Bugzilla 1041: pull patch id=425, DCC fixes.
[exim.git] / src / src / receive.c
1 /* $Cambridge: exim/src/src/receive.c,v 1.55 2010/06/05 11:13:30 pdp Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2009 */
8 /* See the file NOTICE for conditions of use and distribution. */
9
10 /* Code for receiving a message and setting up spool files. */
11
12 #include "exim.h"
13
14 #ifdef EXPERIMENTAL_DCC
15 extern int dcc_ok;
16 #endif
17
18 /*************************************************
19 * Local static variables *
20 *************************************************/
21
22 static FILE *data_file = NULL;
23 static int data_fd = -1;
24 static uschar spool_name[256];
25
26
27
28 /*************************************************
29 * Non-SMTP character reading functions *
30 *************************************************/
31
32 /* These are the default functions that are set up in the variables such as
33 receive_getc initially. They just call the standard functions, passing stdin as
34 the file. (When SMTP input is occurring, different functions are used by
35 changing the pointer variables.) */
36
37 int
38 stdin_getc(void)
39 {
40 return getc(stdin);
41 }
42
43 int
44 stdin_ungetc(int c)
45 {
46 return ungetc(c, stdin);
47 }
48
49 int
50 stdin_feof(void)
51 {
52 return feof(stdin);
53 }
54
55 int
56 stdin_ferror(void)
57 {
58 return ferror(stdin);
59 }
60
61
62
63
64 /*************************************************
65 * Check that a set sender is allowed *
66 *************************************************/
67
68 /* This function is called when a local caller sets an explicit sender address.
69 It checks whether this is permitted, which it is for trusted callers.
70 Otherwise, it must match the pattern(s) in untrusted_set_sender.
71
72 Arguments: the proposed sender address
73 Returns: TRUE for a trusted caller
74 TRUE if the address has been set, untrusted_set_sender has been
75 set, and the address matches something in the list
76 FALSE otherwise
77 */
78
79 BOOL
80 receive_check_set_sender(uschar *newsender)
81 {
82 uschar *qnewsender;
83 if (trusted_caller) return TRUE;
84 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
85 qnewsender = (Ustrchr(newsender, '@') != NULL)?
86 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
87 return
88 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
89 0, NULL) == OK;
90 }
91
92
93
94
95 /*************************************************
96 * Read space info for a partition *
97 *************************************************/
98
99 /* This function is called by receive_check_fs() below, and also by string
100 expansion for variables such as $spool_space. The field names for the statvfs
101 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
102 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
103 have inodes, and they return -1 for the number available.
104
105 Later: It turns out that some file systems that do not have the concept of
106 inodes return 0 rather than -1. Such systems should also return 0 for the total
107 number of inodes, so we require that to be greater than zero before returning
108 an inode count.
109
110 Arguments:
111 isspool TRUE for spool partition, FALSE for log partition
112 inodeptr address of int to receive inode count; -1 if there isn't one
113
114 Returns: available on-root space, in kilobytes
115 -1 for log partition if there isn't one
116
117 All values are -1 if the STATFS functions are not available.
118 */
119
120 int
121 receive_statvfs(BOOL isspool, int *inodeptr)
122 {
123 #ifdef HAVE_STATFS
124 struct STATVFS statbuf;
125 uschar *path;
126 uschar *name;
127 uschar buffer[1024];
128
129 /* The spool directory must always exist. */
130
131 if (isspool)
132 {
133 path = spool_directory;
134 name = US"spool";
135 }
136
137 /* Need to cut down the log file path to the directory, and to ignore any
138 appearance of "syslog" in it. */
139
140 else
141 {
142 int sep = ':'; /* Not variable - outside scripts use */
143 uschar *p = log_file_path;
144 name = US"log";
145
146 /* An empty log_file_path means "use the default". This is the same as an
147 empty item in a list. */
148
149 if (*p == 0) p = US":";
150 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
151 {
152 if (Ustrcmp(path, "syslog") != 0) break;
153 }
154
155 if (path == NULL) /* No log files */
156 {
157 *inodeptr = -1;
158 return -1;
159 }
160
161 /* An empty string means use the default, which is in the spool directory.
162 But don't just use the spool directory, as it is possible that the log
163 subdirectory has been symbolically linked elsewhere. */
164
165 if (path[0] == 0)
166 {
167 sprintf(CS buffer, CS"%s/log", CS spool_directory);
168 path = buffer;
169 }
170 else
171 {
172 uschar *cp;
173 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
174 }
175 }
176
177 /* We now have the path; do the business */
178
179 memset(&statbuf, 0, sizeof(statbuf));
180
181 if (STATVFS(CS path, &statbuf) != 0)
182 {
183 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
184 "%s directory %s: %s", name, spool_directory, strerror(errno));
185 smtp_closedown(US"spool or log directory problem");
186 exim_exit(EXIT_FAILURE);
187 }
188
189 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
190
191 /* Disks are getting huge. Take care with computing the size in kilobytes. */
192
193 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
194
195 /* Unable to find partition sizes in this environment. */
196
197 #else
198 *inodeptr = -1;
199 return -1;
200 #endif
201 }
202
203
204
205
206 /*************************************************
207 * Check space on spool and log partitions *
208 *************************************************/
209
210 /* This function is called before accepting a message; if any thresholds are
211 set, it checks them. If a message_size is supplied, it checks that there is
212 enough space for that size plus the threshold - i.e. that the message won't
213 reduce the space to the threshold. Not all OS have statvfs(); for those that
214 don't, this function always returns TRUE. For some OS the old function and
215 struct name statfs is used; that is handled by a macro, defined in exim.h.
216
217 Arguments:
218 msg_size the (estimated) size of an incoming message
219
220 Returns: FALSE if there isn't enough space, or if the information cannot
221 be obtained
222 TRUE if no check was done or there is enough space
223 */
224
225 BOOL
226 receive_check_fs(int msg_size)
227 {
228 int space, inodes;
229
230 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
231 {
232 space = receive_statvfs(TRUE, &inodes);
233
234 DEBUG(D_receive)
235 debug_printf("spool directory space = %dK inodes = %d "
236 "check_space = %dK inodes = %d msg_size = %d\n",
237 space, inodes, check_spool_space, check_spool_inodes, msg_size);
238
239 if ((space >= 0 && space < check_spool_space) ||
240 (inodes >= 0 && inodes < check_spool_inodes))
241 {
242 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
243 "inodes=%d", space, inodes);
244 return FALSE;
245 }
246 }
247
248 if (check_log_space > 0 || check_log_inodes > 0)
249 {
250 space = receive_statvfs(FALSE, &inodes);
251
252 DEBUG(D_receive)
253 debug_printf("log directory space = %dK inodes = %d "
254 "check_space = %dK inodes = %d\n",
255 space, inodes, check_log_space, check_log_inodes);
256
257 if ((space >= 0 && space < check_log_space) ||
258 (inodes >= 0 && inodes < check_log_inodes))
259 {
260 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
261 "inodes=%d", space, inodes);
262 return FALSE;
263 }
264 }
265
266 return TRUE;
267 }
268
269
270
271 /*************************************************
272 * Bomb out while reading a message *
273 *************************************************/
274
275 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
276 received, or if there is a timeout. A rarer case might be if the log files are
277 screwed up and Exim can't open them to record a message's arrival. Handling
278 that case is done by setting a flag to cause the log functions to call this
279 function if there is an ultimate disaster. That is why it is globally
280 accessible.
281
282 Arguments:
283 reason text reason to pass to the not-quit ACL
284 msg default SMTP response to give if in an SMTP session
285 Returns: it doesn't
286 */
287
288 void
289 receive_bomb_out(uschar *reason, uschar *msg)
290 {
291 /* If spool_name is set, it contains the name of the data file that is being
292 written. Unlink it before closing so that it cannot be picked up by a delivery
293 process. Ensure that any header file is also removed. */
294
295 if (spool_name[0] != 0)
296 {
297 Uunlink(spool_name);
298 spool_name[Ustrlen(spool_name) - 1] = 'H';
299 Uunlink(spool_name);
300 }
301
302 /* Now close the file if it is open, either as a fd or a stream. */
303
304 if (data_file != NULL) (void)fclose(data_file);
305 else if (data_fd >= 0) (void)close(data_fd);
306
307 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
308 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
309 SMTP response. */
310
311 if (smtp_input)
312 {
313 if (smtp_batched_input)
314 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
315 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
316 smtp_active_hostname, msg);
317 }
318
319 /* Exit from the program (non-BSMTP cases) */
320
321 exim_exit(EXIT_FAILURE);
322 }
323
324
325 /*************************************************
326 * Data read timeout *
327 *************************************************/
328
329 /* Handler function for timeouts that occur while reading the data that
330 comprises a message.
331
332 Argument: the signal number
333 Returns: nothing
334 */
335
336 static void
337 data_timeout_handler(int sig)
338 {
339 uschar *msg = NULL;
340
341 sig = sig; /* Keep picky compilers happy */
342
343 if (smtp_input)
344 {
345 msg = US"SMTP incoming data timeout";
346 log_write(L_lost_incoming_connection,
347 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
348 "from %s F=<%s>",
349 (sender_fullhost != NULL)? sender_fullhost : US"local process",
350 sender_address);
351 }
352 else
353 {
354 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
355 log_write(L_lost_incoming_connection,
356 LOG_MAIN, "timed out while reading local message");
357 }
358
359 receive_bomb_out(US"data-timeout", msg); /* Does not return */
360 }
361
362
363
364 /*************************************************
365 * local_scan() timeout *
366 *************************************************/
367
368 /* Handler function for timeouts that occur while running a local_scan()
369 function.
370
371 Argument: the signal number
372 Returns: nothing
373 */
374
375 static void
376 local_scan_timeout_handler(int sig)
377 {
378 sig = sig; /* Keep picky compilers happy */
379 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
380 "message temporarily rejected (size %d)", message_size);
381 /* Does not return */
382 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
383 }
384
385
386
387 /*************************************************
388 * local_scan() crashed *
389 *************************************************/
390
391 /* Handler function for signals that occur while running a local_scan()
392 function.
393
394 Argument: the signal number
395 Returns: nothing
396 */
397
398 static void
399 local_scan_crash_handler(int sig)
400 {
401 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
402 "signal %d - message temporarily rejected (size %d)", sig, message_size);
403 /* Does not return */
404 receive_bomb_out(US"local-scan-error", US"local verification problem");
405 }
406
407
408 /*************************************************
409 * SIGTERM or SIGINT received *
410 *************************************************/
411
412 /* Handler for SIGTERM or SIGINT signals that occur while reading the
413 data that comprises a message.
414
415 Argument: the signal number
416 Returns: nothing
417 */
418
419 static void
420 data_sigterm_sigint_handler(int sig)
421 {
422 uschar *msg = NULL;
423
424 if (smtp_input)
425 {
426 msg = US"Service not available - SIGTERM or SIGINT received";
427 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
428 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
429 }
430 else
431 {
432 if (filter_test == FTEST_NONE)
433 {
434 fprintf(stderr, "\nexim: %s received - message abandoned\n",
435 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
436 log_write(0, LOG_MAIN, "%s received while reading local message",
437 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
438 }
439 }
440
441 receive_bomb_out(US"signal-exit", msg); /* Does not return */
442 }
443
444
445
446 /*************************************************
447 * Add new recipient to list *
448 *************************************************/
449
450 /* This function builds a list of recipient addresses in argc/argv
451 format.
452
453 Arguments:
454 recipient the next address to add to recipients_list
455 pno parent number for fixed aliases; -1 otherwise
456
457 Returns: nothing
458 */
459
460 void
461 receive_add_recipient(uschar *recipient, int pno)
462 {
463 if (recipients_count >= recipients_list_max)
464 {
465 recipient_item *oldlist = recipients_list;
466 int oldmax = recipients_list_max;
467 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
468 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
469 if (oldlist != NULL)
470 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
471 }
472
473 recipients_list[recipients_count].address = recipient;
474 recipients_list[recipients_count].pno = pno;
475 #ifdef EXPERIMENTAL_BRIGHTMAIL
476 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
477 /* reset optin string pointer for next recipient */
478 bmi_current_optin = NULL;
479 #endif
480 recipients_list[recipients_count++].errors_to = NULL;
481 }
482
483
484
485
486 /*************************************************
487 * Remove a recipient from the list *
488 *************************************************/
489
490 /* This function is provided for local_scan() to use.
491
492 Argument:
493 recipient address to remove
494
495 Returns: TRUE if it did remove something; FALSE otherwise
496 */
497
498 BOOL
499 receive_remove_recipient(uschar *recipient)
500 {
501 int count;
502 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
503 recipient);
504 for (count = 0; count < recipients_count; count++)
505 {
506 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
507 {
508 if ((--recipients_count - count) > 0)
509 memmove(recipients_list + count, recipients_list + count + 1,
510 (recipients_count - count)*sizeof(recipient_item));
511 return TRUE;
512 }
513 }
514 return FALSE;
515 }
516
517
518
519
520
521 /*************************************************
522 * Read data portion of a non-SMTP message *
523 *************************************************/
524
525 /* This function is called to read the remainder of a message (following the
526 header) when the input is not from SMTP - we are receiving a local message on
527 a standard input stream. The message is always terminated by EOF, and is also
528 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
529 two cases for maximum efficiency.
