Merge branch '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') { body_linecount++; linelength = -1; }
686 else ch_state = 0;
687 break;
688
689 case 2:
690 body_linecount++; /* After unwritten "\r" */
691 if (linelength > max_received_linelength)
692 max_received_linelength = linelength;
693 if (ch == '\n')
694 {
695 ch_state = 1;
696 linelength = -1;
697 }
698 else
699 {
700 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
701 if (ch == '\r') continue;
702 ch_state = 0;
703 linelength = 0;
704 }
705 break;
706
707 case 3: /* After "\n." (\n written, dot not) */
708 if (ch == '\n') return END_DOT;
709 if (ch == '\r') { ch_state = 4; continue; }
710 message_size++;
711 linelength++;
712 if (fputc('.', fout) == EOF) return END_WERROR;
713 ch_state = 0;
714 break;
715
716 case 4: /* After "\n.\r" (\n written, rest not) */
717 if (ch == '\n') return END_DOT;
718 message_size += 2;
719 body_linecount++;
720 if (fputs(".\n", fout) == EOF) return END_WERROR;
721 if (ch == '\r') { ch_state = 2; continue; }
722 ch_state = 0;
723 break;
724 }
725
726 linelength++;
727 if (fputc(ch, fout) == EOF) return END_WERROR;
728 if (++message_size > thismessage_size_limit) return END_SIZE;
729 }
730
731 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
732 the message ends with a newline, and we must also write any characters that
733 were saved up while testing for an ending dot. */
734
735 if (ch_state != 1)
736 {
737 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
738 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
739 message_size += Ustrlen(ends[ch_state]);
740 body_linecount++;
741 }
742
743 return END_EOF;
744 }
745
746
747
748
749 /*************************************************
750 * Read data portion of an SMTP message *
751 *************************************************/
752
753 /* This function is called to read the remainder of an SMTP message (after the
754 headers), or to skip over it when an error has occurred. In this case, the
755 output file is passed as NULL.
756
757 If any line begins with a dot, that character is skipped. The input should only
758 be successfully terminated by CR LF . CR LF unless it is local (non-network)
759 SMTP, in which case the CRs are optional, but...
760
761 FUDGE: It seems that sites on the net send out messages with just LF
762 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
763 we make the CRs optional in all cases.
764
765 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
766 well, so that there are no CRs in spooled messages. However, the message
767 terminating dot is not recognized between two bare CRs.
768
769 Arguments:
770 fout a FILE to which to write the message; NULL if skipping
771
772 Returns: One of the END_xxx values indicating why it stopped reading
773 */
774
775 static int
776 read_message_data_smtp(FILE *fout)
777 {
778 int ch_state = 0;
779 int ch;
780 register int linelength = 0;
781
782 while ((ch = (receive_getc)()) != EOF)
783 {
784 if (ch == 0) body_zerocount++;
785 switch (ch_state)
786 {
787 case 0: /* After LF or CRLF */
788 if (ch == '.')
789 {
790 ch_state = 3;
791 continue; /* Don't ever write . after LF */
792 }
793 ch_state = 1;
794
795 /* Else fall through to handle as normal uschar. */
796
797 case 1: /* Normal state */
798 if (ch == '\n')
799 {
800 ch_state = 0;
801 body_linecount++;
802 if (linelength > max_received_linelength)
803 max_received_linelength = linelength;
804 linelength = -1;
805 }
806 else if (ch == '\r')
807 {
808 ch_state = 2;
809 continue;
810 }
811 break;
812
813 case 2: /* After (unwritten) CR */
814 body_linecount++;
815 if (linelength > max_received_linelength)
816 max_received_linelength = linelength;
817 linelength = -1;
818 if (ch == '\n')
819 {
820 ch_state = 0;
821 }
822 else
823 {
824 message_size++;
825 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
826 (void) cutthrough_put_nl();
827 if (ch != '\r') ch_state = 1; else continue;
828 }
829 break;
830
831 case 3: /* After [CR] LF . */
832 if (ch == '\n')
833 return END_DOT;
834 if (ch == '\r')
835 {
836 ch_state = 4;
837 continue;
838 }
839 /* The dot was removed at state 3. For a doubled dot, here, reinstate
840 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
841 and to file below. */
842 if (ch == '.')
843 {
844 uschar c= ch;
845 (void) cutthrough_puts(&c, 1);
846 }
847 ch_state = 1;
848 break;
849
850 case 4: /* After [CR] LF . CR */
851 if (ch == '\n') return END_DOT;
852 message_size++;
853 body_linecount++;
854 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
855 (void) cutthrough_put_nl();
856 if (ch == '\r')
857 {
858 ch_state = 2;
859 continue;
860 }
861 ch_state = 1;
862 break;
863 }
864
865 /* Add the character to the spool file, unless skipping; then loop for the
866 next. */
867
868 message_size++;
869 linelength++;
870 if (fout != NULL)
871 {
872 if (fputc(ch, fout) == EOF) return END_WERROR;
873 if (message_size > thismessage_size_limit) return END_SIZE;
874 }
875 if(ch == '\n')
876 (void) cutthrough_put_nl();
877 else
878 {
879 uschar c= ch;
880 (void) cutthrough_puts(&c, 1);
881 }
882 }
883
884 /* Fall through here if EOF encountered. This indicates some kind of error,
885 since a correct message is terminated by [CR] LF . [CR] LF. */
886
887 return END_EOF;
888 }
889
890
891
892
893 /*************************************************
894 * Swallow SMTP message *
895 *************************************************/
896
897 /* This function is called when there has been some kind of error while reading
898 an SMTP message, and the remaining data may need to be swallowed. It is global
899 because it is called from smtp_closedown() to shut down an incoming call
900 tidily.
901
902 Argument: a FILE from which to read the message
903 Returns: nothing
904 */
905
906 void
907 receive_swallow_smtp(void)
908 {
909 if (message_ended >= END_NOTENDED)
910 message_ended = read_message_data_smtp(NULL);
911 }
912
913
914
915 /*************************************************
916 * Handle lost SMTP connection *
917 *************************************************/
918
919 /* This function logs connection loss incidents and generates an appropriate
920 SMTP response.
921
922 Argument: additional data for the message
923 Returns: the SMTP response
924 */
925
926 static uschar *
927 handle_lost_connection(uschar *s)
928 {
929 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
930 "%s lost while reading message data%s", smtp_get_connection_info(), s);
931 return US"421 Lost incoming connection";
932 }
933
934
935
936
937 /*************************************************
938 * Handle a non-smtp reception error *
939 *************************************************/
940
941 /* This function is called for various errors during the reception of non-SMTP
942 messages. It either sends a message to the sender of the problem message, or it
943 writes to the standard error stream.
944
945 Arguments:
946 errcode code for moan_to_sender(), identifying the error
947 text1 first message text, passed to moan_to_sender()
948 text2 second message text, used only for stderrr
949 error_rc code to pass to exim_exit if no problem
950 f FILE containing body of message (may be stdin)
951 hptr pointer to instore headers or NULL
952
953 Returns: calls exim_exit(), which does not return
954 */
955
956 static void
957 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
958 FILE *f, header_line *hptr)
959 {
960 if (error_handling == ERRORS_SENDER)
961 {
962 error_block eblock;
963 eblock.next = NULL;
964 eblock.text1 = text1;
965 eblock.text2 = US"";
966 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
967 error_rc = EXIT_FAILURE;
968 }
969 else
970 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
971 (void)fclose(f);
972 exim_exit(error_rc);
973 }
974
975
976
977 /*************************************************
978 * Add header lines set up by ACL *
979 *************************************************/
980
981 /* This function is called to add the header lines that were set up by
982 statements in an ACL to the list of headers in memory. It is done in two stages
983 like this, because when the ACL for RCPT is running, the other headers have not
984 yet been received. This function is called twice; once just before running the
985 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
986 are visible to the DATA ACL.
987
988 Originally these header lines were added at the end. Now there is support for
989 three different places: top, bottom, and after the Received: header(s). There
990 will always be at least one Received: header, even if it is marked deleted, and
991 even if something else has been put in front of it.
992
993 Arguments:
994 acl_name text to identify which ACL
995
996 Returns: nothing
997 */
998
999 static void
1000 add_acl_headers(int where, uschar *acl_name)
1001 {
1002 header_line *h, *next;
1003 header_line *last_received = NULL;
1004
1005 switch(where)
1006 {
1007 case ACL_WHERE_DKIM:
1008 case ACL_WHERE_MIME:
1009 case ACL_WHERE_DATA:
1010 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1011 {
1012 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1013 " will not take effect on cutthrough deliveries");
1014 return;
1015 }
1016 }
1017
1018 if (acl_removed_headers != NULL)
1019 {
1020 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1021
1022 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1023 {
1024 const uschar * list = acl_removed_headers;
1025 int sep = ':'; /* This is specified as a colon-separated list */
1026 uschar *s;
1027 uschar buffer[128];
1028
1029 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1030 if (header_testname(h, s, Ustrlen(s), FALSE))
1031 {
1032 h->type = htype_old;
1033 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1034 }
1035 }
1036 acl_removed_headers = NULL;
1037 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1038 }
1039
1040 if (acl_added_headers == NULL) return;
1041 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1042
1043 for (h = acl_added_headers; h != NULL; h = next)
1044 {
1045 next = h->next;
1046
1047 switch(h->type)
1048 {
1049 case htype_add_top:
1050 h->next = header_list;
1051 header_list = h;
1052 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1053 break;
1054
1055 case htype_add_rec:
1056 if (last_received == NULL)
1057 {
1058 last_received = header_list;
1059 while (!header_testname(last_received, US"Received", 8, FALSE))
1060 last_received = last_received->next;
1061 while (last_received->next != NULL &&
1062 header_testname(last_received->next, US"Received", 8, FALSE))
1063 last_received = last_received->next;
1064 }
1065 h->next = last_received->next;
1066 last_received->next = h;
1067 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1068 break;
1069
1070 case htype_add_rfc:
1071 /* add header before any header which is NOT Received: or Resent- */
1072 last_received = header_list;
1073 while ( (last_received->next != NULL) &&
1074 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1075 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1076 last_received = last_received->next;
1077 /* last_received now points to the last Received: or Resent-* header
1078 in an uninterrupted chain of those header types (seen from the beginning
1079 of all headers. Our current header must follow it. */
1080 h->next = last_received->next;
1081 last_received->next = h;
1082 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1083 break;
1084
1085 default:
1086 h->next = NULL;
1087 header_last->next = h;
1088 break;
1089 }
1090
1091 if (h->next == NULL) header_last = h;
1092
1093 /* Check for one of the known header types (From:, To:, etc.) though in
1094 practice most added headers are going to be "other". Lower case
1095 identification letters are never stored with the header; they are used
1096 for existence tests when messages are received. So discard any lower case
1097 flag values. */
1098
1099 h->type = header_checkname(h, FALSE);
1100 if (h->type >= 'a') h->type = htype_other;
1101
1102 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1103 }
1104
1105 acl_added_headers = NULL;
1106 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1107 }
1108
1109
1110
1111 /*************************************************
1112 * Add host information for log line *
1113 *************************************************/
1114
1115 /* Called for acceptance and rejecting log lines. This adds information about
1116 the calling host to a string that is being built dynamically.
