3b048252d30e0754b58a0f99e625b54397670d5b
[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 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)
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 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
894 CHUNKING. We assume that the incoming has proper CRLF, so only have to scan
895 for and strip CR. On the downside there are more protocol reasons to stop.
896
897 Arguments:
898 fout a FILE to which to write the message; NULL if skipping
899
900 Returns: One of the END_xxx values indicating why it stopped reading
901 */
902
903 static int
904 read_message_bdat_smtp(FILE *fout)
905 {
906 int ch;
907 int linelength = 0;
908
909 for (;;) switch (ch = bdat_getc())
910 {
911 case EOF: return END_EOF;
912 case EOD: return END_DOT;
913 case ERR: return END_PROTOCOL;
914
915 case '\r':
916 body_linecount++;
917 if (linelength > max_received_linelength)
918 max_received_linelength = linelength;
919 linelength = -1;
920 break;
921
922 case 0:
923 body_zerocount++;
924 /*FALLTHROUGH*/
925 default:
926 message_size++;
927 linelength++;
928 if (fout)
929 {
930 if (fputc(ch, fout) == EOF) return END_WERROR;
931 if (message_size > thismessage_size_limit) return END_SIZE;
932 }
933 #ifdef notyet
934 if(ch == '\n')
935 (void) cutthrough_put_nl();
936 else
937 {
938 uschar c = ch;
939 (void) cutthrough_puts(&c, 1);
940 }
941 #endif
942 break;
943 }
944 /*NOTREACHED*/
945 }
946
947
948
949
950 /*************************************************
951 * Swallow SMTP message *
952 *************************************************/
953
954 /* This function is called when there has been some kind of error while reading
955 an SMTP message, and the remaining data may need to be swallowed. It is global
956 because it is called from smtp_closedown() to shut down an incoming call
957 tidily.
958
959 Argument: a FILE from which to read the message
960 Returns: nothing
961 */
962
963 void
964 receive_swallow_smtp(void)
965 {
966 /*XXX CHUNKING: not enough. read chunks until RSET? */
967 if (message_ended >= END_NOTENDED)
968 message_ended = read_message_data_smtp(NULL);
969 }
970
971
972
973 /*************************************************
974 * Handle lost SMTP connection *
975 *************************************************/
976
977 /* This function logs connection loss incidents and generates an appropriate
978 SMTP response.
979
980 Argument: additional data for the message
981 Returns: the SMTP response
982 */
983
984 static uschar *
985 handle_lost_connection(uschar *s)
986 {
987 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
988 "%s lost while reading message data%s", smtp_get_connection_info(), s);
989 return US"421 Lost incoming connection";
990 }
991
992
993
994
995 /*************************************************
996 * Handle a non-smtp reception error *
997 *************************************************/
998
999 /* This function is called for various errors during the reception of non-SMTP
1000 messages. It either sends a message to the sender of the problem message, or it
1001 writes to the standard error stream.
1002
1003 Arguments:
1004 errcode code for moan_to_sender(), identifying the error
1005 text1 first message text, passed to moan_to_sender()
1006 text2 second message text, used only for stderrr
1007 error_rc code to pass to exim_exit if no problem
1008 f FILE containing body of message (may be stdin)
1009 hptr pointer to instore headers or NULL
1010
1011 Returns: calls exim_exit(), which does not return
1012 */
1013
1014 static void
1015 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1016 FILE *f, header_line *hptr)
1017 {
1018 if (error_handling == ERRORS_SENDER)
1019 {
1020 error_block eblock;
1021 eblock.next = NULL;
1022 eblock.text1 = text1;
1023 eblock.text2 = US"";
1024 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1025 error_rc = EXIT_FAILURE;
1026 }
1027 else
1028 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1029 (void)fclose(f);
1030 exim_exit(error_rc);
1031 }
1032
1033
1034
1035 /*************************************************
1036 * Add header lines set up by ACL *
1037 *************************************************/
1038
1039 /* This function is called to add the header lines that were set up by
1040 statements in an ACL to the list of headers in memory. It is done in two stages
1041 like this, because when the ACL for RCPT is running, the other headers have not
1042 yet been received. This function is called twice; once just before running the
1043 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1044 are visible to the DATA ACL.
1045
1046 Originally these header lines were added at the end. Now there is support for
1047 three different places: top, bottom, and after the Received: header(s). There
1048 will always be at least one Received: header, even if it is marked deleted, and
1049 even if something else has been put in front of it.
1050
1051 Arguments:
1052 acl_name text to identify which ACL
1053
1054 Returns: nothing
1055 */
1056
1057 static void
1058 add_acl_headers(int where, uschar *acl_name)
1059 {
1060 header_line *h, *next;
1061 header_line *last_received = NULL;
1062
1063 switch(where)
1064 {
1065 case ACL_WHERE_DKIM:
1066 case ACL_WHERE_MIME:
1067 case ACL_WHERE_DATA:
1068 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1069 {
1070 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1071 " will not take effect on cutthrough deliveries");
1072 return;
1073 }
1074 }
1075
1076 if (acl_removed_headers != NULL)
1077 {
1078 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1079
1080 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1081 {
1082 const uschar * list = acl_removed_headers;
1083 int sep = ':'; /* This is specified as a colon-separated list */
1084 uschar *s;
1085 uschar buffer[128];
1086
1087 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1088 if (header_testname(h, s, Ustrlen(s), FALSE))
1089 {
1090 h->type = htype_old;
1091 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1092 }
1093 }
1094 acl_removed_headers = NULL;
1095 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1096 }
1097
1098 if (acl_added_headers == NULL) return;
1099 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1100
1101 for (h = acl_added_headers; h != NULL; h = next)
1102 {
1103 next = h->next;
1104
1105 switch(h->type)
1106 {
1107 case htype_add_top:
1108 h->next = header_list;
1109 header_list = h;
1110 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1111 break;
1112
1113 case htype_add_rec:
1114 if (last_received == NULL)
1115 {
1116 last_received = header_list;
1117 while (!header_testname(last_received, US"Received", 8, FALSE))
1118 last_received = last_received->next;
1119 while (last_received->next != NULL &&
1120 header_testname(last_received->next, US"Received", 8, FALSE))
1121 last_received = last_received->next;
1122 }
1123 h->next = last_received->next;
1124 last_received->next = h;
1125 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1126 break;
1127
1128 case htype_add_rfc:
1129 /* add header before any header which is NOT Received: or Resent- */
1130 last_received = header_list;
1131 while ( (last_received->next != NULL) &&
1132 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1133 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1134 last_received = last_received->next;
1135 /* last_received now points to the last Received: or Resent-* header
1136 in an uninterrupted chain of those header types (seen from the beginning
1137 of all headers. Our current header must follow it. */
1138 h->next = last_received->next;
1139 last_received->next = h;
1140 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1141 break;
1142
1143 default:
1144 h->next = NULL;
1145 header_last->next = h;
1146 break;
1147 }
1148
1149 if (h->next == NULL) header_last = h;
1150
1151 /* Check for one of the known header types (From:, To:, etc.) though in
1152 practice most added headers are going to be "other". Lower case
1153 identification letters are never stored with the header; they are used
1154 for existence tests when messages are received. So discard any lower case
1155 flag values. */
1156
1157 h->type = header_checkname(h, FALSE);
1158 if (h->type >= 'a') h->type = htype_other;
1159
1160 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1161 }
1162
1163 acl_added_headers = NULL;
1164 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1165 }
1166
1167
1168
1169 /*************************************************
1170 * Add host information for log line *
1171 *************************************************/
1172
1173 /* Called for acceptance and rejecting log lines. This adds information about
1174 the calling host to a string that is being built dynamically.