530
531 Ensure that the body ends with a newline. This will naturally be the case when
532 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
533 as "sequences of lines" - this of course strictly applies only to SMTP, but
534 deliveries into BSD-type mailbox files also require it. Exim used to have a
535 flag for doing this at delivery time, but as it was always set for all
536 transports, I decided to simplify things by putting the check here instead.
537
538 There is at least one MUA (dtmail) that sends CRLF via this interface, and
539 other programs are known to do this as well. Exim used to have a option for
540 dealing with this: in July 2003, after much discussion, the code has been
541 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
542
543 However, for the case when a dot on a line by itself terminates a message, the
544 only recognized terminating sequences before and after the dot are LF and CRLF.
545 Otherwise, having read EOL . CR, you don't know whether to read another
546 character or not.
547
548 Internally, in messages stored in Exim's spool files, LF is used as the line
549 terminator. Under the new regime, bare CRs will no longer appear in these
550 files.
551
552 Arguments:
553 fout a FILE to which to write the message
554
555 Returns: One of the END_xxx values indicating why it stopped reading
556 */
557
558 static int
559 read_message_data(FILE *fout)
560 {
561 int ch_state;
562 register int ch;
563 register int linelength = 0;
564
565 /* Handle the case when only EOF terminates the message */
566
567 if (!dot_ends)
568 {
569 register int last_ch = '\n';
570
571 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
572 {
573 if (ch == 0) body_zerocount++;
574 if (last_ch == '\r' && ch != '\n')
575 {
576 if (linelength > max_received_linelength)
577 max_received_linelength = linelength;
578 linelength = 0;
579 if (fputc('\n', fout) == EOF) return END_WERROR;
580 message_size++;
581 body_linecount++;
582 }
583 if (ch == '\r') continue;
584
585 if (fputc(ch, fout) == EOF) return END_WERROR;
586 if (ch == '\n')
587 {
588 if (linelength > max_received_linelength)
589 max_received_linelength = linelength;
590 linelength = 0;
591 body_linecount++;
592 }
593 else linelength++;
594 if (++message_size > thismessage_size_limit) return END_SIZE;
595 }
596
597 if (last_ch != '\n')
598 {
599 if (linelength > max_received_linelength)
600 max_received_linelength = linelength;
601 if (fputc('\n', fout) == EOF) return END_WERROR;
602 message_size++;
603 body_linecount++;
604 }
605
606 return END_EOF;
607 }
608
609 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
610
611 ch_state = 1;
612
613 while ((ch = (receive_getc)()) != EOF)
614 {
615 if (ch == 0) body_zerocount++;
616 switch (ch_state)
617 {
618 case 0: /* Normal state (previous char written) */
619 if (ch == '\n')
620 {
621 body_linecount++;
622 if (linelength > max_received_linelength)
623 max_received_linelength = linelength;
624 linelength = -1;
625 ch_state = 1;
626 }
627 else if (ch == '\r')
628 { ch_state = 2; continue; }
629 break;
630
631 case 1: /* After written "\n" */
632 if (ch == '.') { ch_state = 3; continue; }
633 if (ch != '\n') ch_state = 0; else linelength = -1;
634 break;
635
636 case 2:
637 body_linecount++; /* After unwritten "\r" */
638 if (linelength > max_received_linelength)
639 max_received_linelength = linelength;
640 if (ch == '\n')
641 {
642 ch_state = 1;
643 linelength = -1;
644 }
645 else
646 {
647 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
648 if (ch == '\r') continue;
649 ch_state = 0;
650 linelength = 0;
651 }
652 break;
653
654 case 3: /* After "\n." (\n written, dot not) */
655 if (ch == '\n') return END_DOT;
656 if (ch == '\r') { ch_state = 4; continue; }
657 message_size++;
658 linelength++;
659 if (fputc('.', fout) == EOF) return END_WERROR;
660 ch_state = 0;
661 break;
662
663 case 4: /* After "\n.\r" (\n written, rest not) */
664 if (ch == '\n') return END_DOT;
665 message_size += 2;
666 body_linecount++;
667 if (fputs(".\n", fout) == EOF) return END_WERROR;
668 if (ch == '\r') { ch_state = 2; continue; }
669 ch_state = 0;
670 break;
671 }
672
673 linelength++;
674 if (fputc(ch, fout) == EOF) return END_WERROR;
675 if (++message_size > thismessage_size_limit) return END_SIZE;
676 }
677
678 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
679 the message ends with a newline, and we must also write any characters that
680 were saved up while testing for an ending dot. */
681
682 if (ch_state != 1)
683 {
684 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
685 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
686 message_size += Ustrlen(ends[ch_state]);
687 body_linecount++;
688 }
689
690 return END_EOF;
691 }
692
693
694
695
696 /*************************************************
697 * Read data portion of an SMTP message *
698 *************************************************/
699
700 /* This function is called to read the remainder of an SMTP message (after the
701 headers), or to skip over it when an error has occurred. In this case, the
702 output file is passed as NULL.
703
704 If any line begins with a dot, that character is skipped. The input should only
705 be successfully terminated by CR LF . CR LF unless it is local (non-network)
706 SMTP, in which case the CRs are optional, but...
707
708 FUDGE: It seems that sites on the net send out messages with just LF
709 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
710 we make the CRs optional in all cases.
711
712 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
713 well, so that there are no CRs in spooled messages. However, the message
714 terminating dot is not recognized between two bare CRs.
715
716 Arguments:
717 fout a FILE to which to write the message; NULL if skipping
718
719 Returns: One of the END_xxx values indicating why it stopped reading
720 */
721
722 static int
723 read_message_data_smtp(FILE *fout)
724 {
725 int ch_state = 0;
726 register int ch;
727 register int linelength = 0;
728
729 while ((ch = (receive_getc)()) != EOF)
730 {
731 if (ch == 0) body_zerocount++;
732 switch (ch_state)
733 {
734 case 0: /* After LF or CRLF */
735 if (ch == '.')
736 {
737 ch_state = 3;
738 continue; /* Don't ever write . after LF */
739 }
740 ch_state = 1;
741
742 /* Else fall through to handle as normal uschar. */
743
744 case 1: /* Normal state */
745 if (ch == '\n')
746 {
747 ch_state = 0;
748 body_linecount++;
749 if (linelength > max_received_linelength)
750 max_received_linelength = linelength;
751 linelength = -1;
752 }
753 else if (ch == '\r')
754 {
755 ch_state = 2;
756 continue;
757 }
758 break;
759
760 case 2: /* After (unwritten) CR */
761 body_linecount++;
762 if (linelength > max_received_linelength)
763 max_received_linelength = linelength;
764 linelength = -1;
765 if (ch == '\n')
766 {
767 ch_state = 0;
768 }
769 else
770 {
771 message_size++;
772 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
773 if (ch != '\r') ch_state = 1; else continue;
774 }
775 break;
776
777 case 3: /* After [CR] LF . */
778 if (ch == '\n')
779 return END_DOT;
780 if (ch == '\r')
781 {
782 ch_state = 4;
783 continue;
784 }
785 ch_state = 1; /* The dot itself is removed */
786 break;
787
788 case 4: /* After [CR] LF . CR */
789 if (ch == '\n') return END_DOT;
790 message_size++;
791 body_linecount++;
792 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
793 if (ch == '\r')
794 {
795 ch_state = 2;
796 continue;
797 }
798 ch_state = 1;
799 break;
800 }
801
802 /* Add the character to the spool file, unless skipping; then loop for the
803 next. */
804
805 message_size++;
806 linelength++;
807 if (fout != NULL)
808 {
809 if (fputc(ch, fout) == EOF) return END_WERROR;
810 if (message_size > thismessage_size_limit) return END_SIZE;
811 }
812 }
813
814 /* Fall through here if EOF encountered. This indicates some kind of error,
815 since a correct message is terminated by [CR] LF . [CR] LF. */
816
817 return END_EOF;
818 }
819
820
821
822
823 /*************************************************
824 * Swallow SMTP message *
825 *************************************************/
826
827 /* This function is called when there has been some kind of error while reading
828 an SMTP message, and the remaining data may need to be swallowed. It is global
829 because it is called from smtp_closedown() to shut down an incoming call
830 tidily.
831
832 Argument: a FILE from which to read the message
833 Returns: nothing
834 */
835
836 void
837 receive_swallow_smtp(void)
838 {
839 if (message_ended >= END_NOTENDED)
840 message_ended = read_message_data_smtp(NULL);
841 }
842
843
844
845 /*************************************************
846 * Handle lost SMTP connection *
847 *************************************************/
848
849 /* This function logs connection loss incidents and generates an appropriate
850 SMTP response.
851
852 Argument: additional data for the message
853 Returns: the SMTP response
854 */
855
856 static uschar *
857 handle_lost_connection(uschar *s)
858 {
859 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
860 "%s lost while reading message data%s", smtp_get_connection_info(), s);
861 return US"421 Lost incoming connection";
862 }
863
864
865
866
867 /*************************************************
868 * Handle a non-smtp reception error *
869 *************************************************/
870
871 /* This function is called for various errors during the reception of non-SMTP
872 messages. It either sends a message to the sender of the problem message, or it
873 writes to the standard error stream.
874
875 Arguments:
876 errcode code for moan_to_sender(), identifying the error
877 text1 first message text, passed to moan_to_sender()
878 text2 second message text, used only for stderrr
879 error_rc code to pass to exim_exit if no problem
880 f FILE containing body of message (may be stdin)
881 hptr pointer to instore headers or NULL
882
883 Returns: calls exim_exit(), which does not return
884 */
885
886 static void
887 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
888 FILE *f, header_line *hptr)
889 {
890 if (error_handling == ERRORS_SENDER)
891 {
892 error_block eblock;
893 eblock.next = NULL;
894 eblock.text1 = text1;
895 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
896 error_rc = EXIT_FAILURE;
897 }
898 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
899 (void)fclose(f);
900 exim_exit(error_rc);
901 }
902
903
904
905 /*************************************************
906 * Add header lines set up by ACL *
907 *************************************************/
908
909 /* This function is called to add the header lines that were set up by
910 statements in an ACL to the list of headers in memory. It is done in two stages
911 like this, because when the ACL for RCPT is running, the other headers have not
912 yet been received. This function is called twice; once just before running the
913 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
914 are visible to the DATA ACL.
915
916 Originally these header lines were added at the end. Now there is support for
917 three different places: top, bottom, and after the Received: header(s). There
918 will always be at least one Received: header, even if it is marked deleted, and
919 even if something else has been put in front of it.
920
921 Arguments:
922 acl_name text to identify which ACL
923
924 Returns: nothing
925 */
926
927 static void
928 add_acl_headers(uschar *acl_name)
929 {
930 header_line *h, *next;
931 header_line *last_received = NULL;
932
933 if (acl_added_headers == NULL) return;
934 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
935
936 for (h = acl_added_headers; h != NULL; h = next)
937 {
938 next = h->next;
939
940 switch(h->type)
941 {
942 case htype_add_top:
943 h->next = header_list;
944 header_list = h;
945 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
946 break;
947
948 case htype_add_rec:
949 if (last_received == NULL)
950 {
951 last_received = header_list;
952 while (!header_testname(last_received, US"Received", 8, FALSE))
953 last_received = last_received->next;
954 while (last_received->next != NULL &&
955 header_testname(last_received->next, US"Received", 8, FALSE))
956 last_received = last_received->next;
957 }
958 h->next = last_received->next;
959 last_received->next = h;
960 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
961 break;
962
963 case htype_add_rfc:
964 /* add header before any header which is NOT Received: or Resent- */
965 last_received = header_list;
966 while ( (last_received->next != NULL) &&
967 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
968 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
969 last_received = last_received->next;
970 /* last_received now points to the last Received: or Resent-* header
971 in an uninterrupted chain of those header types (seen from the beginning
972 of all headers. Our current header must follow it. */
973 h->next = last_received->next;
974 last_received->next = h;
975 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
976 break;
977
978 default:
979 h->next = NULL;
980 header_last->next = h;
981 break;
982 }
983
984 if (h->next == NULL) header_last = h;
985
986 /* Check for one of the known header types (From:, To:, etc.) though in
987 practice most added headers are going to be "other". Lower case
988 identification letters are never stored with the header; they are used
989 for existence tests when messages are received. So discard any lower case
990 flag values. */
991
992 h->type = header_checkname(h, FALSE);
993 if (h->type >= 'a') h->type = htype_other;
994
995 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
996 }
997
998 acl_added_headers = NULL;
999 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1000 }
1001
1002
1003
1004 /*************************************************
1005 * Add host information for log line *
1006 *************************************************/
1007
1008 /* Called for acceptance and rejecting log lines. This adds information about
1009 the calling host to a string that is being built dynamically.
