
350 */
351
352 static void
353 data_timeout_handler(int sig)
354 {
355 uschar *msg = NULL;
356
357 sig = sig; /* Keep picky compilers happy */
358
359 if (smtp_input)
360 {
361 msg = US"SMTP incoming data timeout";
362 log_write(L_lost_incoming_connection,
363 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
364 "from %s F=<%s>",
365 (sender_fullhost != NULL)? sender_fullhost : US"local process",
366 sender_address);
367 }
368 else
369 {
370 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
371 log_write(L_lost_incoming_connection,
372 LOG_MAIN, "timed out while reading local message");
373 }
374
375 receive_bomb_out(US"data-timeout", msg); /* Does not return */
376 }
377
378
379
380 /*************************************************
381 * local_scan() timeout *
382 *************************************************/
383
384 /* Handler function for timeouts that occur while running a local_scan()
385 function.
386
387 Argument: the signal number
388 Returns: nothing
389 */
390
391 static void
392 local_scan_timeout_handler(int sig)
393 {
394 sig = sig; /* Keep picky compilers happy */
395 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
396 "message temporarily rejected (size %d)", message_size);
397 /* Does not return */
398 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
399 }
400
401
402
403 /*************************************************
404 * local_scan() crashed *
405 *************************************************/
406
407 /* Handler function for signals that occur while running a local_scan()
408 function.
409
410 Argument: the signal number
411 Returns: nothing
412 */
413
414 static void
415 local_scan_crash_handler(int sig)
416 {
417 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
418 "signal %d - message temporarily rejected (size %d)", sig, message_size);
419 /* Does not return */
420 receive_bomb_out(US"local-scan-error", US"local verification problem");
421 }
422
423
424 /*************************************************
425 * SIGTERM or SIGINT received *
426 *************************************************/
427
428 /* Handler for SIGTERM or SIGINT signals that occur while reading the
429 data that comprises a message.
430
431 Argument: the signal number
432 Returns: nothing
433 */
434
435 static void
436 data_sigterm_sigint_handler(int sig)
437 {
438 uschar *msg = NULL;
439
440 if (smtp_input)
441 {
442 msg = US"Service not available - SIGTERM or SIGINT received";
443 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
444 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
445 }
446 else
447 {
448 if (filter_test == FTEST_NONE)
449 {
450 fprintf(stderr, "\nexim: %s received - message abandoned\n",
451 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
452 log_write(0, LOG_MAIN, "%s received while reading local message",
453 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
454 }
455 }
456
457 receive_bomb_out(US"signal-exit", msg); /* Does not return */
458 }
459
460
461
462 /*************************************************
463 * Add new recipient to list *
464 *************************************************/
465
466 /* This function builds a list of recipient addresses in argc/argv
467 format.
468
469 Arguments:
470 recipient the next address to add to recipients_list
471 pno parent number for fixed aliases; -1 otherwise
472
473 Returns: nothing
474 */
475
476 void
477 receive_add_recipient(uschar *recipient, int pno)
478 {
479 if (recipients_count >= recipients_list_max)
480 {
481 recipient_item *oldlist = recipients_list;
482 int oldmax = recipients_list_max;
483 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
484 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
485 if (oldlist != NULL)
486 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
487 }
488
489 recipients_list[recipients_count].address = recipient;
490 recipients_list[recipients_count].pno = pno;
491 #ifdef EXPERIMENTAL_BRIGHTMAIL
492 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
493 /* reset optin string pointer for next recipient */
494 bmi_current_optin = NULL;
495 #endif
496 recipients_list[recipients_count++].errors_to = NULL;
497 }
498
499
500
501
502 /*************************************************
503 * Send user response message *
504 *************************************************/
505
506 /* This function is passed a default response code and a user message. It calls
507 smtp_message_code() to check and possibly modify the response code, and then
508 calls smtp_respond() to transmit the response. I put this into a function
509 just to avoid a lot of repetition.
510
511 Arguments:
512 code the response code
513 user_msg the user message
514
515 Returns: nothing
516 */
517
518 static void
519 smtp_user_msg(uschar *code, uschar *user_msg)
520 {
521 int len = 3;
522 smtp_message_code(&code, &len, &user_msg, NULL);
523 smtp_respond(code, len, TRUE, user_msg);
524 }
525
526
527
528
529
530 /*************************************************
531 * Remove a recipient from the list *
532 *************************************************/
533
534 /* This function is provided for local_scan() to use.
535
536 Argument:
537 recipient address to remove
538
539 Returns: TRUE if it did remove something; FALSE otherwise
540 */
541
542 BOOL
543 receive_remove_recipient(uschar *recipient)
544 {
545 int count;
546 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
547 recipient);
548 for (count = 0; count < recipients_count; count++)
549 {
550 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
551 {
552 if ((--recipients_count - count) > 0)
553 memmove(recipients_list + count, recipients_list + count + 1,
554 (recipients_count - count)*sizeof(recipient_item));
555 return TRUE;
556 }
557 }
558 return FALSE;
559 }
560
561
562
563
564
565 /*************************************************
566 * Read data portion of a non-SMTP message *
567 *************************************************/
568
569 /* This function is called to read the remainder of a message (following the
570 header) when the input is not from SMTP - we are receiving a local message on
571 a standard input stream. The message is always terminated by EOF, and is also
572 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
573 two cases for maximum efficiency.
574
575 Ensure that the body ends with a newline. This will naturally be the case when
576 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
577 as "sequences of lines" - this of course strictly applies only to SMTP, but
578 deliveries into BSD-type mailbox files also require it. Exim used to have a
579 flag for doing this at delivery time, but as it was always set for all
580 transports, I decided to simplify things by putting the check here instead.
581
582 There is at least one MUA (dtmail) that sends CRLF via this interface, and
583 other programs are known to do this as well. Exim used to have a option for
584 dealing with this: in July 2003, after much discussion, the code has been
585 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
586
587 However, for the case when a dot on a line by itself terminates a message, the
588 only recognized terminating sequences before and after the dot are LF and CRLF.
589 Otherwise, having read EOL . CR, you don't know whether to read another
590 character or not.
591
592 Internally, in messages stored in Exim's spool files, LF is used as the line
593 terminator. Under the new regime, bare CRs will no longer appear in these
594 files.
595
596 Arguments:
597 fout a FILE to which to write the message
598
599 Returns: One of the END_xxx values indicating why it stopped reading
600 */
601
602 static int
603 read_message_data(FILE *fout)
604 {
605 int ch_state;
606 register int ch;
607 register int linelength = 0;
608
609 /* Handle the case when only EOF terminates the message */
610
611 if (!dot_ends)
612 {
613 register int last_ch = '\n';
614
615 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
616 {
617 if (ch == 0) body_zerocount++;
618 if (last_ch == '\r' && ch != '\n')
619 {
620 if (linelength > max_received_linelength)
621 max_received_linelength = linelength;
622 linelength = 0;
623 if (fputc('\n', fout) == EOF) return END_WERROR;
624 message_size++;
625 body_linecount++;
626 }
627 if (ch == '\r') continue;
628
629 if (fputc(ch, fout) == EOF) return END_WERROR;
630 if (ch == '\n')
631 {
632 if (linelength > max_received_linelength)
633 max_received_linelength = linelength;
634 linelength = 0;
635 body_linecount++;
636 }
637 else linelength++;
638 if (++message_size > thismessage_size_limit) return END_SIZE;
639 }
640
641 if (last_ch != '\n')
642 {
643 if (linelength > max_received_linelength)
644 max_received_linelength = linelength;
645 if (fputc('\n', fout) == EOF) return END_WERROR;
646 message_size++;
647 body_linecount++;
648 }
649
650 return END_EOF;
651 }
652
653 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
654
655 ch_state = 1;
656
657 while ((ch = (receive_getc)()) != EOF)
658 {
659 if (ch == 0) body_zerocount++;
660 switch (ch_state)
661 {
662 case 0: /* Normal state (previous char written) */
663 if (ch == '\n')
664 {
665 body_linecount++;
666 if (linelength > max_received_linelength)
667 max_received_linelength = linelength;
668 linelength = -1;
669 ch_state = 1;
670 }
671 else if (ch == '\r')
672 { ch_state = 2; continue; }
673 break;
674
675 case 1: /* After written "\n" */
676 if (ch == '.') { ch_state = 3; continue; }
677 if (ch != '\n') ch_state = 0; else linelength = -1;
678 break;
679
680 case 2:
681 body_linecount++; /* After unwritten "\r" */
682 if (linelength > max_received_linelength)
683 max_received_linelength = linelength;
684 if (ch == '\n')
685 {
686 ch_state = 1;
687 linelength = -1;
688 }
689 else
690 {
691 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
692 if (ch == '\r') continue;
693 ch_state = 0;
694 linelength = 0;
695 }
696 break;
697
698 case 3: /* After "\n." (\n written, dot not) */
699 if (ch == '\n') return END_DOT;
700 if (ch == '\r') { ch_state = 4; continue; }
701 message_size++;
702 linelength++;
703 if (fputc('.', fout) == EOF) return END_WERROR;
704 ch_state = 0;
705 break;
706
707 case 4: /* After "\n.\r" (\n written, rest not) */
708 if (ch == '\n') return END_DOT;
709 message_size += 2;
710 body_linecount++;
711 if (fputs(".\n", fout) == EOF) return END_WERROR;
712 if (ch == '\r') { ch_state = 2; continue; }
713 ch_state = 0;
714 break;
715 }
716
717 linelength++;
718 if (fputc(ch, fout) == EOF) return END_WERROR;
719 if (++message_size > thismessage_size_limit) return END_SIZE;
720 }
721
722 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
723 the message ends with a newline, and we must also write any characters that
724 were saved up while testing for an ending dot. */
725
726 if (ch_state != 1)
727 {
728 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
729 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
730 message_size += Ustrlen(ends[ch_state]);
731 body_linecount++;
732 }
733
734 return END_EOF;
735 }
736
737
738
739
740 /*************************************************
741 * Read data portion of an SMTP message *
742 *************************************************/
743
744 /* This function is called to read the remainder of an SMTP message (after the
745 headers), or to skip over it when an error has occurred. In this case, the
746 output file is passed as NULL.
747
748 If any line begins with a dot, that character is skipped. The input should only
749 be successfully terminated by CR LF . CR LF unless it is local (non-network)
750 SMTP, in which case the CRs are optional, but...
751
752 FUDGE: It seems that sites on the net send out messages with just LF
753 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
754 we make the CRs optional in all cases.
755
756 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
757 well, so that there are no CRs in spooled messages. However, the message
758 terminating dot is not recognized between two bare CRs.
759
760 Arguments:
761 fout a FILE to which to write the message; NULL if skipping
762
763 Returns: One of the END_xxx values indicating why it stopped reading
764 */
765
766 static int
767 read_message_data_smtp(FILE *fout)
768 {
769 int ch_state = 0;
770 int ch;
771 register int linelength = 0;
772
773 while ((ch = (receive_getc)()) != EOF)
774 {
775 if (ch == 0) body_zerocount++;
776 switch (ch_state)
777 {
778 case 0: /* After LF or CRLF */
779 if (ch == '.')
