MIME ACL: fix SMTP response for non-accept result of the ACL. Bug 2214.
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
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 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
29
30
31 /*************************************************
32 * Non-SMTP character reading functions *
33 *************************************************/
34
35 /* These are the default functions that are set up in the variables such as
36 receive_getc initially. They just call the standard functions, passing stdin as
37 the file. (When SMTP input is occurring, different functions are used by
38 changing the pointer variables.) */
39
40 int
41 stdin_getc(unsigned lim)
42 {
43 return getc(stdin);
44 }
45
46 int
47 stdin_ungetc(int c)
48 {
49 return ungetc(c, stdin);
50 }
51
52 int
53 stdin_feof(void)
54 {
55 return feof(stdin);
56 }
57
58 int
59 stdin_ferror(void)
60 {
61 return ferror(stdin);
62 }
63
64
65
66
67 /*************************************************
68 * Check that a set sender is allowed *
69 *************************************************/
70
71 /* This function is called when a local caller sets an explicit sender address.
72 It checks whether this is permitted, which it is for trusted callers.
73 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74
75 Arguments: the proposed sender address
76 Returns: TRUE for a trusted caller
77 TRUE if the address has been set, untrusted_set_sender has been
78 set, and the address matches something in the list
79 FALSE otherwise
80 */
81
82 BOOL
83 receive_check_set_sender(uschar *newsender)
84 {
85 uschar *qnewsender;
86 if (trusted_caller) return TRUE;
87 if (!newsender || !untrusted_set_sender) return FALSE;
88 qnewsender = Ustrchr(newsender, '@')
89 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
91 }
92
93
94
95
96 /*************************************************
97 * Read space info for a partition *
98 *************************************************/
99
100 /* This function is called by receive_check_fs() below, and also by string
101 expansion for variables such as $spool_space. The field names for the statvfs
102 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
103 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
104 have inodes, and they return -1 for the number available.
105
106 Later: It turns out that some file systems that do not have the concept of
107 inodes return 0 rather than -1. Such systems should also return 0 for the total
108 number of inodes, so we require that to be greater than zero before returning
109 an inode count.
110
111 Arguments:
112 isspool TRUE for spool partition, FALSE for log partition
113 inodeptr address of int to receive inode count; -1 if there isn't one
114
115 Returns: available on-root space, in kilobytes
116 -1 for log partition if there isn't one
117
118 All values are -1 if the STATFS functions are not available.
119 */
120
121 int
122 receive_statvfs(BOOL isspool, int *inodeptr)
123 {
124 #ifdef HAVE_STATFS
125 struct STATVFS statbuf;
126 struct stat dummy;
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 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
184 { /* Can happen on first run after installation */
185 *inodeptr = -1;
186 return -1;
187 }
188 else
189 {
190 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
191 "%s directory %s: %s", name, path, strerror(errno));
192 smtp_closedown(US"spool or log directory problem");
193 exim_exit(EXIT_FAILURE, NULL);
194 }
195
196 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
197
198 /* Disks are getting huge. Take care with computing the size in kilobytes. */
199
200 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
201
202 #else
203 /* Unable to find partition sizes in this environment. */
204
205 *inodeptr = -1;
206 return -1;
207 #endif
208 }
209
210
211
212
213 /*************************************************
214 * Check space on spool and log partitions *
215 *************************************************/
216
217 /* This function is called before accepting a message; if any thresholds are
218 set, it checks them. If a message_size is supplied, it checks that there is
219 enough space for that size plus the threshold - i.e. that the message won't
220 reduce the space to the threshold. Not all OS have statvfs(); for those that
221 don't, this function always returns TRUE. For some OS the old function and
222 struct name statfs is used; that is handled by a macro, defined in exim.h.
223
224 Arguments:
225 msg_size the (estimated) size of an incoming message
226
227 Returns: FALSE if there isn't enough space, or if the information cannot
228 be obtained
229 TRUE if no check was done or there is enough space
230 */
231
232 BOOL
233 receive_check_fs(int msg_size)
234 {
235 int space, inodes;
236
237 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
238 {
239 space = receive_statvfs(TRUE, &inodes);
240
241 DEBUG(D_receive)
242 debug_printf("spool directory space = %dK inodes = %d "
243 "check_space = %dK inodes = %d msg_size = %d\n",
244 space, inodes, check_spool_space, check_spool_inodes, msg_size);
245
246 if ((space >= 0 && space < check_spool_space) ||
247 (inodes >= 0 && inodes < check_spool_inodes))
248 {
249 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
250 "inodes=%d", space, inodes);
251 return FALSE;
252 }
253 }
254
255 if (check_log_space > 0 || check_log_inodes > 0)
256 {
257 space = receive_statvfs(FALSE, &inodes);
258
259 DEBUG(D_receive)
260 debug_printf("log directory space = %dK inodes = %d "
261 "check_space = %dK inodes = %d\n",
262 space, inodes, check_log_space, check_log_inodes);
263
264 if ((space >= 0 && space < check_log_space) ||
265 (inodes >= 0 && inodes < check_log_inodes))
266 {
267 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
268 "inodes=%d", space, inodes);
269 return FALSE;
270 }
271 }
272
273 return TRUE;
274 }
275
276
277
278 /*************************************************
279 * Bomb out while reading a message *
280 *************************************************/
281
282 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
283 received, or if there is a timeout. A rarer case might be if the log files are
284 screwed up and Exim can't open them to record a message's arrival. Handling
285 that case is done by setting a flag to cause the log functions to call this
286 function if there is an ultimate disaster. That is why it is globally
287 accessible.
288
289 Arguments:
290 reason text reason to pass to the not-quit ACL
291 msg default SMTP response to give if in an SMTP session
292 Returns: it doesn't
293 */
294
295 void
296 receive_bomb_out(uschar *reason, uschar *msg)
297 {
298 static BOOL already_bombing_out;
299 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
300 timeouts, if someone has something slow in their quit ACL. Since the only
301 things we should be doing are to close down cleanly ASAP, on the second
302 pass we also close down stuff that might be opened again, before bypassing
303 the ACL call and exiting. */
304
305 /* If spool_name is set, it contains the name of the data file that is being
306 written. Unlink it before closing so that it cannot be picked up by a delivery
307 process. Ensure that any header file is also removed. */
308
309 if (spool_name[0] != '\0')
310 {
311 Uunlink(spool_name);
312 spool_name[Ustrlen(spool_name) - 1] = 'H';
313 Uunlink(spool_name);
314 spool_name[0] = '\0';
315 }
316
317 /* Now close the file if it is open, either as a fd or a stream. */
318
319 if (data_file != NULL)
320 {
321 (void)fclose(data_file);
322 data_file = NULL;
323 } else if (data_fd >= 0) {
324 (void)close(data_fd);
325 data_fd = -1;
326 }
327
328 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
329 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
330 SMTP response. */
331
332 if (!already_bombing_out)
333 {
334 already_bombing_out = TRUE;
335 if (smtp_input)
336 {
337 if (smtp_batched_input)
338 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
339 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
340 smtp_active_hostname, msg);
341 }
342 }
343
344 /* Exit from the program (non-BSMTP cases) */
345
346 exim_exit(EXIT_FAILURE, NULL);
347 }
348
349
350 /*************************************************
351 * Data read timeout *
352 *************************************************/
353
354 /* Handler function for timeouts that occur while reading the data that
355 comprises a message.
356
357 Argument: the signal number
358 Returns: nothing
359 */
360
361 static void
362 data_timeout_handler(int sig)
363 {
364 uschar *msg = NULL;
365
366 sig = sig; /* Keep picky compilers happy */
367
368 if (smtp_input)
369 {
370 msg = US"SMTP incoming data timeout";
371 log_write(L_lost_incoming_connection,
372 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
373 "from %s F=<%s>",
374 (sender_fullhost != NULL)? sender_fullhost : US"local process",
375 sender_address);
376 }
377 else
378 {
379 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
380 log_write(L_lost_incoming_connection,
381 LOG_MAIN, "timed out while reading local message");
382 }
383
384 receive_bomb_out(US"data-timeout", msg); /* Does not return */
385 }
386
387
388
389 /*************************************************
390 * local_scan() timeout *
391 *************************************************/
392
393 /* Handler function for timeouts that occur while running a local_scan()
394 function.
395
396 Argument: the signal number
397 Returns: nothing
398 */
399
400 static void
401 local_scan_timeout_handler(int sig)
402 {
403 sig = sig; /* Keep picky compilers happy */
404 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
405 "message temporarily rejected (size %d)", message_size);
406 /* Does not return */
407 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
408 }
409
410
411
412 /*************************************************
413 * local_scan() crashed *
414 *************************************************/
415
416 /* Handler function for signals that occur while running a local_scan()
417 function.
418
419 Argument: the signal number
420 Returns: nothing
421 */
422
423 static void
424 local_scan_crash_handler(int sig)
425 {
426 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
427 "signal %d - message temporarily rejected (size %d)", sig, message_size);
428 /* Does not return */
429 receive_bomb_out(US"local-scan-error", US"local verification problem");
430 }
431
432
433 /*************************************************
434 * SIGTERM or SIGINT received *
435 *************************************************/
436
437 /* Handler for SIGTERM or SIGINT signals that occur while reading the
438 data that comprises a message.
439
440 Argument: the signal number
441 Returns: nothing
442 */
443
444 static void
445 data_sigterm_sigint_handler(int sig)
446 {
447 uschar *msg = NULL;
448
449 if (smtp_input)
450 {
451 msg = US"Service not available - SIGTERM or SIGINT received";
452 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
453 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
454 }
455 else
456 {
457 if (filter_test == FTEST_NONE)
458 {
459 fprintf(stderr, "\nexim: %s received - message abandoned\n",
460 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
461 log_write(0, LOG_MAIN, "%s received while reading local message",
462 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
463 }
464 }
465
466 receive_bomb_out(US"signal-exit", msg); /* Does not return */
467 }
468
469
470
471 /*************************************************
472 * Add new recipient to list *
473 *************************************************/
474
475 /* This function builds a list of recipient addresses in argc/argv
476 format.
477
478 Arguments:
479 recipient the next address to add to recipients_list
480 pno parent number for fixed aliases; -1 otherwise
481
482 Returns: nothing
483 */
484
485 void
486 receive_add_recipient(uschar *recipient, int pno)
487 {
488 if (recipients_count >= recipients_list_max)
489 {
490 recipient_item *oldlist = recipients_list;
491 int oldmax = recipients_list_max;
492 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
493 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
494 if (oldlist != NULL)
495 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
496 }
497
498 recipients_list[recipients_count].address = recipient;
499 recipients_list[recipients_count].pno = pno;
500 #ifdef EXPERIMENTAL_BRIGHTMAIL
501 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
502 /* reset optin string pointer for next recipient */
503 bmi_current_optin = NULL;
504 #endif
505 recipients_list[recipients_count].orcpt = NULL;
506 recipients_list[recipients_count].dsn_flags = 0;
507 recipients_list[recipients_count++].errors_to = NULL;
508 }
509
510
511
512
513 /*************************************************
514 * Send user response message *
515 *************************************************/
516
517 /* This function is passed a default response code and a user message. It calls
518 smtp_message_code() to check and possibly modify the response code, and then
519 calls smtp_respond() to transmit the response. I put this into a function
520 just to avoid a lot of repetition.
521
522 Arguments:
523 code the response code
524 user_msg the user message
525
526 Returns: nothing
527 */
528
529 #ifndef DISABLE_PRDR
530 static void
531 smtp_user_msg(uschar *code, uschar *user_msg)
532 {
533 int len = 3;
534 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
535 smtp_respond(code, len, TRUE, user_msg);
536 }
537 #endif
538
539
540
541
542
543 /*************************************************
544 * Remove a recipient from the list *
545 *************************************************/
546
547 /* This function is provided for local_scan() to use.
548
549 Argument:
550 recipient address to remove
551
552 Returns: TRUE if it did remove something; FALSE otherwise
553 */
554
555 BOOL
556 receive_remove_recipient(uschar *recipient)
557 {
558 int count;
559 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
560 recipient);
561 for (count = 0; count < recipients_count; count++)
562 {
563 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
564 {
565 if ((--recipients_count - count) > 0)
566 memmove(recipients_list + count, recipients_list + count + 1,
567 (recipients_count - count)*sizeof(recipient_item));
568 return TRUE;
569 }
570 }
571 return FALSE;
572 }
573
574
575
576
577
578 /*************************************************
579 * Read data portion of a non-SMTP message *
580 *************************************************/
581
582 /* This function is called to read the remainder of a message (following the
583 header) when the input is not from SMTP - we are receiving a local message on
584 a standard input stream. The message is always terminated by EOF, and is also
585 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
586 two cases for maximum efficiency.
