Add sender to log line for DATA timeout.
[exim.git] / src / src / receive.c
1 /* $Cambridge: exim/src/src/receive.c,v 1.14 2005/04/06 16:43:59 ph10 Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
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_DOMAINKEYS
15 #define RECEIVE_GETC dk_receive_getc
16 #define RECEIVE_UNGETC dk_receive_ungetc
17 #else
18 #define RECEIVE_GETC receive_getc
19 #define RECEIVE_UNGETC receive_ungetc
20 #endif
21
22 /*************************************************
23 * Local static variables *
24 *************************************************/
25
26 static FILE *data_file = NULL;
27 static int data_fd = -1;
28 static uschar spool_name[256];
29
30
31
32 /*************************************************
33 * Non-SMTP character reading functions *
34 *************************************************/
35
36 /* These are the default functions that are set up in the variables such as
37 receive_getc initially. They just call the standard functions, passing stdin as
38 the file. (When SMTP input is occurring, different functions are used by
39 changing the pointer variables.) */
40
41 int
42 stdin_getc(void)
43 {
44 return getc(stdin);
45 }
46
47 int
48 stdin_ungetc(int c)
49 {
50 return ungetc(c, stdin);
51 }
52
53 int
54 stdin_feof(void)
55 {
56 return feof(stdin);
57 }
58
59 int
60 stdin_ferror(void)
61 {
62 return ferror(stdin);
63 }
64
65
66
67
68 /*************************************************
69 * Check that a set sender is allowed *
70 *************************************************/
71
72 /* This function is called when a local caller sets an explicit sender address.
73 It checks whether this is permitted, which it is for trusted callers.
74 Otherwise, it must match the pattern(s) in untrusted_set_sender.
75
76 Arguments: the proposed sender address
77 Returns: TRUE for a trusted caller
78 TRUE if the address has been set, untrusted_set_sender has been
79 set, and the address matches something in the list
80 FALSE otherwise
81 */
82
83 BOOL
84 receive_check_set_sender(uschar *newsender)
85 {
86 uschar *qnewsender;
87 if (trusted_caller) return TRUE;
88 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
89 qnewsender = (Ustrchr(newsender, '@') != NULL)?
90 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
91 return
92 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
93 0, NULL) == OK;
94 }
95
96
97
98
99 /*************************************************
100 * Read space info for a partition *
101 *************************************************/
102
103 /* This function is called by receive_check_fs() below, and also by string
104 expansion for variables such as $spool_space. The field names for the statvfs
105 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
106 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
107 have inodes, and they return -1 for the number available.
108
109 Later: It turns out that some file systems that do not have the concept of
110 inodes return 0 rather than -1. Such systems should also return 0 for the total
111 number of inodes, so we require that to be greater than zero before returning
112 an inode count.
113
114 Arguments:
115 isspool TRUE for spool partition, FALSE for log partition
116 inodeptr address of int to receive inode count; -1 if there isn't one
117
118 Returns: available on-root space, in kilobytes
119 -1 for log partition if there isn't one
120
121 All values are -1 if the STATFS functions are not available.
122 */
123
124 int
125 receive_statvfs(BOOL isspool, int *inodeptr)
126 {
127 #ifdef HAVE_STATFS
128 struct STATVFS statbuf;
129 uschar *path;
130 uschar *name;
131 uschar buffer[1024];
132
133 /* The spool directory must always exist. */
134
135 if (isspool)
136 {
137 path = spool_directory;
138 name = US"spool";
139 }
140
141 /* Need to cut down the log file path to the directory, and to ignore any
142 appearance of "syslog" in it. */
143
144 else
145 {
146 int sep = ':'; /* Not variable - outside scripts use */
147 uschar *p = log_file_path;
148 name = US"log";
149
150 /* An empty log_file_path means "use the default". This is the same as an
151 empty item in a list. */
152
153 if (*p == 0) p = US":";
154 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
155 {
156 if (Ustrcmp(path, "syslog") != 0) break;
157 }
158
159 if (path == NULL) /* No log files */
160 {
161 *inodeptr = -1;
162 return -1;
163 }
164
165 /* An empty string means use the default, which is in the spool directory.
166 But don't just use the spool directory, as it is possible that the log
167 subdirectory has been symbolically linked elsewhere. */
168
169 if (path[0] == 0)
170 {
171 sprintf(CS buffer, CS"%s/log", CS spool_directory);
172 path = buffer;
173 }
174 else
175 {
176 uschar *cp;
177 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
178 }
179 }
180
181 /* We now have the patch; do the business */
182
183 memset(&statbuf, 0, sizeof(statbuf));
184
185 if (STATVFS(CS path, &statbuf) != 0)
186 {
187 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
188 "%s directory %s: %s", name, spool_directory, strerror(errno));
189 smtp_closedown(US"spool or log directory problem");
190 exim_exit(EXIT_FAILURE);
191 }
192
193 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
194
195 /* Disks are getting huge. Take care with computing the size in kilobytes. */
196
197 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
198
199 /* Unable to find partition sizes in this environment. */
200
201 #else
202 *inodeptr = -1;
203 return -1;
204 #endif
205 }
206
207
208
209
210 /*************************************************
211 * Check space on spool and log partitions *
212 *************************************************/
213
214 /* This function is called before accepting a message; if any thresholds are
215 set, it checks them. If a message_size is supplied, it checks that there is
216 enough space for that size plus the threshold - i.e. that the message won't
217 reduce the space to the threshold. Not all OS have statvfs(); for those that
218 don't, this function always returns TRUE. For some OS the old function and
219 struct name statfs is used; that is handled by a macro, defined in exim.h.
220
221 Arguments:
222 msg_size the (estimated) size of an incoming message
223
224 Returns: FALSE if there isn't enough space, or if the information cannot
225 be obtained
226 TRUE if no check was done or there is enough space
227 */
228
229 BOOL
230 receive_check_fs(int msg_size)
231 {
232 int space, inodes;
233
234 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
235 {
236 space = receive_statvfs(TRUE, &inodes);
237
238 DEBUG(D_receive)
239 debug_printf("spool directory space = %dK inodes = %d "
240 "check_space = %dK inodes = %d msg_size = %d\n",
241 space, inodes, check_spool_space, check_spool_inodes, msg_size);
242
243 if ((space >= 0 && space < check_spool_space) ||
244 (inodes >= 0 && inodes < check_spool_inodes))
245 {
246 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
247 "inodes=%d", space, inodes);
248 return FALSE;
249 }
250 }
251
252 if (check_log_space > 0 || check_log_inodes > 0)
253 {
254 space = receive_statvfs(FALSE, &inodes);
255
256 DEBUG(D_receive)
257 debug_printf("log directory space = %dK inodes = %d "
258 "check_space = %dK inodes = %d\n",
259 space, inodes, check_log_space, check_log_inodes);
260
261 if ((space >= 0 && space < check_log_space) ||
262 (inodes >= 0 && inodes < check_log_inodes))
263 {
264 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
265 "inodes=%d", space, inodes);
266 return FALSE;
267 }
268 }
269
270 return TRUE;
271 }
272
273
274
275 /*************************************************
276 * Bomb out while reading a message *
277 *************************************************/
278
279 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
280 received, or if there is a timeout. A rarer case might be if the log files are
281 screwed up and Exim can't open them to record a message's arrival. Handling
282 that case is done by setting a flag to cause the log functions to call this
283 function if there is an ultimate disaster. That is why it is globally
284 accessible.
285
286 Arguments: SMTP response to give if in an SMTP session
287 Returns: it doesn't
288 */
289
290 void
291 receive_bomb_out(uschar *msg)
292 {
293 /* If spool_name is set, it contains the name of the data file that is being
294 written. Unlink it before closing so that it cannot be picked up by a delivery
295 process. Ensure that any header file is also removed. */
296
297 if (spool_name[0] != 0)
298 {
299 Uunlink(spool_name);
300 spool_name[Ustrlen(spool_name) - 1] = 'H';
301 Uunlink(spool_name);
302 }
303
304 /* Now close the file if it is open, either as a fd or a stream. */
305
306 if (data_file != NULL) fclose(data_file);
307 else if (data_fd >= 0) close(data_fd);
308
309 /* Attempt to close down an SMTP connection tidily. */
310
311 if (smtp_input)
312 {
313 if (!smtp_batched_input)
314 {
315 smtp_printf("421 %s %s - closing connection.\r\n", smtp_active_hostname,
316 msg);
317 mac_smtp_fflush();
318 }
319
320 /* Control does not return from moan_smtp_batch(). */
321
322 else moan_smtp_batch(NULL, "421 %s - message abandoned", msg);
323 }
324
325 /* Exit from the program (non-BSMTP cases) */
326
327 exim_exit(EXIT_FAILURE);
328 }
329
330
331 /*************************************************
332 * Data read timeout *
333 *************************************************/
334
335 /* Handler function for timeouts that occur while reading the data that
336 comprises a message.
337
338 Argument: the signal number
339 Returns: nothing
340 */
341
342 static void
343 data_timeout_handler(int sig)
344 {
345 uschar *msg = NULL;
346
347 sig = sig; /* Keep picky compilers happy */
348
349 if (smtp_input)
350 {
351 msg = US"SMTP incoming data timeout";
352 log_write(L_lost_incoming_connection,
353 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
354 "from %s F=<%s>",
355 (sender_fullhost != NULL)? sender_fullhost : US"local process",
356 sender_address);
357 }
358 else
359 {
360 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
361 log_write(L_lost_incoming_connection,
362 LOG_MAIN, "timed out while reading local message");
363 }
364
365 receive_bomb_out(msg); /* Does not return */
366 }
367
368
369
370 /*************************************************
371 * local_scan() timeout *
372 *************************************************/
373
374 /* Handler function for timeouts that occur while running a local_scan()
375 function.
376
377 Argument: the signal number
378 Returns: nothing
379 */
380
381 static void
382 local_scan_timeout_handler(int sig)
383 {
384 sig = sig; /* Keep picky compilers happy */
385 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
386 "message temporarily rejected (size %d)", message_size);
387 receive_bomb_out(US"local verification problem"); /* Does not return */
388 }
389
390
391
392 /*************************************************
393 * local_scan() crashed *
394 *************************************************/
395
396 /* Handler function for signals that occur while running a local_scan()
397 function.
398
399 Argument: the signal number
400 Returns: nothing
401 */
402
403 static void
404 local_scan_crash_handler(int sig)
405 {
406 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
407 "signal %d - message temporarily rejected (size %d)", sig, message_size);
408 receive_bomb_out(US"local verification problem"); /* Does not return */
409 }
410
411
412 /*************************************************
413 * SIGTERM or SIGINT received *
414 *************************************************/
415
416 /* Handler for SIGTERM or SIGINT signals that occur while reading the
417 data that comprises a message.
418
419 Argument: the signal number
420 Returns: nothing
421 */
422
423 static void
424 data_sigterm_sigint_handler(int sig)
425 {
426 uschar *msg = NULL;
427
428 if (smtp_input)
429 {
430 msg = US"Service not available - SIGTERM or SIGINT received";
431 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
432 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
433 }
434 else
435 {
436 if (filter_test == FTEST_NONE)
437 {
438 fprintf(stderr, "\nexim: %s received - message abandoned\n",
439 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
440 log_write(0, LOG_MAIN, "%s received while reading local message",
441 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
442 }
443 }
444
445 receive_bomb_out(msg); /* Does not return */
446 }
447
448
449
450 /*************************************************
451 * Add new recipient to list *
452 *************************************************/
453
454 /* This function builds a list of recipient addresses in argc/argv
455 format.