1117
1118 Arguments:
1119 s the dynamic string
1120 sizeptr points to the size variable
1121 ptrptr points to the pointer variable
1122
1123 Returns: the extended string
1124 */
1125
1126 static uschar *
1127 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1128 {
1129 if (sender_fullhost)
1130 {
1131 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1132 s = string_cat(s, sizeptr, ptrptr, US" DS");
1133 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1134 if (LOGGING(incoming_interface) && interface_address != NULL)
1135 {
1136 s = string_cat(s, sizeptr, ptrptr,
1137 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1138 }
1139 }
1140 if (sender_ident != NULL)
1141 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1142 if (received_protocol != NULL)
1143 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1144 return s;
1145 }
1146
1147
1148
1149 #ifdef WITH_CONTENT_SCAN
1150
1151 /*************************************************
1152 * Run the MIME ACL on a message *
1153 *************************************************/
1154
1155 /* This code is in a subroutine so that it can be used for both SMTP
1156 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1157
1158 Arguments:
1159 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1160 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1161 smtp_reply_ptr Where SMTP reply is being built
1162 blackholed_by_ptr Where "blackholed by" message is being built
1163
1164 Returns: TRUE to carry on; FALSE to abandon the message
1165 */
1166
1167 static BOOL
1168 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1169 uschar **blackholed_by_ptr)
1170 {
1171 FILE *mbox_file;
1172 uschar rfc822_file_path[2048];
1173 unsigned long mbox_size;
1174 header_line *my_headerlist;
1175 uschar *user_msg, *log_msg;
1176 int mime_part_count_buffer = -1;
1177 int rc = OK;
1178
1179 memset(CS rfc822_file_path,0,2048);
1180
1181 /* check if it is a MIME message */
1182 my_headerlist = header_list;
1183 while (my_headerlist != NULL)
1184 {
1185 /* skip deleted headers */
1186 if (my_headerlist->type == '*')
1187 {
1188 my_headerlist = my_headerlist->next;
1189 continue;
1190 }
1191 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1192 {
1193 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1194 goto DO_MIME_ACL;
1195 }
1196 my_headerlist = my_headerlist->next;
1197 }
1198
1199 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1200 return TRUE;
1201
1202 DO_MIME_ACL:
1203 /* make sure the eml mbox file is spooled up */
1204 mbox_file = spool_mbox(&mbox_size, NULL);
1205 if (mbox_file == NULL) {
1206 /* error while spooling */
1207 log_write(0, LOG_MAIN|LOG_PANIC,
1208 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1209 Uunlink(spool_name);
1210 unspool_mbox();
1211 #ifdef EXPERIMENTAL_DCC
1212 dcc_ok = 0;
1213 #endif
1214 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1215 message_id[0] = 0; /* Indicate no message accepted */
1216 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1217 return FALSE; /* Indicate skip to end of receive function */
1218 };
1219
1220 mime_is_rfc822 = 0;
1221
1222 MIME_ACL_CHECK:
1223 mime_part_count = -1;
1224 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1225 (void)fclose(mbox_file);
1226
1227 if (Ustrlen(rfc822_file_path) > 0)
1228 {
1229 mime_part_count = mime_part_count_buffer;
1230
1231 if (unlink(CS rfc822_file_path) == -1)
1232 {
1233 log_write(0, LOG_PANIC,
1234 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1235 goto END_MIME_ACL;
1236 }
1237 }
1238
1239 /* check if we must check any message/rfc822 attachments */
1240 if (rc == OK)
1241 {
1242 uschar temp_path[1024];
1243 struct dirent * entry;
1244 DIR * tempdir;
1245
1246 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1247 spool_directory, message_id);
1248
1249 tempdir = opendir(CS temp_path);
1250 for (;;)
1251 {
1252 if (!(entry = readdir(tempdir)))
1253 break;
1254 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1255 {
1256 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1257 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1258 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1259 rfc822_file_path);
1260 break;
1261 }
1262 }
1263 closedir(tempdir);
1264
1265 if (entry)
1266 {
1267 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1268 {
1269 /* set RFC822 expansion variable */
1270 mime_is_rfc822 = 1;
1271 mime_part_count_buffer = mime_part_count;
1272 goto MIME_ACL_CHECK;
1273 }
1274 log_write(0, LOG_PANIC,
1275 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1276 unlink(CS rfc822_file_path);
1277 }
1278 }
1279
1280 END_MIME_ACL:
1281 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1282 if (rc == DISCARD)
1283 {
1284 recipients_count = 0;
1285 *blackholed_by_ptr = US"MIME ACL";
1286 }
1287 else if (rc != OK)
1288 {
1289 Uunlink(spool_name);
1290 unspool_mbox();
1291 #ifdef EXPERIMENTAL_DCC
1292 dcc_ok = 0;
1293 #endif
1294 if ( smtp_input
1295 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1296 {
1297 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1298 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1299 }
1300 message_id[0] = 0; /* Indicate no message accepted */
1301 return FALSE; /* Cause skip to end of receive function */
1302 }
1303
1304 return TRUE;
1305 }
1306
1307 #endif /* WITH_CONTENT_SCAN */
1308
1309
1310
1311 void
1312 received_header_gen(void)
1313 {
1314 uschar *received;
1315 uschar *timestamp;
1316 header_line *received_header= header_list;
1317
1318 timestamp = expand_string(US"${tod_full}");
1319 if (recipients_count == 1) received_for = recipients_list[0].address;
1320 received = expand_string(received_header_text);
1321 received_for = NULL;
1322
1323 if (!received)
1324 {
1325 if(spool_name[0] != 0)
1326 Uunlink(spool_name); /* Lose the data file */
1327 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1328 "(received_header_text) failed: %s", string_printing(received_header_text),
1329 expand_string_message);
1330 }
1331
1332 /* The first element on the header chain is reserved for the Received header,
1333 so all we have to do is fill in the text pointer, and set the type. However, if
1334 the result of the expansion is an empty string, we leave the header marked as
1335 "old" so as to refrain from adding a Received header. */
1336
1337 if (received[0] == 0)
1338 {
1339 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1340 received_header->type = htype_old;
1341 }
1342 else
1343 {
1344 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1345 received_header->type = htype_received;
1346 }
1347
1348 received_header->slen = Ustrlen(received_header->text);
1349
1350 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1351 received_header->type, received_header->text);
1352 }
1353
1354
1355
1356 /*************************************************
1357 * Receive message *
1358 *************************************************/
1359
1360 /* Receive a message on the given input, and put it into a pair of spool files.
1361 Either a non-null list of recipients, or the extract flag will be true, or
1362 both. The flag sender_local is true for locally generated messages. The flag
1363 submission_mode is true if an ACL has obeyed "control = submission". The flag
1364 suppress_local_fixups is true if an ACL has obeyed "control =
1365 suppress_local_fixups" or -G was passed on the command-line.
1366 The flag smtp_input is true if the message is to be
1367 handled using SMTP conventions about termination and lines starting with dots.
1368 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1369
1370 If a message was successfully read, message_id[0] will be non-zero.
1371
1372 The general actions of this function are:
1373
1374 . Read the headers of the message (if any) into a chain of store
1375 blocks.
1376
1377 . If there is a "sender:" header and the message is locally originated,
1378 throw it away, unless the caller is trusted, or unless
1379 active_local_sender_retain is set - which can only happen if
1380 active_local_from_check is false.
1381
1382 . If recipients are to be extracted from the message, build the
1383 recipients list from the headers, removing any that were on the
1384 original recipients list (unless extract_addresses_remove_arguments is
1385 false), and at the same time, remove any bcc header that may be present.
1386
1387 . Get the spool file for the data, sort out its unique name, open
1388 and lock it (but don't give it the name yet).
1389
1390 . Generate a "Message-Id" header if the message doesn't have one, for
1391 locally-originated messages.
1392
1393 . Generate a "Received" header.
1394
1395 . Ensure the recipients list is fully qualified and rewritten if necessary.
1396
1397 . If there are any rewriting rules, apply them to the sender address
1398 and also to the headers.
1399
1400 . If there is no from: header, generate one, for locally-generated messages
1401 and messages in "submission mode" only.
1402
1403 . If the sender is local, check that from: is correct, and if not, generate
1404 a Sender: header, unless message comes from a trusted caller, or this
1405 feature is disabled by active_local_from_check being false.
1406
1407 . If there is no "date" header, generate one, for locally-originated
1408 or submission mode messages only.
1409
1410 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1411 dot_ends mode, to the data file. Leave it open, to hold the lock.
1412
1413 . Write the envelope and the headers to a new file.
1414
1415 . Set the name for the header file; close it.
1416
1417 . Set the name for the data file; close it.
1418
1419 Because this function can potentially be called many times in a single
1420 SMTP connection, all store should be got by store_get(), so that it will be
1421 automatically retrieved after the message is accepted.
1422
1423 FUDGE: It seems that sites on the net send out messages with just LF
1424 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1425 we make the CRs optional in all cases.
1426
1427 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1428 new regime is now in place in which bare CRs in header lines are turned into LF
1429 followed by a space, so as not to terminate the header line.
1430
1431 February 2004: A bare LF in a header line in a message whose first line was
1432 terminated by CRLF is treated in the same way as a bare CR.
1433
1434 Arguments:
1435 extract_recip TRUE if recipients are to be extracted from the message's
1436 headers
1437
1438 Returns: TRUE there are more messages to be read (SMTP input)
1439 FALSE there are no more messages to be read (non-SMTP input
1440 or SMTP connection collapsed, or other failure)
1441
1442 When reading a message for filter testing, the returned value indicates
1443 whether the headers (which is all that is read) were terminated by '.' or
1444 not. */
1445
1446 BOOL
1447 receive_msg(BOOL extract_recip)
1448 {
1449 int i;
1450 int rc = FAIL;
1451 int msg_size = 0;
1452 int process_info_len = Ustrlen(process_info);
1453 int error_rc = (error_handling == ERRORS_SENDER)?
