Logging: visibility of fakereject
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
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 #ifdef EXPERIMENTAL_DMARC
17 # include "dmarc.h"
18 #endif /* EXPERIMENTAL_DMARC */
19
20 /*************************************************
21 * Local static variables *
22 *************************************************/
23
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
27
28
29
30 /*************************************************
31 * Non-SMTP character reading functions *
32 *************************************************/
33
34 /* These are the default functions that are set up in the variables such as
35 receive_getc initially. They just call the standard functions, passing stdin as
36 the file. (When SMTP input is occurring, different functions are used by
37 changing the pointer variables.) */
38
39 int
40 stdin_getc(void)
41 {
42 return getc(stdin);
43 }
44
45 int
46 stdin_ungetc(int c)
47 {
48 return ungetc(c, stdin);
49 }
50
51 int
52 stdin_feof(void)
53 {
54 return feof(stdin);
55 }
56
57 int
58 stdin_ferror(void)
59 {
60 return ferror(stdin);
61 }
62
63
64
65
66 /*************************************************
67 * Check that a set sender is allowed *
68 *************************************************/
69
70 /* This function is called when a local caller sets an explicit sender address.
71 It checks whether this is permitted, which it is for trusted callers.
72 Otherwise, it must match the pattern(s) in untrusted_set_sender.
73
74 Arguments: the proposed sender address
75 Returns: TRUE for a trusted caller
76 TRUE if the address has been set, untrusted_set_sender has been
77 set, and the address matches something in the list
78 FALSE otherwise
79 */
80
81 BOOL
82 receive_check_set_sender(uschar *newsender)
83 {
84 uschar *qnewsender;
85 if (trusted_caller) return TRUE;
86 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
87 qnewsender = (Ustrchr(newsender, '@') != NULL)?
88 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
89 return
90 match_address_list(qnewsender, TRUE, TRUE, CUSS &untrusted_set_sender, NULL, -1,
91 0, NULL) == OK;
92 }
93
94
95
96
97 /*************************************************
98 * Read space info for a partition *
99 *************************************************/
100
101 /* This function is called by receive_check_fs() below, and also by string
102 expansion for variables such as $spool_space. The field names for the statvfs
103 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
104 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
105 have inodes, and they return -1 for the number available.
106
107 Later: It turns out that some file systems that do not have the concept of
108 inodes return 0 rather than -1. Such systems should also return 0 for the total
109 number of inodes, so we require that to be greater than zero before returning
110 an inode count.
111
112 Arguments:
113 isspool TRUE for spool partition, FALSE for log partition
114 inodeptr address of int to receive inode count; -1 if there isn't one
115
116 Returns: available on-root space, in kilobytes
117 -1 for log partition if there isn't one
118
119 All values are -1 if the STATFS functions are not available.
120 */
121
122 int
123 receive_statvfs(BOOL isspool, int *inodeptr)
124 {
125 #ifdef HAVE_STATFS
126 struct STATVFS statbuf;
127 uschar *path;
128 uschar *name;
129 uschar buffer[1024];
130
131 /* The spool directory must always exist. */
132
133 if (isspool)
134 {
135 path = spool_directory;
136 name = US"spool";
137 }
138
139 /* Need to cut down the log file path to the directory, and to ignore any
140 appearance of "syslog" in it. */
141
142 else
143 {
144 int sep = ':'; /* Not variable - outside scripts use */
145 const uschar *p = log_file_path;
146 name = US"log";
147
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
150
151 if (*p == 0) p = US":";
152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
153 if (Ustrcmp(path, "syslog") != 0)
154 break;
155
156 if (path == NULL) /* No log files */
157 {
158 *inodeptr = -1;
159 return -1;
160 }
161
162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
164 subdirectory has been symbolically linked elsewhere. */
165
166 if (path[0] == 0)
167 {
168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
169 path = buffer;
170 }
171 else
172 {
173 uschar *cp;
174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
175 }
176 }
177
178 /* We now have the path; do the business */
179
180 memset(&statbuf, 0, sizeof(statbuf));
181
182 if (STATVFS(CS path, &statbuf) != 0)
183 {
184 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
185 "%s directory %s: %s", name, spool_directory, strerror(errno));
186 smtp_closedown(US"spool or log directory problem");
187 exim_exit(EXIT_FAILURE);
188 }
189
190 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
191
192 /* Disks are getting huge. Take care with computing the size in kilobytes. */
193
194 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
195
196 /* Unable to find partition sizes in this environment. */
197
198 #else
199 *inodeptr = -1;
200 return -1;
201 #endif
202 }
203
204
205
206
207 /*************************************************
208 * Check space on spool and log partitions *
209 *************************************************/
210
211 /* This function is called before accepting a message; if any thresholds are
212 set, it checks them. If a message_size is supplied, it checks that there is
213 enough space for that size plus the threshold - i.e. that the message won't
214 reduce the space to the threshold. Not all OS have statvfs(); for those that
215 don't, this function always returns TRUE. For some OS the old function and
216 struct name statfs is used; that is handled by a macro, defined in exim.h.
217
218 Arguments:
219 msg_size the (estimated) size of an incoming message
220
221 Returns: FALSE if there isn't enough space, or if the information cannot
222 be obtained
223 TRUE if no check was done or there is enough space
224 */
225
226 BOOL
227 receive_check_fs(int msg_size)
228 {
229 int space, inodes;
230
231 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
232 {
233 space = receive_statvfs(TRUE, &inodes);
234
235 DEBUG(D_receive)
236 debug_printf("spool directory space = %dK inodes = %d "
237 "check_space = %dK inodes = %d msg_size = %d\n",
238 space, inodes, check_spool_space, check_spool_inodes, msg_size);
239
240 if ((space >= 0 && space < check_spool_space) ||
241 (inodes >= 0 && inodes < check_spool_inodes))
242 {
243 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
244 "inodes=%d", space, inodes);
245 return FALSE;
246 }
247 }
248
249 if (check_log_space > 0 || check_log_inodes > 0)
250 {
251 space = receive_statvfs(FALSE, &inodes);
252
253 DEBUG(D_receive)
254 debug_printf("log directory space = %dK inodes = %d "
255 "check_space = %dK inodes = %d\n",
256 space, inodes, check_log_space, check_log_inodes);
257
258 if ((space >= 0 && space < check_log_space) ||
259 (inodes >= 0 && inodes < check_log_inodes))
260 {
261 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
262 "inodes=%d", space, inodes);
263 return FALSE;
264 }
265 }
266
267 return TRUE;
268 }
269
270
271
272 /*************************************************
273 * Bomb out while reading a message *
274 *************************************************/
275
276 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
277 received, or if there is a timeout. A rarer case might be if the log files are
278 screwed up and Exim can't open them to record a message's arrival. Handling
279 that case is done by setting a flag to cause the log functions to call this
280 function if there is an ultimate disaster. That is why it is globally
281 accessible.
282
283 Arguments:
284 reason text reason to pass to the not-quit ACL
285 msg default SMTP response to give if in an SMTP session
286 Returns: it doesn't
287 */
288
289 void
290 receive_bomb_out(uschar *reason, uschar *msg)
291 {
292 static BOOL already_bombing_out;
293 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
294 timeouts, if someone has something slow in their quit ACL. Since the only
295 things we should be doing are to close down cleanly ASAP, on the second
296 pass we also close down stuff that might be opened again, before bypassing
297 the ACL call and exiting. */
298
299 /* If spool_name is set, it contains the name of the data file that is being
300 written. Unlink it before closing so that it cannot be picked up by a delivery
301 process. Ensure that any header file is also removed. */
302
303 if (spool_name[0] != '\0')
304 {
305 Uunlink(spool_name);
306 spool_name[Ustrlen(spool_name) - 1] = 'H';
307 Uunlink(spool_name);
308 spool_name[0] = '\0';
309 }
310
311 /* Now close the file if it is open, either as a fd or a stream. */
312
313 if (data_file != NULL)
314 {
315 (void)fclose(data_file);
316 data_file = NULL;
317 } else if (data_fd >= 0) {
318 (void)close(data_fd);
319 data_fd = -1;
320 }
321
322 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
323 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
324 SMTP response. */
325
326 if (!already_bombing_out)
327 {
328 already_bombing_out = TRUE;
329 if (smtp_input)
330 {
331 if (smtp_batched_input)
332 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
333 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
334 smtp_active_hostname, msg);
335 }
336 }
337
338 /* Exit from the program (non-BSMTP cases) */
339
340 exim_exit(EXIT_FAILURE);
341 }
342
343
344 /*************************************************
345 * Data read timeout *
346 *************************************************/
347
348 /* Handler function for timeouts that occur while reading the data that
349 comprises a message.
350
351 Argument: the signal number
352 Returns: nothing
353 */
354
355 static void
356 data_timeout_handler(int sig)
357 {
358 uschar *msg = NULL;
359
360 sig = sig; /* Keep picky compilers happy */
361
362 if (smtp_input)
363 {
364 msg = US"SMTP incoming data timeout";
365 log_write(L_lost_incoming_connection,
366 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
367 "from %s F=<%s>",
368 (sender_fullhost != NULL)? sender_fullhost : US"local process",
369 sender_address);
370 }
371 else
372 {
373 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
374 log_write(L_lost_incoming_connection,
375 LOG_MAIN, "timed out while reading local message");
376 }
377
378 receive_bomb_out(US"data-timeout", msg); /* Does not return */
379 }
380
381
382
383 /*************************************************
384 * local_scan() timeout *
385 *************************************************/
386
387 /* Handler function for timeouts that occur while running a local_scan()
388 function.
389
390 Argument: the signal number
391 Returns: nothing
392 */
393
394 static void
395 local_scan_timeout_handler(int sig)
396 {
397 sig = sig; /* Keep picky compilers happy */
398 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
399 "message temporarily rejected (size %d)", message_size);
400 /* Does not return */
401 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
402 }
403
404
405
406 /*************************************************
407 * local_scan() crashed *
408 *************************************************/
409
410 /* Handler function for signals that occur while running a local_scan()
411 function.
412
413 Argument: the signal number
414 Returns: nothing
415 */
416
417 static void
418 local_scan_crash_handler(int sig)
419 {
420 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
421 "signal %d - message temporarily rejected (size %d)", sig, message_size);
422 /* Does not return */
423 receive_bomb_out(US"local-scan-error", US"local verification problem");
424 }
425
426
427 /*************************************************
428 * SIGTERM or SIGINT received *
429 *************************************************/
430
431 /* Handler for SIGTERM or SIGINT signals that occur while reading the
432 data that comprises a message.
433
434 Argument: the signal number
435 Returns: nothing
436 */
437
438 static void
439 data_sigterm_sigint_handler(int sig)
440 {
441 uschar *msg = NULL;
442
443 if (smtp_input)
444 {
445 msg = US"Service not available - SIGTERM or SIGINT received";
446 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
447 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
448 }
449 else
450 {
451 if (filter_test == FTEST_NONE)
452 {
453 fprintf(stderr, "\nexim: %s received - message abandoned\n",
454 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
455 log_write(0, LOG_MAIN, "%s received while reading local message",
456 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
457 }
458 }
459
460 receive_bomb_out(US"signal-exit", msg); /* Does not return */
461 }
462
463
464
465 /*************************************************
466 * Add new recipient to list *
467 *************************************************/
468
469 /* This function builds a list of recipient addresses in argc/argv
470 format.
471
472 Arguments:
473 recipient the next address to add to recipients_list
474 pno parent number for fixed aliases; -1 otherwise
475
476 Returns: nothing
477 */
478
479 void
480 receive_add_recipient(uschar *recipient, int pno)
481 {
482 if (recipients_count >= recipients_list_max)
483 {
484 recipient_item *oldlist = recipients_list;
485 int oldmax = recipients_list_max;
486 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
487 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
488 if (oldlist != NULL)
489 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
490 }
491
492 recipients_list[recipients_count].address = recipient;
493 recipients_list[recipients_count].pno = pno;
494 #ifdef EXPERIMENTAL_BRIGHTMAIL
495 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
496 /* reset optin string pointer for next recipient */
497 bmi_current_optin = NULL;
498 #endif
499 recipients_list[recipients_count].orcpt = NULL;
500 recipients_list[recipients_count].dsn_flags = 0;
501 recipients_list[recipients_count++].errors_to = NULL;
502 }
503
504
505
506
507 /*************************************************
508 * Send user response message *
509 *************************************************/
510
511 /* This function is passed a default response code and a user message. It calls
512 smtp_message_code() to check and possibly modify the response code, and then
513 calls smtp_respond() to transmit the response. I put this into a function
514 just to avoid a lot of repetition.
515
516 Arguments:
517 code the response code
518 user_msg the user message
519
520 Returns: nothing
521 */
522
523 #ifndef DISABLE_PRDR
524 static void
525 smtp_user_msg(uschar *code, uschar *user_msg)
526 {
527 int len = 3;
528 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
529 smtp_respond(code, len, TRUE, user_msg);
530 }
531 #endif
532
533
534
535
536
537 /*************************************************
538 * Remove a recipient from the list *
539 *************************************************/
540
541 /* This function is provided for local_scan() to use.