780 {
781 ch_state = 3;
782 continue; /* Don't ever write . after LF */
783 }
784 ch_state = 1;
785
786 /* Else fall through to handle as normal uschar. */
787
788 case 1: /* Normal state */
789 if (ch == '\n')
790 {
791 ch_state = 0;
792 body_linecount++;
793 if (linelength > max_received_linelength)
794 max_received_linelength = linelength;
795 linelength = -1;
796 }
797 else if (ch == '\r')
798 {
799 ch_state = 2;
800 continue;
801 }
802 break;
803
804 case 2: /* After (unwritten) CR */
805 body_linecount++;
806 if (linelength > max_received_linelength)
807 max_received_linelength = linelength;
808 linelength = -1;
809 if (ch == '\n')
810 {
811 ch_state = 0;
812 }
813 else
814 {
815 message_size++;
816 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
817 (void) cutthrough_put_nl();
818 if (ch != '\r') ch_state = 1; else continue;
819 }
820 break;
821
822 case 3: /* After [CR] LF . */
823 if (ch == '\n')
824 return END_DOT;
825 if (ch == '\r')
826 {
827 ch_state = 4;
828 continue;
829 }
830 ch_state = 1; /* The dot itself is removed */
831 break;
832
833 case 4: /* After [CR] LF . CR */
834 if (ch == '\n') return END_DOT;
835 message_size++;
836 body_linecount++;
837 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
838 (void) cutthrough_put_nl();
839 if (ch == '\r')
840 {
841 ch_state = 2;
842 continue;
843 }
844 ch_state = 1;
845 break;
846 }
847
848 /* Add the character to the spool file, unless skipping; then loop for the
849 next. */
850
851 message_size++;
852 linelength++;
853 if (fout != NULL)
854 {
855 if (fputc(ch, fout) == EOF) return END_WERROR;
856 if (message_size > thismessage_size_limit) return END_SIZE;
857 }
858 if(ch == '\n')
859 (void) cutthrough_put_nl();
860 else
861 {
862 uschar c= ch;
863 (void) cutthrough_puts(&c, 1);
864 }
865 }
866
867 /* Fall through here if EOF encountered. This indicates some kind of error,
868 since a correct message is terminated by [CR] LF . [CR] LF. */
869
870 return END_EOF;
871 }
872
873
874
875
876 /*************************************************
877 * Swallow SMTP message *
878 *************************************************/
879
880 /* This function is called when there has been some kind of error while reading
881 an SMTP message, and the remaining data may need to be swallowed. It is global
882 because it is called from smtp_closedown() to shut down an incoming call
883 tidily.
884
885 Argument: a FILE from which to read the message
886 Returns: nothing
887 */
888
889 void
890 receive_swallow_smtp(void)
891 {
892 if (message_ended >= END_NOTENDED)
893 message_ended = read_message_data_smtp(NULL);
894 }
895
896
897
898 /*************************************************
899 * Handle lost SMTP connection *
900 *************************************************/
901
902 /* This function logs connection loss incidents and generates an appropriate
903 SMTP response.
904
905 Argument: additional data for the message
906 Returns: the SMTP response
907 */
908
909 static uschar *
910 handle_lost_connection(uschar *s)
911 {
912 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
913 "%s lost while reading message data%s", smtp_get_connection_info(), s);
914 return US"421 Lost incoming connection";
915 }
916
917
918
919
920 /*************************************************
921 * Handle a non-smtp reception error *
922 *************************************************/
923
924 /* This function is called for various errors during the reception of non-SMTP
925 messages. It either sends a message to the sender of the problem message, or it
926 writes to the standard error stream.
927
928 Arguments:
929 errcode code for moan_to_sender(), identifying the error
930 text1 first message text, passed to moan_to_sender()
931 text2 second message text, used only for stderrr
932 error_rc code to pass to exim_exit if no problem
933 f FILE containing body of message (may be stdin)
934 hptr pointer to instore headers or NULL
935
936 Returns: calls exim_exit(), which does not return
937 */
938
939 static void
940 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
941 FILE *f, header_line *hptr)
942 {
943 if (error_handling == ERRORS_SENDER)
944 {
945 error_block eblock;
946 eblock.next = NULL;
947 eblock.text1 = text1;
948 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
949 error_rc = EXIT_FAILURE;
950 }
951 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
952 (void)fclose(f);
953 exim_exit(error_rc);
954 }
955
956
957
958 /*************************************************
959 * Add header lines set up by ACL *
960 *************************************************/
961
962 /* This function is called to add the header lines that were set up by
963 statements in an ACL to the list of headers in memory. It is done in two stages
964 like this, because when the ACL for RCPT is running, the other headers have not
965 yet been received. This function is called twice; once just before running the
966 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
967 are visible to the DATA ACL.
968
969 Originally these header lines were added at the end. Now there is support for
970 three different places: top, bottom, and after the Received: header(s). There
971 will always be at least one Received: header, even if it is marked deleted, and
972 even if something else has been put in front of it.
973
974 Arguments:
975 acl_name text to identify which ACL
976
977 Returns: nothing
978 */
979
980 static void
981 add_acl_headers(uschar *acl_name)
982 {
983 header_line *h, *next;
984 header_line *last_received = NULL;
985
986 if (acl_removed_headers != NULL)
987 {
988 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
989
990 for (h = header_list; h != NULL; h = h->next)
991 {
992 uschar *list;
993 BOOL include_header;
994
995 if (h->type == htype_old) continue;
996
997 include_header = TRUE;
998 list = acl_removed_headers;
999
1000 int sep = ':'; /* This is specified as a colon-separated list */
1001 uschar *s;
1002 uschar buffer[128];
1003 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer)))
1004 != NULL)
1005 {
1006 int len = Ustrlen(s);
1007 if (header_testname(h, s, len, FALSE))
1008 {
1009 h->type = htype_old;
1010 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1011 }
1012 }
1013 }
1014 acl_removed_headers = NULL;
1015 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1016 }
1017
1018 if (acl_added_headers == NULL) return;
1019 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1020
1021 for (h = acl_added_headers; h != NULL; h = next)
1022 {
1023 next = h->next;
1024
1025 switch(h->type)
1026 {
1027 case htype_add_top:
1028 h->next = header_list;
1029 header_list = h;
1030 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1031 break;
1032
1033 case htype_add_rec:
1034 if (last_received == NULL)
1035 {
1036 last_received = header_list;
1037 while (!header_testname(last_received, US"Received", 8, FALSE))
1038 last_received = last_received->next;
1039 while (last_received->next != NULL &&
1040 header_testname(last_received->next, US"Received", 8, FALSE))
1041 last_received = last_received->next;
1042 }
1043 h->next = last_received->next;
1044 last_received->next = h;
1045 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1046 break;
1047
1048 case htype_add_rfc:
1049 /* add header before any header which is NOT Received: or Resent- */
1050 last_received = header_list;
1051 while ( (last_received->next != NULL) &&
1052 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1053 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1054 last_received = last_received->next;
1055 /* last_received now points to the last Received: or Resent-* header
1056 in an uninterrupted chain of those header types (seen from the beginning
1057 of all headers. Our current header must follow it. */
1058 h->next = last_received->next;
1059 last_received->next = h;
1060 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1061 break;
1062
1063 default:
1064 h->next = NULL;
1065 header_last->next = h;
1066 break;
1067 }
1068
1069 if (h->next == NULL) header_last = h;
1070
1071 /* Check for one of the known header types (From:, To:, etc.) though in
1072 practice most added headers are going to be "other". Lower case
1073 identification letters are never stored with the header; they are used
1074 for existence tests when messages are received. So discard any lower case
1075 flag values. */
1076
1077 h->type = header_checkname(h, FALSE);
1078 if (h->type >= 'a') h->type = htype_other;
1079
1080 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1081 }
1082
1083 acl_added_headers = NULL;
1084 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1085 }
1086
1087
1088
1089 /*************************************************
1090 * Add host information for log line *
1091 *************************************************/
1092
1093 /* Called for acceptance and rejecting log lines. This adds information about
1094 the calling host to a string that is being built dynamically.
1095
1096 Arguments:
1097 s the dynamic string
1098 sizeptr points to the size variable
1099 ptrptr points to the pointer variable
1100
1101 Returns: the extended string
1102 */
1103
1104 static uschar *
1105 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1106 {
1107 if (sender_fullhost != NULL)
1108 {
1109 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1110 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1111 interface_address != NULL)
1112 {
1113 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1114 interface_port);
1115 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1116 }
1117 }
1118 if (sender_ident != NULL)
1119 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1120 if (received_protocol != NULL)
1121 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1122 return s;
1123 }
1124
1125
1126
1127 #ifdef WITH_CONTENT_SCAN
1128
1129 /*************************************************
1130 * Run the MIME ACL on a message *
1131 *************************************************/
1132
1133 /* This code is in a subroutine so that it can be used for both SMTP
1134 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1135
1136 Arguments:
1137 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1138 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1139 smtp_reply_ptr Where SMTP reply is being built
1140 blackholed_by_ptr Where "blackholed by" message is being built
1141
1142 Returns: TRUE to carry on; FALSE to abandon the message
1143 */
1144
1145 static BOOL
1146 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1147 uschar **blackholed_by_ptr)
1148 {
1149 FILE *mbox_file;
1150 uschar rfc822_file_path[2048];
1151 unsigned long mbox_size;
1152 header_line *my_headerlist;
1153 uschar *user_msg, *log_msg;
1154 int mime_part_count_buffer = -1;
1155 int rc = OK;
1156
1157 memset(CS rfc822_file_path,0,2048);
1158
1159 /* check if it is a MIME message */
1160 my_headerlist = header_list;
1161 while (my_headerlist != NULL)
1162 {
1163 /* skip deleted headers */
1164 if (my_headerlist->type == '*')
1165 {
1166 my_headerlist = my_headerlist->next;
1167 continue;
1168 }
1169 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1170 {
1171 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1172 goto DO_MIME_ACL;
1173 }
1174 my_headerlist = my_headerlist->next;
1175 }
1176
1177 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1178 return TRUE;
1179
1180 DO_MIME_ACL:
1181 /* make sure the eml mbox file is spooled up */
1182 mbox_file = spool_mbox(&mbox_size, NULL);
1183 if (mbox_file == NULL) {
1184 /* error while spooling */
1185 log_write(0, LOG_MAIN|LOG_PANIC,
1186 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1187 Uunlink(spool_name);
1188 unspool_mbox();
1189 #ifdef EXPERIMENTAL_DCC
1190 dcc_ok = 0;
1191 #endif
1192 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1193 message_id[0] = 0; /* Indicate no message accepted */
1194 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1195 return FALSE; /* Indicate skip to end of receive function */
1196 };
1197
1198 mime_is_rfc822 = 0;
1199
1200 MIME_ACL_CHECK:
1201 mime_part_count = -1;
1202 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1203 (void)fclose(mbox_file);
1204
1205 if (Ustrlen(rfc822_file_path) > 0)
1206 {
1207 mime_part_count = mime_part_count_buffer;
1208
1209 if (unlink(CS rfc822_file_path) == -1)
1210 {
1211 log_write(0, LOG_PANIC,
1212 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1213 goto END_MIME_ACL;
1214 }
1215 }
1216
1217 /* check if we must check any message/rfc822 attachments */
1218 if (rc == OK)
1219 {
1220 uschar temp_path[1024];
1221 int n;
1222 struct dirent *entry;
1223 DIR *tempdir;
1224
1225 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1226 message_id);
1227
1228 tempdir = opendir(CS temp_path);
1229 n = 0;
1230 do
1231 {
1232 entry = readdir(tempdir);
1233 if (entry == NULL) break;
1234 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1235 {
1236 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1237 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1238 break;
1239 }
1240 } while (1);
1241 closedir(tempdir);
1242
1243 if (entry != NULL)
1244 {
1245 mbox_file = Ufopen(rfc822_file_path,"rb");
1246 if (mbox_file == NULL)
1247 {
1248 log_write(0, LOG_PANIC,
1249 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1250 unlink(CS rfc822_file_path);
1251 goto END_MIME_ACL;
1252 }
1253 /* set RFC822 expansion variable */
1254 mime_is_rfc822 = 1;
1255 mime_part_count_buffer = mime_part_count;
1256 goto MIME_ACL_CHECK;
1257 }
1258 }
1259
1260 END_MIME_ACL:
1261 add_acl_headers(US"MIME");
1262 if (rc == DISCARD)
1263 {
1264 recipients_count = 0;
1265 *blackholed_by_ptr = US"MIME ACL";
1266 }
1267 else if (rc != OK)
1268 {
1269 Uunlink(spool_name);
1270 unspool_mbox();
1271 #ifdef EXPERIMENTAL_DCC
1272 dcc_ok = 0;
1273 #endif
1274 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1275 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1276 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1277 message_id[0] = 0; /* Indicate no message accepted */
1278 return FALSE; /* Cause skip to end of receive function */
1279 }
1280
1281 return TRUE;
1282 }
1283
1284 #endif /* WITH_CONTENT_SCAN */
1285
1286
1287
1288 void
1289 received_header_gen(void)
1290 {
1291 uschar *received;
1292 uschar *timestamp;
1293 header_line *received_header= header_list;
1294
1295 timestamp = expand_string(US"${tod_full}");
1296 if (recipients_count == 1) received_for = recipients_list[0].address;
1297 received = expand_string(received_header_text);
1298 received_for = NULL;
1299
1300 if (received == NULL)
1301 {
1302 if(spool_name[0] != 0)
1303 Uunlink(spool_name); /* Lose the data file */
1304 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1305 "(received_header_text) failed: %s", string_printing(received_header_text),
1306 expand_string_message);
1307 }
1308
1309 /* The first element on the header chain is reserved for the Received header,
1310 so all we have to do is fill in the text pointer, and set the type. However, if
1311 the result of the expansion is an empty string, we leave the header marked as
1312 "old" so as to refrain from adding a Received header. */
1313
1314 if (received[0] == 0)
1315 {
1316 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1317 received_header->type = htype_old;
1318 }
1319 else
1320 {
1321 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1322 received_header->type = htype_received;
1323 }
1324
1325 received_header->slen = Ustrlen(received_header->text);
1326
1327 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1328 received_header->type, received_header->text);
1329 }
1330
1331
1332
1333 /*************************************************
1334 * Receive message *
1335 *************************************************/
1336
1337 /* Receive a message on the given input, and put it into a pair of spool files.