456
457 Arguments:
458 recipient the next address to add to recipients_list
459 pno parent number for fixed aliases; -1 otherwise
460
461 Returns: nothing
462 */
463
464 void
465 receive_add_recipient(uschar *recipient, int pno)
466 {
467 if (recipients_count >= recipients_list_max)
468 {
469 recipient_item *oldlist = recipients_list;
470 int oldmax = recipients_list_max;
471 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
472 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
473 if (oldlist != NULL)
474 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
475 }
476
477 recipients_list[recipients_count].address = recipient;
478 recipients_list[recipients_count].pno = pno;
479 #ifdef EXPERIMENTAL_BRIGHTMAIL
480 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
481 /* reset optin string pointer for next recipient */
482 bmi_current_optin = NULL;
483 #endif
484 recipients_list[recipients_count++].errors_to = NULL;
485 }
486
487
488
489
490 /*************************************************
491 * Remove a recipient from the list *
492 *************************************************/
493
494 /* This function is provided for local_scan() to use.
495
496 Argument:
497 recipient address to remove
498
499 Returns: TRUE if it did remove something; FALSE otherwise
500 */
501
502 BOOL
503 receive_remove_recipient(uschar *recipient)
504 {
505 int count;
506 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
507 recipient);
508 for (count = 0; count < recipients_count; count++)
509 {
510 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
511 {
512 if ((--recipients_count - count) > 0)
513 memmove(recipients_list + count, recipients_list + count + 1,
514 (recipients_count - count)*sizeof(recipient_item));
515 return TRUE;
516 }
517 }
518 return FALSE;
519 }
520
521
522
523
524
525 /*************************************************
526 * Read data portion of a non-SMTP message *
527 *************************************************/
528
529 /* This function is called to read the remainder of a message (following the
530 header) when the input is not from SMTP - we are receiving a local message on
531 a standard input stream. The message is always terminated by EOF, and is also
532 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
533 two cases for maximum efficiency.
534
535 Ensure that the body ends with a newline. This will naturally be the case when
536 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
537 as "sequences of lines" - this of course strictly applies only to SMTP, but
538 deliveries into BSD-type mailbox files also require it. Exim used to have a
539 flag for doing this at delivery time, but as it was always set for all
540 transports, I decided to simplify things by putting the check here instead.
541
542 There is at least one MUA (dtmail) that sends CRLF via this interface, and
543 other programs are known to do this as well. Exim used to have a option for
544 dealing with this: in July 2003, after much discussion, the code has been
545 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
546
547 However, for the case when a dot on a line by itself terminates a message, the
548 only recognized terminating sequences before and after the dot are LF and CRLF.
549 Otherwise, having read EOL . CR, you don't know whether to read another
550 character or not.
551
552 Internally, in messages stored in Exim's spool files, LF is used as the line
553 terminator. Under the new regime, bare CRs will no longer appear in these
554 files.
555
556 Arguments:
557 fout a FILE to which to write the message
558
559 Returns: One of the END_xxx values indicating why it stopped reading
560 */
561
562 static int
563 read_message_data(FILE *fout)
564 {
565 int ch_state;
566 register int ch;
567
568 /* Handle the case when only EOF terminates the message */
569
570 if (!dot_ends)
571 {
572 register int last_ch = '\n';
573
574 for (; (ch = (RECEIVE_GETC)()) != EOF; last_ch = ch)
575 {
576 if (ch == 0) body_zerocount++;
577 if (last_ch == '\r' && ch != '\n')
578 {
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') body_linecount++;
587 if (++message_size > thismessage_size_limit) return END_SIZE;
588 }
589
590 if (last_ch != '\n')
591 {
592 if (fputc('\n', fout) == EOF) return END_WERROR;
593 message_size++;
594 body_linecount++;
595 }
596
597 return END_EOF;
598 }
599
600 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
601
602 ch_state = 1;
603
604 while ((ch = (RECEIVE_GETC)()) != EOF)
605 {
606 if (ch == 0) body_zerocount++;
607 switch (ch_state)
608 {
609 case 0: /* Normal state (previous char written) */
610 if (ch == '\n')
611 { body_linecount++; ch_state = 1; }
612 else if (ch == '\r')
613 { ch_state = 2; continue; }
614 break;
615
616 case 1: /* After written "\n" */
617 if (ch == '.') { ch_state = 3; continue; }
618 if (ch != '\n') ch_state = 0;
619 break;
620
621 case 2:
622 body_linecount++; /* After unwritten "\r" */
623 if (ch == '\n')
624 { ch_state = 1; }
625 else
626 {
627 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
628 if (ch == '\r') continue;
629 ch_state = 0;
630 }
631 break;
632
633 case 3: /* After "\n." (\n written, dot not) */
634 if (ch == '\n') return END_DOT;
635 if (ch == '\r') { ch_state = 4; continue; }
636 message_size++;
637 if (fputc('.', fout) == EOF) return END_WERROR;
638 ch_state = 0;
639 break;
640
641 case 4: /* After "\n.\r" (\n written, rest not) */
642 if (ch == '\n') return END_DOT;
643 message_size += 2;
644 body_linecount++;
645 if (fputs(".\n", fout) == EOF) return END_WERROR;
646 if (ch == '\r') { ch_state = 2; continue; }
647 ch_state = 0;
648 break;
649 }
650
651 if (fputc(ch, fout) == EOF) return END_WERROR;
652 if (++message_size > thismessage_size_limit) return END_SIZE;
653 }
654
655 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
656 the message ends with a newline, and we must also write any characters that
657 were saved up while testing for an ending dot. */
658
659 if (ch_state != 1)
660 {
661 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
662 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
663 message_size += Ustrlen(ends[ch_state]);
664 body_linecount++;
665 }
666
667 return END_EOF;
668 }
669
670
671
672
673 /*************************************************
674 * Read data portion of an SMTP message *
675 *************************************************/
676
677 /* This function is called to read the remainder of an SMTP message (after the
678 headers), or to skip over it when an error has occurred. In this case, the
679 output file is passed as NULL.
680
681 If any line begins with a dot, that character is skipped. The input should only
682 be successfully terminated by CR LF . CR LF unless it is local (non-network)
683 SMTP, in which case the CRs are optional, but...
684
685 FUDGE: It seems that sites on the net send out messages with just LF
686 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
687 we make the CRs optional in all cases.
688
689 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
690 well, so that there are no CRs in spooled messages. However, the message
691 terminating dot is not recognized between two bare CRs.
692
693 Arguments:
694 fout a FILE to which to write the message; NULL if skipping
695
696 Returns: One of the END_xxx values indicating why it stopped reading
697 */
698
699 static int
700 read_message_data_smtp(FILE *fout)
701 {
702 int ch_state = 0;
703 register int ch;
704
705 while ((ch = (RECEIVE_GETC)()) != EOF)
706 {
707 if (ch == 0) body_zerocount++;
708 switch (ch_state)
709 {
710 case 0: /* After LF or CRLF */
711 if (ch == '.')
712 {
713 ch_state = 3;
714 continue; /* Don't ever write . after LF */
715 }
716 ch_state = 1;
717
718 /* Else fall through to handle as normal uschar. */
719
720 case 1: /* Normal state */
721 if (ch == '\n')
722 {
723 ch_state = 0;
724 body_linecount++;
725 }
726 else if (ch == '\r')
727 {
728 ch_state = 2;
729 continue;
730 }
731 break;
732
733 case 2: /* After (unwritten) CR */
734 body_linecount++;
735 if (ch == '\n')
736 {
737 ch_state = 0;
738 }
739 else
740 {
741 message_size++;
742 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
743 if (ch != '\r') ch_state = 1; else continue;
744 }
745 break;
746
747 case 3: /* After [CR] LF . */
748 if (ch == '\n')
749 return END_DOT;
750 if (ch == '\r')
751 {
752 ch_state = 4;
753 continue;
754 }
755 ch_state = 1; /* The dot itself is removed */
756 break;
757
758 case 4: /* After [CR] LF . CR */
759 if (ch == '\n') return END_DOT;
760 message_size++;
761 body_linecount++;
762 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
763 if (ch == '\r')
764 {
765 ch_state = 2;
766 continue;
767 }
768 ch_state = 1;
769 break;
770 }
771
772 /* Add the character to the spool file, unless skipping; then loop for the
773 next. */
774
775 message_size++;
776 if (fout != NULL)
777 {
778 if (fputc(ch, fout) == EOF) return END_WERROR;
779 if (message_size > thismessage_size_limit) return END_SIZE;
780 }
781 }
782
783 /* Fall through here if EOF encountered. This indicates some kind of error,
784 since a correct message is terminated by [CR] LF . [CR] LF. */
785
786 return END_EOF;
787 }
788
789
790
791
792 /*************************************************
793 * Swallow SMTP message *
794 *************************************************/
795
796 /* This function is called when there has been some kind of error while reading
797 an SMTP message, and the remaining data may need to be swallowed. It is global
798 because it is called from smtp_closedown() to shut down an incoming call
799 tidily.
800
801 Argument: a FILE from which to read the message
802 Returns: nothing
803 */
804
805 void
806 receive_swallow_smtp(void)
807 {
808 if (message_ended >= END_NOTENDED)
809 message_ended = read_message_data_smtp(NULL);
810 }
811
812
813
814 /*************************************************
815 * Handle lost SMTP connection *
816 *************************************************/
817
818 /* This function logs connection loss incidents and generates an appropriate
819 SMTP response.
820
821 Argument: additional data for the message
822 Returns: the SMTP response
823 */
824
825 static uschar *
826 handle_lost_connection(uschar *s)
827 {
828 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
829 "%s lost while reading message data%s", smtp_get_connection_info(), s);
830 return US"421 Lost incoming connection";
831 }
832
833
834
835
836 /*************************************************
837 * Handle a non-smtp reception error *
838 *************************************************/
839
840 /* This function is called for various errors during the reception of non-SMTP
841 messages. It either sends a message to the sender of the problem message, or it
842 writes to the standard error stream.
843
844 Arguments:
845 errcode code for moan_to_sender(), identifying the error
846 text1 first message text, passed to moan_to_sender()
847 text2 second message text, used only for stderrr
848 error_rc code to pass to exim_exit if no problem
849 f FILE containing body of message (may be stdin)
850 hptr pointer to instore headers or NULL
851
852 Returns: calls exim_exit(), which does not return
853 */
854
855 static void
856 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
857 FILE *f, header_line *hptr)
858 {
859 if (error_handling == ERRORS_SENDER)
860 {
861 error_block eblock;
862 eblock.next = NULL;
863 eblock.text1 = text1;
864 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
865 error_rc = EXIT_FAILURE;
866 }
867 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
868 fclose(f);
869 exim_exit(error_rc);
870 }
871
872
873
874 /*************************************************
875 * Add header lines set up by ACL *
876 *************************************************/
877
878 /* This function is called to add the header lines that were set up by "warn"
879 statements in an ACL onto the list of headers in memory. It is done in two
880 stages like this, because when the ACL for RCPT is running, the other headers
881 have not yet been received. This function is called twice; once just before
882 running the DATA ACL, and once after. This is so that header lines added by
883 MAIL or RCPT are visible to the DATA ACL.
884
885 Originally these header lines were added at the end. Now there is support for
886 three different places: top, bottom, and after the Received: header(s). There
887 will always be at least one Received: header, even if it is marked deleted, and
888 even if something else has been put in front of it.