542
543 Argument:
544 recipient address to remove
545
546 Returns: TRUE if it did remove something; FALSE otherwise
547 */
548
549 BOOL
550 receive_remove_recipient(uschar *recipient)
551 {
552 int count;
553 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
554 recipient);
555 for (count = 0; count < recipients_count; count++)
556 {
557 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
558 {
559 if ((--recipients_count - count) > 0)
560 memmove(recipients_list + count, recipients_list + count + 1,
561 (recipients_count - count)*sizeof(recipient_item));
562 return TRUE;
563 }
564 }
565 return FALSE;
566 }
567
568
569
570
571
572 /*************************************************
573 * Read data portion of a non-SMTP message *
574 *************************************************/
575
576 /* This function is called to read the remainder of a message (following the
577 header) when the input is not from SMTP - we are receiving a local message on
578 a standard input stream. The message is always terminated by EOF, and is also
579 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
580 two cases for maximum efficiency.
581
582 Ensure that the body ends with a newline. This will naturally be the case when
583 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
584 as "sequences of lines" - this of course strictly applies only to SMTP, but
585 deliveries into BSD-type mailbox files also require it. Exim used to have a
586 flag for doing this at delivery time, but as it was always set for all
587 transports, I decided to simplify things by putting the check here instead.
588
589 There is at least one MUA (dtmail) that sends CRLF via this interface, and
590 other programs are known to do this as well. Exim used to have a option for
591 dealing with this: in July 2003, after much discussion, the code has been
592 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
593
594 However, for the case when a dot on a line by itself terminates a message, the
595 only recognized terminating sequences before and after the dot are LF and CRLF.
596 Otherwise, having read EOL . CR, you don't know whether to read another
597 character or not.
598
599 Internally, in messages stored in Exim's spool files, LF is used as the line
600 terminator. Under the new regime, bare CRs will no longer appear in these
601 files.
602
603 Arguments:
604 fout a FILE to which to write the message
605
606 Returns: One of the END_xxx values indicating why it stopped reading
607 */
608
609 static int
610 read_message_data(FILE *fout)
611 {
612 int ch_state;
613 register int ch;
614 register int linelength = 0;
615
616 /* Handle the case when only EOF terminates the message */
617
618 if (!dot_ends)
619 {
620 register int last_ch = '\n';
621
622 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
623 {
624 if (ch == 0) body_zerocount++;
625 if (last_ch == '\r' && ch != '\n')
626 {
627 if (linelength > max_received_linelength)
628 max_received_linelength = linelength;
629 linelength = 0;
630 if (fputc('\n', fout) == EOF) return END_WERROR;
631 message_size++;
632 body_linecount++;
633 }
634 if (ch == '\r') continue;
635
636 if (fputc(ch, fout) == EOF) return END_WERROR;
637 if (ch == '\n')
638 {
639 if (linelength > max_received_linelength)
640 max_received_linelength = linelength;
641 linelength = 0;
642 body_linecount++;
643 }
644 else linelength++;
645 if (++message_size > thismessage_size_limit) return END_SIZE;
646 }
647
648 if (last_ch != '\n')
649 {
650 if (linelength > max_received_linelength)
651 max_received_linelength = linelength;
652 if (fputc('\n', fout) == EOF) return END_WERROR;
653 message_size++;
654 body_linecount++;
655 }
656
657 return END_EOF;
658 }
659
660 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
661
662 ch_state = 1;
663
664 while ((ch = (receive_getc)()) != EOF)
665 {
666 if (ch == 0) body_zerocount++;
667 switch (ch_state)
668 {
669 case 0: /* Normal state (previous char written) */
670 if (ch == '\n')
671 {
672 body_linecount++;
673 if (linelength > max_received_linelength)
674 max_received_linelength = linelength;
675 linelength = -1;
676 ch_state = 1;
677 }
678 else if (ch == '\r')
679 { ch_state = 2; continue; }
680 break;
681
682 case 1: /* After written "\n" */
683 if (ch == '.') { ch_state = 3; continue; }
684 if (ch == '\r') { ch_state = 2; continue; }
685 if (ch != '\n') ch_state = 0; else linelength = -1;
686 break;
687
688 case 2:
689 body_linecount++; /* After unwritten "\r" */
690 if (linelength > max_received_linelength)
691 max_received_linelength = linelength;
692 if (ch == '\n')
693 {
694 ch_state = 1;
695 linelength = -1;
696 }
697 else
698 {
699 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
700 if (ch == '\r') continue;
701 ch_state = 0;
702 linelength = 0;
703 }
704 break;
705
706 case 3: /* After "\n." (\n written, dot not) */
707 if (ch == '\n') return END_DOT;
708 if (ch == '\r') { ch_state = 4; continue; }
709 message_size++;
710 linelength++;
711 if (fputc('.', fout) == EOF) return END_WERROR;
712 ch_state = 0;
713 break;
714
715 case 4: /* After "\n.\r" (\n written, rest not) */
716 if (ch == '\n') return END_DOT;
717 message_size += 2;
718 body_linecount++;
719 if (fputs(".\n", fout) == EOF) return END_WERROR;
720 if (ch == '\r') { ch_state = 2; continue; }
721 ch_state = 0;
722 break;
723 }
724
725 linelength++;
726 if (fputc(ch, fout) == EOF) return END_WERROR;
727 if (++message_size > thismessage_size_limit) return END_SIZE;
728 }
729
730 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
731 the message ends with a newline, and we must also write any characters that
732 were saved up while testing for an ending dot. */
733
734 if (ch_state != 1)
735 {
736 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
737 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
738 message_size += Ustrlen(ends[ch_state]);
739 body_linecount++;
740 }
741
742 return END_EOF;
743 }
744
745
746
747
748 /*************************************************
749 * Read data portion of an SMTP message *
750 *************************************************/
751
752 /* This function is called to read the remainder of an SMTP message (after the
753 headers), or to skip over it when an error has occurred. In this case, the
754 output file is passed as NULL.
755
756 If any line begins with a dot, that character is skipped. The input should only
757 be successfully terminated by CR LF . CR LF unless it is local (non-network)
758 SMTP, in which case the CRs are optional, but...
759
760 FUDGE: It seems that sites on the net send out messages with just LF
761 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
762 we make the CRs optional in all cases.
763
764 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
765 well, so that there are no CRs in spooled messages. However, the message
766 terminating dot is not recognized between two bare CRs.
767
768 Arguments:
769 fout a FILE to which to write the message; NULL if skipping
770
771 Returns: One of the END_xxx values indicating why it stopped reading
772 */
773
774 static int
775 read_message_data_smtp(FILE *fout)
776 {
777 int ch_state = 0;
778 int ch;
779 register int linelength = 0;
780
781 while ((ch = (receive_getc)()) != EOF)
782 {
783 if (ch == 0) body_zerocount++;
784 switch (ch_state)
785 {
786 case 0: /* After LF or CRLF */
787 if (ch == '.')
788 {
789 ch_state = 3;
790 continue; /* Don't ever write . after LF */
791 }
792 ch_state = 1;
793
794 /* Else fall through to handle as normal uschar. */
795
796 case 1: /* Normal state */
797 if (ch == '\n')
798 {
799 ch_state = 0;
800 body_linecount++;
801 if (linelength > max_received_linelength)
802 max_received_linelength = linelength;
803 linelength = -1;
804 }
805 else if (ch == '\r')
806 {
807 ch_state = 2;
808 continue;
809 }
810 break;
811
812 case 2: /* After (unwritten) CR */
813 body_linecount++;
814 if (linelength > max_received_linelength)
815 max_received_linelength = linelength;
816 linelength = -1;
817 if (ch == '\n')
818 {
819 ch_state = 0;
820 }
821 else
822 {
823 message_size++;
824 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
825 (void) cutthrough_put_nl();
826 if (ch != '\r') ch_state = 1; else continue;
827 }
828 break;
829
830 case 3: /* After [CR] LF . */
831 if (ch == '\n')
832 return END_DOT;
833 if (ch == '\r')
834 {
835 ch_state = 4;
836 continue;
837 }
838 /* The dot was removed at state 3. For a doubled dot, here, reinstate
839 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
840 and to file below. */
841 if (ch == '.')
842 {
843 uschar c= ch;
844 (void) cutthrough_puts(&c, 1);
845 }
846 ch_state = 1;
847 break;
848
849 case 4: /* After [CR] LF . CR */
850 if (ch == '\n') return END_DOT;
851 message_size++;
852 body_linecount++;
853 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
854 (void) cutthrough_put_nl();
855 if (ch == '\r')
856 {
857 ch_state = 2;
858 continue;
859 }
860 ch_state = 1;
861 break;
862 }
863
864 /* Add the character to the spool file, unless skipping; then loop for the
865 next. */
866
867 message_size++;
868 linelength++;
869 if (fout != NULL)
870 {
871 if (fputc(ch, fout) == EOF) return END_WERROR;
872 if (message_size > thismessage_size_limit) return END_SIZE;
873 }
874 if(ch == '\n')
875 (void) cutthrough_put_nl();
876 else
877 {
878 uschar c= ch;
879 (void) cutthrough_puts(&c, 1);
880 }
881 }
882
883 /* Fall through here if EOF encountered. This indicates some kind of error,
884 since a correct message is terminated by [CR] LF . [CR] LF. */
885
886 return END_EOF;
887 }
888
889
890
891
892 /*************************************************
893 * Swallow SMTP message *
894 *************************************************/
895
896 /* This function is called when there has been some kind of error while reading
897 an SMTP message, and the remaining data may need to be swallowed. It is global
898 because it is called from smtp_closedown() to shut down an incoming call
899 tidily.
900
901 Argument: a FILE from which to read the message
902 Returns: nothing
903 */
904
905 void
906 receive_swallow_smtp(void)
907 {
908 if (message_ended >= END_NOTENDED)
909 message_ended = read_message_data_smtp(NULL);
910 }
911
912
913
914 /*************************************************
915 * Handle lost SMTP connection *
916 *************************************************/
917
918 /* This function logs connection loss incidents and generates an appropriate
919 SMTP response.
920
921 Argument: additional data for the message
922 Returns: the SMTP response
923 */
924
925 static uschar *
926 handle_lost_connection(uschar *s)
927 {
928 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
929 "%s lost while reading message data%s", smtp_get_connection_info(), s);
930 return US"421 Lost incoming connection";
931 }
932
933
934
935
936 /*************************************************
937 * Handle a non-smtp reception error *
938 *************************************************/
939
940 /* This function is called for various errors during the reception of non-SMTP
941 messages. It either sends a message to the sender of the problem message, or it
942 writes to the standard error stream.
943
944 Arguments:
945 errcode code for moan_to_sender(), identifying the error
946 text1 first message text, passed to moan_to_sender()
947 text2 second message text, used only for stderrr
948 error_rc code to pass to exim_exit if no problem
949 f FILE containing body of message (may be stdin)
950 hptr pointer to instore headers or NULL
951
952 Returns: calls exim_exit(), which does not return
953 */
954
955 static void
956 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
957 FILE *f, header_line *hptr)
958 {
959 if (error_handling == ERRORS_SENDER)
960 {
961 error_block eblock;
962 eblock.next = NULL;
963 eblock.text1 = text1;
964 eblock.text2 = US"";
965 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
966 error_rc = EXIT_FAILURE;
967 }
968 else
969 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
970 (void)fclose(f);
971 exim_exit(error_rc);
972 }
973
974
975
976 /*************************************************
977 * Add header lines set up by ACL *
978 *************************************************/
979
980 /* This function is called to add the header lines that were set up by
981 statements in an ACL to the list of headers in memory. It is done in two stages
982 like this, because when the ACL for RCPT is running, the other headers have not
983 yet been received. This function is called twice; once just before running the
984 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
985 are visible to the DATA ACL.
986
987 Originally these header lines were added at the end. Now there is support for
988 three different places: top, bottom, and after the Received: header(s). There
989 will always be at least one Received: header, even if it is marked deleted, and
990 even if something else has been put in front of it.