587
588 Ensure that the body ends with a newline. This will naturally be the case when
589 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
590 as "sequences of lines" - this of course strictly applies only to SMTP, but
591 deliveries into BSD-type mailbox files also require it. Exim used to have a
592 flag for doing this at delivery time, but as it was always set for all
593 transports, I decided to simplify things by putting the check here instead.
594
595 There is at least one MUA (dtmail) that sends CRLF via this interface, and
596 other programs are known to do this as well. Exim used to have a option for
597 dealing with this: in July 2003, after much discussion, the code has been
598 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
599
600 However, for the case when a dot on a line by itself terminates a message, the
601 only recognized terminating sequences before and after the dot are LF and CRLF.
602 Otherwise, having read EOL . CR, you don't know whether to read another
603 character or not.
604
605 Internally, in messages stored in Exim's spool files, LF is used as the line
606 terminator. Under the new regime, bare CRs will no longer appear in these
607 files.
608
609 Arguments:
610 fout a FILE to which to write the message
611
612 Returns: One of the END_xxx values indicating why it stopped reading
613 */
614
615 static int
616 read_message_data(FILE *fout)
617 {
618 int ch_state;
619 register int ch;
620 register int linelength = 0;
621
622 /* Handle the case when only EOF terminates the message */
623
624 if (!dot_ends)
625 {
626 register int last_ch = '\n';
627
628 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
629 {
630 if (ch == 0) body_zerocount++;
631 if (last_ch == '\r' && ch != '\n')
632 {
633 if (linelength > max_received_linelength)
634 max_received_linelength = linelength;
635 linelength = 0;
636 if (fputc('\n', fout) == EOF) return END_WERROR;
637 message_size++;
638 body_linecount++;
639 }
640 if (ch == '\r') continue;
641
642 if (fputc(ch, fout) == EOF) return END_WERROR;
643 if (ch == '\n')
644 {
645 if (linelength > max_received_linelength)
646 max_received_linelength = linelength;
647 linelength = 0;
648 body_linecount++;
649 }
650 else linelength++;
651 if (++message_size > thismessage_size_limit) return END_SIZE;
652 }
653
654 if (last_ch != '\n')
655 {
656 if (linelength > max_received_linelength)
657 max_received_linelength = linelength;
658 if (fputc('\n', fout) == EOF) return END_WERROR;
659 message_size++;
660 body_linecount++;
661 }
662
663 return END_EOF;
664 }
665
666 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
667
668 ch_state = 1;
669
670 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
671 {
672 if (ch == 0) body_zerocount++;
673 switch (ch_state)
674 {
675 case 0: /* Normal state (previous char written) */
676 if (ch == '\n')
677 {
678 body_linecount++;
679 if (linelength > max_received_linelength)
680 max_received_linelength = linelength;
681 linelength = -1;
682 ch_state = 1;
683 }
684 else if (ch == '\r')
685 { ch_state = 2; continue; }
686 break;
687
688 case 1: /* After written "\n" */
689 if (ch == '.') { ch_state = 3; continue; }
690 if (ch == '\r') { ch_state = 2; continue; }
691 if (ch == '\n') { body_linecount++; linelength = -1; }
692 else ch_state = 0;
693 break;
694
695 case 2:
696 body_linecount++; /* After unwritten "\r" */
697 if (linelength > max_received_linelength)
698 max_received_linelength = linelength;
699 if (ch == '\n')
700 {
701 ch_state = 1;
702 linelength = -1;
703 }
704 else
705 {
706 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
707 if (ch == '\r') continue;
708 ch_state = 0;
709 linelength = 0;
710 }
711 break;
712
713 case 3: /* After "\n." (\n written, dot not) */
714 if (ch == '\n') return END_DOT;
715 if (ch == '\r') { ch_state = 4; continue; }
716 message_size++;
717 linelength++;
718 if (fputc('.', fout) == EOF) return END_WERROR;
719 ch_state = 0;
720 break;
721
722 case 4: /* After "\n.\r" (\n written, rest not) */
723 if (ch == '\n') return END_DOT;
724 message_size += 2;
725 body_linecount++;
726 if (fputs(".\n", fout) == EOF) return END_WERROR;
727 if (ch == '\r') { ch_state = 2; continue; }
728 ch_state = 0;
729 break;
730 }
731
732 linelength++;
733 if (fputc(ch, fout) == EOF) return END_WERROR;
734 if (++message_size > thismessage_size_limit) return END_SIZE;
735 }
736
737 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
738 the message ends with a newline, and we must also write any characters that
739 were saved up while testing for an ending dot. */
740
741 if (ch_state != 1)
742 {
743 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
744 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
745 message_size += Ustrlen(ends[ch_state]);
746 body_linecount++;
747 }
748
749 return END_EOF;
750 }
751
752
753
754
755 /*************************************************
756 * Read data portion of an SMTP message *
757 *************************************************/
758
759 /* This function is called to read the remainder of an SMTP message (after the
760 headers), or to skip over it when an error has occurred. In this case, the
761 output file is passed as NULL.
762
763 If any line begins with a dot, that character is skipped. The input should only
764 be successfully terminated by CR LF . CR LF unless it is local (non-network)
765 SMTP, in which case the CRs are optional, but...
766
767 FUDGE: It seems that sites on the net send out messages with just LF
768 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
769 we make the CRs optional in all cases.
770
771 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
772 well, so that there are no CRs in spooled messages. However, the message
773 terminating dot is not recognized between two bare CRs.
774
775 Arguments:
776 fout a FILE to which to write the message; NULL if skipping
777
778 Returns: One of the END_xxx values indicating why it stopped reading
779 */
780
781 static int
782 read_message_data_smtp(FILE *fout)
783 {
784 int ch_state = 0;
785 int ch;
786 int linelength = 0;
787
788 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
789 {
790 if (ch == 0) body_zerocount++;
791 switch (ch_state)
792 {
793 case 0: /* After LF or CRLF */
794 if (ch == '.')
795 {
796 ch_state = 3;
797 continue; /* Don't ever write . after LF */
798 }
799 ch_state = 1;
800
801 /* Else fall through to handle as normal uschar. */
802
803 case 1: /* Normal state */
804 if (ch == '\n')
805 {
806 ch_state = 0;
807 body_linecount++;
808 if (linelength > max_received_linelength)
809 max_received_linelength = linelength;
810 linelength = -1;
811 }
812 else if (ch == '\r')
813 {
814 ch_state = 2;
815 continue;
816 }
817 break;
818
819 case 2: /* After (unwritten) CR */
820 body_linecount++;
821 if (linelength > max_received_linelength)
822 max_received_linelength = linelength;
823 linelength = -1;
824 if (ch == '\n')
825 {
826 ch_state = 0;
827 }
828 else
829 {
830 message_size++;
831 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
832 cutthrough_data_put_nl();
833 if (ch != '\r') ch_state = 1; else continue;
834 }
835 break;
836
837 case 3: /* After [CR] LF . */
838 if (ch == '\n')
839 return END_DOT;
840 if (ch == '\r')
841 {
842 ch_state = 4;
843 continue;
844 }
845 /* The dot was removed at state 3. For a doubled dot, here, reinstate
846 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
847 and to file below. */
848 if (ch == '.')
849 {
850 uschar c= ch;
851 cutthrough_data_puts(&c, 1);
852 }
853 ch_state = 1;
854 break;
855
856 case 4: /* After [CR] LF . CR */
857 if (ch == '\n') return END_DOT;
858 message_size++;
859 body_linecount++;
860 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
861 cutthrough_data_put_nl();
862 if (ch == '\r')
863 {
864 ch_state = 2;
865 continue;
866 }
867 ch_state = 1;
868 break;
869 }
870
871 /* Add the character to the spool file, unless skipping; then loop for the
872 next. */
873
874 message_size++;
875 linelength++;
876 if (fout)
877 {
878 if (fputc(ch, fout) == EOF) return END_WERROR;
879 if (message_size > thismessage_size_limit) return END_SIZE;
880 }
881 if(ch == '\n')
882 cutthrough_data_put_nl();
883 else
884 {
885 uschar c = ch;
886 cutthrough_data_puts(&c, 1);
887 }
888 }
889
890 /* Fall through here if EOF encountered. This indicates some kind of error,
891 since a correct message is terminated by [CR] LF . [CR] LF. */
892
893 return END_EOF;
894 }
895
896
897
898
899 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
900 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
901 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
902 body_linecount accounting for proper re-expansion for the wire, so use
903 a cut-down version of the state-machine above; we don't need to do leading-dot
904 detection and unstuffing.
905
906 Arguments:
907 fout a FILE to which to write the message; NULL if skipping;
908 must be open for both writing and reading.
909
910 Returns: One of the END_xxx values indicating why it stopped reading
911 */
912
913 static int
914 read_message_bdat_smtp(FILE *fout)
915 {
916 int linelength = 0, ch;
917 enum CH_STATE ch_state = LF_SEEN;
918 BOOL fix_nl = FALSE;
919
920 for(;;)
921 {
922 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
923 {
924 case EOF: return END_EOF;
925 case ERR: return END_PROTOCOL;
926 case EOD:
927 /* Nothing to get from the sender anymore. We check the last
928 character written to the spool.
929
930 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
931 If we would be strict, we would refuse such broken messages.
932 But we are liberal, so we fix it. It would be easy just to append
933 the "\n" to the spool.
934
935 But there are some more things (line counting, message size calculation and such),
936 that would need to be duplicated here. So we simply do some ungetc
937 trickery.
938 */
939 if (fout)
940 {
941 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
942 if (fgetc(fout) == '\n') return END_DOT;
943 }
944
945 if (linelength == -1) /* \r already seen (see below) */
946 {
947 DEBUG(D_receive) debug_printf("Add missing LF\n");
948 bdat_ungetc('\n');
949 continue;
950 }
951 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
952 bdat_ungetc('\r'); /* not even \r was seen */
953 fix_nl = TRUE;
954
955 continue;
956 case '\0': body_zerocount++; break;
957 }
958 switch (ch_state)
959 {
960 case LF_SEEN: /* After LF or CRLF */
961 ch_state = MID_LINE;
962 /* fall through to handle as normal uschar. */
963
964 case MID_LINE: /* Mid-line state */
965 if (ch == '\n')
966 {
967 ch_state = LF_SEEN;
968 body_linecount++;
969 if (linelength > max_received_linelength)
970 max_received_linelength = linelength;
971 linelength = -1;
972 }
973 else if (ch == '\r')
974 {
975 ch_state = CR_SEEN;
976 if (fix_nl) bdat_ungetc('\n');
977 continue; /* don't write CR */
978 }
979 break;
980
981 case CR_SEEN: /* After (unwritten) CR */
982 body_linecount++;
983 if (linelength > max_received_linelength)
984 max_received_linelength = linelength;
985 linelength = -1;
986 if (ch == '\n')
987 ch_state = LF_SEEN;
988 else
989 {
990 message_size++;
991 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
992 cutthrough_data_put_nl();
993 if (ch == '\r') continue; /* don't write CR */
994 ch_state = MID_LINE;
995 }
996 break;
997 }
998
999 /* Add the character to the spool file, unless skipping */
1000
1001 message_size++;
1002 linelength++;
1003 if (fout)
1004 {
1005 if (fputc(ch, fout) == EOF) return END_WERROR;
1006 if (message_size > thismessage_size_limit) return END_SIZE;
1007 }
1008 if(ch == '\n')
1009 cutthrough_data_put_nl();
1010 else
1011 {
1012 uschar c = ch;
1013 cutthrough_data_puts(&c, 1);
1014 }
1015 }
1016 /*NOTREACHED*/
1017 }
1018
1019 static int
1020 read_message_bdat_smtp_wire(FILE *fout)
1021 {
1022 int ch;
1023
1024 /* Remember that this message uses wireformat. */
1025
1026 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1027 fout ? "writing spoolfile in wire format" : "flushing input");
1028 spool_file_wireformat = TRUE;
1029
1030 for (;;)
1031 {
1032 if (chunking_data_left > 0)
1033 {
1034 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1035 uschar * buf = bdat_getbuf(&len);
1036
1037 message_size += len;
1038 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1039 }
1040 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1041 {
1042 case EOF: return END_EOF;
1043 case EOD: return END_DOT;
1044 case ERR: return END_PROTOCOL;
1045
1046 default:
1047 message_size++;
1048 /*XXX not done:
1049 linelength
1050 max_received_linelength
1051 body_linecount
1052 body_zerocount
1053 */
1054 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1055 break;
1056 }
1057 if (message_size > thismessage_size_limit) return END_SIZE;
1058 }
1059 /*NOTREACHED*/
1060 }
1061
1062
1063
1064
1065 /*************************************************
1066 * Swallow SMTP message *
1067 *************************************************/
1068
1069 /* This function is called when there has been some kind of error while reading
1070 an SMTP message, and the remaining data may need to be swallowed. It is global
1071 because it is called from smtp_closedown() to shut down an incoming call
1072 tidily.