1010
1011 Arguments:
1012 s the dynamic string
1013 sizeptr points to the size variable
1014 ptrptr points to the pointer variable
1015
1016 Returns: the extended string
1017 */
1018
1019 static uschar *
1020 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1021 {
1022 if (sender_fullhost != NULL)
1023 {
1024 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1025 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1026 interface_address != NULL)
1027 {
1028 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1029 interface_port);
1030 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1031 }
1032 }
1033 if (sender_ident != NULL)
1034 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1035 if (received_protocol != NULL)
1036 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1037 return s;
1038 }
1039
1040
1041
1042 #ifdef WITH_CONTENT_SCAN
1043
1044 /*************************************************
1045 * Run the MIME ACL on a message *
1046 *************************************************/
1047
1048 /* This code is in a subroutine so that it can be used for both SMTP
1049 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1050
1051 Arguments:
1052 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1053 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1054 smtp_reply_ptr Where SMTP reply is being built
1055 blackholed_by_ptr Where "blackholed by" message is being built
1056
1057 Returns: TRUE to carry on; FALSE to abandon the message
1058 */
1059
1060 static BOOL
1061 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1062 uschar **blackholed_by_ptr)
1063 {
1064 FILE *mbox_file;
1065 uschar rfc822_file_path[2048];
1066 unsigned long mbox_size;
1067 header_line *my_headerlist;
1068 uschar *user_msg, *log_msg;
1069 int mime_part_count_buffer = -1;
1070 int rc = OK;
1071
1072 memset(CS rfc822_file_path,0,2048);
1073
1074 /* check if it is a MIME message */
1075 my_headerlist = header_list;
1076 while (my_headerlist != NULL)
1077 {
1078 /* skip deleted headers */
1079 if (my_headerlist->type == '*')
1080 {
1081 my_headerlist = my_headerlist->next;
1082 continue;
1083 }
1084 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1085 {
1086 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1087 goto DO_MIME_ACL;
1088 }
1089 my_headerlist = my_headerlist->next;
1090 }
1091
1092 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1093 return TRUE;
1094
1095 DO_MIME_ACL:
1096 /* make sure the eml mbox file is spooled up */
1097 mbox_file = spool_mbox(&mbox_size, NULL);
1098 if (mbox_file == NULL) {
1099 /* error while spooling */
1100 log_write(0, LOG_MAIN|LOG_PANIC,
1101 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1102 Uunlink(spool_name);
1103 unspool_mbox();
1104 #ifdef EXPERIMENTAL_DCC
1105 dcc_ok = 0;
1106 #endif
1107 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1108 message_id[0] = 0; /* Indicate no message accepted */
1109 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1110 return FALSE; /* Indicate skip to end of receive function */
1111 };
1112
1113 mime_is_rfc822 = 0;
1114
1115 MIME_ACL_CHECK:
1116 mime_part_count = -1;
1117 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1118 (void)fclose(mbox_file);
1119
1120 if (Ustrlen(rfc822_file_path) > 0)
1121 {
1122 mime_part_count = mime_part_count_buffer;
1123
1124 if (unlink(CS rfc822_file_path) == -1)
1125 {
1126 log_write(0, LOG_PANIC,
1127 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1128 goto END_MIME_ACL;
1129 }
1130 }
1131
1132 /* check if we must check any message/rfc822 attachments */
1133 if (rc == OK)
1134 {
1135 uschar temp_path[1024];
1136 int n;
1137 struct dirent *entry;
1138 DIR *tempdir;
1139
1140 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1141 message_id);
1142
1143 tempdir = opendir(CS temp_path);
1144 n = 0;
1145 do
1146 {
1147 entry = readdir(tempdir);
1148 if (entry == NULL) break;
1149 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1150 {
1151 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1152 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1153 break;
1154 }
1155 } while (1);
1156 closedir(tempdir);
1157
1158 if (entry != NULL)
1159 {
1160 mbox_file = Ufopen(rfc822_file_path,"rb");
1161 if (mbox_file == NULL)
1162 {
1163 log_write(0, LOG_PANIC,
1164 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1165 unlink(CS rfc822_file_path);
1166 goto END_MIME_ACL;
1167 }
1168 /* set RFC822 expansion variable */
1169 mime_is_rfc822 = 1;
1170 mime_part_count_buffer = mime_part_count;
1171 goto MIME_ACL_CHECK;
1172 }
1173 }
1174
1175 END_MIME_ACL:
1176 add_acl_headers(US"MIME");
1177 if (rc == DISCARD)
1178 {
1179 recipients_count = 0;
1180 *blackholed_by_ptr = US"MIME ACL";
1181 }
1182 else if (rc != OK)
1183 {
1184 Uunlink(spool_name);
1185 unspool_mbox();
1186 #ifdef EXPERIMENTAL_DCC
1187 dcc_ok = 0;
1188 #endif
1189 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1190 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1191 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1192 message_id[0] = 0; /* Indicate no message accepted */
1193 return FALSE; /* Cause skip to end of receive function */
1194 }
1195
1196 return TRUE;
1197 }
1198
1199 #endif /* WITH_CONTENT_SCAN */
1200
1201
1202 /*************************************************
1203 * Receive message *
1204 *************************************************/
1205
1206 /* Receive a message on the given input, and put it into a pair of spool files.
1207 Either a non-null list of recipients, or the extract flag will be true, or
1208 both. The flag sender_local is true for locally generated messages. The flag
1209 submission_mode is true if an ACL has obeyed "control = submission". The flag
1210 suppress_local_fixups is true if an ACL has obeyed "control =
1211 suppress_local_fixups". The flag smtp_input is true if the message is to be
1212 handled using SMTP conventions about termination and lines starting with dots.
1213 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1214
1215 If a message was successfully read, message_id[0] will be non-zero.
1216
1217 The general actions of this function are:
1218
1219 . Read the headers of the message (if any) into a chain of store
1220 blocks.
1221
1222 . If there is a "sender:" header and the message is locally originated,
1223 throw it away, unless the caller is trusted, or unless
1224 active_local_sender_retain is set - which can only happen if
1225 active_local_from_check is false.
1226
1227 . If recipients are to be extracted from the message, build the
1228 recipients list from the headers, removing any that were on the
1229 original recipients list (unless extract_addresses_remove_arguments is
1230 false), and at the same time, remove any bcc header that may be present.
1231
1232 . Get the spool file for the data, sort out its unique name, open
1233 and lock it (but don't give it the name yet).
1234
1235 . Generate a "Message-Id" header if the message doesn't have one, for
1236 locally-originated messages.
1237
1238 . Generate a "Received" header.
1239
1240 . Ensure the recipients list is fully qualified and rewritten if necessary.
1241
1242 . If there are any rewriting rules, apply them to the sender address
1243 and also to the headers.
1244
1245 . If there is no from: header, generate one, for locally-generated messages
1246 and messages in "submission mode" only.
1247
1248 . If the sender is local, check that from: is correct, and if not, generate
1249 a Sender: header, unless message comes from a trusted caller, or this
1250 feature is disabled by active_local_from_check being false.
1251
1252 . If there is no "date" header, generate one, for locally-originated
1253 or submission mode messages only.
1254
1255 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1256 dot_ends mode, to the data file. Leave it open, to hold the lock.
1257
1258 . Write the envelope and the headers to a new file.
1259
1260 . Set the name for the header file; close it.
1261
1262 . Set the name for the data file; close it.
1263
1264 Because this function can potentially be called many times in a single
1265 SMTP connection, all store should be got by store_get(), so that it will be
1266 automatically retrieved after the message is accepted.
1267
1268 FUDGE: It seems that sites on the net send out messages with just LF
1269 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1270 we make the CRs optional in all cases.
1271
1272 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1273 new regime is now in place in which bare CRs in header lines are turned into LF
1274 followed by a space, so as not to terminate the header line.
1275
1276 February 2004: A bare LF in a header line in a message whose first line was
1277 terminated by CRLF is treated in the same way as a bare CR.
1278
1279 Arguments:
1280 extract_recip TRUE if recipients are to be extracted from the message's
1281 headers
1282
1283 Returns: TRUE there are more messages to be read (SMTP input)
1284 FALSE there are no more messages to be read (non-SMTP input
1285 or SMTP connection collapsed, or other failure)
1286
1287 When reading a message for filter testing, the returned value indicates
1288 whether the headers (which is all that is read) were terminated by '.' or
1289 not. */
1290
1291 BOOL
1292 receive_msg(BOOL extract_recip)
1293 {
1294 int i;
1295 int rc = FAIL;
1296 int msg_size = 0;
1297 int process_info_len = Ustrlen(process_info);
1298 int error_rc = (error_handling == ERRORS_SENDER)?
1299 errors_sender_rc : EXIT_FAILURE;
1300 int header_size = 256;
1301 int start, end, domain, size, sptr;
1302 int id_resolution;
1303 int had_zero = 0;
1304 int prevlines_length = 0;
1305
1306 register int ptr = 0;
1307
1308 BOOL contains_resent_headers = FALSE;
1309 BOOL extracted_ignored = FALSE;
1310 BOOL first_line_ended_crlf = TRUE_UNSET;
1311 BOOL smtp_yield = TRUE;
1312 BOOL yield = FALSE;
1313
1314 BOOL resents_exist = FALSE;
1315 uschar *resent_prefix = US"";
1316 uschar *blackholed_by = NULL;
1317 uschar *blackhole_log_msg = US"";
1318
1319 flock_t lock_data;
1320 error_block *bad_addresses = NULL;
1321
1322 uschar *frozen_by = NULL;
1323 uschar *queued_by = NULL;
1324
1325 uschar *errmsg, *s;
1326 struct stat statbuf;
1327
1328 /* Final message to give to SMTP caller, and messages from ACLs */
1329
1330 uschar *smtp_reply = NULL;
1331 uschar *user_msg, *log_msg;
1332
1333 /* Working header pointers */
1334
1335 header_line *h, *next;
1336
1337 /* Flags for noting the existence of certain headers (only one left) */
1338
1339 BOOL date_header_exists = FALSE;
1340
1341 /* Pointers to receive the addresses of headers whose contents we need. */
1342
1343 header_line *from_header = NULL;
1344 header_line *subject_header = NULL;
1345 header_line *msgid_header = NULL;
1346 header_line *received_header;
1347
1348 /* Variables for use when building the Received: header. */
1349
1350 uschar *received;
1351 uschar *timestamp;
1352 int tslen;
1353
1354 /* Release any open files that might have been cached while preparing to
1355 accept the message - e.g. by verifying addresses - because reading a message
1356 might take a fair bit of real time. */
1357
1358 search_tidyup();
1359
1360 /* Initialize the chain of headers by setting up a place-holder for Received:
1361 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1362 pointing to the end of the chain to make adding headers simple. */
1363
1364 received_header = header_list = header_last = store_get(sizeof(header_line));
1365 header_list->next = NULL;
1366 header_list->type = htype_old;
1367 header_list->text = NULL;
1368 header_list->slen = 0;
1369
1370 /* Control block for the next header to be read. */
1371
1372 next = store_get(sizeof(header_line));
1373 next->text = store_get(header_size);
1374
1375 /* Initialize message id to be null (indicating no message read), and the
1376 header names list to be the normal list. Indicate there is no data file open
1377 yet, initialize the size and warning count, and deal with no size limit. */
1378
1379 message_id[0] = 0;
1380 data_file = NULL;
1381 data_fd = -1;
1382 spool_name[0] = 0;
1383 message_size = 0;
1384 warning_count = 0;
1385 received_count = 1; /* For the one we will add */
1386
1387 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1388
1389 /* While reading the message, the following counts are computed. */
1390
1391 message_linecount = body_linecount = body_zerocount =
1392 max_received_linelength = 0;
1393
1394 #ifndef DISABLE_DKIM
1395 /* Call into DKIM to set up the context. */
1396 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1397 #endif
1398
1399 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1400 ids, and fractions of a second are required. See the comments that precede the
1401 message id creation below. */
1402
1403 (void)gettimeofday(&message_id_tv, NULL);
1404
1405 /* For other uses of the received time we can operate with granularity of one
1406 second, and for that we use the global variable received_time. This is for
1407 things like ultimate message timeouts. */
1408
1409 received_time = message_id_tv.tv_sec;
1410
1411 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1412 happen in the smtp_getc() function when it refills its buffer. */
1413
1414 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1415
1416 /* If not SMTP input, timeout happens only if configured, and we just set a
1417 single timeout for the whole message. */
1418
1419 else if (receive_timeout > 0)
1420 {
1421 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1422 alarm(receive_timeout);
1423 }
1424
1425 /* SIGTERM and SIGINT are caught always. */
1426
1427 signal(SIGTERM, data_sigterm_sigint_handler);
1428 signal(SIGINT, data_sigterm_sigint_handler);
1429
1430 /* Header lines in messages are not supposed to be very long, though when
1431 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1432 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1433 storing the header, and extend this as necessary using string_cat().
1434
1435 To cope with total lunacies, impose an upper limit on the length of the header
1436 section of the message, as otherwise the store will fill up. We must also cope
1437 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1438 Folded header lines are joined into one string, leaving the '\n' characters
1439 inside them, so that writing them out reproduces the input.