991
992 Arguments:
993 acl_name text to identify which ACL
994
995 Returns: nothing
996 */
997
998 static void
999 add_acl_headers(int where, uschar *acl_name)
1000 {
1001 header_line *h, *next;
1002 header_line *last_received = NULL;
1003
1004 switch(where)
1005 {
1006 case ACL_WHERE_DKIM:
1007 case ACL_WHERE_MIME:
1008 case ACL_WHERE_DATA:
1009 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1010 {
1011 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1012 " will not take effect on cutthrough deliveries");
1013 return;
1014 }
1015 }
1016
1017 if (acl_removed_headers != NULL)
1018 {
1019 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1020
1021 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1022 {
1023 const uschar * list = acl_removed_headers;
1024 int sep = ':'; /* This is specified as a colon-separated list */
1025 uschar *s;
1026 uschar buffer[128];
1027
1028 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1029 if (header_testname(h, s, Ustrlen(s), FALSE))
1030 {
1031 h->type = htype_old;
1032 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1033 }
1034 }
1035 acl_removed_headers = NULL;
1036 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1037 }
1038
1039 if (acl_added_headers == NULL) return;
1040 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1041
1042 for (h = acl_added_headers; h != NULL; h = next)
1043 {
1044 next = h->next;
1045
1046 switch(h->type)
1047 {
1048 case htype_add_top:
1049 h->next = header_list;
1050 header_list = h;
1051 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1052 break;
1053
1054 case htype_add_rec:
1055 if (last_received == NULL)
1056 {
1057 last_received = header_list;
1058 while (!header_testname(last_received, US"Received", 8, FALSE))
1059 last_received = last_received->next;
1060 while (last_received->next != NULL &&
1061 header_testname(last_received->next, US"Received", 8, FALSE))
1062 last_received = last_received->next;
1063 }
1064 h->next = last_received->next;
1065 last_received->next = h;
1066 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1067 break;
1068
1069 case htype_add_rfc:
1070 /* add header before any header which is NOT Received: or Resent- */
1071 last_received = header_list;
1072 while ( (last_received->next != NULL) &&
1073 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1074 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1075 last_received = last_received->next;
1076 /* last_received now points to the last Received: or Resent-* header
1077 in an uninterrupted chain of those header types (seen from the beginning
1078 of all headers. Our current header must follow it. */
1079 h->next = last_received->next;
1080 last_received->next = h;
1081 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1082 break;
1083
1084 default:
1085 h->next = NULL;
1086 header_last->next = h;
1087 break;
1088 }
1089
1090 if (h->next == NULL) header_last = h;
1091
1092 /* Check for one of the known header types (From:, To:, etc.) though in
1093 practice most added headers are going to be "other". Lower case
1094 identification letters are never stored with the header; they are used
1095 for existence tests when messages are received. So discard any lower case
1096 flag values. */
1097
1098 h->type = header_checkname(h, FALSE);
1099 if (h->type >= 'a') h->type = htype_other;
1100
1101 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1102 }
1103
1104 acl_added_headers = NULL;
1105 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1106 }
1107
1108
1109
1110 /*************************************************
1111 * Add host information for log line *
1112 *************************************************/
1113
1114 /* Called for acceptance and rejecting log lines. This adds information about
1115 the calling host to a string that is being built dynamically.
1116
1117 Arguments:
1118 s the dynamic string
1119 sizeptr points to the size variable
1120 ptrptr points to the pointer variable
1121
1122 Returns: the extended string
1123 */
1124
1125 static uschar *
1126 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1127 {
1128 if (sender_fullhost)
1129 {
1130 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1131 s = string_cat(s, sizeptr, ptrptr, US" DS");
1132 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1133 if (LOGGING(incoming_interface) && interface_address != NULL)
1134 {
1135 s = string_cat(s, sizeptr, ptrptr,
1136 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1137 }
1138 }
1139 if (sender_ident != NULL)
1140 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1141 if (received_protocol != NULL)
1142 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1143 return s;
1144 }
1145
1146
1147
1148 #ifdef WITH_CONTENT_SCAN
1149
1150 /*************************************************
1151 * Run the MIME ACL on a message *
1152 *************************************************/
1153
1154 /* This code is in a subroutine so that it can be used for both SMTP
1155 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1156
1157 Arguments:
1158 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1159 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1160 smtp_reply_ptr Where SMTP reply is being built
1161 blackholed_by_ptr Where "blackholed by" message is being built
1162
1163 Returns: TRUE to carry on; FALSE to abandon the message
1164 */
1165
1166 static BOOL
1167 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1168 uschar **blackholed_by_ptr)
1169 {
1170 FILE *mbox_file;
1171 uschar rfc822_file_path[2048];
1172 unsigned long mbox_size;
1173 header_line *my_headerlist;
1174 uschar *user_msg, *log_msg;
1175 int mime_part_count_buffer = -1;
1176 int rc = OK;
1177
1178 memset(CS rfc822_file_path,0,2048);
1179
1180 /* check if it is a MIME message */
1181 my_headerlist = header_list;
1182 while (my_headerlist != NULL)
1183 {
1184 /* skip deleted headers */
1185 if (my_headerlist->type == '*')
1186 {
1187 my_headerlist = my_headerlist->next;
1188 continue;
1189 }
1190 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1191 {
1192 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1193 goto DO_MIME_ACL;
1194 }
1195 my_headerlist = my_headerlist->next;
1196 }
1197
1198 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1199 return TRUE;
1200
1201 DO_MIME_ACL:
1202 /* make sure the eml mbox file is spooled up */
1203 mbox_file = spool_mbox(&mbox_size, NULL);
1204 if (mbox_file == NULL) {
1205 /* error while spooling */
1206 log_write(0, LOG_MAIN|LOG_PANIC,
1207 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1208 Uunlink(spool_name);
1209 unspool_mbox();
1210 #ifdef EXPERIMENTAL_DCC
1211 dcc_ok = 0;
1212 #endif
1213 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1214 message_id[0] = 0; /* Indicate no message accepted */
1215 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1216 return FALSE; /* Indicate skip to end of receive function */
1217 };
1218
1219 mime_is_rfc822 = 0;
1220
1221 MIME_ACL_CHECK:
1222 mime_part_count = -1;
1223 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1224 (void)fclose(mbox_file);
1225
1226 if (Ustrlen(rfc822_file_path) > 0)
1227 {
1228 mime_part_count = mime_part_count_buffer;
1229
1230 if (unlink(CS rfc822_file_path) == -1)
1231 {
1232 log_write(0, LOG_PANIC,
1233 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1234 goto END_MIME_ACL;
1235 }
1236 }
1237
1238 /* check if we must check any message/rfc822 attachments */
1239 if (rc == OK)
1240 {
1241 uschar temp_path[1024];
1242 struct dirent * entry;
1243 DIR * tempdir;
1244
1245 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1246 spool_directory, message_id);
1247
1248 tempdir = opendir(CS temp_path);
1249 for (;;)
1250 {
1251 if (!(entry = readdir(tempdir)))
1252 break;
1253 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1254 {
1255 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1256 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1257 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1258 rfc822_file_path);
1259 break;
1260 }
1261 }
1262 closedir(tempdir);
1263
1264 if (entry)
1265 {
1266 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1267 {
1268 /* set RFC822 expansion variable */
1269 mime_is_rfc822 = 1;
1270 mime_part_count_buffer = mime_part_count;
1271 goto MIME_ACL_CHECK;
1272 }
1273 log_write(0, LOG_PANIC,
1274 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1275 unlink(CS rfc822_file_path);
1276 }
1277 }
1278
1279 END_MIME_ACL:
1280 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1281 if (rc == DISCARD)
1282 {
1283 recipients_count = 0;
1284 *blackholed_by_ptr = US"MIME ACL";
1285 }
1286 else if (rc != OK)
1287 {
1288 Uunlink(spool_name);
1289 unspool_mbox();
1290 #ifdef EXPERIMENTAL_DCC
1291 dcc_ok = 0;
1292 #endif
1293 if ( smtp_input
1294 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1295 {
1296 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1297 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1298 }
1299 message_id[0] = 0; /* Indicate no message accepted */
1300 return FALSE; /* Cause skip to end of receive function */
1301 }
1302
1303 return TRUE;
1304 }
1305
1306 #endif /* WITH_CONTENT_SCAN */
1307
1308
1309
1310 void
1311 received_header_gen(void)
1312 {
1313 uschar *received;
1314 uschar *timestamp;
1315 header_line *received_header= header_list;
1316
1317 timestamp = expand_string(US"${tod_full}");
1318 if (recipients_count == 1) received_for = recipients_list[0].address;
1319 received = expand_string(received_header_text);
1320 received_for = NULL;
1321
1322 if (!received)
1323 {
1324 if(spool_name[0] != 0)
1325 Uunlink(spool_name); /* Lose the data file */
1326 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1327 "(received_header_text) failed: %s", string_printing(received_header_text),
1328 expand_string_message);
1329 }
1330
1331 /* The first element on the header chain is reserved for the Received header,
1332 so all we have to do is fill in the text pointer, and set the type. However, if
1333 the result of the expansion is an empty string, we leave the header marked as
1334 "old" so as to refrain from adding a Received header. */
1335
1336 if (received[0] == 0)
1337 {
1338 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1339 received_header->type = htype_old;
1340 }
1341 else
1342 {
1343 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1344 received_header->type = htype_received;
1345 }
1346
1347 received_header->slen = Ustrlen(received_header->text);
1348
1349 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1350 received_header->type, received_header->text);
1351 }
1352
1353
1354
1355 /*************************************************
1356 * Receive message *
1357 *************************************************/
1358
1359 /* Receive a message on the given input, and put it into a pair of spool files.
1360 Either a non-null list of recipients, or the extract flag will be true, or
1361 both. The flag sender_local is true for locally generated messages. The flag
1362 submission_mode is true if an ACL has obeyed "control = submission". The flag
1363 suppress_local_fixups is true if an ACL has obeyed "control =
1364 suppress_local_fixups" or -G was passed on the command-line.
1365 The flag smtp_input is true if the message is to be
1366 handled using SMTP conventions about termination and lines starting with dots.
1367 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1368
1369 If a message was successfully read, message_id[0] will be non-zero.
1370
1371 The general actions of this function are:
1372
1373 . Read the headers of the message (if any) into a chain of store
1374 blocks.
1375
1376 . If there is a "sender:" header and the message is locally originated,
1377 throw it away, unless the caller is trusted, or unless
1378 active_local_sender_retain is set - which can only happen if
1379 active_local_from_check is false.
1380
1381 . If recipients are to be extracted from the message, build the
1382 recipients list from the headers, removing any that were on the
1383 original recipients list (unless extract_addresses_remove_arguments is
1384 false), and at the same time, remove any bcc header that may be present.
1385
1386 . Get the spool file for the data, sort out its unique name, open
1387 and lock it (but don't give it the name yet).
1388
1389 . Generate a "Message-Id" header if the message doesn't have one, for
1390 locally-originated messages.
1391
1392 . Generate a "Received" header.
1393
1394 . Ensure the recipients list is fully qualified and rewritten if necessary.
1395
1396 . If there are any rewriting rules, apply them to the sender address
1397 and also to the headers.
1398
1399 . If there is no from: header, generate one, for locally-generated messages
1400 and messages in "submission mode" only.
1401
1402 . If the sender is local, check that from: is correct, and if not, generate
1403 a Sender: header, unless message comes from a trusted caller, or this
1404 feature is disabled by active_local_from_check being false.
1405
1406 . If there is no "date" header, generate one, for locally-originated
1407 or submission mode messages only.
1408
1409 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1410 dot_ends mode, to the data file. Leave it open, to hold the lock.
1411
1412 . Write the envelope and the headers to a new file.
1413
1414 . Set the name for the header file; close it.
1415
1416 . Set the name for the data file; close it.
1417
1418 Because this function can potentially be called many times in a single
1419 SMTP connection, all store should be got by store_get(), so that it will be
1420 automatically retrieved after the message is accepted.
1421
1422 FUDGE: It seems that sites on the net send out messages with just LF
1423 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1424 we make the CRs optional in all cases.
1425
1426 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1427 new regime is now in place in which bare CRs in header lines are turned into LF
1428 followed by a space, so as not to terminate the header line.
1429
1430 February 2004: A bare LF in a header line in a message whose first line was
1431 terminated by CRLF is treated in the same way as a bare CR.
1432
1433 Arguments:
1434 extract_recip TRUE if recipients are to be extracted from the message's
1435 headers
1436
1437 Returns: TRUE there are more messages to be read (SMTP input)
1438 FALSE there are no more messages to be read (non-SMTP input
1439 or SMTP connection collapsed, or other failure)
1440
1441 When reading a message for filter testing, the returned value indicates
1442 whether the headers (which is all that is read) were terminated by '.' or
1443 not. */
1444
1445 BOOL
1446 receive_msg(BOOL extract_recip)
1447 {
1448 int i;
1449 int rc = FAIL;
1450 int msg_size = 0;
1451 int process_info_len = Ustrlen(process_info);
1452 int error_rc = (error_handling == ERRORS_SENDER)?