889
890 Arguments:
891 acl_name text to identify which ACL
892
893 Returns: nothing
894 */
895
896 static void
897 add_acl_headers(uschar *acl_name)
898 {
899 header_line *h, *next;
900 header_line *last_received = NULL;
901
902 if (acl_warn_headers == NULL) return;
903 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
904
905 for (h = acl_warn_headers; h != NULL; h = next)
906 {
907 next = h->next;
908
909 switch(h->type)
910 {
911 case htype_add_top:
912 h->next = header_list;
913 header_list = h;
914 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
915 break;
916
917 case htype_add_rec:
918 if (last_received == NULL)
919 {
920 last_received = header_list;
921 while (!header_testname(last_received, US"Received", 8, FALSE))
922 last_received = last_received->next;
923 while (last_received->next != NULL &&
924 header_testname(last_received->next, US"Received", 8, FALSE))
925 last_received = last_received->next;
926 }
927 h->next = last_received->next;
928 last_received->next = h;
929 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
930 break;
931
932 case htype_add_rfc:
933 /* add header before any header which is NOT Received: or Resent- */
934 last_received = header_list;
935 while ( (last_received->next != NULL) &&
936 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
937 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
938 last_received = last_received->next;
939 /* last_received now points to the last Received: or Resent-* header
940 in an uninterrupted chain of those header types (seen from the beginning
941 of all headers. Our current header must follow it. */
942 h->next = last_received->next;
943 last_received->next = h;
944 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
945 break;
946
947 default:
948 h->next = NULL;
949 header_last->next = h;
950 break;
951 }
952
953 if (h->next == NULL) header_last = h;
954
955 /* Check for one of the known header types (From:, To:, etc.) though in
956 practice most added headers are going to be "other". Lower case
957 identification letters are never stored with the header; they are used
958 for existence tests when messages are received. So discard any lower case
959 flag values. */
960
961 h->type = header_checkname(h, FALSE);
962 if (h->type >= 'a') h->type = htype_other;
963
964 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
965 }
966
967 acl_warn_headers = NULL;
968 DEBUG(D_receive|D_acl) debug_printf(">>\n");
969 }
970
971
972
973 /*************************************************
974 * Add host information for log line *
975 *************************************************/
976
977 /* Called for acceptance and rejecting log lines. This adds information about
978 the calling host to a string that is being built dynamically.
979
980 Arguments:
981 s the dynamic string
982 sizeptr points to the size variable
983 ptrptr points to the pointer variable
984
985 Returns: the extended string
986 */
987
988 static uschar *
989 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
990 {
991 if (sender_fullhost != NULL)
992 {
993 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
994 if ((log_extra_selector & LX_incoming_interface) != 0 &&
995 interface_address != NULL)
996 {
997 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
998 interface_port);
999 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1000 }
1001 }
1002 if (sender_ident != NULL)
1003 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1004 if (received_protocol != NULL)
1005 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1006 return s;
1007 }
1008
1009
1010
1011
1012 /*************************************************
1013 * Run the MIME ACL on a message *
1014 *************************************************/
1015
1016 /* This code is in a subroutine so that it can be used for both SMTP
1017 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1018
1019 Arguments:
1020 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1021 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1022 smtp_reply_ptr Where SMTP reply is being built
1023 blackholed_by_ptr Where "blackholed by" message is being built
1024
1025 Returns: TRUE to carry on; FALSE to abandon the message
1026 */
1027
1028 static BOOL
1029 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1030 uschar **blackholed_by_ptr)
1031 {
1032 FILE *mbox_file;
1033 uschar rfc822_file_path[2048];
1034 unsigned long mbox_size;
1035 header_line *my_headerlist;
1036 uschar *user_msg, *log_msg;
1037 int mime_part_count_buffer = -1;
1038 int rc;
1039
1040 memset(CS rfc822_file_path,0,2048);
1041
1042 /* check if it is a MIME message */
1043 my_headerlist = header_list;
1044 while (my_headerlist != NULL) {
1045 /* skip deleted headers */
1046 if (my_headerlist->type == '*') {
1047 my_headerlist = my_headerlist->next;
1048 continue;
1049 };
1050 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0) {
1051 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1052 goto DO_MIME_ACL;
1053 };
1054 my_headerlist = my_headerlist->next;
1055 };
1056
1057 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1058 return TRUE;
1059
1060 DO_MIME_ACL:
1061 /* make sure the eml mbox file is spooled up */
1062 mbox_file = spool_mbox(&mbox_size);
1063 if (mbox_file == NULL) {
1064 /* error while spooling */
1065 log_write(0, LOG_MAIN|LOG_PANIC,
1066 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1067 Uunlink(spool_name);
1068 unspool_mbox();
1069 smtp_respond(451, TRUE, US"temporary local problem");
1070 message_id[0] = 0; /* Indicate no message accepted */
1071 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1072 return FALSE; /* Indicate skip to end of receive function */
1073 };
1074
1075 mime_is_rfc822 = 0;
1076
1077 MIME_ACL_CHECK:
1078 mime_part_count = -1;
1079 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1080 fclose(mbox_file);
1081
1082 if (Ustrlen(rfc822_file_path) > 0) {
1083 mime_part_count = mime_part_count_buffer;
1084
1085 if (unlink(CS rfc822_file_path) == -1) {
1086 log_write(0, LOG_PANIC,
1087 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1088 goto END_MIME_ACL;
1089 };
1090 };
1091
1092 /* check if we must check any message/rfc822 attachments */
1093 if (rc == OK) {
1094 uschar temp_path[1024];
1095 int n;
1096 struct dirent *entry;
1097 DIR *tempdir;
1098
1099 snprintf(CS temp_path, 1024, "%s/scan/%s", spool_directory, message_id);
1100
1101 tempdir = opendir(CS temp_path);
1102 n = 0;
1103 do {
1104 entry = readdir(tempdir);
1105 if (entry == NULL) break;
1106 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0) {
1107 snprintf(CS rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1108 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1109 break;
1110 };
1111 } while (1);
1112 closedir(tempdir);
1113
1114 if (entry != NULL) {
1115 mbox_file = Ufopen(rfc822_file_path,"r");
1116 if (mbox_file == NULL) {
1117 log_write(0, LOG_PANIC,
1118 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1119 unlink(CS rfc822_file_path);
1120 goto END_MIME_ACL;
1121 };
1122 /* set RFC822 expansion variable */
1123 mime_is_rfc822 = 1;
1124 mime_part_count_buffer = mime_part_count;
1125 goto MIME_ACL_CHECK;
1126 };
1127 };
1128
1129 END_MIME_ACL:
1130 add_acl_headers(US"MIME");
1131 if (rc == DISCARD)
1132 {
1133 recipients_count = 0;
1134 *blackholed_by_ptr = US"MIME ACL";
1135 }
1136 else if (rc != OK)
1137 {
1138 Uunlink(spool_name);
1139 unspool_mbox();
1140 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1141 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1142 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1143 message_id[0] = 0; /* Indicate no message accepted */
1144 return FALSE; /* Cause skip to end of receive function */
1145 };
1146
1147 return TRUE;
1148 }
1149
1150
1151
1152 /*************************************************
1153 * Receive message *
1154 *************************************************/
1155
1156 /* Receive a message on the given input, and put it into a pair of spool files.
1157 Either a non-null list of recipients, or the extract flag will be true, or
1158 both. The flag sender_local is true for locally generated messages. The flag
1159 submission_mode is true if an ACL has obeyed "control = submission". The flag
1160 smtp_input is true if the message is to be handled using SMTP conventions about
1161 termination and lines starting with dots. For non-SMTP messages, dot_ends is
1162 true for dot-terminated messages.
1163
1164 If a message was successfully read, message_id[0] will be non-zero.
1165
1166 The general actions of this function are:
1167
1168 . Read the headers of the message (if any) into a chain of store
1169 blocks.
1170
1171 . If there is a "sender:" header and the message is locally originated,
1172 throw it away, unless the caller is trusted, or unless
1173 active_local_sender_retain is set - which can only happen if
1174 active_local_from_check is false.
1175
1176 . If recipients are to be extracted from the message, build the
1177 recipients list from the headers, removing any that were on the
1178 original recipients list (unless extract_addresses_remove_arguments is
1179 false), and at the same time, remove any bcc header that may be present.
1180
1181 . Get the spool file for the data, sort out its unique name, open
1182 and lock it (but don't give it the name yet).
1183
1184 . Generate a "Message-Id" header if the message doesn't have one, for
1185 locally-originated messages.
1186
1187 . Generate a "Received" header.
1188
1189 . Ensure the recipients list is fully qualified and rewritten if necessary.
1190
1191 . If there are any rewriting rules, apply them to the sender address
1192 and also to the headers.
1193
1194 . If there is no from: header, generate one, for locally-generated messages
1195 and messages in "submission mode" only.
1196
1197 . If the sender is local, check that from: is correct, and if not, generate
1198 a Sender: header, unless message comes from a trusted caller, or this
1199 feature is disabled by active_local_from_check being false.
1200
1201 . If there is no "date" header, generate one, for locally-originated
1202 or submission mode messages only.
1203
1204 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1205 dot_ends mode, to the data file. Leave it open, to hold the lock.
1206
1207 . Write the envelope and the headers to a new file.
1208
1209 . Set the name for the header file; close it.
1210
1211 . Set the name for the data file; close it.
1212
1213 Because this function can potentially be called many times in a single
1214 SMTP connection, all store should be got by store_get(), so that it will be
1215 automatically retrieved after the message is accepted.
1216
1217 FUDGE: It seems that sites on the net send out messages with just LF
1218 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1219 we make the CRs optional in all cases.
1220
1221 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1222 new regime is now in place in which bare CRs in header lines are turned into LF
1223 followed by a space, so as not to terminate the header line.
1224
1225 February 2004: A bare LF in a header line in a message whose first line was
1226 terminated by CRLF is treated in the same way as a bare CR.
1227
1228 Arguments:
1229 extract_recip TRUE if recipients are to be extracted from the message's
1230 headers
1231
1232 Returns: TRUE there are more messages to be read (SMTP input)
1233 FALSE there are no more messages to be read (non-SMTP input
1234 or SMTP connection collapsed, or other failure)
1235
1236 When reading a message for filter testing, the returned value indicates
1237 whether the headers (which is all that is read) were terminated by '.' or
1238 not. */
1239
1240 BOOL
1241 receive_msg(BOOL extract_recip)
1242 {
1243 int i, rc;
1244 int msg_size = 0;
1245 int process_info_len = Ustrlen(process_info);
1246 int error_rc = (error_handling == ERRORS_SENDER)?