1440
1441 Loop for each character of each header; the next structure for chaining the
1442 header is set up already, with ptr the offset of the next character in
1443 next->text. */
1444
1445 for (;;)
1446 {
1447 int ch = (receive_getc)();
1448
1449 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1450 SMTP must have a correct "." terminator. */
1451
1452 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1453 {
1454 smtp_reply = handle_lost_connection(US" (header)");
1455 smtp_yield = FALSE;
1456 goto TIDYUP; /* Skip to end of function */
1457 }
1458
1459 /* See if we are at the current header's size limit - there must be at least
1460 four bytes left. This allows for the new character plus a zero, plus two for
1461 extra insertions when we are playing games with dots and carriage returns. If
1462 we are at the limit, extend the text buffer. This could have been done
1463 automatically using string_cat() but because this is a tightish loop storing
1464 only one character at a time, we choose to do it inline. Normally
1465 store_extend() will be able to extend the block; only at the end of a big
1466 store block will a copy be needed. To handle the case of very long headers
1467 (and sometimes lunatic messages can have ones that are 100s of K long) we
1468 call store_release() for strings that have been copied - if the string is at
1469 the start of a block (and therefore the only thing in it, because we aren't
1470 doing any other gets), the block gets freed. We can only do this because we
1471 know there are no other calls to store_get() going on. */
1472
1473 if (ptr >= header_size - 4)
1474 {
1475 int oldsize = header_size;
1476 /* header_size += 256; */
1477 header_size *= 2;
1478 if (!store_extend(next->text, oldsize, header_size))
1479 {
1480 uschar *newtext = store_get(header_size);
1481 memcpy(newtext, next->text, ptr);
1482 store_release(next->text);
1483 next->text = newtext;
1484 }
1485 }
1486
1487 /* Cope with receiving a binary zero. There is dispute about whether
1488 these should be allowed in RFC 822 messages. The middle view is that they
1489 should not be allowed in headers, at least. Exim takes this attitude at
1490 the moment. We can't just stomp on them here, because we don't know that
1491 this line is a header yet. Set a flag to cause scanning later. */
1492
1493 if (ch == 0) had_zero++;
1494
1495 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1496 those from data files use just LF. Treat LF in local SMTP input as a
1497 terminator too. Treat EOF as a line terminator always. */
1498
1499 if (ch == EOF) goto EOL;
1500
1501 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1502 other MTAs accept this. We are therefore forced into this "liberalisation"
1503 too, so we accept LF as a line terminator whatever the source of the message.
1504 However, if the first line of the message ended with a CRLF, we treat a bare
1505 LF specially by inserting a white space after it to ensure that the header
1506 line is not terminated. */
1507
1508 if (ch == '\n')
1509 {
1510 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1511 else if (first_line_ended_crlf) receive_ungetc(' ');
1512 goto EOL;
1513 }
1514
1515 /* This is not the end of the line. If this is SMTP input and this is
1516 the first character in the line and it is a "." character, ignore it.
1517 This implements the dot-doubling rule, though header lines starting with
1518 dots aren't exactly common. They are legal in RFC 822, though. If the
1519 following is CRLF or LF, this is the line that that terminates the
1520 entire message. We set message_ended to indicate this has happened (to
1521 prevent further reading), and break out of the loop, having freed the
1522 empty header, and set next = NULL to indicate no data line. */
1523
1524 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1525 {
1526 ch = (receive_getc)();
1527 if (ch == '\r')
1528 {
1529 ch = (receive_getc)();
1530 if (ch != '\n')
1531 {
1532 receive_ungetc(ch);
1533 ch = '\r'; /* Revert to CR */
1534 }
1535 }
1536 if (ch == '\n')
1537 {
1538 message_ended = END_DOT;
1539 store_reset(next);
1540 next = NULL;
1541 break; /* End character-reading loop */
1542 }
1543
1544 /* For non-SMTP input, the dot at the start of the line was really a data
1545 character. What is now in ch is the following character. We guaranteed
1546 enough space for this above. */
1547
1548 if (!smtp_input)
1549 {
1550 next->text[ptr++] = '.';
1551 message_size++;
1552 }
1553 }
1554
1555 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1556 remember this case if this is the first line ending. */
1557
1558 if (ch == '\r')
1559 {
1560 ch = (receive_getc)();
1561 if (ch == '\n')
1562 {
1563 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1564 goto EOL;
1565 }
1566
1567 /* Otherwise, put back the character after CR, and turn the bare CR
1568 into LF SP. */
1569
1570 ch = (receive_ungetc)(ch);
1571 next->text[ptr++] = '\n';
1572 message_size++;
1573 ch = ' ';
1574 }
1575
1576 /* We have a data character for the header line. */
1577
1578 next->text[ptr++] = ch; /* Add to buffer */
1579 message_size++; /* Total message size so far */
1580
1581 /* Handle failure due to a humungously long header section. The >= allows
1582 for the terminating \n. Add what we have so far onto the headers list so
1583 that it gets reflected in any error message, and back up the just-read
1584 character. */
1585
1586 if (message_size >= header_maxsize)
1587 {
1588 next->text[ptr] = 0;
1589 next->slen = ptr;
1590 next->type = htype_other;
1591 next->next = NULL;
1592 header_last->next = next;
1593 header_last = next;
1594
1595 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1596 "%s (more than %d characters): message abandoned",
1597 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1598
1599 if (smtp_input)
1600 {
1601 smtp_reply = US"552 Message header is ridiculously long";
1602 receive_swallow_smtp();
1603 goto TIDYUP; /* Skip to end of function */
1604 }
1605
1606 else
1607 {
1608 give_local_error(ERRMESS_VLONGHEADER,
1609 string_sprintf("message header longer than %d characters received: "
1610 "message not accepted", header_maxsize), US"", error_rc, stdin,
1611 header_list->next);
1612 /* Does not return */
1613 }
1614 }
1615
1616 continue; /* With next input character */
1617
1618 /* End of header line reached */
1619
1620 EOL:
1621
1622 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1623
1624 receive_linecount++;
1625 message_linecount++;
1626
1627 /* Keep track of maximum line length */
1628
1629 if (ptr - prevlines_length > max_received_linelength)
1630 max_received_linelength = ptr - prevlines_length;
1631 prevlines_length = ptr + 1;
1632
1633 /* Now put in the terminating newline. There is always space for
1634 at least two more characters. */
1635
1636 next->text[ptr++] = '\n';
1637 message_size++;
1638
1639 /* A blank line signals the end of the headers; release the unwanted
1640 space and set next to NULL to indicate this. */
1641
1642 if (ptr == 1)
1643 {
1644 store_reset(next);
1645 next = NULL;
1646 break;
1647 }
1648
1649 /* There is data in the line; see if the next input character is a
1650 whitespace character. If it is, we have a continuation of this header line.
1651 There is always space for at least one character at this point. */
1652
1653 if (ch != EOF)
1654 {
1655 int nextch = (receive_getc)();
1656 if (nextch == ' ' || nextch == '\t')
1657 {
1658 next->text[ptr++] = nextch;
1659 message_size++;
1660 continue; /* Iterate the loop */
1661 }
1662 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1663 else ch = EOF; /* Cause main loop to exit at end */
1664 }
1665
1666 /* We have got to the real line end. Terminate the string and release store
1667 beyond it. If it turns out to be a real header, internal binary zeros will
1668 be squashed later. */
1669
1670 next->text[ptr] = 0;
1671 next->slen = ptr;
1672 store_reset(next->text + ptr + 1);
1673
1674 /* Check the running total size against the overall message size limit. We
1675 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1676 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1677 headers - the code to read the body will then also hit the buffer. */
1678
1679 if (message_size > thismessage_size_limit) break;
1680
1681 /* A line that is not syntactically correct for a header also marks
1682 the end of the headers. In this case, we leave next containing the
1683 first data line. This might actually be several lines because of the
1684 continuation logic applied above, but that doesn't matter.
1685
1686 It turns out that smail, and presumably sendmail, accept leading lines
1687 of the form
1688
1689 From ph10 Fri Jan 5 12:35 GMT 1996
1690
1691 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1692 find any documentation of this, but for compatibility it had better be
1693 accepted. Exim restricts it to the case of non-smtp messages, and
1694 treats it as an alternative to the -f command line option. Thus it is
1695 ignored except for trusted users or filter testing. Otherwise it is taken
1696 as the sender address, unless -f was used (sendmail compatibility).
1697
1698 It further turns out that some UUCPs generate the From_line in a different
1699 format, e.g.
1700
1701 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1702
1703 The regex for matching these things is now capable of recognizing both
1704 formats (including 2- and 4-digit years in the latter). In fact, the regex
1705 is now configurable, as is the expansion string to fish out the sender.
1706
1707 Even further on it has been discovered that some broken clients send
1708 these lines in SMTP messages. There is now an option to ignore them from
1709 specified hosts or networks. Sigh. */
1710
1711 if (header_last == header_list &&
1712 (!smtp_input
1713 ||
1714 (sender_host_address != NULL &&
1715 verify_check_host(&ignore_fromline_hosts) == OK)
1716 ||
1717 (sender_host_address == NULL && ignore_fromline_local)
1718 ) &&
1719 regex_match_and_setup(regex_From, next->text, 0, -1))
1720 {
1721 if (!sender_address_forced)
1722 {
1723 uschar *uucp_sender = expand_string(uucp_from_sender);
1724 if (uucp_sender == NULL)
1725 {
1726 log_write(0, LOG_MAIN|LOG_PANIC,
1727 "expansion of \"%s\" failed after matching "
1728 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1729 }
1730 else
1731 {
1732 int start, end, domain;
1733 uschar *errmess;
1734 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1735 &start, &end, &domain, TRUE);
1736 if (newsender != NULL)
1737 {
1738 if (domain == 0 && newsender[0] != 0)
1739 newsender = rewrite_address_qualify(newsender, FALSE);
1740
1741 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1742 {
1743 sender_address = newsender;
1744
1745 if (trusted_caller || filter_test != FTEST_NONE)
1746 {
1747 authenticated_sender = NULL;
1748 originator_name = US"";
1749 sender_local = FALSE;
1750 }
1751
1752 if (filter_test != FTEST_NONE)
1753 printf("Sender taken from \"From \" line\n");
1754 }
1755 }
1756 }
1757 }
1758 }
1759
1760 /* Not a leading "From " line. Check to see if it is a valid header line.
1761 Header names may contain any non-control characters except space and colon,
1762 amazingly. */
1763
1764 else
1765 {
1766 uschar *p = next->text;
1767
1768 /* If not a valid header line, break from the header reading loop, leaving
1769 next != NULL, indicating that it holds the first line of the body. */
1770
1771 if (isspace(*p)) break;
1772 while (mac_isgraph(*p) && *p != ':') p++;
1773 while (isspace(*p)) p++;
1774 if (*p != ':')
1775 {
1776 body_zerocount = had_zero;
1777 break;
1778 }
1779
1780 /* We have a valid header line. If there were any binary zeroes in
1781 the line, stomp on them here. */
1782
1783 if (had_zero > 0)
1784 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1785
1786 /* It is perfectly legal to have an empty continuation line
1787 at the end of a header, but it is confusing to humans
1788 looking at such messages, since it looks like a blank line.
1789 Reduce confusion by removing redundant white space at the
1790 end. We know that there is at least one printing character
1791 (the ':' tested for above) so there is no danger of running
1792 off the end. */
1793
1794 p = next->text + ptr - 2;
1795 for (;;)
1796 {
1797 while (*p == ' ' || *p == '\t') p--;
1798 if (*p != '\n') break;
1799 ptr = (p--) - next->text + 1;
1800 message_size -= next->slen - ptr;
1801 next->text[ptr] = 0;
1802 next->slen = ptr;
1803 }
1804
1805 /* Add the header to the chain */
1806
1807 next->type = htype_other;
1808 next->next = NULL;
1809 header_last->next = next;
1810 header_last = next;
1811
1812 /* Check the limit for individual line lengths. This comes after adding to
1813 the chain so that the failing line is reflected if a bounce is generated
1814 (for a local message). */
1815
1816 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1817 {
1818 log_write(0, LOG_MAIN, "overlong message header line received from "
1819 "%s (more than %d characters): message abandoned",
1820 sender_host_unknown? sender_ident : sender_fullhost,
1821 header_line_maxsize);
1822
1823 if (smtp_input)
1824 {
1825 smtp_reply = US"552 A message header line is too long";
1826 receive_swallow_smtp();
1827 goto TIDYUP; /* Skip to end of function */
1828 }
1829
1830 else
1831 {
1832 give_local_error(ERRMESS_VLONGHDRLINE,
1833 string_sprintf("message header line longer than %d characters "
1834 "received: message not accepted", header_line_maxsize), US"",
1835 error_rc, stdin, header_list->next);
1836 /* Does not return */
1837 }
1838 }
1839
1840 /* Note if any resent- fields exist. */
1841
1842 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1843 {
1844 resents_exist = TRUE;
1845 resent_prefix = US"Resent-";
1846 }
1847 }
1848
1849 /* The line has been handled. If we have hit EOF, break out of the loop,
1850 indicating no pending data line. */
1851
1852 if (ch == EOF) { next = NULL; break; }
1853
1854 /* Set up for the next header */
1855
1856 header_size = 256;
1857 next = store_get(sizeof(header_line));
1858 next->text = store_get(header_size);
1859 ptr = 0;
1860 had_zero = 0;
1861 prevlines_length = 0;
1862 } /* Continue, starting to read the next header */
1863
1864 /* At this point, we have read all the headers into a data structure in main
1865 store. The first header is still the dummy placeholder for the Received: header
1866 we are going to generate a bit later on. If next != NULL, it contains the first
1867 data line - which terminated the headers before reaching a blank line (not the
1868 normal case). */
1869
1870 DEBUG(D_receive)
1871 {
1872 debug_printf(">>Headers received:\n");
1873 for (h = header_list->next; h != NULL; h = h->next)
1874 debug_printf("%s", h->text);
1875 debug_printf("\n");
1876 }
1877
1878 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1879 is dropped immediately after valid headers, the next thing we will see is EOF.