1454 errors_sender_rc : EXIT_FAILURE;
1455 int header_size = 256;
1456 int start, end, domain, size, sptr;
1457 int id_resolution;
1458 int had_zero = 0;
1459 int prevlines_length = 0;
1460
1461 register int ptr = 0;
1462
1463 BOOL contains_resent_headers = FALSE;
1464 BOOL extracted_ignored = FALSE;
1465 BOOL first_line_ended_crlf = TRUE_UNSET;
1466 BOOL smtp_yield = TRUE;
1467 BOOL yield = FALSE;
1468
1469 BOOL resents_exist = FALSE;
1470 uschar *resent_prefix = US"";
1471 uschar *blackholed_by = NULL;
1472 uschar *blackhole_log_msg = US"";
1473 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1474
1475 flock_t lock_data;
1476 error_block *bad_addresses = NULL;
1477
1478 uschar *frozen_by = NULL;
1479 uschar *queued_by = NULL;
1480
1481 uschar *errmsg, *s;
1482 struct stat statbuf;
1483
1484 /* Final message to give to SMTP caller, and messages from ACLs */
1485
1486 uschar *smtp_reply = NULL;
1487 uschar *user_msg, *log_msg;
1488
1489 /* Working header pointers */
1490
1491 header_line *h, *next;
1492
1493 /* Flags for noting the existence of certain headers (only one left) */
1494
1495 BOOL date_header_exists = FALSE;
1496
1497 /* Pointers to receive the addresses of headers whose contents we need. */
1498
1499 header_line *from_header = NULL;
1500 header_line *subject_header = NULL;
1501 header_line *msgid_header = NULL;
1502 header_line *received_header;
1503
1504 #ifdef EXPERIMENTAL_DMARC
1505 int dmarc_up = 0;
1506 #endif /* EXPERIMENTAL_DMARC */
1507
1508 /* Variables for use when building the Received: header. */
1509
1510 uschar *timestamp;
1511 int tslen;
1512
1513 /* Release any open files that might have been cached while preparing to
1514 accept the message - e.g. by verifying addresses - because reading a message
1515 might take a fair bit of real time. */
1516
1517 search_tidyup();
1518
1519 /* Extracting the recipient list from an input file is incompatible with
1520 cutthrough delivery with the no-spool option. It shouldn't be possible
1521 to set up the combination, but just in case kill any ongoing connection. */
1522 if (extract_recip || !smtp_input)
1523 cancel_cutthrough_connection("not smtp input");
1524
1525 /* Initialize the chain of headers by setting up a place-holder for Received:
1526 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1527 pointing to the end of the chain to make adding headers simple. */
1528
1529 received_header = header_list = header_last = store_get(sizeof(header_line));
1530 header_list->next = NULL;
1531 header_list->type = htype_old;
1532 header_list->text = NULL;
1533 header_list->slen = 0;
1534
1535 /* Control block for the next header to be read. */
1536
1537 next = store_get(sizeof(header_line));
1538 next->text = store_get(header_size);
1539
1540 /* Initialize message id to be null (indicating no message read), and the
1541 header names list to be the normal list. Indicate there is no data file open
1542 yet, initialize the size and warning count, and deal with no size limit. */
1543
1544 message_id[0] = 0;
1545 data_file = NULL;
1546 data_fd = -1;
1547 spool_name = US"";
1548 message_size = 0;
1549 warning_count = 0;
1550 received_count = 1; /* For the one we will add */
1551
1552 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1553
1554 /* While reading the message, the following counts are computed. */
1555
1556 message_linecount = body_linecount = body_zerocount =
1557 max_received_linelength = 0;
1558
1559 #ifndef DISABLE_DKIM
1560 /* Call into DKIM to set up the context. */
1561 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1562 #endif
1563
1564 #ifdef EXPERIMENTAL_DMARC
1565 /* initialize libopendmarc */
1566 dmarc_up = dmarc_init();
1567 #endif
1568
1569 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1570 ids, and fractions of a second are required. See the comments that precede the
1571 message id creation below. */
1572
1573 (void)gettimeofday(&message_id_tv, NULL);
1574
1575 /* For other uses of the received time we can operate with granularity of one
1576 second, and for that we use the global variable received_time. This is for
1577 things like ultimate message timeouts. */
1578
1579 received_time = message_id_tv.tv_sec;
1580
1581 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1582 happen in the smtp_getc() function when it refills its buffer. */
1583
1584 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1585
1586 /* If not SMTP input, timeout happens only if configured, and we just set a
1587 single timeout for the whole message. */
1588
1589 else if (receive_timeout > 0)
1590 {
1591 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1592 alarm(receive_timeout);
1593 }
1594
1595 /* SIGTERM and SIGINT are caught always. */
1596
1597 signal(SIGTERM, data_sigterm_sigint_handler);
1598 signal(SIGINT, data_sigterm_sigint_handler);
1599
1600 /* Header lines in messages are not supposed to be very long, though when
1601 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1602 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1603 storing the header, and extend this as necessary using string_cat().
1604
1605 To cope with total lunacies, impose an upper limit on the length of the header
1606 section of the message, as otherwise the store will fill up. We must also cope
1607 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1608 Folded header lines are joined into one string, leaving the '\n' characters
1609 inside them, so that writing them out reproduces the input.
1610
1611 Loop for each character of each header; the next structure for chaining the
1612 header is set up already, with ptr the offset of the next character in
1613 next->text. */
1614
1615 for (;;)
1616 {
1617 int ch = (receive_getc)();
1618
1619 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1620 SMTP must have a correct "." terminator. */
1621
1622 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1623 {
1624 smtp_reply = handle_lost_connection(US" (header)");
1625 smtp_yield = FALSE;
1626 goto TIDYUP; /* Skip to end of function */
1627 }
1628
1629 /* See if we are at the current header's size limit - there must be at least
1630 four bytes left. This allows for the new character plus a zero, plus two for
1631 extra insertions when we are playing games with dots and carriage returns. If
1632 we are at the limit, extend the text buffer. This could have been done
1633 automatically using string_cat() but because this is a tightish loop storing
1634 only one character at a time, we choose to do it inline. Normally
1635 store_extend() will be able to extend the block; only at the end of a big
1636 store block will a copy be needed. To handle the case of very long headers
1637 (and sometimes lunatic messages can have ones that are 100s of K long) we
1638 call store_release() for strings that have been copied - if the string is at
1639 the start of a block (and therefore the only thing in it, because we aren't
1640 doing any other gets), the block gets freed. We can only do this because we
1641 know there are no other calls to store_get() going on. */
1642
1643 if (ptr >= header_size - 4)
1644 {
1645 int oldsize = header_size;
1646 /* header_size += 256; */
1647 header_size *= 2;
1648 if (!store_extend(next->text, oldsize, header_size))
1649 {
1650 uschar *newtext = store_get(header_size);
1651 memcpy(newtext, next->text, ptr);
1652 store_release(next->text);
1653 next->text = newtext;
1654 }
1655 }
1656
1657 /* Cope with receiving a binary zero. There is dispute about whether
1658 these should be allowed in RFC 822 messages. The middle view is that they
1659 should not be allowed in headers, at least. Exim takes this attitude at
1660 the moment. We can't just stomp on them here, because we don't know that
1661 this line is a header yet. Set a flag to cause scanning later. */
1662
1663 if (ch == 0) had_zero++;
1664
1665 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1666 those from data files use just LF. Treat LF in local SMTP input as a
1667 terminator too. Treat EOF as a line terminator always. */
1668
1669 if (ch == EOF) goto EOL;
1670
1671 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1672 other MTAs accept this. We are therefore forced into this "liberalisation"
1673 too, so we accept LF as a line terminator whatever the source of the message.
1674 However, if the first line of the message ended with a CRLF, we treat a bare
1675 LF specially by inserting a white space after it to ensure that the header
1676 line is not terminated. */
1677
1678 if (ch == '\n')
1679 {
1680 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1681 else if (first_line_ended_crlf) receive_ungetc(' ');
1682 goto EOL;
1683 }
1684
1685 /* This is not the end of the line. If this is SMTP input and this is
1686 the first character in the line and it is a "." character, ignore it.
1687 This implements the dot-doubling rule, though header lines starting with
1688 dots aren't exactly common. They are legal in RFC 822, though. If the
1689 following is CRLF or LF, this is the line that that terminates the
1690 entire message. We set message_ended to indicate this has happened (to
1691 prevent further reading), and break out of the loop, having freed the
1692 empty header, and set next = NULL to indicate no data line. */
1693
1694 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1695 {
1696 ch = (receive_getc)();
1697 if (ch == '\r')
1698 {
1699 ch = (receive_getc)();
1700 if (ch != '\n')
1701 {
1702 receive_ungetc(ch);
1703 ch = '\r'; /* Revert to CR */
1704 }
1705 }
1706 if (ch == '\n')
1707 {
1708 message_ended = END_DOT;
1709 store_reset(next);
1710 next = NULL;
1711 break; /* End character-reading loop */
1712 }
1713
1714 /* For non-SMTP input, the dot at the start of the line was really a data
1715 character. What is now in ch is the following character. We guaranteed
1716 enough space for this above. */
1717
1718 if (!smtp_input)
1719 {
1720 next->text[ptr++] = '.';
1721 message_size++;
1722 }
1723 }
1724
1725 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1726 remember this case if this is the first line ending. */
1727
1728 if (ch == '\r')
1729 {
1730 ch = (receive_getc)();
1731 if (ch == '\n')
1732 {
1733 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1734 goto EOL;
1735 }
1736
1737 /* Otherwise, put back the character after CR, and turn the bare CR
1738 into LF SP. */
1739
1740 ch = (receive_ungetc)(ch);
1741 next->text[ptr++] = '\n';
1742 message_size++;
1743 ch = ' ';
1744 }
1745
1746 /* We have a data character for the header line. */
1747
1748 next->text[ptr++] = ch; /* Add to buffer */
1749 message_size++; /* Total message size so far */
1750
1751 /* Handle failure due to a humungously long header section. The >= allows
1752 for the terminating \n. Add what we have so far onto the headers list so
1753 that it gets reflected in any error message, and back up the just-read
1754 character. */
1755
1756 if (message_size >= header_maxsize)
1757 {
1758 next->text[ptr] = 0;
1759 next->slen = ptr;
1760 next->type = htype_other;
1761 next->next = NULL;
1762 header_last->next = next;
1763 header_last = next;
1764
1765 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1766 "%s (more than %d characters): message abandoned",
1767 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1768
1769 if (smtp_input)
1770 {
1771 smtp_reply = US"552 Message header is ridiculously long";
1772 receive_swallow_smtp();
1773 goto TIDYUP; /* Skip to end of function */
1774 }
1775
1776 else
1777 {
1778 give_local_error(ERRMESS_VLONGHEADER,
1779 string_sprintf("message header longer than %d characters received: "
1780 "message not accepted", header_maxsize), US"", error_rc, stdin,
1781 header_list->next);
1782 /* Does not return */
1783 }
1784 }
1785
1786 continue; /* With next input character */
1787
1788 /* End of header line reached */
1789
1790 EOL:
1791
1792 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1793
1794 receive_linecount++;
1795 message_linecount++;
1796
1797 /* Keep track of maximum line length */
1798
1799 if (ptr - prevlines_length > max_received_linelength)
1800 max_received_linelength = ptr - prevlines_length;
1801 prevlines_length = ptr + 1;
1802
1803 /* Now put in the terminating newline. There is always space for
1804 at least two more characters. */
1805
1806 next->text[ptr++] = '\n';
1807 message_size++;
1808
1809 /* A blank line signals the end of the headers; release the unwanted
1810 space and set next to NULL to indicate this. */
1811
1812 if (ptr == 1)
1813 {
1814 store_reset(next);
1815 next = NULL;
1816 break;
1817 }
1818
1819 /* There is data in the line; see if the next input character is a
1820 whitespace character. If it is, we have a continuation of this header line.