1073
1074 Argument: a FILE from which to read the message
1075 Returns: nothing
1076 */
1077
1078 void
1079 receive_swallow_smtp(void)
1080 {
1081 if (message_ended >= END_NOTENDED)
1082 message_ended = chunking_state <= CHUNKING_OFFERED
1083 ? read_message_data_smtp(NULL)
1084 : read_message_bdat_smtp_wire(NULL);
1085 }
1086
1087
1088
1089 /*************************************************
1090 * Handle lost SMTP connection *
1091 *************************************************/
1092
1093 /* This function logs connection loss incidents and generates an appropriate
1094 SMTP response.
1095
1096 Argument: additional data for the message
1097 Returns: the SMTP response
1098 */
1099
1100 static uschar *
1101 handle_lost_connection(uschar *s)
1102 {
1103 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1104 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1105 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1106 return US"421 Lost incoming connection";
1107 }
1108
1109
1110
1111
1112 /*************************************************
1113 * Handle a non-smtp reception error *
1114 *************************************************/
1115
1116 /* This function is called for various errors during the reception of non-SMTP
1117 messages. It either sends a message to the sender of the problem message, or it
1118 writes to the standard error stream.
1119
1120 Arguments:
1121 errcode code for moan_to_sender(), identifying the error
1122 text1 first message text, passed to moan_to_sender()
1123 text2 second message text, used only for stderrr
1124 error_rc code to pass to exim_exit if no problem
1125 f FILE containing body of message (may be stdin)
1126 hptr pointer to instore headers or NULL
1127
1128 Returns: calls exim_exit(), which does not return
1129 */
1130
1131 static void
1132 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1133 FILE *f, header_line *hptr)
1134 {
1135 if (error_handling == ERRORS_SENDER)
1136 {
1137 error_block eblock;
1138 eblock.next = NULL;
1139 eblock.text1 = text1;
1140 eblock.text2 = US"";
1141 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1142 error_rc = EXIT_FAILURE;
1143 }
1144 else
1145 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1146 (void)fclose(f);
1147 exim_exit(error_rc, US"");
1148 }
1149
1150
1151
1152 /*************************************************
1153 * Add header lines set up by ACL *
1154 *************************************************/
1155
1156 /* This function is called to add the header lines that were set up by
1157 statements in an ACL to the list of headers in memory. It is done in two stages
1158 like this, because when the ACL for RCPT is running, the other headers have not
1159 yet been received. This function is called twice; once just before running the
1160 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1161 are visible to the DATA ACL.
1162
1163 Originally these header lines were added at the end. Now there is support for
1164 three different places: top, bottom, and after the Received: header(s). There
1165 will always be at least one Received: header, even if it is marked deleted, and
1166 even if something else has been put in front of it.
1167
1168 Arguments:
1169 acl_name text to identify which ACL
1170
1171 Returns: nothing
1172 */
1173
1174 static void
1175 add_acl_headers(int where, uschar *acl_name)
1176 {
1177 header_line *h, *next;
1178 header_line *last_received = NULL;
1179
1180 switch(where)
1181 {
1182 case ACL_WHERE_DKIM:
1183 case ACL_WHERE_MIME:
1184 case ACL_WHERE_DATA:
1185 if ( cutthrough.fd >= 0 && cutthrough.delivery
1186 && (acl_removed_headers || acl_added_headers))
1187 {
1188 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1189 " will not take effect on cutthrough deliveries");
1190 return;
1191 }
1192 }
1193
1194 if (acl_removed_headers)
1195 {
1196 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1197
1198 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1199 {
1200 const uschar * list = acl_removed_headers;
1201 int sep = ':'; /* This is specified as a colon-separated list */
1202 uschar *s;
1203 uschar buffer[128];
1204
1205 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1206 if (header_testname(h, s, Ustrlen(s), FALSE))
1207 {
1208 h->type = htype_old;
1209 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1210 }
1211 }
1212 acl_removed_headers = NULL;
1213 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1214 }
1215
1216 if (!acl_added_headers) return;
1217 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1218
1219 for (h = acl_added_headers; h; h = next)
1220 {
1221 next = h->next;
1222
1223 switch(h->type)
1224 {
1225 case htype_add_top:
1226 h->next = header_list;
1227 header_list = h;
1228 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1229 break;
1230
1231 case htype_add_rec:
1232 if (last_received == NULL)
1233 {
1234 last_received = header_list;
1235 while (!header_testname(last_received, US"Received", 8, FALSE))
1236 last_received = last_received->next;
1237 while (last_received->next != NULL &&
1238 header_testname(last_received->next, US"Received", 8, FALSE))
1239 last_received = last_received->next;
1240 }
1241 h->next = last_received->next;
1242 last_received->next = h;
1243 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1244 break;
1245
1246 case htype_add_rfc:
1247 /* add header before any header which is NOT Received: or Resent- */
1248 last_received = header_list;
1249 while ( (last_received->next != NULL) &&
1250 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1251 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1252 last_received = last_received->next;
1253 /* last_received now points to the last Received: or Resent-* header
1254 in an uninterrupted chain of those header types (seen from the beginning
1255 of all headers. Our current header must follow it. */
1256 h->next = last_received->next;
1257 last_received->next = h;
1258 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1259 break;
1260
1261 default:
1262 h->next = NULL;
1263 header_last->next = h;
1264 break;
1265 }
1266
1267 if (h->next == NULL) header_last = h;
1268
1269 /* Check for one of the known header types (From:, To:, etc.) though in
1270 practice most added headers are going to be "other". Lower case
1271 identification letters are never stored with the header; they are used
1272 for existence tests when messages are received. So discard any lower case
1273 flag values. */
1274
1275 h->type = header_checkname(h, FALSE);
1276 if (h->type >= 'a') h->type = htype_other;
1277
1278 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", header_last->text);
1279 }
1280
1281 acl_added_headers = NULL;
1282 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1283 }
1284
1285
1286
1287 /*************************************************
1288 * Add host information for log line *
1289 *************************************************/
1290
1291 /* Called for acceptance and rejecting log lines. This adds information about
1292 the calling host to a string that is being built dynamically.
1293
1294 Arguments:
1295 s the dynamic string
1296
1297 Returns: the extended string
1298 */
1299
1300 static gstring *
1301 add_host_info_for_log(gstring * g)
1302 {
1303 if (sender_fullhost)
1304 {
1305 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1306 g = string_catn(g, US" DS", 3);
1307 g = string_append(g, 2, US" H=", sender_fullhost);
1308 if (LOGGING(incoming_interface) && interface_address != NULL)
1309 {
1310 g = string_cat(g,
1311 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1312 }
1313 }
1314 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1315 {
1316 g = string_catn(g, US" TFO", 4);
1317 tcp_in_fastopen_logged = TRUE;
1318 }
1319 if (sender_ident)
1320 g = string_append(g, 2, US" U=", sender_ident);
1321 if (received_protocol)
1322 g = string_append(g, 2, US" P=", received_protocol);
1323 return g;
1324 }
1325
1326
1327
1328 #ifdef WITH_CONTENT_SCAN
1329
1330 /*************************************************
1331 * Run the MIME ACL on a message *
1332 *************************************************/
1333
1334 /* This code is in a subroutine so that it can be used for both SMTP
1335 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1336
1337 Arguments:
1338 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1339 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1340 smtp_reply_ptr Where SMTP reply is being built
1341 blackholed_by_ptr Where "blackholed by" message is being built
1342
1343 Returns: TRUE to carry on; FALSE to abandon the message
1344 */
1345
1346 static BOOL
1347 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1348 uschar **blackholed_by_ptr)
1349 {
1350 FILE *mbox_file;
1351 uschar * rfc822_file_path = NULL;
1352 unsigned long mbox_size;
1353 header_line *my_headerlist;
1354 uschar *user_msg, *log_msg;
1355 int mime_part_count_buffer = -1;
1356 uschar * mbox_filename;
1357 int rc = OK;
1358
1359 /* check if it is a MIME message */
1360
1361 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1362 if ( my_headerlist->type != '*' /* skip deleted headers */
1363 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1364 )
1365 {
1366 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1367 goto DO_MIME_ACL;
1368 }
1369
1370 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1371 return TRUE;
1372
1373 DO_MIME_ACL:
1374
1375 /* make sure the eml mbox file is spooled up */
1376 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1377 { /* error while spooling */
1378 log_write(0, LOG_MAIN|LOG_PANIC,
1379 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1380 Uunlink(spool_name);
1381 unspool_mbox();
1382 #ifdef EXPERIMENTAL_DCC
1383 dcc_ok = 0;
1384 #endif
1385 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1386 message_id[0] = 0; /* Indicate no message accepted */
1387 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1388 return FALSE; /* Indicate skip to end of receive function */
1389 }
1390
1391 mime_is_rfc822 = 0;
1392
1393 MIME_ACL_CHECK:
1394 mime_part_count = -1;
1395 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1396 (void)fclose(mbox_file);
1397
1398 if (rfc822_file_path)
1399 {
1400 mime_part_count = mime_part_count_buffer;
1401
1402 if (unlink(CS rfc822_file_path) == -1)
1403 {
1404 log_write(0, LOG_PANIC,
1405 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1406 goto END_MIME_ACL;
1407 }
1408 rfc822_file_path = NULL;
1409 }
1410
1411 /* check if we must check any message/rfc822 attachments */
1412 if (rc == OK)
1413 {
1414 uschar * scandir = string_copyn(mbox_filename,
1415 Ustrrchr(mbox_filename, '/') - mbox_filename);
1416 struct dirent * entry;
1417 DIR * tempdir;
1418
1419 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1420 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1421 {
1422 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1423 DEBUG(D_receive)
1424 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1425 rfc822_file_path);
1426 break;
1427 }
1428 closedir(tempdir);
1429
1430 if (rfc822_file_path)
1431 {
1432 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1433 {
1434 /* set RFC822 expansion variable */
1435 mime_is_rfc822 = 1;
1436 mime_part_count_buffer = mime_part_count;
1437 goto MIME_ACL_CHECK;
1438 }
1439 log_write(0, LOG_PANIC,
1440 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1441 unlink(CS rfc822_file_path);
1442 }
1443 }
1444
1445 END_MIME_ACL:
1446 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1447 if (rc == DISCARD)
1448 {
1449 recipients_count = 0;
1450 *blackholed_by_ptr = US"MIME ACL";
1451 }
1452 else if (rc != OK)
1453 {
1454 Uunlink(spool_name);
1455 unspool_mbox();
1456 #ifdef EXPERIMENTAL_DCC
1457 dcc_ok = 0;
1458 #endif
1459 if (smtp_input)
1460 {
1461 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1462 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1463 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1464 }
1465 message_id[0] = 0; /* Indicate no message accepted */
1466 return FALSE; /* Cause skip to end of receive function */
1467 }
1468
1469 return TRUE;
1470 }
1471
1472 #endif /* WITH_CONTENT_SCAN */
1473
1474
1475
1476 void
1477 received_header_gen(void)
1478 {
1479 uschar *received;
1480 uschar *timestamp;
1481 header_line *received_header= header_list;
1482
1483 timestamp = expand_string(US"${tod_full}");
1484 if (recipients_count == 1) received_for = recipients_list[0].address;
1485 received = expand_string(received_header_text);
1486 received_for = NULL;
1487
1488 if (!received)
1489 {
1490 if(spool_name[0] != 0)
1491 Uunlink(spool_name); /* Lose the data file */
1492 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1493 "(received_header_text) failed: %s", string_printing(received_header_text),
1494 expand_string_message);
1495 }
1496
1497 /* The first element on the header chain is reserved for the Received header,
1498 so all we have to do is fill in the text pointer, and set the type. However, if
1499 the result of the expansion is an empty string, we leave the header marked as
1500 "old" so as to refrain from adding a Received header. */
1501
1502 if (received[0] == 0)
1503 {
1504 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1505 received_header->type = htype_old;
1506 }
1507 else
1508 {
1509 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1510 received_header->type = htype_received;
1511 }
1512
1513 received_header->slen = Ustrlen(received_header->text);
1514
1515 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1516 received_header->type, received_header->text);
1517 }
1518
1519
1520
1521 /*************************************************
1522 * Receive message *
1523 *************************************************/
1524
1525 /* Receive a message on the given input, and put it into a pair of spool files.
1526 Either a non-null list of recipients, or the extract flag will be true, or
1527 both. The flag sender_local is true for locally generated messages. The flag
1528 submission_mode is true if an ACL has obeyed "control = submission". The flag
1529 suppress_local_fixups is true if an ACL has obeyed "control =
1530 suppress_local_fixups" or -G was passed on the command-line.