1453 errors_sender_rc : EXIT_FAILURE;
1454 int header_size = 256;
1455 int start, end, domain, size, sptr;
1456 int id_resolution;
1457 int had_zero = 0;
1458 int prevlines_length = 0;
1459
1460 register int ptr = 0;
1461
1462 BOOL contains_resent_headers = FALSE;
1463 BOOL extracted_ignored = FALSE;
1464 BOOL first_line_ended_crlf = TRUE_UNSET;
1465 BOOL smtp_yield = TRUE;
1466 BOOL yield = FALSE;
1467
1468 BOOL resents_exist = FALSE;
1469 uschar *resent_prefix = US"";
1470 uschar *blackholed_by = NULL;
1471 uschar *blackhole_log_msg = US"";
1472 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1473
1474 flock_t lock_data;
1475 error_block *bad_addresses = NULL;
1476
1477 uschar *frozen_by = NULL;
1478 uschar *queued_by = NULL;
1479
1480 uschar *errmsg, *s;
1481 struct stat statbuf;
1482
1483 /* Final message to give to SMTP caller, and messages from ACLs */
1484
1485 uschar *smtp_reply = NULL;
1486 uschar *user_msg, *log_msg;
1487
1488 /* Working header pointers */
1489
1490 header_line *h, *next;
1491
1492 /* Flags for noting the existence of certain headers (only one left) */
1493
1494 BOOL date_header_exists = FALSE;
1495
1496 /* Pointers to receive the addresses of headers whose contents we need. */
1497
1498 header_line *from_header = NULL;
1499 header_line *subject_header = NULL;
1500 header_line *msgid_header = NULL;
1501 header_line *received_header;
1502
1503 #ifdef EXPERIMENTAL_DMARC
1504 int dmarc_up = 0;
1505 #endif /* EXPERIMENTAL_DMARC */
1506
1507 /* Variables for use when building the Received: header. */
1508
1509 uschar *timestamp;
1510 int tslen;
1511
1512 /* Release any open files that might have been cached while preparing to
1513 accept the message - e.g. by verifying addresses - because reading a message
1514 might take a fair bit of real time. */
1515
1516 search_tidyup();
1517
1518 /* Extracting the recipient list from an input file is incompatible with
1519 cutthrough delivery with the no-spool option. It shouldn't be possible
1520 to set up the combination, but just in case kill any ongoing connection. */
1521 if (extract_recip || !smtp_input)
1522 cancel_cutthrough_connection("not smtp input");
1523
1524 /* Initialize the chain of headers by setting up a place-holder for Received:
1525 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1526 pointing to the end of the chain to make adding headers simple. */
1527
1528 received_header = header_list = header_last = store_get(sizeof(header_line));
1529 header_list->next = NULL;
1530 header_list->type = htype_old;
1531 header_list->text = NULL;
1532 header_list->slen = 0;
1533
1534 /* Control block for the next header to be read. */
1535
1536 next = store_get(sizeof(header_line));
1537 next->text = store_get(header_size);
1538
1539 /* Initialize message id to be null (indicating no message read), and the
1540 header names list to be the normal list. Indicate there is no data file open
1541 yet, initialize the size and warning count, and deal with no size limit. */
1542
1543 message_id[0] = 0;
1544 data_file = NULL;
1545 data_fd = -1;
1546 spool_name = US"";
1547 message_size = 0;
1548 warning_count = 0;
1549 received_count = 1; /* For the one we will add */
1550
1551 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1552
1553 /* While reading the message, the following counts are computed. */
1554
1555 message_linecount = body_linecount = body_zerocount =
1556 max_received_linelength = 0;
1557
1558 #ifndef DISABLE_DKIM
1559 /* Call into DKIM to set up the context. */
1560 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1561 #endif
1562
1563 #ifdef EXPERIMENTAL_DMARC
1564 /* initialize libopendmarc */
1565 dmarc_up = dmarc_init();
1566 #endif
1567
1568 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1569 ids, and fractions of a second are required. See the comments that precede the
1570 message id creation below. */
1571
1572 (void)gettimeofday(&message_id_tv, NULL);
1573
1574 /* For other uses of the received time we can operate with granularity of one
1575 second, and for that we use the global variable received_time. This is for
1576 things like ultimate message timeouts. */
1577
1578 received_time = message_id_tv.tv_sec;
1579
1580 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1581 happen in the smtp_getc() function when it refills its buffer. */
1582
1583 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1584
1585 /* If not SMTP input, timeout happens only if configured, and we just set a
1586 single timeout for the whole message. */
1587
1588 else if (receive_timeout > 0)
1589 {
1590 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1591 alarm(receive_timeout);
1592 }
1593
1594 /* SIGTERM and SIGINT are caught always. */
1595
1596 signal(SIGTERM, data_sigterm_sigint_handler);
1597 signal(SIGINT, data_sigterm_sigint_handler);
1598
1599 /* Header lines in messages are not supposed to be very long, though when
1600 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1601 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1602 storing the header, and extend this as necessary using string_cat().
1603
1604 To cope with total lunacies, impose an upper limit on the length of the header
1605 section of the message, as otherwise the store will fill up. We must also cope
1606 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1607 Folded header lines are joined into one string, leaving the '\n' characters
1608 inside them, so that writing them out reproduces the input.
1609
1610 Loop for each character of each header; the next structure for chaining the
1611 header is set up already, with ptr the offset of the next character in
1612 next->text. */
1613
1614 for (;;)
1615 {
1616 int ch = (receive_getc)();
1617
1618 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1619 SMTP must have a correct "." terminator. */
1620
1621 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1622 {
1623 smtp_reply = handle_lost_connection(US" (header)");
1624 smtp_yield = FALSE;
1625 goto TIDYUP; /* Skip to end of function */
1626 }
1627
1628 /* See if we are at the current header's size limit - there must be at least
1629 four bytes left. This allows for the new character plus a zero, plus two for
1630 extra insertions when we are playing games with dots and carriage returns. If
1631 we are at the limit, extend the text buffer. This could have been done
1632 automatically using string_cat() but because this is a tightish loop storing
1633 only one character at a time, we choose to do it inline. Normally
1634 store_extend() will be able to extend the block; only at the end of a big
1635 store block will a copy be needed. To handle the case of very long headers
1636 (and sometimes lunatic messages can have ones that are 100s of K long) we
1637 call store_release() for strings that have been copied - if the string is at
1638 the start of a block (and therefore the only thing in it, because we aren't
1639 doing any other gets), the block gets freed. We can only do this because we
1640 know there are no other calls to store_get() going on. */
1641
1642 if (ptr >= header_size - 4)
1643 {
1644 int oldsize = header_size;
1645 /* header_size += 256; */
1646 header_size *= 2;
1647 if (!store_extend(next->text, oldsize, header_size))
1648 {
1649 uschar *newtext = store_get(header_size);
1650 memcpy(newtext, next->text, ptr);
1651 store_release(next->text);
1652 next->text = newtext;
1653 }
1654 }
1655
1656 /* Cope with receiving a binary zero. There is dispute about whether
1657 these should be allowed in RFC 822 messages. The middle view is that they
1658 should not be allowed in headers, at least. Exim takes this attitude at
1659 the moment. We can't just stomp on them here, because we don't know that
1660 this line is a header yet. Set a flag to cause scanning later. */
1661
1662 if (ch == 0) had_zero++;
1663
1664 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1665 those from data files use just LF. Treat LF in local SMTP input as a
1666 terminator too. Treat EOF as a line terminator always. */
1667
1668 if (ch == EOF) goto EOL;
1669
1670 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1671 other MTAs accept this. We are therefore forced into this "liberalisation"
1672 too, so we accept LF as a line terminator whatever the source of the message.
1673 However, if the first line of the message ended with a CRLF, we treat a bare
1674 LF specially by inserting a white space after it to ensure that the header
1675 line is not terminated. */
1676
1677 if (ch == '\n')
1678 {
1679 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1680 else if (first_line_ended_crlf) receive_ungetc(' ');
1681 goto EOL;
1682 }
1683
1684 /* This is not the end of the line. If this is SMTP input and this is
1685 the first character in the line and it is a "." character, ignore it.
1686 This implements the dot-doubling rule, though header lines starting with
1687 dots aren't exactly common. They are legal in RFC 822, though. If the
1688 following is CRLF or LF, this is the line that that terminates the
1689 entire message. We set message_ended to indicate this has happened (to
1690 prevent further reading), and break out of the loop, having freed the
1691 empty header, and set next = NULL to indicate no data line. */
1692
1693 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1694 {
1695 ch = (receive_getc)();
1696 if (ch == '\r')
1697 {
1698 ch = (receive_getc)();
1699 if (ch != '\n')
1700 {
1701 receive_ungetc(ch);
1702 ch = '\r'; /* Revert to CR */
1703 }
1704 }
1705 if (ch == '\n')
1706 {
1707 message_ended = END_DOT;
1708 store_reset(next);
1709 next = NULL;
1710 break; /* End character-reading loop */
1711 }
1712
1713 /* For non-SMTP input, the dot at the start of the line was really a data
1714 character. What is now in ch is the following character. We guaranteed
1715 enough space for this above. */
1716
1717 if (!smtp_input)
1718 {
1719 next->text[ptr++] = '.';
1720 message_size++;
1721 }
1722 }
1723
1724 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1725 remember this case if this is the first line ending. */
1726
1727 if (ch == '\r')
1728 {
1729 ch = (receive_getc)();
1730 if (ch == '\n')
1731 {
1732 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1733 goto EOL;
1734 }
1735
1736 /* Otherwise, put back the character after CR, and turn the bare CR
1737 into LF SP. */
1738
1739 ch = (receive_ungetc)(ch);
1740 next->text[ptr++] = '\n';
1741 message_size++;
1742 ch = ' ';
1743 }
1744
1745 /* We have a data character for the header line. */
1746
1747 next->text[ptr++] = ch; /* Add to buffer */
1748 message_size++; /* Total message size so far */
1749
1750 /* Handle failure due to a humungously long header section. The >= allows
1751 for the terminating \n. Add what we have so far onto the headers list so
1752 that it gets reflected in any error message, and back up the just-read
1753 character. */
1754
1755 if (message_size >= header_maxsize)
1756 {
1757 next->text[ptr] = 0;
1758 next->slen = ptr;
1759 next->type = htype_other;
1760 next->next = NULL;
1761 header_last->next = next;
1762 header_last = next;
1763
1764 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1765 "%s (more than %d characters): message abandoned",
1766 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1767
1768 if (smtp_input)
1769 {
1770 smtp_reply = US"552 Message header is ridiculously long";
1771 receive_swallow_smtp();
1772 goto TIDYUP; /* Skip to end of function */
1773 }
1774
1775 else
1776 {
1777 give_local_error(ERRMESS_VLONGHEADER,
1778 string_sprintf("message header longer than %d characters received: "
1779 "message not accepted", header_maxsize), US"", error_rc, stdin,
1780 header_list->next);
1781 /* Does not return */
1782 }
1783 }
1784
1785 continue; /* With next input character */
1786
1787 /* End of header line reached */
1788
1789 EOL:
1790
1791 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1792
1793 receive_linecount++;
1794 message_linecount++;
1795
1796 /* Keep track of maximum line length */
1797
1798 if (ptr - prevlines_length > max_received_linelength)
1799 max_received_linelength = ptr - prevlines_length;
1800 prevlines_length = ptr + 1;
1801
1802 /* Now put in the terminating newline. There is always space for
1803 at least two more characters. */
1804
1805 next->text[ptr++] = '\n';
1806 message_size++;
1807
1808 /* A blank line signals the end of the headers; release the unwanted
1809 space and set next to NULL to indicate this. */
1810
1811 if (ptr == 1)
1812 {
1813 store_reset(next);
1814 next = NULL;
1815 break;
1816 }
1817
1818 /* There is data in the line; see if the next input character is a
1819 whitespace character. If it is, we have a continuation of this header line.
1820 There is always space for at least one character at this point. */
1821
1822 if (ch != EOF)
1823 {
1824 int nextch = (receive_getc)();
1825 if (nextch == ' ' || nextch == '\t')
1826 {
1827 next->text[ptr++] = nextch;
1828 message_size++;
1829 continue; /* Iterate the loop */
1830 }
1831 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1832 else ch = EOF; /* Cause main loop to exit at end */
1833 }
1834
1835 /* We have got to the real line end. Terminate the string and release store
1836 beyond it. If it turns out to be a real header, internal binary zeros will
1837 be squashed later. */
1838
1839 next->text[ptr] = 0;
1840 next->slen = ptr;
1841 store_reset(next->text + ptr + 1);
1842
1843 /* Check the running total size against the overall message size limit. We
1844 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1845 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1846 headers - the code to read the body will then also hit the buffer. */
1847
1848 if (message_size > thismessage_size_limit) break;
1849
1850 /* A line that is not syntactically correct for a header also marks
1851 the end of the headers. In this case, we leave next containing the
1852 first data line. This might actually be several lines because of the
1853 continuation logic applied above, but that doesn't matter.
1854
1855 It turns out that smail, and presumably sendmail, accept leading lines
1856 of the form
1857
1858 From ph10 Fri Jan 5 12:35 GMT 1996
1859
1860 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1861 find any documentation of this, but for compatibility it had better be
1862 accepted. Exim restricts it to the case of non-smtp messages, and
1863 treats it as an alternative to the -f command line option. Thus it is
1864 ignored except for trusted users or filter testing. Otherwise it is taken
1865 as the sender address, unless -f was used (sendmail compatibility).
1866
1867 It further turns out that some UUCPs generate the From_line in a different
1868 format, e.g.
1869
1870 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1871
1872 The regex for matching these things is now capable of recognizing both
1873 formats (including 2- and 4-digit years in the latter). In fact, the regex
1874 is now configurable, as is the expansion string to fish out the sender.