1175
1176 Arguments:
1177 s the dynamic string
1178 sizeptr points to the size variable
1179 ptrptr points to the pointer variable
1180
1181 Returns: the extended string
1182 */
1183
1184 static uschar *
1185 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1186 {
1187 if (sender_fullhost)
1188 {
1189 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1190 s = string_cat(s, sizeptr, ptrptr, US" DS");
1191 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1192 if (LOGGING(incoming_interface) && interface_address != NULL)
1193 {
1194 s = string_cat(s, sizeptr, ptrptr,
1195 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1196 }
1197 }
1198 if (sender_ident != NULL)
1199 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1200 if (received_protocol != NULL)
1201 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1202 return s;
1203 }
1204
1205
1206
1207 #ifdef WITH_CONTENT_SCAN
1208
1209 /*************************************************
1210 * Run the MIME ACL on a message *
1211 *************************************************/
1212
1213 /* This code is in a subroutine so that it can be used for both SMTP
1214 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1215
1216 Arguments:
1217 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1218 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1219 smtp_reply_ptr Where SMTP reply is being built
1220 blackholed_by_ptr Where "blackholed by" message is being built
1221
1222 Returns: TRUE to carry on; FALSE to abandon the message
1223 */
1224
1225 static BOOL
1226 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1227 uschar **blackholed_by_ptr)
1228 {
1229 FILE *mbox_file;
1230 uschar rfc822_file_path[2048];
1231 unsigned long mbox_size;
1232 header_line *my_headerlist;
1233 uschar *user_msg, *log_msg;
1234 int mime_part_count_buffer = -1;
1235 int rc = OK;
1236
1237 memset(CS rfc822_file_path,0,2048);
1238
1239 /* check if it is a MIME message */
1240 my_headerlist = header_list;
1241 while (my_headerlist != NULL)
1242 {
1243 /* skip deleted headers */
1244 if (my_headerlist->type == '*')
1245 {
1246 my_headerlist = my_headerlist->next;
1247 continue;
1248 }
1249 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1250 {
1251 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1252 goto DO_MIME_ACL;
1253 }
1254 my_headerlist = my_headerlist->next;
1255 }
1256
1257 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1258 return TRUE;
1259
1260 DO_MIME_ACL:
1261 /* make sure the eml mbox file is spooled up */
1262 mbox_file = spool_mbox(&mbox_size, NULL);
1263 if (mbox_file == NULL) {
1264 /* error while spooling */
1265 log_write(0, LOG_MAIN|LOG_PANIC,
1266 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1267 Uunlink(spool_name);
1268 unspool_mbox();
1269 #ifdef EXPERIMENTAL_DCC
1270 dcc_ok = 0;
1271 #endif
1272 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1273 message_id[0] = 0; /* Indicate no message accepted */
1274 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1275 return FALSE; /* Indicate skip to end of receive function */
1276 };
1277
1278 mime_is_rfc822 = 0;
1279
1280 MIME_ACL_CHECK:
1281 mime_part_count = -1;
1282 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1283 (void)fclose(mbox_file);
1284
1285 if (Ustrlen(rfc822_file_path) > 0)
1286 {
1287 mime_part_count = mime_part_count_buffer;
1288
1289 if (unlink(CS rfc822_file_path) == -1)
1290 {
1291 log_write(0, LOG_PANIC,
1292 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1293 goto END_MIME_ACL;
1294 }
1295 }
1296
1297 /* check if we must check any message/rfc822 attachments */
1298 if (rc == OK)
1299 {
1300 uschar temp_path[1024];
1301 struct dirent * entry;
1302 DIR * tempdir;
1303
1304 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1305 spool_directory, message_id);
1306
1307 tempdir = opendir(CS temp_path);
1308 for (;;)
1309 {
1310 if (!(entry = readdir(tempdir)))
1311 break;
1312 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1313 {
1314 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1315 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1316 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1317 rfc822_file_path);
1318 break;
1319 }
1320 }
1321 closedir(tempdir);
1322
1323 if (entry)
1324 {
1325 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1326 {
1327 /* set RFC822 expansion variable */
1328 mime_is_rfc822 = 1;
1329 mime_part_count_buffer = mime_part_count;
1330 goto MIME_ACL_CHECK;
1331 }
1332 log_write(0, LOG_PANIC,
1333 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1334 unlink(CS rfc822_file_path);
1335 }
1336 }
1337
1338 END_MIME_ACL:
1339 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1340 if (rc == DISCARD)
1341 {
1342 recipients_count = 0;
1343 *blackholed_by_ptr = US"MIME ACL";
1344 }
1345 else if (rc != OK)
1346 {
1347 Uunlink(spool_name);
1348 unspool_mbox();
1349 #ifdef EXPERIMENTAL_DCC
1350 dcc_ok = 0;
1351 #endif
1352 if ( smtp_input
1353 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1354 {
1355 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1356 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1357 }
1358 message_id[0] = 0; /* Indicate no message accepted */
1359 return FALSE; /* Cause skip to end of receive function */
1360 }
1361
1362 return TRUE;
1363 }
1364
1365 #endif /* WITH_CONTENT_SCAN */
1366
1367
1368
1369 void
1370 received_header_gen(void)
1371 {
1372 uschar *received;
1373 uschar *timestamp;
1374 header_line *received_header= header_list;
1375
1376 timestamp = expand_string(US"${tod_full}");
1377 if (recipients_count == 1) received_for = recipients_list[0].address;
1378 received = expand_string(received_header_text);
1379 received_for = NULL;
1380
1381 if (!received)
1382 {
1383 if(spool_name[0] != 0)
1384 Uunlink(spool_name); /* Lose the data file */
1385 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1386 "(received_header_text) failed: %s", string_printing(received_header_text),
1387 expand_string_message);
1388 }
1389
1390 /* The first element on the header chain is reserved for the Received header,
1391 so all we have to do is fill in the text pointer, and set the type. However, if
1392 the result of the expansion is an empty string, we leave the header marked as
1393 "old" so as to refrain from adding a Received header. */
1394
1395 if (received[0] == 0)
1396 {
1397 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1398 received_header->type = htype_old;
1399 }
1400 else
1401 {
1402 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1403 received_header->type = htype_received;
1404 }
1405
1406 received_header->slen = Ustrlen(received_header->text);
1407
1408 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1409 received_header->type, received_header->text);
1410 }
1411
1412
1413
1414 /*************************************************
1415 * Receive message *
1416 *************************************************/
1417
1418 /* Receive a message on the given input, and put it into a pair of spool files.
1419 Either a non-null list of recipients, or the extract flag will be true, or
1420 both. The flag sender_local is true for locally generated messages. The flag
1421 submission_mode is true if an ACL has obeyed "control = submission". The flag
1422 suppress_local_fixups is true if an ACL has obeyed "control =
1423 suppress_local_fixups" or -G was passed on the command-line.
1424 The flag smtp_input is true if the message is to be
1425 handled using SMTP conventions about termination and lines starting with dots.
1426 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1427
1428 If a message was successfully read, message_id[0] will be non-zero.
1429
1430 The general actions of this function are:
1431
1432 . Read the headers of the message (if any) into a chain of store
1433 blocks.
1434
1435 . If there is a "sender:" header and the message is locally originated,
1436 throw it away, unless the caller is trusted, or unless
1437 active_local_sender_retain is set - which can only happen if
1438 active_local_from_check is false.
1439
1440 . If recipients are to be extracted from the message, build the
1441 recipients list from the headers, removing any that were on the
1442 original recipients list (unless extract_addresses_remove_arguments is
1443 false), and at the same time, remove any bcc header that may be present.
1444
1445 . Get the spool file for the data, sort out its unique name, open
1446 and lock it (but don't give it the name yet).
1447
1448 . Generate a "Message-Id" header if the message doesn't have one, for
1449 locally-originated messages.
1450
1451 . Generate a "Received" header.
1452
1453 . Ensure the recipients list is fully qualified and rewritten if necessary.
1454
1455 . If there are any rewriting rules, apply them to the sender address
1456 and also to the headers.
1457
1458 . If there is no from: header, generate one, for locally-generated messages
1459 and messages in "submission mode" only.
1460
1461 . If the sender is local, check that from: is correct, and if not, generate
1462 a Sender: header, unless message comes from a trusted caller, or this
1463 feature is disabled by active_local_from_check being false.
1464
1465 . If there is no "date" header, generate one, for locally-originated
1466 or submission mode messages only.
1467
1468 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1469 dot_ends mode, to the data file. Leave it open, to hold the lock.
1470
1471 . Write the envelope and the headers to a new file.
1472
1473 . Set the name for the header file; close it.
1474
1475 . Set the name for the data file; close it.
1476
1477 Because this function can potentially be called many times in a single
1478 SMTP connection, all store should be got by store_get(), so that it will be
1479 automatically retrieved after the message is accepted.
1480
1481 FUDGE: It seems that sites on the net send out messages with just LF
1482 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1483 we make the CRs optional in all cases.
1484
1485 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1486 new regime is now in place in which bare CRs in header lines are turned into LF
1487 followed by a space, so as not to terminate the header line.
1488
1489 February 2004: A bare LF in a header line in a message whose first line was
1490 terminated by CRLF is treated in the same way as a bare CR.
1491
1492 Arguments:
1493 extract_recip TRUE if recipients are to be extracted from the message's
1494 headers
1495
1496 Returns: TRUE there are more messages to be read (SMTP input)
1497 FALSE there are no more messages to be read (non-SMTP input
1498 or SMTP connection collapsed, or other failure)
1499
1500 When reading a message for filter testing, the returned value indicates
1501 whether the headers (which is all that is read) were terminated by '.' or
1502 not. */
1503
1504 BOOL
1505 receive_msg(BOOL extract_recip)
1506 {
1507 int i;
1508 int rc = FAIL;
1509 int msg_size = 0;
1510 int process_info_len = Ustrlen(process_info);
1511 int error_rc = (error_handling == ERRORS_SENDER)?
1512 errors_sender_rc : EXIT_FAILURE;
1513 int header_size = 256;
1514 int start, end, domain, size, sptr;
1515 int id_resolution;
1516 int had_zero = 0;
1517 int prevlines_length = 0;
1518
1519 register int ptr = 0;
1520
1521 BOOL contains_resent_headers = FALSE;
1522 BOOL extracted_ignored = FALSE;
1523 BOOL first_line_ended_crlf = TRUE_UNSET;
1524 BOOL smtp_yield = TRUE;
1525 BOOL yield = FALSE;
1526
1527 BOOL resents_exist = FALSE;
1528 uschar *resent_prefix = US"";
1529 uschar *blackholed_by = NULL;
1530 uschar *blackhole_log_msg = US"";
1531 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1532
1533 flock_t lock_data;
1534 error_block *bad_addresses = NULL;
1535
1536 uschar *frozen_by = NULL;
1537 uschar *queued_by = NULL;
1538
1539 uschar *errmsg, *s;
1540 struct stat statbuf;
1541
1542 /* Final message to give to SMTP caller, and messages from ACLs */
1543
1544 uschar *smtp_reply = NULL;
1545 uschar *user_msg, *log_msg;
1546
1547 /* Working header pointers */
1548
1549 header_line *h, *next;
1550
1551 /* Flags for noting the existence of certain headers (only one left) */
1552
1553 BOOL date_header_exists = FALSE;
1554
1555 /* Pointers to receive the addresses of headers whose contents we need. */
1556
1557 header_line *from_header = NULL;
1558 header_line *subject_header = NULL;
1559 header_line *msgid_header = NULL;
1560 header_line *received_header;
1561
1562 #ifdef EXPERIMENTAL_DMARC
1563 int dmarc_up = 0;
1564 #endif /* EXPERIMENTAL_DMARC */
1565
1566 /* Variables for use when building the Received: header. */
1567
1568 uschar *timestamp;
1569 int tslen;
1570
1571 /* Release any open files that might have been cached while preparing to
1572 accept the message - e.g. by verifying addresses - because reading a message
1573 might take a fair bit of real time. */
1574
1575 search_tidyup();
1576
1577 /* Extracting the recipient list from an input file is incompatible with
1578 cutthrough delivery with the no-spool option. It shouldn't be possible
1579 to set up the combination, but just in case kill any ongoing connection. */
1580 if (extract_recip || !smtp_input)
1581 cancel_cutthrough_connection("not smtp input");
1582
1583 /* Initialize the chain of headers by setting up a place-holder for Received:
1584 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1585 pointing to the end of the chain to make adding headers simple. */
1586
1587 received_header = header_list = header_last = store_get(sizeof(header_line));
1588 header_list->next = NULL;
1589 header_list->type = htype_old;
1590 header_list->text = NULL;
1591 header_list->slen = 0;
1592
1593 /* Control block for the next header to be read. */
1594
1595 next = store_get(sizeof(header_line));
1596 next->text = store_get(header_size);
1597
1598 /* Initialize message id to be null (indicating no message read), and the
1599 header names list to be the normal list. Indicate there is no data file open
1600 yet, initialize the size and warning count, and deal with no size limit. */
1601
1602 message_id[0] = 0;
1603 data_file = NULL;
1604 data_fd = -1;
1605 spool_name = US"";
1606 message_size = 0;
1607 warning_count = 0;
1608 received_count = 1; /* For the one we will add */
1609
1610 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1611
1612 /* While reading the message, the following counts are computed. */
1613
1614 message_linecount = body_linecount = body_zerocount =
1615 max_received_linelength = 0;
1616
1617 #ifndef DISABLE_DKIM
1618 /* Call into DKIM to set up the context. */
1619 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1620 #endif
1621
1622 #ifdef EXPERIMENTAL_DMARC
1623 /* initialize libopendmarc */
1624 dmarc_up = dmarc_init();
1625 #endif
1626
1627 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1628 ids, and fractions of a second are required. See the comments that precede the
1629 message id creation below. */
1630
1631 (void)gettimeofday(&message_id_tv, NULL);
1632
1633 /* For other uses of the received time we can operate with granularity of one
1634 second, and for that we use the global variable received_time. This is for
1635 things like ultimate message timeouts. */
1636
1637 received_time = message_id_tv.tv_sec;
1638
1639 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1640 happen in the smtp_getc() function when it refills its buffer. */
1641
1642 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1643
1644 /* If not SMTP input, timeout happens only if configured, and we just set a
1645 single timeout for the whole message. */
1646
1647 else if (receive_timeout > 0)
1648 {
1649 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1650 alarm(receive_timeout);
1651 }
1652
1653 /* SIGTERM and SIGINT are caught always. */
1654
1655 signal(SIGTERM, data_sigterm_sigint_handler);
1656 signal(SIGINT, data_sigterm_sigint_handler);
1657
1658 /* Header lines in messages are not supposed to be very long, though when
1659 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1660 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1661 storing the header, and extend this as necessary using string_cat().