1531 The flag smtp_input is true if the message is to be
1532 handled using SMTP conventions about termination and lines starting with dots.
1533 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1534
1535 If a message was successfully read, message_id[0] will be non-zero.
1536
1537 The general actions of this function are:
1538
1539 . Read the headers of the message (if any) into a chain of store
1540 blocks.
1541
1542 . If there is a "sender:" header and the message is locally originated,
1543 throw it away, unless the caller is trusted, or unless
1544 active_local_sender_retain is set - which can only happen if
1545 active_local_from_check is false.
1546
1547 . If recipients are to be extracted from the message, build the
1548 recipients list from the headers, removing any that were on the
1549 original recipients list (unless extract_addresses_remove_arguments is
1550 false), and at the same time, remove any bcc header that may be present.
1551
1552 . Get the spool file for the data, sort out its unique name, open
1553 and lock it (but don't give it the name yet).
1554
1555 . Generate a "Message-Id" header if the message doesn't have one, for
1556 locally-originated messages.
1557
1558 . Generate a "Received" header.
1559
1560 . Ensure the recipients list is fully qualified and rewritten if necessary.
1561
1562 . If there are any rewriting rules, apply them to the sender address
1563 and also to the headers.
1564
1565 . If there is no from: header, generate one, for locally-generated messages
1566 and messages in "submission mode" only.
1567
1568 . If the sender is local, check that from: is correct, and if not, generate
1569 a Sender: header, unless message comes from a trusted caller, or this
1570 feature is disabled by active_local_from_check being false.
1571
1572 . If there is no "date" header, generate one, for locally-originated
1573 or submission mode messages only.
1574
1575 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1576 dot_ends mode, to the data file. Leave it open, to hold the lock.
1577
1578 . Write the envelope and the headers to a new file.
1579
1580 . Set the name for the header file; close it.
1581
1582 . Set the name for the data file; close it.
1583
1584 Because this function can potentially be called many times in a single
1585 SMTP connection, all store should be got by store_get(), so that it will be
1586 automatically retrieved after the message is accepted.
1587
1588 FUDGE: It seems that sites on the net send out messages with just LF
1589 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1590 we make the CRs optional in all cases.
1591
1592 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1593 new regime is now in place in which bare CRs in header lines are turned into LF
1594 followed by a space, so as not to terminate the header line.
1595
1596 February 2004: A bare LF in a header line in a message whose first line was
1597 terminated by CRLF is treated in the same way as a bare CR.
1598
1599 Arguments:
1600 extract_recip TRUE if recipients are to be extracted from the message's
1601 headers
1602
1603 Returns: TRUE there are more messages to be read (SMTP input)
1604 FALSE there are no more messages to be read (non-SMTP input
1605 or SMTP connection collapsed, or other failure)
1606
1607 When reading a message for filter testing, the returned value indicates
1608 whether the headers (which is all that is read) were terminated by '.' or
1609 not. */
1610
1611 BOOL
1612 receive_msg(BOOL extract_recip)
1613 {
1614 int i;
1615 int rc = FAIL;
1616 int msg_size = 0;
1617 int process_info_len = Ustrlen(process_info);
1618 int error_rc = (error_handling == ERRORS_SENDER)?
1619 errors_sender_rc : EXIT_FAILURE;
1620 int header_size = 256;
1621 int start, end, domain;
1622 int id_resolution;
1623 int had_zero = 0;
1624 int prevlines_length = 0;
1625
1626 register int ptr = 0;
1627
1628 BOOL contains_resent_headers = FALSE;
1629 BOOL extracted_ignored = FALSE;
1630 BOOL first_line_ended_crlf = TRUE_UNSET;
1631 BOOL smtp_yield = TRUE;
1632 BOOL yield = FALSE;
1633
1634 BOOL resents_exist = FALSE;
1635 uschar *resent_prefix = US"";
1636 uschar *blackholed_by = NULL;
1637 uschar *blackhole_log_msg = US"";
1638 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1639
1640 flock_t lock_data;
1641 error_block *bad_addresses = NULL;
1642
1643 uschar *frozen_by = NULL;
1644 uschar *queued_by = NULL;
1645
1646 uschar *errmsg;
1647 gstring * g;
1648 struct stat statbuf;
1649
1650 /* Final message to give to SMTP caller, and messages from ACLs */
1651
1652 uschar *smtp_reply = NULL;
1653 uschar *user_msg, *log_msg;
1654
1655 /* Working header pointers */
1656
1657 header_line *h, *next;
1658
1659 /* Flags for noting the existence of certain headers (only one left) */
1660
1661 BOOL date_header_exists = FALSE;
1662
1663 /* Pointers to receive the addresses of headers whose contents we need. */
1664
1665 header_line *from_header = NULL;
1666 header_line *subject_header = NULL;
1667 header_line *msgid_header = NULL;
1668 header_line *received_header;
1669
1670 #ifdef EXPERIMENTAL_DMARC
1671 int dmarc_up = 0;
1672 #endif /* EXPERIMENTAL_DMARC */
1673
1674 /* Variables for use when building the Received: header. */
1675
1676 uschar *timestamp;
1677 int tslen;
1678
1679 /* Release any open files that might have been cached while preparing to
1680 accept the message - e.g. by verifying addresses - because reading a message
1681 might take a fair bit of real time. */
1682
1683 search_tidyup();
1684
1685 /* Extracting the recipient list from an input file is incompatible with
1686 cutthrough delivery with the no-spool option. It shouldn't be possible
1687 to set up the combination, but just in case kill any ongoing connection. */
1688 if (extract_recip || !smtp_input)
1689 cancel_cutthrough_connection(TRUE, US"not smtp input");
1690
1691 /* Initialize the chain of headers by setting up a place-holder for Received:
1692 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1693 pointing to the end of the chain to make adding headers simple. */
1694
1695 received_header = header_list = header_last = store_get(sizeof(header_line));
1696 header_list->next = NULL;
1697 header_list->type = htype_old;
1698 header_list->text = NULL;
1699 header_list->slen = 0;
1700
1701 /* Control block for the next header to be read. */
1702
1703 next = store_get(sizeof(header_line));
1704 next->text = store_get(header_size);
1705
1706 /* Initialize message id to be null (indicating no message read), and the
1707 header names list to be the normal list. Indicate there is no data file open
1708 yet, initialize the size and warning count, and deal with no size limit. */
1709
1710 message_id[0] = 0;
1711 data_file = NULL;
1712 data_fd = -1;
1713 spool_name = US"";
1714 message_size = 0;
1715 warning_count = 0;
1716 received_count = 1; /* For the one we will add */
1717
1718 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1719
1720 /* While reading the message, the following counts are computed. */
1721
1722 message_linecount = body_linecount = body_zerocount =
1723 max_received_linelength = 0;
1724
1725 #ifndef DISABLE_DKIM
1726 /* Call into DKIM to set up the context. In CHUNKING mode
1727 we clear the dot-stuffing flag */
1728 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1729 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1730 #endif
1731
1732 #ifdef EXPERIMENTAL_DMARC
1733 /* initialize libopendmarc */
1734 dmarc_up = dmarc_init();
1735 #endif
1736
1737 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1738 ids, and fractions of a second are required. See the comments that precede the
1739 message id creation below. */
1740
1741 (void)gettimeofday(&message_id_tv, NULL);
1742
1743 /* For other uses of the received time we can operate with granularity of one
1744 second, and for that we use the global variable received_time. This is for
1745 things like ultimate message timeouts.XXX */
1746
1747 received_time = message_id_tv;
1748
1749 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1750 happen in the smtp_getc() function when it refills its buffer. */
1751
1752 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1753
1754 /* If not SMTP input, timeout happens only if configured, and we just set a
1755 single timeout for the whole message. */
1756
1757 else if (receive_timeout > 0)
1758 {
1759 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1760 alarm(receive_timeout);
1761 }
1762
1763 /* SIGTERM and SIGINT are caught always. */
1764
1765 signal(SIGTERM, data_sigterm_sigint_handler);
1766 signal(SIGINT, data_sigterm_sigint_handler);
1767
1768 /* Header lines in messages are not supposed to be very long, though when
1769 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1770 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1771 storing the header, and extend this as necessary using string_cat().
1772
1773 To cope with total lunacies, impose an upper limit on the length of the header
1774 section of the message, as otherwise the store will fill up. We must also cope
1775 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1776 Folded header lines are joined into one string, leaving the '\n' characters
1777 inside them, so that writing them out reproduces the input.
1778
1779 Loop for each character of each header; the next structure for chaining the
1780 header is set up already, with ptr the offset of the next character in
1781 next->text. */
1782
1783 for (;;)
1784 {
1785 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1786
1787 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1788 SMTP must have a correct "." terminator. */
1789
1790 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1791 {
1792 smtp_reply = handle_lost_connection(US" (header)");
1793 smtp_yield = FALSE;
1794 goto TIDYUP; /* Skip to end of function */
1795 }
1796
1797 /* See if we are at the current header's size limit - there must be at least
1798 four bytes left. This allows for the new character plus a zero, plus two for
1799 extra insertions when we are playing games with dots and carriage returns. If
1800 we are at the limit, extend the text buffer. This could have been done
1801 automatically using string_cat() but because this is a tightish loop storing
1802 only one character at a time, we choose to do it inline. Normally
1803 store_extend() will be able to extend the block; only at the end of a big
1804 store block will a copy be needed. To handle the case of very long headers
1805 (and sometimes lunatic messages can have ones that are 100s of K long) we
1806 call store_release() for strings that have been copied - if the string is at
1807 the start of a block (and therefore the only thing in it, because we aren't
1808 doing any other gets), the block gets freed. We can only do this release if
1809 there were no allocations since the once that we want to free. */
1810
1811 if (ptr >= header_size - 4)
1812 {
1813 int oldsize = header_size;
1814 /* header_size += 256; */
1815 header_size *= 2;
1816 if (!store_extend(next->text, oldsize, header_size))
1817 next->text = store_newblock(next->text, header_size, ptr);
1818 }
1819
1820 /* Cope with receiving a binary zero. There is dispute about whether
1821 these should be allowed in RFC 822 messages. The middle view is that they
1822 should not be allowed in headers, at least. Exim takes this attitude at
1823 the moment. We can't just stomp on them here, because we don't know that
1824 this line is a header yet. Set a flag to cause scanning later. */
1825
1826 if (ch == 0) had_zero++;
1827
1828 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1829 those from data files use just LF. Treat LF in local SMTP input as a
1830 terminator too. Treat EOF as a line terminator always. */
1831
1832 if (ch == EOF) goto EOL;
1833
1834 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1835 other MTAs accept this. We are therefore forced into this "liberalisation"
1836 too, so we accept LF as a line terminator whatever the source of the message.
1837 However, if the first line of the message ended with a CRLF, we treat a bare
1838 LF specially by inserting a white space after it to ensure that the header
1839 line is not terminated. */
1840
1841 if (ch == '\n')
1842 {
1843 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1844 else if (first_line_ended_crlf) receive_ungetc(' ');
1845 goto EOL;
1846 }
1847
1848 /* This is not the end of the line. If this is SMTP input and this is
1849 the first character in the line and it is a "." character, ignore it.