1880 We must test for this specially, as further down the reading of the data is
1881 skipped if already at EOF. */
1882
1883 if (smtp_input && (receive_feof)())
1884 {
1885 smtp_reply = handle_lost_connection(US" (after header)");
1886 smtp_yield = FALSE;
1887 goto TIDYUP; /* Skip to end of function */
1888 }
1889
1890 /* If this is a filter test run and no headers were read, output a warning
1891 in case there is a mistake in the test message. */
1892
1893 if (filter_test != FTEST_NONE && header_list->next == NULL)
1894 printf("Warning: no message headers read\n");
1895
1896
1897 /* Scan the headers to identify them. Some are merely marked for later
1898 processing; some are dealt with here. */
1899
1900 for (h = header_list->next; h != NULL; h = h->next)
1901 {
1902 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1903 if (is_resent) contains_resent_headers = TRUE;
1904
1905 switch (header_checkname(h, is_resent))
1906 {
1907 case htype_bcc:
1908 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
1909 break;
1910
1911 case htype_cc:
1912 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
1913 break;
1914
1915 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1916
1917 case htype_date:
1918 if (!resents_exist || is_resent) date_header_exists = TRUE;
1919 break;
1920
1921 /* Same comments as about Return-Path: below. */
1922
1923 case htype_delivery_date:
1924 if (delivery_date_remove) h->type = htype_old;
1925 break;
1926
1927 /* Same comments as about Return-Path: below. */
1928
1929 case htype_envelope_to:
1930 if (envelope_to_remove) h->type = htype_old;
1931 break;
1932
1933 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1934 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1935 header consists of just the login id of the user who called Exim, rewrite
1936 it with the gecos field first. Apply this rule to Resent-From: if there
1937 are resent- fields. */
1938
1939 case htype_from:
1940 h->type = htype_from;
1941 if (!resents_exist || is_resent)
1942 {
1943 from_header = h;
1944 if (!smtp_input)
1945 {
1946 uschar *s = Ustrchr(h->text, ':') + 1;
1947 while (isspace(*s)) s++;
1948 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1949 {
1950 uschar *name = is_resent? US"Resent-From" : US"From";
1951 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1952 originator_login, qualify_domain_sender);
1953 from_header = header_last;
1954 h->type = htype_old;
1955 DEBUG(D_receive|D_rewrite)
1956 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1957 }
1958 }
1959 }
1960 break;
1961
1962 /* Identify the Message-id: header for generating "in-reply-to" in the
1963 autoreply transport. For incoming logging, save any resent- value. In both
1964 cases, take just the first of any multiples. */
1965
1966 case htype_id:
1967 if (msgid_header == NULL && (!resents_exist || is_resent))
1968 {
1969 msgid_header = h;
1970 h->type = htype_id;
1971 }
1972 break;
1973
1974 /* Flag all Received: headers */
1975
1976 case htype_received:
1977 h->type = htype_received;
1978 received_count++;
1979 break;
1980
1981 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1982
1983 case htype_reply_to:
1984 h->type = htype_reply_to;
1985 break;
1986
1987 /* The Return-path: header is supposed to be added to messages when
1988 they leave the SMTP system. We shouldn't receive messages that already
1989 contain Return-path. However, since Exim generates Return-path: on
1990 local delivery, resent messages may well contain it. We therefore
1991 provide an option (which defaults on) to remove any Return-path: headers
1992 on input. Removal actually means flagging as "old", which prevents the
1993 header being transmitted with the message. */
1994
1995 case htype_return_path:
1996 if (return_path_remove) h->type = htype_old;
1997
1998 /* If we are testing a mail filter file, use the value of the
1999 Return-Path: header to set up the return_path variable, which is not
2000 otherwise set. However, remove any <> that surround the address
2001 because the variable doesn't have these. */
2002
2003 if (filter_test != FTEST_NONE)
2004 {
2005 uschar *start = h->text + 12;
2006 uschar *end = start + Ustrlen(start);
2007 while (isspace(*start)) start++;
2008 while (end > start && isspace(end[-1])) end--;
2009 if (*start == '<' && end[-1] == '>')
2010 {
2011 start++;
2012 end--;
2013 }
2014 return_path = string_copyn(start, end - start);
2015 printf("Return-path taken from \"Return-path:\" header line\n");
2016 }
2017 break;
2018
2019 /* If there is a "Sender:" header and the message is locally originated,
2020 and from an untrusted caller and suppress_local_fixups is not set, or if we
2021 are in submission mode for a remote message, mark it "old" so that it will
2022 not be transmitted with the message, unless active_local_sender_retain is
2023 set. (This can only be true if active_local_from_check is false.) If there
2024 are any resent- headers in the message, apply this rule to Resent-Sender:
2025 instead of Sender:. Messages with multiple resent- header sets cannot be
2026 tidily handled. (For this reason, at least one MUA - Pine - turns old
2027 resent- headers into X-resent- headers when resending, leaving just one
2028 set.) */
2029
2030 case htype_sender:
2031 h->type = ((!active_local_sender_retain &&
2032 (
2033 (sender_local && !trusted_caller && !suppress_local_fixups)
2034 || submission_mode
2035 )
2036 ) &&
2037 (!resents_exist||is_resent))?
2038 htype_old : htype_sender;
2039 break;
2040
2041 /* Remember the Subject: header for logging. There is no Resent-Subject */
2042
2043 case htype_subject:
2044 subject_header = h;
2045 break;
2046
2047 /* "To:" gets flagged, and the existence of a recipient header is noted,
2048 whether it's resent- or not. */
2049
2050 case htype_to:
2051 h->type = htype_to;
2052 /****
2053 to_or_cc_header_exists = TRUE;
2054 ****/
2055 break;
2056 }
2057 }
2058
2059 /* Extract recipients from the headers if that is required (the -t option).
2060 Note that this is documented as being done *before* any address rewriting takes
2061 place. There are two possibilities:
2062
2063 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2064 recipients already listed are to be REMOVED from the message. Smail 3 works
2065 like this. We need to build a non-recipients tree for that list, because in
2066 subsequent processing this data is held in a tree and that's what the
2067 spool_write_header() function expects. Make sure that non-recipient addresses
2068 are fully qualified and rewritten if necessary.
2069
2070 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2071 those in the command line arguments (and it is rumoured some other MTAs do
2072 this). Therefore, there is an option to make Exim behave this way.
2073
2074 *** Notes on "Resent-" header lines ***
2075
2076 The presence of resent-headers in the message makes -t horribly ambiguous.
2077 Experiments with sendmail showed that it uses recipients for all resent-
2078 headers, totally ignoring the concept of "sets of resent- headers" as described
2079 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2080 with all the addresses in one instance of each header.
2081
2082 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2083 error for -t if there were resent- headers in the message. However, after a
2084 discussion on the mailing list, I've learned that there are MUAs that use
2085 resent- headers with -t, and also that the stuff about sets of resent- headers
2086 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2087 message with -t and resent- header lines makes sure that only *its* resent-
2088 headers are present; previous ones are often renamed as X-resent- for example.
2089
2090 Consequently, Exim has been changed so that, if any resent- header lines are
2091 present, the recipients are taken from all of the appropriate resent- lines,
2092 and not from the ordinary To:, Cc:, etc. */
2093
2094 if (extract_recip)
2095 {
2096 int rcount = 0;
2097 error_block **bnext = &bad_addresses;
2098
2099 if (extract_addresses_remove_arguments)
2100 {
2101 while (recipients_count-- > 0)
2102 {
2103 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2104 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2105 tree_add_nonrecipient(s);
2106 }
2107 recipients_list = NULL;
2108 recipients_count = recipients_list_max = 0;
2109 }
2110
2111 /* Now scan the headers */
2112
2113 for (h = header_list->next; h != NULL; h = h->next)
2114 {
2115 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2116 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2117 {
2118 uschar *s = Ustrchr(h->text, ':') + 1;
2119 while (isspace(*s)) s++;
2120
2121 parse_allow_group = TRUE; /* Allow address group syntax */
2122
2123 while (*s != 0)
2124 {
2125 uschar *ss = parse_find_address_end(s, FALSE);
2126 uschar *recipient, *errmess, *p, *pp;
2127 int start, end, domain;
2128
2129 /* Check on maximum */
2130
2131 if (recipients_max > 0 && ++rcount > recipients_max)
2132 {
2133 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2134 US"message rejected: ", error_rc, stdin, NULL);
2135 /* Does not return */
2136 }
2137
2138 /* Make a copy of the address, and remove any internal newlines. These
2139 may be present as a result of continuations of the header line. The
2140 white space that follows the newline must not be removed - it is part
2141 of the header. */
2142
2143 pp = recipient = store_get(ss - s + 1);
2144 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2145 *pp = 0;
2146 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2147 &domain, FALSE);
2148
2149 /* Keep a list of all the bad addresses so we can send a single
2150 error message at the end. However, an empty address is not an error;
2151 just ignore it. This can come from an empty group list like
2152
2153 To: Recipients of list:;
2154
2155 If there are no recipients at all, an error will occur later. */
2156
2157 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2158 {
2159 int len = Ustrlen(s);
2160 error_block *b = store_get(sizeof(error_block));
2161 while (len > 0 && isspace(s[len-1])) len--;
2162 b->next = NULL;
2163 b->text1 = string_printing(string_copyn(s, len));
2164 b->text2 = errmess;
2165 *bnext = b;
2166 bnext = &(b->next);
2167 }
2168
2169 /* If the recipient is already in the nonrecipients tree, it must
2170 have appeared on the command line with the option extract_addresses_
2171 remove_arguments set. Do not add it to the recipients, and keep a note
2172 that this has happened, in order to give a better error if there are
2173 no recipients left. */
2174
2175 else if (recipient != NULL)
2176 {
2177 if (tree_search(tree_nonrecipients, recipient) == NULL)
2178 receive_add_recipient(recipient, -1);
2179 else
2180 extracted_ignored = TRUE;
2181 }
2182
2183 /* Move on past this address */
2184
2185 s = ss + (*ss? 1:0);
2186 while (isspace(*s)) s++;
2187 } /* Next address */
2188
2189 parse_allow_group = FALSE; /* Reset group syntax flags */
2190 parse_found_group = FALSE;
2191
2192 /* If this was the bcc: header, mark it "old", which means it
2193 will be kept on the spool, but not transmitted as part of the
2194 message. */
2195
2196 if (h->type == htype_bcc) h->type = htype_old;
2197 } /* For appropriate header line */
2198 } /* For each header line */
2199
2200 }
2201
2202 /* Now build the unique message id. This has changed several times over the
2203 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2204 Retaining all the history in the comment has become too unwieldy - read
2205 previous release sources if you want it.
2206
2207 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2208 The first part is the current time, in seconds. The second part is the current
2209 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2210 can hold a number in the range 0-3843. It used to be a computed sequence
2211 number, but is now the fractional component of the current time in units of
2212 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2213 received, Exim ensures that the timer has ticked at the appropriate level
2214 before proceeding, to avoid duplication if the pid happened to be re-used
2215 within the same time period. It seems likely that most messages will take at
2216 least half a millisecond to be received, so no delay will normally be
2217 necessary. At least for some time...
2218
2219 There is a modification when localhost_number is set. Formerly this was allowed
2220 to be as large as 255. Now it is restricted to the range 0-16, and the final
2221 component of the message id becomes (localhost_number * 200) + fractional time
2222 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2223
2224 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2225 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2226 still allows the tttttt field to hold a large enough number to last for some
2227 more decades, and the final two-digit field can hold numbers up to 1295, which
2228 is enough for milliseconds (instead of 1/2000 of a second).
2229
2230 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2231 pid, so it is probably safe because pids have to be positive. The
2232 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2233 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2234
2235 Note that string_base62() returns its data in a static storage block, so it
2236 must be copied before calling string_base62() again. It always returns exactly
2237 6 characters.
2238
2239 There doesn't seem to be anything in the RFC which requires a message id to
2240 start with a letter, but Smail was changed to ensure this. The external form of
2241 the message id (as supplied by string expansion) therefore starts with an
2242 additional leading 'E'. The spool file names do not include this leading
2243 letter and it is not used internally.
