Logging: fix DKIM precis received log line element.
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 /* Code for receiving a message and setting up spool files. */
9
10 #include "exim.h"
11
12 #ifdef EXPERIMENTAL_DCC
13 extern int dcc_ok;
14 #endif
15
16 #ifdef EXPERIMENTAL_DMARC
17 # include "dmarc.h"
18 #endif /* EXPERIMENTAL_DMARC */
19
20 /*************************************************
21 * Local static variables *
22 *************************************************/
23
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
27
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
29
30
31 /*************************************************
32 * Non-SMTP character reading functions *
33 *************************************************/
34
35 /* These are the default functions that are set up in the variables such as
36 receive_getc initially. They just call the standard functions, passing stdin as
37 the file. (When SMTP input is occurring, different functions are used by
38 changing the pointer variables.) */
39
40 int
41 stdin_getc(unsigned lim)
42 {
43 return getc(stdin);
44 }
45
46 int
47 stdin_ungetc(int c)
48 {
49 return ungetc(c, stdin);
50 }
51
52 int
53 stdin_feof(void)
54 {
55 return feof(stdin);
56 }
57
58 int
59 stdin_ferror(void)
60 {
61 return ferror(stdin);
62 }
63
64
65
66
67 /*************************************************
68 * Check that a set sender is allowed *
69 *************************************************/
70
71 /* This function is called when a local caller sets an explicit sender address.
72 It checks whether this is permitted, which it is for trusted callers.
73 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74
75 Arguments: the proposed sender address
76 Returns: TRUE for a trusted caller
77 TRUE if the address has been set, untrusted_set_sender has been
78 set, and the address matches something in the list
79 FALSE otherwise
80 */
81
82 BOOL
83 receive_check_set_sender(uschar *newsender)
84 {
85 uschar *qnewsender;
86 if (trusted_caller) return TRUE;
87 if (!newsender || !untrusted_set_sender) return FALSE;
88 qnewsender = Ustrchr(newsender, '@')
89 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
91 }
92
93
94
95
96 /*************************************************
97 * Read space info for a partition *
98 *************************************************/
99
100 /* This function is called by receive_check_fs() below, and also by string
101 expansion for variables such as $spool_space. The field names for the statvfs
102 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
103 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
104 have inodes, and they return -1 for the number available.
105
106 Later: It turns out that some file systems that do not have the concept of
107 inodes return 0 rather than -1. Such systems should also return 0 for the total
108 number of inodes, so we require that to be greater than zero before returning
109 an inode count.
110
111 Arguments:
112 isspool TRUE for spool partition, FALSE for log partition
113 inodeptr address of int to receive inode count; -1 if there isn't one
114
115 Returns: available on-root space, in kilobytes
116 -1 for log partition if there isn't one
117
118 All values are -1 if the STATFS functions are not available.
119 */
120
121 int
122 receive_statvfs(BOOL isspool, int *inodeptr)
123 {
124 #ifdef HAVE_STATFS
125 struct STATVFS statbuf;
126 struct stat dummy;
127 uschar *path;
128 uschar *name;
129 uschar buffer[1024];
130
131 /* The spool directory must always exist. */
132
133 if (isspool)
134 {
135 path = spool_directory;
136 name = US"spool";
137 }
138
139 /* Need to cut down the log file path to the directory, and to ignore any
140 appearance of "syslog" in it. */
141
142 else
143 {
144 int sep = ':'; /* Not variable - outside scripts use */
145 const uschar *p = log_file_path;
146 name = US"log";
147
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
150
151 if (*p == 0) p = US":";
152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
153 if (Ustrcmp(path, "syslog") != 0)
154 break;
155
156 if (path == NULL) /* No log files */
157 {
158 *inodeptr = -1;
159 return -1;
160 }
161
162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
164 subdirectory has been symbolically linked elsewhere. */
165
166 if (path[0] == 0)
167 {
168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
169 path = buffer;
170 }
171 else
172 {
173 uschar *cp;
174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
175 }
176 }
177
178 /* We now have the path; do the business */
179
180 memset(&statbuf, 0, sizeof(statbuf));
181
182 if (STATVFS(CS path, &statbuf) != 0)
183 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
184 { /* Can happen on first run after installation */
185 *inodeptr = -1;
186 return -1;
187 }
188 else
189 {
190 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
191 "%s directory %s: %s", name, path, strerror(errno));
192 smtp_closedown(US"spool or log directory problem");
193 exim_exit(EXIT_FAILURE, NULL);
194 }
195
196 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
197
198 /* Disks are getting huge. Take care with computing the size in kilobytes. */
199
200 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
201
202 #else
203 /* Unable to find partition sizes in this environment. */
204
205 *inodeptr = -1;
206 return -1;
207 #endif
208 }
209
210
211
212
213 /*************************************************
214 * Check space on spool and log partitions *
215 *************************************************/
216
217 /* This function is called before accepting a message; if any thresholds are
218 set, it checks them. If a message_size is supplied, it checks that there is
219 enough space for that size plus the threshold - i.e. that the message won't
220 reduce the space to the threshold. Not all OS have statvfs(); for those that
221 don't, this function always returns TRUE. For some OS the old function and
222 struct name statfs is used; that is handled by a macro, defined in exim.h.
223
224 Arguments:
225 msg_size the (estimated) size of an incoming message
226
227 Returns: FALSE if there isn't enough space, or if the information cannot
228 be obtained
229 TRUE if no check was done or there is enough space
230 */
231
232 BOOL
233 receive_check_fs(int msg_size)
234 {
235 int space, inodes;
236
237 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
238 {
239 space = receive_statvfs(TRUE, &inodes);
240
241 DEBUG(D_receive)
242 debug_printf("spool directory space = %dK inodes = %d "
243 "check_space = %dK inodes = %d msg_size = %d\n",
244 space, inodes, check_spool_space, check_spool_inodes, msg_size);
245
246 if ((space >= 0 && space < check_spool_space) ||
247 (inodes >= 0 && inodes < check_spool_inodes))
248 {
249 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
250 "inodes=%d", space, inodes);
251 return FALSE;
252 }
253 }
254
255 if (check_log_space > 0 || check_log_inodes > 0)
256 {
257 space = receive_statvfs(FALSE, &inodes);
258
259 DEBUG(D_receive)
260 debug_printf("log directory space = %dK inodes = %d "
261 "check_space = %dK inodes = %d\n",
262 space, inodes, check_log_space, check_log_inodes);
263
264 if ((space >= 0 && space < check_log_space) ||
265 (inodes >= 0 && inodes < check_log_inodes))
266 {
267 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
268 "inodes=%d", space, inodes);
269 return FALSE;
270 }
271 }
272
273 return TRUE;
274 }
275
276
277
278 /*************************************************
279 * Bomb out while reading a message *
280 *************************************************/
281
282 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
283 received, or if there is a timeout. A rarer case might be if the log files are
284 screwed up and Exim can't open them to record a message's arrival. Handling
285 that case is done by setting a flag to cause the log functions to call this
286 function if there is an ultimate disaster. That is why it is globally
287 accessible.
288
289 Arguments:
290 reason text reason to pass to the not-quit ACL
291 msg default SMTP response to give if in an SMTP session
292 Returns: it doesn't
293 */
294
295 void
296 receive_bomb_out(uschar *reason, uschar *msg)
297 {
298 static BOOL already_bombing_out;
299 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
300 timeouts, if someone has something slow in their quit ACL. Since the only
301 things we should be doing are to close down cleanly ASAP, on the second
302 pass we also close down stuff that might be opened again, before bypassing
303 the ACL call and exiting. */
304
305 /* If spool_name is set, it contains the name of the data file that is being
306 written. Unlink it before closing so that it cannot be picked up by a delivery
307 process. Ensure that any header file is also removed. */
308
309 if (spool_name[0] != '\0')
310 {
311 Uunlink(spool_name);
312 spool_name[Ustrlen(spool_name) - 1] = 'H';
313 Uunlink(spool_name);
314 spool_name[0] = '\0';
315 }
316
317 /* Now close the file if it is open, either as a fd or a stream. */
318
319 if (data_file != NULL)
320 {
321 (void)fclose(data_file);
322 data_file = NULL;
323 } else if (data_fd >= 0) {
324 (void)close(data_fd);
325 data_fd = -1;
326 }
327
328 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
329 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
330 SMTP response. */
331
332 if (!already_bombing_out)
333 {
334 already_bombing_out = TRUE;
335 if (smtp_input)
336 {
337 if (smtp_batched_input)
338 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
339 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
340 smtp_active_hostname, msg);
341 }
342 }
343
344 /* Exit from the program (non-BSMTP cases) */
345
346 exim_exit(EXIT_FAILURE, NULL);
347 }
348
349
350 /*************************************************
351 * Data read timeout *
352 *************************************************/
353
354 /* Handler function for timeouts that occur while reading the data that
355 comprises a message.
356
357 Argument: the signal number
358 Returns: nothing
359 */
360
361 static void
362 data_timeout_handler(int sig)
363 {
364 uschar *msg = NULL;
365
366 sig = sig; /* Keep picky compilers happy */
367
368 if (smtp_input)
369 {
370 msg = US"SMTP incoming data timeout";
371 log_write(L_lost_incoming_connection,
372 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
373 "from %s F=<%s>",
374 (sender_fullhost != NULL)? sender_fullhost : US"local process",
375 sender_address);
376 }
377 else
378 {
379 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
380 log_write(L_lost_incoming_connection,
381 LOG_MAIN, "timed out while reading local message");
382 }
383
384 receive_bomb_out(US"data-timeout", msg); /* Does not return */
385 }
386
387
388
389 /*************************************************
390 * local_scan() timeout *
391 *************************************************/
392
393 /* Handler function for timeouts that occur while running a local_scan()
394 function.
395
396 Argument: the signal number
397 Returns: nothing
398 */
399
400 static void
401 local_scan_timeout_handler(int sig)
402 {
403 sig = sig; /* Keep picky compilers happy */
404 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
405 "message temporarily rejected (size %d)", message_size);
406 /* Does not return */
407 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
408 }
409
410
411
412 /*************************************************
413 * local_scan() crashed *
414 *************************************************/
415
416 /* Handler function for signals that occur while running a local_scan()
417 function.
418
419 Argument: the signal number
420 Returns: nothing
421 */
422
423 static void
424 local_scan_crash_handler(int sig)
425 {
426 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
427 "signal %d - message temporarily rejected (size %d)", sig, message_size);
428 /* Does not return */
429 receive_bomb_out(US"local-scan-error", US"local verification problem");
430 }
431
432
433 /*************************************************
434 * SIGTERM or SIGINT received *
435 *************************************************/
436
437 /* Handler for SIGTERM or SIGINT signals that occur while reading the
438 data that comprises a message.
439
440 Argument: the signal number
441 Returns: nothing
442 */
443
444 static void
445 data_sigterm_sigint_handler(int sig)
446 {
447 uschar *msg = NULL;
448
449 if (smtp_input)
450 {
451 msg = US"Service not available - SIGTERM or SIGINT received";
452 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
453 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
454 }
455 else
456 {
457 if (filter_test == FTEST_NONE)
458 {
459 fprintf(stderr, "\nexim: %s received - message abandoned\n",
460 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
461 log_write(0, LOG_MAIN, "%s received while reading local message",
462 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
463 }
464 }
465
466 receive_bomb_out(US"signal-exit", msg); /* Does not return */
467 }
468
469
470
471 /*************************************************
472 * Add new recipient to list *
473 *************************************************/
474
475 /* This function builds a list of recipient addresses in argc/argv
476 format.
477
478 Arguments:
479 recipient the next address to add to recipients_list
480 pno parent number for fixed aliases; -1 otherwise
481
482 Returns: nothing
483 */
484
485 void
486 receive_add_recipient(uschar *recipient, int pno)
487 {
488 if (recipients_count >= recipients_list_max)
489 {
490 recipient_item *oldlist = recipients_list;
491 int oldmax = recipients_list_max;
492 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
493 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
494 if (oldlist != NULL)
495 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
496 }
497
498 recipients_list[recipients_count].address = recipient;
499 recipients_list[recipients_count].pno = pno;
500 #ifdef EXPERIMENTAL_BRIGHTMAIL
501 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
502 /* reset optin string pointer for next recipient */
503 bmi_current_optin = NULL;
504 #endif
505 recipients_list[recipients_count].orcpt = NULL;
506 recipients_list[recipients_count].dsn_flags = 0;
507 recipients_list[recipients_count++].errors_to = NULL;
508 }
509
510
511
512
513 /*************************************************
514 * Send user response message *
515 *************************************************/
516
517 /* This function is passed a default response code and a user message. It calls
518 smtp_message_code() to check and possibly modify the response code, and then
519 calls smtp_respond() to transmit the response. I put this into a function
520 just to avoid a lot of repetition.