1338 Either a non-null list of recipients, or the extract flag will be true, or
1339 both. The flag sender_local is true for locally generated messages. The flag
1340 submission_mode is true if an ACL has obeyed "control = submission". The flag
1341 suppress_local_fixups is true if an ACL has obeyed "control =
1342 suppress_local_fixups" or -G was passed on the command-line.
1343 The flag smtp_input is true if the message is to be
1344 handled using SMTP conventions about termination and lines starting with dots.
1345 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1346
1347 If a message was successfully read, message_id[0] will be non-zero.
1348
1349 The general actions of this function are:
1350
1351 . Read the headers of the message (if any) into a chain of store
1352 blocks.
1353
1354 . If there is a "sender:" header and the message is locally originated,
1355 throw it away, unless the caller is trusted, or unless
1356 active_local_sender_retain is set - which can only happen if
1357 active_local_from_check is false.
1358
1359 . If recipients are to be extracted from the message, build the
1360 recipients list from the headers, removing any that were on the
1361 original recipients list (unless extract_addresses_remove_arguments is
1362 false), and at the same time, remove any bcc header that may be present.
1363
1364 . Get the spool file for the data, sort out its unique name, open
1365 and lock it (but don't give it the name yet).
1366
1367 . Generate a "Message-Id" header if the message doesn't have one, for
1368 locally-originated messages.
1369
1370 . Generate a "Received" header.
1371
1372 . Ensure the recipients list is fully qualified and rewritten if necessary.
1373
1374 . If there are any rewriting rules, apply them to the sender address
1375 and also to the headers.
1376
1377 . If there is no from: header, generate one, for locally-generated messages
1378 and messages in "submission mode" only.
1379
1380 . If the sender is local, check that from: is correct, and if not, generate
1381 a Sender: header, unless message comes from a trusted caller, or this
1382 feature is disabled by active_local_from_check being false.
1383
1384 . If there is no "date" header, generate one, for locally-originated
1385 or submission mode messages only.
1386
1387 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1388 dot_ends mode, to the data file. Leave it open, to hold the lock.
1389
1390 . Write the envelope and the headers to a new file.
1391
1392 . Set the name for the header file; close it.
1393
1394 . Set the name for the data file; close it.
1395
1396 Because this function can potentially be called many times in a single
1397 SMTP connection, all store should be got by store_get(), so that it will be
1398 automatically retrieved after the message is accepted.
1399
1400 FUDGE: It seems that sites on the net send out messages with just LF
1401 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1402 we make the CRs optional in all cases.
1403
1404 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1405 new regime is now in place in which bare CRs in header lines are turned into LF
1406 followed by a space, so as not to terminate the header line.
1407
1408 February 2004: A bare LF in a header line in a message whose first line was
1409 terminated by CRLF is treated in the same way as a bare CR.
1410
1411 Arguments:
1412 extract_recip TRUE if recipients are to be extracted from the message's
1413 headers
1414
1415 Returns: TRUE there are more messages to be read (SMTP input)
1416 FALSE there are no more messages to be read (non-SMTP input
1417 or SMTP connection collapsed, or other failure)
1418
1419 When reading a message for filter testing, the returned value indicates
1420 whether the headers (which is all that is read) were terminated by '.' or
1421 not. */
1422
1423 BOOL
1424 receive_msg(BOOL extract_recip)
1425 {
1426 int i;
1427 int rc = FAIL;
1428 int msg_size = 0;
1429 int process_info_len = Ustrlen(process_info);
1430 int error_rc = (error_handling == ERRORS_SENDER)?
1431 errors_sender_rc : EXIT_FAILURE;
1432 int header_size = 256;
1433 int start, end, domain, size, sptr;
1434 int id_resolution;
1435 int had_zero = 0;
1436 int prevlines_length = 0;
1437
1438 register int ptr = 0;
1439
1440 BOOL contains_resent_headers = FALSE;
1441 BOOL extracted_ignored = FALSE;
1442 BOOL first_line_ended_crlf = TRUE_UNSET;
1443 BOOL smtp_yield = TRUE;
1444 BOOL yield = FALSE;
1445
1446 BOOL resents_exist = FALSE;
1447 uschar *resent_prefix = US"";
1448 uschar *blackholed_by = NULL;
1449 uschar *blackhole_log_msg = US"";
1450 int cutthrough_done = 0;
1451
1452 flock_t lock_data;
1453 error_block *bad_addresses = NULL;
1454
1455 uschar *frozen_by = NULL;
1456 uschar *queued_by = NULL;
1457
1458 uschar *errmsg, *s;
1459 struct stat statbuf;
1460
1461 /* Final message to give to SMTP caller, and messages from ACLs */
1462
1463 uschar *smtp_reply = NULL;
1464 uschar *user_msg, *log_msg;
1465
1466 /* Working header pointers */
1467
1468 header_line *h, *next;
1469
1470 /* Flags for noting the existence of certain headers (only one left) */
1471
1472 BOOL date_header_exists = FALSE;
1473
1474 /* Pointers to receive the addresses of headers whose contents we need. */
1475
1476 header_line *from_header = NULL;
1477 header_line *subject_header = NULL;
1478 header_line *msgid_header = NULL;
1479 header_line *received_header;
1480
1481 /* Variables for use when building the Received: header. */
1482
1483 uschar *timestamp;
1484 int tslen;
1485
1486 /* Release any open files that might have been cached while preparing to
1487 accept the message - e.g. by verifying addresses - because reading a message
1488 might take a fair bit of real time. */
1489
1490 search_tidyup();
1491
1492 /* Extracting the recipient list from an input file is incompatible with
1493 cutthrough delivery with the no-spool option. It shouldn't be possible
1494 to set up the combination, but just in case kill any ongoing connection. */
1495 if (extract_recip || !smtp_input)
1496 cancel_cutthrough_connection("not smtp input");
1497
1498 /* Initialize the chain of headers by setting up a place-holder for Received:
1499 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1500 pointing to the end of the chain to make adding headers simple. */
1501
1502 received_header = header_list = header_last = store_get(sizeof(header_line));
1503 header_list->next = NULL;
1504 header_list->type = htype_old;
1505 header_list->text = NULL;
1506 header_list->slen = 0;
1507
1508 /* Control block for the next header to be read. */
1509
1510 next = store_get(sizeof(header_line));
1511 next->text = store_get(header_size);
1512
1513 /* Initialize message id to be null (indicating no message read), and the
1514 header names list to be the normal list. Indicate there is no data file open
1515 yet, initialize the size and warning count, and deal with no size limit. */
1516
1517 message_id[0] = 0;
1518 data_file = NULL;
1519 data_fd = -1;
1520 spool_name[0] = 0;
1521 message_size = 0;
1522 warning_count = 0;
1523 received_count = 1; /* For the one we will add */
1524
1525 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1526
1527 /* While reading the message, the following counts are computed. */
1528
1529 message_linecount = body_linecount = body_zerocount =
1530 max_received_linelength = 0;
1531
1532 #ifndef DISABLE_DKIM
1533 /* Call into DKIM to set up the context. */
1534 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1535 #endif
1536
1537 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1538 ids, and fractions of a second are required. See the comments that precede the
1539 message id creation below. */
1540
1541 (void)gettimeofday(&message_id_tv, NULL);
1542
1543 /* For other uses of the received time we can operate with granularity of one
1544 second, and for that we use the global variable received_time. This is for
1545 things like ultimate message timeouts. */
1546
1547 received_time = message_id_tv.tv_sec;
1548
1549 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1550 happen in the smtp_getc() function when it refills its buffer. */
1551
1552 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1553
1554 /* If not SMTP input, timeout happens only if configured, and we just set a
1555 single timeout for the whole message. */
1556
1557 else if (receive_timeout > 0)
1558 {
1559 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1560 alarm(receive_timeout);
1561 }
1562
1563 /* SIGTERM and SIGINT are caught always. */
1564
1565 signal(SIGTERM, data_sigterm_sigint_handler);
1566 signal(SIGINT, data_sigterm_sigint_handler);
1567
1568 /* Header lines in messages are not supposed to be very long, though when
1569 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1570 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1571 storing the header, and extend this as necessary using string_cat().
1572
1573 To cope with total lunacies, impose an upper limit on the length of the header
1574 section of the message, as otherwise the store will fill up. We must also cope
1575 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1576 Folded header lines are joined into one string, leaving the '\n' characters
1577 inside them, so that writing them out reproduces the input.
1578
1579 Loop for each character of each header; the next structure for chaining the
1580 header is set up already, with ptr the offset of the next character in
1581 next->text. */
1582
1583 for (;;)
1584 {
1585 int ch = (receive_getc)();
1586
1587 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1588 SMTP must have a correct "." terminator. */
1589
1590 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1591 {
1592 smtp_reply = handle_lost_connection(US" (header)");
1593 smtp_yield = FALSE;
1594 goto TIDYUP; /* Skip to end of function */
1595 }
1596
1597 /* See if we are at the current header's size limit - there must be at least
1598 four bytes left. This allows for the new character plus a zero, plus two for
1599 extra insertions when we are playing games with dots and carriage returns. If
1600 we are at the limit, extend the text buffer. This could have been done
1601 automatically using string_cat() but because this is a tightish loop storing
1602 only one character at a time, we choose to do it inline. Normally
1603 store_extend() will be able to extend the block; only at the end of a big
1604 store block will a copy be needed. To handle the case of very long headers
1605 (and sometimes lunatic messages can have ones that are 100s of K long) we
1606 call store_release() for strings that have been copied - if the string is at
1607 the start of a block (and therefore the only thing in it, because we aren't
1608 doing any other gets), the block gets freed. We can only do this because we
1609 know there are no other calls to store_get() going on. */
1610
1611 if (ptr >= header_size - 4)
1612 {
1613 int oldsize = header_size;
1614 /* header_size += 256; */
1615 header_size *= 2;
1616 if (!store_extend(next->text, oldsize, header_size))
1617 {
1618 uschar *newtext = store_get(header_size);
1619 memcpy(newtext, next->text, ptr);
1620 store_release(next->text);
1621 next->text = newtext;
1622 }
1623 }
1624
1625 /* Cope with receiving a binary zero. There is dispute about whether
1626 these should be allowed in RFC 822 messages. The middle view is that they
1627 should not be allowed in headers, at least. Exim takes this attitude at
1628 the moment. We can't just stomp on them here, because we don't know that
1629 this line is a header yet. Set a flag to cause scanning later. */
1630
1631 if (ch == 0) had_zero++;
1632
1633 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1634 those from data files use just LF. Treat LF in local SMTP input as a
1635 terminator too. Treat EOF as a line terminator always. */
1636
1637 if (ch == EOF) goto EOL;
1638
1639 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1640 other MTAs accept this. We are therefore forced into this "liberalisation"
1641 too, so we accept LF as a line terminator whatever the source of the message.