1875
1876 Even further on it has been discovered that some broken clients send
1877 these lines in SMTP messages. There is now an option to ignore them from
1878 specified hosts or networks. Sigh. */
1879
1880 if (header_last == header_list &&
1881 (!smtp_input
1882 ||
1883 (sender_host_address != NULL &&
1884 verify_check_host(&ignore_fromline_hosts) == OK)
1885 ||
1886 (sender_host_address == NULL && ignore_fromline_local)
1887 ) &&
1888 regex_match_and_setup(regex_From, next->text, 0, -1))
1889 {
1890 if (!sender_address_forced)
1891 {
1892 uschar *uucp_sender = expand_string(uucp_from_sender);
1893 if (uucp_sender == NULL)
1894 {
1895 log_write(0, LOG_MAIN|LOG_PANIC,
1896 "expansion of \"%s\" failed after matching "
1897 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1898 }
1899 else
1900 {
1901 int start, end, domain;
1902 uschar *errmess;
1903 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1904 &start, &end, &domain, TRUE);
1905 if (newsender != NULL)
1906 {
1907 if (domain == 0 && newsender[0] != 0)
1908 newsender = rewrite_address_qualify(newsender, FALSE);
1909
1910 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1911 {
1912 sender_address = newsender;
1913
1914 if (trusted_caller || filter_test != FTEST_NONE)
1915 {
1916 authenticated_sender = NULL;
1917 originator_name = US"";
1918 sender_local = FALSE;
1919 }
1920
1921 if (filter_test != FTEST_NONE)
1922 printf("Sender taken from \"From \" line\n");
1923 }
1924 }
1925 }
1926 }
1927 }
1928
1929 /* Not a leading "From " line. Check to see if it is a valid header line.
1930 Header names may contain any non-control characters except space and colon,
1931 amazingly. */
1932
1933 else
1934 {
1935 uschar *p = next->text;
1936
1937 /* If not a valid header line, break from the header reading loop, leaving
1938 next != NULL, indicating that it holds the first line of the body. */
1939
1940 if (isspace(*p)) break;
1941 while (mac_isgraph(*p) && *p != ':') p++;
1942 while (isspace(*p)) p++;
1943 if (*p != ':')
1944 {
1945 body_zerocount = had_zero;
1946 break;
1947 }
1948
1949 /* We have a valid header line. If there were any binary zeroes in
1950 the line, stomp on them here. */
1951
1952 if (had_zero > 0)
1953 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1954
1955 /* It is perfectly legal to have an empty continuation line
1956 at the end of a header, but it is confusing to humans
1957 looking at such messages, since it looks like a blank line.
1958 Reduce confusion by removing redundant white space at the
1959 end. We know that there is at least one printing character
1960 (the ':' tested for above) so there is no danger of running
1961 off the end. */
1962
1963 p = next->text + ptr - 2;
1964 for (;;)
1965 {
1966 while (*p == ' ' || *p == '\t') p--;
1967 if (*p != '\n') break;
1968 ptr = (p--) - next->text + 1;
1969 message_size -= next->slen - ptr;
1970 next->text[ptr] = 0;
1971 next->slen = ptr;
1972 }
1973
1974 /* Add the header to the chain */
1975
1976 next->type = htype_other;
1977 next->next = NULL;
1978 header_last->next = next;
1979 header_last = next;
1980
1981 /* Check the limit for individual line lengths. This comes after adding to
1982 the chain so that the failing line is reflected if a bounce is generated
1983 (for a local message). */
1984
1985 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1986 {
1987 log_write(0, LOG_MAIN, "overlong message header line received from "
1988 "%s (more than %d characters): message abandoned",
1989 sender_host_unknown? sender_ident : sender_fullhost,
1990 header_line_maxsize);
1991
1992 if (smtp_input)
1993 {
1994 smtp_reply = US"552 A message header line is too long";
1995 receive_swallow_smtp();
1996 goto TIDYUP; /* Skip to end of function */
1997 }
1998
1999 else
2000 {
2001 give_local_error(ERRMESS_VLONGHDRLINE,
2002 string_sprintf("message header line longer than %d characters "
2003 "received: message not accepted", header_line_maxsize), US"",
2004 error_rc, stdin, header_list->next);
2005 /* Does not return */
2006 }
2007 }
2008
2009 /* Note if any resent- fields exist. */
2010
2011 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2012 {
2013 resents_exist = TRUE;
2014 resent_prefix = US"Resent-";
2015 }
2016 }
2017
2018 /* The line has been handled. If we have hit EOF, break out of the loop,
2019 indicating no pending data line. */
2020
2021 if (ch == EOF) { next = NULL; break; }
2022
2023 /* Set up for the next header */
2024
2025 header_size = 256;
2026 next = store_get(sizeof(header_line));
2027 next->text = store_get(header_size);
2028 ptr = 0;
2029 had_zero = 0;
2030 prevlines_length = 0;
2031 } /* Continue, starting to read the next header */
2032
2033 /* At this point, we have read all the headers into a data structure in main
2034 store. The first header is still the dummy placeholder for the Received: header
2035 we are going to generate a bit later on. If next != NULL, it contains the first
2036 data line - which terminated the headers before reaching a blank line (not the
2037 normal case). */
2038
2039 DEBUG(D_receive)
2040 {
2041 debug_printf(">>Headers received:\n");
2042 for (h = header_list->next; h != NULL; h = h->next)
2043 debug_printf("%s", h->text);
2044 debug_printf("\n");
2045 }
2046
2047 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2048 is dropped immediately after valid headers, the next thing we will see is EOF.
2049 We must test for this specially, as further down the reading of the data is
2050 skipped if already at EOF. */
2051
2052 if (smtp_input && (receive_feof)())
2053 {
2054 smtp_reply = handle_lost_connection(US" (after header)");
2055 smtp_yield = FALSE;
2056 goto TIDYUP; /* Skip to end of function */
2057 }
2058
2059 /* If this is a filter test run and no headers were read, output a warning
2060 in case there is a mistake in the test message. */
2061
2062 if (filter_test != FTEST_NONE && header_list->next == NULL)
2063 printf("Warning: no message headers read\n");
2064
2065
2066 /* Scan the headers to identify them. Some are merely marked for later
2067 processing; some are dealt with here. */
2068
2069 for (h = header_list->next; h != NULL; h = h->next)
2070 {
2071 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2072 if (is_resent) contains_resent_headers = TRUE;
2073
2074 switch (header_checkname(h, is_resent))
2075 {
2076 case htype_bcc:
2077 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2078 break;
2079
2080 case htype_cc:
2081 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2082 break;
2083
2084 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2085
2086 case htype_date:
2087 if (!resents_exist || is_resent) date_header_exists = TRUE;
2088 break;
2089
2090 /* Same comments as about Return-Path: below. */
2091
2092 case htype_delivery_date:
2093 if (delivery_date_remove) h->type = htype_old;
2094 break;
2095
2096 /* Same comments as about Return-Path: below. */
2097
2098 case htype_envelope_to:
2099 if (envelope_to_remove) h->type = htype_old;
2100 break;
2101
2102 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2103 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2104 header consists of just the login id of the user who called Exim, rewrite
2105 it with the gecos field first. Apply this rule to Resent-From: if there
2106 are resent- fields. */
2107
2108 case htype_from:
2109 h->type = htype_from;
2110 if (!resents_exist || is_resent)
2111 {
2112 from_header = h;
2113 if (!smtp_input)
2114 {
2115 int len;
2116 uschar *s = Ustrchr(h->text, ':') + 1;
2117 while (isspace(*s)) s++;
2118 len = h->slen - (s - h->text) - 1;
2119 if (Ustrlen(originator_login) == len &&
2120 strncmpic(s, originator_login, len) == 0)
2121 {
2122 uschar *name = is_resent? US"Resent-From" : US"From";
2123 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2124 originator_login, qualify_domain_sender);
2125 from_header = header_last;
2126 h->type = htype_old;
2127 DEBUG(D_receive|D_rewrite)
2128 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2129 }
2130 }
2131 }
2132 break;
2133
2134 /* Identify the Message-id: header for generating "in-reply-to" in the
2135 autoreply transport. For incoming logging, save any resent- value. In both
2136 cases, take just the first of any multiples. */
2137
2138 case htype_id:
2139 if (msgid_header == NULL && (!resents_exist || is_resent))
2140 {
2141 msgid_header = h;
2142 h->type = htype_id;
2143 }
2144 break;
2145
2146 /* Flag all Received: headers */
2147
2148 case htype_received:
2149 h->type = htype_received;
2150 received_count++;
2151 break;
2152
2153 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2154
2155 case htype_reply_to:
2156 h->type = htype_reply_to;
2157 break;
2158
2159 /* The Return-path: header is supposed to be added to messages when
2160 they leave the SMTP system. We shouldn't receive messages that already
2161 contain Return-path. However, since Exim generates Return-path: on
2162 local delivery, resent messages may well contain it. We therefore
2163 provide an option (which defaults on) to remove any Return-path: headers
2164 on input. Removal actually means flagging as "old", which prevents the
2165 header being transmitted with the message. */
2166
2167 case htype_return_path:
2168 if (return_path_remove) h->type = htype_old;
2169
2170 /* If we are testing a mail filter file, use the value of the
2171 Return-Path: header to set up the return_path variable, which is not
2172 otherwise set. However, remove any <> that surround the address
2173 because the variable doesn't have these. */
2174
2175 if (filter_test != FTEST_NONE)
2176 {
2177 uschar *start = h->text + 12;
2178 uschar *end = start + Ustrlen(start);
2179 while (isspace(*start)) start++;
2180 while (end > start && isspace(end[-1])) end--;
2181 if (*start == '<' && end[-1] == '>')
2182 {
2183 start++;
2184 end--;
2185 }
2186 return_path = string_copyn(start, end - start);
2187 printf("Return-path taken from \"Return-path:\" header line\n");
2188 }
2189 break;
2190
2191 /* If there is a "Sender:" header and the message is locally originated,
2192 and from an untrusted caller and suppress_local_fixups is not set, or if we
2193 are in submission mode for a remote message, mark it "old" so that it will
2194 not be transmitted with the message, unless active_local_sender_retain is
2195 set. (This can only be true if active_local_from_check is false.) If there
2196 are any resent- headers in the message, apply this rule to Resent-Sender:
2197 instead of Sender:. Messages with multiple resent- header sets cannot be
2198 tidily handled. (For this reason, at least one MUA - Pine - turns old
2199 resent- headers into X-resent- headers when resending, leaving just one
2200 set.) */
2201
2202 case htype_sender:
2203 h->type = ((!active_local_sender_retain &&
2204 (
2205 (sender_local && !trusted_caller && !suppress_local_fixups)
2206 || submission_mode
2207 )
2208 ) &&
2209 (!resents_exist||is_resent))?
2210 htype_old : htype_sender;
2211 break;
2212
2213 /* Remember the Subject: header for logging. There is no Resent-Subject */
2214
2215 case htype_subject:
2216 subject_header = h;
2217 break;
2218
2219 /* "To:" gets flagged, and the existence of a recipient header is noted,
2220 whether it's resent- or not. */
2221
2222 case htype_to:
2223 h->type = htype_to;
2224 /****
2225 to_or_cc_header_exists = TRUE;
2226 ****/
2227 break;
2228 }
2229 }
2230
2231 /* Extract recipients from the headers if that is required (the -t option).
2232 Note that this is documented as being done *before* any address rewriting takes
2233 place. There are two possibilities:
2234
2235 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2236 recipients already listed are to be REMOVED from the message. Smail 3 works
2237 like this. We need to build a non-recipients tree for that list, because in
2238 subsequent processing this data is held in a tree and that's what the
2239 spool_write_header() function expects. Make sure that non-recipient addresses
2240 are fully qualified and rewritten if necessary.
2241
2242 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2243 those in the command line arguments (and it is rumoured some other MTAs do
2244 this). Therefore, there is an option to make Exim behave this way.
2245
2246 *** Notes on "Resent-" header lines ***
2247
2248 The presence of resent-headers in the message makes -t horribly ambiguous.
2249 Experiments with sendmail showed that it uses recipients for all resent-
2250 headers, totally ignoring the concept of "sets of resent- headers" as described
2251 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2252 with all the addresses in one instance of each header.
2253
2254 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2255 error for -t if there were resent- headers in the message. However, after a
2256 discussion on the mailing list, I've learned that there are MUAs that use
2257 resent- headers with -t, and also that the stuff about sets of resent- headers
2258 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2259 message with -t and resent- header lines makes sure that only *its* resent-
2260 headers are present; previous ones are often renamed as X-resent- for example.