521
522 Arguments:
523 code the response code
524 user_msg the user message
525
526 Returns: nothing
527 */
528
529 #ifndef DISABLE_PRDR
530 static void
531 smtp_user_msg(uschar *code, uschar *user_msg)
532 {
533 int len = 3;
534 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
535 smtp_respond(code, len, TRUE, user_msg);
536 }
537 #endif
538
539
540
541
542
543 /*************************************************
544 * Remove a recipient from the list *
545 *************************************************/
546
547 /* This function is provided for local_scan() to use.
548
549 Argument:
550 recipient address to remove
551
552 Returns: TRUE if it did remove something; FALSE otherwise
553 */
554
555 BOOL
556 receive_remove_recipient(uschar *recipient)
557 {
558 int count;
559 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
560 recipient);
561 for (count = 0; count < recipients_count; count++)
562 {
563 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
564 {
565 if ((--recipients_count - count) > 0)
566 memmove(recipients_list + count, recipients_list + count + 1,
567 (recipients_count - count)*sizeof(recipient_item));
568 return TRUE;
569 }
570 }
571 return FALSE;
572 }
573
574
575
576
577
578 /*************************************************
579 * Read data portion of a non-SMTP message *
580 *************************************************/
581
582 /* This function is called to read the remainder of a message (following the
583 header) when the input is not from SMTP - we are receiving a local message on
584 a standard input stream. The message is always terminated by EOF, and is also
585 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
586 two cases for maximum efficiency.
587
588 Ensure that the body ends with a newline. This will naturally be the case when
589 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
590 as "sequences of lines" - this of course strictly applies only to SMTP, but
591 deliveries into BSD-type mailbox files also require it. Exim used to have a
592 flag for doing this at delivery time, but as it was always set for all
593 transports, I decided to simplify things by putting the check here instead.
594
595 There is at least one MUA (dtmail) that sends CRLF via this interface, and
596 other programs are known to do this as well. Exim used to have a option for
597 dealing with this: in July 2003, after much discussion, the code has been
598 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
599
600 However, for the case when a dot on a line by itself terminates a message, the
601 only recognized terminating sequences before and after the dot are LF and CRLF.
602 Otherwise, having read EOL . CR, you don't know whether to read another
603 character or not.
604
605 Internally, in messages stored in Exim's spool files, LF is used as the line
606 terminator. Under the new regime, bare CRs will no longer appear in these
607 files.
608
609 Arguments:
610 fout a FILE to which to write the message
611
612 Returns: One of the END_xxx values indicating why it stopped reading
613 */
614
615 static int
616 read_message_data(FILE *fout)
617 {
618 int ch_state;
619 register int ch;
620 register int linelength = 0;
621
622 /* Handle the case when only EOF terminates the message */
623
624 if (!dot_ends)
625 {
626 register int last_ch = '\n';
627
628 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
629 {
630 if (ch == 0) body_zerocount++;
631 if (last_ch == '\r' && ch != '\n')
632 {
633 if (linelength > max_received_linelength)
634 max_received_linelength = linelength;
635 linelength = 0;
636 if (fputc('\n', fout) == EOF) return END_WERROR;
637 message_size++;
638 body_linecount++;
639 }
640 if (ch == '\r') continue;
641
642 if (fputc(ch, fout) == EOF) return END_WERROR;
643 if (ch == '\n')
644 {
645 if (linelength > max_received_linelength)
646 max_received_linelength = linelength;
647 linelength = 0;
648 body_linecount++;
649 }
650 else linelength++;
651 if (++message_size > thismessage_size_limit) return END_SIZE;
652 }
653
654 if (last_ch != '\n')
655 {
656 if (linelength > max_received_linelength)
657 max_received_linelength = linelength;
658 if (fputc('\n', fout) == EOF) return END_WERROR;
659 message_size++;
660 body_linecount++;
661 }
662
663 return END_EOF;
664 }
665
666 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
667
668 ch_state = 1;
669
670 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
671 {
672 if (ch == 0) body_zerocount++;
673 switch (ch_state)
674 {
675 case 0: /* Normal state (previous char written) */
676 if (ch == '\n')
677 {
678 body_linecount++;
679 if (linelength > max_received_linelength)
680 max_received_linelength = linelength;
681 linelength = -1;
682 ch_state = 1;
683 }
684 else if (ch == '\r')
685 { ch_state = 2; continue; }
686 break;
687
688 case 1: /* After written "\n" */
689 if (ch == '.') { ch_state = 3; continue; }
690 if (ch == '\r') { ch_state = 2; continue; }
691 if (ch == '\n') { body_linecount++; linelength = -1; }
692 else ch_state = 0;
693 break;
694
695 case 2:
696 body_linecount++; /* After unwritten "\r" */
697 if (linelength > max_received_linelength)
698 max_received_linelength = linelength;
699 if (ch == '\n')
700 {
701 ch_state = 1;
702 linelength = -1;
703 }
704 else
705 {
706 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
707 if (ch == '\r') continue;
708 ch_state = 0;
709 linelength = 0;
710 }
711 break;
712
713 case 3: /* After "\n." (\n written, dot not) */
714 if (ch == '\n') return END_DOT;
715 if (ch == '\r') { ch_state = 4; continue; }
716 message_size++;
717 linelength++;
718 if (fputc('.', fout) == EOF) return END_WERROR;
719 ch_state = 0;
720 break;
721
722 case 4: /* After "\n.\r" (\n written, rest not) */
723 if (ch == '\n') return END_DOT;
724 message_size += 2;
725 body_linecount++;
726 if (fputs(".\n", fout) == EOF) return END_WERROR;
727 if (ch == '\r') { ch_state = 2; continue; }
728 ch_state = 0;
729 break;
730 }
731
732 linelength++;
733 if (fputc(ch, fout) == EOF) return END_WERROR;
734 if (++message_size > thismessage_size_limit) return END_SIZE;
735 }
736
737 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
738 the message ends with a newline, and we must also write any characters that
739 were saved up while testing for an ending dot. */
740
741 if (ch_state != 1)
742 {
743 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
744 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
745 message_size += Ustrlen(ends[ch_state]);
746 body_linecount++;
747 }
748
749 return END_EOF;
750 }
751
752
753
754
755 /*************************************************
756 * Read data portion of an SMTP message *
757 *************************************************/
758
759 /* This function is called to read the remainder of an SMTP message (after the
760 headers), or to skip over it when an error has occurred. In this case, the
761 output file is passed as NULL.
762
763 If any line begins with a dot, that character is skipped. The input should only
764 be successfully terminated by CR LF . CR LF unless it is local (non-network)
765 SMTP, in which case the CRs are optional, but...
766
767 FUDGE: It seems that sites on the net send out messages with just LF
768 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
769 we make the CRs optional in all cases.
770
771 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
772 well, so that there are no CRs in spooled messages. However, the message
773 terminating dot is not recognized between two bare CRs.
774
775 Arguments:
776 fout a FILE to which to write the message; NULL if skipping
777
778 Returns: One of the END_xxx values indicating why it stopped reading
779 */
780
781 static int
782 read_message_data_smtp(FILE *fout)
783 {
784 int ch_state = 0;
785 int ch;
786 int linelength = 0;
787
788 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
789 {
790 if (ch == 0) body_zerocount++;
791 switch (ch_state)
792 {
793 case 0: /* After LF or CRLF */
794 if (ch == '.')
795 {
796 ch_state = 3;
797 continue; /* Don't ever write . after LF */
798 }
799 ch_state = 1;
800
801 /* Else fall through to handle as normal uschar. */
802
803 case 1: /* Normal state */
804 if (ch == '\n')
805 {
806 ch_state = 0;
807 body_linecount++;
808 if (linelength > max_received_linelength)
809 max_received_linelength = linelength;
810 linelength = -1;
811 }
812 else if (ch == '\r')
813 {
814 ch_state = 2;
815 continue;
816 }
817 break;
818
819 case 2: /* After (unwritten) CR */
820 body_linecount++;
821 if (linelength > max_received_linelength)
822 max_received_linelength = linelength;
823 linelength = -1;
824 if (ch == '\n')
825 {
826 ch_state = 0;
827 }
828 else
829 {
830 message_size++;
831 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
832 cutthrough_data_put_nl();
833 if (ch != '\r') ch_state = 1; else continue;
834 }
835 break;
836
837 case 3: /* After [CR] LF . */
838 if (ch == '\n')
839 return END_DOT;
840 if (ch == '\r')
841 {
842 ch_state = 4;
843 continue;
844 }
845 /* The dot was removed at state 3. For a doubled dot, here, reinstate
846 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
847 and to file below. */
848 if (ch == '.')
849 {
850 uschar c= ch;
851 cutthrough_data_puts(&c, 1);
852 }
853 ch_state = 1;
854 break;
855
856 case 4: /* After [CR] LF . CR */
857 if (ch == '\n') return END_DOT;
858 message_size++;
859 body_linecount++;
860 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
861 cutthrough_data_put_nl();
862 if (ch == '\r')
863 {
864 ch_state = 2;
865 continue;
866 }
867 ch_state = 1;
868 break;
869 }
870
871 /* Add the character to the spool file, unless skipping; then loop for the
872 next. */
873
874 message_size++;
875 linelength++;
876 if (fout)
877 {
878 if (fputc(ch, fout) == EOF) return END_WERROR;
879 if (message_size > thismessage_size_limit) return END_SIZE;
880 }
881 if(ch == '\n')
882 cutthrough_data_put_nl();
883 else
884 {
885 uschar c = ch;
886 cutthrough_data_puts(&c, 1);
887 }
888 }
889
890 /* Fall through here if EOF encountered. This indicates some kind of error,
891 since a correct message is terminated by [CR] LF . [CR] LF. */
892
893 return END_EOF;
894 }
895
896
897
898
899 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
900 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
901 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
902 body_linecount accounting for proper re-expansion for the wire, so use
903 a cut-down version of the state-machine above; we don't need to do leading-dot
904 detection and unstuffing.
905
906 Arguments:
907 fout a FILE to which to write the message; NULL if skipping;
908 must be open for both writing and reading.
909
910 Returns: One of the END_xxx values indicating why it stopped reading
911 */
912
913 static int
914 read_message_bdat_smtp(FILE *fout)
915 {
916 int linelength = 0, ch;
917 enum CH_STATE ch_state = LF_SEEN;
918 BOOL fix_nl = FALSE;
919
920 for(;;)
921 {
922 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
923 {
924 case EOF: return END_EOF;
925 case ERR: return END_PROTOCOL;
926 case EOD:
927 /* Nothing to get from the sender anymore. We check the last
928 character written to the spool.
929
930 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
931 If we would be strict, we would refuse such broken messages.
932 But we are liberal, so we fix it. It would be easy just to append
933 the "\n" to the spool.
934
935 But there are some more things (line counting, message size calculation and such),
936 that would need to be duplicated here. So we simply do some ungetc
937 trickery.
938 */
939 if (fout)
940 {
941 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
942 if (fgetc(fout) == '\n') return END_DOT;
943 }
944
945 if (linelength == -1) /* \r already seen (see below) */
946 {
947 DEBUG(D_receive) debug_printf("Add missing LF\n");
948 bdat_ungetc('\n');
949 continue;
950 }
951 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
952 bdat_ungetc('\r'); /* not even \r was seen */
953 fix_nl = TRUE;
954
955 continue;
956 case '\0': body_zerocount++; break;
957 }
958 switch (ch_state)
959 {
960 case LF_SEEN: /* After LF or CRLF */
961 ch_state = MID_LINE;
962 /* fall through to handle as normal uschar. */
963
964 case MID_LINE: /* Mid-line state */
965 if (ch == '\n')
966 {
967 ch_state = LF_SEEN;
968 body_linecount++;
969 if (linelength > max_received_linelength)
970 max_received_linelength = linelength;
971 linelength = -1;
972 }
973 else if (ch == '\r')
974 {
975 ch_state = CR_SEEN;
976 if (fix_nl) bdat_ungetc('\n');
977 continue; /* don't write CR */
978 }
979 break;
980
981 case CR_SEEN: /* After (unwritten) CR */
982 body_linecount++;
983 if (linelength > max_received_linelength)
984 max_received_linelength = linelength;
985 linelength = -1;
986 if (ch == '\n')
987 ch_state = LF_SEEN;
988 else
989 {
990 message_size++;
991 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
992 cutthrough_data_put_nl();
993 if (ch == '\r') continue; /* don't write CR */
994 ch_state = MID_LINE;
995 }
996 break;
997 }
998
999 /* Add the character to the spool file, unless skipping */
1000
1001 message_size++;
1002 linelength++;
1003 if (fout)
1004 {
1005 if (fputc(ch, fout) == EOF) return END_WERROR;
1006 if (message_size > thismessage_size_limit) return END_SIZE;
1007 }
1008 if(ch == '\n')
1009 cutthrough_data_put_nl();
1010 else
1011 {
1012 uschar c = ch;
1013 cutthrough_data_puts(&c, 1);
1014 }
1015 }
1016 /*NOTREACHED*/
1017 }
1018
1019 static int
1020 read_message_bdat_smtp_wire(FILE *fout)
1021 {
1022 int ch;
1023
1024 /* Remember that this message uses wireformat. */
1025
1026 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1027 fout ? "writing spoolfile in wire format" : "flushing input");
1028 spool_file_wireformat = TRUE;
1029
1030 for (;;)
1031 {
1032 if (chunking_data_left > 0)
1033 {
1034 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1035 uschar * buf = bdat_getbuf(&len);
1036
1037 if (!buf) return END_EOF;
1038 message_size += len;
1039 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1040 }
1041 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1042 {
1043 case EOF: return END_EOF;
1044 case EOD: return END_DOT;
1045 case ERR: return END_PROTOCOL;
1046
1047 default:
1048 message_size++;
1049 /*XXX not done:
1050 linelength
1051 max_received_linelength
1052 body_linecount
1053 body_zerocount
1054 */
1055 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1056 break;
1057 }
1058 if (message_size > thismessage_size_limit) return END_SIZE;
1059 }
1060 /*NOTREACHED*/
1061 }
1062
1063
1064
1065
1066 /*************************************************
1067 * Swallow SMTP message *
1068 *************************************************/
1069
1070 /* This function is called when there has been some kind of error while reading
1071 an SMTP message, and the remaining data may need to be swallowed. It is global
1072 because it is called from smtp_closedown() to shut down an incoming call
1073 tidily.