2244
2245 NOTE: If ever the format of message ids is changed, the regular expression for
2246 checking that a string is in this format must be updated in a corresponding
2247 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2248 must also be changed to reflect the correct string length. Then, of course,
2249 other programs that rely on the message id format will need updating too. */
2250
2251 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2252 message_id[6] = '-';
2253 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2254
2255 /* Deal with the case where the host number is set. The value of the number was
2256 checked when it was read, to ensure it isn't too big. The timing granularity is
2257 left in id_resolution so that an appropriate wait can be done after receiving
2258 the message, if necessary (we hope it won't be). */
2259
2260 if (host_number_string != NULL)
2261 {
2262 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2263 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2264 string_base62((long int)(
2265 host_number * (1000000/id_resolution) +
2266 message_id_tv.tv_usec/id_resolution)) + 4);
2267 }
2268
2269 /* Host number not set: final field is just the fractional time at an
2270 appropriate resolution. */
2271
2272 else
2273 {
2274 id_resolution = (BASE_62 == 62)? 500 : 1000;
2275 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2276 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2277 }
2278
2279 /* Add the current message id onto the current process info string if
2280 it will fit. */
2281
2282 (void)string_format(process_info + process_info_len,
2283 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2284
2285 /* If we are using multiple input directories, set up the one for this message
2286 to be the least significant base-62 digit of the time of arrival. Otherwise
2287 ensure that it is an empty string. */
2288
2289 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2290
2291 /* Now that we have the message-id, if there is no message-id: header, generate
2292 one, but only for local (without suppress_local_fixups) or submission mode
2293 messages. This can be user-configured if required, but we had better flatten
2294 any illegal characters therein. */
2295
2296 if (msgid_header == NULL &&
2297 ((sender_host_address == NULL && !suppress_local_fixups)
2298 || submission_mode))
2299 {
2300 uschar *p;
2301 uschar *id_text = US"";
2302 uschar *id_domain = primary_hostname;
2303
2304 /* Permit only letters, digits, dots, and hyphens in the domain */
2305
2306 if (message_id_domain != NULL)
2307 {
2308 uschar *new_id_domain = expand_string(message_id_domain);
2309 if (new_id_domain == NULL)
2310 {
2311 if (!expand_string_forcedfail)
2312 log_write(0, LOG_MAIN|LOG_PANIC,
2313 "expansion of \"%s\" (message_id_header_domain) "
2314 "failed: %s", message_id_domain, expand_string_message);
2315 }
2316 else if (*new_id_domain != 0)
2317 {
2318 id_domain = new_id_domain;
2319 for (p = id_domain; *p != 0; p++)
2320 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2321 }
2322 }
2323
2324 /* Permit all characters except controls and RFC 2822 specials in the
2325 additional text part. */
2326
2327 if (message_id_text != NULL)
2328 {
2329 uschar *new_id_text = expand_string(message_id_text);
2330 if (new_id_text == NULL)
2331 {
2332 if (!expand_string_forcedfail)
2333 log_write(0, LOG_MAIN|LOG_PANIC,
2334 "expansion of \"%s\" (message_id_header_text) "
2335 "failed: %s", message_id_text, expand_string_message);
2336 }
2337 else if (*new_id_text != 0)
2338 {
2339 id_text = new_id_text;
2340 for (p = id_text; *p != 0; p++)
2341 if (mac_iscntrl_or_special(*p)) *p = '-';
2342 }
2343 }
2344
2345 /* Add the header line
2346 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2347 * appended, to preserve classical expectations of header ordering. */
2348
2349 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2350 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2351 (*id_text == 0)? "" : ".", id_text, id_domain);
2352 }
2353
2354 /* If we are to log recipients, keep a copy of the raw ones before any possible
2355 rewriting. Must copy the count, because later ACLs and the local_scan()
2356 function may mess with the real recipients. */
2357
2358 if ((log_extra_selector & LX_received_recipients) != 0)
2359 {
2360 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2361 for (i = 0; i < recipients_count; i++)
2362 raw_recipients[i] = string_copy(recipients_list[i].address);
2363 raw_recipients_count = recipients_count;
2364 }
2365
2366 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2367 recipients will get here only if the conditions were right (allow_unqualified_
2368 recipient is TRUE). */
2369
2370 for (i = 0; i < recipients_count; i++)
2371 recipients_list[i].address =
2372 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2373 global_rewrite_rules, rewrite_existflags);
2374
2375 /* If there is no From: header, generate one for local (without
2376 suppress_local_fixups) or submission_mode messages. If there is no sender
2377 address, but the sender is local or this is a local delivery error, use the
2378 originator login. This shouldn't happen for genuine bounces, but might happen
2379 for autoreplies. The addition of From: must be done *before* checking for the
2380 possible addition of a Sender: header, because untrusted_set_sender allows an
2381 untrusted user to set anything in the envelope (which might then get info
2382 From:) but we still want to ensure a valid Sender: if it is required. */
2383
2384 if (from_header == NULL &&
2385 ((sender_host_address == NULL && !suppress_local_fixups)
2386 || submission_mode))
2387 {
2388 uschar *oname = US"";
2389
2390 /* Use the originator_name if this is a locally submitted message and the
2391 caller is not trusted. For trusted callers, use it only if -F was used to
2392 force its value or if we have a non-SMTP message for which -f was not used
2393 to set the sender. */
2394
2395 if (sender_host_address == NULL)
2396 {
2397 if (!trusted_caller || sender_name_forced ||
2398 (!smtp_input && !sender_address_forced))
2399 oname = originator_name;
2400 }
2401
2402 /* For non-locally submitted messages, the only time we use the originator
2403 name is when it was forced by the /name= option on control=submission. */
2404
2405 else
2406 {
2407 if (submission_name != NULL) oname = submission_name;
2408 }
2409
2410 /* Envelope sender is empty */
2411
2412 if (sender_address[0] == 0)
2413 {
2414 uschar *fromstart, *fromend;
2415
2416 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2417 oname, (oname[0] == 0)? "" : " <");
2418 fromend = (oname[0] == 0)? US"" : US">";
2419
2420 if (sender_local || local_error_message)
2421 {
2422 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2423 local_part_quote(originator_login), qualify_domain_sender,
2424 fromend);
2425 }
2426 else if (submission_mode && authenticated_id != NULL)
2427 {
2428 if (submission_domain == NULL)
2429 {
2430 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2431 local_part_quote(authenticated_id), qualify_domain_sender,
2432 fromend);
2433 }
2434 else if (submission_domain[0] == 0) /* empty => whole address set */
2435 {
2436 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2437 fromend);
2438 }
2439 else
2440 {
2441 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2442 local_part_quote(authenticated_id), submission_domain,
2443 fromend);
2444 }
2445 from_header = header_last; /* To get it checked for Sender: */
2446 }
2447 }
2448
2449 /* There is a non-null envelope sender. Build the header using the original
2450 sender address, before any rewriting that might have been done while
2451 verifying it. */
2452
2453 else
2454 {
2455 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2456 oname,
2457 (oname[0] == 0)? "" : " <",
2458 (sender_address_unrewritten == NULL)?
2459 sender_address : sender_address_unrewritten,
2460 (oname[0] == 0)? "" : ">");
2461
2462 from_header = header_last; /* To get it checked for Sender: */
2463 }
2464 }
2465
2466
2467 /* If the sender is local (without suppress_local_fixups), or if we are in
2468 submission mode and there is an authenticated_id, check that an existing From:
2469 is correct, and if not, generate a Sender: header, unless disabled. Any
2470 previously-existing Sender: header was removed above. Note that sender_local,
2471 as well as being TRUE if the caller of exim is not trusted, is also true if a
2472 trusted caller did not supply a -f argument for non-smtp input. To allow
2473 trusted callers to forge From: without supplying -f, we have to test explicitly
2474 here. If the From: header contains more than one address, then the call to
2475 parse_extract_address fails, and a Sender: header is inserted, as required. */
2476
2477 if (from_header != NULL &&
2478 (active_local_from_check &&
2479 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2480 (submission_mode && authenticated_id != NULL))
2481 ))
2482 {
2483 BOOL make_sender = TRUE;
2484 int start, end, domain;
2485 uschar *errmess;
2486 uschar *from_address =
2487 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2488 &start, &end, &domain, FALSE);
2489 uschar *generated_sender_address;
2490
2491 if (submission_mode)
2492 {
2493 if (submission_domain == NULL)
2494 {
2495 generated_sender_address = string_sprintf("%s@%s",
2496 local_part_quote(authenticated_id), qualify_domain_sender);
2497 }
2498 else if (submission_domain[0] == 0) /* empty => full address */
2499 {
2500 generated_sender_address = string_sprintf("%s",
2501 authenticated_id);
2502 }
2503 else
2504 {
2505 generated_sender_address = string_sprintf("%s@%s",
2506 local_part_quote(authenticated_id), submission_domain);
2507 }
2508 }
2509 else
2510 generated_sender_address = string_sprintf("%s@%s",
2511 local_part_quote(originator_login), qualify_domain_sender);
2512
2513 /* Remove permitted prefixes and suffixes from the local part of the From:
2514 address before doing the comparison with the generated sender. */
2515
2516 if (from_address != NULL)
2517 {
2518 int slen;
2519 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2520
2521 if (at != NULL) *at = 0;
2522 from_address += route_check_prefix(from_address, local_from_prefix);
2523 slen = route_check_suffix(from_address, local_from_suffix);
2524 if (slen > 0)
2525 {
2526 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2527 from_address += slen;
2528 }
2529 if (at != NULL) *at = '@';
2530
2531 if (strcmpic(generated_sender_address, from_address) == 0 ||
2532 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2533 make_sender = FALSE;
2534 }
2535
2536 /* We have to cause the Sender header to be rewritten if there are
2537 appropriate rewriting rules. */
2538
2539 if (make_sender)
2540 {
2541 if (submission_mode && submission_name == NULL)
2542 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2543 generated_sender_address);
2544 else
2545 header_add(htype_sender, "%sSender: %s <%s>\n",
2546 resent_prefix,
2547 submission_mode? submission_name : originator_name,
2548 generated_sender_address);
2549 }
2550
2551 /* Ensure that a non-null envelope sender address corresponds to the
2552 submission mode sender address. */
2553
2554 if (submission_mode && sender_address[0] != 0)
2555 {
2556 if (sender_address_unrewritten == NULL)
2557 sender_address_unrewritten = sender_address;
2558 sender_address = generated_sender_address;
2559 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2560 log_write(L_address_rewrite, LOG_MAIN,
2561 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2562 sender_address_unrewritten, generated_sender_address);
2563 }
2564 }
2565
2566
2567 /* If there are any rewriting rules, apply them to the sender address, unless
2568 it has already been rewritten as part of verification for SMTP input. */
2569
2570 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2571 sender_address[0] != 0)
2572 {
2573 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2574 global_rewrite_rules, rewrite_existflags);
2575 DEBUG(D_receive|D_rewrite)
2576 debug_printf("rewritten sender = %s\n", sender_address);
2577 }
2578
2579
2580 /* The headers must be run through rewrite_header(), because it ensures that
2581 addresses are fully qualified, as well as applying any rewriting rules that may
2582 exist.
2583
2584 Qualification of header addresses in a message from a remote host happens only
2585 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2586 appropriate. For local messages, qualification always happens, unless -bnq is
2587 used to explicitly suppress it. No rewriting is done for an unqualified address
2588 that is left untouched.
2589
2590 We start at the second header, skipping our own Received:. This rewriting is
2591 documented as happening *after* recipient addresses are taken from the headers
2592 by the -t command line option. An added Sender: gets rewritten here. */
2593
2594 for (h = header_list->next; h != NULL; h = h->next)
2595 {
2596 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2597 rewrite_existflags, TRUE);
2598 if (newh != NULL) h = newh;
2599 }
2600
2601
2602 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2603 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2604 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2605 exists, this applies to the set of resent- headers rather than the normal set.
2606
2607 The requirement for a recipient header has been removed in RFC 2822. At this
2608 point in the code, earlier versions of Exim added a To: header for locally
2609 submitted messages, and an empty Bcc: header for others. In the light of the
2610 changes in RFC 2822, this was dropped in November 2003. */
2611
2612
2613 /* If there is no date header, generate one if the message originates locally
2614 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2615 submission mode flag is set. Messages without Date: are not valid, but it seems
2616 to be more confusing if Exim adds one to all remotely-originated messages.