1247 errors_sender_rc : EXIT_FAILURE;
1248 int header_size = 256;
1249 int start, end, domain, size, sptr;
1250 int id_resolution;
1251 int had_zero = 0;
1252
1253 register int ptr = 0;
1254
1255 BOOL contains_resent_headers = FALSE;
1256 BOOL extracted_ignored = FALSE;
1257 BOOL first_line_ended_crlf = TRUE_UNSET;
1258 BOOL smtp_yield = TRUE;
1259 BOOL yield = FALSE;
1260
1261 BOOL resents_exist = FALSE;
1262 uschar *resent_prefix = US"";
1263 uschar *blackholed_by = NULL;
1264 uschar *blackhole_log_msg = US"";
1265
1266 flock_t lock_data;
1267 error_block *bad_addresses = NULL;
1268
1269 uschar *frozen_by = NULL;
1270 uschar *queued_by = NULL;
1271
1272 uschar *errmsg, *s;
1273 struct stat statbuf;
1274
1275 /* Final message to give to SMTP caller */
1276
1277 uschar *smtp_reply = NULL;
1278
1279 /* Working header pointers */
1280
1281 header_line *h, *next;
1282
1283 /* Flags for noting the existence of certain headers */
1284
1285 /**** No longer check for these (Nov 2003)
1286 BOOL to_or_cc_header_exists = FALSE;
1287 BOOL bcc_header_exists = FALSE;
1288 ****/
1289
1290 BOOL date_header_exists = FALSE;
1291
1292 /* Pointers to receive the addresses of headers whose contents we need. */
1293
1294 header_line *from_header = NULL;
1295 header_line *subject_header = NULL;
1296 header_line *msgid_header = NULL;
1297 header_line *received_header;
1298
1299 /* Variables for use when building the Received: header. */
1300
1301 uschar *received;
1302 uschar *timestamp;
1303 int tslen;
1304
1305 /* Release any open files that might have been cached while preparing to
1306 accept the message - e.g. by verifying addresses - because reading a message
1307 might take a fair bit of real time. */
1308
1309 search_tidyup();
1310
1311 /* Initialize the chain of headers by setting up a place-holder for Received:
1312 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1313 pointing to the end of the chain to make adding headers simple. */
1314
1315 received_header = header_list = header_last = store_get(sizeof(header_line));
1316 header_list->next = NULL;
1317 header_list->type = htype_old;
1318 header_list->text = NULL;
1319 header_list->slen = 0;
1320
1321 /* Control block for the next header to be read. */
1322
1323 next = store_get(sizeof(header_line));
1324 next->text = store_get(header_size);
1325
1326 /* Initialize message id to be null (indicating no message read), and the
1327 header names list to be the normal list. Indicate there is no data file open
1328 yet, initialize the size and warning count, and deal with no size limit. */
1329
1330 message_id[0] = 0;
1331 data_file = NULL;
1332 data_fd = -1;
1333 spool_name[0] = 0;
1334 message_size = 0;
1335 warning_count = 0;
1336 received_count = 1; /* For the one we will add */
1337
1338 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1339
1340 /* While reading the message, body_linecount and body_zerocount is computed.
1341 The full message_ linecount is set up only when the headers are read back in
1342 from the spool for delivery. */
1343
1344 body_linecount = body_zerocount = 0;
1345
1346 #ifdef EXPERIMENTAL_DOMAINKEYS
1347 /* Call into DK to set up the context. Check if DK is to be run are carried out
1348 inside dk_exim_verify_init(). */
1349 dk_exim_verify_init();
1350 #endif
1351
1352 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1353 ids, and fractions of a second are required. See the comments that precede the
1354 message id creation below. */
1355
1356 (void)gettimeofday(&message_id_tv, NULL);
1357
1358 /* For other uses of the received time we can operate with granularity of one
1359 second, and for that we use the global variable received_time. This is for
1360 things like ultimate message timeouts. */
1361
1362 received_time = message_id_tv.tv_sec;
1363
1364 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1365 happen in the smtp_getc() function when it refills its buffer. */
1366
1367 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1368
1369 /* If not SMTP input, timeout happens only if configured, and we just set a
1370 single timeout for the whole message. */
1371
1372 else if (receive_timeout > 0)
1373 {
1374 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1375 alarm(receive_timeout);
1376 }
1377
1378 /* SIGTERM and SIGINT are caught always. */
1379
1380 signal(SIGTERM, data_sigterm_sigint_handler);
1381 signal(SIGINT, data_sigterm_sigint_handler);
1382
1383 /* Header lines in messages are not supposed to be very long, though when
1384 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1385 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1386 storing the header, and extend this as necessary using string_cat().
1387
1388 To cope with total lunacies, impose an upper limit on the length of the header
1389 section of the message, as otherwise the store will fill up. We must also cope
1390 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1391 Folded header lines are joined into one string, leaving the '\n' characters
1392 inside them, so that writing them out reproduces the input.
1393
1394 Loop for each character of each header; the next structure for chaining the
1395 header is set up already, with ptr the offset of the next character in
1396 next->text. */
1397
1398 for (;;)
1399 {
1400 int ch = (RECEIVE_GETC)();
1401
1402 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1403 SMTP must have a correct "." terminator. */
1404
1405 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1406 {
1407 smtp_reply = handle_lost_connection(US" (header)");
1408 smtp_yield = FALSE;
1409 goto TIDYUP; /* Skip to end of function */
1410 }
1411
1412 /* See if we are at the current header's size limit - there must be at least
1413 four bytes left. This allows for the new character plus a zero, plus two for
1414 extra insertions when we are playing games with dots and carriage returns. If
1415 we are at the limit, extend the text buffer. This could have been done
1416 automatically using string_cat() but because this is a tightish loop storing
1417 only one character at a time, we choose to do it inline. Normally
1418 store_extend() will be able to extend the block; only at the end of a big
1419 store block will a copy be needed. To handle the case of very long headers
1420 (and sometimes lunatic messages can have ones that are 100s of K long) we
1421 call store_release() for strings that have been copied - if the string is at
1422 the start of a block (and therefore the only thing in it, because we aren't
1423 doing any other gets), the block gets freed. We can only do this because we
1424 know there are no other calls to store_get() going on. */
1425
1426 if (ptr >= header_size - 4)
1427 {
1428 int oldsize = header_size;
1429 /* header_size += 256; */
1430 header_size *= 2;
1431 if (!store_extend(next->text, oldsize, header_size))
1432 {
1433 uschar *newtext = store_get(header_size);
1434 memcpy(newtext, next->text, ptr);
1435 store_release(next->text);
1436 next->text = newtext;
1437 }
1438 }
1439
1440 /* Cope with receiving a binary zero. There is dispute about whether
1441 these should be allowed in RFC 822 messages. The middle view is that they
1442 should not be allowed in headers, at least. Exim takes this attitude at
1443 the moment. We can't just stomp on them here, because we don't know that
1444 this line is a header yet. Set a flag to cause scanning later. */
1445
1446 if (ch == 0) had_zero++;
1447
1448 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1449 those from data files use just LF. Treat LF in local SMTP input as a
1450 terminator too. Treat EOF as a line terminator always. */
1451
1452 if (ch == EOF) goto EOL;
1453
1454 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1455 other MTAs accept this. We are therefore forced into this "liberalisation"
1456 too, so we accept LF as a line terminator whatever the source of the message.
1457 However, if the first line of the message ended with a CRLF, we treat a bare
1458 LF specially by inserting a white space after it to ensure that the header
1459 line is not terminated. */
1460
1461 if (ch == '\n')
1462 {
1463 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1464 else if (first_line_ended_crlf) RECEIVE_UNGETC(' ');
1465 goto EOL;
1466 }
1467
1468 /* This is not the end of the line. If this is SMTP input and this is
1469 the first character in the line and it is a "." character, ignore it.
1470 This implements the dot-doubling rule, though header lines starting with
1471 dots aren't exactly common. They are legal in RFC 822, though. If the
1472 following is CRLF or LF, this is the line that that terminates the
1473 entire message. We set message_ended to indicate this has happened (to
1474 prevent further reading), and break out of the loop, having freed the
1475 empty header, and set next = NULL to indicate no data line. */
1476
1477 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1478 {
1479 ch = (RECEIVE_GETC)();
1480 if (ch == '\r')
1481 {
1482 ch = (RECEIVE_GETC)();
1483 if (ch != '\n')
1484 {
1485 RECEIVE_UNGETC(ch);
1486 ch = '\r'; /* Revert to CR */
1487 }
1488 }
1489 if (ch == '\n')
1490 {
1491 message_ended = END_DOT;
1492 store_reset(next);
1493 next = NULL;
1494 break; /* End character-reading loop */
1495 }
1496
1497 /* For non-SMTP input, the dot at the start of the line was really a data
1498 character. What is now in ch is the following character. We guaranteed
1499 enough space for this above. */
1500
1501 if (!smtp_input)
1502 {
1503 next->text[ptr++] = '.';
1504 message_size++;
1505 }
1506 }
1507
1508 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1509 remember this case if this is the first line ending. */
1510
1511 if (ch == '\r')
1512 {
1513 ch = (RECEIVE_GETC)();
1514 if (ch == '\n')
1515 {
1516 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1517 goto EOL;
1518 }
1519
1520 /* Otherwise, put back the character after CR, and turn the bare CR
1521 into LF SP. */
1522
1523 ch = (RECEIVE_UNGETC)(ch);
1524 next->text[ptr++] = '\n';
1525 message_size++;
1526 ch = ' ';
1527 }
1528
1529 /* We have a data character for the header line. */
1530
1531 next->text[ptr++] = ch; /* Add to buffer */
1532 message_size++; /* Total message size so far */
1533
1534 /* Handle failure due to a humungously long header section. The >= allows
1535 for the terminating \n. Add what we have so far onto the headers list so
1536 that it gets reflected in any error message, and back up the just-read
1537 character. */
1538
1539 if (message_size >= header_maxsize)
1540 {
1541 next->text[ptr] = 0;
1542 next->slen = ptr;
1543 next->type = htype_other;
1544 next->next = NULL;
1545 header_last->next = next;
1546 header_last = next;
1547
1548 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1549 "%s (more than %d characters): message abandoned",
1550 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1551
1552 if (smtp_input)
1553 {
1554 smtp_reply = US"552 Message header is ridiculously long";
1555 receive_swallow_smtp();
1556 goto TIDYUP; /* Skip to end of function */
1557 }
1558
1559 else
1560 {
1561 give_local_error(ERRMESS_VLONGHEADER,
1562 string_sprintf("message header longer than %d characters received: "
1563 "message not accepted", header_maxsize), US"", error_rc, stdin,
1564 header_list->next);
1565 /* Does not return */
1566 }
1567 }
1568
1569 continue; /* With next input character */
1570
1571 /* End of header line reached */
1572
1573 EOL:
1574 receive_linecount++; /* For BSMTP errors */
1575
1576 /* Now put in the terminating newline. There is always space for
1577 at least two more characters. */
1578
1579 next->text[ptr++] = '\n';
1580 message_size++;
1581
1582 /* A blank line signals the end of the headers; release the unwanted
1583 space and set next to NULL to indicate this. */
1584
1585 if (ptr == 1)
1586 {
1587 store_reset(next);
1588 next = NULL;
1589 break;
1590 }
1591
1592 /* There is data in the line; see if the next input character is a
1593 whitespace character. If it is, we have a continuation of this header line.
1594 There is always space for at least one character at this point. */
1595
1596 if (ch != EOF)
1597 {
1598 int nextch = (RECEIVE_GETC)();
1599 if (nextch == ' ' || nextch == '\t')
1600 {
1601 next->text[ptr++] = nextch;
1602 message_size++;
1603 continue; /* Iterate the loop */
1604 }
1605 else if (nextch != EOF) (RECEIVE_UNGETC)(nextch); /* For next time */
1606 else ch = EOF; /* Cause main loop to exit at end */
1607 }
1608
1609 /* We have got to the real line end. Terminate the string and release store
1610 beyond it. If it turns out to be a real header, internal binary zeros will
1611 be squashed later. */
1612
1613 next->text[ptr] = 0;
1614 next->slen = ptr;
1615 store_reset(next->text + ptr + 1);
1616
1617 /* Check the running total size against the overall message size limit. We
1618 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1619 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1620 headers - the code to read the body will then also hit the buffer. */
1621
1622 if (message_size > thismessage_size_limit) break;
1623
1624 /* A line that is not syntactically correct for a header also marks
1625 the end of the headers. In this case, we leave next containing the
1626 first data line. This might actually be several lines because of the
1627 continuation logic applied above, but that doesn't matter.