1074
1075 Argument: a FILE from which to read the message
1076 Returns: nothing
1077 */
1078
1079 void
1080 receive_swallow_smtp(void)
1081 {
1082 if (message_ended >= END_NOTENDED)
1083 message_ended = chunking_state <= CHUNKING_OFFERED
1084 ? read_message_data_smtp(NULL)
1085 : read_message_bdat_smtp_wire(NULL);
1086 }
1087
1088
1089
1090 /*************************************************
1091 * Handle lost SMTP connection *
1092 *************************************************/
1093
1094 /* This function logs connection loss incidents and generates an appropriate
1095 SMTP response.
1096
1097 Argument: additional data for the message
1098 Returns: the SMTP response
1099 */
1100
1101 static uschar *
1102 handle_lost_connection(uschar *s)
1103 {
1104 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1105 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1106 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1107 return US"421 Lost incoming connection";
1108 }
1109
1110
1111
1112
1113 /*************************************************
1114 * Handle a non-smtp reception error *
1115 *************************************************/
1116
1117 /* This function is called for various errors during the reception of non-SMTP
1118 messages. It either sends a message to the sender of the problem message, or it
1119 writes to the standard error stream.
1120
1121 Arguments:
1122 errcode code for moan_to_sender(), identifying the error
1123 text1 first message text, passed to moan_to_sender()
1124 text2 second message text, used only for stderrr
1125 error_rc code to pass to exim_exit if no problem
1126 f FILE containing body of message (may be stdin)
1127 hptr pointer to instore headers or NULL
1128
1129 Returns: calls exim_exit(), which does not return
1130 */
1131
1132 static void
1133 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1134 FILE *f, header_line *hptr)
1135 {
1136 if (error_handling == ERRORS_SENDER)
1137 {
1138 error_block eblock;
1139 eblock.next = NULL;
1140 eblock.text1 = text1;
1141 eblock.text2 = US"";
1142 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1143 error_rc = EXIT_FAILURE;
1144 }
1145 else
1146 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1147 (void)fclose(f);
1148 exim_exit(error_rc, US"");
1149 }
1150
1151
1152
1153 /*************************************************
1154 * Add header lines set up by ACL *
1155 *************************************************/
1156
1157 /* This function is called to add the header lines that were set up by
1158 statements in an ACL to the list of headers in memory. It is done in two stages
1159 like this, because when the ACL for RCPT is running, the other headers have not
1160 yet been received. This function is called twice; once just before running the
1161 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1162 are visible to the DATA ACL.
1163
1164 Originally these header lines were added at the end. Now there is support for
1165 three different places: top, bottom, and after the Received: header(s). There
1166 will always be at least one Received: header, even if it is marked deleted, and
1167 even if something else has been put in front of it.
1168
1169 Arguments:
1170 acl_name text to identify which ACL
1171
1172 Returns: nothing
1173 */
1174
1175 static void
1176 add_acl_headers(int where, uschar *acl_name)
1177 {
1178 header_line *h, *next;
1179 header_line *last_received = NULL;
1180
1181 switch(where)
1182 {
1183 case ACL_WHERE_DKIM:
1184 case ACL_WHERE_MIME:
1185 case ACL_WHERE_DATA:
1186 if ( cutthrough.fd >= 0 && cutthrough.delivery
1187 && (acl_removed_headers || acl_added_headers))
1188 {
1189 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1190 " will not take effect on cutthrough deliveries");
1191 return;
1192 }
1193 }
1194
1195 if (acl_removed_headers)
1196 {
1197 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1198
1199 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1200 {
1201 const uschar * list = acl_removed_headers;
1202 int sep = ':'; /* This is specified as a colon-separated list */
1203 uschar *s;
1204 uschar buffer[128];
1205
1206 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1207 if (header_testname(h, s, Ustrlen(s), FALSE))
1208 {
1209 h->type = htype_old;
1210 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1211 }
1212 }
1213 acl_removed_headers = NULL;
1214 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1215 }
1216
1217 if (!acl_added_headers) return;
1218 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1219
1220 for (h = acl_added_headers; h; h = next)
1221 {
1222 next = h->next;
1223
1224 switch(h->type)
1225 {
1226 case htype_add_top:
1227 h->next = header_list;
1228 header_list = h;
1229 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1230 break;
1231
1232 case htype_add_rec:
1233 if (!last_received)
1234 {
1235 last_received = header_list;
1236 while (!header_testname(last_received, US"Received", 8, FALSE))
1237 last_received = last_received->next;
1238 while (last_received->next &&
1239 header_testname(last_received->next, US"Received", 8, FALSE))
1240 last_received = last_received->next;
1241 }
1242 h->next = last_received->next;
1243 last_received->next = h;
1244 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1245 break;
1246
1247 case htype_add_rfc:
1248 /* add header before any header which is NOT Received: or Resent- */
1249 last_received = header_list;
1250 while ( last_received->next &&
1251 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1252 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1253 last_received = last_received->next;
1254 /* last_received now points to the last Received: or Resent-* header
1255 in an uninterrupted chain of those header types (seen from the beginning
1256 of all headers. Our current header must follow it. */
1257 h->next = last_received->next;
1258 last_received->next = h;
1259 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1260 break;
1261
1262 default:
1263 h->next = NULL;
1264 header_last->next = h;
1265 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1266 break;
1267 }
1268
1269 if (!h->next) header_last = h;
1270
1271 /* Check for one of the known header types (From:, To:, etc.) though in
1272 practice most added headers are going to be "other". Lower case
1273 identification letters are never stored with the header; they are used
1274 for existence tests when messages are received. So discard any lower case
1275 flag values. */
1276
1277 h->type = header_checkname(h, FALSE);
1278 if (h->type >= 'a') h->type = htype_other;
1279
1280 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1281 }
1282
1283 acl_added_headers = NULL;
1284 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1285 }
1286
1287
1288
1289 /*************************************************
1290 * Add host information for log line *
1291 *************************************************/
1292
1293 /* Called for acceptance and rejecting log lines. This adds information about
1294 the calling host to a string that is being built dynamically.
1295
1296 Arguments:
1297 s the dynamic string
1298
1299 Returns: the extended string
1300 */
1301
1302 static gstring *
1303 add_host_info_for_log(gstring * g)
1304 {
1305 if (sender_fullhost)
1306 {
1307 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1308 g = string_catn(g, US" DS", 3);
1309 g = string_append(g, 2, US" H=", sender_fullhost);
1310 if (LOGGING(incoming_interface) && interface_address != NULL)
1311 {
1312 g = string_cat(g,
1313 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1314 }
1315 }
1316 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1317 {
1318 g = string_catn(g, US" TFO", 4);
1319 tcp_in_fastopen_logged = TRUE;
1320 }
1321 if (sender_ident)
1322 g = string_append(g, 2, US" U=", sender_ident);
1323 if (received_protocol)
1324 g = string_append(g, 2, US" P=", received_protocol);
1325 return g;
1326 }
1327
1328
1329
1330 #ifdef WITH_CONTENT_SCAN
1331
1332 /*************************************************
1333 * Run the MIME ACL on a message *
1334 *************************************************/
1335
1336 /* This code is in a subroutine so that it can be used for both SMTP
1337 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1338
1339 Arguments:
1340 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1341 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1342 smtp_reply_ptr Where SMTP reply is being built
1343 blackholed_by_ptr Where "blackholed by" message is being built
1344
1345 Returns: TRUE to carry on; FALSE to abandon the message
1346 */
1347
1348 static BOOL
1349 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1350 uschar **blackholed_by_ptr)
1351 {
1352 FILE *mbox_file;
1353 uschar * rfc822_file_path = NULL;
1354 unsigned long mbox_size;
1355 header_line *my_headerlist;
1356 uschar *user_msg, *log_msg;
1357 int mime_part_count_buffer = -1;
1358 uschar * mbox_filename;
1359 int rc = OK;
1360
1361 /* check if it is a MIME message */
1362
1363 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1364 if ( my_headerlist->type != '*' /* skip deleted headers */
1365 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1366 )
1367 {
1368 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1369 goto DO_MIME_ACL;
1370 }
1371
1372 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1373 return TRUE;
1374
1375 DO_MIME_ACL:
1376
1377 /* make sure the eml mbox file is spooled up */
1378 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1379 { /* error while spooling */
1380 log_write(0, LOG_MAIN|LOG_PANIC,
1381 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1382 Uunlink(spool_name);
1383 unspool_mbox();
1384 #ifdef EXPERIMENTAL_DCC
1385 dcc_ok = 0;
1386 #endif
1387 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1388 message_id[0] = 0; /* Indicate no message accepted */
1389 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1390 return FALSE; /* Indicate skip to end of receive function */
1391 }
1392
1393 mime_is_rfc822 = 0;
1394
1395 MIME_ACL_CHECK:
1396 mime_part_count = -1;
1397 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1398 (void)fclose(mbox_file);
1399
1400 if (rfc822_file_path)
1401 {
1402 mime_part_count = mime_part_count_buffer;
1403
1404 if (unlink(CS rfc822_file_path) == -1)
1405 {
1406 log_write(0, LOG_PANIC,
1407 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1408 goto END_MIME_ACL;
1409 }
1410 rfc822_file_path = NULL;
1411 }
1412
1413 /* check if we must check any message/rfc822 attachments */
1414 if (rc == OK)
1415 {
1416 uschar * scandir = string_copyn(mbox_filename,
1417 Ustrrchr(mbox_filename, '/') - mbox_filename);
1418 struct dirent * entry;
1419 DIR * tempdir;
1420
1421 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1422 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1423 {
1424 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1425 DEBUG(D_receive)
1426 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1427 rfc822_file_path);
1428 break;
1429 }
1430 closedir(tempdir);
1431
1432 if (rfc822_file_path)
1433 {
1434 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1435 {
1436 /* set RFC822 expansion variable */
1437 mime_is_rfc822 = 1;
1438 mime_part_count_buffer = mime_part_count;
1439 goto MIME_ACL_CHECK;
1440 }
1441 log_write(0, LOG_PANIC,
1442 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1443 unlink(CS rfc822_file_path);
1444 }
1445 }
1446
1447 END_MIME_ACL:
1448 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1449 if (rc == DISCARD)
1450 {
1451 recipients_count = 0;
1452 *blackholed_by_ptr = US"MIME ACL";
1453 }
1454 else if (rc != OK)
1455 {
1456 Uunlink(spool_name);
1457 unspool_mbox();
1458 #ifdef EXPERIMENTAL_DCC
1459 dcc_ok = 0;
1460 #endif
1461 if (smtp_input)
1462 {
1463 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1464 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1465 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1466 }
1467 message_id[0] = 0; /* Indicate no message accepted */
1468 return FALSE; /* Cause skip to end of receive function */
1469 }
1470
1471 return TRUE;
1472 }
1473
1474 #endif /* WITH_CONTENT_SCAN */
1475
1476
1477
1478 void
1479 received_header_gen(void)
1480 {
1481 uschar *received;
1482 uschar *timestamp;
1483 header_line *received_header= header_list;
1484
1485 timestamp = expand_string(US"${tod_full}");
1486 if (recipients_count == 1) received_for = recipients_list[0].address;
1487 received = expand_string(received_header_text);
1488 received_for = NULL;
1489
1490 if (!received)
1491 {
1492 if(spool_name[0] != 0)
1493 Uunlink(spool_name); /* Lose the data file */
1494 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1495 "(received_header_text) failed: %s", string_printing(received_header_text),
1496 expand_string_message);
1497 }
1498
1499 /* The first element on the header chain is reserved for the Received header,
1500 so all we have to do is fill in the text pointer, and set the type. However, if
1501 the result of the expansion is an empty string, we leave the header marked as
1502 "old" so as to refrain from adding a Received header. */
1503
1504 if (received[0] == 0)
1505 {
1506 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1507 received_header->type = htype_old;
1508 }
1509 else
1510 {
1511 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1512 received_header->type = htype_received;
1513 }
1514
1515 received_header->slen = Ustrlen(received_header->text);
1516
1517 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1518 received_header->type, received_header->text);
1519 }
1520
1521
1522
1523 /*************************************************
1524 * Receive message *
1525 *************************************************/
1526
1527 /* Receive a message on the given input, and put it into a pair of spool files.