2261
2262 Consequently, Exim has been changed so that, if any resent- header lines are
2263 present, the recipients are taken from all of the appropriate resent- lines,
2264 and not from the ordinary To:, Cc:, etc. */
2265
2266 if (extract_recip)
2267 {
2268 int rcount = 0;
2269 error_block **bnext = &bad_addresses;
2270
2271 if (extract_addresses_remove_arguments)
2272 {
2273 while (recipients_count-- > 0)
2274 {
2275 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2276 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2277 tree_add_nonrecipient(s);
2278 }
2279 recipients_list = NULL;
2280 recipients_count = recipients_list_max = 0;
2281 }
2282
2283 /* Now scan the headers */
2284
2285 for (h = header_list->next; h != NULL; h = h->next)
2286 {
2287 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2288 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2289 {
2290 uschar *s = Ustrchr(h->text, ':') + 1;
2291 while (isspace(*s)) s++;
2292
2293 parse_allow_group = TRUE; /* Allow address group syntax */
2294
2295 while (*s != 0)
2296 {
2297 uschar *ss = parse_find_address_end(s, FALSE);
2298 uschar *recipient, *errmess, *p, *pp;
2299 int start, end, domain;
2300
2301 /* Check on maximum */
2302
2303 if (recipients_max > 0 && ++rcount > recipients_max)
2304 {
2305 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2306 US"message rejected: ", error_rc, stdin, NULL);
2307 /* Does not return */
2308 }
2309
2310 /* Make a copy of the address, and remove any internal newlines. These
2311 may be present as a result of continuations of the header line. The
2312 white space that follows the newline must not be removed - it is part
2313 of the header. */
2314
2315 pp = recipient = store_get(ss - s + 1);
2316 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2317 *pp = 0;
2318
2319 #ifdef SUPPORT_I18N
2320 {
2321 BOOL b = allow_utf8_domains;
2322 allow_utf8_domains = TRUE;
2323 #endif
2324 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2325 &domain, FALSE);
2326
2327 #ifdef SUPPORT_I18N
2328 if (string_is_utf8(recipient))
2329 message_smtputf8 = TRUE;
2330 else
2331 allow_utf8_domains = b;
2332 }
2333 #endif
2334
2335 /* Keep a list of all the bad addresses so we can send a single
2336 error message at the end. However, an empty address is not an error;
2337 just ignore it. This can come from an empty group list like
2338
2339 To: Recipients of list:;
2340
2341 If there are no recipients at all, an error will occur later. */
2342
2343 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2344 {
2345 int len = Ustrlen(s);
2346 error_block *b = store_get(sizeof(error_block));
2347 while (len > 0 && isspace(s[len-1])) len--;
2348 b->next = NULL;
2349 b->text1 = string_printing(string_copyn(s, len));
2350 b->text2 = errmess;
2351 *bnext = b;
2352 bnext = &(b->next);
2353 }
2354
2355 /* If the recipient is already in the nonrecipients tree, it must
2356 have appeared on the command line with the option extract_addresses_
2357 remove_arguments set. Do not add it to the recipients, and keep a note
2358 that this has happened, in order to give a better error if there are
2359 no recipients left. */
2360
2361 else if (recipient != NULL)
2362 {
2363 if (tree_search(tree_nonrecipients, recipient) == NULL)
2364 receive_add_recipient(recipient, -1);
2365 else
2366 extracted_ignored = TRUE;
2367 }
2368
2369 /* Move on past this address */
2370
2371 s = ss + (*ss? 1:0);
2372 while (isspace(*s)) s++;
2373 } /* Next address */
2374
2375 parse_allow_group = FALSE; /* Reset group syntax flags */
2376 parse_found_group = FALSE;
2377
2378 /* If this was the bcc: header, mark it "old", which means it
2379 will be kept on the spool, but not transmitted as part of the
2380 message. */
2381
2382 if (h->type == htype_bcc) h->type = htype_old;
2383 } /* For appropriate header line */
2384 } /* For each header line */
2385
2386 }
2387
2388 /* Now build the unique message id. This has changed several times over the
2389 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2390 Retaining all the history in the comment has become too unwieldy - read
2391 previous release sources if you want it.
2392
2393 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2394 The first part is the current time, in seconds. The second part is the current
2395 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2396 can hold a number in the range 0-3843. It used to be a computed sequence
2397 number, but is now the fractional component of the current time in units of
2398 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2399 received, Exim ensures that the timer has ticked at the appropriate level
2400 before proceeding, to avoid duplication if the pid happened to be re-used
2401 within the same time period. It seems likely that most messages will take at
2402 least half a millisecond to be received, so no delay will normally be
2403 necessary. At least for some time...
2404
2405 There is a modification when localhost_number is set. Formerly this was allowed
2406 to be as large as 255. Now it is restricted to the range 0-16, and the final
2407 component of the message id becomes (localhost_number * 200) + fractional time
2408 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2409
2410 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2411 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2412 still allows the tttttt field to hold a large enough number to last for some
2413 more decades, and the final two-digit field can hold numbers up to 1295, which
2414 is enough for milliseconds (instead of 1/2000 of a second).
2415
2416 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2417 pid, so it is probably safe because pids have to be positive. The
2418 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2419 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2420
2421 Note that string_base62() returns its data in a static storage block, so it
2422 must be copied before calling string_base62() again. It always returns exactly
2423 6 characters.
2424
2425 There doesn't seem to be anything in the RFC which requires a message id to
2426 start with a letter, but Smail was changed to ensure this. The external form of
2427 the message id (as supplied by string expansion) therefore starts with an
2428 additional leading 'E'. The spool file names do not include this leading
2429 letter and it is not used internally.
2430
2431 NOTE: If ever the format of message ids is changed, the regular expression for
2432 checking that a string is in this format must be updated in a corresponding
2433 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2434 must also be changed to reflect the correct string length. Then, of course,
2435 other programs that rely on the message id format will need updating too. */
2436
2437 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2438 message_id[6] = '-';
2439 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2440
2441 /* Deal with the case where the host number is set. The value of the number was
2442 checked when it was read, to ensure it isn't too big. The timing granularity is
2443 left in id_resolution so that an appropriate wait can be done after receiving
2444 the message, if necessary (we hope it won't be). */
2445
2446 if (host_number_string != NULL)
2447 {
2448 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2449 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2450 string_base62((long int)(
2451 host_number * (1000000/id_resolution) +
2452 message_id_tv.tv_usec/id_resolution)) + 4);
2453 }
2454
2455 /* Host number not set: final field is just the fractional time at an
2456 appropriate resolution. */
2457
2458 else
2459 {
2460 id_resolution = (BASE_62 == 62)? 500 : 1000;
2461 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2462 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2463 }
2464
2465 /* Add the current message id onto the current process info string if
2466 it will fit. */
2467
2468 (void)string_format(process_info + process_info_len,
2469 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2470
2471 /* If we are using multiple input directories, set up the one for this message
2472 to be the least significant base-62 digit of the time of arrival. Otherwise
2473 ensure that it is an empty string. */
2474
2475 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2476
2477 /* Now that we have the message-id, if there is no message-id: header, generate
2478 one, but only for local (without suppress_local_fixups) or submission mode
2479 messages. This can be user-configured if required, but we had better flatten
2480 any illegal characters therein. */
2481
2482 if (msgid_header == NULL &&
2483 ((sender_host_address == NULL && !suppress_local_fixups)
2484 || submission_mode))
2485 {
2486 uschar *p;
2487 uschar *id_text = US"";
2488 uschar *id_domain = primary_hostname;
2489
2490 /* Permit only letters, digits, dots, and hyphens in the domain */
2491
2492 if (message_id_domain != NULL)
2493 {
2494 uschar *new_id_domain = expand_string(message_id_domain);
2495 if (new_id_domain == NULL)
2496 {
2497 if (!expand_string_forcedfail)
2498 log_write(0, LOG_MAIN|LOG_PANIC,
2499 "expansion of \"%s\" (message_id_header_domain) "
2500 "failed: %s", message_id_domain, expand_string_message);
2501 }
2502 else if (*new_id_domain != 0)
2503 {
2504 id_domain = new_id_domain;
2505 for (p = id_domain; *p != 0; p++)
2506 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2507 }
2508 }
2509
2510 /* Permit all characters except controls and RFC 2822 specials in the
2511 additional text part. */
2512
2513 if (message_id_text != NULL)
2514 {
2515 uschar *new_id_text = expand_string(message_id_text);
2516 if (new_id_text == NULL)
2517 {
2518 if (!expand_string_forcedfail)
2519 log_write(0, LOG_MAIN|LOG_PANIC,
2520 "expansion of \"%s\" (message_id_header_text) "
2521 "failed: %s", message_id_text, expand_string_message);
2522 }
2523 else if (*new_id_text != 0)
2524 {
2525 id_text = new_id_text;
2526 for (p = id_text; *p != 0; p++)
2527 if (mac_iscntrl_or_special(*p)) *p = '-';
2528 }
2529 }
2530
2531 /* Add the header line
2532 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2533 * appended, to preserve classical expectations of header ordering. */
2534
2535 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2536 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2537 (*id_text == 0)? "" : ".", id_text, id_domain);
2538 }
2539
2540 /* If we are to log recipients, keep a copy of the raw ones before any possible
2541 rewriting. Must copy the count, because later ACLs and the local_scan()
2542 function may mess with the real recipients. */
2543
2544 if (LOGGING(received_recipients))
2545 {
2546 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2547 for (i = 0; i < recipients_count; i++)
2548 raw_recipients[i] = string_copy(recipients_list[i].address);
2549 raw_recipients_count = recipients_count;
2550 }
2551
2552 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2553 recipients will get here only if the conditions were right (allow_unqualified_
2554 recipient is TRUE). */
2555
2556 for (i = 0; i < recipients_count; i++)
2557 recipients_list[i].address =
2558 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2559 global_rewrite_rules, rewrite_existflags);
2560
2561 /* If there is no From: header, generate one for local (without
2562 suppress_local_fixups) or submission_mode messages. If there is no sender
2563 address, but the sender is local or this is a local delivery error, use the
2564 originator login. This shouldn't happen for genuine bounces, but might happen
2565 for autoreplies. The addition of From: must be done *before* checking for the
2566 possible addition of a Sender: header, because untrusted_set_sender allows an
2567 untrusted user to set anything in the envelope (which might then get info
2568 From:) but we still want to ensure a valid Sender: if it is required. */
2569
2570 if (from_header == NULL &&
2571 ((sender_host_address == NULL && !suppress_local_fixups)
2572 || submission_mode))
2573 {
2574 uschar *oname = US"";
2575
2576 /* Use the originator_name if this is a locally submitted message and the
2577 caller is not trusted. For trusted callers, use it only if -F was used to
2578 force its value or if we have a non-SMTP message for which -f was not used
2579 to set the sender. */
2580
2581 if (sender_host_address == NULL)
2582 {
2583 if (!trusted_caller || sender_name_forced ||
2584 (!smtp_input && !sender_address_forced))
2585 oname = originator_name;
2586 }
2587
2588 /* For non-locally submitted messages, the only time we use the originator
2589 name is when it was forced by the /name= option on control=submission. */
2590
2591 else
2592 {
2593 if (submission_name != NULL) oname = submission_name;
2594 }
2595
2596 /* Envelope sender is empty */
2597
2598 if (sender_address[0] == 0)
2599 {
2600 uschar *fromstart, *fromend;
2601
2602 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2603 oname, (oname[0] == 0)? "" : " <");
2604 fromend = (oname[0] == 0)? US"" : US">";
2605
2606 if (sender_local || local_error_message)
2607 {
2608 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2609 local_part_quote(originator_login), qualify_domain_sender,
2610 fromend);
2611 }
2612 else if (submission_mode && authenticated_id != NULL)
2613 {
2614 if (submission_domain == NULL)
2615 {
2616 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2617 local_part_quote(authenticated_id), qualify_domain_sender,
2618 fromend);
2619 }
2620 else if (submission_domain[0] == 0) /* empty => whole address set */
2621 {
2622 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2623 fromend);
2624 }
2625 else
2626 {
2627 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2628 local_part_quote(authenticated_id), submission_domain,
2629 fromend);
2630 }
2631 from_header = header_last; /* To get it checked for Sender: */
2632 }
2633 }
2634
2635 /* There is a non-null envelope sender. Build the header using the original
2636 sender address, before any rewriting that might have been done while
2637 verifying it. */
2638
2639 else
2640 {
2641 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2642 oname,
2643 (oname[0] == 0)? "" : " <",
2644 (sender_address_unrewritten == NULL)?