1628
1629 It turns out that smail, and presumably sendmail, accept leading lines
1630 of the form
1631
1632 From ph10 Fri Jan 5 12:35 GMT 1996
1633
1634 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1635 find any documentation of this, but for compatibility it had better be
1636 accepted. Exim restricts it to the case of non-smtp messages, and
1637 treats it as an alternative to the -f command line option. Thus it is
1638 ignored except for trusted users or filter testing. Otherwise it is taken
1639 as the sender address, unless -f was used (sendmail compatibility).
1640
1641 It further turns out that some UUCPs generate the From_line in a different
1642 format, e.g.
1643
1644 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1645
1646 The regex for matching these things is now capable of recognizing both
1647 formats (including 2- and 4-digit years in the latter). In fact, the regex
1648 is now configurable, as is the expansion string to fish out the sender.
1649
1650 Even further on it has been discovered that some broken clients send
1651 these lines in SMTP messages. There is now an option to ignore them from
1652 specified hosts or networks. Sigh. */
1653
1654 if (header_last == header_list &&
1655 (!smtp_input
1656 ||
1657 (sender_host_address != NULL &&
1658 verify_check_host(&ignore_fromline_hosts) == OK)
1659 ||
1660 (sender_host_address == NULL && ignore_fromline_local)
1661 ) &&
1662 regex_match_and_setup(regex_From, next->text, 0, -1))
1663 {
1664 if (!sender_address_forced)
1665 {
1666 uschar *uucp_sender = expand_string(uucp_from_sender);
1667 if (uucp_sender == NULL)
1668 {
1669 log_write(0, LOG_MAIN|LOG_PANIC,
1670 "expansion of \"%s\" failed after matching "
1671 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1672 }
1673 else
1674 {
1675 int start, end, domain;
1676 uschar *errmess;
1677 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1678 &start, &end, &domain, TRUE);
1679 if (newsender != NULL)
1680 {
1681 if (domain == 0 && newsender[0] != 0)
1682 newsender = rewrite_address_qualify(newsender, FALSE);
1683
1684 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1685 {
1686 sender_address = newsender;
1687
1688 if (trusted_caller || filter_test != FTEST_NONE)
1689 {
1690 authenticated_sender = NULL;
1691 originator_name = US"";
1692 sender_local = FALSE;
1693 }
1694
1695 if (filter_test != FTEST_NONE)
1696 printf("Sender taken from \"From \" line\n");
1697 }
1698 }
1699 }
1700 }
1701 }
1702
1703 /* Not a leading "From " line. Check to see if it is a valid header line.
1704 Header names may contain any non-control characters except space and colon,
1705 amazingly. */
1706
1707 else
1708 {
1709 uschar *p = next->text;
1710
1711 /* If not a valid header line, break from the header reading loop, leaving
1712 next != NULL, indicating that it holds the first line of the body. */
1713
1714 if (isspace(*p)) break;
1715 while (mac_isgraph(*p) && *p != ':') p++;
1716 while (isspace(*p)) p++;
1717 if (*p != ':')
1718 {
1719 body_zerocount = had_zero;
1720 break;
1721 }
1722
1723 /* We have a valid header line. If there were any binary zeroes in
1724 the line, stomp on them here. */
1725
1726 if (had_zero > 0)
1727 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1728
1729 /* It is perfectly legal to have an empty continuation line
1730 at the end of a header, but it is confusing to humans
1731 looking at such messages, since it looks like a blank line.
1732 Reduce confusion by removing redundant white space at the
1733 end. We know that there is at least one printing character
1734 (the ':' tested for above) so there is no danger of running
1735 off the end. */
1736
1737 p = next->text + ptr - 2;
1738 for (;;)
1739 {
1740 while (*p == ' ' || *p == '\t') p--;
1741 if (*p != '\n') break;
1742 ptr = (p--) - next->text + 1;
1743 message_size -= next->slen - ptr;
1744 next->text[ptr] = 0;
1745 next->slen = ptr;
1746 }
1747
1748 /* Add the header to the chain */
1749
1750 next->type = htype_other;
1751 next->next = NULL;
1752 header_last->next = next;
1753 header_last = next;
1754
1755 /* Check the limit for individual line lengths. This comes after adding to
1756 the chain so that the failing line is reflected if a bounce is generated
1757 (for a local message). */
1758
1759 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1760 {
1761 log_write(0, LOG_MAIN, "overlong message header line received from "
1762 "%s (more than %d characters): message abandoned",
1763 sender_host_unknown? sender_ident : sender_fullhost,
1764 header_line_maxsize);
1765
1766 if (smtp_input)
1767 {
1768 smtp_reply = US"552 A message header line is too long";
1769 receive_swallow_smtp();
1770 goto TIDYUP; /* Skip to end of function */
1771 }
1772
1773 else
1774 {
1775 give_local_error(ERRMESS_VLONGHDRLINE,
1776 string_sprintf("message header line longer than %d characters "
1777 "received: message not accepted", header_line_maxsize), US"",
1778 error_rc, stdin, header_list->next);
1779 /* Does not return */
1780 }
1781 }
1782
1783 /* Note if any resent- fields exist. */
1784
1785 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1786 {
1787 resents_exist = TRUE;
1788 resent_prefix = US"Resent-";
1789 }
1790 }
1791
1792 /* The line has been handled. If we have hit EOF, break out of the loop,
1793 indicating no pending data line. */
1794
1795 if (ch == EOF) { next = NULL; break; }
1796
1797 /* Set up for the next header */
1798
1799 header_size = 256;
1800 next = store_get(sizeof(header_line));
1801 next->text = store_get(header_size);
1802 ptr = 0;
1803 had_zero = 0;
1804 } /* Continue, starting to read the next header */
1805
1806 /* At this point, we have read all the headers into a data structure in main
1807 store. The first header is still the dummy placeholder for the Received: header
1808 we are going to generate a bit later on. If next != NULL, it contains the first
1809 data line - which terminated the headers before reaching a blank line (not the
1810 normal case). */
1811
1812 DEBUG(D_receive)
1813 {
1814 debug_printf(">>Headers received:\n");
1815 for (h = header_list->next; h != NULL; h = h->next)
1816 debug_printf("%s", h->text);
1817 debug_printf("\n");
1818 }
1819
1820 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1821 is dropped immediately after valid headers, the next thing we will see is EOF.
1822 We must test for this specially, as further down the reading of the data is
1823 skipped if already at EOF. */
1824
1825 if (smtp_input && (receive_feof)())
1826 {
1827 smtp_reply = handle_lost_connection(US" (after header)");
1828 smtp_yield = FALSE;
1829 goto TIDYUP; /* Skip to end of function */
1830 }
1831
1832 /* If this is a filter test run and no headers were read, output a warning
1833 in case there is a mistake in the test message. */
1834
1835 if (filter_test != FTEST_NONE && header_list->next == NULL)
1836 printf("Warning: no message headers read\n");
1837
1838
1839 /* Scan the headers to identify them. Some are merely marked for later
1840 processing; some are dealt with here. */
1841
1842 for (h = header_list->next; h != NULL; h = h->next)
1843 {
1844 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1845 if (is_resent) contains_resent_headers = TRUE;
1846
1847 switch (header_checkname(h, is_resent))
1848 {
1849 /* "Bcc:" gets flagged, and its existence noted, whether it's resent- or
1850 not. */
1851
1852 case htype_bcc:
1853 h->type = htype_bcc;
1854 /****
1855 bcc_header_exists = TRUE;
1856 ****/
1857 break;
1858
1859 /* "Cc:" gets flagged, and the existence of a recipient header is noted,
1860 whether it's resent- or not. */
1861
1862 case htype_cc:
1863 h->type = htype_cc;
1864 /****
1865 to_or_cc_header_exists = TRUE;
1866 ****/
1867 break;
1868
1869 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1870
1871 case htype_date:
1872 date_header_exists = !resents_exist || is_resent;
1873 break;
1874
1875 /* Same comments as about Return-Path: below. */
1876
1877 case htype_delivery_date:
1878 if (delivery_date_remove) h->type = htype_old;
1879 break;
1880
1881 /* Same comments as about Return-Path: below. */
1882
1883 case htype_envelope_to:
1884 if (envelope_to_remove) h->type = htype_old;
1885 break;
1886
1887 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1888 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1889 header consists of just the login id of the user who called Exim, rewrite
1890 it with the gecos field first. Apply this rule to Resent-From: if there
1891 are resent- fields. */
1892
1893 case htype_from:
1894 h->type = htype_from;
1895 if (!resents_exist || is_resent)
1896 {
1897 from_header = h;
1898 if (!smtp_input)
1899 {
1900 uschar *s = Ustrchr(h->text, ':') + 1;
1901 while (isspace(*s)) s++;
1902 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1903 {
1904 uschar *name = is_resent? US"Resent-From" : US"From";
1905 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1906 originator_login, qualify_domain_sender);
1907 from_header = header_last;
1908 h->type = htype_old;
1909 DEBUG(D_receive|D_rewrite)
1910 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1911 }
1912 }
1913 }
1914 break;
1915
1916 /* Identify the Message-id: header for generating "in-reply-to" in the
1917 autoreply transport. For incoming logging, save any resent- value. In both
1918 cases, take just the first of any multiples. */
1919
1920 case htype_id:
1921 if (msgid_header == NULL && (!resents_exist || is_resent))
1922 {
1923 msgid_header = h;
1924 h->type = htype_id;
1925 }
1926 break;
1927
1928 /* Flag all Received: headers */
1929
1930 case htype_received:
1931 h->type = htype_received;
1932 received_count++;
1933 break;
1934
1935 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1936
1937 case htype_reply_to:
1938 h->type = htype_reply_to;
1939 break;
1940
1941 /* The Return-path: header is supposed to be added to messages when
1942 they leave the SMTP system. We shouldn't receive messages that already
1943 contain Return-path. However, since Exim generates Return-path: on
1944 local delivery, resent messages may well contain it. We therefore
1945 provide an option (which defaults on) to remove any Return-path: headers
1946 on input. Removal actually means flagging as "old", which prevents the
1947 header being transmitted with the message. */
1948
1949 case htype_return_path:
1950 if (return_path_remove) h->type = htype_old;
1951
1952 /* If we are testing a mail filter file, use the value of the
1953 Return-Path: header to set up the return_path variable, which is not
1954 otherwise set. However, remove any <> that surround the address
1955 because the variable doesn't have these. */
1956
1957 if (filter_test != FTEST_NONE)
1958 {
1959 uschar *start = h->text + 12;
1960 uschar *end = start + Ustrlen(start);
1961 while (isspace(*start)) start++;
1962 while (end > start && isspace(end[-1])) end--;
1963 if (*start == '<' && end[-1] == '>')
1964 {
1965 start++;
1966 end--;
1967 }
1968 return_path = string_copyn(start, end - start);
1969 printf("Return-path taken from \"Return-path:\" header line\n");
1970 }
1971 break;
1972
1973 /* If there is a "Sender:" header and the message is locally originated,
1974 and from an untrusted caller, or if we are in submission mode for a remote
1975 message, mark it "old" so that it will not be transmitted with the message,
1976 unless active_local_sender_retain is set. (This can only be true if
1977 active_local_from_check is false.) If there are any resent- headers in the
1978 message, apply this rule to Resent-Sender: instead of Sender:. Messages
1979 with multiple resent- header sets cannot be tidily handled. (For this
1980 reason, at least one MUA - Pine - turns old resent- headers into X-resent-
1981 headers when resending, leaving just one set.) */
1982
1983 case htype_sender:
1984 h->type = ((!active_local_sender_retain &&
1985 ((sender_local && !trusted_caller) || submission_mode)
1986 ) &&
1987 (!resents_exist||is_resent))?