1528 Either a non-null list of recipients, or the extract flag will be true, or
1529 both. The flag sender_local is true for locally generated messages. The flag
1530 submission_mode is true if an ACL has obeyed "control = submission". The flag
1531 suppress_local_fixups is true if an ACL has obeyed "control =
1532 suppress_local_fixups" or -G was passed on the command-line.
1533 The flag smtp_input is true if the message is to be
1534 handled using SMTP conventions about termination and lines starting with dots.
1535 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1536
1537 If a message was successfully read, message_id[0] will be non-zero.
1538
1539 The general actions of this function are:
1540
1541 . Read the headers of the message (if any) into a chain of store
1542 blocks.
1543
1544 . If there is a "sender:" header and the message is locally originated,
1545 throw it away, unless the caller is trusted, or unless
1546 active_local_sender_retain is set - which can only happen if
1547 active_local_from_check is false.
1548
1549 . If recipients are to be extracted from the message, build the
1550 recipients list from the headers, removing any that were on the
1551 original recipients list (unless extract_addresses_remove_arguments is
1552 false), and at the same time, remove any bcc header that may be present.
1553
1554 . Get the spool file for the data, sort out its unique name, open
1555 and lock it (but don't give it the name yet).
1556
1557 . Generate a "Message-Id" header if the message doesn't have one, for
1558 locally-originated messages.
1559
1560 . Generate a "Received" header.
1561
1562 . Ensure the recipients list is fully qualified and rewritten if necessary.
1563
1564 . If there are any rewriting rules, apply them to the sender address
1565 and also to the headers.
1566
1567 . If there is no from: header, generate one, for locally-generated messages
1568 and messages in "submission mode" only.
1569
1570 . If the sender is local, check that from: is correct, and if not, generate
1571 a Sender: header, unless message comes from a trusted caller, or this
1572 feature is disabled by active_local_from_check being false.
1573
1574 . If there is no "date" header, generate one, for locally-originated
1575 or submission mode messages only.
1576
1577 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1578 dot_ends mode, to the data file. Leave it open, to hold the lock.
1579
1580 . Write the envelope and the headers to a new file.
1581
1582 . Set the name for the header file; close it.
1583
1584 . Set the name for the data file; close it.
1585
1586 Because this function can potentially be called many times in a single
1587 SMTP connection, all store should be got by store_get(), so that it will be
1588 automatically retrieved after the message is accepted.
1589
1590 FUDGE: It seems that sites on the net send out messages with just LF
1591 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1592 we make the CRs optional in all cases.
1593
1594 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1595 new regime is now in place in which bare CRs in header lines are turned into LF
1596 followed by a space, so as not to terminate the header line.
1597
1598 February 2004: A bare LF in a header line in a message whose first line was
1599 terminated by CRLF is treated in the same way as a bare CR.
1600
1601 Arguments:
1602 extract_recip TRUE if recipients are to be extracted from the message's
1603 headers
1604
1605 Returns: TRUE there are more messages to be read (SMTP input)
1606 FALSE there are no more messages to be read (non-SMTP input
1607 or SMTP connection collapsed, or other failure)
1608
1609 When reading a message for filter testing, the returned value indicates
1610 whether the headers (which is all that is read) were terminated by '.' or
1611 not. */
1612
1613 BOOL
1614 receive_msg(BOOL extract_recip)
1615 {
1616 int i;
1617 int rc = FAIL;
1618 int msg_size = 0;
1619 int process_info_len = Ustrlen(process_info);
1620 int error_rc = error_handling == ERRORS_SENDER
1621 ? errors_sender_rc : EXIT_FAILURE;
1622 int header_size = 256;
1623 int start, end, domain;
1624 int id_resolution;
1625 int had_zero = 0;
1626 int prevlines_length = 0;
1627
1628 register int ptr = 0;
1629
1630 BOOL contains_resent_headers = FALSE;
1631 BOOL extracted_ignored = FALSE;
1632 BOOL first_line_ended_crlf = TRUE_UNSET;
1633 BOOL smtp_yield = TRUE;
1634 BOOL yield = FALSE;
1635
1636 BOOL resents_exist = FALSE;
1637 uschar *resent_prefix = US"";
1638 uschar *blackholed_by = NULL;
1639 uschar *blackhole_log_msg = US"";
1640 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1641
1642 flock_t lock_data;
1643 error_block *bad_addresses = NULL;
1644
1645 uschar *frozen_by = NULL;
1646 uschar *queued_by = NULL;
1647
1648 uschar *errmsg;
1649 gstring * g;
1650 struct stat statbuf;
1651
1652 /* Final message to give to SMTP caller, and messages from ACLs */
1653
1654 uschar *smtp_reply = NULL;
1655 uschar *user_msg, *log_msg;
1656
1657 /* Working header pointers */
1658
1659 header_line *h, *next;
1660
1661 /* Flags for noting the existence of certain headers (only one left) */
1662
1663 BOOL date_header_exists = FALSE;
1664
1665 /* Pointers to receive the addresses of headers whose contents we need. */
1666
1667 header_line *from_header = NULL;
1668 header_line *subject_header = NULL;
1669 header_line *msgid_header = NULL;
1670 header_line *received_header;
1671
1672 #ifdef EXPERIMENTAL_DMARC
1673 int dmarc_up = 0;
1674 #endif /* EXPERIMENTAL_DMARC */
1675
1676 /* Variables for use when building the Received: header. */
1677
1678 uschar *timestamp;
1679 int tslen;
1680
1681 /* Release any open files that might have been cached while preparing to
1682 accept the message - e.g. by verifying addresses - because reading a message
1683 might take a fair bit of real time. */
1684
1685 search_tidyup();
1686
1687 /* Extracting the recipient list from an input file is incompatible with
1688 cutthrough delivery with the no-spool option. It shouldn't be possible
1689 to set up the combination, but just in case kill any ongoing connection. */
1690 if (extract_recip || !smtp_input)
1691 cancel_cutthrough_connection(TRUE, US"not smtp input");
1692
1693 /* Initialize the chain of headers by setting up a place-holder for Received:
1694 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1695 pointing to the end of the chain to make adding headers simple. */
1696
1697 received_header = header_list = header_last = store_get(sizeof(header_line));
1698 header_list->next = NULL;
1699 header_list->type = htype_old;
1700 header_list->text = NULL;
1701 header_list->slen = 0;
1702
1703 /* Control block for the next header to be read. */
1704
1705 next = store_get(sizeof(header_line));
1706 next->text = store_get(header_size);
1707
1708 /* Initialize message id to be null (indicating no message read), and the
1709 header names list to be the normal list. Indicate there is no data file open
1710 yet, initialize the size and warning count, and deal with no size limit. */
1711
1712 message_id[0] = 0;
1713 data_file = NULL;
1714 data_fd = -1;
1715 spool_name = US"";
1716 message_size = 0;
1717 warning_count = 0;
1718 received_count = 1; /* For the one we will add */
1719
1720 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1721
1722 /* While reading the message, the following counts are computed. */
1723
1724 message_linecount = body_linecount = body_zerocount =
1725 max_received_linelength = 0;
1726
1727 #ifndef DISABLE_DKIM
1728 /* Call into DKIM to set up the context. In CHUNKING mode
1729 we clear the dot-stuffing flag */
1730 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1731 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1732 #endif
1733
1734 #ifdef EXPERIMENTAL_DMARC
1735 /* initialize libopendmarc */
1736 dmarc_up = dmarc_init();
1737 #endif
1738
1739 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1740 ids, and fractions of a second are required. See the comments that precede the
1741 message id creation below. */
1742
1743 (void)gettimeofday(&message_id_tv, NULL);
1744
1745 /* For other uses of the received time we can operate with granularity of one
1746 second, and for that we use the global variable received_time. This is for
1747 things like ultimate message timeouts. */
1748
1749 received_time = message_id_tv;
1750
1751 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1752 happen in the smtp_getc() function when it refills its buffer. */
1753
1754 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1755
1756 /* If not SMTP input, timeout happens only if configured, and we just set a
1757 single timeout for the whole message. */
1758
1759 else if (receive_timeout > 0)
1760 {
1761 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1762 alarm(receive_timeout);
1763 }
1764
1765 /* SIGTERM and SIGINT are caught always. */
1766
1767 signal(SIGTERM, data_sigterm_sigint_handler);
1768 signal(SIGINT, data_sigterm_sigint_handler);
1769
1770 /* Header lines in messages are not supposed to be very long, though when
1771 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1772 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1773 storing the header, and extend this as necessary using string_cat().
1774
1775 To cope with total lunacies, impose an upper limit on the length of the header
1776 section of the message, as otherwise the store will fill up. We must also cope
1777 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1778 Folded header lines are joined into one string, leaving the '\n' characters
1779 inside them, so that writing them out reproduces the input.
1780
1781 Loop for each character of each header; the next structure for chaining the
1782 header is set up already, with ptr the offset of the next character in
1783 next->text. */
1784
1785 for (;;)
1786 {
1787 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1788
1789 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1790 SMTP must have a correct "." terminator. */
1791
1792 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1793 {
1794 smtp_reply = handle_lost_connection(US" (header)");
1795 smtp_yield = FALSE;
1796 goto TIDYUP; /* Skip to end of function */
1797 }
1798
1799 /* See if we are at the current header's size limit - there must be at least
1800 four bytes left. This allows for the new character plus a zero, plus two for
1801 extra insertions when we are playing games with dots and carriage returns. If
1802 we are at the limit, extend the text buffer. This could have been done
1803 automatically using string_cat() but because this is a tightish loop storing
1804 only one character at a time, we choose to do it inline. Normally
1805 store_extend() will be able to extend the block; only at the end of a big
1806 store block will a copy be needed. To handle the case of very long headers
1807 (and sometimes lunatic messages can have ones that are 100s of K long) we
1808 call store_release() for strings that have been copied - if the string is at
1809 the start of a block (and therefore the only thing in it, because we aren't
1810 doing any other gets), the block gets freed. We can only do this release if
1811 there were no allocations since the once that we want to free. */
1812
1813 if (ptr >= header_size - 4)
1814 {
1815 int oldsize = header_size;
1816 /* header_size += 256; */
1817 header_size *= 2;
1818 if (!store_extend(next->text, oldsize, header_size))
1819 next->text = store_newblock(next->text, header_size, ptr);
1820 }
1821
1822 /* Cope with receiving a binary zero. There is dispute about whether
1823 these should be allowed in RFC 822 messages. The middle view is that they
1824 should not be allowed in headers, at least. Exim takes this attitude at
1825 the moment. We can't just stomp on them here, because we don't know that
1826 this line is a header yet. Set a flag to cause scanning later. */
1827
1828 if (ch == 0) had_zero++;
1829
1830 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1831 those from data files use just LF. Treat LF in local SMTP input as a
1832 terminator too. Treat EOF as a line terminator always. */
1833
1834 if (ch == EOF) goto EOL;
1835
1836 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1837 other MTAs accept this. We are therefore forced into this "liberalisation"
1838 too, so we accept LF as a line terminator whatever the source of the message.
1839 However, if the first line of the message ended with a CRLF, we treat a bare
1840 LF specially by inserting a white space after it to ensure that the header
1841 line is not terminated. */
1842
1843 if (ch == '\n')
1844 {
1845 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1846 else if (first_line_ended_crlf) receive_ungetc(' ');
1847 goto EOL;
1848 }
1849
1850 /* This is not the end of the line. If this is SMTP input and this is
1851 the first character in the line and it is a "." character, ignore it.