1642 However, if the first line of the message ended with a CRLF, we treat a bare
1643 LF specially by inserting a white space after it to ensure that the header
1644 line is not terminated. */
1645
1646 if (ch == '\n')
1647 {
1648 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1649 else if (first_line_ended_crlf) receive_ungetc(' ');
1650 goto EOL;
1651 }
1652
1653 /* This is not the end of the line. If this is SMTP input and this is
1654 the first character in the line and it is a "." character, ignore it.
1655 This implements the dot-doubling rule, though header lines starting with
1656 dots aren't exactly common. They are legal in RFC 822, though. If the
1657 following is CRLF or LF, this is the line that that terminates the
1658 entire message. We set message_ended to indicate this has happened (to
1659 prevent further reading), and break out of the loop, having freed the
1660 empty header, and set next = NULL to indicate no data line. */
1661
1662 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1663 {
1664 ch = (receive_getc)();
1665 if (ch == '\r')
1666 {
1667 ch = (receive_getc)();
1668 if (ch != '\n')
1669 {
1670 receive_ungetc(ch);
1671 ch = '\r'; /* Revert to CR */
1672 }
1673 }
1674 if (ch == '\n')
1675 {
1676 message_ended = END_DOT;
1677 store_reset(next);
1678 next = NULL;
1679 break; /* End character-reading loop */
1680 }
1681
1682 /* For non-SMTP input, the dot at the start of the line was really a data
1683 character. What is now in ch is the following character. We guaranteed
1684 enough space for this above. */
1685
1686 if (!smtp_input)
1687 {
1688 next->text[ptr++] = '.';
1689 message_size++;
1690 }
1691 }
1692
1693 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1694 remember this case if this is the first line ending. */
1695
1696 if (ch == '\r')
1697 {
1698 ch = (receive_getc)();
1699 if (ch == '\n')
1700 {
1701 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1702 goto EOL;
1703 }
1704
1705 /* Otherwise, put back the character after CR, and turn the bare CR
1706 into LF SP. */
1707
1708 ch = (receive_ungetc)(ch);
1709 next->text[ptr++] = '\n';
1710 message_size++;
1711 ch = ' ';
1712 }
1713
1714 /* We have a data character for the header line. */
1715
1716 next->text[ptr++] = ch; /* Add to buffer */
1717 message_size++; /* Total message size so far */
1718
1719 /* Handle failure due to a humungously long header section. The >= allows
1720 for the terminating \n. Add what we have so far onto the headers list so
1721 that it gets reflected in any error message, and back up the just-read
1722 character. */
1723
1724 if (message_size >= header_maxsize)
1725 {
1726 next->text[ptr] = 0;
1727 next->slen = ptr;
1728 next->type = htype_other;
1729 next->next = NULL;
1730 header_last->next = next;
1731 header_last = next;
1732
1733 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1734 "%s (more than %d characters): message abandoned",
1735 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1736
1737 if (smtp_input)
1738 {
1739 smtp_reply = US"552 Message header is ridiculously long";
1740 receive_swallow_smtp();
1741 goto TIDYUP; /* Skip to end of function */
1742 }
1743
1744 else
1745 {
1746 give_local_error(ERRMESS_VLONGHEADER,
1747 string_sprintf("message header longer than %d characters received: "
1748 "message not accepted", header_maxsize), US"", error_rc, stdin,
1749 header_list->next);
1750 /* Does not return */
1751 }
1752 }
1753
1754 continue; /* With next input character */
1755
1756 /* End of header line reached */
1757
1758 EOL:
1759
1760 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1761
1762 receive_linecount++;
1763 message_linecount++;
1764
1765 /* Keep track of maximum line length */
1766
1767 if (ptr - prevlines_length > max_received_linelength)
1768 max_received_linelength = ptr - prevlines_length;
1769 prevlines_length = ptr + 1;
1770
1771 /* Now put in the terminating newline. There is always space for
1772 at least two more characters. */
1773
1774 next->text[ptr++] = '\n';
1775 message_size++;
1776
1777 /* A blank line signals the end of the headers; release the unwanted
1778 space and set next to NULL to indicate this. */
1779
1780 if (ptr == 1)
1781 {
1782 store_reset(next);
1783 next = NULL;
1784 break;
1785 }
1786
1787 /* There is data in the line; see if the next input character is a
1788 whitespace character. If it is, we have a continuation of this header line.
1789 There is always space for at least one character at this point. */
1790
1791 if (ch != EOF)
1792 {
1793 int nextch = (receive_getc)();
1794 if (nextch == ' ' || nextch == '\t')
1795 {
1796 next->text[ptr++] = nextch;
1797 message_size++;
1798 continue; /* Iterate the loop */
1799 }
1800 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1801 else ch = EOF; /* Cause main loop to exit at end */
1802 }
1803
1804 /* We have got to the real line end. Terminate the string and release store
1805 beyond it. If it turns out to be a real header, internal binary zeros will
1806 be squashed later. */
1807
1808 next->text[ptr] = 0;
1809 next->slen = ptr;
1810 store_reset(next->text + ptr + 1);
1811
1812 /* Check the running total size against the overall message size limit. We
1813 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1814 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1815 headers - the code to read the body will then also hit the buffer. */
1816
1817 if (message_size > thismessage_size_limit) break;
1818
1819 /* A line that is not syntactically correct for a header also marks
1820 the end of the headers. In this case, we leave next containing the
1821 first data line. This might actually be several lines because of the
1822 continuation logic applied above, but that doesn't matter.
1823
1824 It turns out that smail, and presumably sendmail, accept leading lines
1825 of the form
1826
1827 From ph10 Fri Jan 5 12:35 GMT 1996
1828
1829 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1830 find any documentation of this, but for compatibility it had better be
1831 accepted. Exim restricts it to the case of non-smtp messages, and
1832 treats it as an alternative to the -f command line option. Thus it is
1833 ignored except for trusted users or filter testing. Otherwise it is taken
1834 as the sender address, unless -f was used (sendmail compatibility).
1835
1836 It further turns out that some UUCPs generate the From_line in a different
1837 format, e.g.
1838
1839 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1840
1841 The regex for matching these things is now capable of recognizing both
1842 formats (including 2- and 4-digit years in the latter). In fact, the regex
1843 is now configurable, as is the expansion string to fish out the sender.
1844
1845 Even further on it has been discovered that some broken clients send
1846 these lines in SMTP messages. There is now an option to ignore them from
1847 specified hosts or networks. Sigh. */
1848
1849 if (header_last == header_list &&
1850 (!smtp_input
1851 ||
1852 (sender_host_address != NULL &&
1853 verify_check_host(&ignore_fromline_hosts) == OK)
1854 ||
1855 (sender_host_address == NULL && ignore_fromline_local)
1856 ) &&
1857 regex_match_and_setup(regex_From, next->text, 0, -1))
1858 {
1859 if (!sender_address_forced)
1860 {
1861 uschar *uucp_sender = expand_string(uucp_from_sender);
1862 if (uucp_sender == NULL)
1863 {
1864 log_write(0, LOG_MAIN|LOG_PANIC,
1865 "expansion of \"%s\" failed after matching "
1866 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1867 }
1868 else
1869 {
1870 int start, end, domain;
1871 uschar *errmess;
1872 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1873 &start, &end, &domain, TRUE);
1874 if (newsender != NULL)
1875 {
1876 if (domain == 0 && newsender[0] != 0)
1877 newsender = rewrite_address_qualify(newsender, FALSE);
1878
1879 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1880 {
1881 sender_address = newsender;
1882
1883 if (trusted_caller || filter_test != FTEST_NONE)
1884 {
1885 authenticated_sender = NULL;
1886 originator_name = US"";
1887 sender_local = FALSE;
1888 }
1889
1890 if (filter_test != FTEST_NONE)
1891 printf("Sender taken from \"From \" line\n");
1892 }
1893 }
1894 }
1895 }
1896 }
1897
1898 /* Not a leading "From " line. Check to see if it is a valid header line.
1899 Header names may contain any non-control characters except space and colon,
1900 amazingly. */
1901
1902 else
1903 {
1904 uschar *p = next->text;
1905
1906 /* If not a valid header line, break from the header reading loop, leaving
1907 next != NULL, indicating that it holds the first line of the body. */
1908
1909 if (isspace(*p)) break;
1910 while (mac_isgraph(*p) && *p != ':') p++;
1911 while (isspace(*p)) p++;
1912 if (*p != ':')
1913 {
1914 body_zerocount = had_zero;
1915 break;
1916 }
1917
1918 /* We have a valid header line. If there were any binary zeroes in
1919 the line, stomp on them here. */
1920
1921 if (had_zero > 0)
1922 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1923
1924 /* It is perfectly legal to have an empty continuation line
1925 at the end of a header, but it is confusing to humans
1926 looking at such messages, since it looks like a blank line.
1927 Reduce confusion by removing redundant white space at the
1928 end. We know that there is at least one printing character
1929 (the ':' tested for above) so there is no danger of running
1930 off the end. */
1931
1932 p = next->text + ptr - 2;
1933 for (;;)
1934 {
1935 while (*p == ' ' || *p == '\t') p--;
1936 if (*p != '\n') break;
1937 ptr = (p--) - next->text + 1;
1938 message_size -= next->slen - ptr;
1939 next->text[ptr] = 0;
1940 next->slen = ptr;
1941 }
1942
1943 /* Add the header to the chain */
1944
1945 next->type = htype_other;
1946 next->next = NULL;
1947 header_last->next = next;
1948 header_last = next;
1949
1950 /* Check the limit for individual line lengths. This comes after adding to
1951 the chain so that the failing line is reflected if a bounce is generated
1952 (for a local message). */
1953
1954 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1955 {
1956 log_write(0, LOG_MAIN, "overlong message header line received from "
1957 "%s (more than %d characters): message abandoned",
1958 sender_host_unknown? sender_ident : sender_fullhost,
1959 header_line_maxsize);
1960
1961 if (smtp_input)
1962 {
1963 smtp_reply = US"552 A message header line is too long";
1964 receive_swallow_smtp();
1965 goto TIDYUP; /* Skip to end of function */
1966 }
1967
1968 else
1969 {
1970 give_local_error(ERRMESS_VLONGHDRLINE,
1971 string_sprintf("message header line longer than %d characters "
1972 "received: message not accepted", header_line_maxsize), US"",
1973 error_rc, stdin, header_list->next);
1974 /* Does not return */
1975 }
1976 }
1977
1978 /* Note if any resent- fields exist. */
1979
1980 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1981 {
1982 resents_exist = TRUE;
1983 resent_prefix = US"Resent-";
1984 }
1985 }
1986
1987 /* The line has been handled. If we have hit EOF, break out of the loop,
1988 indicating no pending data line. */
1989
1990 if (ch == EOF) { next = NULL; break; }
1991
1992 /* Set up for the next header */
1993
1994 header_size = 256;
1995 next = store_get(sizeof(header_line));
1996 next->text = store_get(header_size);
1997 ptr = 0;
1998 had_zero = 0;
1999 prevlines_length = 0;
2000 } /* Continue, starting to read the next header */
2001
2002 /* At this point, we have read all the headers into a data structure in main
2003 store. The first header is still the dummy placeholder for the Received: header
2004 we are going to generate a bit later on. If next != NULL, it contains the first
2005 data line - which terminated the headers before reaching a blank line (not the
2006 normal case). */
2007
2008 DEBUG(D_receive)
2009 {
2010 debug_printf(">>Headers received:\n");
2011 for (h = header_list->next; h != NULL; h = h->next)
2012 debug_printf("%s", h->text);
2013 debug_printf("\n");
2014 }
2015
2016 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2017 is dropped immediately after valid headers, the next thing we will see is EOF.