1821 There is always space for at least one character at this point. */
1822
1823 if (ch != EOF)
1824 {
1825 int nextch = (receive_getc)();
1826 if (nextch == ' ' || nextch == '\t')
1827 {
1828 next->text[ptr++] = nextch;
1829 message_size++;
1830 continue; /* Iterate the loop */
1831 }
1832 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1833 else ch = EOF; /* Cause main loop to exit at end */
1834 }
1835
1836 /* We have got to the real line end. Terminate the string and release store
1837 beyond it. If it turns out to be a real header, internal binary zeros will
1838 be squashed later. */
1839
1840 next->text[ptr] = 0;
1841 next->slen = ptr;
1842 store_reset(next->text + ptr + 1);
1843
1844 /* Check the running total size against the overall message size limit. We
1845 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1846 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1847 headers - the code to read the body will then also hit the buffer. */
1848
1849 if (message_size > thismessage_size_limit) break;
1850
1851 /* A line that is not syntactically correct for a header also marks
1852 the end of the headers. In this case, we leave next containing the
1853 first data line. This might actually be several lines because of the
1854 continuation logic applied above, but that doesn't matter.
1855
1856 It turns out that smail, and presumably sendmail, accept leading lines
1857 of the form
1858
1859 From ph10 Fri Jan 5 12:35 GMT 1996
1860
1861 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1862 find any documentation of this, but for compatibility it had better be
1863 accepted. Exim restricts it to the case of non-smtp messages, and
1864 treats it as an alternative to the -f command line option. Thus it is
1865 ignored except for trusted users or filter testing. Otherwise it is taken
1866 as the sender address, unless -f was used (sendmail compatibility).
1867
1868 It further turns out that some UUCPs generate the From_line in a different
1869 format, e.g.
1870
1871 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1872
1873 The regex for matching these things is now capable of recognizing both
1874 formats (including 2- and 4-digit years in the latter). In fact, the regex
1875 is now configurable, as is the expansion string to fish out the sender.
1876
1877 Even further on it has been discovered that some broken clients send
1878 these lines in SMTP messages. There is now an option to ignore them from
1879 specified hosts or networks. Sigh. */
1880
1881 if (header_last == header_list &&
1882 (!smtp_input
1883 ||
1884 (sender_host_address != NULL &&
1885 verify_check_host(&ignore_fromline_hosts) == OK)
1886 ||
1887 (sender_host_address == NULL && ignore_fromline_local)
1888 ) &&
1889 regex_match_and_setup(regex_From, next->text, 0, -1))
1890 {
1891 if (!sender_address_forced)
1892 {
1893 uschar *uucp_sender = expand_string(uucp_from_sender);
1894 if (uucp_sender == NULL)
1895 {
1896 log_write(0, LOG_MAIN|LOG_PANIC,
1897 "expansion of \"%s\" failed after matching "
1898 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1899 }
1900 else
1901 {
1902 int start, end, domain;
1903 uschar *errmess;
1904 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1905 &start, &end, &domain, TRUE);
1906 if (newsender != NULL)
1907 {
1908 if (domain == 0 && newsender[0] != 0)
1909 newsender = rewrite_address_qualify(newsender, FALSE);
1910
1911 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1912 {
1913 sender_address = newsender;
1914
1915 if (trusted_caller || filter_test != FTEST_NONE)
1916 {
1917 authenticated_sender = NULL;
1918 originator_name = US"";
1919 sender_local = FALSE;
1920 }
1921
1922 if (filter_test != FTEST_NONE)
1923 printf("Sender taken from \"From \" line\n");
1924 }
1925 }
1926 }
1927 }
1928 }
1929
1930 /* Not a leading "From " line. Check to see if it is a valid header line.
1931 Header names may contain any non-control characters except space and colon,
1932 amazingly. */
1933
1934 else
1935 {
1936 uschar *p = next->text;
1937
1938 /* If not a valid header line, break from the header reading loop, leaving
1939 next != NULL, indicating that it holds the first line of the body. */
1940
1941 if (isspace(*p)) break;
1942 while (mac_isgraph(*p) && *p != ':') p++;
1943 while (isspace(*p)) p++;
1944 if (*p != ':')
1945 {
1946 body_zerocount = had_zero;
1947 break;
1948 }
1949
1950 /* We have a valid header line. If there were any binary zeroes in
1951 the line, stomp on them here. */
1952
1953 if (had_zero > 0)
1954 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1955
1956 /* It is perfectly legal to have an empty continuation line
1957 at the end of a header, but it is confusing to humans
1958 looking at such messages, since it looks like a blank line.
1959 Reduce confusion by removing redundant white space at the
1960 end. We know that there is at least one printing character
1961 (the ':' tested for above) so there is no danger of running
1962 off the end. */
1963
1964 p = next->text + ptr - 2;
1965 for (;;)
1966 {
1967 while (*p == ' ' || *p == '\t') p--;
1968 if (*p != '\n') break;
1969 ptr = (p--) - next->text + 1;
1970 message_size -= next->slen - ptr;
1971 next->text[ptr] = 0;
1972 next->slen = ptr;
1973 }
1974
1975 /* Add the header to the chain */
1976
1977 next->type = htype_other;
1978 next->next = NULL;
1979 header_last->next = next;
1980 header_last = next;
1981
1982 /* Check the limit for individual line lengths. This comes after adding to
1983 the chain so that the failing line is reflected if a bounce is generated
1984 (for a local message). */
1985
1986 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1987 {
1988 log_write(0, LOG_MAIN, "overlong message header line received from "
1989 "%s (more than %d characters): message abandoned",
1990 sender_host_unknown? sender_ident : sender_fullhost,
1991 header_line_maxsize);
1992
1993 if (smtp_input)
1994 {
1995 smtp_reply = US"552 A message header line is too long";
1996 receive_swallow_smtp();
1997 goto TIDYUP; /* Skip to end of function */
1998 }
1999
2000 else
2001 {
2002 give_local_error(ERRMESS_VLONGHDRLINE,
2003 string_sprintf("message header line longer than %d characters "
2004 "received: message not accepted", header_line_maxsize), US"",
2005 error_rc, stdin, header_list->next);
2006 /* Does not return */
2007 }
2008 }
2009
2010 /* Note if any resent- fields exist. */
2011
2012 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2013 {
2014 resents_exist = TRUE;
2015 resent_prefix = US"Resent-";
2016 }
2017 }
2018
2019 /* The line has been handled. If we have hit EOF, break out of the loop,
2020 indicating no pending data line. */
2021
2022 if (ch == EOF) { next = NULL; break; }
2023
2024 /* Set up for the next header */
2025
2026 header_size = 256;
2027 next = store_get(sizeof(header_line));
2028 next->text = store_get(header_size);
2029 ptr = 0;
2030 had_zero = 0;
2031 prevlines_length = 0;
2032 } /* Continue, starting to read the next header */
2033
2034 /* At this point, we have read all the headers into a data structure in main
2035 store. The first header is still the dummy placeholder for the Received: header
2036 we are going to generate a bit later on. If next != NULL, it contains the first
2037 data line - which terminated the headers before reaching a blank line (not the
2038 normal case). */
2039
2040 DEBUG(D_receive)
2041 {
2042 debug_printf(">>Headers received:\n");
2043 for (h = header_list->next; h != NULL; h = h->next)
2044 debug_printf("%s", h->text);
2045 debug_printf("\n");
2046 }
2047
2048 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2049 is dropped immediately after valid headers, the next thing we will see is EOF.
2050 We must test for this specially, as further down the reading of the data is
2051 skipped if already at EOF. */
2052
2053 if (smtp_input && (receive_feof)())
2054 {
2055 smtp_reply = handle_lost_connection(US" (after header)");
2056 smtp_yield = FALSE;
2057 goto TIDYUP; /* Skip to end of function */
2058 }
2059
2060 /* If this is a filter test run and no headers were read, output a warning
2061 in case there is a mistake in the test message. */
2062
2063 if (filter_test != FTEST_NONE && header_list->next == NULL)
2064 printf("Warning: no message headers read\n");
2065
2066
2067 /* Scan the headers to identify them. Some are merely marked for later
2068 processing; some are dealt with here. */
2069
2070 for (h = header_list->next; h != NULL; h = h->next)
2071 {
2072 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2073 if (is_resent) contains_resent_headers = TRUE;
2074
2075 switch (header_checkname(h, is_resent))
2076 {
2077 case htype_bcc:
2078 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2079 break;
2080
2081 case htype_cc:
2082 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2083 break;
2084
2085 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2086
2087 case htype_date:
2088 if (!resents_exist || is_resent) date_header_exists = TRUE;
2089 break;
2090
2091 /* Same comments as about Return-Path: below. */
2092
2093 case htype_delivery_date:
2094 if (delivery_date_remove) h->type = htype_old;
2095 break;
2096
2097 /* Same comments as about Return-Path: below. */
2098
2099 case htype_envelope_to:
2100 if (envelope_to_remove) h->type = htype_old;
2101 break;
2102
2103 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2104 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2105 header consists of just the login id of the user who called Exim, rewrite
2106 it with the gecos field first. Apply this rule to Resent-From: if there
2107 are resent- fields. */
2108
2109 case htype_from:
2110 h->type = htype_from;
2111 if (!resents_exist || is_resent)
2112 {
2113 from_header = h;
2114 if (!smtp_input)
2115 {
2116 int len;
2117 uschar *s = Ustrchr(h->text, ':') + 1;
2118 while (isspace(*s)) s++;
2119 len = h->slen - (s - h->text) - 1;
2120 if (Ustrlen(originator_login) == len &&
2121 strncmpic(s, originator_login, len) == 0)
2122 {
2123 uschar *name = is_resent? US"Resent-From" : US"From";
2124 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2125 originator_login, qualify_domain_sender);
2126 from_header = header_last;
2127 h->type = htype_old;
2128 DEBUG(D_receive|D_rewrite)
2129 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2130 }
2131 }
2132 }
2133 break;
2134
2135 /* Identify the Message-id: header for generating "in-reply-to" in the
2136 autoreply transport. For incoming logging, save any resent- value. In both
2137 cases, take just the first of any multiples. */
2138
2139 case htype_id:
2140 if (msgid_header == NULL && (!resents_exist || is_resent))
2141 {
2142 msgid_header = h;
2143 h->type = htype_id;
2144 }
2145 break;
2146
2147 /* Flag all Received: headers */
2148
2149 case htype_received:
2150 h->type = htype_received;
2151 received_count++;
2152 break;
2153
2154 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2155
2156 case htype_reply_to:
2157 h->type = htype_reply_to;
2158 break;
2159
2160 /* The Return-path: header is supposed to be added to messages when
2161 they leave the SMTP system. We shouldn't receive messages that already
2162 contain Return-path. However, since Exim generates Return-path: on
2163 local delivery, resent messages may well contain it. We therefore
2164 provide an option (which defaults on) to remove any Return-path: headers
2165 on input. Removal actually means flagging as "old", which prevents the
2166 header being transmitted with the message. */
2167
2168 case htype_return_path:
2169 if (return_path_remove) h->type = htype_old;
2170
2171 /* If we are testing a mail filter file, use the value of the
2172 Return-Path: header to set up the return_path variable, which is not
2173 otherwise set. However, remove any <> that surround the address
2174 because the variable doesn't have these. */
2175
2176 if (filter_test != FTEST_NONE)
2177 {
2178 uschar *start = h->text + 12;
2179 uschar *end = start + Ustrlen(start);
2180 while (isspace(*start)) start++;
2181 while (end > start && isspace(end[-1])) end--;
2182 if (*start == '<' && end[-1] == '>')
2183 {
2184 start++;
2185 end--;
2186 }
2187 return_path = string_copyn(start, end - start);
2188 printf("Return-path taken from \"Return-path:\" header line\n");
2189 }
2190 break;
2191
2192 /* If there is a "Sender:" header and the message is locally originated,
2193 and from an untrusted caller and suppress_local_fixups is not set, or if we
2194 are in submission mode for a remote message, mark it "old" so that it will
2195 not be transmitted with the message, unless active_local_sender_retain is
2196 set. (This can only be true if active_local_from_check is false.) If there
2197 are any resent- headers in the message, apply this rule to Resent-Sender:
2198 instead of Sender:. Messages with multiple resent- header sets cannot be
2199 tidily handled. (For this reason, at least one MUA - Pine - turns old
2200 resent- headers into X-resent- headers when resending, leaving just one
2201 set.) */
2202
2203 case htype_sender:
2204 h->type = ((!active_local_sender_retain &&
2205 (
2206 (sender_local && !trusted_caller && !suppress_local_fixups)
2207 || submission_mode
2208 )
2209 ) &&
2210 (!resents_exist||is_resent))?