1988 htype_old : htype_sender;
1989 break;
1990
1991 /* Remember the Subject: header for logging. There is no Resent-Subject */
1992
1993 case htype_subject:
1994 subject_header = h;
1995 break;
1996
1997 /* "To:" gets flagged, and the existence of a recipient header is noted,
1998 whether it's resent- or not. */
1999
2000 case htype_to:
2001 h->type = htype_to;
2002 /****
2003 to_or_cc_header_exists = TRUE;
2004 ****/
2005 break;
2006 }
2007 }
2008
2009 /* Extract recipients from the headers if that is required (the -t option).
2010 Note that this is documented as being done *before* any address rewriting takes
2011 place. There are two possibilities:
2012
2013 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2014 recipients already listed are to be REMOVED from the message. Smail 3 works
2015 like this. We need to build a non-recipients tree for that list, because in
2016 subsequent processing this data is held in a tree and that's what the
2017 spool_write_header() function expects. Make sure that non-recipient addresses
2018 are fully qualified and rewritten if necessary.
2019
2020 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2021 those in the command line arguments (and it is rumoured some other MTAs do
2022 this). Therefore, there is an option to make Exim behave this way.
2023
2024 *** Notes on "Resent-" header lines ***
2025
2026 The presence of resent-headers in the message makes -t horribly ambiguous.
2027 Experiments with sendmail showed that it uses recipients for all resent-
2028 headers, totally ignoring the concept of "sets of resent- headers" as described
2029 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2030 with all the addresses in one instance of each header.
2031
2032 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2033 error for -t if there were resent- headers in the message. However, after a
2034 discussion on the mailing list, I've learned that there are MUAs that use
2035 resent- headers with -t, and also that the stuff about sets of resent- headers
2036 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2037 message with -t and resent- header lines makes sure that only *its* resent-
2038 headers are present; previous ones are often renamed as X-resent- for example.
2039
2040 Consequently, Exim has been changed so that, if any resent- header lines are
2041 present, the recipients are taken from all of the appropriate resent- lines,
2042 and not from the ordinary To:, Cc:, etc. */
2043
2044 if (extract_recip)
2045 {
2046 int rcount = 0;
2047 error_block **bnext = &bad_addresses;
2048
2049 if (extract_addresses_remove_arguments)
2050 {
2051 while (recipients_count-- > 0)
2052 {
2053 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2054 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2055 tree_add_nonrecipient(s);
2056 }
2057 recipients_list = NULL;
2058 recipients_count = recipients_list_max = 0;
2059 }
2060
2061 parse_allow_group = TRUE; /* Allow address group syntax */
2062
2063 /* Now scan the headers */
2064
2065 for (h = header_list->next; h != NULL; h = h->next)
2066 {
2067 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2068 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2069 {
2070 uschar *s = Ustrchr(h->text, ':') + 1;
2071 while (isspace(*s)) s++;
2072
2073 while (*s != 0)
2074 {
2075 uschar *ss = parse_find_address_end(s, FALSE);
2076 uschar *recipient, *errmess, *p, *pp;
2077 int start, end, domain;
2078
2079 /* Check on maximum */
2080
2081 if (recipients_max > 0 && ++rcount > recipients_max)
2082 {
2083 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2084 US"message rejected: ", error_rc, stdin, NULL);
2085 /* Does not return */
2086 }
2087
2088 /* Make a copy of the address, and remove any internal newlines. These
2089 may be present as a result of continuations of the header line. The
2090 white space that follows the newline must not be removed - it is part
2091 of the header. */
2092
2093 pp = recipient = store_get(ss - s + 1);
2094 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2095 *pp = 0;
2096 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2097 &domain, FALSE);
2098
2099 /* Keep a list of all the bad addresses so we can send a single
2100 error message at the end. However, an empty address is not an error;
2101 just ignore it. This can come from an empty group list like
2102
2103 To: Recipients of list:;
2104
2105 If there are no recipients at all, an error will occur later. */
2106
2107 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2108 {
2109 int len = Ustrlen(s);
2110 error_block *b = store_get(sizeof(error_block));
2111 while (len > 0 && isspace(s[len-1])) len--;
2112 b->next = NULL;
2113 b->text1 = string_printing(string_copyn(s, len));
2114 b->text2 = errmess;
2115 *bnext = b;
2116 bnext = &(b->next);
2117 }
2118
2119 /* If the recipient is already in the nonrecipients tree, it must
2120 have appeared on the command line with the option extract_addresses_
2121 remove_arguments set. Do not add it to the recipients, and keep a note
2122 that this has happened, in order to give a better error if there are
2123 no recipients left. */
2124
2125 else if (recipient != NULL)
2126 {
2127 if (tree_search(tree_nonrecipients, recipient) == NULL)
2128 receive_add_recipient(recipient, -1);
2129 else
2130 extracted_ignored = TRUE;
2131 }
2132
2133 /* Move on past this address */
2134
2135 s = ss + (*ss? 1:0);
2136 while (isspace(*s)) s++;
2137 }
2138
2139 /* If this was the bcc: header, mark it "old", which means it
2140 will be kept on the spool, but not transmitted as part of the
2141 message. */
2142
2143 if (h->type == htype_bcc)
2144 {
2145 h->type = htype_old;
2146 /****
2147 bcc_header_exists = FALSE;
2148 ****/
2149 }
2150 } /* For appropriate header line */
2151 } /* For each header line */
2152
2153 parse_allow_group = FALSE; /* Reset group syntax flags */
2154 parse_found_group = FALSE;
2155 }
2156
2157 /* Now build the unique message id. This has changed several times over the
2158 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2159 Retaining all the history in the comment has become too unwieldy - read
2160 previous release sources if you want it.
2161
2162 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2163 The first part is the current time, in seconds. The second part is the current
2164 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2165 can hold a number in the range 0-3843. It used to be a computed sequence
2166 number, but is now the fractional component of the current time in units of
2167 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2168 received, Exim ensures that the timer has ticked at the appropriate level
2169 before proceeding, to avoid duplication if the pid happened to be re-used
2170 within the same time period. It seems likely that most messages will take at
2171 least half a millisecond to be received, so no delay will normally be
2172 necessary. At least for some time...
2173
2174 There is a modification when localhost_number is set. Formerly this was allowed
2175 to be as large as 255. Now it is restricted to the range 0-16, and the final
2176 component of the message id becomes (localhost_number * 200) + fractional time
2177 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2178
2179 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2180 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2181 still allows the tttttt field to hold a large enough number to last for some
2182 more decades, and the final two-digit field can hold numbers up to 1295, which
2183 is enough for milliseconds (instead of 1/2000 of a second).
2184
2185 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2186 pid, so it is probably safe because pids have to be positive. The
2187 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2188 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2189
2190 Note that string_base62() returns its data in a static storage block, so it
2191 must be copied before calling string_base62() again. It always returns exactly
2192 6 characters.
2193
2194 There doesn't seem to be anything in the RFC which requires a message id to
2195 start with a letter, but Smail was changed to ensure this. The external form of
2196 the message id (as supplied by string expansion) therefore starts with an
2197 additional leading 'E'. The spool file names do not include this leading
2198 letter and it is not used internally.
2199
2200 NOTE: If ever the format of message ids is changed, the regular expression for
2201 checking that a string is in this format must be updated in a corresponding
2202 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2203 must also be changed to reflect the correct string length. Then, of course,
2204 other programs that rely on the message id format will need updating too. */
2205
2206 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2207 message_id[6] = '-';
2208 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2209
2210 /* Deal with the case where the host number is set. The value of the number was
2211 checked when it was read, to ensure it isn't too big. The timing granularity is
2212 left in id_resolution so that an appropriate wait can be done after receiving
2213 the message, if necessary (we hope it won't be). */
2214
2215 if (host_number_string != NULL)
2216 {
2217 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2218 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2219 string_base62((long int)(
2220 host_number * (1000000/id_resolution) +
2221 message_id_tv.tv_usec/id_resolution)) + 4);
2222 }
2223
2224 /* Host number not set: final field is just the fractional time at an
2225 appropriate resolution. */
2226
2227 else
2228 {
2229 id_resolution = (BASE_62 == 62)? 500 : 1000;
2230 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2231 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2232 }
2233
2234 /* Add the current message id onto the current process info string if
2235 it will fit. */
2236
2237 (void)string_format(process_info + process_info_len,
2238 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2239
2240 /* If we are using multiple input directories, set up the one for this message
2241 to be the least significant base-62 digit of the time of arrival. Otherwise
2242 ensure that it is an empty string. */
2243
2244 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2245
2246 /* Now that we have the message-id, if there is no message-id: header, generate
2247 one, but only for local or submission mode messages. This can be
2248 user-configured if required, but we had better flatten any illegal characters
2249 therein. */
2250
2251 if (msgid_header == NULL && (sender_host_address == NULL || submission_mode))
2252 {
2253 uschar *p;
2254 uschar *id_text = US"";
2255 uschar *id_domain = primary_hostname;
2256
2257 /* Permit only letters, digits, dots, and hyphens in the domain */
2258
2259 if (message_id_domain != NULL)
2260 {
2261 uschar *new_id_domain = expand_string(message_id_domain);
2262 if (new_id_domain == NULL)
2263 {
2264 if (!expand_string_forcedfail)
2265 log_write(0, LOG_MAIN|LOG_PANIC,
2266 "expansion of \"%s\" (message_id_header_domain) "
2267 "failed: %s", message_id_domain, expand_string_message);
2268 }
2269 else if (*new_id_domain != 0)
2270 {
2271 id_domain = new_id_domain;
2272 for (p = id_domain; *p != 0; p++)
2273 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2274 }
2275 }
2276
2277 /* Permit all characters except controls and RFC 2822 specials in the
2278 additional text part. */
2279
2280 if (message_id_text != NULL)
2281 {
2282 uschar *new_id_text = expand_string(message_id_text);
2283 if (new_id_text == NULL)
2284 {
2285 if (!expand_string_forcedfail)
2286 log_write(0, LOG_MAIN|LOG_PANIC,
2287 "expansion of \"%s\" (message_id_header_text) "
2288 "failed: %s", message_id_text, expand_string_message);
2289 }
2290 else if (*new_id_text != 0)
2291 {
2292 id_text = new_id_text;
2293 for (p = id_text; *p != 0; p++)
2294 if (mac_iscntrl_or_special(*p)) *p = '-';
2295 }
2296 }
2297
2298 /* Add the header line */
2299
2300 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2301 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2302 }
2303
2304 /* If we are to log recipients, keep a copy of the raw ones before any possible
2305 rewriting. Must copy the count, because later ACLs and the local_scan()
2306 function may mess with the real recipients. */
2307
2308 if ((log_extra_selector & LX_received_recipients) != 0)
2309 {
2310 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2311 for (i = 0; i < recipients_count; i++)
2312 raw_recipients[i] = string_copy(recipients_list[i].address);
2313 raw_recipients_count = recipients_count;
2314 }
2315
2316 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2317 recipients will get here only if the conditions were right (allow_unqualified_
2318 recipient is TRUE). */
2319
2320 for (i = 0; i < recipients_count; i++)
2321 recipients_list[i].address =
2322 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2323 global_rewrite_rules, rewrite_existflags);
2324
2325 /* If there is no From: header, generate one for local or submission_mode
2326 messages. If there is no sender address, but the sender is local or this is a
2327 local delivery error, use the originator login. This shouldn't happen for
2328 genuine bounces, but might happen for autoreplies. The addition of From: must
2329 be done *before* checking for the possible addition of a Sender: header,
2330 because untrusted_set_sender allows an untrusted user to set anything in the
2331 envelope (which might then get info From:) but we still want to ensure a valid
2332 Sender: if it is required. */
2333
2334 if (from_header == NULL && (sender_host_address == NULL || submission_mode))
2335 {
2336 /* Envelope sender is empty */
2337
2338 if (sender_address[0] == 0)
2339 {
2340 if (sender_local || local_error_message)
2341 {
2342 header_add(htype_from, "%sFrom: %s%s%s@%s%s\n", resent_prefix,
2343 originator_name,
2344 (originator_name[0] == 0)? "" : " <",
2345 local_part_quote(originator_login),
2346 qualify_domain_sender,
2347 (originator_name[0] == 0)? "" : ">");
2348 }
2349 else if (submission_mode && authenticated_id != NULL)
2350 {
2351 if (submission_domain == NULL)
2352 {
2353 header_add(htype_from, "%sFrom: %s@%s\n", resent_prefix,
2354 local_part_quote(authenticated_id), qualify_domain_sender);
2355 }
2356 else if (submission_domain[0] == 0) /* empty => whole address set */
2357 {
2358 header_add(htype_from, "%sFrom: %s\n", resent_prefix,
2359 authenticated_id);
2360 }
2361 else
2362 {
2363 header_add(htype_from, "%sFrom: %s@%s\n", resent_prefix,
2364 local_part_quote(authenticated_id), submission_domain);
2365 }
2366 from_header = header_last; /* To get it checked for Sender: */
2367 }
2368 }
2369
2370 /* There is a non-null envelope sender. Build the header using the original
2371 sender address, before any rewriting that might have been done while
2372 verifying it. */
2373
2374 else
2375 {
2376 if (!smtp_input || sender_local)
2377 header_add(htype_from, "%sFrom: %s%s%s%s\n",
2378 resent_prefix, originator_name,
2379 (originator_name[0] == 0)? "" : " <",
2380 (sender_address_unrewritten == NULL)?