1852 This implements the dot-doubling rule, though header lines starting with
1853 dots aren't exactly common. They are legal in RFC 822, though. If the
1854 following is CRLF or LF, this is the line that that terminates the
1855 entire message. We set message_ended to indicate this has happened (to
1856 prevent further reading), and break out of the loop, having freed the
1857 empty header, and set next = NULL to indicate no data line. */
1858
1859 if (ptr == 0 && ch == '.' && dot_ends)
1860 {
1861 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1862 if (ch == '\r')
1863 {
1864 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1865 if (ch != '\n')
1866 {
1867 receive_ungetc(ch);
1868 ch = '\r'; /* Revert to CR */
1869 }
1870 }
1871 if (ch == '\n')
1872 {
1873 message_ended = END_DOT;
1874 store_reset(next);
1875 next = NULL;
1876 break; /* End character-reading loop */
1877 }
1878
1879 /* For non-SMTP input, the dot at the start of the line was really a data
1880 character. What is now in ch is the following character. We guaranteed
1881 enough space for this above. */
1882
1883 if (!smtp_input)
1884 {
1885 next->text[ptr++] = '.';
1886 message_size++;
1887 }
1888 }
1889
1890 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1891 remember this case if this is the first line ending. */
1892
1893 if (ch == '\r')
1894 {
1895 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1896 if (ch == '\n')
1897 {
1898 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1899 goto EOL;
1900 }
1901
1902 /* Otherwise, put back the character after CR, and turn the bare CR
1903 into LF SP. */
1904
1905 ch = (receive_ungetc)(ch);
1906 next->text[ptr++] = '\n';
1907 message_size++;
1908 ch = ' ';
1909 }
1910
1911 /* We have a data character for the header line. */
1912
1913 next->text[ptr++] = ch; /* Add to buffer */
1914 message_size++; /* Total message size so far */
1915
1916 /* Handle failure due to a humungously long header section. The >= allows
1917 for the terminating \n. Add what we have so far onto the headers list so
1918 that it gets reflected in any error message, and back up the just-read
1919 character. */
1920
1921 if (message_size >= header_maxsize)
1922 {
1923 next->text[ptr] = 0;
1924 next->slen = ptr;
1925 next->type = htype_other;
1926 next->next = NULL;
1927 header_last->next = next;
1928 header_last = next;
1929
1930 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1931 "%s (more than %d characters): message abandoned",
1932 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1933
1934 if (smtp_input)
1935 {
1936 smtp_reply = US"552 Message header is ridiculously long";
1937 receive_swallow_smtp();
1938 goto TIDYUP; /* Skip to end of function */
1939 }
1940
1941 else
1942 {
1943 give_local_error(ERRMESS_VLONGHEADER,
1944 string_sprintf("message header longer than %d characters received: "
1945 "message not accepted", header_maxsize), US"", error_rc, stdin,
1946 header_list->next);
1947 /* Does not return */
1948 }
1949 }
1950
1951 continue; /* With next input character */
1952
1953 /* End of header line reached */
1954
1955 EOL:
1956
1957 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1958
1959 receive_linecount++;
1960 message_linecount++;
1961
1962 /* Keep track of maximum line length */
1963
1964 if (ptr - prevlines_length > max_received_linelength)
1965 max_received_linelength = ptr - prevlines_length;
1966 prevlines_length = ptr + 1;
1967
1968 /* Now put in the terminating newline. There is always space for
1969 at least two more characters. */
1970
1971 next->text[ptr++] = '\n';
1972 message_size++;
1973
1974 /* A blank line signals the end of the headers; release the unwanted
1975 space and set next to NULL to indicate this. */
1976
1977 if (ptr == 1)
1978 {
1979 store_reset(next);
1980 next = NULL;
1981 break;
1982 }
1983
1984 /* There is data in the line; see if the next input character is a
1985 whitespace character. If it is, we have a continuation of this header line.
1986 There is always space for at least one character at this point. */
1987
1988 if (ch != EOF)
1989 {
1990 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1991 if (nextch == ' ' || nextch == '\t')
1992 {
1993 next->text[ptr++] = nextch;
1994 message_size++;
1995 continue; /* Iterate the loop */
1996 }
1997 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1998 else ch = EOF; /* Cause main loop to exit at end */
1999 }
2000
2001 /* We have got to the real line end. Terminate the string and release store
2002 beyond it. If it turns out to be a real header, internal binary zeros will
2003 be squashed later. */
2004
2005 next->text[ptr] = 0;
2006 next->slen = ptr;
2007 store_reset(next->text + ptr + 1);
2008
2009 /* Check the running total size against the overall message size limit. We
2010 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2011 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2012 headers - the code to read the body will then also hit the buffer. */
2013
2014 if (message_size > thismessage_size_limit) break;
2015
2016 /* A line that is not syntactically correct for a header also marks
2017 the end of the headers. In this case, we leave next containing the
2018 first data line. This might actually be several lines because of the
2019 continuation logic applied above, but that doesn't matter.
2020
2021 It turns out that smail, and presumably sendmail, accept leading lines
2022 of the form
2023
2024 From ph10 Fri Jan 5 12:35 GMT 1996
2025
2026 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2027 find any documentation of this, but for compatibility it had better be
2028 accepted. Exim restricts it to the case of non-smtp messages, and
2029 treats it as an alternative to the -f command line option. Thus it is
2030 ignored except for trusted users or filter testing. Otherwise it is taken
2031 as the sender address, unless -f was used (sendmail compatibility).
2032
2033 It further turns out that some UUCPs generate the From_line in a different
2034 format, e.g.
2035
2036 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2037
2038 The regex for matching these things is now capable of recognizing both
2039 formats (including 2- and 4-digit years in the latter). In fact, the regex
2040 is now configurable, as is the expansion string to fish out the sender.
2041
2042 Even further on it has been discovered that some broken clients send
2043 these lines in SMTP messages. There is now an option to ignore them from
2044 specified hosts or networks. Sigh. */
2045
2046 if ( header_last == header_list
2047 && ( !smtp_input
2048 || ( sender_host_address
2049 && verify_check_host(&ignore_fromline_hosts) == OK
2050 )
2051 || (!sender_host_address && ignore_fromline_local)
2052 )
2053 && regex_match_and_setup(regex_From, next->text, 0, -1)
2054 )
2055 {
2056 if (!sender_address_forced)
2057 {
2058 uschar *uucp_sender = expand_string(uucp_from_sender);
2059 if (!uucp_sender)
2060 log_write(0, LOG_MAIN|LOG_PANIC,
2061 "expansion of \"%s\" failed after matching "
2062 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2063 else
2064 {
2065 int start, end, domain;
2066 uschar *errmess;
2067 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2068 &start, &end, &domain, TRUE);
2069 if (newsender)
2070 {
2071 if (domain == 0 && newsender[0] != 0)
2072 newsender = rewrite_address_qualify(newsender, FALSE);
2073
2074 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2075 {
2076 sender_address = newsender;
2077
2078 if (trusted_caller || filter_test != FTEST_NONE)
2079 {
2080 authenticated_sender = NULL;
2081 originator_name = US"";
2082 sender_local = FALSE;
2083 }
2084
2085 if (filter_test != FTEST_NONE)
2086 printf("Sender taken from \"From \" line\n");
2087 }
2088 }
2089 }
2090 }
2091 }
2092
2093 /* Not a leading "From " line. Check to see if it is a valid header line.
2094 Header names may contain any non-control characters except space and colon,
2095 amazingly. */
2096
2097 else
2098 {
2099 uschar *p = next->text;
2100
2101 /* If not a valid header line, break from the header reading loop, leaving
2102 next != NULL, indicating that it holds the first line of the body. */
2103
2104 if (isspace(*p)) break;
2105 while (mac_isgraph(*p) && *p != ':') p++;
2106 while (isspace(*p)) p++;
2107 if (*p != ':')
2108 {
2109 body_zerocount = had_zero;
2110 break;
2111 }
2112
2113 /* We have a valid header line. If there were any binary zeroes in
2114 the line, stomp on them here. */
2115
2116 if (had_zero > 0)
2117 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2118
2119 /* It is perfectly legal to have an empty continuation line
2120 at the end of a header, but it is confusing to humans
2121 looking at such messages, since it looks like a blank line.
2122 Reduce confusion by removing redundant white space at the
2123 end. We know that there is at least one printing character
2124 (the ':' tested for above) so there is no danger of running
2125 off the end. */
2126
2127 p = next->text + ptr - 2;
2128 for (;;)
2129 {
2130 while (*p == ' ' || *p == '\t') p--;
2131 if (*p != '\n') break;
2132 ptr = (p--) - next->text + 1;
2133 message_size -= next->slen - ptr;
2134 next->text[ptr] = 0;
2135 next->slen = ptr;
2136 }
2137
2138 /* Add the header to the chain */
2139
2140 next->type = htype_other;
2141 next->next = NULL;
2142 header_last->next = next;
2143 header_last = next;
2144
2145 /* Check the limit for individual line lengths. This comes after adding to
2146 the chain so that the failing line is reflected if a bounce is generated
2147 (for a local message). */
2148
2149 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2150 {
2151 log_write(0, LOG_MAIN, "overlong message header line received from "
2152 "%s (more than %d characters): message abandoned",
2153 sender_host_unknown? sender_ident : sender_fullhost,
2154 header_line_maxsize);
2155
2156 if (smtp_input)
2157 {
2158 smtp_reply = US"552 A message header line is too long";
2159 receive_swallow_smtp();
2160 goto TIDYUP; /* Skip to end of function */
2161 }
2162
2163 else
2164 give_local_error(ERRMESS_VLONGHDRLINE,
2165 string_sprintf("message header line longer than %d characters "
2166 "received: message not accepted", header_line_maxsize), US"",
2167 error_rc, stdin, header_list->next);
2168 /* Does not return */
2169 }
2170
2171 /* Note if any resent- fields exist. */
2172
2173 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2174 {
2175 resents_exist = TRUE;
2176 resent_prefix = US"Resent-";
2177 }
2178 }
2179
2180 /* Reject CHUNKING messages that do not CRLF their first header line */
2181
2182 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2183 {
2184 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2185 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2186 sender_address,
2187 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2188 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2189 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2190 bdat_flush_data();
2191 smtp_reply = US"";
2192 goto TIDYUP; /* Skip to end of function */
2193 }
2194
2195 /* The line has been handled. If we have hit EOF, break out of the loop,
2196 indicating no pending data line. */
2197
2198 if (ch == EOF) { next = NULL; break; }
2199
2200 /* Set up for the next header */
2201
2202 header_size = 256;
2203 next = store_get(sizeof(header_line));
2204 next->text = store_get(header_size);
2205 ptr = 0;
2206 had_zero = 0;
2207 prevlines_length = 0;
2208 } /* Continue, starting to read the next header */
2209
2210 /* At this point, we have read all the headers into a data structure in main
2211 store. The first header is still the dummy placeholder for the Received: header
2212 we are going to generate a bit later on. If next != NULL, it contains the first
2213 data line - which terminated the headers before reaching a blank line (not the
2214 normal case). */
2215
2216 DEBUG(D_receive)
2217 {
2218 debug_printf(">>Headers received:\n");
2219 for (h = header_list->next; h; h = h->next)
2220 debug_printf("%s", h->text);
2221 debug_printf("\n");
2222 }
2223
2224 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2225 is dropped immediately after valid headers, the next thing we will see is EOF.