2211 htype_old : htype_sender;
2212 break;
2213
2214 /* Remember the Subject: header for logging. There is no Resent-Subject */
2215
2216 case htype_subject:
2217 subject_header = h;
2218 break;
2219
2220 /* "To:" gets flagged, and the existence of a recipient header is noted,
2221 whether it's resent- or not. */
2222
2223 case htype_to:
2224 h->type = htype_to;
2225 /****
2226 to_or_cc_header_exists = TRUE;
2227 ****/
2228 break;
2229 }
2230 }
2231
2232 /* Extract recipients from the headers if that is required (the -t option).
2233 Note that this is documented as being done *before* any address rewriting takes
2234 place. There are two possibilities:
2235
2236 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2237 recipients already listed are to be REMOVED from the message. Smail 3 works
2238 like this. We need to build a non-recipients tree for that list, because in
2239 subsequent processing this data is held in a tree and that's what the
2240 spool_write_header() function expects. Make sure that non-recipient addresses
2241 are fully qualified and rewritten if necessary.
2242
2243 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2244 those in the command line arguments (and it is rumoured some other MTAs do
2245 this). Therefore, there is an option to make Exim behave this way.
2246
2247 *** Notes on "Resent-" header lines ***
2248
2249 The presence of resent-headers in the message makes -t horribly ambiguous.
2250 Experiments with sendmail showed that it uses recipients for all resent-
2251 headers, totally ignoring the concept of "sets of resent- headers" as described
2252 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2253 with all the addresses in one instance of each header.
2254
2255 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2256 error for -t if there were resent- headers in the message. However, after a
2257 discussion on the mailing list, I've learned that there are MUAs that use
2258 resent- headers with -t, and also that the stuff about sets of resent- headers
2259 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2260 message with -t and resent- header lines makes sure that only *its* resent-
2261 headers are present; previous ones are often renamed as X-resent- for example.
2262
2263 Consequently, Exim has been changed so that, if any resent- header lines are
2264 present, the recipients are taken from all of the appropriate resent- lines,
2265 and not from the ordinary To:, Cc:, etc. */
2266
2267 if (extract_recip)
2268 {
2269 int rcount = 0;
2270 error_block **bnext = &bad_addresses;
2271
2272 if (extract_addresses_remove_arguments)
2273 {
2274 while (recipients_count-- > 0)
2275 {
2276 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2277 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2278 tree_add_nonrecipient(s);
2279 }
2280 recipients_list = NULL;
2281 recipients_count = recipients_list_max = 0;
2282 }
2283
2284 /* Now scan the headers */
2285
2286 for (h = header_list->next; h != NULL; h = h->next)
2287 {
2288 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2289 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2290 {
2291 uschar *s = Ustrchr(h->text, ':') + 1;
2292 while (isspace(*s)) s++;
2293
2294 parse_allow_group = TRUE; /* Allow address group syntax */
2295
2296 while (*s != 0)
2297 {
2298 uschar *ss = parse_find_address_end(s, FALSE);
2299 uschar *recipient, *errmess, *p, *pp;
2300 int start, end, domain;
2301
2302 /* Check on maximum */
2303
2304 if (recipients_max > 0 && ++rcount > recipients_max)
2305 {
2306 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2307 US"message rejected: ", error_rc, stdin, NULL);
2308 /* Does not return */
2309 }
2310
2311 /* Make a copy of the address, and remove any internal newlines. These
2312 may be present as a result of continuations of the header line. The
2313 white space that follows the newline must not be removed - it is part
2314 of the header. */
2315
2316 pp = recipient = store_get(ss - s + 1);
2317 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2318 *pp = 0;
2319
2320 #ifdef SUPPORT_I18N
2321 {
2322 BOOL b = allow_utf8_domains;
2323 allow_utf8_domains = TRUE;
2324 #endif
2325 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2326 &domain, FALSE);
2327
2328 #ifdef SUPPORT_I18N
2329 if (string_is_utf8(recipient))
2330 message_smtputf8 = TRUE;
2331 else
2332 allow_utf8_domains = b;
2333 }
2334 #endif
2335
2336 /* Keep a list of all the bad addresses so we can send a single
2337 error message at the end. However, an empty address is not an error;
2338 just ignore it. This can come from an empty group list like
2339
2340 To: Recipients of list:;
2341
2342 If there are no recipients at all, an error will occur later. */
2343
2344 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2345 {
2346 int len = Ustrlen(s);
2347 error_block *b = store_get(sizeof(error_block));
2348 while (len > 0 && isspace(s[len-1])) len--;
2349 b->next = NULL;
2350 b->text1 = string_printing(string_copyn(s, len));
2351 b->text2 = errmess;
2352 *bnext = b;
2353 bnext = &(b->next);
2354 }
2355
2356 /* If the recipient is already in the nonrecipients tree, it must
2357 have appeared on the command line with the option extract_addresses_
2358 remove_arguments set. Do not add it to the recipients, and keep a note
2359 that this has happened, in order to give a better error if there are
2360 no recipients left. */
2361
2362 else if (recipient != NULL)
2363 {
2364 if (tree_search(tree_nonrecipients, recipient) == NULL)
2365 receive_add_recipient(recipient, -1);
2366 else
2367 extracted_ignored = TRUE;
2368 }
2369
2370 /* Move on past this address */
2371
2372 s = ss + (*ss? 1:0);
2373 while (isspace(*s)) s++;
2374 } /* Next address */
2375
2376 parse_allow_group = FALSE; /* Reset group syntax flags */
2377 parse_found_group = FALSE;
2378
2379 /* If this was the bcc: header, mark it "old", which means it
2380 will be kept on the spool, but not transmitted as part of the
2381 message. */
2382
2383 if (h->type == htype_bcc) h->type = htype_old;
2384 } /* For appropriate header line */
2385 } /* For each header line */
2386
2387 }
2388
2389 /* Now build the unique message id. This has changed several times over the
2390 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2391 Retaining all the history in the comment has become too unwieldy - read
2392 previous release sources if you want it.
2393
2394 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2395 The first part is the current time, in seconds. The second part is the current
2396 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2397 can hold a number in the range 0-3843. It used to be a computed sequence
2398 number, but is now the fractional component of the current time in units of
2399 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2400 received, Exim ensures that the timer has ticked at the appropriate level
2401 before proceeding, to avoid duplication if the pid happened to be re-used
2402 within the same time period. It seems likely that most messages will take at
2403 least half a millisecond to be received, so no delay will normally be
2404 necessary. At least for some time...
2405
2406 There is a modification when localhost_number is set. Formerly this was allowed
2407 to be as large as 255. Now it is restricted to the range 0-16, and the final
2408 component of the message id becomes (localhost_number * 200) + fractional time
2409 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2410
2411 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2412 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2413 still allows the tttttt field to hold a large enough number to last for some
2414 more decades, and the final two-digit field can hold numbers up to 1295, which
2415 is enough for milliseconds (instead of 1/2000 of a second).
2416
2417 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2418 pid, so it is probably safe because pids have to be positive. The
2419 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2420 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2421
2422 Note that string_base62() returns its data in a static storage block, so it
2423 must be copied before calling string_base62() again. It always returns exactly
2424 6 characters.
2425
2426 There doesn't seem to be anything in the RFC which requires a message id to
2427 start with a letter, but Smail was changed to ensure this. The external form of
2428 the message id (as supplied by string expansion) therefore starts with an
2429 additional leading 'E'. The spool file names do not include this leading
2430 letter and it is not used internally.