2617 As per Message-Id, we prepend if resending, else append.
2618 */
2619
2620 if (!date_header_exists &&
2621 ((sender_host_address == NULL && !suppress_local_fixups)
2622 || submission_mode))
2623 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2624 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2625
2626 search_tidyup(); /* Free any cached resources */
2627
2628 /* Show the complete set of headers if debugging. Note that the first one (the
2629 new Received:) has not yet been set. */
2630
2631 DEBUG(D_receive)
2632 {
2633 debug_printf(">>Headers after rewriting and local additions:\n");
2634 for (h = header_list->next; h != NULL; h = h->next)
2635 debug_printf("%c %s", h->type, h->text);
2636 debug_printf("\n");
2637 }
2638
2639 /* The headers are now complete in store. If we are running in filter
2640 testing mode, that is all this function does. Return TRUE if the message
2641 ended with a dot. */
2642
2643 if (filter_test != FTEST_NONE)
2644 {
2645 process_info[process_info_len] = 0;
2646 return message_ended == END_DOT;
2647 }
2648
2649 /* Open a new spool file for the data portion of the message. We need
2650 to access it both via a file descriptor and a stream. Try to make the
2651 directory if it isn't there. Note re use of sprintf: spool_directory
2652 is checked on input to be < 200 characters long. */
2653
2654 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2655 message_id);
2656 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2657 if (data_fd < 0)
2658 {
2659 if (errno == ENOENT)
2660 {
2661 uschar temp[16];
2662 sprintf(CS temp, "input/%s", message_subdir);
2663 if (message_subdir[0] == 0) temp[5] = 0;
2664 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2665 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2666 }
2667 if (data_fd < 0)
2668 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2669 spool_name, strerror(errno));
2670 }
2671
2672 /* Make sure the file's group is the Exim gid, and double-check the mode
2673 because the group setting doesn't always get set automatically. */
2674
2675 (void)fchown(data_fd, exim_uid, exim_gid);
2676 (void)fchmod(data_fd, SPOOL_MODE);
2677
2678 /* We now have data file open. Build a stream for it and lock it. We lock only
2679 the first line of the file (containing the message ID) because otherwise there
2680 are problems when Exim is run under Cygwin (I'm told). See comments in
2681 spool_in.c, where the same locking is done. */
2682
2683 data_file = fdopen(data_fd, "w+");
2684 lock_data.l_type = F_WRLCK;
2685 lock_data.l_whence = SEEK_SET;
2686 lock_data.l_start = 0;
2687 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2688
2689 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2690 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2691 errno, strerror(errno));
2692
2693 /* We have an open, locked data file. Write the message id to it to make it
2694 self-identifying. Then read the remainder of the input of this message and
2695 write it to the data file. If the variable next != NULL, it contains the first
2696 data line (which was read as a header but then turned out not to have the right
2697 format); write it (remembering that it might contain binary zeros). The result
2698 of fwrite() isn't inspected; instead we call ferror() below. */
2699
2700 fprintf(data_file, "%s-D\n", message_id);
2701 if (next != NULL)
2702 {
2703 uschar *s = next->text;
2704 int len = next->slen;
2705 (void)fwrite(s, 1, len, data_file);
2706 body_linecount++; /* Assumes only 1 line */
2707 }
2708
2709 /* Note that we might already be at end of file, or the logical end of file
2710 (indicated by '.'), or might have encountered an error while writing the
2711 message id or "next" line. */
2712
2713 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2714 {
2715 if (smtp_input)
2716 {
2717 message_ended = read_message_data_smtp(data_file);
2718 receive_linecount++; /* The terminating "." line */
2719 }
2720 else message_ended = read_message_data(data_file);
2721
2722 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2723 message_linecount += body_linecount;
2724
2725 /* Handle premature termination of SMTP */
2726
2727 if (smtp_input && message_ended == END_EOF)
2728 {
2729 Uunlink(spool_name); /* Lose data file when closed */
2730 message_id[0] = 0; /* Indicate no message accepted */
2731 smtp_reply = handle_lost_connection(US"");
2732 smtp_yield = FALSE;
2733 goto TIDYUP; /* Skip to end of function */
2734 }
2735
2736 /* Handle message that is too big. Don't use host_or_ident() in the log
2737 message; we want to see the ident value even for non-remote messages. */
2738
2739 if (message_ended == END_SIZE)
2740 {
2741 Uunlink(spool_name); /* Lose the data file when closed */
2742 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2743
2744 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2745 "message too big: read=%d max=%d",
2746 sender_address,
2747 (sender_fullhost == NULL)? "" : " H=",
2748 (sender_fullhost == NULL)? US"" : sender_fullhost,
2749 (sender_ident == NULL)? "" : " U=",
2750 (sender_ident == NULL)? US"" : sender_ident,
2751 message_size,
2752 thismessage_size_limit);
2753
2754 if (smtp_input)
2755 {
2756 smtp_reply = US"552 Message size exceeds maximum permitted";
2757 message_id[0] = 0; /* Indicate no message accepted */
2758 goto TIDYUP; /* Skip to end of function */
2759 }
2760 else
2761 {
2762 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2763 give_local_error(ERRMESS_TOOBIG,
2764 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2765 US"message rejected: ", error_rc, data_file, header_list);
2766 /* Does not return */
2767 }
2768 }
2769 }
2770
2771 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2772 example, there may be some expansion in an ACL that uses a timer.) */
2773
2774 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2775
2776 /* The message body has now been read into the data file. Call fflush() to
2777 empty the buffers in C, and then call fsync() to get the data written out onto
2778 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2779 having to do this). If there was an I/O error on either input or output,
2780 attempt to send an error message, and unlink the spool file. For non-SMTP input
2781 we can then give up. Note that for SMTP input we must swallow the remainder of
2782 the input in cases of output errors, since the far end doesn't expect to see
2783 anything until the terminating dot line is sent. */
2784
2785 if (fflush(data_file) == EOF || ferror(data_file) ||
2786 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2787 {
2788 uschar *msg_errno = US strerror(errno);
2789 BOOL input_error = (receive_ferror)() != 0;
2790 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2791 input_error? "Input read" : "Spool write",
2792 msg_errno,
2793 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2794
2795 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2796 Uunlink(spool_name); /* Lose the data file */
2797
2798 if (smtp_input)
2799 {
2800 if (input_error)
2801 smtp_reply = US"451 Error while reading input data";
2802 else
2803 {
2804 smtp_reply = US"451 Error while writing spool file";
2805 receive_swallow_smtp();
2806 }
2807 message_id[0] = 0; /* Indicate no message accepted */
2808 goto TIDYUP; /* Skip to end of function */
2809 }
2810
2811 else
2812 {
2813 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2814 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2815 header_list);
2816 /* Does not return */
2817 }
2818 }
2819
2820
2821 /* No I/O errors were encountered while writing the data file. */
2822
2823 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2824
2825
2826 /* If there were any bad addresses extracted by -t, or there were no recipients
2827 left after -t, send a message to the sender of this message, or write it to
2828 stderr if the error handling option is set that way. Note that there may
2829 legitimately be no recipients for an SMTP message if they have all been removed
2830 by "discard".
2831
2832 We need to rewind the data file in order to read it. In the case of no
2833 recipients or stderr error writing, throw the data file away afterwards, and
2834 exit. (This can't be SMTP, which always ensures there's at least one
2835 syntactically good recipient address.) */
2836
2837 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2838 {
2839 DEBUG(D_receive)
2840 {
2841 if (recipients_count == 0) debug_printf("*** No recipients\n");
2842 if (bad_addresses != NULL)
2843 {
2844 error_block *eblock = bad_addresses;
2845 debug_printf("*** Bad address(es)\n");
2846 while (eblock != NULL)
2847 {
2848 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2849 eblock = eblock->next;
2850 }
2851 }
2852 }
2853
2854 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2855
2856 /* If configured to send errors to the sender, but this fails, force
2857 a failure error code. We use a special one for no recipients so that it
2858 can be detected by the autoreply transport. Otherwise error_rc is set to
2859 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2860 it is EXIT_SUCCESS. */
2861
2862 if (error_handling == ERRORS_SENDER)
2863 {
2864 if (!moan_to_sender(
2865 (bad_addresses == NULL)?
2866 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2867 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2868 bad_addresses, header_list, data_file, FALSE))
2869 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2870 }
2871 else
2872 {
2873 if (bad_addresses == NULL)
2874 {
2875 if (extracted_ignored)
2876 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2877 else
2878 fprintf(stderr, "exim: no recipients in message\n");
2879 }
2880 else
2881 {
2882 fprintf(stderr, "exim: invalid address%s",
2883 (bad_addresses->next == NULL)? ":" : "es:\n");
2884 while (bad_addresses != NULL)
2885 {
2886 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2887 bad_addresses->text2);
2888 bad_addresses = bad_addresses->next;
2889 }
2890 }
2891 }
2892
2893 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2894 {
2895 Uunlink(spool_name);
2896 (void)fclose(data_file);
2897 exim_exit(error_rc);
2898 }
2899 }
2900
2901 /* Data file successfully written. Generate text for the Received: header by
2902 expanding the configured string, and adding a timestamp. By leaving this
2903 operation till now, we ensure that the timestamp is the time that message
2904 reception was completed. However, this is deliberately done before calling the
2905 data ACL and local_scan().
2906
2907 This Received: header may therefore be inspected by the data ACL and by code in
2908 the local_scan() function. When they have run, we update the timestamp to be
2909 the final time of reception.
2910
2911 If there is just one recipient, set up its value in the $received_for variable
2912 for use when we generate the Received: header.
2913
2914 Note: the checking for too many Received: headers is handled by the delivery
2915 code. */
2916
2917 timestamp = expand_string(US"${tod_full}");
2918 if (recipients_count == 1) received_for = recipients_list[0].address;
2919 received = expand_string(received_header_text);
2920 received_for = NULL;
2921
2922 if (received == NULL)
2923 {
2924 Uunlink(spool_name); /* Lose the data file */
2925 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2926 "(received_header_text) failed: %s", string_printing(received_header_text),
2927 expand_string_message);
2928 }
2929
2930 /* The first element on the header chain is reserved for the Received header,
2931 so all we have to do is fill in the text pointer, and set the type. However, if
2932 the result of the expansion is an empty string, we leave the header marked as
2933 "old" so as to refrain from adding a Received header. */
2934
2935 if (received[0] == 0)
2936 {
2937 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2938 received_header->type = htype_old;
2939 }
2940 else
2941 {
2942 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2943 received_header->type = htype_received;
2944 }
2945
2946 received_header->slen = Ustrlen(received_header->text);
2947
2948 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2949 received_header->type, received_header->text);
2950
2951 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2952
2953 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2954 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2955
2956 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2957 now, before running the DATA ACL. */
2958
2959 add_acl_headers(US"MAIL or RCPT");
2960
2961 /* If an ACL is specified for checking things at this stage of reception of a
2962 message, run it, unless all the recipients were removed by "discard" in earlier
2963 ACLs. That is the only case in which recipients_count can be zero at this
2964 stage. Set deliver_datafile to point to the data file so that $message_body and
2965 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2966 */
2967
2968 deliver_datafile = data_fd;
2969 user_msg = NULL;
2970
2971 enable_dollar_recipients = TRUE;
2972
2973 if (recipients_count == 0)
2974 {
2975 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2976 }
2977 else
2978 {
2979 /* Handle interactive SMTP messages */
2980
2981 if (smtp_input && !smtp_batched_input)
2982 {
2983
2984 #ifndef DISABLE_DKIM
2985 if (!dkim_disable_verify)
2986 {
2987 /* Finish verification, this will log individual signature results to
2988 the mainlog */
2989 dkim_exim_verify_finish();
2990
2991 /* Check if we must run the DKIM ACL */
2992 if ((acl_smtp_dkim != NULL) &&
2993 (dkim_verify_signers != NULL) &&
2994 (dkim_verify_signers[0] != '\0'))
2995 {
2996 uschar *dkim_verify_signers_expanded =
2997 expand_string(dkim_verify_signers);
2998 if (dkim_verify_signers_expanded == NULL)
2999 {
3000 log_write(0, LOG_MAIN|LOG_PANIC,
3001 "expansion of dkim_verify_signers option failed: %s",
3002 expand_string_message);
3003 }
3004 else
3005 {
3006 int sep = 0;
3007 uschar *ptr = dkim_verify_signers_expanded;
3008 uschar *item = NULL;
3009 uschar *seen_items = NULL;
3010 int seen_items_size = 0;
3011 int seen_items_offset = 0;
3012 uschar itembuf[256];
3013 /* Default to OK when no items are present */
3014 rc = OK;
3015 while ((item = string_nextinlist(&ptr, &sep,
3016 itembuf,
3017 sizeof(itembuf))) != NULL)
3018 {
3019 /* Prevent running ACL for an empty item */
3020 if (!item || (item[0] == '\0')) continue;
3021 /* Only run ACL once for each domain or identity, no matter how often it
3022 appears in the expanded list. */
3023 if (seen_items != NULL)
3024 {
3025 uschar *seen_items_list = seen_items;
3026 if (match_isinlist(item,
3027 &seen_items_list,0,NULL,NULL,MCL_STRING,TRUE,NULL) == OK)
3028 {
3029 DEBUG(D_receive)
3030 debug_printf("acl_smtp_dkim: skipping signer %s, already seen\n", item);