1850 This implements the dot-doubling rule, though header lines starting with
1851 dots aren't exactly common. They are legal in RFC 822, though. If the
1852 following is CRLF or LF, this is the line that that terminates the
1853 entire message. We set message_ended to indicate this has happened (to
1854 prevent further reading), and break out of the loop, having freed the
1855 empty header, and set next = NULL to indicate no data line. */
1856
1857 if (ptr == 0 && ch == '.' && dot_ends)
1858 {
1859 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1860 if (ch == '\r')
1861 {
1862 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1863 if (ch != '\n')
1864 {
1865 receive_ungetc(ch);
1866 ch = '\r'; /* Revert to CR */
1867 }
1868 }
1869 if (ch == '\n')
1870 {
1871 message_ended = END_DOT;
1872 store_reset(next);
1873 next = NULL;
1874 break; /* End character-reading loop */
1875 }
1876
1877 /* For non-SMTP input, the dot at the start of the line was really a data
1878 character. What is now in ch is the following character. We guaranteed
1879 enough space for this above. */
1880
1881 if (!smtp_input)
1882 {
1883 next->text[ptr++] = '.';
1884 message_size++;
1885 }
1886 }
1887
1888 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1889 remember this case if this is the first line ending. */
1890
1891 if (ch == '\r')
1892 {
1893 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1894 if (ch == '\n')
1895 {
1896 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1897 goto EOL;
1898 }
1899
1900 /* Otherwise, put back the character after CR, and turn the bare CR
1901 into LF SP. */
1902
1903 ch = (receive_ungetc)(ch);
1904 next->text[ptr++] = '\n';
1905 message_size++;
1906 ch = ' ';
1907 }
1908
1909 /* We have a data character for the header line. */
1910
1911 next->text[ptr++] = ch; /* Add to buffer */
1912 message_size++; /* Total message size so far */
1913
1914 /* Handle failure due to a humungously long header section. The >= allows
1915 for the terminating \n. Add what we have so far onto the headers list so
1916 that it gets reflected in any error message, and back up the just-read
1917 character. */
1918
1919 if (message_size >= header_maxsize)
1920 {
1921 next->text[ptr] = 0;
1922 next->slen = ptr;
1923 next->type = htype_other;
1924 next->next = NULL;
1925 header_last->next = next;
1926 header_last = next;
1927
1928 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1929 "%s (more than %d characters): message abandoned",
1930 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1931
1932 if (smtp_input)
1933 {
1934 smtp_reply = US"552 Message header is ridiculously long";
1935 receive_swallow_smtp();
1936 goto TIDYUP; /* Skip to end of function */
1937 }
1938
1939 else
1940 {
1941 give_local_error(ERRMESS_VLONGHEADER,
1942 string_sprintf("message header longer than %d characters received: "
1943 "message not accepted", header_maxsize), US"", error_rc, stdin,
1944 header_list->next);
1945 /* Does not return */
1946 }
1947 }
1948
1949 continue; /* With next input character */
1950
1951 /* End of header line reached */
1952
1953 EOL:
1954
1955 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1956
1957 receive_linecount++;
1958 message_linecount++;
1959
1960 /* Keep track of maximum line length */
1961
1962 if (ptr - prevlines_length > max_received_linelength)
1963 max_received_linelength = ptr - prevlines_length;
1964 prevlines_length = ptr + 1;
1965
1966 /* Now put in the terminating newline. There is always space for
1967 at least two more characters. */
1968
1969 next->text[ptr++] = '\n';
1970 message_size++;
1971
1972 /* A blank line signals the end of the headers; release the unwanted
1973 space and set next to NULL to indicate this. */
1974
1975 if (ptr == 1)
1976 {
1977 store_reset(next);
1978 next = NULL;
1979 break;
1980 }
1981
1982 /* There is data in the line; see if the next input character is a
1983 whitespace character. If it is, we have a continuation of this header line.
1984 There is always space for at least one character at this point. */
1985
1986 if (ch != EOF)
1987 {
1988 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1989 if (nextch == ' ' || nextch == '\t')
1990 {
1991 next->text[ptr++] = nextch;
1992 message_size++;
1993 continue; /* Iterate the loop */
1994 }
1995 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1996 else ch = EOF; /* Cause main loop to exit at end */
1997 }
1998
1999 /* We have got to the real line end. Terminate the string and release store
2000 beyond it. If it turns out to be a real header, internal binary zeros will
2001 be squashed later. */
2002
2003 next->text[ptr] = 0;
2004 next->slen = ptr;
2005 store_reset(next->text + ptr + 1);
2006
2007 /* Check the running total size against the overall message size limit. We
2008 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2009 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2010 headers - the code to read the body will then also hit the buffer. */
2011
2012 if (message_size > thismessage_size_limit) break;
2013
2014 /* A line that is not syntactically correct for a header also marks
2015 the end of the headers. In this case, we leave next containing the
2016 first data line. This might actually be several lines because of the
2017 continuation logic applied above, but that doesn't matter.
2018
2019 It turns out that smail, and presumably sendmail, accept leading lines
2020 of the form
2021
2022 From ph10 Fri Jan 5 12:35 GMT 1996
2023
2024 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2025 find any documentation of this, but for compatibility it had better be
2026 accepted. Exim restricts it to the case of non-smtp messages, and
2027 treats it as an alternative to the -f command line option. Thus it is
2028 ignored except for trusted users or filter testing. Otherwise it is taken
2029 as the sender address, unless -f was used (sendmail compatibility).
2030
2031 It further turns out that some UUCPs generate the From_line in a different
2032 format, e.g.
2033
2034 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2035
2036 The regex for matching these things is now capable of recognizing both
2037 formats (including 2- and 4-digit years in the latter). In fact, the regex
2038 is now configurable, as is the expansion string to fish out the sender.
2039
2040 Even further on it has been discovered that some broken clients send
2041 these lines in SMTP messages. There is now an option to ignore them from
2042 specified hosts or networks. Sigh. */
2043
2044 if ( header_last == header_list
2045 && ( !smtp_input
2046 || ( sender_host_address
2047 && verify_check_host(&ignore_fromline_hosts) == OK
2048 )
2049 || (!sender_host_address && ignore_fromline_local)
2050 )
2051 && regex_match_and_setup(regex_From, next->text, 0, -1)
2052 )
2053 {
2054 if (!sender_address_forced)
2055 {
2056 uschar *uucp_sender = expand_string(uucp_from_sender);
2057 if (!uucp_sender)
2058 log_write(0, LOG_MAIN|LOG_PANIC,
2059 "expansion of \"%s\" failed after matching "
2060 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2061 else
2062 {
2063 int start, end, domain;
2064 uschar *errmess;
2065 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2066 &start, &end, &domain, TRUE);
2067 if (newsender)
2068 {
2069 if (domain == 0 && newsender[0] != 0)
2070 newsender = rewrite_address_qualify(newsender, FALSE);
2071
2072 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2073 {
2074 sender_address = newsender;
2075
2076 if (trusted_caller || filter_test != FTEST_NONE)
2077 {
2078 authenticated_sender = NULL;
2079 originator_name = US"";
2080 sender_local = FALSE;
2081 }
2082
2083 if (filter_test != FTEST_NONE)
2084 printf("Sender taken from \"From \" line\n");
2085 }
2086 }
2087 }
2088 }
2089 }
2090
2091 /* Not a leading "From " line. Check to see if it is a valid header line.
2092 Header names may contain any non-control characters except space and colon,
2093 amazingly. */
2094
2095 else
2096 {
2097 uschar *p = next->text;
2098
2099 /* If not a valid header line, break from the header reading loop, leaving
2100 next != NULL, indicating that it holds the first line of the body. */
2101
2102 if (isspace(*p)) break;
2103 while (mac_isgraph(*p) && *p != ':') p++;
2104 while (isspace(*p)) p++;
2105 if (*p != ':')
2106 {
2107 body_zerocount = had_zero;
2108 break;
2109 }
2110
2111 /* We have a valid header line. If there were any binary zeroes in
2112 the line, stomp on them here. */
2113
2114 if (had_zero > 0)
2115 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2116
2117 /* It is perfectly legal to have an empty continuation line
2118 at the end of a header, but it is confusing to humans
2119 looking at such messages, since it looks like a blank line.
2120 Reduce confusion by removing redundant white space at the
2121 end. We know that there is at least one printing character
2122 (the ':' tested for above) so there is no danger of running
2123 off the end. */
2124
2125 p = next->text + ptr - 2;
2126 for (;;)
2127 {
2128 while (*p == ' ' || *p == '\t') p--;
2129 if (*p != '\n') break;
2130 ptr = (p--) - next->text + 1;
2131 message_size -= next->slen - ptr;
2132 next->text[ptr] = 0;
2133 next->slen = ptr;
2134 }
2135
2136 /* Add the header to the chain */
2137
2138 next->type = htype_other;
2139 next->next = NULL;
2140 header_last->next = next;
2141 header_last = next;
2142
2143 /* Check the limit for individual line lengths. This comes after adding to
2144 the chain so that the failing line is reflected if a bounce is generated
2145 (for a local message). */
2146
2147 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2148 {
2149 log_write(0, LOG_MAIN, "overlong message header line received from "
2150 "%s (more than %d characters): message abandoned",
2151 sender_host_unknown? sender_ident : sender_fullhost,
2152 header_line_maxsize);
2153
2154 if (smtp_input)
2155 {
2156 smtp_reply = US"552 A message header line is too long";
2157 receive_swallow_smtp();
2158 goto TIDYUP; /* Skip to end of function */
2159 }
2160
2161 else
2162 give_local_error(ERRMESS_VLONGHDRLINE,
2163 string_sprintf("message header line longer than %d characters "
2164 "received: message not accepted", header_line_maxsize), US"",
2165 error_rc, stdin, header_list->next);
2166 /* Does not return */
2167 }
2168
2169 /* Note if any resent- fields exist. */
2170
2171 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2172 {
2173 resents_exist = TRUE;
2174 resent_prefix = US"Resent-";
2175 }
2176 }
2177
2178 /* Reject CHUNKING messages that do not CRLF their first header line */
2179
2180 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2181 {
2182 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2183 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2184 sender_address,
2185 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2186 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2187 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2188 bdat_flush_data();
2189 smtp_reply = US"";
2190 goto TIDYUP; /* Skip to end of function */
2191 }
2192
2193 /* The line has been handled. If we have hit EOF, break out of the loop,
2194 indicating no pending data line. */
2195
2196 if (ch == EOF) { next = NULL; break; }
2197
2198 /* Set up for the next header */
2199
2200 header_size = 256;
2201 next = store_get(sizeof(header_line));
2202 next->text = store_get(header_size);
2203 ptr = 0;
2204 had_zero = 0;
2205 prevlines_length = 0;
2206 } /* Continue, starting to read the next header */
2207
2208 /* At this point, we have read all the headers into a data structure in main
2209 store. The first header is still the dummy placeholder for the Received: header
2210 we are going to generate a bit later on. If next != NULL, it contains the first
2211 data line - which terminated the headers before reaching a blank line (not the
2212 normal case). */
2213
2214 DEBUG(D_receive)
2215 {
2216 debug_printf(">>Headers received:\n");
2217 for (h = header_list->next; h; h = h->next)
2218 debug_printf("%s", h->text);
2219 debug_printf("\n");
2220 }
2221
2222 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2223 is dropped immediately after valid headers, the next thing we will see is EOF.
2224 We must test for this specially, as further down the reading of the data is
2225 skipped if already at EOF. */
2226
2227 if (smtp_input && (receive_feof)())
2228 {
2229 smtp_reply = handle_lost_connection(US" (after header)");
2230 smtp_yield = FALSE;
2231 goto TIDYUP; /* Skip to end of function */
2232 }
2233
2234 /* If this is a filter test run and no headers were read, output a warning
2235 in case there is a mistake in the test message. */
2236
2237 if (filter_test != FTEST_NONE && header_list->next == NULL)
2238 printf("Warning: no message headers read\n");
2239
2240
2241 /* Scan the headers to identify them. Some are merely marked for later
2242 processing; some are dealt with here. */
2243
2244 for (h = header_list->next; h; h = h->next)
2245 {
2246 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2247 if (is_resent) contains_resent_headers = TRUE;
2248
2249 switch (header_checkname(h, is_resent))
2250 {
2251 case htype_bcc:
2252 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2253 break;
2254
2255 case htype_cc:
2256 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2257 break;
2258
2259 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2260
2261 case htype_date:
2262 if (!resents_exist || is_resent) date_header_exists = TRUE;
2263 break;
2264
2265 /* Same comments as about Return-Path: below. */
2266
2267 case htype_delivery_date:
2268 if (delivery_date_remove) h->type = htype_old;
2269 break;
2270
2271 /* Same comments as about Return-Path: below. */
2272
2273 case htype_envelope_to:
2274 if (envelope_to_remove) h->type = htype_old;
2275 break;
2276
2277 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2278 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2279 header consists of just the login id of the user who called Exim, rewrite
2280 it with the gecos field first. Apply this rule to Resent-From: if there
2281 are resent- fields. */
2282
2283 case htype_from:
2284 h->type = htype_from;
2285 if (!resents_exist || is_resent)
2286 {
2287 from_header = h;
2288 if (!smtp_input)
2289 {
2290 int len;
2291 uschar *s = Ustrchr(h->text, ':') + 1;
2292 while (isspace(*s)) s++;
2293 len = h->slen - (s - h->text) - 1;
2294 if (Ustrlen(originator_login) == len &&
2295 strncmpic(s, originator_login, len) == 0)
2296 {
2297 uschar *name = is_resent? US"Resent-From" : US"From";
2298 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2299 originator_login, qualify_domain_sender);
2300 from_header = header_last;
2301 h->type = htype_old;
2302 DEBUG(D_receive|D_rewrite)
2303 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2304 }
2305 }
2306 }
2307 break;
2308
2309 /* Identify the Message-id: header for generating "in-reply-to" in the
2310 autoreply transport. For incoming logging, save any resent- value. In both
2311 cases, take just the first of any multiples. */
2312
2313 case htype_id:
2314 if (msgid_header == NULL && (!resents_exist || is_resent))
2315 {
2316 msgid_header = h;
2317 h->type = htype_id;
2318 }
2319 break;
2320
2321 /* Flag all Received: headers */
2322
2323 case htype_received:
2324 h->type = htype_received;
2325 received_count++;
2326 break;
2327
2328 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2329
2330 case htype_reply_to:
2331 h->type = htype_reply_to;
2332 break;
2333
2334 /* The Return-path: header is supposed to be added to messages when
2335 they leave the SMTP system. We shouldn't receive messages that already
2336 contain Return-path. However, since Exim generates Return-path: on
2337 local delivery, resent messages may well contain it. We therefore
2338 provide an option (which defaults on) to remove any Return-path: headers
2339 on input. Removal actually means flagging as "old", which prevents the
2340 header being transmitted with the message. */
2341
2342 case htype_return_path:
2343 if (return_path_remove) h->type = htype_old;
2344
2345 /* If we are testing a mail filter file, use the value of the
2346 Return-Path: header to set up the return_path variable, which is not
2347 otherwise set. However, remove any <> that surround the address
2348 because the variable doesn't have these. */
2349
2350 if (filter_test != FTEST_NONE)
2351 {
2352 uschar *start = h->text + 12;
2353 uschar *end = start + Ustrlen(start);
2354 while (isspace(*start)) start++;
2355 while (end > start && isspace(end[-1])) end--;
2356 if (*start == '<' && end[-1] == '>')
2357 {
2358 start++;
2359 end--;
2360 }
2361 return_path = string_copyn(start, end - start);
2362 printf("Return-path taken from \"Return-path:\" header line\n");
2363 }
2364 break;
2365
2366 /* If there is a "Sender:" header and the message is locally originated,
2367 and from an untrusted caller and suppress_local_fixups is not set, or if we
2368 are in submission mode for a remote message, mark it "old" so that it will
2369 not be transmitted with the message, unless active_local_sender_retain is
2370 set. (This can only be true if active_local_from_check is false.) If there
2371 are any resent- headers in the message, apply this rule to Resent-Sender:
2372 instead of Sender:. Messages with multiple resent- header sets cannot be
2373 tidily handled. (For this reason, at least one MUA - Pine - turns old
2374 resent- headers into X-resent- headers when resending, leaving just one
2375 set.) */
2376
2377 case htype_sender:
2378 h->type = ((!active_local_sender_retain &&
2379 (
2380 (sender_local && !trusted_caller && !suppress_local_fixups)
2381 || submission_mode
2382 )
2383 ) &&
2384 (!resents_exist||is_resent))?
