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