1662
1663 To cope with total lunacies, impose an upper limit on the length of the header
1664 section of the message, as otherwise the store will fill up. We must also cope
1665 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1666 Folded header lines are joined into one string, leaving the '\n' characters
1667 inside them, so that writing them out reproduces the input.
1668
1669 Loop for each character of each header; the next structure for chaining the
1670 header is set up already, with ptr the offset of the next character in
1671 next->text. */
1672
1673 for (;;)
1674 {
1675 int ch = (receive_getc)();
1676
1677 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1678 SMTP must have a correct "." terminator. */
1679
1680 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1681 {
1682 smtp_reply = handle_lost_connection(US" (header)");
1683 smtp_yield = FALSE;
1684 goto TIDYUP; /* Skip to end of function */
1685 }
1686
1687 /* See if we are at the current header's size limit - there must be at least
1688 four bytes left. This allows for the new character plus a zero, plus two for
1689 extra insertions when we are playing games with dots and carriage returns. If
1690 we are at the limit, extend the text buffer. This could have been done
1691 automatically using string_cat() but because this is a tightish loop storing
1692 only one character at a time, we choose to do it inline. Normally
1693 store_extend() will be able to extend the block; only at the end of a big
1694 store block will a copy be needed. To handle the case of very long headers
1695 (and sometimes lunatic messages can have ones that are 100s of K long) we
1696 call store_release() for strings that have been copied - if the string is at
1697 the start of a block (and therefore the only thing in it, because we aren't
1698 doing any other gets), the block gets freed. We can only do this because we
1699 know there are no other calls to store_get() going on. */
1700
1701 if (ptr >= header_size - 4)
1702 {
1703 int oldsize = header_size;
1704 /* header_size += 256; */
1705 header_size *= 2;
1706 if (!store_extend(next->text, oldsize, header_size))
1707 {
1708 uschar *newtext = store_get(header_size);
1709 memcpy(newtext, next->text, ptr);
1710 store_release(next->text);
1711 next->text = newtext;
1712 }
1713 }
1714
1715 /* Cope with receiving a binary zero. There is dispute about whether
1716 these should be allowed in RFC 822 messages. The middle view is that they
1717 should not be allowed in headers, at least. Exim takes this attitude at
1718 the moment. We can't just stomp on them here, because we don't know that
1719 this line is a header yet. Set a flag to cause scanning later. */
1720
1721 if (ch == 0) had_zero++;
1722
1723 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1724 those from data files use just LF. Treat LF in local SMTP input as a
1725 terminator too. Treat EOF as a line terminator always. */
1726
1727 if (ch == EOF) goto EOL;
1728
1729 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1730 other MTAs accept this. We are therefore forced into this "liberalisation"
1731 too, so we accept LF as a line terminator whatever the source of the message.
1732 However, if the first line of the message ended with a CRLF, we treat a bare
1733 LF specially by inserting a white space after it to ensure that the header
1734 line is not terminated. */
1735
1736 if (ch == '\n')
1737 {
1738 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1739 else if (first_line_ended_crlf) receive_ungetc(' ');
1740 goto EOL;
1741 }
1742
1743 /* This is not the end of the line. If this is SMTP input and this is
1744 the first character in the line and it is a "." character, ignore it.
1745 This implements the dot-doubling rule, though header lines starting with
1746 dots aren't exactly common. They are legal in RFC 822, though. If the
1747 following is CRLF or LF, this is the line that that terminates the
1748 entire message. We set message_ended to indicate this has happened (to
1749 prevent further reading), and break out of the loop, having freed the
1750 empty header, and set next = NULL to indicate no data line. */
1751
1752 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1753 {
1754 ch = (receive_getc)();
1755 if (ch == '\r')
1756 {
1757 ch = (receive_getc)();
1758 if (ch != '\n')
1759 {
1760 receive_ungetc(ch);
1761 ch = '\r'; /* Revert to CR */
1762 }
1763 }
1764 if (ch == '\n')
1765 {
1766 message_ended = END_DOT;
1767 store_reset(next);
1768 next = NULL;
1769 break; /* End character-reading loop */
1770 }
1771
1772 /* For non-SMTP input, the dot at the start of the line was really a data
1773 character. What is now in ch is the following character. We guaranteed
1774 enough space for this above. */
1775
1776 if (!smtp_input)
1777 {
1778 next->text[ptr++] = '.';
1779 message_size++;
1780 }
1781 }
1782
1783 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1784 remember this case if this is the first line ending. */
1785
1786 if (ch == '\r')
1787 {
1788 ch = (receive_getc)();
1789 if (ch == '\n')
1790 {
1791 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1792 goto EOL;
1793 }
1794
1795 /* Otherwise, put back the character after CR, and turn the bare CR
1796 into LF SP. */
1797
1798 ch = (receive_ungetc)(ch);
1799 next->text[ptr++] = '\n';
1800 message_size++;
1801 ch = ' ';
1802 }
1803
1804 /* We have a data character for the header line. */
1805
1806 next->text[ptr++] = ch; /* Add to buffer */
1807 message_size++; /* Total message size so far */
1808
1809 /* Handle failure due to a humungously long header section. The >= allows
1810 for the terminating \n. Add what we have so far onto the headers list so
1811 that it gets reflected in any error message, and back up the just-read
1812 character. */
1813
1814 if (message_size >= header_maxsize)
1815 {
1816 next->text[ptr] = 0;
1817 next->slen = ptr;
1818 next->type = htype_other;
1819 next->next = NULL;
1820 header_last->next = next;
1821 header_last = next;
1822
1823 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1824 "%s (more than %d characters): message abandoned",
1825 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1826
1827 if (smtp_input)
1828 {
1829 smtp_reply = US"552 Message header is ridiculously long";
1830 receive_swallow_smtp();
1831 goto TIDYUP; /* Skip to end of function */
1832 }
1833
1834 else
1835 {
1836 give_local_error(ERRMESS_VLONGHEADER,
1837 string_sprintf("message header longer than %d characters received: "
1838 "message not accepted", header_maxsize), US"", error_rc, stdin,
1839 header_list->next);
1840 /* Does not return */
1841 }
1842 }
1843
1844 continue; /* With next input character */
1845
1846 /* End of header line reached */
1847
1848 EOL:
1849
1850 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1851
1852 receive_linecount++;
1853 message_linecount++;
1854
1855 /* Keep track of maximum line length */
1856
1857 if (ptr - prevlines_length > max_received_linelength)
1858 max_received_linelength = ptr - prevlines_length;
1859 prevlines_length = ptr + 1;
1860
1861 /* Now put in the terminating newline. There is always space for
1862 at least two more characters. */
1863
1864 next->text[ptr++] = '\n';
1865 message_size++;
1866
1867 /* A blank line signals the end of the headers; release the unwanted
1868 space and set next to NULL to indicate this. */
1869
1870 if (ptr == 1)
1871 {
1872 store_reset(next);
1873 next = NULL;
1874 break;
1875 }
1876
1877 /* There is data in the line; see if the next input character is a
1878 whitespace character. If it is, we have a continuation of this header line.
1879 There is always space for at least one character at this point. */
1880
1881 if (ch != EOF)
1882 {
1883 int nextch = (receive_getc)();
1884 if (nextch == ' ' || nextch == '\t')
1885 {
1886 next->text[ptr++] = nextch;
1887 message_size++;
1888 continue; /* Iterate the loop */
1889 }
1890 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1891 else ch = EOF; /* Cause main loop to exit at end */
1892 }
1893
1894 /* We have got to the real line end. Terminate the string and release store
1895 beyond it. If it turns out to be a real header, internal binary zeros will
1896 be squashed later. */
1897
1898 next->text[ptr] = 0;
1899 next->slen = ptr;
1900 store_reset(next->text + ptr + 1);
1901
1902 /* Check the running total size against the overall message size limit. We
1903 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1904 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1905 headers - the code to read the body will then also hit the buffer. */
1906
1907 if (message_size > thismessage_size_limit) break;
1908
1909 /* A line that is not syntactically correct for a header also marks
1910 the end of the headers. In this case, we leave next containing the
1911 first data line. This might actually be several lines because of the
1912 continuation logic applied above, but that doesn't matter.
1913
1914 It turns out that smail, and presumably sendmail, accept leading lines
1915 of the form
1916
1917 From ph10 Fri Jan 5 12:35 GMT 1996
1918
1919 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1920 find any documentation of this, but for compatibility it had better be
1921 accepted. Exim restricts it to the case of non-smtp messages, and
1922 treats it as an alternative to the -f command line option. Thus it is
1923 ignored except for trusted users or filter testing. Otherwise it is taken
1924 as the sender address, unless -f was used (sendmail compatibility).