2226 We must test for this specially, as further down the reading of the data is
2227 skipped if already at EOF. */
2228
2229 if (smtp_input && (receive_feof)())
2230 {
2231 smtp_reply = handle_lost_connection(US" (after header)");
2232 smtp_yield = FALSE;
2233 goto TIDYUP; /* Skip to end of function */
2234 }
2235
2236 /* If this is a filter test run and no headers were read, output a warning
2237 in case there is a mistake in the test message. */
2238
2239 if (filter_test != FTEST_NONE && header_list->next == NULL)
2240 printf("Warning: no message headers read\n");
2241
2242
2243 /* Scan the headers to identify them. Some are merely marked for later
2244 processing; some are dealt with here. */
2245
2246 for (h = header_list->next; h; h = h->next)
2247 {
2248 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2249 if (is_resent) contains_resent_headers = TRUE;
2250
2251 switch (header_checkname(h, is_resent))
2252 {
2253 case htype_bcc:
2254 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2255 break;
2256
2257 case htype_cc:
2258 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2259 break;
2260
2261 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2262
2263 case htype_date:
2264 if (!resents_exist || is_resent) date_header_exists = TRUE;
2265 break;
2266
2267 /* Same comments as about Return-Path: below. */
2268
2269 case htype_delivery_date:
2270 if (delivery_date_remove) h->type = htype_old;
2271 break;
2272
2273 /* Same comments as about Return-Path: below. */
2274
2275 case htype_envelope_to:
2276 if (envelope_to_remove) h->type = htype_old;
2277 break;
2278
2279 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2280 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2281 header consists of just the login id of the user who called Exim, rewrite
2282 it with the gecos field first. Apply this rule to Resent-From: if there
2283 are resent- fields. */
2284
2285 case htype_from:
2286 h->type = htype_from;
2287 if (!resents_exist || is_resent)
2288 {
2289 from_header = h;
2290 if (!smtp_input)
2291 {
2292 int len;
2293 uschar *s = Ustrchr(h->text, ':') + 1;
2294 while (isspace(*s)) s++;
2295 len = h->slen - (s - h->text) - 1;
2296 if (Ustrlen(originator_login) == len &&
2297 strncmpic(s, originator_login, len) == 0)
2298 {
2299 uschar *name = is_resent? US"Resent-From" : US"From";
2300 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2301 originator_login, qualify_domain_sender);
2302 from_header = header_last;
2303 h->type = htype_old;
2304 DEBUG(D_receive|D_rewrite)
2305 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2306 }
2307 }
2308 }
2309 break;
2310
2311 /* Identify the Message-id: header for generating "in-reply-to" in the
2312 autoreply transport. For incoming logging, save any resent- value. In both
2313 cases, take just the first of any multiples. */
2314
2315 case htype_id:
2316 if (!msgid_header && (!resents_exist || is_resent))
2317 {
2318 msgid_header = h;
2319 h->type = htype_id;
2320 }
2321 break;
2322
2323 /* Flag all Received: headers */
2324
2325 case htype_received:
2326 h->type = htype_received;
2327 received_count++;
2328 break;
2329
2330 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2331
2332 case htype_reply_to:
2333 h->type = htype_reply_to;
2334 break;
2335
2336 /* The Return-path: header is supposed to be added to messages when
2337 they leave the SMTP system. We shouldn't receive messages that already
2338 contain Return-path. However, since Exim generates Return-path: on
2339 local delivery, resent messages may well contain it. We therefore
2340 provide an option (which defaults on) to remove any Return-path: headers
2341 on input. Removal actually means flagging as "old", which prevents the
2342 header being transmitted with the message. */
2343
2344 case htype_return_path:
2345 if (return_path_remove) h->type = htype_old;
2346
2347 /* If we are testing a mail filter file, use the value of the
2348 Return-Path: header to set up the return_path variable, which is not
2349 otherwise set. However, remove any <> that surround the address
2350 because the variable doesn't have these. */
2351
2352 if (filter_test != FTEST_NONE)
2353 {
2354 uschar *start = h->text + 12;
2355 uschar *end = start + Ustrlen(start);
2356 while (isspace(*start)) start++;
2357 while (end > start && isspace(end[-1])) end--;
2358 if (*start == '<' && end[-1] == '>')
2359 {
2360 start++;
2361 end--;
2362 }
2363 return_path = string_copyn(start, end - start);
2364 printf("Return-path taken from \"Return-path:\" header line\n");
2365 }
2366 break;
2367
2368 /* If there is a "Sender:" header and the message is locally originated,
2369 and from an untrusted caller and suppress_local_fixups is not set, or if we
2370 are in submission mode for a remote message, mark it "old" so that it will
2371 not be transmitted with the message, unless active_local_sender_retain is
2372 set. (This can only be true if active_local_from_check is false.) If there
2373 are any resent- headers in the message, apply this rule to Resent-Sender:
2374 instead of Sender:. Messages with multiple resent- header sets cannot be
2375 tidily handled. (For this reason, at least one MUA - Pine - turns old
2376 resent- headers into X-resent- headers when resending, leaving just one
2377 set.) */
2378
2379 case htype_sender:
2380 h->type = !active_local_sender_retain
2381 && ( sender_local && !trusted_caller && !suppress_local_fixups
2382 || submission_mode
2383 )
2384 && (!resents_exist || is_resent)
2385 ? htype_old : htype_sender;
2386 break;
2387
2388 /* Remember the Subject: header for logging. There is no Resent-Subject */
2389
2390 case htype_subject:
2391 subject_header = h;
2392 break;
2393
2394 /* "To:" gets flagged, and the existence of a recipient header is noted,
2395 whether it's resent- or not. */
2396
2397 case htype_to:
2398 h->type = htype_to;
2399 /****
2400 to_or_cc_header_exists = TRUE;
2401 ****/
2402 break;
2403 }
2404 }
2405
2406 /* Extract recipients from the headers if that is required (the -t option).
2407 Note that this is documented as being done *before* any address rewriting takes
2408 place. There are two possibilities:
2409
2410 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2411 recipients already listed are to be REMOVED from the message. Smail 3 works
2412 like this. We need to build a non-recipients tree for that list, because in
2413 subsequent processing this data is held in a tree and that's what the
2414 spool_write_header() function expects. Make sure that non-recipient addresses
2415 are fully qualified and rewritten if necessary.
2416
2417 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2418 those in the command line arguments (and it is rumoured some other MTAs do
2419 this). Therefore, there is an option to make Exim behave this way.
2420
2421 *** Notes on "Resent-" header lines ***
2422
2423 The presence of resent-headers in the message makes -t horribly ambiguous.
2424 Experiments with sendmail showed that it uses recipients for all resent-
2425 headers, totally ignoring the concept of "sets of resent- headers" as described
2426 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2427 with all the addresses in one instance of each header.
2428
2429 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2430 error for -t if there were resent- headers in the message. However, after a
2431 discussion on the mailing list, I've learned that there are MUAs that use
2432 resent- headers with -t, and also that the stuff about sets of resent- headers
2433 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2434 message with -t and resent- header lines makes sure that only *its* resent-
2435 headers are present; previous ones are often renamed as X-resent- for example.
2436
2437 Consequently, Exim has been changed so that, if any resent- header lines are
2438 present, the recipients are taken from all of the appropriate resent- lines,
2439 and not from the ordinary To:, Cc:, etc. */
2440
2441 if (extract_recip)
2442 {
2443 int rcount = 0;
2444 error_block **bnext = &bad_addresses;
2445
2446 if (extract_addresses_remove_arguments)
2447 {
2448 while (recipients_count-- > 0)
2449 {
2450 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2451 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2452 tree_add_nonrecipient(s);
2453 }
2454 recipients_list = NULL;
2455 recipients_count = recipients_list_max = 0;
2456 }
2457
2458 /* Now scan the headers */
2459
2460 for (h = header_list->next; h; h = h->next)
2461 {
2462 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2463 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2464 {
2465 uschar *s = Ustrchr(h->text, ':') + 1;
2466 while (isspace(*s)) s++;
2467
2468 parse_allow_group = TRUE; /* Allow address group syntax */
2469
2470 while (*s != 0)
2471 {
2472 uschar *ss = parse_find_address_end(s, FALSE);
2473 uschar *recipient, *errmess, *p, *pp;
2474 int start, end, domain;
2475
2476 /* Check on maximum */
2477
2478 if (recipients_max > 0 && ++rcount > recipients_max)
2479 {
2480 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2481 US"message rejected: ", error_rc, stdin, NULL);
2482 /* Does not return */
2483 }
2484
2485 /* Make a copy of the address, and remove any internal newlines. These
2486 may be present as a result of continuations of the header line. The
2487 white space that follows the newline must not be removed - it is part
2488 of the header. */
2489
2490 pp = recipient = store_get(ss - s + 1);
2491 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2492 *pp = 0;
2493
2494 #ifdef SUPPORT_I18N
2495 {
2496 BOOL b = allow_utf8_domains;
2497 allow_utf8_domains = TRUE;
2498 #endif
2499 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2500 &domain, FALSE);
2501
2502 #ifdef SUPPORT_I18N
2503 if (string_is_utf8(recipient))
2504 message_smtputf8 = TRUE;
2505 else
2506 allow_utf8_domains = b;
2507 }
2508 #endif
2509
2510 /* Keep a list of all the bad addresses so we can send a single
2511 error message at the end. However, an empty address is not an error;
2512 just ignore it. This can come from an empty group list like
2513
2514 To: Recipients of list:;
2515
2516 If there are no recipients at all, an error will occur later. */
2517
2518 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2519 {
2520 int len = Ustrlen(s);
2521 error_block *b = store_get(sizeof(error_block));
2522 while (len > 0 && isspace(s[len-1])) len--;
2523 b->next = NULL;
2524 b->text1 = string_printing(string_copyn(s, len));
2525 b->text2 = errmess;
2526 *bnext = b;
2527 bnext = &(b->next);
2528 }
2529
2530 /* If the recipient is already in the nonrecipients tree, it must
2531 have appeared on the command line with the option extract_addresses_
2532 remove_arguments set. Do not add it to the recipients, and keep a note
2533 that this has happened, in order to give a better error if there are
2534 no recipients left. */
2535
2536 else if (recipient != NULL)
2537 {
2538 if (tree_search(tree_nonrecipients, recipient) == NULL)
2539 receive_add_recipient(recipient, -1);
2540 else
2541 extracted_ignored = TRUE;
2542 }
2543
2544 /* Move on past this address */
2545
2546 s = ss + (*ss? 1:0);
2547 while (isspace(*s)) s++;
2548 } /* Next address */
2549
2550 parse_allow_group = FALSE; /* Reset group syntax flags */
2551 parse_found_group = FALSE;
2552
2553 /* If this was the bcc: header, mark it "old", which means it
2554 will be kept on the spool, but not transmitted as part of the
2555 message. */
2556
2557 if (h->type == htype_bcc) h->type = htype_old;
2558 } /* For appropriate header line */
2559 } /* For each header line */
2560
2561 }
2562
2563 /* Now build the unique message id. This has changed several times over the
2564 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2565 Retaining all the history in the comment has become too unwieldy - read
2566 previous release sources if you want it.
2567
2568 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2569 The first part is the current time, in seconds. The second part is the current
2570 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2571 can hold a number in the range 0-3843. It used to be a computed sequence
2572 number, but is now the fractional component of the current time in units of
2573 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2574 received, Exim ensures that the timer has ticked at the appropriate level
2575 before proceeding, to avoid duplication if the pid happened to be re-used
2576 within the same time period. It seems likely that most messages will take at
2577 least half a millisecond to be received, so no delay will normally be
2578 necessary. At least for some time...
2579
2580 There is a modification when localhost_number is set. Formerly this was allowed
2581 to be as large as 255. Now it is restricted to the range 0-16, and the final
2582 component of the message id becomes (localhost_number * 200) + fractional time
2583 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2584
2585 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2586 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2587 still allows the tttttt field to hold a large enough number to last for some
2588 more decades, and the final two-digit field can hold numbers up to 1295, which
2589 is enough for milliseconds (instead of 1/2000 of a second).
2590
2591 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2592 pid, so it is probably safe because pids have to be positive. The
2593 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2594 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2595
2596 Note that string_base62() returns its data in a static storage block, so it
2597 must be copied before calling string_base62() again. It always returns exactly
2598 6 characters.
2599
2600 There doesn't seem to be anything in the RFC which requires a message id to
2601 start with a letter, but Smail was changed to ensure this. The external form of
2602 the message id (as supplied by string expansion) therefore starts with an
2603 additional leading 'E'. The spool file names do not include this leading
2604 letter and it is not used internally.