2385 htype_old : htype_sender;
2386 break;
2387
2388 /* Remember the Subject: header for logging. There is no Resent-Subject */
2389
2390 case htype_subject:
2391 subject_header = h;
2392 break;
2393
2394 /* "To:" gets flagged, and the existence of a recipient header is noted,
2395 whether it's resent- or not. */
2396
2397 case htype_to:
2398 h->type = htype_to;
2399 /****
2400 to_or_cc_header_exists = TRUE;
2401 ****/
2402 break;
2403 }
2404 }
2405
2406 /* Extract recipients from the headers if that is required (the -t option).
2407 Note that this is documented as being done *before* any address rewriting takes
2408 place. There are two possibilities:
2409
2410 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2411 recipients already listed are to be REMOVED from the message. Smail 3 works
2412 like this. We need to build a non-recipients tree for that list, because in
2413 subsequent processing this data is held in a tree and that's what the
2414 spool_write_header() function expects. Make sure that non-recipient addresses
2415 are fully qualified and rewritten if necessary.
2416
2417 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2418 those in the command line arguments (and it is rumoured some other MTAs do
2419 this). Therefore, there is an option to make Exim behave this way.
2420
2421 *** Notes on "Resent-" header lines ***
2422
2423 The presence of resent-headers in the message makes -t horribly ambiguous.
2424 Experiments with sendmail showed that it uses recipients for all resent-
2425 headers, totally ignoring the concept of "sets of resent- headers" as described
2426 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2427 with all the addresses in one instance of each header.
2428
2429 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2430 error for -t if there were resent- headers in the message. However, after a
2431 discussion on the mailing list, I've learned that there are MUAs that use
2432 resent- headers with -t, and also that the stuff about sets of resent- headers
2433 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2434 message with -t and resent- header lines makes sure that only *its* resent-
2435 headers are present; previous ones are often renamed as X-resent- for example.
2436
2437 Consequently, Exim has been changed so that, if any resent- header lines are
2438 present, the recipients are taken from all of the appropriate resent- lines,
2439 and not from the ordinary To:, Cc:, etc. */
2440
2441 if (extract_recip)
2442 {
2443 int rcount = 0;
2444 error_block **bnext = &bad_addresses;
2445
2446 if (extract_addresses_remove_arguments)
2447 {
2448 while (recipients_count-- > 0)
2449 {
2450 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2451 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2452 tree_add_nonrecipient(s);
2453 }
2454 recipients_list = NULL;
2455 recipients_count = recipients_list_max = 0;
2456 }
2457
2458 /* Now scan the headers */
2459
2460 for (h = header_list->next; h; h = h->next)
2461 {
2462 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2463 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2464 {
2465 uschar *s = Ustrchr(h->text, ':') + 1;
2466 while (isspace(*s)) s++;
2467
2468 parse_allow_group = TRUE; /* Allow address group syntax */
2469
2470 while (*s != 0)
2471 {
2472 uschar *ss = parse_find_address_end(s, FALSE);
2473 uschar *recipient, *errmess, *p, *pp;
2474 int start, end, domain;
2475
2476 /* Check on maximum */
2477
2478 if (recipients_max > 0 && ++rcount > recipients_max)
2479 {
2480 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2481 US"message rejected: ", error_rc, stdin, NULL);
2482 /* Does not return */
2483 }
2484
2485 /* Make a copy of the address, and remove any internal newlines. These
2486 may be present as a result of continuations of the header line. The
2487 white space that follows the newline must not be removed - it is part
2488 of the header. */
2489
2490 pp = recipient = store_get(ss - s + 1);
2491 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2492 *pp = 0;
2493
2494 #ifdef SUPPORT_I18N
2495 {
2496 BOOL b = allow_utf8_domains;
2497 allow_utf8_domains = TRUE;
2498 #endif
2499 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2500 &domain, FALSE);
2501
2502 #ifdef SUPPORT_I18N
2503 if (string_is_utf8(recipient))
2504 message_smtputf8 = TRUE;
2505 else
2506 allow_utf8_domains = b;
2507 }
2508 #endif
2509
2510 /* Keep a list of all the bad addresses so we can send a single
2511 error message at the end. However, an empty address is not an error;
2512 just ignore it. This can come from an empty group list like
2513
2514 To: Recipients of list:;
2515
2516 If there are no recipients at all, an error will occur later. */
2517
2518 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2519 {
2520 int len = Ustrlen(s);
2521 error_block *b = store_get(sizeof(error_block));
2522 while (len > 0 && isspace(s[len-1])) len--;
2523 b->next = NULL;
2524 b->text1 = string_printing(string_copyn(s, len));
2525 b->text2 = errmess;
2526 *bnext = b;
2527 bnext = &(b->next);
2528 }
2529
2530 /* If the recipient is already in the nonrecipients tree, it must
2531 have appeared on the command line with the option extract_addresses_
2532 remove_arguments set. Do not add it to the recipients, and keep a note
2533 that this has happened, in order to give a better error if there are
2534 no recipients left. */
2535
2536 else if (recipient != NULL)
2537 {
2538 if (tree_search(tree_nonrecipients, recipient) == NULL)
2539 receive_add_recipient(recipient, -1);
2540 else
2541 extracted_ignored = TRUE;
2542 }
2543
2544 /* Move on past this address */
2545
2546 s = ss + (*ss? 1:0);
2547 while (isspace(*s)) s++;
2548 } /* Next address */
2549
2550 parse_allow_group = FALSE; /* Reset group syntax flags */
2551 parse_found_group = FALSE;
2552
2553 /* If this was the bcc: header, mark it "old", which means it
2554 will be kept on the spool, but not transmitted as part of the
2555 message. */
2556
2557 if (h->type == htype_bcc) h->type = htype_old;
2558 } /* For appropriate header line */
2559 } /* For each header line */
2560
2561 }
2562
2563 /* Now build the unique message id. This has changed several times over the
2564 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2565 Retaining all the history in the comment has become too unwieldy - read
2566 previous release sources if you want it.
2567
2568 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2569 The first part is the current time, in seconds. The second part is the current
2570 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2571 can hold a number in the range 0-3843. It used to be a computed sequence
2572 number, but is now the fractional component of the current time in units of
2573 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2574 received, Exim ensures that the timer has ticked at the appropriate level
2575 before proceeding, to avoid duplication if the pid happened to be re-used
2576 within the same time period. It seems likely that most messages will take at
2577 least half a millisecond to be received, so no delay will normally be
2578 necessary. At least for some time...
2579
2580 There is a modification when localhost_number is set. Formerly this was allowed
2581 to be as large as 255. Now it is restricted to the range 0-16, and the final
2582 component of the message id becomes (localhost_number * 200) + fractional time
2583 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2584
2585 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2586 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2587 still allows the tttttt field to hold a large enough number to last for some
2588 more decades, and the final two-digit field can hold numbers up to 1295, which
2589 is enough for milliseconds (instead of 1/2000 of a second).
2590
2591 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2592 pid, so it is probably safe because pids have to be positive. The
2593 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2594 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2595
2596 Note that string_base62() returns its data in a static storage block, so it
2597 must be copied before calling string_base62() again. It always returns exactly
2598 6 characters.
2599
2600 There doesn't seem to be anything in the RFC which requires a message id to
2601 start with a letter, but Smail was changed to ensure this. The external form of
2602 the message id (as supplied by string expansion) therefore starts with an
2603 additional leading 'E'. The spool file names do not include this leading
2604 letter and it is not used internally.