1925
1926 It further turns out that some UUCPs generate the From_line in a different
1927 format, e.g.
1928
1929 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1930
1931 The regex for matching these things is now capable of recognizing both
1932 formats (including 2- and 4-digit years in the latter). In fact, the regex
1933 is now configurable, as is the expansion string to fish out the sender.
1934
1935 Even further on it has been discovered that some broken clients send
1936 these lines in SMTP messages. There is now an option to ignore them from
1937 specified hosts or networks. Sigh. */
1938
1939 if (header_last == header_list &&
1940 (!smtp_input
1941 ||
1942 (sender_host_address != NULL &&
1943 verify_check_host(&ignore_fromline_hosts) == OK)
1944 ||
1945 (sender_host_address == NULL && ignore_fromline_local)
1946 ) &&
1947 regex_match_and_setup(regex_From, next->text, 0, -1))
1948 {
1949 if (!sender_address_forced)
1950 {
1951 uschar *uucp_sender = expand_string(uucp_from_sender);
1952 if (uucp_sender == NULL)
1953 {
1954 log_write(0, LOG_MAIN|LOG_PANIC,
1955 "expansion of \"%s\" failed after matching "
1956 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1957 }
1958 else
1959 {
1960 int start, end, domain;
1961 uschar *errmess;
1962 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1963 &start, &end, &domain, TRUE);
1964 if (newsender != NULL)
1965 {
1966 if (domain == 0 && newsender[0] != 0)
1967 newsender = rewrite_address_qualify(newsender, FALSE);
1968
1969 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1970 {
1971 sender_address = newsender;
1972
1973 if (trusted_caller || filter_test != FTEST_NONE)
1974 {
1975 authenticated_sender = NULL;
1976 originator_name = US"";
1977 sender_local = FALSE;
1978 }
1979
1980 if (filter_test != FTEST_NONE)
1981 printf("Sender taken from \"From \" line\n");
1982 }
1983 }
1984 }
1985 }
1986 }
1987
1988 /* Not a leading "From " line. Check to see if it is a valid header line.
1989 Header names may contain any non-control characters except space and colon,
1990 amazingly. */
1991
1992 else
1993 {
1994 uschar *p = next->text;
1995
1996 /* If not a valid header line, break from the header reading loop, leaving
1997 next != NULL, indicating that it holds the first line of the body. */
1998
1999 if (isspace(*p)) break;
2000 while (mac_isgraph(*p) && *p != ':') p++;
2001 while (isspace(*p)) p++;
2002 if (*p != ':')
2003 {
2004 body_zerocount = had_zero;
2005 break;
2006 }
2007
2008 /* We have a valid header line. If there were any binary zeroes in
2009 the line, stomp on them here. */
2010
2011 if (had_zero > 0)
2012 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2013
2014 /* It is perfectly legal to have an empty continuation line
2015 at the end of a header, but it is confusing to humans
2016 looking at such messages, since it looks like a blank line.
2017 Reduce confusion by removing redundant white space at the
2018 end. We know that there is at least one printing character
2019 (the ':' tested for above) so there is no danger of running
2020 off the end. */
2021
2022 p = next->text + ptr - 2;
2023 for (;;)
2024 {
2025 while (*p == ' ' || *p == '\t') p--;
2026 if (*p != '\n') break;
2027 ptr = (p--) - next->text + 1;
2028 message_size -= next->slen - ptr;
2029 next->text[ptr] = 0;
2030 next->slen = ptr;
2031 }
2032
2033 /* Add the header to the chain */
2034
2035 next->type = htype_other;
2036 next->next = NULL;
2037 header_last->next = next;
2038 header_last = next;
2039
2040 /* Check the limit for individual line lengths. This comes after adding to
2041 the chain so that the failing line is reflected if a bounce is generated
2042 (for a local message). */
2043
2044 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2045 {
2046 log_write(0, LOG_MAIN, "overlong message header line received from "
2047 "%s (more than %d characters): message abandoned",
2048 sender_host_unknown? sender_ident : sender_fullhost,
2049 header_line_maxsize);
2050
2051 if (smtp_input)
2052 {
2053 smtp_reply = US"552 A message header line is too long";
2054 receive_swallow_smtp();
2055 goto TIDYUP; /* Skip to end of function */
2056 }
2057
2058 else
2059 {
2060 give_local_error(ERRMESS_VLONGHDRLINE,
2061 string_sprintf("message header line longer than %d characters "
2062 "received: message not accepted", header_line_maxsize), US"",
2063 error_rc, stdin, header_list->next);
2064 /* Does not return */
2065 }
2066 }
2067
2068 /* Note if any resent- fields exist. */
2069
2070 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2071 {
2072 resents_exist = TRUE;
2073 resent_prefix = US"Resent-";
2074 }
2075 }
2076
2077 /* The line has been handled. If we have hit EOF, break out of the loop,
2078 indicating no pending data line. */
2079
2080 if (ch == EOF) { next = NULL; break; }
2081
2082 /* Set up for the next header */
2083
2084 header_size = 256;
2085 next = store_get(sizeof(header_line));
2086 next->text = store_get(header_size);
2087 ptr = 0;
2088 had_zero = 0;
2089 prevlines_length = 0;
2090 } /* Continue, starting to read the next header */
2091
2092 /* At this point, we have read all the headers into a data structure in main
2093 store. The first header is still the dummy placeholder for the Received: header
2094 we are going to generate a bit later on. If next != NULL, it contains the first
2095 data line - which terminated the headers before reaching a blank line (not the
2096 normal case). */
2097
2098 DEBUG(D_receive)
2099 {
2100 debug_printf(">>Headers received:\n");
2101 for (h = header_list->next; h != NULL; h = h->next)
2102 debug_printf("%s", h->text);
2103 debug_printf("\n");
2104 }
2105
2106 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2107 is dropped immediately after valid headers, the next thing we will see is EOF.
2108 We must test for this specially, as further down the reading of the data is
2109 skipped if already at EOF. */
2110
2111 if (smtp_input && (receive_feof)())
2112 {
2113 smtp_reply = handle_lost_connection(US" (after header)");
2114 smtp_yield = FALSE;
2115 goto TIDYUP; /* Skip to end of function */
2116 }
2117
2118 /* If this is a filter test run and no headers were read, output a warning
2119 in case there is a mistake in the test message. */
2120
2121 if (filter_test != FTEST_NONE && header_list->next == NULL)
2122 printf("Warning: no message headers read\n");
2123
2124
2125 /* Scan the headers to identify them. Some are merely marked for later
2126 processing; some are dealt with here. */
2127
2128 for (h = header_list->next; h != NULL; h = h->next)
2129 {
2130 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2131 if (is_resent) contains_resent_headers = TRUE;
2132
2133 switch (header_checkname(h, is_resent))
2134 {
2135 case htype_bcc:
2136 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2137 break;
2138
2139 case htype_cc:
2140 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2141 break;
2142
2143 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2144
2145 case htype_date:
2146 if (!resents_exist || is_resent) date_header_exists = TRUE;
2147 break;
2148
2149 /* Same comments as about Return-Path: below. */
2150
2151 case htype_delivery_date:
2152 if (delivery_date_remove) h->type = htype_old;
2153 break;
2154
2155 /* Same comments as about Return-Path: below. */
2156
2157 case htype_envelope_to:
2158 if (envelope_to_remove) h->type = htype_old;
2159 break;
2160
2161 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2162 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2163 header consists of just the login id of the user who called Exim, rewrite
2164 it with the gecos field first. Apply this rule to Resent-From: if there
2165 are resent- fields. */
2166
2167 case htype_from:
2168 h->type = htype_from;
2169 if (!resents_exist || is_resent)
2170 {
2171 from_header = h;
2172 if (!smtp_input)
2173 {
2174 int len;
2175 uschar *s = Ustrchr(h->text, ':') + 1;
2176 while (isspace(*s)) s++;
2177 len = h->slen - (s - h->text) - 1;
2178 if (Ustrlen(originator_login) == len &&
2179 strncmpic(s, originator_login, len) == 0)
2180 {
2181 uschar *name = is_resent? US"Resent-From" : US"From";
2182 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2183 originator_login, qualify_domain_sender);
2184 from_header = header_last;
2185 h->type = htype_old;
2186 DEBUG(D_receive|D_rewrite)
2187 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2188 }
2189 }
2190 }
2191 break;
2192
2193 /* Identify the Message-id: header for generating "in-reply-to" in the
2194 autoreply transport. For incoming logging, save any resent- value. In both
2195 cases, take just the first of any multiples. */
2196
2197 case htype_id:
2198 if (msgid_header == NULL && (!resents_exist || is_resent))
2199 {
2200 msgid_header = h;
2201 h->type = htype_id;
2202 }
2203 break;
2204
2205 /* Flag all Received: headers */
2206
2207 case htype_received:
2208 h->type = htype_received;
2209 received_count++;
2210 break;
2211
2212 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2213
2214 case htype_reply_to:
2215 h->type = htype_reply_to;
2216 break;
2217
2218 /* The Return-path: header is supposed to be added to messages when
2219 they leave the SMTP system. We shouldn't receive messages that already
2220 contain Return-path. However, since Exim generates Return-path: on
2221 local delivery, resent messages may well contain it. We therefore
2222 provide an option (which defaults on) to remove any Return-path: headers
2223 on input. Removal actually means flagging as "old", which prevents the
2224 header being transmitted with the message. */
2225
2226 case htype_return_path:
2227 if (return_path_remove) h->type = htype_old;
2228
2229 /* If we are testing a mail filter file, use the value of the
2230 Return-Path: header to set up the return_path variable, which is not
2231 otherwise set. However, remove any <> that surround the address
2232 because the variable doesn't have these. */
2233
2234 if (filter_test != FTEST_NONE)
2235 {
2236 uschar *start = h->text + 12;
2237 uschar *end = start + Ustrlen(start);
2238 while (isspace(*start)) start++;
2239 while (end > start && isspace(end[-1])) end--;
2240 if (*start == '<' && end[-1] == '>')
2241 {
2242 start++;
2243 end--;
2244 }
2245 return_path = string_copyn(start, end - start);
2246 printf("Return-path taken from \"Return-path:\" header line\n");
2247 }
2248 break;
2249
2250 /* If there is a "Sender:" header and the message is locally originated,
2251 and from an untrusted caller and suppress_local_fixups is not set, or if we
2252 are in submission mode for a remote message, mark it "old" so that it will
2253 not be transmitted with the message, unless active_local_sender_retain is
2254 set. (This can only be true if active_local_from_check is false.) If there
2255 are any resent- headers in the message, apply this rule to Resent-Sender:
2256 instead of Sender:. Messages with multiple resent- header sets cannot be
2257 tidily handled. (For this reason, at least one MUA - Pine - turns old
2258 resent- headers into X-resent- headers when resending, leaving just one
2259 set.) */
2260
2261 case htype_sender:
2262 h->type = ((!active_local_sender_retain &&
2263 (
2264 (sender_local && !trusted_caller && !suppress_local_fixups)
2265 || submission_mode
2266 )
2267 ) &&
2268 (!resents_exist||is_resent))?