2431
2432 NOTE: If ever the format of message ids is changed, the regular expression for
2433 checking that a string is in this format must be updated in a corresponding
2434 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2435 must also be changed to reflect the correct string length. Then, of course,
2436 other programs that rely on the message id format will need updating too. */
2437
2438 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2439 message_id[6] = '-';
2440 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2441
2442 /* Deal with the case where the host number is set. The value of the number was
2443 checked when it was read, to ensure it isn't too big. The timing granularity is
2444 left in id_resolution so that an appropriate wait can be done after receiving
2445 the message, if necessary (we hope it won't be). */
2446
2447 if (host_number_string != NULL)
2448 {
2449 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2450 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2451 string_base62((long int)(
2452 host_number * (1000000/id_resolution) +
2453 message_id_tv.tv_usec/id_resolution)) + 4);
2454 }
2455
2456 /* Host number not set: final field is just the fractional time at an
2457 appropriate resolution. */
2458
2459 else
2460 {
2461 id_resolution = (BASE_62 == 62)? 500 : 1000;
2462 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2463 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2464 }
2465
2466 /* Add the current message id onto the current process info string if
2467 it will fit. */
2468
2469 (void)string_format(process_info + process_info_len,
2470 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2471
2472 /* If we are using multiple input directories, set up the one for this message
2473 to be the least significant base-62 digit of the time of arrival. Otherwise
2474 ensure that it is an empty string. */
2475
2476 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2477
2478 /* Now that we have the message-id, if there is no message-id: header, generate
2479 one, but only for local (without suppress_local_fixups) or submission mode
2480 messages. This can be user-configured if required, but we had better flatten
2481 any illegal characters therein. */
2482
2483 if (msgid_header == NULL &&
2484 ((sender_host_address == NULL && !suppress_local_fixups)
2485 || submission_mode))
2486 {
2487 uschar *p;
2488 uschar *id_text = US"";
2489 uschar *id_domain = primary_hostname;
2490
2491 /* Permit only letters, digits, dots, and hyphens in the domain */
2492
2493 if (message_id_domain != NULL)
2494 {
2495 uschar *new_id_domain = expand_string(message_id_domain);
2496 if (new_id_domain == NULL)
2497 {
2498 if (!expand_string_forcedfail)
2499 log_write(0, LOG_MAIN|LOG_PANIC,
2500 "expansion of \"%s\" (message_id_header_domain) "
2501 "failed: %s", message_id_domain, expand_string_message);
2502 }
2503 else if (*new_id_domain != 0)
2504 {
2505 id_domain = new_id_domain;
2506 for (p = id_domain; *p != 0; p++)
2507 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2508 }
2509 }
2510
2511 /* Permit all characters except controls and RFC 2822 specials in the
2512 additional text part. */
2513
2514 if (message_id_text != NULL)
2515 {
2516 uschar *new_id_text = expand_string(message_id_text);
2517 if (new_id_text == NULL)
2518 {
2519 if (!expand_string_forcedfail)
2520 log_write(0, LOG_MAIN|LOG_PANIC,
2521 "expansion of \"%s\" (message_id_header_text) "
2522 "failed: %s", message_id_text, expand_string_message);
2523 }
2524 else if (*new_id_text != 0)
2525 {
2526 id_text = new_id_text;
2527 for (p = id_text; *p != 0; p++)
2528 if (mac_iscntrl_or_special(*p)) *p = '-';
2529 }
2530 }
2531
2532 /* Add the header line
2533 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2534 * appended, to preserve classical expectations of header ordering. */
2535
2536 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2537 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2538 (*id_text == 0)? "" : ".", id_text, id_domain);
2539 }
2540
2541 /* If we are to log recipients, keep a copy of the raw ones before any possible
2542 rewriting. Must copy the count, because later ACLs and the local_scan()
2543 function may mess with the real recipients. */
2544
2545 if (LOGGING(received_recipients))
2546 {
2547 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2548 for (i = 0; i < recipients_count; i++)
2549 raw_recipients[i] = string_copy(recipients_list[i].address);
2550 raw_recipients_count = recipients_count;
2551 }
2552
2553 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2554 recipients will get here only if the conditions were right (allow_unqualified_
2555 recipient is TRUE). */
2556
2557 for (i = 0; i < recipients_count; i++)
2558 recipients_list[i].address =
2559 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2560 global_rewrite_rules, rewrite_existflags);
2561
2562 /* If there is no From: header, generate one for local (without
2563 suppress_local_fixups) or submission_mode messages. If there is no sender
2564 address, but the sender is local or this is a local delivery error, use the
2565 originator login. This shouldn't happen for genuine bounces, but might happen
2566 for autoreplies. The addition of From: must be done *before* checking for the
2567 possible addition of a Sender: header, because untrusted_set_sender allows an
2568 untrusted user to set anything in the envelope (which might then get info
2569 From:) but we still want to ensure a valid Sender: if it is required. */
2570
2571 if (from_header == NULL &&
2572 ((sender_host_address == NULL && !suppress_local_fixups)
2573 || submission_mode))
2574 {
2575 uschar *oname = US"";
2576
2577 /* Use the originator_name if this is a locally submitted message and the
2578 caller is not trusted. For trusted callers, use it only if -F was used to
2579 force its value or if we have a non-SMTP message for which -f was not used
2580 to set the sender. */
2581
2582 if (sender_host_address == NULL)
2583 {
2584 if (!trusted_caller || sender_name_forced ||
2585 (!smtp_input && !sender_address_forced))
2586 oname = originator_name;
2587 }
2588
2589 /* For non-locally submitted messages, the only time we use the originator
2590 name is when it was forced by the /name= option on control=submission. */
2591
2592 else
2593 {
2594 if (submission_name != NULL) oname = submission_name;
2595 }
2596
2597 /* Envelope sender is empty */
2598
2599 if (sender_address[0] == 0)
2600 {
2601 uschar *fromstart, *fromend;
2602
2603 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2604 oname, (oname[0] == 0)? "" : " <");
2605 fromend = (oname[0] == 0)? US"" : US">";
2606
2607 if (sender_local || local_error_message)
2608 {
2609 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2610 local_part_quote(originator_login), qualify_domain_sender,
2611 fromend);
2612 }
2613 else if (submission_mode && authenticated_id != NULL)
2614 {
2615 if (submission_domain == NULL)
2616 {
2617 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2618 local_part_quote(authenticated_id), qualify_domain_sender,
2619 fromend);
2620 }
2621 else if (submission_domain[0] == 0) /* empty => whole address set */
2622 {
2623 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2624 fromend);
2625 }
2626 else
2627 {
2628 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2629 local_part_quote(authenticated_id), submission_domain,
2630 fromend);
2631 }
2632 from_header = header_last; /* To get it checked for Sender: */
2633 }
2634 }
2635
2636 /* There is a non-null envelope sender. Build the header using the original
2637 sender address, before any rewriting that might have been done while
2638 verifying it. */
2639
2640 else
2641 {
2642 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2643 oname,
2644 (oname[0] == 0)? "" : " <",
2645 (sender_address_unrewritten == NULL)?
2646 sender_address : sender_address_unrewritten,
2647 (oname[0] == 0)? "" : ">");
2648
2649 from_header = header_last; /* To get it checked for Sender: */
2650 }
2651 }
2652
2653
2654 /* If the sender is local (without suppress_local_fixups), or if we are in
2655 submission mode and there is an authenticated_id, check that an existing From:
2656 is correct, and if not, generate a Sender: header, unless disabled. Any
2657 previously-existing Sender: header was removed above. Note that sender_local,
2658 as well as being TRUE if the caller of exim is not trusted, is also true if a
2659 trusted caller did not supply a -f argument for non-smtp input. To allow
2660 trusted callers to forge From: without supplying -f, we have to test explicitly
2661 here. If the From: header contains more than one address, then the call to
2662 parse_extract_address fails, and a Sender: header is inserted, as required. */
2663
2664 if (from_header != NULL &&
2665 (active_local_from_check &&
2666 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2667 (submission_mode && authenticated_id != NULL))
2668 ))
2669 {
2670 BOOL make_sender = TRUE;
2671 int start, end, domain;
2672 uschar *errmess;
2673 uschar *from_address =
2674 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2675 &start, &end, &domain, FALSE);
2676 uschar *generated_sender_address;
2677
2678 if (submission_mode)
2679 {
2680 if (submission_domain == NULL)
2681 {
2682 generated_sender_address = string_sprintf("%s@%s",
2683 local_part_quote(authenticated_id), qualify_domain_sender);
2684 }
2685 else if (submission_domain[0] == 0) /* empty => full address */
2686 {
2687 generated_sender_address = string_sprintf("%s",
2688 authenticated_id);
2689 }
2690 else
2691 {
2692 generated_sender_address = string_sprintf("%s@%s",
2693 local_part_quote(authenticated_id), submission_domain);
2694 }
2695 }
2696 else
2697 generated_sender_address = string_sprintf("%s@%s",
2698 local_part_quote(originator_login), qualify_domain_sender);
2699
2700 /* Remove permitted prefixes and suffixes from the local part of the From:
2701 address before doing the comparison with the generated sender. */
2702
2703 if (from_address != NULL)
2704 {
2705 int slen;
2706 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2707
2708 if (at != NULL) *at = 0;
2709 from_address += route_check_prefix(from_address, local_from_prefix);
2710 slen = route_check_suffix(from_address, local_from_suffix);
2711 if (slen > 0)
2712 {
2713 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2714 from_address += slen;
2715 }
2716 if (at != NULL) *at = '@';
2717
2718 if (strcmpic(generated_sender_address, from_address) == 0 ||
2719 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2720 make_sender = FALSE;
2721 }
2722
2723 /* We have to cause the Sender header to be rewritten if there are
2724 appropriate rewriting rules. */
2725
2726 if (make_sender)
2727 {
2728 if (submission_mode && submission_name == NULL)
2729 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2730 generated_sender_address);
2731 else
2732 header_add(htype_sender, "%sSender: %s <%s>\n",
2733 resent_prefix,
2734 submission_mode? submission_name : originator_name,
2735 generated_sender_address);
2736 }
2737
2738 /* Ensure that a non-null envelope sender address corresponds to the
2739 submission mode sender address. */
2740
2741 if (submission_mode && sender_address[0] != 0)
2742 {
2743 if (sender_address_unrewritten == NULL)
2744 sender_address_unrewritten = sender_address;
2745 sender_address = generated_sender_address;
2746 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2747 log_write(L_address_rewrite, LOG_MAIN,
2748 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2749 sender_address_unrewritten, generated_sender_address);
2750 }
2751 }
2752
2753 /* If there are any rewriting rules, apply them to the sender address, unless
2754 it has already been rewritten as part of verification for SMTP input. */
2755
2756 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2757 sender_address[0] != 0)
2758 {
2759 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2760 global_rewrite_rules, rewrite_existflags);
2761 DEBUG(D_receive|D_rewrite)
2762 debug_printf("rewritten sender = %s\n", sender_address);
2763 }
2764
2765
2766 /* The headers must be run through rewrite_header(), because it ensures that
2767 addresses are fully qualified, as well as applying any rewriting rules that may
2768 exist.
2769
2770 Qualification of header addresses in a message from a remote host happens only
2771 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2772 appropriate. For local messages, qualification always happens, unless -bnq is
2773 used to explicitly suppress it. No rewriting is done for an unqualified address
2774 that is left untouched.
2775
2776 We start at the second header, skipping our own Received:. This rewriting is
2777 documented as happening *after* recipient addresses are taken from the headers
2778 by the -t command line option. An added Sender: gets rewritten here. */
2779
2780 for (h = header_list->next; h != NULL; h = h->next)
2781 {
2782 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2783 rewrite_existflags, TRUE);
2784 if (newh != NULL) h = newh;
2785 }
2786
2787
2788 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2789 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2790 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2791 exists, this applies to the set of resent- headers rather than the normal set.
2792
2793 The requirement for a recipient header has been removed in RFC 2822. At this
2794 point in the code, earlier versions of Exim added a To: header for locally
2795 submitted messages, and an empty Bcc: header for others. In the light of the
2796 changes in RFC 2822, this was dropped in November 2003. */
2797
2798
2799 /* If there is no date header, generate one if the message originates locally
2800 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2801 submission mode flag is set. Messages without Date: are not valid, but it seems
2802 to be more confusing if Exim adds one to all remotely-originated messages.