2605
2606 NOTE: If ever the format of message ids is changed, the regular expression for
2607 checking that a string is in this format must be updated in a corresponding
2608 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2609 must also be changed to reflect the correct string length. The queue-sort code
2610 needs to know the layout. Then, of course, other programs that rely on the
2611 message id format will need updating too. */
2612
2613 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2614 message_id[6] = '-';
2615 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2616
2617 /* Deal with the case where the host number is set. The value of the number was
2618 checked when it was read, to ensure it isn't too big. The timing granularity is
2619 left in id_resolution so that an appropriate wait can be done after receiving
2620 the message, if necessary (we hope it won't be). */
2621
2622 if (host_number_string)
2623 {
2624 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2625 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2626 string_base62((long int)(
2627 host_number * (1000000/id_resolution) +
2628 message_id_tv.tv_usec/id_resolution)) + 4);
2629 }
2630
2631 /* Host number not set: final field is just the fractional time at an
2632 appropriate resolution. */
2633
2634 else
2635 {
2636 id_resolution = (BASE_62 == 62)? 500 : 1000;
2637 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2638 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2639 }
2640
2641 /* Add the current message id onto the current process info string if
2642 it will fit. */
2643
2644 (void)string_format(process_info + process_info_len,
2645 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2646
2647 /* If we are using multiple input directories, set up the one for this message
2648 to be the least significant base-62 digit of the time of arrival. Otherwise
2649 ensure that it is an empty string. */
2650
2651 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2652
2653 /* Now that we have the message-id, if there is no message-id: header, generate
2654 one, but only for local (without suppress_local_fixups) or submission mode
2655 messages. This can be user-configured if required, but we had better flatten
2656 any illegal characters therein. */
2657
2658 if ( !msgid_header
2659 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2660 {
2661 uschar *p;
2662 uschar *id_text = US"";
2663 uschar *id_domain = primary_hostname;
2664
2665 /* Permit only letters, digits, dots, and hyphens in the domain */
2666
2667 if (message_id_domain)
2668 {
2669 uschar *new_id_domain = expand_string(message_id_domain);
2670 if (!new_id_domain)
2671 {
2672 if (!expand_string_forcedfail)
2673 log_write(0, LOG_MAIN|LOG_PANIC,
2674 "expansion of \"%s\" (message_id_header_domain) "
2675 "failed: %s", message_id_domain, expand_string_message);
2676 }
2677 else if (*new_id_domain)
2678 {
2679 id_domain = new_id_domain;
2680 for (p = id_domain; *p; p++)
2681 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2682 }
2683 }
2684
2685 /* Permit all characters except controls and RFC 2822 specials in the
2686 additional text part. */
2687
2688 if (message_id_text)
2689 {
2690 uschar *new_id_text = expand_string(message_id_text);
2691 if (!new_id_text)
2692 {
2693 if (!expand_string_forcedfail)
2694 log_write(0, LOG_MAIN|LOG_PANIC,
2695 "expansion of \"%s\" (message_id_header_text) "
2696 "failed: %s", message_id_text, expand_string_message);
2697 }
2698 else if (*new_id_text)
2699 {
2700 id_text = new_id_text;
2701 for (p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2702 }
2703 }
2704
2705 /* Add the header line
2706 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2707 * appended, to preserve classical expectations of header ordering. */
2708
2709 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2710 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2711 (*id_text == 0)? "" : ".", id_text, id_domain);
2712 }
2713
2714 /* If we are to log recipients, keep a copy of the raw ones before any possible
2715 rewriting. Must copy the count, because later ACLs and the local_scan()
2716 function may mess with the real recipients. */
2717
2718 if (LOGGING(received_recipients))
2719 {
2720 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2721 for (i = 0; i < recipients_count; i++)
2722 raw_recipients[i] = string_copy(recipients_list[i].address);
2723 raw_recipients_count = recipients_count;
2724 }
2725
2726 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2727 recipients will get here only if the conditions were right (allow_unqualified_
2728 recipient is TRUE). */
2729
2730 for (i = 0; i < recipients_count; i++)
2731 recipients_list[i].address =
2732 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2733 global_rewrite_rules, rewrite_existflags);
2734
2735 /* If there is no From: header, generate one for local (without
2736 suppress_local_fixups) or submission_mode messages. If there is no sender
2737 address, but the sender is local or this is a local delivery error, use the
2738 originator login. This shouldn't happen for genuine bounces, but might happen
2739 for autoreplies. The addition of From: must be done *before* checking for the
2740 possible addition of a Sender: header, because untrusted_set_sender allows an
2741 untrusted user to set anything in the envelope (which might then get info
2742 From:) but we still want to ensure a valid Sender: if it is required. */
2743
2744 if ( !from_header
2745 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2746 {
2747 uschar *oname = US"";
2748
2749 /* Use the originator_name if this is a locally submitted message and the
2750 caller is not trusted. For trusted callers, use it only if -F was used to
2751 force its value or if we have a non-SMTP message for which -f was not used
2752 to set the sender. */
2753
2754 if (!sender_host_address)
2755 {
2756 if (!trusted_caller || sender_name_forced ||
2757 (!smtp_input && !sender_address_forced))
2758 oname = originator_name;
2759 }
2760
2761 /* For non-locally submitted messages, the only time we use the originator
2762 name is when it was forced by the /name= option on control=submission. */
2763
2764 else if (submission_name) oname = submission_name;
2765
2766 /* Envelope sender is empty */
2767
2768 if (!*sender_address)
2769 {
2770 uschar *fromstart, *fromend;
2771
2772 fromstart = string_sprintf("%sFrom: %s%s",
2773 resent_prefix, oname, *oname ? " <" : "");
2774 fromend = *oname ? US">" : US"";
2775
2776 if (sender_local || local_error_message)
2777 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2778 local_part_quote(originator_login), qualify_domain_sender,
2779 fromend);
2780
2781 else if (submission_mode && authenticated_id)
2782 {
2783 if (!submission_domain)
2784 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2785 local_part_quote(authenticated_id), qualify_domain_sender,
2786 fromend);
2787
2788 else if (!*submission_domain) /* empty => whole address set */
2789 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2790 fromend);
2791
2792 else
2793 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2794 local_part_quote(authenticated_id), submission_domain, fromend);
2795
2796 from_header = header_last; /* To get it checked for Sender: */
2797 }
2798 }
2799
2800 /* There is a non-null envelope sender. Build the header using the original
2801 sender address, before any rewriting that might have been done while
2802 verifying it. */
2803
2804 else
2805 {
2806 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2807 oname,
2808 *oname ? " <" : "",
2809 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2810 *oname ? ">" : "");
2811
2812 from_header = header_last; /* To get it checked for Sender: */
2813 }
2814 }
2815
2816
2817 /* If the sender is local (without suppress_local_fixups), or if we are in
2818 submission mode and there is an authenticated_id, check that an existing From:
2819 is correct, and if not, generate a Sender: header, unless disabled. Any
2820 previously-existing Sender: header was removed above. Note that sender_local,
2821 as well as being TRUE if the caller of exim is not trusted, is also true if a
2822 trusted caller did not supply a -f argument for non-smtp input. To allow
2823 trusted callers to forge From: without supplying -f, we have to test explicitly
2824 here. If the From: header contains more than one address, then the call to
2825 parse_extract_address fails, and a Sender: header is inserted, as required. */
2826
2827 if ( from_header
2828 && ( active_local_from_check
2829 && ( sender_local && !trusted_caller && !suppress_local_fixups
2830 || submission_mode && authenticated_id
2831 ) ) )
2832 {
2833 BOOL make_sender = TRUE;
2834 int start, end, domain;
2835 uschar *errmess;
2836 uschar *from_address =
2837 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2838 &start, &end, &domain, FALSE);
2839 uschar *generated_sender_address;
2840
2841 generated_sender_address = submission_mode
2842 ? !submission_domain
2843 ? string_sprintf("%s@%s",
2844 local_part_quote(authenticated_id), qualify_domain_sender)
2845 : !*submission_domain /* empty => full address */
2846 ? string_sprintf("%s", authenticated_id)
2847 : string_sprintf("%s@%s",
2848 local_part_quote(authenticated_id), submission_domain)
2849 : string_sprintf("%s@%s",
2850 local_part_quote(originator_login), qualify_domain_sender);
2851
2852 /* Remove permitted prefixes and suffixes from the local part of the From:
2853 address before doing the comparison with the generated sender. */
2854
2855 if (from_address)
2856 {
2857 int slen;
2858 uschar *at = domain ? from_address + domain - 1 : NULL;
2859
2860 if (at) *at = 0;
2861 from_address += route_check_prefix(from_address, local_from_prefix);
2862 slen = route_check_suffix(from_address, local_from_suffix);
2863 if (slen > 0)
2864 {
2865 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2866 from_address += slen;
2867 }
2868 if (at) *at = '@';
2869
2870 if ( strcmpic(generated_sender_address, from_address) == 0
2871 || (!domain && strcmpic(from_address, originator_login) == 0))
2872 make_sender = FALSE;
2873 }
2874
2875 /* We have to cause the Sender header to be rewritten if there are
2876 appropriate rewriting rules. */
2877
2878 if (make_sender)
2879 if (submission_mode && !submission_name)
2880 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2881 generated_sender_address);
2882 else
2883 header_add(htype_sender, "%sSender: %s <%s>\n",
2884 resent_prefix,
2885 submission_mode? submission_name : originator_name,
2886 generated_sender_address);
2887
2888 /* Ensure that a non-null envelope sender address corresponds to the
2889 submission mode sender address. */
2890
2891 if (submission_mode && *sender_address)
2892 {
2893 if (!sender_address_unrewritten)
2894 sender_address_unrewritten = sender_address;
2895 sender_address = generated_sender_address;
2896 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2897 log_write(L_address_rewrite, LOG_MAIN,
2898 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2899 sender_address_unrewritten, generated_sender_address);
2900 }
2901 }
2902
2903 /* If there are any rewriting rules, apply them to the sender address, unless
2904 it has already been rewritten as part of verification for SMTP input. */
2905
2906 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2907 {
2908 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2909 global_rewrite_rules, rewrite_existflags);
2910 DEBUG(D_receive|D_rewrite)
2911 debug_printf("rewritten sender = %s\n", sender_address);
2912 }
2913
2914
2915 /* The headers must be run through rewrite_header(), because it ensures that
2916 addresses are fully qualified, as well as applying any rewriting rules that may
2917 exist.
2918
2919 Qualification of header addresses in a message from a remote host happens only
2920 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2921 appropriate. For local messages, qualification always happens, unless -bnq is
2922 used to explicitly suppress it. No rewriting is done for an unqualified address
2923 that is left untouched.
2924
2925 We start at the second header, skipping our own Received:. This rewriting is
2926 documented as happening *after* recipient addresses are taken from the headers
2927 by the -t command line option. An added Sender: gets rewritten here. */
2928
2929 for (h = header_list->next; h; h = h->next)
2930 {
2931 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2932 rewrite_existflags, TRUE);
2933 if (newh) h = newh;
2934 }
2935
2936
2937 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2938 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2939 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2940 exists, this applies to the set of resent- headers rather than the normal set.
2941
2942 The requirement for a recipient header has been removed in RFC 2822. At this
2943 point in the code, earlier versions of Exim added a To: header for locally
2944 submitted messages, and an empty Bcc: header for others. In the light of the
2945 changes in RFC 2822, this was dropped in November 2003. */
2946
2947
2948 /* If there is no date header, generate one if the message originates locally
2949 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2950 submission mode flag is set. Messages without Date: are not valid, but it seems
2951 to be more confusing if Exim adds one to all remotely-originated messages.
2952 As per Message-Id, we prepend if resending, else append.
2953 */
2954
2955 if ( !date_header_exists
2956 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2957 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2958 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2959
2960 search_tidyup(); /* Free any cached resources */
2961
2962 /* Show the complete set of headers if debugging. Note that the first one (the
2963 new Received:) has not yet been set. */
2964
2965 DEBUG(D_receive)
2966 {
2967 debug_printf(">>Headers after rewriting and local additions:\n");
2968 for (h = header_list->next; h; h = h->next)
2969 debug_printf("%c %s", h->type, h->text);
2970 debug_printf("\n");
2971 }
2972
2973 /* The headers are now complete in store. If we are running in filter
2974 testing mode, that is all this function does. Return TRUE if the message
2975 ended with a dot. */
2976
2977 if (filter_test != FTEST_NONE)
2978 {
2979 process_info[process_info_len] = 0;
2980 return message_ended == END_DOT;
2981 }
2982
2983 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2984 think more if it could be handled. Cannot do onward CHUNKING unless
2985 inbound is, but inbound chunking ought to be ok with outbound plain.
2986 Could we do onward CHUNKING given inbound CHUNKING?
2987 */
2988 if (chunking_state > CHUNKING_OFFERED)
2989 cancel_cutthrough_connection(FALSE, US"chunking active");
2990
2991 /* Cutthrough delivery:
2992 We have to create the Received header now rather than at the end of reception,
2993 so the timestamp behaviour is a change to the normal case.