2018 We must test for this specially, as further down the reading of the data is
2019 skipped if already at EOF. */
2020
2021 if (smtp_input && (receive_feof)())
2022 {
2023 smtp_reply = handle_lost_connection(US" (after header)");
2024 smtp_yield = FALSE;
2025 goto TIDYUP; /* Skip to end of function */
2026 }
2027
2028 /* If this is a filter test run and no headers were read, output a warning
2029 in case there is a mistake in the test message. */
2030
2031 if (filter_test != FTEST_NONE && header_list->next == NULL)
2032 printf("Warning: no message headers read\n");
2033
2034
2035 /* Scan the headers to identify them. Some are merely marked for later
2036 processing; some are dealt with here. */
2037
2038 for (h = header_list->next; h != NULL; h = h->next)
2039 {
2040 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2041 if (is_resent) contains_resent_headers = TRUE;
2042
2043 switch (header_checkname(h, is_resent))
2044 {
2045 case htype_bcc:
2046 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2047 break;
2048
2049 case htype_cc:
2050 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2051 break;
2052
2053 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2054
2055 case htype_date:
2056 if (!resents_exist || is_resent) date_header_exists = TRUE;
2057 break;
2058
2059 /* Same comments as about Return-Path: below. */
2060
2061 case htype_delivery_date:
2062 if (delivery_date_remove) h->type = htype_old;
2063 break;
2064
2065 /* Same comments as about Return-Path: below. */
2066
2067 case htype_envelope_to:
2068 if (envelope_to_remove) h->type = htype_old;
2069 break;
2070
2071 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2072 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2073 header consists of just the login id of the user who called Exim, rewrite
2074 it with the gecos field first. Apply this rule to Resent-From: if there
2075 are resent- fields. */
2076
2077 case htype_from:
2078 h->type = htype_from;
2079 if (!resents_exist || is_resent)
2080 {
2081 from_header = h;
2082 if (!smtp_input)
2083 {
2084 int len;
2085 uschar *s = Ustrchr(h->text, ':') + 1;
2086 while (isspace(*s)) s++;
2087 len = h->slen - (s - h->text) - 1;
2088 if (Ustrlen(originator_login) == len &&
2089 strncmpic(s, originator_login, len) == 0)
2090 {
2091 uschar *name = is_resent? US"Resent-From" : US"From";
2092 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2093 originator_login, qualify_domain_sender);
2094 from_header = header_last;
2095 h->type = htype_old;
2096 DEBUG(D_receive|D_rewrite)
2097 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2098 }
2099 }
2100 }
2101 break;
2102
2103 /* Identify the Message-id: header for generating "in-reply-to" in the
2104 autoreply transport. For incoming logging, save any resent- value. In both
2105 cases, take just the first of any multiples. */
2106
2107 case htype_id:
2108 if (msgid_header == NULL && (!resents_exist || is_resent))
2109 {
2110 msgid_header = h;
2111 h->type = htype_id;
2112 }
2113 break;
2114
2115 /* Flag all Received: headers */
2116
2117 case htype_received:
2118 h->type = htype_received;
2119 received_count++;
2120 break;
2121
2122 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2123
2124 case htype_reply_to:
2125 h->type = htype_reply_to;
2126 break;
2127
2128 /* The Return-path: header is supposed to be added to messages when
2129 they leave the SMTP system. We shouldn't receive messages that already
2130 contain Return-path. However, since Exim generates Return-path: on
2131 local delivery, resent messages may well contain it. We therefore
2132 provide an option (which defaults on) to remove any Return-path: headers
2133 on input. Removal actually means flagging as "old", which prevents the
2134 header being transmitted with the message. */
2135
2136 case htype_return_path:
2137 if (return_path_remove) h->type = htype_old;
2138
2139 /* If we are testing a mail filter file, use the value of the
2140 Return-Path: header to set up the return_path variable, which is not
2141 otherwise set. However, remove any <> that surround the address
2142 because the variable doesn't have these. */
2143
2144 if (filter_test != FTEST_NONE)
2145 {
2146 uschar *start = h->text + 12;
2147 uschar *end = start + Ustrlen(start);
2148 while (isspace(*start)) start++;
2149 while (end > start && isspace(end[-1])) end--;
2150 if (*start == '<' && end[-1] == '>')
2151 {
2152 start++;
2153 end--;
2154 }
2155 return_path = string_copyn(start, end - start);
2156 printf("Return-path taken from \"Return-path:\" header line\n");
2157 }
2158 break;
2159
2160 /* If there is a "Sender:" header and the message is locally originated,
2161 and from an untrusted caller and suppress_local_fixups is not set, or if we
2162 are in submission mode for a remote message, mark it "old" so that it will
2163 not be transmitted with the message, unless active_local_sender_retain is
2164 set. (This can only be true if active_local_from_check is false.) If there
2165 are any resent- headers in the message, apply this rule to Resent-Sender:
2166 instead of Sender:. Messages with multiple resent- header sets cannot be
2167 tidily handled. (For this reason, at least one MUA - Pine - turns old
2168 resent- headers into X-resent- headers when resending, leaving just one
2169 set.) */
2170
2171 case htype_sender:
2172 h->type = ((!active_local_sender_retain &&
2173 (
2174 (sender_local && !trusted_caller && !suppress_local_fixups)
2175 || submission_mode
2176 )
2177 ) &&
2178 (!resents_exist||is_resent))?
2179 htype_old : htype_sender;
2180 break;
2181
2182 /* Remember the Subject: header for logging. There is no Resent-Subject */
2183
2184 case htype_subject:
2185 subject_header = h;
2186 break;
2187
2188 /* "To:" gets flagged, and the existence of a recipient header is noted,
2189 whether it's resent- or not. */
2190
2191 case htype_to:
2192 h->type = htype_to;
2193 /****
2194 to_or_cc_header_exists = TRUE;
2195 ****/
2196 break;
2197 }
2198 }
2199
2200 /* Extract recipients from the headers if that is required (the -t option).
2201 Note that this is documented as being done *before* any address rewriting takes
2202 place. There are two possibilities:
2203
2204 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2205 recipients already listed are to be REMOVED from the message. Smail 3 works
2206 like this. We need to build a non-recipients tree for that list, because in
2207 subsequent processing this data is held in a tree and that's what the
2208 spool_write_header() function expects. Make sure that non-recipient addresses
2209 are fully qualified and rewritten if necessary.
2210
2211 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2212 those in the command line arguments (and it is rumoured some other MTAs do
2213 this). Therefore, there is an option to make Exim behave this way.
2214
2215 *** Notes on "Resent-" header lines ***
2216
2217 The presence of resent-headers in the message makes -t horribly ambiguous.
2218 Experiments with sendmail showed that it uses recipients for all resent-
2219 headers, totally ignoring the concept of "sets of resent- headers" as described
2220 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2221 with all the addresses in one instance of each header.
2222
2223 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2224 error for -t if there were resent- headers in the message. However, after a
2225 discussion on the mailing list, I've learned that there are MUAs that use
2226 resent- headers with -t, and also that the stuff about sets of resent- headers
2227 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2228 message with -t and resent- header lines makes sure that only *its* resent-
2229 headers are present; previous ones are often renamed as X-resent- for example.
2230
2231 Consequently, Exim has been changed so that, if any resent- header lines are
2232 present, the recipients are taken from all of the appropriate resent- lines,
2233 and not from the ordinary To:, Cc:, etc. */
2234
2235 if (extract_recip)
2236 {
2237 int rcount = 0;
2238 error_block **bnext = &bad_addresses;
2239
2240 if (extract_addresses_remove_arguments)
2241 {
2242 while (recipients_count-- > 0)
2243 {
2244 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2245 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2246 tree_add_nonrecipient(s);
2247 }
2248 recipients_list = NULL;
2249 recipients_count = recipients_list_max = 0;
2250 }
2251
2252 /* Now scan the headers */
2253
2254 for (h = header_list->next; h != NULL; h = h->next)
2255 {
2256 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2257 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2258 {
2259 uschar *s = Ustrchr(h->text, ':') + 1;
2260 while (isspace(*s)) s++;
2261
2262 parse_allow_group = TRUE; /* Allow address group syntax */
2263
2264 while (*s != 0)
2265 {
2266 uschar *ss = parse_find_address_end(s, FALSE);
2267 uschar *recipient, *errmess, *p, *pp;
2268 int start, end, domain;
2269
2270 /* Check on maximum */
2271
2272 if (recipients_max > 0 && ++rcount > recipients_max)
2273 {
2274 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2275 US"message rejected: ", error_rc, stdin, NULL);
2276 /* Does not return */
2277 }
2278
2279 /* Make a copy of the address, and remove any internal newlines. These
2280 may be present as a result of continuations of the header line. The
2281 white space that follows the newline must not be removed - it is part
2282 of the header. */
2283
2284 pp = recipient = store_get(ss - s + 1);
2285 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2286 *pp = 0;
2287 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2288 &domain, FALSE);
2289
2290 /* Keep a list of all the bad addresses so we can send a single
2291 error message at the end. However, an empty address is not an error;
2292 just ignore it. This can come from an empty group list like
2293
2294 To: Recipients of list:;
2295
2296 If there are no recipients at all, an error will occur later. */
2297
2298 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2299 {
2300 int len = Ustrlen(s);
2301 error_block *b = store_get(sizeof(error_block));
2302 while (len > 0 && isspace(s[len-1])) len--;
2303 b->next = NULL;
2304 b->text1 = string_printing(string_copyn(s, len));
2305 b->text2 = errmess;
2306 *bnext = b;
2307 bnext = &(b->next);
2308 }
2309
2310 /* If the recipient is already in the nonrecipients tree, it must
2311 have appeared on the command line with the option extract_addresses_
2312 remove_arguments set. Do not add it to the recipients, and keep a note
2313 that this has happened, in order to give a better error if there are
2314 no recipients left. */
2315
2316 else if (recipient != NULL)
2317 {
2318 if (tree_search(tree_nonrecipients, recipient) == NULL)
2319 receive_add_recipient(recipient, -1);
2320 else
2321 extracted_ignored = TRUE;
2322 }
2323
2324 /* Move on past this address */
2325
2326 s = ss + (*ss? 1:0);
2327 while (isspace(*s)) s++;
2328 } /* Next address */
2329
2330 parse_allow_group = FALSE; /* Reset group syntax flags */
2331 parse_found_group = FALSE;
2332
2333 /* If this was the bcc: header, mark it "old", which means it
2334 will be kept on the spool, but not transmitted as part of the
2335 message. */
2336
2337 if (h->type == htype_bcc) h->type = htype_old;
2338 } /* For appropriate header line */
2339 } /* For each header line */
2340
2341 }
2342
2343 /* Now build the unique message id. This has changed several times over the
2344 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2345 Retaining all the history in the comment has become too unwieldy - read
2346 previous release sources if you want it.
2347
2348 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2349 The first part is the current time, in seconds. The second part is the current
2350 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2351 can hold a number in the range 0-3843. It used to be a computed sequence
2352 number, but is now the fractional component of the current time in units of
2353 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2354 received, Exim ensures that the timer has ticked at the appropriate level
2355 before proceeding, to avoid duplication if the pid happened to be re-used
2356 within the same time period. It seems likely that most messages will take at
2357 least half a millisecond to be received, so no delay will normally be
2358 necessary. At least for some time...
2359
2360 There is a modification when localhost_number is set. Formerly this was allowed
2361 to be as large as 255. Now it is restricted to the range 0-16, and the final
2362 component of the message id becomes (localhost_number * 200) + fractional time
2363 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2364
2365 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2366 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2367 still allows the tttttt field to hold a large enough number to last for some
2368 more decades, and the final two-digit field can hold numbers up to 1295, which
2369 is enough for milliseconds (instead of 1/2000 of a second).