2803 As per Message-Id, we prepend if resending, else append.
2804 */
2805
2806 if (!date_header_exists &&
2807 ((sender_host_address == NULL && !suppress_local_fixups)
2808 || submission_mode))
2809 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2810 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2811
2812 search_tidyup(); /* Free any cached resources */
2813
2814 /* Show the complete set of headers if debugging. Note that the first one (the
2815 new Received:) has not yet been set. */
2816
2817 DEBUG(D_receive)
2818 {
2819 debug_printf(">>Headers after rewriting and local additions:\n");
2820 for (h = header_list->next; h != NULL; h = h->next)
2821 debug_printf("%c %s", h->type, h->text);
2822 debug_printf("\n");
2823 }
2824
2825 /* The headers are now complete in store. If we are running in filter
2826 testing mode, that is all this function does. Return TRUE if the message
2827 ended with a dot. */
2828
2829 if (filter_test != FTEST_NONE)
2830 {
2831 process_info[process_info_len] = 0;
2832 return message_ended == END_DOT;
2833 }
2834
2835 /* Cutthrough delivery:
2836 We have to create the Received header now rather than at the end of reception,
2837 so the timestamp behaviour is a change to the normal case.
2838 XXX Ensure this gets documented XXX.
2839 Having created it, send the headers to the destination. */
2840 if (cutthrough.fd >= 0)
2841 {
2842 if (received_count > received_headers_max)
2843 {
2844 cancel_cutthrough_connection("too many headers");
2845 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2846 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2847 "Too many \"Received\" headers",
2848 sender_address,
2849 (sender_fullhost == NULL)? "" : " H=",
2850 (sender_fullhost == NULL)? US"" : sender_fullhost,
2851 (sender_ident == NULL)? "" : " U=",
2852 (sender_ident == NULL)? US"" : sender_ident);
2853 message_id[0] = 0; /* Indicate no message accepted */
2854 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2855 goto TIDYUP; /* Skip to end of function */
2856 }
2857 received_header_gen();
2858 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2859 (void) cutthrough_headers_send();
2860 }
2861
2862
2863 /* Open a new spool file for the data portion of the message. We need
2864 to access it both via a file descriptor and a stream. Try to make the
2865 directory if it isn't there. */
2866
2867 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
2868 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
2869
2870 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
2871 {
2872 if (errno == ENOENT)
2873 {
2874 (void) directory_make(spool_directory,
2875 spool_sname(US"input", message_subdir),
2876 INPUT_DIRECTORY_MODE, TRUE);
2877 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2878 }
2879 if (data_fd < 0)
2880 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2881 spool_name, strerror(errno));
2882 }
2883
2884 /* Make sure the file's group is the Exim gid, and double-check the mode
2885 because the group setting doesn't always get set automatically. */
2886
2887 if (fchown(data_fd, exim_uid, exim_gid))
2888 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2889 "Failed setting ownership on spool file %s: %s",
2890 spool_name, strerror(errno));
2891 (void)fchmod(data_fd, SPOOL_MODE);
2892
2893 /* We now have data file open. Build a stream for it and lock it. We lock only
2894 the first line of the file (containing the message ID) because otherwise there
2895 are problems when Exim is run under Cygwin (I'm told). See comments in
2896 spool_in.c, where the same locking is done. */
2897
2898 data_file = fdopen(data_fd, "w+");
2899 lock_data.l_type = F_WRLCK;
2900 lock_data.l_whence = SEEK_SET;
2901 lock_data.l_start = 0;
2902 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2903
2904 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2905 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2906 errno, strerror(errno));
2907
2908 /* We have an open, locked data file. Write the message id to it to make it
2909 self-identifying. Then read the remainder of the input of this message and
2910 write it to the data file. If the variable next != NULL, it contains the first
2911 data line (which was read as a header but then turned out not to have the right
2912 format); write it (remembering that it might contain binary zeros). The result
2913 of fwrite() isn't inspected; instead we call ferror() below. */
2914
2915 fprintf(data_file, "%s-D\n", message_id);
2916 if (next != NULL)
2917 {
2918 uschar *s = next->text;
2919 int len = next->slen;
2920 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2921 body_linecount++; /* Assumes only 1 line */
2922 }
2923
2924 /* Note that we might already be at end of file, or the logical end of file
2925 (indicated by '.'), or might have encountered an error while writing the
2926 message id or "next" line. */
2927
2928 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2929 {
2930 if (smtp_input)
2931 {
2932 message_ended = read_message_data_smtp(data_file);
2933 receive_linecount++; /* The terminating "." line */
2934 }
2935 else message_ended = read_message_data(data_file);
2936
2937 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2938 message_linecount += body_linecount;
2939
2940 /* Handle premature termination of SMTP */
2941
2942 if (smtp_input && message_ended == END_EOF)
2943 {
2944 Uunlink(spool_name); /* Lose data file when closed */
2945 cancel_cutthrough_connection("sender closed connection");
2946 message_id[0] = 0; /* Indicate no message accepted */
2947 smtp_reply = handle_lost_connection(US"");
2948 smtp_yield = FALSE;
2949 goto TIDYUP; /* Skip to end of function */
2950 }
2951
2952 /* Handle message that is too big. Don't use host_or_ident() in the log
2953 message; we want to see the ident value even for non-remote messages. */
2954
2955 if (message_ended == END_SIZE)
2956 {
2957 Uunlink(spool_name); /* Lose the data file when closed */
2958 cancel_cutthrough_connection("mail too big");
2959 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2960
2961 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2962 "message too big: read=%d max=%d",
2963 sender_address,
2964 (sender_fullhost == NULL)? "" : " H=",
2965 (sender_fullhost == NULL)? US"" : sender_fullhost,
2966 (sender_ident == NULL)? "" : " U=",
2967 (sender_ident == NULL)? US"" : sender_ident,
2968 message_size,
2969 thismessage_size_limit);
2970
2971 if (smtp_input)
2972 {
2973 smtp_reply = US"552 Message size exceeds maximum permitted";
2974 message_id[0] = 0; /* Indicate no message accepted */
2975 goto TIDYUP; /* Skip to end of function */
2976 }
2977 else
2978 {
2979 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2980 give_local_error(ERRMESS_TOOBIG,
2981 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2982 US"message rejected: ", error_rc, data_file, header_list);
2983 /* Does not return */
2984 }
2985 }
2986 }
2987
2988 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2989 example, there may be some expansion in an ACL that uses a timer.) */
2990
2991 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2992
2993 /* The message body has now been read into the data file. Call fflush() to
2994 empty the buffers in C, and then call fsync() to get the data written out onto
2995 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2996 having to do this). If there was an I/O error on either input or output,
2997 attempt to send an error message, and unlink the spool file. For non-SMTP input
2998 we can then give up. Note that for SMTP input we must swallow the remainder of
2999 the input in cases of output errors, since the far end doesn't expect to see
3000 anything until the terminating dot line is sent. */
3001
3002 if (fflush(data_file) == EOF || ferror(data_file) ||
3003 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3004 {
3005 uschar *msg_errno = US strerror(errno);
3006 BOOL input_error = (receive_ferror)() != 0;
3007 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3008 input_error? "Input read" : "Spool write",
3009 msg_errno,
3010 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3011
3012 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3013 Uunlink(spool_name); /* Lose the data file */
3014 cancel_cutthrough_connection("error writing spoolfile");
3015
3016 if (smtp_input)
3017 {
3018 if (input_error)
3019 smtp_reply = US"451 Error while reading input data";
3020 else
3021 {
3022 smtp_reply = US"451 Error while writing spool file";
3023 receive_swallow_smtp();
3024 }
3025 message_id[0] = 0; /* Indicate no message accepted */
3026 goto TIDYUP; /* Skip to end of function */
3027 }
3028
3029 else
3030 {
3031 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3032 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3033 header_list);
3034 /* Does not return */
3035 }
3036 }
3037
3038
3039 /* No I/O errors were encountered while writing the data file. */
3040
3041 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3042
3043
3044 /* If there were any bad addresses extracted by -t, or there were no recipients
3045 left after -t, send a message to the sender of this message, or write it to
3046 stderr if the error handling option is set that way. Note that there may
3047 legitimately be no recipients for an SMTP message if they have all been removed
3048 by "discard".
3049
3050 We need to rewind the data file in order to read it. In the case of no
3051 recipients or stderr error writing, throw the data file away afterwards, and
3052 exit. (This can't be SMTP, which always ensures there's at least one
3053 syntactically good recipient address.) */
3054
3055 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3056 {
3057 DEBUG(D_receive)
3058 {
3059 if (recipients_count == 0) debug_printf("*** No recipients\n");
3060 if (bad_addresses != NULL)
3061 {
3062 error_block *eblock = bad_addresses;
3063 debug_printf("*** Bad address(es)\n");
3064 while (eblock != NULL)
3065 {
3066 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3067 eblock = eblock->next;
3068 }
3069 }
3070 }
3071
3072 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3073
3074 /* If configured to send errors to the sender, but this fails, force
3075 a failure error code. We use a special one for no recipients so that it
3076 can be detected by the autoreply transport. Otherwise error_rc is set to
3077 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3078 it is EXIT_SUCCESS. */
3079
3080 if (error_handling == ERRORS_SENDER)
3081 {
3082 if (!moan_to_sender(
3083 (bad_addresses == NULL)?
3084 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3085 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3086 bad_addresses, header_list, data_file, FALSE))
3087 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3088 }
3089 else
3090 {
3091 if (bad_addresses == NULL)
3092 {
3093 if (extracted_ignored)
3094 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3095 else
3096 fprintf(stderr, "exim: no recipients in message\n");
3097 }
3098 else
3099 {
3100 fprintf(stderr, "exim: invalid address%s",
3101 (bad_addresses->next == NULL)? ":" : "es:\n");
3102 while (bad_addresses != NULL)
3103 {
3104 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3105 bad_addresses->text2);
3106 bad_addresses = bad_addresses->next;
3107 }
3108 }
3109 }
3110
3111 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3112 {
3113 Uunlink(spool_name);
3114 (void)fclose(data_file);
3115 exim_exit(error_rc);
3116 }
3117 }
3118
3119 /* Data file successfully written. Generate text for the Received: header by
3120 expanding the configured string, and adding a timestamp. By leaving this
3121 operation till now, we ensure that the timestamp is the time that message
3122 reception was completed. However, this is deliberately done before calling the
3123 data ACL and local_scan().
3124
3125 This Received: header may therefore be inspected by the data ACL and by code in
3126 the local_scan() function. When they have run, we update the timestamp to be
3127 the final time of reception.
3128
3129 If there is just one recipient, set up its value in the $received_for variable
3130 for use when we generate the Received: header.