2994 Having created it, send the headers to the destination. */
2995
2996 if (cutthrough.fd >= 0 && cutthrough.delivery)
2997 {
2998 if (received_count > received_headers_max)
2999 {
3000 cancel_cutthrough_connection(TRUE, US"too many headers");
3001 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3002 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3003 "Too many \"Received\" headers",
3004 sender_address,
3005 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3006 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3007 message_id[0] = 0; /* Indicate no message accepted */
3008 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3009 goto TIDYUP; /* Skip to end of function */
3010 }
3011 received_header_gen();
3012 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3013 (void) cutthrough_headers_send();
3014 }
3015
3016
3017 /* Open a new spool file for the data portion of the message. We need
3018 to access it both via a file descriptor and a stream. Try to make the
3019 directory if it isn't there. */
3020
3021 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3022 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3023
3024 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3025 {
3026 if (errno == ENOENT)
3027 {
3028 (void) directory_make(spool_directory,
3029 spool_sname(US"input", message_subdir),
3030 INPUT_DIRECTORY_MODE, TRUE);
3031 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3032 }
3033 if (data_fd < 0)
3034 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3035 spool_name, strerror(errno));
3036 }
3037
3038 /* Make sure the file's group is the Exim gid, and double-check the mode
3039 because the group setting doesn't always get set automatically. */
3040
3041 if (fchown(data_fd, exim_uid, exim_gid))
3042 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3043 "Failed setting ownership on spool file %s: %s",
3044 spool_name, strerror(errno));
3045 (void)fchmod(data_fd, SPOOL_MODE);
3046
3047 /* We now have data file open. Build a stream for it and lock it. We lock only
3048 the first line of the file (containing the message ID) because otherwise there
3049 are problems when Exim is run under Cygwin (I'm told). See comments in
3050 spool_in.c, where the same locking is done. */
3051
3052 data_file = fdopen(data_fd, "w+");
3053 lock_data.l_type = F_WRLCK;
3054 lock_data.l_whence = SEEK_SET;
3055 lock_data.l_start = 0;
3056 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3057
3058 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3059 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3060 errno, strerror(errno));
3061
3062 /* We have an open, locked data file. Write the message id to it to make it
3063 self-identifying. Then read the remainder of the input of this message and
3064 write it to the data file. If the variable next != NULL, it contains the first
3065 data line (which was read as a header but then turned out not to have the right
3066 format); write it (remembering that it might contain binary zeros). The result
3067 of fwrite() isn't inspected; instead we call ferror() below. */
3068
3069 fprintf(data_file, "%s-D\n", message_id);
3070 if (next)
3071 {
3072 uschar *s = next->text;
3073 int len = next->slen;
3074 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3075 body_linecount++; /* Assumes only 1 line */
3076 }
3077
3078 /* Note that we might already be at end of file, or the logical end of file
3079 (indicated by '.'), or might have encountered an error while writing the
3080 message id or "next" line. */
3081
3082 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3083 {
3084 if (smtp_input)
3085 {
3086 message_ended = chunking_state <= CHUNKING_OFFERED
3087 ? read_message_data_smtp(data_file)
3088 : spool_wireformat
3089 ? read_message_bdat_smtp_wire(data_file)
3090 : read_message_bdat_smtp(data_file);
3091 receive_linecount++; /* The terminating "." line */
3092 }
3093 else message_ended = read_message_data(data_file);
3094
3095 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3096 message_linecount += body_linecount;
3097
3098 switch (message_ended)
3099 {
3100 /* Handle premature termination of SMTP */
3101
3102 case END_EOF:
3103 if (smtp_input)
3104 {
3105 Uunlink(spool_name); /* Lose data file when closed */
3106 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3107 message_id[0] = 0; /* Indicate no message accepted */
3108 smtp_reply = handle_lost_connection(US"");
3109 smtp_yield = FALSE;
3110 goto TIDYUP; /* Skip to end of function */
3111 }
3112 break;
3113
3114 /* Handle message that is too big. Don't use host_or_ident() in the log
3115 message; we want to see the ident value even for non-remote messages. */
3116
3117 case END_SIZE:
3118 Uunlink(spool_name); /* Lose the data file when closed */
3119 cancel_cutthrough_connection(TRUE, US"mail too big");
3120 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3121
3122 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3123 "message too big: read=%d max=%d",
3124 sender_address,
3125 sender_fullhost ? " H=" : "",
3126 sender_fullhost ? sender_fullhost : US"",
3127 sender_ident ? " U=" : "",
3128 sender_ident ? sender_ident : US"",
3129 message_size,
3130 thismessage_size_limit);
3131
3132 if (smtp_input)
3133 {
3134 smtp_reply = US"552 Message size exceeds maximum permitted";
3135 message_id[0] = 0; /* Indicate no message accepted */
3136 goto TIDYUP; /* Skip to end of function */
3137 }
3138 else
3139 {
3140 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3141 give_local_error(ERRMESS_TOOBIG,
3142 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3143 US"message rejected: ", error_rc, data_file, header_list);
3144 /* Does not return */
3145 }
3146 break;
3147
3148 /* Handle bad BDAT protocol sequence */
3149
3150 case END_PROTOCOL:
3151 Uunlink(spool_name); /* Lose the data file when closed */
3152 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3153 smtp_reply = US""; /* Response already sent */
3154 message_id[0] = 0; /* Indicate no message accepted */
3155 goto TIDYUP; /* Skip to end of function */
3156 }
3157 }
3158
3159 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3160 example, there may be some expansion in an ACL that uses a timer.) */
3161
3162 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3163
3164 /* The message body has now been read into the data file. Call fflush() to
3165 empty the buffers in C, and then call fsync() to get the data written out onto
3166 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3167 having to do this). If there was an I/O error on either input or output,
3168 attempt to send an error message, and unlink the spool file. For non-SMTP input
3169 we can then give up. Note that for SMTP input we must swallow the remainder of
3170 the input in cases of output errors, since the far end doesn't expect to see
3171 anything until the terminating dot line is sent. */
3172
3173 if (fflush(data_file) == EOF || ferror(data_file) ||
3174 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3175 {
3176 uschar *msg_errno = US strerror(errno);
3177 BOOL input_error = (receive_ferror)() != 0;
3178 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3179 input_error? "Input read" : "Spool write",
3180 msg_errno,
3181 sender_fullhost ? sender_fullhost : sender_ident);
3182
3183 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3184 Uunlink(spool_name); /* Lose the data file */
3185 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3186
3187 if (smtp_input)
3188 {
3189 if (input_error)
3190 smtp_reply = US"451 Error while reading input data";
3191 else
3192 {
3193 smtp_reply = US"451 Error while writing spool file";
3194 receive_swallow_smtp();
3195 }
3196 message_id[0] = 0; /* Indicate no message accepted */
3197 goto TIDYUP; /* Skip to end of function */
3198 }
3199
3200 else
3201 {
3202 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3203 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3204 header_list);
3205 /* Does not return */
3206 }
3207 }
3208
3209
3210 /* No I/O errors were encountered while writing the data file. */
3211
3212 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3213 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3214
3215
3216 /* If there were any bad addresses extracted by -t, or there were no recipients
3217 left after -t, send a message to the sender of this message, or write it to
3218 stderr if the error handling option is set that way. Note that there may
3219 legitimately be no recipients for an SMTP message if they have all been removed
3220 by "discard".
3221
3222 We need to rewind the data file in order to read it. In the case of no
3223 recipients or stderr error writing, throw the data file away afterwards, and
3224 exit. (This can't be SMTP, which always ensures there's at least one
3225 syntactically good recipient address.) */
3226
3227 if (extract_recip && (bad_addresses || recipients_count == 0))
3228 {
3229 DEBUG(D_receive)
3230 {
3231 if (recipients_count == 0) debug_printf("*** No recipients\n");
3232 if (bad_addresses)
3233 {
3234 error_block *eblock = bad_addresses;
3235 debug_printf("*** Bad address(es)\n");
3236 while (eblock != NULL)
3237 {
3238 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3239 eblock = eblock->next;
3240 }
3241 }
3242 }
3243
3244 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3245
3246 /* If configured to send errors to the sender, but this fails, force
3247 a failure error code. We use a special one for no recipients so that it
3248 can be detected by the autoreply transport. Otherwise error_rc is set to
3249 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3250 it is EXIT_SUCCESS. */
3251
3252 if (error_handling == ERRORS_SENDER)
3253 {
3254 if (!moan_to_sender(
3255 (bad_addresses == NULL)?
3256 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3257 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3258 bad_addresses, header_list, data_file, FALSE))
3259 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3260 }
3261 else
3262 {
3263 if (!bad_addresses)
3264 {
3265 if (extracted_ignored)
3266 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3267 else
3268 fprintf(stderr, "exim: no recipients in message\n");
3269 }
3270 else
3271 {
3272 fprintf(stderr, "exim: invalid address%s",
3273 (bad_addresses->next == NULL)? ":" : "es:\n");
3274 while (bad_addresses != NULL)
3275 {
3276 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3277 bad_addresses->text2);
3278 bad_addresses = bad_addresses->next;
3279 }
3280 }
3281 }
3282
3283 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3284 {
3285 Uunlink(spool_name);
3286 (void)fclose(data_file);
3287 exim_exit(error_rc, US"receiving");
3288 }
3289 }
3290
3291 /* Data file successfully written. Generate text for the Received: header by
3292 expanding the configured string, and adding a timestamp. By leaving this
3293 operation till now, we ensure that the timestamp is the time that message
3294 reception was completed. However, this is deliberately done before calling the
3295 data ACL and local_scan().
3296
3297 This Received: header may therefore be inspected by the data ACL and by code in
3298 the local_scan() function. When they have run, we update the timestamp to be
3299 the final time of reception.
3300
3301 If there is just one recipient, set up its value in the $received_for variable
3302 for use when we generate the Received: header.
3303
3304 Note: the checking for too many Received: headers is handled by the delivery
3305 code. */
3306 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3307
3308 if (!received_header->text) /* Non-cutthrough case */
3309 {
3310 received_header_gen();
3311
3312 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3313
3314 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3315 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3316
3317 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3318 now, before running the DATA ACL. */
3319
3320 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3321 }
3322 else
3323 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3324 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3325
3326 /* If an ACL is specified for checking things at this stage of reception of a
3327 message, run it, unless all the recipients were removed by "discard" in earlier
3328 ACLs. That is the only case in which recipients_count can be zero at this
3329 stage. Set deliver_datafile to point to the data file so that $message_body and
3330 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3331 */
3332
3333 deliver_datafile = data_fd;
3334 user_msg = NULL;
3335
3336 enable_dollar_recipients = TRUE;
3337
3338 if (recipients_count == 0)
3339 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3340
3341 else
3342 {
3343 /* Handle interactive SMTP messages */
3344
3345 if (smtp_input && !smtp_batched_input)
3346 {
3347
3348 #ifndef DISABLE_DKIM
3349 if (!dkim_disable_verify)
3350 {
3351 /* Finish verification */
3352 dkim_exim_verify_finish();
3353
3354 /* Check if we must run the DKIM ACL */
3355 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3356 {
3357 uschar * dkim_verify_signers_expanded =
3358 expand_string(dkim_verify_signers);
3359 gstring * results = NULL;
3360 int signer_sep = 0;
3361 const uschar * ptr;
3362 uschar * item;
3363 gstring * seen_items = NULL;
3364 int old_pool = store_pool;
3365
3366 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3367
3368 if (!(ptr = dkim_verify_signers_expanded))
3369 log_write(0, LOG_MAIN|LOG_PANIC,
3370 "expansion of dkim_verify_signers option failed: %s",
3371 expand_string_message);
3372
3373 /* Default to OK when no items are present */
3374 rc = OK;
3375 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3376 {
3377 /* Prevent running ACL for an empty item */
3378 if (!item || !*item) continue;
3379
3380 /* Only run ACL once for each domain or identity,
3381 no matter how often it appears in the expanded list. */
3382 if (seen_items)
3383 {
3384 uschar * seen_item;
3385 const uschar * seen_items_list = string_from_gstring(seen_items);
3386 int seen_sep = ':';
3387 BOOL seen_this_item = FALSE;
3388
3389 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3390 NULL, 0)))
3391 if (Ustrcmp(seen_item,item) == 0)
3392 {
3393 seen_this_item = TRUE;
3394 break;
3395 }
3396
3397 if (seen_this_item)
3398 {
3399 DEBUG(D_receive)
3400 debug_printf("acl_smtp_dkim: skipping signer %s, "
3401 "already seen\n", item);
3402 continue;
3403 }
3404
3405 seen_items = string_catn(seen_items, US":", 1);
3406 }
3407 seen_items = string_cat(seen_items, item);
3408
3409 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3410 if (rc != OK)
3411 {
3412 DEBUG(D_receive)
3413 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3414 "skipping remaining items\n", rc, item);
3415 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3416 break;
3417 }
3418 }
3419 dkim_verify_status = string_from_gstring(results);
3420 store_pool = old_pool;
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)
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 else
3440 dkim_exim_verify_log_all();
3441 }
3442 #endif /* DISABLE_DKIM */
3443
3444 #ifdef WITH_CONTENT_SCAN
3445 if ( recipients_count > 0
3446 && acl_smtp_mime
3447 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3448 )
3449 goto TIDYUP;
3450 #endif /* WITH_CONTENT_SCAN */
3451
3452 #ifdef EXPERIMENTAL_DMARC
3453 dmarc_up = dmarc_store_data(from_header);
3454 #endif /* EXPERIMENTAL_DMARC */
3455
3456 #ifndef DISABLE_PRDR
3457 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3458 {
3459 unsigned int c;
3460 int all_pass = OK;
3461 int all_fail = FAIL;
3462
3463 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3464 /* Loop through recipients, responses must be in same order received */
3465 for (c = 0; recipients_count > c; c++)
3466 {
3467 uschar * addr= recipients_list[c].address;
3468 uschar * msg= US"PRDR R=<%s> %s";
3469 uschar * code;
3470 DEBUG(D_receive)
3471 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3472 addr, c+1, recipients_count);
3473 rc = acl_check(ACL_WHERE_PRDR, addr,
3474 acl_smtp_data_prdr, &user_msg, &log_msg);
3475
3476 /* If any recipient rejected content, indicate it in final message */
3477 all_pass |= rc;
3478 /* If all recipients rejected, indicate in final message */
3479 all_fail &= rc;
3480
3481 switch (rc)
3482 {
3483 case OK: case DISCARD: code = US"250"; break;
3484 case DEFER: code = US"450"; break;
3485 default: code = US"550"; break;
3486 }
3487 if (user_msg != NULL)
3488 smtp_user_msg(code, user_msg);
3489 else
3490 {
3491 switch (rc)
3492 {
3493 case OK: case DISCARD:
3494 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3495 case DEFER:
3496 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3497 default:
3498 msg = string_sprintf(CS msg, addr, "refusal"); break;
3499 }
3500 smtp_user_msg(code, msg);
3501 }