2370
2371 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2372 pid, so it is probably safe because pids have to be positive. The
2373 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2374 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2375
2376 Note that string_base62() returns its data in a static storage block, so it
2377 must be copied before calling string_base62() again. It always returns exactly
2378 6 characters.
2379
2380 There doesn't seem to be anything in the RFC which requires a message id to
2381 start with a letter, but Smail was changed to ensure this. The external form of
2382 the message id (as supplied by string expansion) therefore starts with an
2383 additional leading 'E'. The spool file names do not include this leading
2384 letter and it is not used internally.
2385
2386 NOTE: If ever the format of message ids is changed, the regular expression for
2387 checking that a string is in this format must be updated in a corresponding
2388 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2389 must also be changed to reflect the correct string length. Then, of course,
2390 other programs that rely on the message id format will need updating too. */
2391
2392 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2393 message_id[6] = '-';
2394 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2395
2396 /* Deal with the case where the host number is set. The value of the number was
2397 checked when it was read, to ensure it isn't too big. The timing granularity is
2398 left in id_resolution so that an appropriate wait can be done after receiving
2399 the message, if necessary (we hope it won't be). */
2400
2401 if (host_number_string != NULL)
2402 {
2403 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2404 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2405 string_base62((long int)(
2406 host_number * (1000000/id_resolution) +
2407 message_id_tv.tv_usec/id_resolution)) + 4);
2408 }
2409
2410 /* Host number not set: final field is just the fractional time at an
2411 appropriate resolution. */
2412
2413 else
2414 {
2415 id_resolution = (BASE_62 == 62)? 500 : 1000;
2416 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2417 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2418 }
2419
2420 /* Add the current message id onto the current process info string if
2421 it will fit. */
2422
2423 (void)string_format(process_info + process_info_len,
2424 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2425
2426 /* If we are using multiple input directories, set up the one for this message
2427 to be the least significant base-62 digit of the time of arrival. Otherwise
2428 ensure that it is an empty string. */
2429
2430 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2431
2432 /* Now that we have the message-id, if there is no message-id: header, generate
2433 one, but only for local (without suppress_local_fixups) or submission mode
2434 messages. This can be user-configured if required, but we had better flatten
2435 any illegal characters therein. */
2436
2437 if (msgid_header == NULL &&
2438 ((sender_host_address == NULL && !suppress_local_fixups)
2439 || submission_mode))
2440 {
2441 uschar *p;
2442 uschar *id_text = US"";
2443 uschar *id_domain = primary_hostname;
2444
2445 /* Permit only letters, digits, dots, and hyphens in the domain */
2446
2447 if (message_id_domain != NULL)
2448 {
2449 uschar *new_id_domain = expand_string(message_id_domain);
2450 if (new_id_domain == NULL)
2451 {
2452 if (!expand_string_forcedfail)
2453 log_write(0, LOG_MAIN|LOG_PANIC,
2454 "expansion of \"%s\" (message_id_header_domain) "
2455 "failed: %s", message_id_domain, expand_string_message);
2456 }
2457 else if (*new_id_domain != 0)
2458 {
2459 id_domain = new_id_domain;
2460 for (p = id_domain; *p != 0; p++)
2461 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2462 }
2463 }
2464
2465 /* Permit all characters except controls and RFC 2822 specials in the
2466 additional text part. */
2467
2468 if (message_id_text != NULL)
2469 {
2470 uschar *new_id_text = expand_string(message_id_text);
2471 if (new_id_text == NULL)
2472 {
2473 if (!expand_string_forcedfail)
2474 log_write(0, LOG_MAIN|LOG_PANIC,
2475 "expansion of \"%s\" (message_id_header_text) "
2476 "failed: %s", message_id_text, expand_string_message);
2477 }
2478 else if (*new_id_text != 0)
2479 {
2480 id_text = new_id_text;
2481 for (p = id_text; *p != 0; p++)
2482 if (mac_iscntrl_or_special(*p)) *p = '-';
2483 }
2484 }
2485
2486 /* Add the header line
2487 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2488 * appended, to preserve classical expectations of header ordering. */
2489
2490 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2491 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2492 (*id_text == 0)? "" : ".", id_text, id_domain);
2493 }
2494
2495 /* If we are to log recipients, keep a copy of the raw ones before any possible
2496 rewriting. Must copy the count, because later ACLs and the local_scan()
2497 function may mess with the real recipients. */
2498
2499 if ((log_extra_selector & LX_received_recipients) != 0)
2500 {
2501 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2502 for (i = 0; i < recipients_count; i++)
2503 raw_recipients[i] = string_copy(recipients_list[i].address);
2504 raw_recipients_count = recipients_count;
2505 }
2506
2507 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2508 recipients will get here only if the conditions were right (allow_unqualified_
2509 recipient is TRUE). */
2510
2511 for (i = 0; i < recipients_count; i++)
2512 recipients_list[i].address =
2513 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2514 global_rewrite_rules, rewrite_existflags);
2515
2516 /* If there is no From: header, generate one for local (without
2517 suppress_local_fixups) or submission_mode messages. If there is no sender
2518 address, but the sender is local or this is a local delivery error, use the
2519 originator login. This shouldn't happen for genuine bounces, but might happen
2520 for autoreplies. The addition of From: must be done *before* checking for the
2521 possible addition of a Sender: header, because untrusted_set_sender allows an
2522 untrusted user to set anything in the envelope (which might then get info
2523 From:) but we still want to ensure a valid Sender: if it is required. */
2524
2525 if (from_header == NULL &&
2526 ((sender_host_address == NULL && !suppress_local_fixups)
2527 || submission_mode))
2528 {
2529 uschar *oname = US"";
2530
2531 /* Use the originator_name if this is a locally submitted message and the
2532 caller is not trusted. For trusted callers, use it only if -F was used to
2533 force its value or if we have a non-SMTP message for which -f was not used
2534 to set the sender. */
2535
2536 if (sender_host_address == NULL)
2537 {
2538 if (!trusted_caller || sender_name_forced ||
2539 (!smtp_input && !sender_address_forced))
2540 oname = originator_name;
2541 }
2542
2543 /* For non-locally submitted messages, the only time we use the originator
2544 name is when it was forced by the /name= option on control=submission. */
2545
2546 else
2547 {
2548 if (submission_name != NULL) oname = submission_name;
2549 }
2550
2551 /* Envelope sender is empty */
2552
2553 if (sender_address[0] == 0)
2554 {
2555 uschar *fromstart, *fromend;
2556
2557 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2558 oname, (oname[0] == 0)? "" : " <");
2559 fromend = (oname[0] == 0)? US"" : US">";
2560
2561 if (sender_local || local_error_message)
2562 {
2563 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2564 local_part_quote(originator_login), qualify_domain_sender,
2565 fromend);
2566 }
2567 else if (submission_mode && authenticated_id != NULL)
2568 {
2569 if (submission_domain == NULL)
2570 {
2571 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2572 local_part_quote(authenticated_id), qualify_domain_sender,
2573 fromend);
2574 }
2575 else if (submission_domain[0] == 0) /* empty => whole address set */
2576 {
2577 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2578 fromend);
2579 }
2580 else
2581 {
2582 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2583 local_part_quote(authenticated_id), submission_domain,
2584 fromend);
2585 }
2586 from_header = header_last; /* To get it checked for Sender: */
2587 }
2588 }
2589
2590 /* There is a non-null envelope sender. Build the header using the original
2591 sender address, before any rewriting that might have been done while
2592 verifying it. */
2593
2594 else
2595 {
2596 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2597 oname,
2598 (oname[0] == 0)? "" : " <",
2599 (sender_address_unrewritten == NULL)?
2600 sender_address : sender_address_unrewritten,
2601 (oname[0] == 0)? "" : ">");
2602
2603 from_header = header_last; /* To get it checked for Sender: */
2604 }
2605 }
2606
2607
2608 /* If the sender is local (without suppress_local_fixups), or if we are in
2609 submission mode and there is an authenticated_id, check that an existing From:
2610 is correct, and if not, generate a Sender: header, unless disabled. Any
2611 previously-existing Sender: header was removed above. Note that sender_local,
2612 as well as being TRUE if the caller of exim is not trusted, is also true if a
2613 trusted caller did not supply a -f argument for non-smtp input. To allow
2614 trusted callers to forge From: without supplying -f, we have to test explicitly
2615 here. If the From: header contains more than one address, then the call to
2616 parse_extract_address fails, and a Sender: header is inserted, as required. */
2617
2618 if (from_header != NULL &&
2619 (active_local_from_check &&
2620 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2621 (submission_mode && authenticated_id != NULL))
2622 ))
2623 {
2624 BOOL make_sender = TRUE;
2625 int start, end, domain;
2626 uschar *errmess;
2627 uschar *from_address =
2628 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2629 &start, &end, &domain, FALSE);
2630 uschar *generated_sender_address;
2631
2632 if (submission_mode)
2633 {
2634 if (submission_domain == NULL)
2635 {
2636 generated_sender_address = string_sprintf("%s@%s",
2637 local_part_quote(authenticated_id), qualify_domain_sender);
2638 }
2639 else if (submission_domain[0] == 0) /* empty => full address */
2640 {
2641 generated_sender_address = string_sprintf("%s",
2642 authenticated_id);
2643 }
2644 else
2645 {
2646 generated_sender_address = string_sprintf("%s@%s",
2647 local_part_quote(authenticated_id), submission_domain);
2648 }
2649 }
2650 else
2651 generated_sender_address = string_sprintf("%s@%s",
2652 local_part_quote(originator_login), qualify_domain_sender);
2653
2654 /* Remove permitted prefixes and suffixes from the local part of the From:
2655 address before doing the comparison with the generated sender. */
2656
2657 if (from_address != NULL)
2658 {
2659 int slen;
2660 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2661
2662 if (at != NULL) *at = 0;
2663 from_address += route_check_prefix(from_address, local_from_prefix);
2664 slen = route_check_suffix(from_address, local_from_suffix);
2665 if (slen > 0)
2666 {
2667 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2668 from_address += slen;
2669 }
2670 if (at != NULL) *at = '@';
2671
2672 if (strcmpic(generated_sender_address, from_address) == 0 ||
2673 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2674 make_sender = FALSE;
2675 }
2676
2677 /* We have to cause the Sender header to be rewritten if there are
2678 appropriate rewriting rules. */
2679
2680 if (make_sender)
2681 {
2682 if (submission_mode && submission_name == NULL)
2683 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2684 generated_sender_address);
2685 else
2686 header_add(htype_sender, "%sSender: %s <%s>\n",
2687 resent_prefix,
2688 submission_mode? submission_name : originator_name,
2689 generated_sender_address);
2690 }
2691
2692 /* Ensure that a non-null envelope sender address corresponds to the
2693 submission mode sender address. */
2694
2695 if (submission_mode && sender_address[0] != 0)
2696 {
2697 if (sender_address_unrewritten == NULL)
2698 sender_address_unrewritten = sender_address;
2699 sender_address = generated_sender_address;
2700 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2701 log_write(L_address_rewrite, LOG_MAIN,
2702 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2703 sender_address_unrewritten, generated_sender_address);
2704 }
2705 }
2706
2707
2708 /* If there are any rewriting rules, apply them to the sender address, unless
2709 it has already been rewritten as part of verification for SMTP input. */
2710
2711 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2712 sender_address[0] != 0)
2713 {
2714 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2715 global_rewrite_rules, rewrite_existflags);
2716 DEBUG(D_receive|D_rewrite)
2717 debug_printf("rewritten sender = %s\n", sender_address);
2718 }
2719
2720
2721 /* The headers must be run through rewrite_header(), because it ensures that
2722 addresses are fully qualified, as well as applying any rewriting rules that may
2723 exist.
2724
2725 Qualification of header addresses in a message from a remote host happens only
2726 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2727 appropriate. For local messages, qualification always happens, unless -bnq is
2728 used to explicitly suppress it. No rewriting is done for an unqualified address
2729 that is left untouched.