2605
2606 NOTE: If ever the format of message ids is changed, the regular expression for
2607 checking that a string is in this format must be updated in a corresponding
2608 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2609 must also be changed to reflect the correct string length. The queue-sort code
2610 needs to know the layout. Then, of course, other programs that rely on the
2611 message id format will need updating too. */
2612
2613 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2614 message_id[6] = '-';
2615 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2616
2617 /* Deal with the case where the host number is set. The value of the number was
2618 checked when it was read, to ensure it isn't too big. The timing granularity is
2619 left in id_resolution so that an appropriate wait can be done after receiving
2620 the message, if necessary (we hope it won't be). */
2621
2622 if (host_number_string != NULL)
2623 {
2624 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2625 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2626 string_base62((long int)(
2627 host_number * (1000000/id_resolution) +
2628 message_id_tv.tv_usec/id_resolution)) + 4);
2629 }
2630
2631 /* Host number not set: final field is just the fractional time at an
2632 appropriate resolution. */
2633
2634 else
2635 {
2636 id_resolution = (BASE_62 == 62)? 500 : 1000;
2637 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2638 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2639 }
2640
2641 /* Add the current message id onto the current process info string if
2642 it will fit. */
2643
2644 (void)string_format(process_info + process_info_len,
2645 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2646
2647 /* If we are using multiple input directories, set up the one for this message
2648 to be the least significant base-62 digit of the time of arrival. Otherwise
2649 ensure that it is an empty string. */
2650
2651 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2652
2653 /* Now that we have the message-id, if there is no message-id: header, generate
2654 one, but only for local (without suppress_local_fixups) or submission mode
2655 messages. This can be user-configured if required, but we had better flatten
2656 any illegal characters therein. */
2657
2658 if (msgid_header == NULL &&
2659 ((sender_host_address == NULL && !suppress_local_fixups)
2660 || submission_mode))
2661 {
2662 uschar *p;
2663 uschar *id_text = US"";
2664 uschar *id_domain = primary_hostname;
2665
2666 /* Permit only letters, digits, dots, and hyphens in the domain */
2667
2668 if (message_id_domain != NULL)
2669 {
2670 uschar *new_id_domain = expand_string(message_id_domain);
2671 if (new_id_domain == NULL)
2672 {
2673 if (!expand_string_forcedfail)
2674 log_write(0, LOG_MAIN|LOG_PANIC,
2675 "expansion of \"%s\" (message_id_header_domain) "
2676 "failed: %s", message_id_domain, expand_string_message);
2677 }
2678 else if (*new_id_domain != 0)
2679 {
2680 id_domain = new_id_domain;
2681 for (p = id_domain; *p != 0; p++)
2682 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2683 }
2684 }
2685
2686 /* Permit all characters except controls and RFC 2822 specials in the
2687 additional text part. */
2688
2689 if (message_id_text != NULL)
2690 {
2691 uschar *new_id_text = expand_string(message_id_text);
2692 if (new_id_text == NULL)
2693 {
2694 if (!expand_string_forcedfail)
2695 log_write(0, LOG_MAIN|LOG_PANIC,
2696 "expansion of \"%s\" (message_id_header_text) "
2697 "failed: %s", message_id_text, expand_string_message);
2698 }
2699 else if (*new_id_text != 0)
2700 {
2701 id_text = new_id_text;
2702 for (p = id_text; *p != 0; p++)
2703 if (mac_iscntrl_or_special(*p)) *p = '-';
2704 }
2705 }
2706
2707 /* Add the header line
2708 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2709 * appended, to preserve classical expectations of header ordering. */
2710
2711 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2712 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2713 (*id_text == 0)? "" : ".", id_text, id_domain);
2714 }
2715
2716 /* If we are to log recipients, keep a copy of the raw ones before any possible
2717 rewriting. Must copy the count, because later ACLs and the local_scan()
2718 function may mess with the real recipients. */
2719
2720 if (LOGGING(received_recipients))
2721 {
2722 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2723 for (i = 0; i < recipients_count; i++)
2724 raw_recipients[i] = string_copy(recipients_list[i].address);
2725 raw_recipients_count = recipients_count;
2726 }
2727
2728 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2729 recipients will get here only if the conditions were right (allow_unqualified_
2730 recipient is TRUE). */
2731
2732 for (i = 0; i < recipients_count; i++)
2733 recipients_list[i].address =
2734 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2735 global_rewrite_rules, rewrite_existflags);
2736
2737 /* If there is no From: header, generate one for local (without
2738 suppress_local_fixups) or submission_mode messages. If there is no sender
2739 address, but the sender is local or this is a local delivery error, use the
2740 originator login. This shouldn't happen for genuine bounces, but might happen
2741 for autoreplies. The addition of From: must be done *before* checking for the
2742 possible addition of a Sender: header, because untrusted_set_sender allows an
2743 untrusted user to set anything in the envelope (which might then get info
2744 From:) but we still want to ensure a valid Sender: if it is required. */
2745
2746 if (from_header == NULL &&
2747 ((sender_host_address == NULL && !suppress_local_fixups)
2748 || submission_mode))
2749 {
2750 uschar *oname = US"";
2751
2752 /* Use the originator_name if this is a locally submitted message and the
2753 caller is not trusted. For trusted callers, use it only if -F was used to
2754 force its value or if we have a non-SMTP message for which -f was not used
2755 to set the sender. */
2756
2757 if (sender_host_address == NULL)
2758 {
2759 if (!trusted_caller || sender_name_forced ||
2760 (!smtp_input && !sender_address_forced))
2761 oname = originator_name;
2762 }
2763
2764 /* For non-locally submitted messages, the only time we use the originator
2765 name is when it was forced by the /name= option on control=submission. */
2766
2767 else
2768 {
2769 if (submission_name != NULL) oname = submission_name;
2770 }
2771
2772 /* Envelope sender is empty */
2773
2774 if (sender_address[0] == 0)
2775 {
2776 uschar *fromstart, *fromend;
2777
2778 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2779 oname, (oname[0] == 0)? "" : " <");
2780 fromend = (oname[0] == 0)? US"" : US">";
2781
2782 if (sender_local || local_error_message)
2783 {
2784 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2785 local_part_quote(originator_login), qualify_domain_sender,
2786 fromend);
2787 }
2788 else if (submission_mode && authenticated_id != NULL)
2789 {
2790 if (submission_domain == NULL)
2791 {
2792 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2793 local_part_quote(authenticated_id), qualify_domain_sender,
2794 fromend);
2795 }
2796 else if (submission_domain[0] == 0) /* empty => whole address set */
2797 {
2798 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2799 fromend);
2800 }
2801 else
2802 {
2803 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2804 local_part_quote(authenticated_id), submission_domain,
2805 fromend);
2806 }
2807 from_header = header_last; /* To get it checked for Sender: */
2808 }
2809 }
2810
2811 /* There is a non-null envelope sender. Build the header using the original
2812 sender address, before any rewriting that might have been done while
2813 verifying it. */
2814
2815 else
2816 {
2817 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2818 oname,
2819 (oname[0] == 0)? "" : " <",
2820 (sender_address_unrewritten == NULL)?
2821 sender_address : sender_address_unrewritten,
2822 (oname[0] == 0)? "" : ">");
2823
2824 from_header = header_last; /* To get it checked for Sender: */
2825 }
2826 }
2827
2828
2829 /* If the sender is local (without suppress_local_fixups), or if we are in
2830 submission mode and there is an authenticated_id, check that an existing From:
2831 is correct, and if not, generate a Sender: header, unless disabled. Any
2832 previously-existing Sender: header was removed above. Note that sender_local,
2833 as well as being TRUE if the caller of exim is not trusted, is also true if a
2834 trusted caller did not supply a -f argument for non-smtp input. To allow
2835 trusted callers to forge From: without supplying -f, we have to test explicitly
2836 here. If the From: header contains more than one address, then the call to
2837 parse_extract_address fails, and a Sender: header is inserted, as required. */
2838
2839 if (from_header != NULL &&
2840 (active_local_from_check &&
2841 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2842 (submission_mode && authenticated_id != NULL))
2843 ))
2844 {
2845 BOOL make_sender = TRUE;
2846 int start, end, domain;
2847 uschar *errmess;
2848 uschar *from_address =
2849 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2850 &start, &end, &domain, FALSE);
2851 uschar *generated_sender_address;
2852
2853 if (submission_mode)
2854 {
2855 if (submission_domain == NULL)
2856 {
2857 generated_sender_address = string_sprintf("%s@%s",
2858 local_part_quote(authenticated_id), qualify_domain_sender);
2859 }
2860 else if (submission_domain[0] == 0) /* empty => full address */
2861 {
2862 generated_sender_address = string_sprintf("%s",
2863 authenticated_id);
2864 }
2865 else
2866 {
2867 generated_sender_address = string_sprintf("%s@%s",
2868 local_part_quote(authenticated_id), submission_domain);
2869 }
2870 }
2871 else
2872 generated_sender_address = string_sprintf("%s@%s",
2873 local_part_quote(originator_login), qualify_domain_sender);
2874
2875 /* Remove permitted prefixes and suffixes from the local part of the From:
2876 address before doing the comparison with the generated sender. */
2877
2878 if (from_address != NULL)
2879 {
2880 int slen;
2881 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2882
2883 if (at != NULL) *at = 0;
2884 from_address += route_check_prefix(from_address, local_from_prefix);
2885 slen = route_check_suffix(from_address, local_from_suffix);
2886 if (slen > 0)
2887 {
2888 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2889 from_address += slen;
2890 }
2891 if (at != NULL) *at = '@';
2892
2893 if (strcmpic(generated_sender_address, from_address) == 0 ||
2894 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2895 make_sender = FALSE;
2896 }
2897
2898 /* We have to cause the Sender header to be rewritten if there are
2899 appropriate rewriting rules. */
2900
2901 if (make_sender)
2902 {
2903 if (submission_mode && submission_name == NULL)
2904 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2905 generated_sender_address);
2906 else
2907 header_add(htype_sender, "%sSender: %s <%s>\n",
2908 resent_prefix,
2909 submission_mode? submission_name : originator_name,
2910 generated_sender_address);
2911 }
2912
2913 /* Ensure that a non-null envelope sender address corresponds to the
2914 submission mode sender address. */
2915
2916 if (submission_mode && sender_address[0] != 0)
2917 {
2918 if (sender_address_unrewritten == NULL)
2919 sender_address_unrewritten = sender_address;
2920 sender_address = generated_sender_address;
2921 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2922 log_write(L_address_rewrite, LOG_MAIN,
2923 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2924 sender_address_unrewritten, generated_sender_address);
2925 }
2926 }
2927
2928 /* If there are any rewriting rules, apply them to the sender address, unless
2929 it has already been rewritten as part of verification for SMTP input. */
2930
2931 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2932 sender_address[0] != 0)
2933 {
2934 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2935 global_rewrite_rules, rewrite_existflags);
2936 DEBUG(D_receive|D_rewrite)
2937 debug_printf("rewritten sender = %s\n", sender_address);
2938 }
2939
2940
2941 /* The headers must be run through rewrite_header(), because it ensures that
2942 addresses are fully qualified, as well as applying any rewriting rules that may
2943 exist.
2944
2945 Qualification of header addresses in a message from a remote host happens only
2946 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2947 appropriate. For local messages, qualification always happens, unless -bnq is
2948 used to explicitly suppress it. No rewriting is done for an unqualified address
2949 that is left untouched.
2950
2951 We start at the second header, skipping our own Received:. This rewriting is
2952 documented as happening *after* recipient addresses are taken from the headers
2953 by the -t command line option. An added Sender: gets rewritten here. */
2954
2955 for (h = header_list->next; h; h = h->next)
2956 {
2957 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2958 rewrite_existflags, TRUE);
2959 if (newh) h = newh;
2960 }
2961
2962
2963 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2964 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2965 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2966 exists, this applies to the set of resent- headers rather than the normal set.
2967
2968 The requirement for a recipient header has been removed in RFC 2822. At this
2969 point in the code, earlier versions of Exim added a To: header for locally
2970 submitted messages, and an empty Bcc: header for others. In the light of the
2971 changes in RFC 2822, this was dropped in November 2003. */
2972
2973
2974 /* If there is no date header, generate one if the message originates locally
2975 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2976 submission mode flag is set. Messages without Date: are not valid, but it seems
2977 to be more confusing if Exim adds one to all remotely-originated messages.
2978 As per Message-Id, we prepend if resending, else append.
2979 */
2980
2981 if (!date_header_exists &&
2982 ((sender_host_address == NULL && !suppress_local_fixups)
2983 || submission_mode))
2984 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2985 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2986
2987 search_tidyup(); /* Free any cached resources */
2988
2989 /* Show the complete set of headers if debugging. Note that the first one (the
2990 new Received:) has not yet been set. */
2991
2992 DEBUG(D_receive)
2993 {
2994 debug_printf(">>Headers after rewriting and local additions:\n");
2995 for (h = header_list->next; h != NULL; h = h->next)
2996 debug_printf("%c %s", h->type, h->text);
2997 debug_printf("\n");
2998 }
2999
3000 /* The headers are now complete in store. If we are running in filter
3001 testing mode, that is all this function does. Return TRUE if the message
3002 ended with a dot. */
3003
3004 if (filter_test != FTEST_NONE)
3005 {
3006 process_info[process_info_len] = 0;
3007 return message_ended == END_DOT;
3008 }
3009
3010 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3011 think more if it could be handled. Cannot do onward CHUNKING unless
3012 inbound is, but inbound chunking ought to be ok with outbound plain.
3013 Could we do onward CHUNKING given inbound CHUNKING?
3014 */
3015 if (chunking_state > CHUNKING_OFFERED)
3016 cancel_cutthrough_connection(FALSE, US"chunking active");
3017
3018 /* Cutthrough delivery:
3019 We have to create the Received header now rather than at the end of reception,
3020 so the timestamp behaviour is a change to the normal case.