2381 sender_address : sender_address_unrewritten,
2382 (originator_name[0] == 0)? "" : ">");
2383 else
2384 header_add(htype_from, "%sFrom: %s\n", resent_prefix, sender_address);
2385
2386 from_header = header_last; /* To get it checked for Sender: */
2387 }
2388 }
2389
2390
2391 /* If the sender is local, or if we are in submission mode and there is an
2392 authenticated_id, check that an existing From: is correct, and if not, generate
2393 a Sender: header, unless disabled. Any previously-existing Sender: header was
2394 removed above. Note that sender_local, as well as being TRUE if the caller of
2395 exim is not trusted, is also true if a trusted caller did not supply a -f
2396 argument for non-smtp input. To allow trusted callers to forge From: without
2397 supplying -f, we have to test explicitly here. If the From: header contains
2398 more than one address, then the call to parse_extract_address fails, and a
2399 Sender: header is inserted, as required. */
2400
2401 if (from_header != NULL &&
2402 (active_local_from_check &&
2403 ((sender_local && !trusted_caller) ||
2404 (submission_mode && authenticated_id != NULL))
2405 ))
2406 {
2407 BOOL make_sender = TRUE;
2408 int start, end, domain;
2409 uschar *errmess;
2410 uschar *from_address =
2411 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2412 &start, &end, &domain, FALSE);
2413 uschar *generated_sender_address;
2414
2415 if (submission_mode)
2416 {
2417 if (submission_domain == NULL)
2418 {
2419 generated_sender_address = string_sprintf("%s@%s",
2420 local_part_quote(authenticated_id), qualify_domain_sender);
2421 }
2422 else if (submission_domain[0] == 0) /* empty => full address */
2423 {
2424 generated_sender_address = string_sprintf("%s",
2425 authenticated_id);
2426 }
2427 else
2428 {
2429 generated_sender_address = string_sprintf("%s@%s",
2430 local_part_quote(authenticated_id), submission_domain);
2431 }
2432 }
2433 else
2434 generated_sender_address = string_sprintf("%s@%s",
2435 local_part_quote(originator_login), qualify_domain_sender);
2436
2437 /* Remove permitted prefixes and suffixes from the local part of the From:
2438 address before doing the comparison with the generated sender. */
2439
2440 if (from_address != NULL)
2441 {
2442 int slen;
2443 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2444
2445 if (at != NULL) *at = 0;
2446 from_address += route_check_prefix(from_address, local_from_prefix);
2447 slen = route_check_suffix(from_address, local_from_suffix);
2448 if (slen > 0)
2449 {
2450 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2451 from_address += slen;
2452 }
2453 if (at != NULL) *at = '@';
2454
2455 if (strcmpic(generated_sender_address, from_address) == 0 ||
2456 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2457 make_sender = FALSE;
2458 }
2459
2460 /* We have to cause the Sender header to be rewritten if there are
2461 appropriate rewriting rules. */
2462
2463 if (make_sender)
2464 {
2465 if (submission_mode)
2466 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2467 generated_sender_address);
2468 else
2469 header_add(htype_sender, "%sSender: %s <%s>\n",
2470 resent_prefix, originator_name, generated_sender_address);
2471 }
2472 }
2473
2474
2475 /* If there are any rewriting rules, apply them to the sender address, unless
2476 it has already been rewritten as part of verification for SMTP input. */
2477
2478 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2479 sender_address[0] != 0)
2480 {
2481 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2482 global_rewrite_rules, rewrite_existflags);
2483 DEBUG(D_receive|D_rewrite)
2484 debug_printf("rewritten sender = %s\n", sender_address);
2485 }
2486
2487
2488 /* The headers must be run through rewrite_header(), because it ensures that
2489 addresses are fully qualified, as well as applying any rewriting rules that may
2490 exist.
2491
2492 Qualification of header addresses in a message from a remote host happens only
2493 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2494 appropriate. For local messages, qualification always happens, unless -bnq is
2495 used to explicitly suppress it. No rewriting is done for an unqualified address
2496 that is left untouched.
2497
2498 We start at the second header, skipping our own Received:. This rewriting is
2499 documented as happening *after* recipient addresses are taken from the headers
2500 by the -t command line option. An added Sender: gets rewritten here. */
2501
2502 for (h = header_list->next; h != NULL; h = h->next)
2503 {
2504 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2505 rewrite_existflags, TRUE);
2506 if (newh != NULL) h = newh;
2507 }
2508
2509
2510 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2511 "cc", or "bcc". Note that although the minimal examples in RFC822 show just
2512 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2513 exists, this applies to the set of resent- headers rather than the normal set.
2514
2515 The requirement for a recipient header has been removed in RFC 2822. Earlier
2516 versions of Exim added a To: header for locally submitted messages, and an
2517 empty Bcc: header for others or when always_bcc was set. In the light of the
2518 changes in RFC 2822, we now always add Bcc: just in case there are still MTAs
2519 out there that insist on the RFC 822 syntax.
2520
2521 November 2003: While generally revising what Exim does to fix up headers, it
2522 seems like a good time to remove this altogether. */
2523
2524 /******
2525 if (!to_or_cc_header_exists && !bcc_header_exists)
2526 header_add(htype_bcc, "Bcc:\n");
2527 ******/
2528
2529 /* If there is no date header, generate one if the message originates locally
2530 (i.e. not over TCP/IP) or the submission mode flag is set. Messages without
2531 Date: are not valid, but it seems to be more confusing if Exim adds one to
2532 all remotely-originated messages. */
2533
2534 if (!date_header_exists && (sender_host_address == NULL || submission_mode))
2535 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2536
2537 search_tidyup(); /* Free any cached resources */
2538
2539 /* Show the complete set of headers if debugging. Note that the first one (the
2540 new Received:) has not yet been set. */
2541
2542 DEBUG(D_receive)
2543 {
2544 debug_printf(">>Headers after rewriting and local additions:\n");
2545 for (h = header_list->next; h != NULL; h = h->next)
2546 debug_printf("%c %s", h->type, h->text);
2547 debug_printf("\n");
2548 }
2549
2550 /* The headers are now complete in store. If we are running in filter
2551 testing mode, that is all this function does. Return TRUE if the message
2552 ended with a dot. */
2553
2554 if (filter_test != FTEST_NONE)
2555 {
2556 process_info[process_info_len] = 0;
2557 return message_ended == END_DOT;
2558 }
2559
2560 /* Open a new spool file for the data portion of the message. We need
2561 to access it both via a file descriptor and a stream. Try to make the
2562 directory if it isn't there. Note re use of sprintf: spool_directory
2563 is checked on input to be < 200 characters long. */
2564
2565 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2566 message_id);
2567 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2568 if (data_fd < 0)
2569 {
2570 if (errno == ENOENT)
2571 {
2572 uschar temp[16];
2573 sprintf(CS temp, "input/%s", message_subdir);
2574 if (message_subdir[0] == 0) temp[5] = 0;
2575 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2576 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2577 }
2578 if (data_fd < 0)
2579 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2580 spool_name, strerror(errno));
2581 }
2582
2583 /* Make sure the file's group is the Exim gid, and double-check the mode
2584 because the group setting doesn't always get set automatically. */
2585
2586 fchown(data_fd, exim_uid, exim_gid);
2587 fchmod(data_fd, SPOOL_MODE);
2588
2589 /* We now have data file open. Build a stream for it and lock it. We lock only
2590 the first line of the file (containing the message ID) because otherwise there
2591 are problems when Exim is run under Cygwin (I'm told). See comments in
2592 spool_in.c, where the same locking is done. */
2593
2594 data_file = fdopen(data_fd, "w+");
2595 lock_data.l_type = F_WRLCK;
2596 lock_data.l_whence = SEEK_SET;
2597 lock_data.l_start = 0;
2598 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2599
2600 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2601 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2602 errno, strerror(errno));
2603
2604 /* We have an open, locked data file. Write the message id to it to make it
2605 self-identifying. Then read the remainder of the input of this message and
2606 write it to the data file. If the variable next != NULL, it contains the first
2607 data line (which was read as a header but then turned out not to have the right
2608 format); write it (remembering that it might contain binary zeros). The result
2609 of fwrite() isn't inspected; instead we call ferror() below. */
2610
2611 fprintf(data_file, "%s-D\n", message_id);
2612 if (next != NULL)
2613 {
2614 uschar *s = next->text;
2615 int len = next->slen;
2616 fwrite(s, 1, len, data_file);
2617 body_linecount++; /* Assumes only 1 line */
2618 }
2619
2620 /* Note that we might already be at end of file, or the logical end of file
2621 (indicated by '.'), or might have encountered an error while writing the
2622 message id or "next" line. */
2623
2624 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2625 {
2626 if (smtp_input)
2627 {
2628 message_ended = read_message_data_smtp(data_file);
2629 receive_linecount++; /* The terminating "." line */
2630 }
2631 else message_ended = read_message_data(data_file);
2632
2633 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2634
2635 /* Handle premature termination of SMTP */
2636
2637 if (smtp_input && message_ended == END_EOF)
2638 {
2639 Uunlink(spool_name); /* Lose data file when closed */
2640 message_id[0] = 0; /* Indicate no message accepted */
2641 smtp_reply = handle_lost_connection(US"");
2642 smtp_yield = FALSE;
2643 goto TIDYUP; /* Skip to end of function */
2644 }
2645
2646 /* Handle message that is too big. Don't use host_or_ident() in the log
2647 message; we want to see the ident value even for non-remote messages. */
2648
2649 if (message_ended == END_SIZE)
2650 {
2651 Uunlink(spool_name); /* Lose the data file when closed */
2652 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2653
2654 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2655 "message too big: read=%d max=%d",
2656 sender_address,
2657 (sender_fullhost == NULL)? "" : " H=",
2658 (sender_fullhost == NULL)? US"" : sender_fullhost,
2659 (sender_ident == NULL)? "" : " U=",
2660 (sender_ident == NULL)? US"" : sender_ident,
2661 message_size,
2662 thismessage_size_limit);
2663
2664 if (smtp_input)
2665 {
2666 smtp_reply = US"552 Message size exceeds maximum permitted";
2667 message_id[0] = 0; /* Indicate no message accepted */
2668 goto TIDYUP; /* Skip to end of function */
2669 }
2670 else
2671 {
2672 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2673 give_local_error(ERRMESS_TOOBIG,