2730
2731 We start at the second header, skipping our own Received:. This rewriting is
2732 documented as happening *after* recipient addresses are taken from the headers
2733 by the -t command line option. An added Sender: gets rewritten here. */
2734
2735 for (h = header_list->next; h != NULL; h = h->next)
2736 {
2737 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2738 rewrite_existflags, TRUE);
2739 if (newh != NULL) h = newh;
2740 }
2741
2742
2743 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2744 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2745 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2746 exists, this applies to the set of resent- headers rather than the normal set.
2747
2748 The requirement for a recipient header has been removed in RFC 2822. At this
2749 point in the code, earlier versions of Exim added a To: header for locally
2750 submitted messages, and an empty Bcc: header for others. In the light of the
2751 changes in RFC 2822, this was dropped in November 2003. */
2752
2753
2754 /* If there is no date header, generate one if the message originates locally
2755 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2756 submission mode flag is set. Messages without Date: are not valid, but it seems
2757 to be more confusing if Exim adds one to all remotely-originated messages.
2758 As per Message-Id, we prepend if resending, else append.
2759 */
2760
2761 if (!date_header_exists &&
2762 ((sender_host_address == NULL && !suppress_local_fixups)
2763 || submission_mode))
2764 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2765 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2766
2767 search_tidyup(); /* Free any cached resources */
2768
2769 /* Show the complete set of headers if debugging. Note that the first one (the
2770 new Received:) has not yet been set. */
2771
2772 DEBUG(D_receive)
2773 {
2774 debug_printf(">>Headers after rewriting and local additions:\n");
2775 for (h = header_list->next; h != NULL; h = h->next)
2776 debug_printf("%c %s", h->type, h->text);
2777 debug_printf("\n");
2778 }
2779
2780 /* The headers are now complete in store. If we are running in filter
2781 testing mode, that is all this function does. Return TRUE if the message
2782 ended with a dot. */
2783
2784 if (filter_test != FTEST_NONE)
2785 {
2786 process_info[process_info_len] = 0;
2787 return message_ended == END_DOT;
2788 }
2789
2790 /* Cutthrough delivery:
2791 We have to create the Received header now rather than at the end of reception,
2792 so the timestamp behaviour is a change to the normal case.
2793 XXX Ensure this gets documented XXX.
2794 Having created it, send the headers to the destination.
2795 */
2796 if (cutthrough_fd >= 0)
2797 {
2798 if (received_count > received_headers_max)
2799 {
2800 cancel_cutthrough_connection("too many headers");
2801 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2802 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2803 "Too many \"Received\" headers",
2804 sender_address,
2805 (sender_fullhost == NULL)? "" : " H=",
2806 (sender_fullhost == NULL)? US"" : sender_fullhost,
2807 (sender_ident == NULL)? "" : " U=",
2808 (sender_ident == NULL)? US"" : sender_ident);
2809 message_id[0] = 0; /* Indicate no message accepted */
2810 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2811 goto TIDYUP; /* Skip to end of function */
2812 }
2813 received_header_gen();
2814 add_acl_headers(US"MAIL or RCPT");
2815 (void) cutthrough_headers_send();
2816 }
2817
2818
2819 /* Open a new spool file for the data portion of the message. We need
2820 to access it both via a file descriptor and a stream. Try to make the
2821 directory if it isn't there. Note re use of sprintf: spool_directory
2822 is checked on input to be < 200 characters long. */
2823
2824 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2825 message_id);
2826 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2827 if (data_fd < 0)
2828 {
2829 if (errno == ENOENT)
2830 {
2831 uschar temp[16];
2832 sprintf(CS temp, "input/%s", message_subdir);
2833 if (message_subdir[0] == 0) temp[5] = 0;
2834 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2835 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2836 }
2837 if (data_fd < 0)
2838 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2839 spool_name, strerror(errno));
2840 }
2841
2842 /* Make sure the file's group is the Exim gid, and double-check the mode
2843 because the group setting doesn't always get set automatically. */
2844
2845 if (fchown(data_fd, exim_uid, exim_gid))
2846 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2847 "Failed setting ownership on spool file %s: %s",
2848 spool_name, strerror(errno));
2849 (void)fchmod(data_fd, SPOOL_MODE);
2850
2851 /* We now have data file open. Build a stream for it and lock it. We lock only
2852 the first line of the file (containing the message ID) because otherwise there
2853 are problems when Exim is run under Cygwin (I'm told). See comments in
2854 spool_in.c, where the same locking is done. */
2855
2856 data_file = fdopen(data_fd, "w+");
2857 lock_data.l_type = F_WRLCK;
2858 lock_data.l_whence = SEEK_SET;
2859 lock_data.l_start = 0;
2860 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2861
2862 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2863 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2864 errno, strerror(errno));
2865
2866 /* We have an open, locked data file. Write the message id to it to make it
2867 self-identifying. Then read the remainder of the input of this message and
2868 write it to the data file. If the variable next != NULL, it contains the first
2869 data line (which was read as a header but then turned out not to have the right
2870 format); write it (remembering that it might contain binary zeros). The result
2871 of fwrite() isn't inspected; instead we call ferror() below. */
2872
2873 fprintf(data_file, "%s-D\n", message_id);
2874 if (next != NULL)
2875 {
2876 uschar *s = next->text;
2877 int len = next->slen;
2878 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2879 body_linecount++; /* Assumes only 1 line */
2880 }
2881
2882 /* Note that we might already be at end of file, or the logical end of file
2883 (indicated by '.'), or might have encountered an error while writing the
2884 message id or "next" line. */
2885
2886 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2887 {
2888 if (smtp_input)
2889 {
2890 message_ended = read_message_data_smtp(data_file);
2891 receive_linecount++; /* The terminating "." line */
2892 }
2893 else message_ended = read_message_data(data_file);
2894
2895 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2896 message_linecount += body_linecount;
2897
2898 /* Handle premature termination of SMTP */
2899
2900 if (smtp_input && message_ended == END_EOF)
2901 {
2902 Uunlink(spool_name); /* Lose data file when closed */
2903 cancel_cutthrough_connection("sender closed connection");
2904 message_id[0] = 0; /* Indicate no message accepted */
2905 smtp_reply = handle_lost_connection(US"");
2906 smtp_yield = FALSE;
2907 goto TIDYUP; /* Skip to end of function */
2908 }
2909
2910 /* Handle message that is too big. Don't use host_or_ident() in the log
2911 message; we want to see the ident value even for non-remote messages. */
2912
2913 if (message_ended == END_SIZE)
2914 {
2915 Uunlink(spool_name); /* Lose the data file when closed */
2916 cancel_cutthrough_connection("mail too big");
2917 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2918
2919 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2920 "message too big: read=%d max=%d",
2921 sender_address,
2922 (sender_fullhost == NULL)? "" : " H=",
2923 (sender_fullhost == NULL)? US"" : sender_fullhost,
2924 (sender_ident == NULL)? "" : " U=",
2925 (sender_ident == NULL)? US"" : sender_ident,
2926 message_size,
2927 thismessage_size_limit);
2928
2929 if (smtp_input)
2930 {
2931 smtp_reply = US"552 Message size exceeds maximum permitted";
2932 message_id[0] = 0; /* Indicate no message accepted */
2933 goto TIDYUP; /* Skip to end of function */
2934 }
2935 else
2936 {
2937 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2938 give_local_error(ERRMESS_TOOBIG,
2939 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2940 US"message rejected: ", error_rc, data_file, header_list);
2941 /* Does not return */
2942 }
2943 }
2944 }
2945
2946 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2947 example, there may be some expansion in an ACL that uses a timer.) */
2948
2949 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2950
2951 /* The message body has now been read into the data file. Call fflush() to
2952 empty the buffers in C, and then call fsync() to get the data written out onto
2953 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2954 having to do this). If there was an I/O error on either input or output,
2955 attempt to send an error message, and unlink the spool file. For non-SMTP input
2956 we can then give up. Note that for SMTP input we must swallow the remainder of
2957 the input in cases of output errors, since the far end doesn't expect to see
2958 anything until the terminating dot line is sent. */
2959
2960 if (fflush(data_file) == EOF || ferror(data_file) ||
2961 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2962 {
2963 uschar *msg_errno = US strerror(errno);
2964 BOOL input_error = (receive_ferror)() != 0;
2965 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2966 input_error? "Input read" : "Spool write",
2967 msg_errno,
2968 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2969
2970 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2971 Uunlink(spool_name); /* Lose the data file */
2972 cancel_cutthrough_connection("error writing spoolfile");
2973
2974 if (smtp_input)
2975 {
2976 if (input_error)
2977 smtp_reply = US"451 Error while reading input data";
2978 else
2979 {
2980 smtp_reply = US"451 Error while writing spool file";
2981 receive_swallow_smtp();
2982 }
2983 message_id[0] = 0; /* Indicate no message accepted */
2984 goto TIDYUP; /* Skip to end of function */
2985 }
2986
2987 else
2988 {
2989 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2990 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2991 header_list);
2992 /* Does not return */
2993 }
2994 }
2995
2996
2997 /* No I/O errors were encountered while writing the data file. */
2998
2999 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3000
3001
3002 /* If there were any bad addresses extracted by -t, or there were no recipients
3003 left after -t, send a message to the sender of this message, or write it to
3004 stderr if the error handling option is set that way. Note that there may
3005 legitimately be no recipients for an SMTP message if they have all been removed
3006 by "discard".
3007
3008 We need to rewind the data file in order to read it. In the case of no
3009 recipients or stderr error writing, throw the data file away afterwards, and
3010 exit. (This can't be SMTP, which always ensures there's at least one
3011 syntactically good recipient address.) */
3012
3013 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3014 {
3015 DEBUG(D_receive)
3016 {
3017 if (recipients_count == 0) debug_printf("*** No recipients\n");
3018 if (bad_addresses != NULL)
3019 {
3020 error_block *eblock = bad_addresses;
3021 debug_printf("*** Bad address(es)\n");
3022 while (eblock != NULL)
3023 {
3024 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3025 eblock = eblock->next;
3026 }
3027 }
3028 }
3029
3030 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3031
3032 /* If configured to send errors to the sender, but this fails, force
3033 a failure error code. We use a special one for no recipients so that it
3034 can be detected by the autoreply transport. Otherwise error_rc is set to
3035 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3036 it is EXIT_SUCCESS. */
3037
3038 if (error_handling == ERRORS_SENDER)
3039 {
3040 if (!moan_to_sender(
3041 (bad_addresses == NULL)?
3042 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3043 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3044 bad_addresses, header_list, data_file, FALSE))
3045 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3046 }
3047 else
3048 {
3049 if (bad_addresses == NULL)
3050 {
3051 if (extracted_ignored)
3052 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3053 else
3054 fprintf(stderr, "exim: no recipients in message\n");
3055 }
3056 else
3057 {
3058 fprintf(stderr, "exim: invalid address%s",
3059 (bad_addresses->next == NULL)? ":" : "es:\n");
3060 while (bad_addresses != NULL)
3061 {
3062 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3063 bad_addresses->text2);
3064 bad_addresses = bad_addresses->next;
3065 }
3066 }
3067 }
3068
3069 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3070 {
3071 Uunlink(spool_name);
3072 (void)fclose(data_file);
3073 exim_exit(error_rc);
3074 }
3075 }
3076
3077 /* Data file successfully written. Generate text for the Received: header by
3078 expanding the configured string, and adding a timestamp. By leaving this
3079 operation till now, we ensure that the timestamp is the time that message
3080 reception was completed. However, this is deliberately done before calling the
3081 data ACL and local_scan().
3082
3083 This Received: header may therefore be inspected by the data ACL and by code in
3084 the local_scan() function. When they have run, we update the timestamp to be
3085 the final time of reception.
3086
3087 If there is just one recipient, set up its value in the $received_for variable
3088 for use when we generate the Received: header.