3021 Having created it, send the headers to the destination. */
3022
3023 if (cutthrough.fd >= 0 && cutthrough.delivery)
3024 {
3025 if (received_count > received_headers_max)
3026 {
3027 cancel_cutthrough_connection(TRUE, US"too many headers");
3028 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3029 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3030 "Too many \"Received\" headers",
3031 sender_address,
3032 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3033 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3034 message_id[0] = 0; /* Indicate no message accepted */
3035 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3036 goto TIDYUP; /* Skip to end of function */
3037 }
3038 received_header_gen();
3039 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3040 (void) cutthrough_headers_send();
3041 }
3042
3043
3044 /* Open a new spool file for the data portion of the message. We need
3045 to access it both via a file descriptor and a stream. Try to make the
3046 directory if it isn't there. */
3047
3048 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3049 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3050
3051 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3052 {
3053 if (errno == ENOENT)
3054 {
3055 (void) directory_make(spool_directory,
3056 spool_sname(US"input", message_subdir),
3057 INPUT_DIRECTORY_MODE, TRUE);
3058 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3059 }
3060 if (data_fd < 0)
3061 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3062 spool_name, strerror(errno));
3063 }
3064
3065 /* Make sure the file's group is the Exim gid, and double-check the mode
3066 because the group setting doesn't always get set automatically. */
3067
3068 if (fchown(data_fd, exim_uid, exim_gid))
3069 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3070 "Failed setting ownership on spool file %s: %s",
3071 spool_name, strerror(errno));
3072 (void)fchmod(data_fd, SPOOL_MODE);
3073
3074 /* We now have data file open. Build a stream for it and lock it. We lock only
3075 the first line of the file (containing the message ID) because otherwise there
3076 are problems when Exim is run under Cygwin (I'm told). See comments in
3077 spool_in.c, where the same locking is done. */
3078
3079 data_file = fdopen(data_fd, "w+");
3080 lock_data.l_type = F_WRLCK;
3081 lock_data.l_whence = SEEK_SET;
3082 lock_data.l_start = 0;
3083 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3084
3085 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3086 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3087 errno, strerror(errno));
3088
3089 /* We have an open, locked data file. Write the message id to it to make it
3090 self-identifying. Then read the remainder of the input of this message and
3091 write it to the data file. If the variable next != NULL, it contains the first
3092 data line (which was read as a header but then turned out not to have the right
3093 format); write it (remembering that it might contain binary zeros). The result
3094 of fwrite() isn't inspected; instead we call ferror() below. */
3095
3096 fprintf(data_file, "%s-D\n", message_id);
3097 if (next != NULL)
3098 {
3099 uschar *s = next->text;
3100 int len = next->slen;
3101 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3102 body_linecount++; /* Assumes only 1 line */
3103 }
3104
3105 /* Note that we might already be at end of file, or the logical end of file
3106 (indicated by '.'), or might have encountered an error while writing the
3107 message id or "next" line. */
3108
3109 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3110 {
3111 if (smtp_input)
3112 {
3113 message_ended = chunking_state <= CHUNKING_OFFERED
3114 ? read_message_data_smtp(data_file)
3115 : spool_wireformat
3116 ? read_message_bdat_smtp_wire(data_file)
3117 : read_message_bdat_smtp(data_file);
3118 receive_linecount++; /* The terminating "." line */
3119 }
3120 else message_ended = read_message_data(data_file);
3121
3122 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3123 message_linecount += body_linecount;
3124
3125 switch (message_ended)
3126 {
3127 /* Handle premature termination of SMTP */
3128
3129 case END_EOF:
3130 if (smtp_input)
3131 {
3132 Uunlink(spool_name); /* Lose data file when closed */
3133 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3134 message_id[0] = 0; /* Indicate no message accepted */
3135 smtp_reply = handle_lost_connection(US"");
3136 smtp_yield = FALSE;
3137 goto TIDYUP; /* Skip to end of function */
3138 }
3139 break;
3140
3141 /* Handle message that is too big. Don't use host_or_ident() in the log
3142 message; we want to see the ident value even for non-remote messages. */
3143
3144 case END_SIZE:
3145 Uunlink(spool_name); /* Lose the data file when closed */
3146 cancel_cutthrough_connection(TRUE, US"mail too big");
3147 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3148
3149 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3150 "message too big: read=%d max=%d",
3151 sender_address,
3152 (sender_fullhost == NULL)? "" : " H=",
3153 (sender_fullhost == NULL)? US"" : sender_fullhost,
3154 (sender_ident == NULL)? "" : " U=",
3155 (sender_ident == NULL)? US"" : sender_ident,
3156 message_size,
3157 thismessage_size_limit);
3158
3159 if (smtp_input)
3160 {
3161 smtp_reply = US"552 Message size exceeds maximum permitted";
3162 message_id[0] = 0; /* Indicate no message accepted */
3163 goto TIDYUP; /* Skip to end of function */
3164 }
3165 else
3166 {
3167 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3168 give_local_error(ERRMESS_TOOBIG,
3169 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3170 US"message rejected: ", error_rc, data_file, header_list);
3171 /* Does not return */
3172 }
3173 break;
3174
3175 /* Handle bad BDAT protocol sequence */
3176
3177 case END_PROTOCOL:
3178 Uunlink(spool_name); /* Lose the data file when closed */
3179 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3180 smtp_reply = US""; /* Response already sent */
3181 message_id[0] = 0; /* Indicate no message accepted */
3182 goto TIDYUP; /* Skip to end of function */
3183 }
3184 }
3185
3186 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3187 example, there may be some expansion in an ACL that uses a timer.) */
3188
3189 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3190
3191 /* The message body has now been read into the data file. Call fflush() to
3192 empty the buffers in C, and then call fsync() to get the data written out onto
3193 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3194 having to do this). If there was an I/O error on either input or output,
3195 attempt to send an error message, and unlink the spool file. For non-SMTP input
3196 we can then give up. Note that for SMTP input we must swallow the remainder of
3197 the input in cases of output errors, since the far end doesn't expect to see
3198 anything until the terminating dot line is sent. */
3199
3200 if (fflush(data_file) == EOF || ferror(data_file) ||
3201 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3202 {
3203 uschar *msg_errno = US strerror(errno);
3204 BOOL input_error = (receive_ferror)() != 0;
3205 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3206 input_error? "Input read" : "Spool write",
3207 msg_errno,
3208 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3209
3210 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3211 Uunlink(spool_name); /* Lose the data file */
3212 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3213
3214 if (smtp_input)
3215 {
3216 if (input_error)
3217 smtp_reply = US"451 Error while reading input data";
3218 else
3219 {
3220 smtp_reply = US"451 Error while writing spool file";
3221 receive_swallow_smtp();
3222 }
3223 message_id[0] = 0; /* Indicate no message accepted */
3224 goto TIDYUP; /* Skip to end of function */
3225 }
3226
3227 else
3228 {
3229 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3230 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3231 header_list);
3232 /* Does not return */
3233 }
3234 }
3235
3236
3237 /* No I/O errors were encountered while writing the data file. */
3238
3239 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3240
3241
3242 /* If there were any bad addresses extracted by -t, or there were no recipients
3243 left after -t, send a message to the sender of this message, or write it to
3244 stderr if the error handling option is set that way. Note that there may
3245 legitimately be no recipients for an SMTP message if they have all been removed
3246 by "discard".
3247
3248 We need to rewind the data file in order to read it. In the case of no
3249 recipients or stderr error writing, throw the data file away afterwards, and
3250 exit. (This can't be SMTP, which always ensures there's at least one
3251 syntactically good recipient address.) */
3252
3253 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3254 {
3255 DEBUG(D_receive)
3256 {
3257 if (recipients_count == 0) debug_printf("*** No recipients\n");
3258 if (bad_addresses != NULL)
3259 {
3260 error_block *eblock = bad_addresses;
3261 debug_printf("*** Bad address(es)\n");
3262 while (eblock != NULL)
3263 {
3264 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3265 eblock = eblock->next;
3266 }
3267 }
3268 }
3269
3270 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3271
3272 /* If configured to send errors to the sender, but this fails, force
3273 a failure error code. We use a special one for no recipients so that it
3274 can be detected by the autoreply transport. Otherwise error_rc is set to
3275 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3276 it is EXIT_SUCCESS. */
3277
3278 if (error_handling == ERRORS_SENDER)
3279 {
3280 if (!moan_to_sender(
3281 (bad_addresses == NULL)?
3282 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3283 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3284 bad_addresses, header_list, data_file, FALSE))
3285 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3286 }
3287 else
3288 {
3289 if (bad_addresses == NULL)
3290 {
3291 if (extracted_ignored)
3292 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3293 else
3294 fprintf(stderr, "exim: no recipients in message\n");
3295 }
3296 else
3297 {
3298 fprintf(stderr, "exim: invalid address%s",
3299 (bad_addresses->next == NULL)? ":" : "es:\n");
3300 while (bad_addresses != NULL)
3301 {
3302 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3303 bad_addresses->text2);
3304 bad_addresses = bad_addresses->next;
3305 }
3306 }
3307 }
3308
3309 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3310 {
3311 Uunlink(spool_name);
3312 (void)fclose(data_file);
3313 exim_exit(error_rc, US"receiving");
3314 }
3315 }
3316
3317 /* Data file successfully written. Generate text for the Received: header by
3318 expanding the configured string, and adding a timestamp. By leaving this
3319 operation till now, we ensure that the timestamp is the time that message
3320 reception was completed. However, this is deliberately done before calling the
3321 data ACL and local_scan().
3322
3323 This Received: header may therefore be inspected by the data ACL and by code in
3324 the local_scan() function. When they have run, we update the timestamp to be
3325 the final time of reception.
3326
3327 If there is just one recipient, set up its value in the $received_for variable
3328 for use when we generate the Received: header.
3329
3330 Note: the checking for too many Received: headers is handled by the delivery
3331 code. */
3332 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3333
3334 if (received_header->text == NULL) /* Non-cutthrough case */
3335 {
3336 received_header_gen();
3337
3338 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3339
3340 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3341 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3342
3343 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3344 now, before running the DATA ACL. */
3345
3346 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3347 }
3348 else
3349 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3350 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3351
3352 /* If an ACL is specified for checking things at this stage of reception of a
3353 message, run it, unless all the recipients were removed by "discard" in earlier
3354 ACLs. That is the only case in which recipients_count can be zero at this
3355 stage. Set deliver_datafile to point to the data file so that $message_body and
3356 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3357 */
3358
3359 deliver_datafile = data_fd;
3360 user_msg = NULL;
3361
3362 enable_dollar_recipients = TRUE;
3363
3364 if (recipients_count == 0)
3365 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3366
3367 else
3368 {
3369 /* Handle interactive SMTP messages */
3370
3371 if (smtp_input && !smtp_batched_input)
3372 {
3373
3374 #ifndef DISABLE_DKIM
3375 if (!dkim_disable_verify)
3376 {
3377 /* Finish verification */
3378 dkim_exim_verify_finish();
3379
3380 /* Check if we must run the DKIM ACL */
3381 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3382 {
3383 uschar * dkim_verify_signers_expanded =
3384 expand_string(dkim_verify_signers);
3385 gstring * results = NULL;
3386 int signer_sep = 0;
3387 const uschar * ptr;
3388 uschar * item;
3389 gstring * seen_items = NULL;
3390 int old_pool = store_pool;
3391
3392 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3393
3394 if (!(ptr = dkim_verify_signers_expanded))
3395 log_write(0, LOG_MAIN|LOG_PANIC,
3396 "expansion of dkim_verify_signers option failed: %s",
3397 expand_string_message);
3398
3399 /* Default to OK when no items are present */
3400 rc = OK;
3401 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3402 {
3403 /* Prevent running ACL for an empty item */
3404 if (!item || !*item) continue;
3405
3406 /* Only run ACL once for each domain or identity,
3407 no matter how often it appears in the expanded list. */
3408 if (seen_items)
3409 {
3410 uschar * seen_item;
3411 const uschar * seen_items_list = string_from_gstring(seen_items);
3412 int seen_sep = ':';
3413 BOOL seen_this_item = FALSE;
3414
3415 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3416 NULL, 0)))
3417 if (Ustrcmp(seen_item,item) == 0)
3418 {
3419 seen_this_item = TRUE;
3420 break;
3421 }
3422
3423 if (seen_this_item)
3424 {
3425 DEBUG(D_receive)
3426 debug_printf("acl_smtp_dkim: skipping signer %s, "
3427 "already seen\n", item);
3428 continue;
3429 }
3430
3431 seen_items = string_catn(seen_items, US":", 1);
3432 }
3433 seen_items = string_cat(seen_items, item);
3434
3435 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3436 if (rc != OK)
3437 {
3438 DEBUG(D_receive)
3439 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3440 "skipping remaining items\n", rc, item);
3441 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3442 break;
3443 }
3444 }
3445 dkim_verify_status = string_from_gstring(results);
3446 store_pool = old_pool;
3447 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3448 if (rc == DISCARD)
3449 {
3450 recipients_count = 0;
3451 blackholed_by = US"DKIM ACL";
3452 if (log_msg)
3453 blackhole_log_msg = string_sprintf(": %s", log_msg);
3454 }
3455 else if (rc != OK)
3456 {
3457 Uunlink(spool_name);
3458 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3459 smtp_yield = FALSE; /* No more messages after dropped connection */
3460 smtp_reply = US""; /* Indicate reply already sent */
3461 message_id[0] = 0; /* Indicate no message accepted */
3462 goto TIDYUP; /* Skip to end of function */
3463 }
3464 }
3465 else
3466 dkim_exim_verify_log_all();
3467 }
3468 #endif /* DISABLE_DKIM */
3469
3470 #ifdef WITH_CONTENT_SCAN
3471 if ( recipients_count > 0
3472 && acl_smtp_mime
3473 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3474 )
3475 goto TIDYUP;
3476 #endif /* WITH_CONTENT_SCAN */
3477
3478 #ifdef EXPERIMENTAL_DMARC
3479 dmarc_up = dmarc_store_data(from_header);
3480 #endif /* EXPERIMENTAL_DMARC */
3481
3482 #ifndef DISABLE_PRDR
3483 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3484 {
3485 unsigned int c;
3486 int all_pass = OK;
3487 int all_fail = FAIL;
3488
3489 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3490 /* Loop through recipients, responses must be in same order received */
3491 for (c = 0; recipients_count > c; c++)
3492 {
3493 uschar * addr= recipients_list[c].address;
3494 uschar * msg= US"PRDR R=<%s> %s";
3495 uschar * code;
3496 DEBUG(D_receive)
3497 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3498 addr, c+1, recipients_count);
3499 rc = acl_check(ACL_WHERE_PRDR, addr,