2269 htype_old : htype_sender;
2270 break;
2271
2272 /* Remember the Subject: header for logging. There is no Resent-Subject */
2273
2274 case htype_subject:
2275 subject_header = h;
2276 break;
2277
2278 /* "To:" gets flagged, and the existence of a recipient header is noted,
2279 whether it's resent- or not. */
2280
2281 case htype_to:
2282 h->type = htype_to;
2283 /****
2284 to_or_cc_header_exists = TRUE;
2285 ****/
2286 break;
2287 }
2288 }
2289
2290 /* Extract recipients from the headers if that is required (the -t option).
2291 Note that this is documented as being done *before* any address rewriting takes
2292 place. There are two possibilities:
2293
2294 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2295 recipients already listed are to be REMOVED from the message. Smail 3 works
2296 like this. We need to build a non-recipients tree for that list, because in
2297 subsequent processing this data is held in a tree and that's what the
2298 spool_write_header() function expects. Make sure that non-recipient addresses
2299 are fully qualified and rewritten if necessary.
2300
2301 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2302 those in the command line arguments (and it is rumoured some other MTAs do
2303 this). Therefore, there is an option to make Exim behave this way.
2304
2305 *** Notes on "Resent-" header lines ***
2306
2307 The presence of resent-headers in the message makes -t horribly ambiguous.
2308 Experiments with sendmail showed that it uses recipients for all resent-
2309 headers, totally ignoring the concept of "sets of resent- headers" as described
2310 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2311 with all the addresses in one instance of each header.
2312
2313 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2314 error for -t if there were resent- headers in the message. However, after a
2315 discussion on the mailing list, I've learned that there are MUAs that use
2316 resent- headers with -t, and also that the stuff about sets of resent- headers
2317 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2318 message with -t and resent- header lines makes sure that only *its* resent-
2319 headers are present; previous ones are often renamed as X-resent- for example.
2320
2321 Consequently, Exim has been changed so that, if any resent- header lines are
2322 present, the recipients are taken from all of the appropriate resent- lines,
2323 and not from the ordinary To:, Cc:, etc. */
2324
2325 if (extract_recip)
2326 {
2327 int rcount = 0;
2328 error_block **bnext = &bad_addresses;
2329
2330 if (extract_addresses_remove_arguments)
2331 {
2332 while (recipients_count-- > 0)
2333 {
2334 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2335 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2336 tree_add_nonrecipient(s);
2337 }
2338 recipients_list = NULL;
2339 recipients_count = recipients_list_max = 0;
2340 }
2341
2342 /* Now scan the headers */
2343
2344 for (h = header_list->next; h != NULL; h = h->next)
2345 {
2346 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2347 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2348 {
2349 uschar *s = Ustrchr(h->text, ':') + 1;
2350 while (isspace(*s)) s++;
2351
2352 parse_allow_group = TRUE; /* Allow address group syntax */
2353
2354 while (*s != 0)
2355 {
2356 uschar *ss = parse_find_address_end(s, FALSE);
2357 uschar *recipient, *errmess, *p, *pp;
2358 int start, end, domain;
2359
2360 /* Check on maximum */
2361
2362 if (recipients_max > 0 && ++rcount > recipients_max)
2363 {
2364 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2365 US"message rejected: ", error_rc, stdin, NULL);
2366 /* Does not return */
2367 }
2368
2369 /* Make a copy of the address, and remove any internal newlines. These
2370 may be present as a result of continuations of the header line. The
2371 white space that follows the newline must not be removed - it is part
2372 of the header. */
2373
2374 pp = recipient = store_get(ss - s + 1);
2375 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2376 *pp = 0;
2377
2378 #ifdef SUPPORT_I18N
2379 {
2380 BOOL b = allow_utf8_domains;
2381 allow_utf8_domains = TRUE;
2382 #endif
2383 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2384 &domain, FALSE);
2385
2386 #ifdef SUPPORT_I18N
2387 if (string_is_utf8(recipient))
2388 message_smtputf8 = TRUE;
2389 else
2390 allow_utf8_domains = b;
2391 }
2392 #endif
2393
2394 /* Keep a list of all the bad addresses so we can send a single
2395 error message at the end. However, an empty address is not an error;
2396 just ignore it. This can come from an empty group list like
2397
2398 To: Recipients of list:;
2399
2400 If there are no recipients at all, an error will occur later. */
2401
2402 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2403 {
2404 int len = Ustrlen(s);
2405 error_block *b = store_get(sizeof(error_block));
2406 while (len > 0 && isspace(s[len-1])) len--;
2407 b->next = NULL;
2408 b->text1 = string_printing(string_copyn(s, len));
2409 b->text2 = errmess;
2410 *bnext = b;
2411 bnext = &(b->next);
2412 }
2413
2414 /* If the recipient is already in the nonrecipients tree, it must
2415 have appeared on the command line with the option extract_addresses_
2416 remove_arguments set. Do not add it to the recipients, and keep a note
2417 that this has happened, in order to give a better error if there are
2418 no recipients left. */
2419
2420 else if (recipient != NULL)
2421 {
2422 if (tree_search(tree_nonrecipients, recipient) == NULL)
2423 receive_add_recipient(recipient, -1);
2424 else
2425 extracted_ignored = TRUE;
2426 }
2427
2428 /* Move on past this address */
2429
2430 s = ss + (*ss? 1:0);
2431 while (isspace(*s)) s++;
2432 } /* Next address */
2433
2434 parse_allow_group = FALSE; /* Reset group syntax flags */
2435 parse_found_group = FALSE;
2436
2437 /* If this was the bcc: header, mark it "old", which means it
2438 will be kept on the spool, but not transmitted as part of the
2439 message. */
2440
2441 if (h->type == htype_bcc) h->type = htype_old;
2442 } /* For appropriate header line */
2443 } /* For each header line */
2444
2445 }
2446
2447 /* Now build the unique message id. This has changed several times over the
2448 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2449 Retaining all the history in the comment has become too unwieldy - read
2450 previous release sources if you want it.
2451
2452 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2453 The first part is the current time, in seconds. The second part is the current
2454 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2455 can hold a number in the range 0-3843. It used to be a computed sequence
2456 number, but is now the fractional component of the current time in units of
2457 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2458 received, Exim ensures that the timer has ticked at the appropriate level
2459 before proceeding, to avoid duplication if the pid happened to be re-used
2460 within the same time period. It seems likely that most messages will take at
2461 least half a millisecond to be received, so no delay will normally be
2462 necessary. At least for some time...
2463
2464 There is a modification when localhost_number is set. Formerly this was allowed
2465 to be as large as 255. Now it is restricted to the range 0-16, and the final
2466 component of the message id becomes (localhost_number * 200) + fractional time
2467 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2468
2469 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2470 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2471 still allows the tttttt field to hold a large enough number to last for some
2472 more decades, and the final two-digit field can hold numbers up to 1295, which
2473 is enough for milliseconds (instead of 1/2000 of a second).
2474
2475 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2476 pid, so it is probably safe because pids have to be positive. The
2477 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2478 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2479
2480 Note that string_base62() returns its data in a static storage block, so it
2481 must be copied before calling string_base62() again. It always returns exactly
2482 6 characters.
2483
2484 There doesn't seem to be anything in the RFC which requires a message id to
2485 start with a letter, but Smail was changed to ensure this. The external form of
2486 the message id (as supplied by string expansion) therefore starts with an
2487 additional leading 'E'. The spool file names do not include this leading
2488 letter and it is not used internally.