3089
3090 Note: the checking for too many Received: headers is handled by the delivery
3091 code. */
3092 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3093
3094 if (received_header->text == NULL) /* Non-cutthrough case */
3095 {
3096 received_header_gen();
3097
3098 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3099
3100 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3101 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3102
3103 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3104 now, before running the DATA ACL. */
3105
3106 add_acl_headers(US"MAIL or RCPT");
3107 }
3108 else
3109 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3110 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3111
3112 /* If an ACL is specified for checking things at this stage of reception of a
3113 message, run it, unless all the recipients were removed by "discard" in earlier
3114 ACLs. That is the only case in which recipients_count can be zero at this
3115 stage. Set deliver_datafile to point to the data file so that $message_body and
3116 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3117 */
3118
3119 deliver_datafile = data_fd;
3120 user_msg = NULL;
3121
3122 enable_dollar_recipients = TRUE;
3123
3124 if (recipients_count == 0)
3125 {
3126 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3127 }
3128 else
3129 {
3130 /* Handle interactive SMTP messages */
3131
3132 if (smtp_input && !smtp_batched_input)
3133 {
3134
3135 #ifndef DISABLE_DKIM
3136 if (!dkim_disable_verify)
3137 {
3138 /* Finish verification, this will log individual signature results to
3139 the mainlog */
3140 dkim_exim_verify_finish();
3141
3142 /* Check if we must run the DKIM ACL */
3143 if ((acl_smtp_dkim != NULL) &&
3144 (dkim_verify_signers != NULL) &&
3145 (dkim_verify_signers[0] != '\0'))
3146 {
3147 uschar *dkim_verify_signers_expanded =
3148 expand_string(dkim_verify_signers);
3149 if (dkim_verify_signers_expanded == NULL)
3150 {
3151 log_write(0, LOG_MAIN|LOG_PANIC,
3152 "expansion of dkim_verify_signers option failed: %s",
3153 expand_string_message);
3154 }
3155 else
3156 {
3157 int sep = 0;
3158 uschar *ptr = dkim_verify_signers_expanded;
3159 uschar *item = NULL;
3160 uschar *seen_items = NULL;
3161 int seen_items_size = 0;
3162 int seen_items_offset = 0;
3163 uschar itembuf[256];
3164 /* Default to OK when no items are present */
3165 rc = OK;
3166 while ((item = string_nextinlist(&ptr, &sep,
3167 itembuf,
3168 sizeof(itembuf))) != NULL)
3169 {
3170 /* Prevent running ACL for an empty item */
3171 if (!item || (item[0] == '\0')) continue;
3172 /* Only run ACL once for each domain or identity, no matter how often it
3173 appears in the expanded list. */
3174 if (seen_items != NULL)
3175 {
3176 uschar *seen_item = NULL;
3177 uschar seen_item_buf[256];
3178 uschar *seen_items_list = seen_items;
3179 int seen_this_item = 0;
3180
3181 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3182 seen_item_buf,
3183 sizeof(seen_item_buf))) != NULL)
3184 {
3185 if (Ustrcmp(seen_item,item) == 0)
3186 {
3187 seen_this_item = 1;
3188 break;
3189 }
3190 }
3191
3192 if (seen_this_item > 0)
3193 {
3194 DEBUG(D_receive)
3195 debug_printf("acl_smtp_dkim: skipping signer %s, already seen\n", item);
3196 continue;
3197 }
3198
3199 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,":");
3200 }
3201
3202 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,item);
3203 seen_items[seen_items_offset] = '\0';
3204
3205 DEBUG(D_receive)
3206 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n", item);
3207
3208 dkim_exim_acl_setup(item);
3209 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, &user_msg, &log_msg);
3210
3211 if (rc != OK)
3212 {
3213 DEBUG(D_receive)
3214 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, skipping remaining items\n", rc, item);
3215 cancel_cutthrough_connection("dkim acl not ok");
3216 break;
3217 }
3218 }
3219 add_acl_headers(US"DKIM");
3220 if (rc == DISCARD)
3221 {
3222 recipients_count = 0;
3223 blackholed_by = US"DKIM ACL";
3224 if (log_msg != NULL)
3225 blackhole_log_msg = string_sprintf(": %s", log_msg);
3226 }
3227 else if (rc != OK)
3228 {
3229 Uunlink(spool_name);
3230 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3231 smtp_yield = FALSE; /* No more messsages after dropped connection */
3232 smtp_reply = US""; /* Indicate reply already sent */
3233 message_id[0] = 0; /* Indicate no message accepted */
3234 goto TIDYUP; /* Skip to end of function */
3235 }
3236 }
3237 }
3238 }
3239 #endif /* DISABLE_DKIM */
3240
3241 #ifdef WITH_CONTENT_SCAN
3242 if (recipients_count > 0 &&
3243 acl_smtp_mime != NULL &&
3244 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3245 goto TIDYUP;
3246 #endif /* WITH_CONTENT_SCAN */
3247
3248 #ifdef EXPERIMENTAL_PRDR
3249 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr != NULL )
3250 {
3251 unsigned int c;
3252 int all_pass = OK;
3253 int all_fail = FAIL;
3254
3255 smtp_printf("353 PRDR content analysis beginning\r\n");
3256 /* Loop through recipients, responses must be in same order received */
3257 for (c = 0; recipients_count > c; c++)
3258 {
3259 uschar * addr= recipients_list[c].address;
3260 uschar * msg= US"PRDR R=<%s> %s";
3261 uschar * code;
3262 DEBUG(D_receive)
3263 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3264 addr, c+1, recipients_count);
3265 rc = acl_check(ACL_WHERE_PRDR, addr,
3266 acl_smtp_data_prdr, &user_msg, &log_msg);
3267
3268 /* If any recipient rejected content, indicate it in final message */
3269 all_pass |= rc;
3270 /* If all recipients rejected, indicate in final message */
3271 all_fail &= rc;
3272
3273 switch (rc)
3274 {
3275 case OK: case DISCARD: code = US"250"; break;
3276 case DEFER: code = US"450"; break;
3277 default: code = US"550"; break;
3278 }
3279 if (user_msg != NULL)
3280 smtp_user_msg(code, user_msg);
3281 else
3282 {
3283 switch (rc)
3284 {
3285 case OK: case DISCARD:
3286 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3287 case DEFER:
3288 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3289 default:
3290 msg = string_sprintf(CS msg, addr, "refusal"); break;
3291 }
3292 smtp_user_msg(code, msg);
3293 }
3294 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3295 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3296 else log_write(0, LOG_MAIN, CS msg);
3297
3298 if (rc != OK) { receive_remove_recipient(addr); c--; }
3299 }
3300 /* Set up final message, used if data acl gives OK */
3301 smtp_reply = string_sprintf("%s id=%s message %s",
3302 all_fail == FAIL ? US"550" : US"250",
3303 message_id,
3304 all_fail == FAIL
3305 ? US"rejected for all recipients"
3306 : all_pass == OK
3307 ? US"accepted"
3308 : US"accepted for some recipients");
3309 if (recipients_count == 0)
3310 {
3311 message_id[0] = 0; /* Indicate no message accepted */
3312 goto TIDYUP;
3313 }
3314 }
3315 else
3316 prdr_requested = FALSE;
3317 #endif /* EXPERIMENTAL_PRDR */
3318
3319 /* Check the recipients count again, as the MIME ACL might have changed
3320 them. */
3321
3322 if (acl_smtp_data != NULL && recipients_count > 0)
3323 {
3324 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3325 add_acl_headers(US"DATA");
3326 if (rc == DISCARD)
3327 {
3328 recipients_count = 0;
3329 blackholed_by = US"DATA ACL";
3330 if (log_msg != NULL)
3331 blackhole_log_msg = string_sprintf(": %s", log_msg);
3332 cancel_cutthrough_connection("data acl discard");
3333 }
3334 else if (rc != OK)
3335 {
3336 Uunlink(spool_name);
3337 cancel_cutthrough_connection("data acl not ok");
3338 #ifdef WITH_CONTENT_SCAN
3339 unspool_mbox();
3340 #endif
3341 #ifdef EXPERIMENTAL_DCC
3342 dcc_ok = 0;
3343 #endif
3344 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3345 smtp_yield = FALSE; /* No more messsages after dropped connection */
3346 smtp_reply = US""; /* Indicate reply already sent */
3347 message_id[0] = 0; /* Indicate no message accepted */
3348 goto TIDYUP; /* Skip to end of function */
3349 }
3350 }
3351 }
3352
3353 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3354 we cannot take different actions for permanent and temporary rejections. */
3355
3356 else
3357 {
3358
3359 #ifdef WITH_CONTENT_SCAN
3360 if (acl_not_smtp_mime != NULL &&
3361 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3362 &blackholed_by))
3363 goto TIDYUP;
3364 #endif /* WITH_CONTENT_SCAN */
3365
3366 if (acl_not_smtp != NULL)
3367 {
3368 uschar *user_msg, *log_msg;
3369 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3370 if (rc == DISCARD)
3371 {
3372 recipients_count = 0;
3373 blackholed_by = US"non-SMTP ACL";
3374 if (log_msg != NULL)
3375 blackhole_log_msg = string_sprintf(": %s", log_msg);
3376 }
3377 else if (rc != OK)
3378 {
3379 Uunlink(spool_name);
3380 #ifdef WITH_CONTENT_SCAN
3381 unspool_mbox();
3382 #endif
3383 #ifdef EXPERIMENTAL_DCC
3384 dcc_ok = 0;
3385 #endif
3386 /* The ACL can specify where rejections are to be logged, possibly
3387 nowhere. The default is main and reject logs. */
3388
3389 if (log_reject_target != 0)
3390 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3391 sender_address, log_msg);
3392
3393 if (user_msg == NULL) user_msg = US"local configuration problem";
3394 if (smtp_batched_input)
3395 {
3396 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3397 /* Does not return */
3398 }
3399 else
3400 {
3401 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3402 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3403 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3404 header_list);
3405 /* Does not return */
3406 }
3407 }
3408 add_acl_headers(US"non-SMTP");
3409 }
3410 }
3411
3412 /* The applicable ACLs have been run */
3413
3414 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3415 if (queue_only_policy) queued_by = US"ACL";
3416 }
3417
3418 #ifdef WITH_CONTENT_SCAN
3419 unspool_mbox();
3420 #endif
3421
3422 #ifdef EXPERIMENTAL_DCC
3423 dcc_ok = 0;
3424 #endif
3425
3426
3427 /* The final check on the message is to run the scan_local() function. The
3428 version supplied with Exim always accepts, but this is a hook for sysadmins to
3429 supply their own checking code. The local_scan() function is run even when all
3430 the recipients have been discarded. */
3431
3432 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3433
3434 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3435 deleted, and the incident gets logged. */
3436
3437 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3438 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3439 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3440 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3441
3442 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3443 local_scan_timeout);
3444 local_scan_data = NULL;
3445
3446 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3447 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3448 rc = local_scan(data_fd, &local_scan_data);
3449 alarm(0);
3450 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3451
3452 enable_dollar_recipients = FALSE;
3453
3454 store_pool = POOL_MAIN; /* In case changed */
3455 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3456 local_scan_data);
3457
3458 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3459 os_non_restarting_signal(SIGFPE, SIG_DFL);
3460 os_non_restarting_signal(SIGILL, SIG_DFL);
3461 os_non_restarting_signal(SIGBUS, SIG_DFL);
3462
3463 /* The length check is paranoia against some runaway code, and also because
3464 (for a success return) lines in the spool file are read into big_buffer. */
3465
3466 if (local_scan_data != NULL)
3467 {
3468 int len = Ustrlen(local_scan_data);
3469 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3470 local_scan_data = string_copyn(local_scan_data, len);
3471 }
3472
3473 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3474 {
3475 if (!deliver_freeze) /* ACL might have already frozen */
3476 {
3477 deliver_freeze = TRUE;
3478 deliver_frozen_at = time(NULL);
3479 frozen_by = US"local_scan()";
3480 }
3481 rc = LOCAL_SCAN_ACCEPT;
3482 }
3483 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3484 {
3485 if (!queue_only_policy) /* ACL might have already queued */
3486 {
3487 queue_only_policy = TRUE;
3488 queued_by = US"local_scan()";
3489 }
3490 rc = LOCAL_SCAN_ACCEPT;