2645 sender_address : sender_address_unrewritten,
2646 (oname[0] == 0)? "" : ">");
2647
2648 from_header = header_last; /* To get it checked for Sender: */
2649 }
2650 }
2651
2652
2653 /* If the sender is local (without suppress_local_fixups), or if we are in
2654 submission mode and there is an authenticated_id, check that an existing From:
2655 is correct, and if not, generate a Sender: header, unless disabled. Any
2656 previously-existing Sender: header was removed above. Note that sender_local,
2657 as well as being TRUE if the caller of exim is not trusted, is also true if a
2658 trusted caller did not supply a -f argument for non-smtp input. To allow
2659 trusted callers to forge From: without supplying -f, we have to test explicitly
2660 here. If the From: header contains more than one address, then the call to
2661 parse_extract_address fails, and a Sender: header is inserted, as required. */
2662
2663 if (from_header != NULL &&
2664 (active_local_from_check &&
2665 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2666 (submission_mode && authenticated_id != NULL))
2667 ))
2668 {
2669 BOOL make_sender = TRUE;
2670 int start, end, domain;
2671 uschar *errmess;
2672 uschar *from_address =
2673 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2674 &start, &end, &domain, FALSE);
2675 uschar *generated_sender_address;
2676
2677 if (submission_mode)
2678 {
2679 if (submission_domain == NULL)
2680 {
2681 generated_sender_address = string_sprintf("%s@%s",
2682 local_part_quote(authenticated_id), qualify_domain_sender);
2683 }
2684 else if (submission_domain[0] == 0) /* empty => full address */
2685 {
2686 generated_sender_address = string_sprintf("%s",
2687 authenticated_id);
2688 }
2689 else
2690 {
2691 generated_sender_address = string_sprintf("%s@%s",
2692 local_part_quote(authenticated_id), submission_domain);
2693 }
2694 }
2695 else
2696 generated_sender_address = string_sprintf("%s@%s",
2697 local_part_quote(originator_login), qualify_domain_sender);
2698
2699 /* Remove permitted prefixes and suffixes from the local part of the From:
2700 address before doing the comparison with the generated sender. */
2701
2702 if (from_address != NULL)
2703 {
2704 int slen;
2705 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2706
2707 if (at != NULL) *at = 0;
2708 from_address += route_check_prefix(from_address, local_from_prefix);
2709 slen = route_check_suffix(from_address, local_from_suffix);
2710 if (slen > 0)
2711 {
2712 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2713 from_address += slen;
2714 }
2715 if (at != NULL) *at = '@';
2716
2717 if (strcmpic(generated_sender_address, from_address) == 0 ||
2718 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2719 make_sender = FALSE;
2720 }
2721
2722 /* We have to cause the Sender header to be rewritten if there are
2723 appropriate rewriting rules. */
2724
2725 if (make_sender)
2726 {
2727 if (submission_mode && submission_name == NULL)
2728 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2729 generated_sender_address);
2730 else
2731 header_add(htype_sender, "%sSender: %s <%s>\n",
2732 resent_prefix,
2733 submission_mode? submission_name : originator_name,
2734 generated_sender_address);
2735 }
2736
2737 /* Ensure that a non-null envelope sender address corresponds to the
2738 submission mode sender address. */
2739
2740 if (submission_mode && sender_address[0] != 0)
2741 {
2742 if (sender_address_unrewritten == NULL)
2743 sender_address_unrewritten = sender_address;
2744 sender_address = generated_sender_address;
2745 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2746 log_write(L_address_rewrite, LOG_MAIN,
2747 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2748 sender_address_unrewritten, generated_sender_address);
2749 }
2750 }
2751
2752 /* If there are any rewriting rules, apply them to the sender address, unless
2753 it has already been rewritten as part of verification for SMTP input. */
2754
2755 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2756 sender_address[0] != 0)
2757 {
2758 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2759 global_rewrite_rules, rewrite_existflags);
2760 DEBUG(D_receive|D_rewrite)
2761 debug_printf("rewritten sender = %s\n", sender_address);
2762 }
2763
2764
2765 /* The headers must be run through rewrite_header(), because it ensures that
2766 addresses are fully qualified, as well as applying any rewriting rules that may
2767 exist.
2768
2769 Qualification of header addresses in a message from a remote host happens only
2770 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2771 appropriate. For local messages, qualification always happens, unless -bnq is
2772 used to explicitly suppress it. No rewriting is done for an unqualified address
2773 that is left untouched.
2774
2775 We start at the second header, skipping our own Received:. This rewriting is
2776 documented as happening *after* recipient addresses are taken from the headers
2777 by the -t command line option. An added Sender: gets rewritten here. */
2778
2779 for (h = header_list->next; h != NULL; h = h->next)
2780 {
2781 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2782 rewrite_existflags, TRUE);
2783 if (newh != NULL) h = newh;
2784 }
2785
2786
2787 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2788 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2789 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2790 exists, this applies to the set of resent- headers rather than the normal set.
2791
2792 The requirement for a recipient header has been removed in RFC 2822. At this
2793 point in the code, earlier versions of Exim added a To: header for locally
2794 submitted messages, and an empty Bcc: header for others. In the light of the
2795 changes in RFC 2822, this was dropped in November 2003. */
2796
2797
2798 /* If there is no date header, generate one if the message originates locally
2799 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2800 submission mode flag is set. Messages without Date: are not valid, but it seems
2801 to be more confusing if Exim adds one to all remotely-originated messages.
2802 As per Message-Id, we prepend if resending, else append.
2803 */
2804
2805 if (!date_header_exists &&
2806 ((sender_host_address == NULL && !suppress_local_fixups)
2807 || submission_mode))
2808 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2809 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2810
2811 search_tidyup(); /* Free any cached resources */
2812
2813 /* Show the complete set of headers if debugging. Note that the first one (the
2814 new Received:) has not yet been set. */
2815
2816 DEBUG(D_receive)
2817 {
2818 debug_printf(">>Headers after rewriting and local additions:\n");
2819 for (h = header_list->next; h != NULL; h = h->next)
2820 debug_printf("%c %s", h->type, h->text);
2821 debug_printf("\n");
2822 }
2823
2824 /* The headers are now complete in store. If we are running in filter
2825 testing mode, that is all this function does. Return TRUE if the message
2826 ended with a dot. */
2827
2828 if (filter_test != FTEST_NONE)
2829 {
2830 process_info[process_info_len] = 0;
2831 return message_ended == END_DOT;
2832 }
2833
2834 /* Cutthrough delivery:
2835 We have to create the Received header now rather than at the end of reception,
2836 so the timestamp behaviour is a change to the normal case.
2837 XXX Ensure this gets documented XXX.
2838 Having created it, send the headers to the destination. */
2839 if (cutthrough.fd >= 0)
2840 {
2841 if (received_count > received_headers_max)
2842 {
2843 cancel_cutthrough_connection("too many headers");
2844 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2845 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2846 "Too many \"Received\" headers",
2847 sender_address,
2848 (sender_fullhost == NULL)? "" : " H=",
2849 (sender_fullhost == NULL)? US"" : sender_fullhost,
2850 (sender_ident == NULL)? "" : " U=",
2851 (sender_ident == NULL)? US"" : sender_ident);
2852 message_id[0] = 0; /* Indicate no message accepted */
2853 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2854 goto TIDYUP; /* Skip to end of function */
2855 }
2856 received_header_gen();
2857 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2858 (void) cutthrough_headers_send();
2859 }
2860
2861
2862 /* Open a new spool file for the data portion of the message. We need
2863 to access it both via a file descriptor and a stream. Try to make the
2864 directory if it isn't there. */
2865
2866 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
2867 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
2868
2869 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
2870 {
2871 if (errno == ENOENT)
2872 {
2873 (void) directory_make(spool_directory,
2874 spool_sname(US"input", message_subdir),
2875 INPUT_DIRECTORY_MODE, TRUE);
2876 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2877 }
2878 if (data_fd < 0)
2879 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2880 spool_name, strerror(errno));
2881 }
2882
2883 /* Make sure the file's group is the Exim gid, and double-check the mode
2884 because the group setting doesn't always get set automatically. */
2885
2886 if (fchown(data_fd, exim_uid, exim_gid))
2887 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2888 "Failed setting ownership on spool file %s: %s",
2889 spool_name, strerror(errno));
2890 (void)fchmod(data_fd, SPOOL_MODE);
2891
2892 /* We now have data file open. Build a stream for it and lock it. We lock only
2893 the first line of the file (containing the message ID) because otherwise there
2894 are problems when Exim is run under Cygwin (I'm told). See comments in
2895 spool_in.c, where the same locking is done. */
2896
2897 data_file = fdopen(data_fd, "w+");
2898 lock_data.l_type = F_WRLCK;
2899 lock_data.l_whence = SEEK_SET;
2900 lock_data.l_start = 0;
2901 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2902
2903 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2904 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2905 errno, strerror(errno));
2906
2907 /* We have an open, locked data file. Write the message id to it to make it
2908 self-identifying. Then read the remainder of the input of this message and
2909 write it to the data file. If the variable next != NULL, it contains the first
2910 data line (which was read as a header but then turned out not to have the right
2911 format); write it (remembering that it might contain binary zeros). The result
2912 of fwrite() isn't inspected; instead we call ferror() below. */
2913
2914 fprintf(data_file, "%s-D\n", message_id);
2915 if (next != NULL)
2916 {
2917 uschar *s = next->text;
2918 int len = next->slen;
2919 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2920 body_linecount++; /* Assumes only 1 line */
2921 }
2922
2923 /* Note that we might already be at end of file, or the logical end of file
2924 (indicated by '.'), or might have encountered an error while writing the
2925 message id or "next" line. */
2926
2927 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2928 {
2929 if (smtp_input)
2930 {
2931 message_ended = read_message_data_smtp(data_file);
2932 receive_linecount++; /* The terminating "." line */
2933 }
2934 else message_ended = read_message_data(data_file);
2935
2936 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2937 message_linecount += body_linecount;
2938
2939 /* Handle premature termination of SMTP */
2940
2941 if (smtp_input && message_ended == END_EOF)
2942 {
2943 Uunlink(spool_name); /* Lose data file when closed */
2944 cancel_cutthrough_connection("sender closed connection");
2945 message_id[0] = 0; /* Indicate no message accepted */
2946 smtp_reply = handle_lost_connection(US"");
2947 smtp_yield = FALSE;
2948 goto TIDYUP; /* Skip to end of function */
2949 }
2950
2951 /* Handle message that is too big. Don't use host_or_ident() in the log
2952 message; we want to see the ident value even for non-remote messages. */
2953
2954 if (message_ended == END_SIZE)
2955 {
2956 Uunlink(spool_name); /* Lose the data file when closed */
2957 cancel_cutthrough_connection("mail too big");
2958 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2959
2960 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2961 "message too big: read=%d max=%d",
2962 sender_address,
2963 (sender_fullhost == NULL)? "" : " H=",
2964 (sender_fullhost == NULL)? US"" : sender_fullhost,
2965 (sender_ident == NULL)? "" : " U=",
2966 (sender_ident == NULL)? US"" : sender_ident,
2967 message_size,
2968 thismessage_size_limit);
2969
2970 if (smtp_input)
2971 {
2972 smtp_reply = US"552 Message size exceeds maximum permitted";
2973 message_id[0] = 0; /* Indicate no message accepted */
2974 goto TIDYUP; /* Skip to end of function */
2975 }
2976 else
2977 {
2978 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2979 give_local_error(ERRMESS_TOOBIG,
2980 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2981 US"message rejected: ", error_rc, data_file, header_list);
2982 /* Does not return */
2983 }
2984 }
2985 }
2986
2987 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2988 example, there may be some expansion in an ACL that uses a timer.) */
2989
2990 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2991
2992 /* The message body has now been read into the data file. Call fflush() to
2993 empty the buffers in C, and then call fsync() to get the data written out onto
2994 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2995 having to do this). If there was an I/O error on either input or output,
2996 attempt to send an error message, and unlink the spool file. For non-SMTP input
2997 we can then give up. Note that for SMTP input we must swallow the remainder of
2998 the input in cases of output errors, since the far end doesn't expect to see
2999 anything until the terminating dot line is sent. */
3000
3001 if (fflush(data_file) == EOF || ferror(data_file) ||
3002 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3003 {
3004 uschar *msg_errno = US strerror(errno);
3005 BOOL input_error = (receive_ferror)() != 0;
3006 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3007 input_error? "Input read" : "Spool write",
3008 msg_errno,
3009 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3010
3011 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3012 Uunlink(spool_name); /* Lose the data file */
3013 cancel_cutthrough_connection("error writing spoolfile");
3014
3015 if (smtp_input)
3016 {
3017 if (input_error)
3018 smtp_reply = US"451 Error while reading input data";
3019 else
3020 {
3021 smtp_reply = US"451 Error while writing spool file";
3022 receive_swallow_smtp();
3023 }
3024 message_id[0] = 0; /* Indicate no message accepted */
3025 goto TIDYUP; /* Skip to end of function */
3026 }
3027
3028 else
3029 {
3030 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3031 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3032 header_list);
3033 /* Does not return */
3034 }
3035 }
3036
3037
3038 /* No I/O errors were encountered while writing the data file. */
3039
3040 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3041
3042
3043 /* If there were any bad addresses extracted by -t, or there were no recipients
3044 left after -t, send a message to the sender of this message, or write it to
3045 stderr if the error handling option is set that way. Note that there may
3046 legitimately be no recipients for an SMTP message if they have all been removed
3047 by "discard".