2489
2490 NOTE: If ever the format of message ids is changed, the regular expression for
2491 checking that a string is in this format must be updated in a corresponding
2492 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2493 must also be changed to reflect the correct string length. Then, of course,
2494 other programs that rely on the message id format will need updating too. */
2495
2496 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2497 message_id[6] = '-';
2498 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2499
2500 /* Deal with the case where the host number is set. The value of the number was
2501 checked when it was read, to ensure it isn't too big. The timing granularity is
2502 left in id_resolution so that an appropriate wait can be done after receiving
2503 the message, if necessary (we hope it won't be). */
2504
2505 if (host_number_string != NULL)
2506 {
2507 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2508 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2509 string_base62((long int)(
2510 host_number * (1000000/id_resolution) +
2511 message_id_tv.tv_usec/id_resolution)) + 4);
2512 }
2513
2514 /* Host number not set: final field is just the fractional time at an
2515 appropriate resolution. */
2516
2517 else
2518 {
2519 id_resolution = (BASE_62 == 62)? 500 : 1000;
2520 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2521 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2522 }
2523
2524 /* Add the current message id onto the current process info string if
2525 it will fit. */
2526
2527 (void)string_format(process_info + process_info_len,
2528 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2529
2530 /* If we are using multiple input directories, set up the one for this message
2531 to be the least significant base-62 digit of the time of arrival. Otherwise
2532 ensure that it is an empty string. */
2533
2534 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2535
2536 /* Now that we have the message-id, if there is no message-id: header, generate
2537 one, but only for local (without suppress_local_fixups) or submission mode
2538 messages. This can be user-configured if required, but we had better flatten
2539 any illegal characters therein. */
2540
2541 if (msgid_header == NULL &&
2542 ((sender_host_address == NULL && !suppress_local_fixups)
2543 || submission_mode))
2544 {
2545 uschar *p;
2546 uschar *id_text = US"";
2547 uschar *id_domain = primary_hostname;
2548
2549 /* Permit only letters, digits, dots, and hyphens in the domain */
2550
2551 if (message_id_domain != NULL)
2552 {
2553 uschar *new_id_domain = expand_string(message_id_domain);
2554 if (new_id_domain == NULL)
2555 {
2556 if (!expand_string_forcedfail)
2557 log_write(0, LOG_MAIN|LOG_PANIC,
2558 "expansion of \"%s\" (message_id_header_domain) "
2559 "failed: %s", message_id_domain, expand_string_message);
2560 }
2561 else if (*new_id_domain != 0)
2562 {
2563 id_domain = new_id_domain;
2564 for (p = id_domain; *p != 0; p++)
2565 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2566 }
2567 }
2568
2569 /* Permit all characters except controls and RFC 2822 specials in the
2570 additional text part. */
2571
2572 if (message_id_text != NULL)
2573 {
2574 uschar *new_id_text = expand_string(message_id_text);
2575 if (new_id_text == NULL)
2576 {
2577 if (!expand_string_forcedfail)
2578 log_write(0, LOG_MAIN|LOG_PANIC,
2579 "expansion of \"%s\" (message_id_header_text) "
2580 "failed: %s", message_id_text, expand_string_message);
2581 }
2582 else if (*new_id_text != 0)
2583 {
2584 id_text = new_id_text;
2585 for (p = id_text; *p != 0; p++)
2586 if (mac_iscntrl_or_special(*p)) *p = '-';
2587 }
2588 }
2589
2590 /* Add the header line
2591 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2592 * appended, to preserve classical expectations of header ordering. */
2593
2594 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2595 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2596 (*id_text == 0)? "" : ".", id_text, id_domain);
2597 }
2598
2599 /* If we are to log recipients, keep a copy of the raw ones before any possible
2600 rewriting. Must copy the count, because later ACLs and the local_scan()
2601 function may mess with the real recipients. */
2602
2603 if (LOGGING(received_recipients))
2604 {
2605 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2606 for (i = 0; i < recipients_count; i++)
2607 raw_recipients[i] = string_copy(recipients_list[i].address);
2608 raw_recipients_count = recipients_count;
2609 }
2610
2611 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2612 recipients will get here only if the conditions were right (allow_unqualified_
2613 recipient is TRUE). */
2614
2615 for (i = 0; i < recipients_count; i++)
2616 recipients_list[i].address =
2617 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2618 global_rewrite_rules, rewrite_existflags);
2619
2620 /* If there is no From: header, generate one for local (without
2621 suppress_local_fixups) or submission_mode messages. If there is no sender
2622 address, but the sender is local or this is a local delivery error, use the
2623 originator login. This shouldn't happen for genuine bounces, but might happen
2624 for autoreplies. The addition of From: must be done *before* checking for the
2625 possible addition of a Sender: header, because untrusted_set_sender allows an
2626 untrusted user to set anything in the envelope (which might then get info
2627 From:) but we still want to ensure a valid Sender: if it is required. */
2628
2629 if (from_header == NULL &&
2630 ((sender_host_address == NULL && !suppress_local_fixups)
2631 || submission_mode))
2632 {
2633 uschar *oname = US"";
2634
2635 /* Use the originator_name if this is a locally submitted message and the
2636 caller is not trusted. For trusted callers, use it only if -F was used to
2637 force its value or if we have a non-SMTP message for which -f was not used
2638 to set the sender. */
2639
2640 if (sender_host_address == NULL)
2641 {
2642 if (!trusted_caller || sender_name_forced ||
2643 (!smtp_input && !sender_address_forced))
2644 oname = originator_name;
2645 }
2646
2647 /* For non-locally submitted messages, the only time we use the originator
2648 name is when it was forced by the /name= option on control=submission. */
2649
2650 else
2651 {
2652 if (submission_name != NULL) oname = submission_name;
2653 }
2654
2655 /* Envelope sender is empty */
2656
2657 if (sender_address[0] == 0)
2658 {
2659 uschar *fromstart, *fromend;
2660
2661 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2662 oname, (oname[0] == 0)? "" : " <");
2663 fromend = (oname[0] == 0)? US"" : US">";
2664
2665 if (sender_local || local_error_message)
2666 {
2667 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2668 local_part_quote(originator_login), qualify_domain_sender,
2669 fromend);
2670 }
2671 else if (submission_mode && authenticated_id != NULL)
2672 {
2673 if (submission_domain == NULL)
2674 {
2675 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2676 local_part_quote(authenticated_id), qualify_domain_sender,
2677 fromend);
2678 }
2679 else if (submission_domain[0] == 0) /* empty => whole address set */
2680 {
2681 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2682 fromend);
2683 }
2684 else
2685 {
2686 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2687 local_part_quote(authenticated_id), submission_domain,
2688 fromend);
2689 }
2690 from_header = header_last; /* To get it checked for Sender: */
2691 }
2692 }
2693
2694 /* There is a non-null envelope sender. Build the header using the original
2695 sender address, before any rewriting that might have been done while
2696 verifying it. */
2697
2698 else
2699 {
2700 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2701 oname,
2702 (oname[0] == 0)? "" : " <",
2703 (sender_address_unrewritten == NULL)?
2704 sender_address : sender_address_unrewritten,
2705 (oname[0] == 0)? "" : ">");
2706
2707 from_header = header_last; /* To get it checked for Sender: */
2708 }
2709 }
2710
2711
2712 /* If the sender is local (without suppress_local_fixups), or if we are in
2713 submission mode and there is an authenticated_id, check that an existing From:
2714 is correct, and if not, generate a Sender: header, unless disabled. Any
2715 previously-existing Sender: header was removed above. Note that sender_local,
2716 as well as being TRUE if the caller of exim is not trusted, is also true if a
2717 trusted caller did not supply a -f argument for non-smtp input. To allow
2718 trusted callers to forge From: without supplying -f, we have to test explicitly
2719 here. If the From: header contains more than one address, then the call to
2720 parse_extract_address fails, and a Sender: header is inserted, as required. */
2721
2722 if (from_header != NULL &&
2723 (active_local_from_check &&
2724 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2725 (submission_mode && authenticated_id != NULL))
2726 ))
2727 {
2728 BOOL make_sender = TRUE;
2729 int start, end, domain;
2730 uschar *errmess;
2731 uschar *from_address =
2732 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2733 &start, &end, &domain, FALSE);
2734 uschar *generated_sender_address;
2735
2736 if (submission_mode)
2737 {
2738 if (submission_domain == NULL)
2739 {
2740 generated_sender_address = string_sprintf("%s@%s",
2741 local_part_quote(authenticated_id), qualify_domain_sender);
2742 }
2743 else if (submission_domain[0] == 0) /* empty => full address */
2744 {
2745 generated_sender_address = string_sprintf("%s",
2746 authenticated_id);
2747 }
2748 else
2749 {
2750 generated_sender_address = string_sprintf("%s@%s",
2751 local_part_quote(authenticated_id), submission_domain);
2752 }
2753 }
2754 else
2755 generated_sender_address = string_sprintf("%s@%s",
2756 local_part_quote(originator_login), qualify_domain_sender);
2757
2758 /* Remove permitted prefixes and suffixes from the local part of the From:
2759 address before doing the comparison with the generated sender. */
2760
2761 if (from_address != NULL)
2762 {
2763 int slen;
2764 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2765
2766 if (at != NULL) *at = 0;
2767 from_address += route_check_prefix(from_address, local_from_prefix);
2768 slen = route_check_suffix(from_address, local_from_suffix);
2769 if (slen > 0)
2770 {
2771 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2772 from_address += slen;
2773 }
2774 if (at != NULL) *at = '@';
2775
2776 if (strcmpic(generated_sender_address, from_address) == 0 ||
2777 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2778 make_sender = FALSE;
2779 }
2780
2781 /* We have to cause the Sender header to be rewritten if there are
2782 appropriate rewriting rules. */
2783
2784 if (make_sender)
2785 {
2786 if (submission_mode && submission_name == NULL)
2787 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2788 generated_sender_address);
2789 else
2790 header_add(htype_sender, "%sSender: %s <%s>\n",
2791 resent_prefix,
2792 submission_mode? submission_name : originator_name,
2793 generated_sender_address);
2794 }
2795
2796 /* Ensure that a non-null envelope sender address corresponds to the
2797 submission mode sender address. */
2798
2799 if (submission_mode && sender_address[0] != 0)
2800 {
2801 if (sender_address_unrewritten == NULL)
2802 sender_address_unrewritten = sender_address;
2803 sender_address = generated_sender_address;
2804 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2805 log_write(L_address_rewrite, LOG_MAIN,
2806 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2807 sender_address_unrewritten, generated_sender_address);
2808 }
2809 }
2810
2811 /* If there are any rewriting rules, apply them to the sender address, unless
2812 it has already been rewritten as part of verification for SMTP input. */
2813
2814 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2815 sender_address[0] != 0)
2816 {
2817 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2818 global_rewrite_rules, rewrite_existflags);
2819 DEBUG(D_receive|D_rewrite)
2820 debug_printf("rewritten sender = %s\n", sender_address);
2821 }
2822
2823
2824 /* The headers must be run through rewrite_header(), because it ensures that
2825 addresses are fully qualified, as well as applying any rewriting rules that may
2826 exist.
2827
2828 Qualification of header addresses in a message from a remote host happens only
2829 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2830 appropriate. For local messages, qualification always happens, unless -bnq is
2831 used to explicitly suppress it. No rewriting is done for an unqualified address
2832 that is left untouched.
2833
2834 We start at the second header, skipping our own Received:. This rewriting is
2835 documented as happening *after* recipient addresses are taken from the headers
2836 by the -t command line option. An added Sender: gets rewritten here. */
2837
2838 for (h = header_list->next; h != NULL; h = h->next)
2839 {
2840 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2841 rewrite_existflags, TRUE);
2842 if (newh != NULL) h = newh;
2843 }
2844
2845
2846 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2847 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2848 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2849 exists, this applies to the set of resent- headers rather than the normal set.
2850
2851 The requirement for a recipient header has been removed in RFC 2822. At this
2852 point in the code, earlier versions of Exim added a To: header for locally
2853 submitted messages, and an empty Bcc: header for others. In the light of the
2854 changes in RFC 2822, this was dropped in November 2003. */
2855
2856
2857 /* If there is no date header, generate one if the message originates locally
2858 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2859 submission mode flag is set. Messages without Date: are not valid, but it seems
2860 to be more confusing if Exim adds one to all remotely-originated messages.