3131
3132 Note: the checking for too many Received: headers is handled by the delivery
3133 code. */
3134 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3135
3136 if (received_header->text == NULL) /* Non-cutthrough case */
3137 {
3138 received_header_gen();
3139
3140 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3141
3142 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3143 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3144
3145 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3146 now, before running the DATA ACL. */
3147
3148 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3149 }
3150 else
3151 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3152 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3153
3154 /* If an ACL is specified for checking things at this stage of reception of a
3155 message, run it, unless all the recipients were removed by "discard" in earlier
3156 ACLs. That is the only case in which recipients_count can be zero at this
3157 stage. Set deliver_datafile to point to the data file so that $message_body and
3158 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3159 */
3160
3161 deliver_datafile = data_fd;
3162 user_msg = NULL;
3163
3164 enable_dollar_recipients = TRUE;
3165
3166 if (recipients_count == 0)
3167 {
3168 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3169 }
3170 else
3171 {
3172 /* Handle interactive SMTP messages */
3173
3174 if (smtp_input && !smtp_batched_input)
3175 {
3176
3177 #ifndef DISABLE_DKIM
3178 if (!dkim_disable_verify)
3179 {
3180 /* Finish verification, this will log individual signature results to
3181 the mainlog */
3182 dkim_exim_verify_finish();
3183
3184 /* Check if we must run the DKIM ACL */
3185 if ((acl_smtp_dkim != NULL) &&
3186 (dkim_verify_signers != NULL) &&
3187 (dkim_verify_signers[0] != '\0'))
3188 {
3189 uschar *dkim_verify_signers_expanded =
3190 expand_string(dkim_verify_signers);
3191 if (dkim_verify_signers_expanded == NULL)
3192 {
3193 log_write(0, LOG_MAIN|LOG_PANIC,
3194 "expansion of dkim_verify_signers option failed: %s",
3195 expand_string_message);
3196 }
3197 else
3198 {
3199 int sep = 0;
3200 const uschar *ptr = dkim_verify_signers_expanded;
3201 uschar *item = NULL;
3202 uschar *seen_items = NULL;
3203 int seen_items_size = 0;
3204 int seen_items_offset = 0;
3205 uschar itembuf[256];
3206 /* Default to OK when no items are present */
3207 rc = OK;
3208 while ((item = string_nextinlist(&ptr, &sep,
3209 itembuf,
3210 sizeof(itembuf))))
3211 {
3212 /* Prevent running ACL for an empty item */
3213 if (!item || (item[0] == '\0')) continue;
3214
3215 /* Only run ACL once for each domain or identity,
3216 no matter how often it appears in the expanded list. */
3217 if (seen_items)
3218 {
3219 uschar *seen_item = NULL;
3220 uschar seen_item_buf[256];
3221 const uschar *seen_items_list = seen_items;
3222 BOOL seen_this_item = FALSE;
3223
3224 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3225 seen_item_buf,
3226 sizeof(seen_item_buf))))
3227 if (Ustrcmp(seen_item,item) == 0)
3228 {
3229 seen_this_item = TRUE;
3230 break;
3231 }
3232
3233 if (seen_this_item)
3234 {
3235 DEBUG(D_receive)
3236 debug_printf("acl_smtp_dkim: skipping signer %s, "
3237 "already seen\n", item);
3238 continue;
3239 }
3240
3241 seen_items = string_append(seen_items, &seen_items_size,
3242 &seen_items_offset, 1, ":");
3243 }
3244
3245 seen_items = string_append(seen_items, &seen_items_size,
3246 &seen_items_offset, 1, item);
3247 seen_items[seen_items_offset] = '\0';
3248
3249 DEBUG(D_receive)
3250 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3251 item);
3252
3253 dkim_exim_acl_setup(item);
3254 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3255 &user_msg, &log_msg);
3256
3257 if (rc != OK)
3258 {
3259 DEBUG(D_receive)
3260 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3261 "skipping remaining items\n", rc, item);
3262 cancel_cutthrough_connection("dkim acl not ok");
3263 break;
3264 }
3265 }
3266 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3267 if (rc == DISCARD)
3268 {
3269 recipients_count = 0;
3270 blackholed_by = US"DKIM ACL";
3271 if (log_msg != NULL)
3272 blackhole_log_msg = string_sprintf(": %s", log_msg);
3273 }
3274 else if (rc != OK)
3275 {
3276 Uunlink(spool_name);
3277 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3278 smtp_yield = FALSE; /* No more messages after dropped connection */
3279 smtp_reply = US""; /* Indicate reply already sent */
3280 message_id[0] = 0; /* Indicate no message accepted */
3281 goto TIDYUP; /* Skip to end of function */
3282 }
3283 }
3284 }
3285 }
3286 #endif /* DISABLE_DKIM */
3287
3288 #ifdef WITH_CONTENT_SCAN
3289 if (recipients_count > 0 &&
3290 acl_smtp_mime != NULL &&
3291 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3292 goto TIDYUP;
3293 #endif /* WITH_CONTENT_SCAN */
3294
3295 #ifdef EXPERIMENTAL_DMARC
3296 dmarc_up = dmarc_store_data(from_header);
3297 #endif /* EXPERIMENTAL_DMARC */
3298
3299 #ifndef DISABLE_PRDR
3300 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3301 {
3302 unsigned int c;
3303 int all_pass = OK;
3304 int all_fail = FAIL;
3305
3306 smtp_printf("353 PRDR content analysis beginning\r\n");
3307 /* Loop through recipients, responses must be in same order received */
3308 for (c = 0; recipients_count > c; c++)
3309 {
3310 uschar * addr= recipients_list[c].address;
3311 uschar * msg= US"PRDR R=<%s> %s";
3312 uschar * code;
3313 DEBUG(D_receive)
3314 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3315 addr, c+1, recipients_count);
3316 rc = acl_check(ACL_WHERE_PRDR, addr,
3317 acl_smtp_data_prdr, &user_msg, &log_msg);
3318
3319 /* If any recipient rejected content, indicate it in final message */
3320 all_pass |= rc;
3321 /* If all recipients rejected, indicate in final message */
3322 all_fail &= rc;
3323
3324 switch (rc)
3325 {
3326 case OK: case DISCARD: code = US"250"; break;
3327 case DEFER: code = US"450"; break;
3328 default: code = US"550"; break;
3329 }
3330 if (user_msg != NULL)
3331 smtp_user_msg(code, user_msg);
3332 else
3333 {
3334 switch (rc)
3335 {
3336 case OK: case DISCARD:
3337 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3338 case DEFER:
3339 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3340 default:
3341 msg = string_sprintf(CS msg, addr, "refusal"); break;
3342 }
3343 smtp_user_msg(code, msg);
3344 }
3345 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3346 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3347 else log_write(0, LOG_MAIN, "%s", CS msg);
3348
3349 if (rc != OK) { receive_remove_recipient(addr); c--; }
3350 }
3351 /* Set up final message, used if data acl gives OK */
3352 smtp_reply = string_sprintf("%s id=%s message %s",
3353 all_fail == FAIL ? US"550" : US"250",
3354 message_id,
3355 all_fail == FAIL
3356 ? US"rejected for all recipients"
3357 : all_pass == OK
3358 ? US"accepted"
3359 : US"accepted for some recipients");
3360 if (recipients_count == 0)
3361 {
3362 message_id[0] = 0; /* Indicate no message accepted */
3363 goto TIDYUP;
3364 }
3365 }
3366 else
3367 prdr_requested = FALSE;
3368 #endif /* !DISABLE_PRDR */
3369
3370 /* Check the recipients count again, as the MIME ACL might have changed
3371 them. */
3372
3373 if (acl_smtp_data != NULL && recipients_count > 0)
3374 {
3375 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3376 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3377 if (rc == DISCARD)
3378 {
3379 recipients_count = 0;
3380 blackholed_by = US"DATA ACL";
3381 if (log_msg != NULL)
3382 blackhole_log_msg = string_sprintf(": %s", log_msg);
3383 cancel_cutthrough_connection("data acl discard");
3384 }
3385 else if (rc != OK)
3386 {
3387 Uunlink(spool_name);
3388 cancel_cutthrough_connection("data acl not ok");
3389 #ifdef WITH_CONTENT_SCAN
3390 unspool_mbox();
3391 #endif
3392 #ifdef EXPERIMENTAL_DCC
3393 dcc_ok = 0;
3394 #endif
3395 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3396 smtp_yield = FALSE; /* No more messages after dropped connection */
3397 smtp_reply = US""; /* Indicate reply already sent */
3398 message_id[0] = 0; /* Indicate no message accepted */
3399 goto TIDYUP; /* Skip to end of function */
3400 }
3401 }
3402 }
3403
3404 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3405 we cannot take different actions for permanent and temporary rejections. */
3406
3407 else
3408 {
3409
3410 #ifdef WITH_CONTENT_SCAN
3411 if (acl_not_smtp_mime != NULL &&
3412 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3413 &blackholed_by))
3414 goto TIDYUP;
3415 #endif /* WITH_CONTENT_SCAN */
3416
3417 if (acl_not_smtp != NULL)
3418 {
3419 uschar *user_msg, *log_msg;
3420 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3421 if (rc == DISCARD)
3422 {
3423 recipients_count = 0;
3424 blackholed_by = US"non-SMTP ACL";
3425 if (log_msg != NULL)
3426 blackhole_log_msg = string_sprintf(": %s", log_msg);
3427 }
3428 else if (rc != OK)
3429 {
3430 Uunlink(spool_name);
3431 #ifdef WITH_CONTENT_SCAN
3432 unspool_mbox();
3433 #endif
3434 #ifdef EXPERIMENTAL_DCC
3435 dcc_ok = 0;
3436 #endif
3437 /* The ACL can specify where rejections are to be logged, possibly
3438 nowhere. The default is main and reject logs. */
3439
3440 if (log_reject_target != 0)
3441 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3442 sender_address, log_msg);
3443
3444 if (user_msg == NULL) user_msg = US"local configuration problem";
3445 if (smtp_batched_input)
3446 {
3447 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3448 /* Does not return */
3449 }
3450 else
3451 {
3452 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3453 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3454 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3455 header_list);
3456 /* Does not return */
3457 }
3458 }
3459 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3460 }
3461 }
3462
3463 /* The applicable ACLs have been run */
3464
3465 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3466 if (queue_only_policy) queued_by = US"ACL";
3467 }
3468
3469 #ifdef WITH_CONTENT_SCAN
3470 unspool_mbox();
3471 #endif
3472
3473 #ifdef EXPERIMENTAL_DCC
3474 dcc_ok = 0;
3475 #endif
3476
3477
3478 /* The final check on the message is to run the scan_local() function. The
3479 version supplied with Exim always accepts, but this is a hook for sysadmins to
3480 supply their own checking code. The local_scan() function is run even when all
3481 the recipients have been discarded. */
3482
3483 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3484
3485 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3486 deleted, and the incident gets logged. */
3487
3488 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3489 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3490 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3491 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3492
3493 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n