3048
3049 We need to rewind the data file in order to read it. In the case of no
3050 recipients or stderr error writing, throw the data file away afterwards, and
3051 exit. (This can't be SMTP, which always ensures there's at least one
3052 syntactically good recipient address.) */
3053
3054 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3055 {
3056 DEBUG(D_receive)
3057 {
3058 if (recipients_count == 0) debug_printf("*** No recipients\n");
3059 if (bad_addresses != NULL)
3060 {
3061 error_block *eblock = bad_addresses;
3062 debug_printf("*** Bad address(es)\n");
3063 while (eblock != NULL)
3064 {
3065 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3066 eblock = eblock->next;
3067 }
3068 }
3069 }
3070
3071 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3072
3073 /* If configured to send errors to the sender, but this fails, force
3074 a failure error code. We use a special one for no recipients so that it
3075 can be detected by the autoreply transport. Otherwise error_rc is set to
3076 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3077 it is EXIT_SUCCESS. */
3078
3079 if (error_handling == ERRORS_SENDER)
3080 {
3081 if (!moan_to_sender(
3082 (bad_addresses == NULL)?
3083 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3084 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3085 bad_addresses, header_list, data_file, FALSE))
3086 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3087 }
3088 else
3089 {
3090 if (bad_addresses == NULL)
3091 {
3092 if (extracted_ignored)
3093 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3094 else
3095 fprintf(stderr, "exim: no recipients in message\n");
3096 }
3097 else
3098 {
3099 fprintf(stderr, "exim: invalid address%s",
3100 (bad_addresses->next == NULL)? ":" : "es:\n");
3101 while (bad_addresses != NULL)
3102 {
3103 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3104 bad_addresses->text2);
3105 bad_addresses = bad_addresses->next;
3106 }
3107 }
3108 }
3109
3110 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3111 {
3112 Uunlink(spool_name);
3113 (void)fclose(data_file);
3114 exim_exit(error_rc);
3115 }
3116 }
3117
3118 /* Data file successfully written. Generate text for the Received: header by
3119 expanding the configured string, and adding a timestamp. By leaving this
3120 operation till now, we ensure that the timestamp is the time that message
3121 reception was completed. However, this is deliberately done before calling the
3122 data ACL and local_scan().
3123
3124 This Received: header may therefore be inspected by the data ACL and by code in
3125 the local_scan() function. When they have run, we update the timestamp to be
3126 the final time of reception.
3127
3128 If there is just one recipient, set up its value in the $received_for variable
3129 for use when we generate the Received: header.
3130
3131 Note: the checking for too many Received: headers is handled by the delivery
3132 code. */
3133 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3134
3135 if (received_header->text == NULL) /* Non-cutthrough case */
3136 {
3137 received_header_gen();
3138
3139 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3140
3141 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3142 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3143
3144 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3145 now, before running the DATA ACL. */
3146
3147 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3148 }
3149 else
3150 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3151 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3152
3153 /* If an ACL is specified for checking things at this stage of reception of a
3154 message, run it, unless all the recipients were removed by "discard" in earlier
3155 ACLs. That is the only case in which recipients_count can be zero at this
3156 stage. Set deliver_datafile to point to the data file so that $message_body and
3157 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3158 */
3159
3160 deliver_datafile = data_fd;
3161 user_msg = NULL;
3162
3163 enable_dollar_recipients = TRUE;
3164
3165 if (recipients_count == 0)
3166 {
3167 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3168 }
3169 else
3170 {
3171 /* Handle interactive SMTP messages */
3172
3173 if (smtp_input && !smtp_batched_input)
3174 {
3175
3176 #ifndef DISABLE_DKIM
3177 if (!dkim_disable_verify)
3178 {
3179 /* Finish verification, this will log individual signature results to
3180 the mainlog */
3181 dkim_exim_verify_finish();
3182
3183 /* Check if we must run the DKIM ACL */
3184 if ((acl_smtp_dkim != NULL) &&
3185 (dkim_verify_signers != NULL) &&
3186 (dkim_verify_signers[0] != '\0'))
3187 {
3188 uschar *dkim_verify_signers_expanded =
3189 expand_string(dkim_verify_signers);
3190 if (dkim_verify_signers_expanded == NULL)
3191 {
3192 log_write(0, LOG_MAIN|LOG_PANIC,
3193 "expansion of dkim_verify_signers option failed: %s",
3194 expand_string_message);
3195 }
3196 else
3197 {
3198 int sep = 0;
3199 const uschar *ptr = dkim_verify_signers_expanded;
3200 uschar *item = NULL;
3201 uschar *seen_items = NULL;
3202 int seen_items_size = 0;
3203 int seen_items_offset = 0;
3204 uschar itembuf[256];
3205 /* Default to OK when no items are present */
3206 rc = OK;
3207 while ((item = string_nextinlist(&ptr, &sep,
3208 itembuf,
3209 sizeof(itembuf))))
3210 {
3211 /* Prevent running ACL for an empty item */
3212 if (!item || (item[0] == '\0')) continue;
3213
3214 /* Only run ACL once for each domain or identity,
3215 no matter how often it appears in the expanded list. */
3216 if (seen_items)
3217 {
3218 uschar *seen_item = NULL;
3219 uschar seen_item_buf[256];
3220 const uschar *seen_items_list = seen_items;
3221 BOOL seen_this_item = FALSE;
3222
3223 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3224 seen_item_buf,
3225 sizeof(seen_item_buf))))
3226 if (Ustrcmp(seen_item,item) == 0)
3227 {
3228 seen_this_item = TRUE;
3229 break;
3230 }
3231
3232 if (seen_this_item)
3233 {
3234 DEBUG(D_receive)
3235 debug_printf("acl_smtp_dkim: skipping signer %s, "
3236 "already seen\n", item);
3237 continue;
3238 }
3239
3240 seen_items = string_append(seen_items, &seen_items_size,
3241 &seen_items_offset, 1, ":");
3242 }
3243
3244 seen_items = string_append(seen_items, &seen_items_size,
3245 &seen_items_offset, 1, item);
3246 seen_items[seen_items_offset] = '\0';
3247
3248 DEBUG(D_receive)
3249 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3250 item);
3251
3252 dkim_exim_acl_setup(item);
3253 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3254 &user_msg, &log_msg);
3255
3256 if (rc != OK)
3257 {
3258 DEBUG(D_receive)
3259 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3260 "skipping remaining items\n", rc, item);
3261 cancel_cutthrough_connection("dkim acl not ok");
3262 break;
3263 }
3264 }
3265 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3266 if (rc == DISCARD)
3267 {
3268 recipients_count = 0;
3269 blackholed_by = US"DKIM ACL";
3270 if (log_msg != NULL)
3271 blackhole_log_msg = string_sprintf(": %s", log_msg);
3272 }
3273 else if (rc != OK)
3274 {
3275 Uunlink(spool_name);
3276 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3277 smtp_yield = FALSE; /* No more messages after dropped connection */
3278 smtp_reply = US""; /* Indicate reply already sent */
3279 message_id[0] = 0; /* Indicate no message accepted */
3280 goto TIDYUP; /* Skip to end of function */
3281 }
3282 }
3283 }
3284 }
3285 #endif /* DISABLE_DKIM */
3286
3287 #ifdef WITH_CONTENT_SCAN
3288 if (recipients_count > 0 &&
3289 acl_smtp_mime != NULL &&
3290 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3291 goto TIDYUP;
3292 #endif /* WITH_CONTENT_SCAN */
3293
3294 #ifdef EXPERIMENTAL_DMARC
3295 dmarc_up = dmarc_store_data(from_header);
3296 #endif /* EXPERIMENTAL_DMARC */
3297
3298 #ifndef DISABLE_PRDR
3299 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3300 {
3301 unsigned int c;
3302 int all_pass = OK;
3303 int all_fail = FAIL;
3304
3305 smtp_printf("353 PRDR content analysis beginning\r\n");
3306 /* Loop through recipients, responses must be in same order received */
3307 for (c = 0; recipients_count > c; c++)
3308 {
3309 uschar * addr= recipients_list[c].address;
3310 uschar * msg= US"PRDR R=<%s> %s";
3311 uschar * code;
3312 DEBUG(D_receive)
3313 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3314 addr, c+1, recipients_count);
3315 rc = acl_check(ACL_WHERE_PRDR, addr,
3316 acl_smtp_data_prdr, &user_msg, &log_msg);
3317
3318 /* If any recipient rejected content, indicate it in final message */
3319 all_pass |= rc;
3320 /* If all recipients rejected, indicate in final message */
3321 all_fail &= rc;
3322
3323 switch (rc)
3324 {
3325 case OK: case DISCARD: code = US"250"; break;
3326 case DEFER: code = US"450"; break;
3327 default: code = US"550"; break;
3328 }
3329 if (user_msg != NULL)
3330 smtp_user_msg(code, user_msg);
3331 else
3332 {
3333 switch (rc)
3334 {
3335 case OK: case DISCARD:
3336 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3337 case DEFER:
3338 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3339 default:
3340 msg = string_sprintf(CS msg, addr, "refusal"); break;
3341 }
3342 smtp_user_msg(code, msg);
3343 }
3344 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3345 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3346 else log_write(0, LOG_MAIN, "%s", CS msg);
3347
3348 if (rc != OK) { receive_remove_recipient(addr); c--; }
3349 }
3350 /* Set up final message, used if data acl gives OK */
3351 smtp_reply = string_sprintf("%s id=%s message %s",
3352 all_fail == FAIL ? US"550" : US"250",
3353 message_id,
3354 all_fail == FAIL
3355 ? US"rejected for all recipients"
3356 : all_pass == OK
3357 ? US"accepted"
3358 : US"accepted for some recipients");
3359 if (recipients_count == 0)
3360 {
3361 message_id[0] = 0; /* Indicate no message accepted */
3362 goto TIDYUP;
3363 }
3364 }
3365 else
3366 prdr_requested = FALSE;
3367 #endif /* !DISABLE_PRDR */
3368
3369 /* Check the recipients count again, as the MIME ACL might have changed
3370 them. */
3371
3372 if (acl_smtp_data != NULL && recipients_count > 0)
3373 {
3374 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3375 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3376 if (rc == DISCARD)
3377 {
3378 recipients_count = 0;
3379 blackholed_by = US"DATA ACL";
3380 if (log_msg != NULL)
3381 blackhole_log_msg = string_sprintf(": %s", log_msg);
3382 cancel_cutthrough_connection("data acl discard");
3383 }
3384 else if (rc != OK)
3385 {
3386 Uunlink(spool_name);
3387 cancel_cutthrough_connection("data acl not ok");
3388 #ifdef WITH_CONTENT_SCAN
3389 unspool_mbox();
3390 #endif
3391 #ifdef EXPERIMENTAL_DCC
3392 dcc_ok = 0;
3393 #endif
3394 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3395 smtp_yield = FALSE; /* No more messages after dropped connection */
3396 smtp_reply = US""; /* Indicate reply already sent */
3397 message_id[0] = 0; /* Indicate no message accepted */
3398 goto TIDYUP; /* Skip to end of function */
3399 }
3400 }
3401 }
3402
3403 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3404 we cannot take different actions for permanent and temporary rejections. */
3405
3406 else
3407 {
3408
3409 #ifdef WITH_CONTENT_SCAN
3410 if (acl_not_smtp_mime != NULL &&
3411 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3412 &blackholed_by))
3413 goto TIDYUP;
3414 #endif /* WITH_CONTENT_SCAN */
3415
3416 if (acl_not_smtp != NULL)
3417 {
3418 uschar *user_msg, *log_msg;
3419 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3420 if (rc == DISCARD)
3421 {
3422 recipients_count = 0;
3423 blackholed_by = US"non-SMTP ACL";
3424 if (log_msg != NULL)
3425 blackhole_log_msg = string_sprintf(": %s", log_msg);
3426 }
3427 else if (rc != OK)
3428 {
3429 Uunlink(spool_name);
3430 #ifdef WITH_CONTENT_SCAN
3431 unspool_mbox();
3432 #endif
3433 #ifdef EXPERIMENTAL_DCC
3434 dcc_ok = 0;
3435 #endif
3436 /* The ACL can specify where rejections are to be logged, possibly
3437 nowhere. The default is main and reject logs. */
3438
3439 if (log_reject_target != 0)
3440 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3441 sender_address, log_msg);
3442
3443 if (user_msg == NULL) user_msg = US"local configuration problem";
3444 if (smtp_batched_input)
3445 {
3446 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3447 /* Does not return */
3448 }
3449 else
3450 {
3451 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3452 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3453 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3454 header_list);
3455 /* Does not return */
3456 }
3457 }
3458 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3459 }
3460 }
3461
3462 /* The applicable ACLs have been run */
3463
3464 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3465 if (queue_only_policy) queued_by = US"ACL";
3466 }
3467
3468 #ifdef WITH_CONTENT_SCAN
3469 unspool_mbox();
3470 #endif
3471
3472 #ifdef EXPERIMENTAL_DCC
3473 dcc_ok = 0;
3474 #endif
3475
3476
3477 /* The final check on the message is to run the scan_local() function. The
3478 version supplied with Exim always accepts, but this is a hook for sysadmins to
3479 supply their own checking code. The local_scan() function is run even when all
3480 the recipients have been discarded. */
3481
3482 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3483
3484 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3485 deleted, and the incident gets logged. */
3486
3487 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3488 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3489 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3490 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3491
3492 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",