2861 As per Message-Id, we prepend if resending, else append.
2862 */
2863
2864 if (!date_header_exists &&
2865 ((sender_host_address == NULL && !suppress_local_fixups)
2866 || submission_mode))
2867 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2868 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2869
2870 search_tidyup(); /* Free any cached resources */
2871
2872 /* Show the complete set of headers if debugging. Note that the first one (the
2873 new Received:) has not yet been set. */
2874
2875 DEBUG(D_receive)
2876 {
2877 debug_printf(">>Headers after rewriting and local additions:\n");
2878 for (h = header_list->next; h != NULL; h = h->next)
2879 debug_printf("%c %s", h->type, h->text);
2880 debug_printf("\n");
2881 }
2882
2883 /* The headers are now complete in store. If we are running in filter
2884 testing mode, that is all this function does. Return TRUE if the message
2885 ended with a dot. */
2886
2887 if (filter_test != FTEST_NONE)
2888 {
2889 process_info[process_info_len] = 0;
2890 return message_ended == END_DOT;
2891 }
2892
2893 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2894 think more if it could be handled. Cannot do onward CHUNKING unless
2895 inbound is, but inbound chunking ought to be ok with outbound plain.
2896 Could we do onward CHUNKING given inbound CHUNKING?
2897 */
2898 if (chunking_state > CHUNKING_OFFERED)
2899 cancel_cutthrough_connection("chunking active");
2900
2901 /* Cutthrough delivery:
2902 We have to create the Received header now rather than at the end of reception,
2903 so the timestamp behaviour is a change to the normal case.
2904 XXX Ensure this gets documented XXX.
2905 Having created it, send the headers to the destination. */
2906 if (cutthrough.fd >= 0)
2907 {
2908 if (received_count > received_headers_max)
2909 {
2910 cancel_cutthrough_connection("too many headers");
2911 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2912 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2913 "Too many \"Received\" headers",
2914 sender_address,
2915 (sender_fullhost == NULL)? "" : " H=",
2916 (sender_fullhost == NULL)? US"" : sender_fullhost,
2917 (sender_ident == NULL)? "" : " U=",
2918 (sender_ident == NULL)? US"" : sender_ident);
2919 message_id[0] = 0; /* Indicate no message accepted */
2920 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2921 goto TIDYUP; /* Skip to end of function */
2922 }
2923 received_header_gen();
2924 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2925 (void) cutthrough_headers_send();
2926 }
2927
2928
2929 /* Open a new spool file for the data portion of the message. We need
2930 to access it both via a file descriptor and a stream. Try to make the
2931 directory if it isn't there. */
2932
2933 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
2934 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
2935
2936 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
2937 {
2938 if (errno == ENOENT)
2939 {
2940 (void) directory_make(spool_directory,
2941 spool_sname(US"input", message_subdir),
2942 INPUT_DIRECTORY_MODE, TRUE);
2943 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2944 }
2945 if (data_fd < 0)
2946 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2947 spool_name, strerror(errno));
2948 }
2949
2950 /* Make sure the file's group is the Exim gid, and double-check the mode
2951 because the group setting doesn't always get set automatically. */
2952
2953 if (fchown(data_fd, exim_uid, exim_gid))
2954 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2955 "Failed setting ownership on spool file %s: %s",
2956 spool_name, strerror(errno));
2957 (void)fchmod(data_fd, SPOOL_MODE);
2958
2959 /* We now have data file open. Build a stream for it and lock it. We lock only
2960 the first line of the file (containing the message ID) because otherwise there
2961 are problems when Exim is run under Cygwin (I'm told). See comments in
2962 spool_in.c, where the same locking is done. */
2963
2964 data_file = fdopen(data_fd, "w+");
2965 lock_data.l_type = F_WRLCK;
2966 lock_data.l_whence = SEEK_SET;
2967 lock_data.l_start = 0;
2968 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2969
2970 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2971 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2972 errno, strerror(errno));
2973
2974 /* We have an open, locked data file. Write the message id to it to make it
2975 self-identifying. Then read the remainder of the input of this message and
2976 write it to the data file. If the variable next != NULL, it contains the first
2977 data line (which was read as a header but then turned out not to have the right
2978 format); write it (remembering that it might contain binary zeros). The result
2979 of fwrite() isn't inspected; instead we call ferror() below. */
2980
2981 fprintf(data_file, "%s-D\n", message_id);
2982 if (next != NULL)
2983 {
2984 uschar *s = next->text;
2985 int len = next->slen;
2986 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2987 body_linecount++; /* Assumes only 1 line */
2988 }
2989
2990 /* Note that we might already be at end of file, or the logical end of file
2991 (indicated by '.'), or might have encountered an error while writing the
2992 message id or "next" line. */
2993
2994 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2995 {
2996 if (smtp_input)
2997 {
2998 message_ended = chunking_state > CHUNKING_OFFERED
2999 ? read_message_bdat_smtp(data_file)
3000 : read_message_data_smtp(data_file);
3001 receive_linecount++; /* The terminating "." line */
3002 }
3003 else message_ended = read_message_data(data_file);
3004
3005 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3006 message_linecount += body_linecount;
3007
3008 switch (message_ended)
3009 {
3010 /* Handle premature termination of SMTP */
3011
3012 case END_EOF:
3013 if (smtp_input)
3014 {
3015 Uunlink(spool_name); /* Lose data file when closed */
3016 cancel_cutthrough_connection("sender closed connection");
3017 message_id[0] = 0; /* Indicate no message accepted */
3018 smtp_reply = handle_lost_connection(US"");
3019 smtp_yield = FALSE;
3020 goto TIDYUP; /* Skip to end of function */
3021 }
3022 break;
3023
3024 /* Handle message that is too big. Don't use host_or_ident() in the log
3025 message; we want to see the ident value even for non-remote messages. */
3026
3027 case END_SIZE:
3028 Uunlink(spool_name); /* Lose the data file when closed */
3029 cancel_cutthrough_connection("mail too big");
3030 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3031
3032 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3033 "message too big: read=%d max=%d",
3034 sender_address,
3035 (sender_fullhost == NULL)? "" : " H=",
3036 (sender_fullhost == NULL)? US"" : sender_fullhost,
3037 (sender_ident == NULL)? "" : " U=",
3038 (sender_ident == NULL)? US"" : sender_ident,
3039 message_size,
3040 thismessage_size_limit);
3041
3042 if (smtp_input)
3043 {
3044 smtp_reply = US"552 Message size exceeds maximum permitted";
3045 message_id[0] = 0; /* Indicate no message accepted */
3046 goto TIDYUP; /* Skip to end of function */
3047 }
3048 else
3049 {
3050 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3051 give_local_error(ERRMESS_TOOBIG,
3052 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3053 US"message rejected: ", error_rc, data_file, header_list);
3054 /* Does not return */
3055 }
3056 break;
3057
3058 /* Handle bad BDAT protocol sequence */
3059
3060 case END_PROTOCOL:
3061 Uunlink(spool_name); /* Lose the data file when closed */
3062 cancel_cutthrough_connection("sender protocol error");
3063 smtp_reply = US""; /* Response already sent */
3064 message_id[0] = 0; /* Indicate no message accepted */
3065 goto TIDYUP; /* Skip to end of function */
3066 }
3067 }
3068
3069 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3070 example, there may be some expansion in an ACL that uses a timer.) */
3071
3072 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3073
3074 /* The message body has now been read into the data file. Call fflush() to
3075 empty the buffers in C, and then call fsync() to get the data written out onto
3076 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3077 having to do this). If there was an I/O error on either input or output,
3078 attempt to send an error message, and unlink the spool file. For non-SMTP input
3079 we can then give up. Note that for SMTP input we must swallow the remainder of
3080 the input in cases of output errors, since the far end doesn't expect to see
3081 anything until the terminating dot line is sent. */
3082
3083 if (fflush(data_file) == EOF || ferror(data_file) ||
3084 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3085 {
3086 uschar *msg_errno = US strerror(errno);
3087 BOOL input_error = (receive_ferror)() != 0;
3088 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3089 input_error? "Input read" : "Spool write",
3090 msg_errno,
3091 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3092
3093 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3094 Uunlink(spool_name); /* Lose the data file */
3095 cancel_cutthrough_connection("error writing spoolfile");
3096
3097 if (smtp_input)
3098 {
3099 if (input_error)
3100 smtp_reply = US"451 Error while reading input data";
3101 else
3102 {
3103 smtp_reply = US"451 Error while writing spool file";
3104 receive_swallow_smtp();
3105 }
3106 message_id[0] = 0; /* Indicate no message accepted */
3107 goto TIDYUP; /* Skip to end of function */
3108 }
3109
3110 else
3111 {
3112 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3113 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3114 header_list);
3115 /* Does not return */
3116 }
3117 }
3118
3119
3120 /* No I/O errors were encountered while writing the data file. */
3121
3122 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3123
3124
3125 /* If there were any bad addresses extracted by -t, or there were no recipients
3126 left after -t, send a message to the sender of this message, or write it to
3127 stderr if the error handling option is set that way. Note that there may
3128 legitimately be no recipients for an SMTP message if they have all been removed
3129 by "discard".
3130
3131 We need to rewind the data file in order to read it. In the case of no
3132 recipients or stderr error writing, throw the data file away afterwards, and
3133 exit. (This can't be SMTP, which always ensures there's at least one
3134 syntactically good recipient address.) */
3135
3136 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3137 {
3138 DEBUG(D_receive)
3139 {
3140 if (recipients_count == 0) debug_printf("*** No recipients\n");
3141 if (bad_addresses != NULL)
3142 {
3143 error_block *eblock = bad_addresses;
3144 debug_printf("*** Bad address(es)\n");
3145 while (eblock != NULL)
3146 {
3147 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3148 eblock = eblock->next;
3149 }
3150 }
3151 }
3152
3153 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3154
3155 /* If configured to send errors to the sender, but this fails, force
3156 a failure error code. We use a special one for no recipients so that it
3157 can be detected by the autoreply transport. Otherwise error_rc is set to
3158 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3159 it is EXIT_SUCCESS. */
3160
3161 if (error_handling == ERRORS_SENDER)
3162 {
3163 if (!moan_to_sender(
3164 (bad_addresses == NULL)?