3031 continue;
3032 }
3033 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,":");
3034 }
3035
3036 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,item);
3037 seen_items[seen_items_offset] = '\0';
3038
3039 DEBUG(D_receive)
3040 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n", item);
3041
3042 dkim_exim_acl_setup(item);
3043 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, &user_msg, &log_msg);
3044
3045 if (rc != OK)
3046 {
3047 DEBUG(D_receive)
3048 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, skipping remaining items\n", rc, item);
3049 break;
3050 }
3051 }
3052 add_acl_headers(US"DKIM");
3053 if (rc == DISCARD)
3054 {
3055 recipients_count = 0;
3056 blackholed_by = US"DKIM ACL";
3057 if (log_msg != NULL)
3058 blackhole_log_msg = string_sprintf(": %s", log_msg);
3059 }
3060 else if (rc != OK)
3061 {
3062 Uunlink(spool_name);
3063 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3064 smtp_yield = FALSE; /* No more messsages after dropped connection */
3065 smtp_reply = US""; /* Indicate reply already sent */
3066 message_id[0] = 0; /* Indicate no message accepted */
3067 goto TIDYUP; /* Skip to end of function */
3068 }
3069 }
3070 }
3071 }
3072 #endif /* DISABLE_DKIM */
3073
3074 #ifdef WITH_CONTENT_SCAN
3075 if (recipients_count > 0 &&
3076 acl_smtp_mime != NULL &&
3077 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3078 goto TIDYUP;
3079 #endif /* WITH_CONTENT_SCAN */
3080
3081 /* Check the recipients count again, as the MIME ACL might have changed
3082 them. */
3083
3084 if (acl_smtp_data != NULL && recipients_count > 0)
3085 {
3086 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3087 add_acl_headers(US"DATA");
3088 if (rc == DISCARD)
3089 {
3090 recipients_count = 0;
3091 blackholed_by = US"DATA ACL";
3092 if (log_msg != NULL)
3093 blackhole_log_msg = string_sprintf(": %s", log_msg);
3094 }
3095 else if (rc != OK)
3096 {
3097 Uunlink(spool_name);
3098 #ifdef WITH_CONTENT_SCAN
3099 unspool_mbox();
3100 #endif
3101 #ifdef EXPERIMENTAL_DCC
3102 dcc_ok = 0;
3103 #endif
3104 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3105 smtp_yield = FALSE; /* No more messsages after dropped connection */
3106 smtp_reply = US""; /* Indicate reply already sent */
3107 message_id[0] = 0; /* Indicate no message accepted */
3108 goto TIDYUP; /* Skip to end of function */
3109 }
3110 }
3111 }
3112
3113 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3114 we cannot take different actions for permanent and temporary rejections. */
3115
3116 else
3117 {
3118
3119 #ifdef WITH_CONTENT_SCAN
3120 if (acl_not_smtp_mime != NULL &&
3121 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3122 &blackholed_by))
3123 goto TIDYUP;
3124 #endif /* WITH_CONTENT_SCAN */
3125
3126 if (acl_not_smtp != NULL)
3127 {
3128 uschar *user_msg, *log_msg;
3129 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3130 if (rc == DISCARD)
3131 {
3132 recipients_count = 0;
3133 blackholed_by = US"non-SMTP ACL";
3134 if (log_msg != NULL)
3135 blackhole_log_msg = string_sprintf(": %s", log_msg);
3136 }
3137 else if (rc != OK)
3138 {
3139 Uunlink(spool_name);
3140 #ifdef WITH_CONTENT_SCAN
3141 unspool_mbox();
3142 #endif
3143 #ifdef EXPERIMENTAL_DCC
3144 dcc_ok = 0;
3145 #endif
3146 /* The ACL can specify where rejections are to be logged, possibly
3147 nowhere. The default is main and reject logs. */
3148
3149 if (log_reject_target != 0)
3150 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3151 sender_address, log_msg);
3152
3153 if (user_msg == NULL) user_msg = US"local configuration problem";
3154 if (smtp_batched_input)
3155 {
3156 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3157 /* Does not return */
3158 }
3159 else
3160 {
3161 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3162 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3163 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3164 header_list);
3165 /* Does not return */
3166 }
3167 }
3168 add_acl_headers(US"non-SMTP");
3169 }
3170 }
3171
3172 /* The applicable ACLs have been run */
3173
3174 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3175 if (queue_only_policy) queued_by = US"ACL";
3176 }
3177
3178 #ifdef WITH_CONTENT_SCAN
3179 unspool_mbox();
3180 #endif
3181
3182 #ifdef EXPERIMENTAL_DCC
3183 dcc_ok = 0;
3184 #endif
3185
3186
3187 /* The final check on the message is to run the scan_local() function. The
3188 version supplied with Exim always accepts, but this is a hook for sysadmins to
3189 supply their own checking code. The local_scan() function is run even when all
3190 the recipients have been discarded. */
3191
3192 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3193
3194 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3195 deleted, and the incident gets logged. */
3196
3197 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3198 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3199 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3200 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3201
3202 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3203 local_scan_timeout);
3204 local_scan_data = NULL;
3205
3206 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3207 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3208 rc = local_scan(data_fd, &local_scan_data);
3209 alarm(0);
3210 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3211
3212 enable_dollar_recipients = FALSE;
3213
3214 store_pool = POOL_MAIN; /* In case changed */
3215 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3216 local_scan_data);
3217
3218 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3219 os_non_restarting_signal(SIGFPE, SIG_DFL);
3220 os_non_restarting_signal(SIGILL, SIG_DFL);
3221 os_non_restarting_signal(SIGBUS, SIG_DFL);
3222
3223 /* The length check is paranoia against some runaway code, and also because
3224 (for a success return) lines in the spool file are read into big_buffer. */
3225
3226 if (local_scan_data != NULL)
3227 {
3228 int len = Ustrlen(local_scan_data);
3229 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3230 local_scan_data = string_copyn(local_scan_data, len);
3231 }
3232
3233 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3234 {
3235 if (!deliver_freeze) /* ACL might have already frozen */
3236 {
3237 deliver_freeze = TRUE;
3238 deliver_frozen_at = time(NULL);
3239 frozen_by = US"local_scan()";
3240 }
3241 rc = LOCAL_SCAN_ACCEPT;
3242 }
3243 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3244 {
3245 if (!queue_only_policy) /* ACL might have already queued */
3246 {
3247 queue_only_policy = TRUE;
3248 queued_by = US"local_scan()";
3249 }
3250 rc = LOCAL_SCAN_ACCEPT;
3251 }
3252
3253 /* Message accepted: remove newlines in local_scan_data because otherwise
3254 the spool file gets corrupted. Ensure that all recipients are qualified. */
3255
3256 if (rc == LOCAL_SCAN_ACCEPT)
3257 {
3258 if (local_scan_data != NULL)
3259 {
3260 uschar *s;
3261 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3262 }
3263 for (i = 0; i < recipients_count; i++)
3264 {
3265 recipient_item *r = recipients_list + i;
3266 r->address = rewrite_address_qualify(r->address, TRUE);
3267 if (r->errors_to != NULL)
3268 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3269 }
3270 if (recipients_count == 0 && blackholed_by == NULL)
3271 blackholed_by = US"local_scan";
3272 }
3273
3274 /* Message rejected: newlines permitted in local_scan_data to generate
3275 multiline SMTP responses. */
3276
3277 else
3278 {
3279 uschar *istemp = US"";
3280 uschar *s = NULL;
3281 uschar *smtp_code;
3282 int size = 0;
3283 int sptr = 0;
3284
3285 errmsg = local_scan_data;
3286
3287 Uunlink(spool_name); /* Cancel this message */
3288 switch(rc)
3289 {
3290 default:
3291 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3292 "rejection given", rc);
3293 goto TEMPREJECT;
3294
3295 case LOCAL_SCAN_REJECT_NOLOGHDR:
3296 log_extra_selector &= ~LX_rejected_header;
3297 /* Fall through */
3298
3299 case LOCAL_SCAN_REJECT:
3300 smtp_code = US"550";
3301 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3302 break;
3303
3304 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3305 log_extra_selector &= ~LX_rejected_header;
3306 /* Fall through */
3307
3308 case LOCAL_SCAN_TEMPREJECT:
3309 TEMPREJECT:
3310 smtp_code = US"451";
3311 if (errmsg == NULL) errmsg = US"Temporary local problem";
3312 istemp = US"temporarily ";
3313 break;
3314 }
3315
3316 s = string_append(s, &size, &sptr, 2, US"F=",
3317 (sender_address[0] == 0)? US"<>" : sender_address);
3318 s = add_host_info_for_log(s, &size, &sptr);
3319 s[sptr] = 0;
3320
3321 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3322 s, istemp, string_printing(errmsg));
3323
3324 if (smtp_input)
3325 {
3326 if (!smtp_batched_input)
3327 {
3328 smtp_respond(smtp_code, 3, TRUE, errmsg);
3329 message_id[0] = 0; /* Indicate no message accepted */
3330 smtp_reply = US""; /* Indicate reply already sent */
3331 goto TIDYUP; /* Skip to end of function */
3332 }
3333 else
3334 {
3335 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3336 /* Does not return */
3337 }
3338 }
3339 else
3340 {
3341 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3342 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3343 US"message rejected by local scan code: ", error_rc, data_file,
3344 header_list);
3345 /* Does not return */
3346 }
3347 }
3348
3349 /* Reset signal handlers to ignore signals that previously would have caused
3350 the message to be abandoned. */
3351
3352 signal(SIGTERM, SIG_IGN);
3353 signal(SIGINT, SIG_IGN);
3354
3355 /* Ensure the first time flag is set in the newly-received message. */
3356
3357 deliver_firsttime = TRUE;
3358
3359 #ifdef EXPERIMENTAL_BRIGHTMAIL
3360 if (bmi_run == 1) {
3361 /* rewind data file */
3362 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3363 bmi_verdicts = bmi_process_message(header_list, data_fd);
3364 };
3365 #endif
3366
3367 /* Update the timstamp in our Received: header to account for any time taken by
3368 an ACL or by local_scan(). The new time is the time that all reception
3369 processing is complete. */
3370
3371 timestamp = expand_string(US"${tod_full}");
3372 tslen = Ustrlen(timestamp);
3373
3374 memcpy(received_header->text + received_header->slen - tslen - 1,
3375 timestamp, tslen);
3376
3377 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3378
3379 if (mua_wrapper)
3380 {
3381 deliver_freeze = FALSE;
3382 queue_only_policy = FALSE;
3383 }
3384
3385 /* Keep the data file open until we have written the header file, in order to
3386 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3387 don't write the header file, and we unlink the data file. If writing the header
3388 file fails, we have failed to accept this message. */
3389
3390 if (host_checking || blackholed_by != NULL)
3391 {
3392 header_line *h;
3393 Uunlink(spool_name);
3394 msg_size = 0; /* Compute size for log line */
3395 for (h = header_list; h != NULL; h = h->next)
3396 if (h->type != '*') msg_size += h->slen;
3397 }
3398
3399 /* Write the -H file */
3400
3401 else
3402 {
3403 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3404 {
3405 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3406 Uunlink(spool_name); /* Lose the data file */
3407
3408 if (smtp_input)
3409 {
3410 smtp_reply = US"451 Error in writing spool file";
3411 message_id[0] = 0; /* Indicate no message accepted */
3412 goto TIDYUP;
3413 }
3414 else
3415 {
3416 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3417 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3418 header_list);
3419 /* Does not return */
3420 }
3421 }
3422 }
3423
3424
3425 /* The message has now been successfully received. */
3426
3427 receive_messagecount++;
3428
3429 /* In SMTP sessions we may receive several in one connection. After each one,
3430 we wait for the clock to tick at the level of message-id granularity. This is
3431 so that the combination of time+pid is unique, even on systems where the pid
3432 can be re-used within our time interval. We can't shorten the interval without
3433 re-designing the message-id. See comments above where the message id is
3434 created. This is Something For The Future. */
3435
3436 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3437 exim_wait_tick(&message_id_tv, id_resolution);
3438
3439 /* Add data size to written header size. We do not count the initial file name
3440 that is in the file, but we do add one extra for the notional blank line that
3441 precedes the data. This total differs from message_size in that it include the
3442 added Received: header and any other headers that got created locally. */
3443
3444 fflush(data_file);
3445 fstat(data_fd, &statbuf);
3446
3447 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3448
3449 /* Generate a "message received" log entry. We do this by building up a dynamic
3450 string as required. Since we commonly want to add two items at a time, use a
3451 macro to simplify the coding. We log the arrival of a new message while the
3452 file is still locked, just in case the machine is *really* fast, and delivers
3453 it first! Include any message id that is in the message - since the syntax of a
3454 message id is actually an addr-spec, we can use the parse routine to canonicize
3455 it. */
3456
3457 size = 256;
3458 sptr = 0;
3459 s = store_get(size);
3460
3461 s = string_append(s, &size, &sptr, 2, US"<= ",
3462 (sender_address[0] == 0)? US"<>" : sender_address);
3463 if (message_reference != NULL)
3464 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3465
3466 s = add_host_info_for_log(s, &size, &sptr);
3467
3468 #ifdef SUPPORT_TLS
3469 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3470 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3471 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3472 tls_cipher != NULL)
3473 s = string_append(s, &size, &sptr, 2, US" CV=",
3474 tls_certificate_verified? "yes":"no");
3475 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3476 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3477 string_printing(tls_peerdn), US"\"");
3478 #endif
3479
3480 if (sender_host_authenticated != NULL)
3481 {
3482 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3483 if (authenticated_id != NULL)
3484 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3485 }
3486
3487 sprintf(CS big_buffer, "%d", msg_size);
3488 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3489
3490 /* If an addr-spec in a message-id contains a quoted string, it can contain
3491 any characters except " \ and CR and so in particular it can contain NL!
3492 Therefore, make sure we use a printing-characters only version for the log.
3493 Also, allow for domain literals in the message id. */
3494