3165 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3166 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3167 bad_addresses, header_list, data_file, FALSE))
3168 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3169 }
3170 else
3171 {
3172 if (bad_addresses == NULL)
3173 {
3174 if (extracted_ignored)
3175 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3176 else
3177 fprintf(stderr, "exim: no recipients in message\n");
3178 }
3179 else
3180 {
3181 fprintf(stderr, "exim: invalid address%s",
3182 (bad_addresses->next == NULL)? ":" : "es:\n");
3183 while (bad_addresses != NULL)
3184 {
3185 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3186 bad_addresses->text2);
3187 bad_addresses = bad_addresses->next;
3188 }
3189 }
3190 }
3191
3192 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3193 {
3194 Uunlink(spool_name);
3195 (void)fclose(data_file);
3196 exim_exit(error_rc);
3197 }
3198 }
3199
3200 /* Data file successfully written. Generate text for the Received: header by
3201 expanding the configured string, and adding a timestamp. By leaving this
3202 operation till now, we ensure that the timestamp is the time that message
3203 reception was completed. However, this is deliberately done before calling the
3204 data ACL and local_scan().
3205
3206 This Received: header may therefore be inspected by the data ACL and by code in
3207 the local_scan() function. When they have run, we update the timestamp to be
3208 the final time of reception.
3209
3210 If there is just one recipient, set up its value in the $received_for variable
3211 for use when we generate the Received: header.
3212
3213 Note: the checking for too many Received: headers is handled by the delivery
3214 code. */
3215 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3216
3217 if (received_header->text == NULL) /* Non-cutthrough case */
3218 {
3219 received_header_gen();
3220
3221 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3222
3223 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3224 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3225
3226 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3227 now, before running the DATA ACL. */
3228
3229 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3230 }
3231 else
3232 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3233 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3234
3235 /* If an ACL is specified for checking things at this stage of reception of a
3236 message, run it, unless all the recipients were removed by "discard" in earlier
3237 ACLs. That is the only case in which recipients_count can be zero at this
3238 stage. Set deliver_datafile to point to the data file so that $message_body and
3239 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3240 */
3241
3242 deliver_datafile = data_fd;
3243 user_msg = NULL;
3244
3245 enable_dollar_recipients = TRUE;
3246
3247 if (recipients_count == 0)
3248 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3249
3250 else
3251 {
3252 /* Handle interactive SMTP messages */
3253
3254 if (smtp_input && !smtp_batched_input)
3255 {
3256
3257 #ifndef DISABLE_DKIM
3258 if (!dkim_disable_verify)
3259 {
3260 /* Finish verification, this will log individual signature results to
3261 the mainlog */
3262 dkim_exim_verify_finish();
3263
3264 /* Check if we must run the DKIM ACL */
3265 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3266 {
3267 uschar *dkim_verify_signers_expanded =
3268 expand_string(dkim_verify_signers);
3269 if (!dkim_verify_signers_expanded)
3270 log_write(0, LOG_MAIN|LOG_PANIC,
3271 "expansion of dkim_verify_signers option failed: %s",
3272 expand_string_message);
3273
3274 else
3275 {
3276 int sep = 0;
3277 const uschar *ptr = dkim_verify_signers_expanded;
3278 uschar *item = NULL;
3279 uschar *seen_items = NULL;
3280 int seen_items_size = 0;
3281 int seen_items_offset = 0;
3282 /* Default to OK when no items are present */
3283 rc = OK;
3284 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3285 {
3286 /* Prevent running ACL for an empty item */
3287 if (!item || !*item) continue;
3288
3289 /* Only run ACL once for each domain or identity,
3290 no matter how often it appears in the expanded list. */
3291 if (seen_items)
3292 {
3293 uschar *seen_item = NULL;
3294 const uschar *seen_items_list = seen_items;
3295 BOOL seen_this_item = FALSE;
3296
3297 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3298 NULL, 0)))
3299 if (Ustrcmp(seen_item,item) == 0)
3300 {
3301 seen_this_item = TRUE;
3302 break;
3303 }
3304
3305 if (seen_this_item)
3306 {
3307 DEBUG(D_receive)
3308 debug_printf("acl_smtp_dkim: skipping signer %s, "
3309 "already seen\n", item);
3310 continue;
3311 }
3312
3313 seen_items = string_append(seen_items, &seen_items_size,
3314 &seen_items_offset, 1, ":");
3315 }
3316
3317 seen_items = string_append(seen_items, &seen_items_size,
3318 &seen_items_offset, 1, item);
3319 seen_items[seen_items_offset] = '\0';
3320
3321 DEBUG(D_receive)
3322 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3323 item);
3324
3325 dkim_exim_acl_setup(item);
3326 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3327 &user_msg, &log_msg);
3328
3329 if (rc != OK)
3330 {
3331 DEBUG(D_receive)
3332 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3333 "skipping remaining items\n", rc, item);
3334 cancel_cutthrough_connection("dkim acl not ok");
3335 break;
3336 }
3337 }
3338 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3339 if (rc == DISCARD)
3340 {
3341 recipients_count = 0;
3342 blackholed_by = US"DKIM ACL";
3343 if (log_msg != NULL)
3344 blackhole_log_msg = string_sprintf(": %s", log_msg);
3345 }
3346 else if (rc != OK)
3347 {
3348 Uunlink(spool_name);
3349 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3350 smtp_yield = FALSE; /* No more messages after dropped connection */
3351 smtp_reply = US""; /* Indicate reply already sent */
3352 message_id[0] = 0; /* Indicate no message accepted */
3353 goto TIDYUP; /* Skip to end of function */
3354 }
3355 }
3356 }
3357 }
3358 #endif /* DISABLE_DKIM */
3359
3360 #ifdef WITH_CONTENT_SCAN
3361 if (recipients_count > 0 &&
3362 acl_smtp_mime != NULL &&
3363 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3364 goto TIDYUP;
3365 #endif /* WITH_CONTENT_SCAN */
3366
3367 #ifdef EXPERIMENTAL_DMARC
3368 dmarc_up = dmarc_store_data(from_header);
3369 #endif /* EXPERIMENTAL_DMARC */
3370
3371 #ifndef DISABLE_PRDR
3372 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3373 {
3374 unsigned int c;
3375 int all_pass = OK;
3376 int all_fail = FAIL;
3377
3378 smtp_printf("353 PRDR content analysis beginning\r\n");
3379 /* Loop through recipients, responses must be in same order received */
3380 for (c = 0; recipients_count > c; c++)
3381 {
3382 uschar * addr= recipients_list[c].address;
3383 uschar * msg= US"PRDR R=<%s> %s";
3384 uschar * code;
3385 DEBUG(D_receive)
3386 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3387 addr, c+1, recipients_count);
3388 rc = acl_check(ACL_WHERE_PRDR, addr,
3389 acl_smtp_data_prdr, &user_msg, &log_msg);
3390
3391 /* If any recipient rejected content, indicate it in final message */
3392 all_pass |= rc;
3393 /* If all recipients rejected, indicate in final message */
3394 all_fail &= rc;
3395
3396 switch (rc)
3397 {
3398 case OK: case DISCARD: code = US"250"; break;
3399 case DEFER: code = US"450"; break;
3400 default: code = US"550"; break;
3401 }
3402 if (user_msg != NULL)
3403 smtp_user_msg(code, user_msg);
3404 else
3405 {
3406 switch (rc)
3407 {
3408 case OK: case DISCARD:
3409 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3410 case DEFER:
3411 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3412 default:
3413 msg = string_sprintf(CS msg, addr, "refusal"); break;
3414 }
3415 smtp_user_msg(code, msg);
3416 }
3417 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3418 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3419 else log_write(0, LOG_MAIN, "%s", CS msg);
3420
3421 if (rc != OK) { receive_remove_recipient(addr); c--; }
3422 }
3423 /* Set up final message, used if data acl gives OK */
3424 smtp_reply = string_sprintf("%s id=%s message %s",
3425 all_fail == FAIL ? US"550" : US"250",
3426 message_id,
3427 all_fail == FAIL
3428 ? US"rejected for all recipients"
3429 : all_pass == OK
3430 ? US"accepted"
3431 : US"accepted for some recipients");
3432 if (recipients_count == 0)
3433 {
3434 message_id[0] = 0; /* Indicate no message accepted */
3435 goto TIDYUP;
3436 }
3437 }
3438 else
3439 prdr_requested = FALSE;
3440 #endif /* !DISABLE_PRDR */
3441
3442 /* Check the recipients count again, as the MIME ACL might have changed
3443 them. */
3444
3445 if (acl_smtp_data != NULL && recipients_count > 0)
3446 {
3447 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3448 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3449 if (rc == DISCARD)
3450 {
3451 recipients_count = 0;
3452 blackholed_by = US"DATA ACL";
3453 if (log_msg != NULL)
3454 blackhole_log_msg = string_sprintf(": %s", log_msg);
3455 cancel_cutthrough_connection("data acl discard");
3456 }
3457 else if (rc != OK)
3458 {
3459 Uunlink(spool_name);
3460 cancel_cutthrough_connection("data acl not ok");
3461 #ifdef WITH_CONTENT_SCAN
3462 unspool_mbox();
3463 #endif
3464 #ifdef EXPERIMENTAL_DCC
3465 dcc_ok = 0;
3466 #endif
3467 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3468 smtp_yield = FALSE; /* No more messages after dropped connection */
3469 smtp_reply = US""; /* Indicate reply already sent */
3470 message_id[0] = 0; /* Indicate no message accepted */
3471 goto TIDYUP; /* Skip to end of function */
3472 }
3473 }
3474 }
3475
3476 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3477 we cannot take different actions for permanent and temporary rejections. */
3478
3479 else
3480 {
3481
3482 #ifdef WITH_CONTENT_SCAN
3483 if (acl_not_smtp_mime != NULL &&
3484 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3485 &blackholed_by))
3486 goto TIDYUP;
3487 #endif /* WITH_CONTENT_SCAN */
3488
3489 if (acl_not_smtp != NULL)
3490 {
3491 uschar *user_msg, *log_msg;
3492 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3493 if (rc == DISCARD)
3494 {
3495 recipients_count = 0;
3496 blackholed_by = US"non-SMTP ACL";
3497 if (log_msg != NULL)
3498 blackhole_log_msg = string_sprintf(": %s", log_msg);
3499 }