2674 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2675 US"message rejected: ", error_rc, data_file, header_list);
2676 /* Does not return */
2677 }
2678 }
2679 }
2680
2681 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2682 example, there may be some expansion in an ACL that uses a timer.) */
2683
2684 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2685
2686 /* The message body has now been read into the data file. Call fflush() to
2687 empty the buffers in C, and then call fsync() to get the data written out onto
2688 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2689 having to do this). If there was an I/O error on either input or output,
2690 attempt to send an error message, and unlink the spool file. For non-SMTP input
2691 we can then give up. Note that for SMTP input we must swallow the remainder of
2692 the input in cases of output errors, since the far end doesn't expect to see
2693 anything until the terminating dot line is sent. */
2694
2695 if (fflush(data_file) == EOF || ferror(data_file) ||
2696 fsync(fileno(data_file)) < 0 || (receive_ferror)())
2697 {
2698 uschar *msg_errno = US strerror(errno);
2699 BOOL input_error = (receive_ferror)() != 0;
2700 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2701 input_error? "Input read" : "Spool write",
2702 msg_errno,
2703 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2704
2705 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2706 Uunlink(spool_name); /* Lose the data file */
2707
2708 if (smtp_input)
2709 {
2710 if (input_error)
2711 smtp_reply = US"451 Error while reading input data";
2712 else
2713 {
2714 smtp_reply = US"451 Error while writing spool file";
2715 receive_swallow_smtp();
2716 }
2717 message_id[0] = 0; /* Indicate no message accepted */
2718 goto TIDYUP; /* Skip to end of function */
2719 }
2720
2721 else
2722 {
2723 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2724 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2725 header_list);
2726 /* Does not return */
2727 }
2728 }
2729
2730
2731 /* No I/O errors were encountered while writing the data file. */
2732
2733 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2734
2735
2736 /* If there were any bad addresses extracted by -t, or there were no recipients
2737 left after -t, send a message to the sender of this message, or write it to
2738 stderr if the error handling option is set that way. Note that there may
2739 legitimately be no recipients for an SMTP message if they have all been removed
2740 by "discard".
2741
2742 We need to rewind the data file in order to read it. In the case of no
2743 recipients or stderr error writing, throw the data file away afterwards, and
2744 exit. (This can't be SMTP, which always ensures there's at least one
2745 syntactically good recipient address.) */
2746
2747 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2748 {
2749 DEBUG(D_receive)
2750 {
2751 if (recipients_count == 0) debug_printf("*** No recipients\n");
2752 if (bad_addresses != NULL)
2753 {
2754 error_block *eblock = bad_addresses;
2755 debug_printf("*** Bad address(es)\n");
2756 while (eblock != NULL)
2757 {
2758 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2759 eblock = eblock->next;
2760 }
2761 }
2762 }
2763
2764 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2765
2766 /* If configured to send errors to the sender, but this fails, force
2767 a failure error code. We use a special one for no recipients so that it
2768 can be detected by the autoreply transport. Otherwise error_rc is set to
2769 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2770 it is EXIT_SUCCESS. */
2771
2772 if (error_handling == ERRORS_SENDER)
2773 {
2774 if (!moan_to_sender(
2775 (bad_addresses == NULL)?
2776 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2777 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2778 bad_addresses, header_list, data_file, FALSE))
2779 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2780 }
2781 else
2782 {
2783 if (bad_addresses == NULL)
2784 {
2785 if (extracted_ignored)
2786 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2787 else
2788 fprintf(stderr, "exim: no recipients in message\n");
2789 }
2790 else
2791 {
2792 fprintf(stderr, "exim: invalid address%s",
2793 (bad_addresses->next == NULL)? ":" : "es:\n");
2794 while (bad_addresses != NULL)
2795 {
2796 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2797 bad_addresses->text2);
2798 bad_addresses = bad_addresses->next;
2799 }
2800 }
2801 }
2802
2803 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2804 {
2805 Uunlink(spool_name);
2806 fclose(data_file);
2807 exim_exit(error_rc);
2808 }
2809 }
2810
2811 /* Data file successfully written. Generate text for the Received: header by
2812 expanding the configured string, and adding a timestamp. By leaving this
2813 operation till now, we ensure that the timestamp is the time that message
2814 reception was completed. However, this is deliberately done before calling the
2815 data ACL and local_scan().
2816
2817 This Received: header may therefore be inspected by the data ACL and by code in
2818 the local_scan() function. When they have run, we update the timestamp to be
2819 the final time of reception.
2820
2821 If there is just one recipient, set up its value in the $received_for variable
2822 for use when we generate the Received: header.
2823
2824 Note: the checking for too many Received: headers is handled by the delivery
2825 code. */
2826
2827 timestamp = expand_string(US"${tod_full}");
2828 if (recipients_count == 1) received_for = recipients_list[0].address;
2829 received = expand_string(received_header_text);
2830 received_for = NULL;
2831
2832 if (received == NULL)
2833 {
2834 Uunlink(spool_name); /* Lose the data file */
2835 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2836 "(received_header_text) failed: %s", string_printing(received_header_text),
2837 expand_string_message);
2838 }
2839
2840 /* The first element on the header chain is reserved for the Received header,
2841 so all we have to do is fill in the text pointer, and set the type. However, if
2842 the result of the expansion is an empty string, we leave the header marked as
2843 "old" so as to refrain from adding a Received header. */
2844
2845 if (received[0] == 0)
2846 {
2847 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2848 received_header->type = htype_old;
2849 }
2850 else
2851 {
2852 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2853 received_header->type = htype_received;
2854 }
2855
2856 received_header->slen = Ustrlen(received_header->text);
2857
2858 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2859 received_header->type, received_header->text);
2860
2861 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2862
2863 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2864 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2865
2866 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2867 now, before running the DATA ACL. */
2868
2869 add_acl_headers(US"MAIL or RCPT");
2870
2871 /* If an ACL is specified for checking things at this stage of reception of a
2872 message, run it, unless all the recipients were removed by "discard" in earlier
2873 ACLs. That is the only case in which recipients_count can be zero at this
2874 stage. Set deliver_datafile to point to the data file so that $message_body and
2875 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2876 */
2877
2878 deliver_datafile = data_fd;
2879
2880 if (recipients_count == 0)
2881 {
2882 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2883 }
2884 else
2885 {
2886 enable_dollar_recipients = TRUE;
2887
2888 /* Handle interactive SMTP messages */
2889
2890 if (smtp_input && !smtp_batched_input)
2891 {
2892
2893 #ifdef EXPERIMENTAL_DOMAINKEYS
2894 dk_exim_verify_finish();
2895 #endif
2896
2897 #ifdef WITH_CONTENT_SCAN
2898 if (acl_smtp_mime != NULL &&
2899 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
2900 goto TIDYUP;
2901 #endif /* WITH_CONTENT_SCAN */
2902
2903 /* Check the recipients count again, as the MIME ACL might have changed
2904 them. */
2905
2906 if (acl_smtp_data != NULL && recipients_count > 0)
2907 {
2908 uschar *user_msg, *log_msg;
2909 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
2910 add_acl_headers(US"DATA");
2911 if (rc == DISCARD)
2912 {
2913 recipients_count = 0;
2914 blackholed_by = US"DATA ACL";
2915 if (log_msg != NULL)
2916 blackhole_log_msg = string_sprintf(": %s", log_msg);
2917 }
2918 else if (rc != OK)
2919 {
2920 Uunlink(spool_name);
2921 #ifdef WITH_CONTENT_SCAN
2922 unspool_mbox();
2923 #endif
2924 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
2925 smtp_yield = FALSE; /* No more messsages after dropped connection */
2926 smtp_reply = US""; /* Indicate reply already sent */
2927 message_id[0] = 0; /* Indicate no message accepted */
2928 goto TIDYUP; /* Skip to end of function */
2929 }
2930 }
2931 }
2932
2933 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
2934 we cannot take different actions for permanent and temporary rejections. */
2935
2936 else
2937 {
2938
2939 #ifdef WITH_CONTENT_SCAN
2940 if (acl_not_smtp_mime != NULL &&
2941 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
2942 &blackholed_by))
2943 goto TIDYUP;
2944 #endif /* WITH_CONTENT_SCAN */
2945
2946 if (acl_not_smtp != NULL)
2947 {
2948 uschar *user_msg, *log_msg;
2949 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
2950 if (rc == DISCARD)
2951 {
2952 recipients_count = 0;
2953 blackholed_by = US"non-SMTP ACL";
2954 if (log_msg != NULL)
2955 blackhole_log_msg = string_sprintf(": %s", log_msg);
2956 }
2957 else if (rc != OK)
2958 {
2959 Uunlink(spool_name);
2960 #ifdef WITH_CONTENT_SCAN
2961 unspool_mbox();
2962 #endif
2963 log_write(0, LOG_MAIN|LOG_REJECT, "F=<%s> rejected by non-SMTP ACL: %s",
2964 sender_address, log_msg);
2965 if (user_msg == NULL) user_msg = US"local configuration problem";
2966 if (smtp_batched_input)
2967 {
2968 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
2969 /* Does not return */
2970 }
2971 else
2972 {
2973 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2974 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
2975 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
2976 header_list);
2977 /* Does not return */
2978 }
2979 }
2980 add_acl_headers(US"non-SMTP");
2981 }
2982 }
2983
2984 /* The applicable ACLs have been run */
2985
2986 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
2987 if (queue_only_policy) queued_by = US"ACL";
2988
2989 enable_dollar_recipients = FALSE;
2990 }
2991
2992 #ifdef WITH_CONTENT_SCAN
2993 unspool_mbox();
2994 #endif
2995
2996 /* The final check on the message is to run the scan_local() function. The
2997 version supplied with Exim always accepts, but this is a hook for sysadmins to
2998 supply their own checking code. The local_scan() function is run even when all
2999 the recipients have been discarded. */
3000
3001 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3002
3003 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3004 deleted, and the incident gets logged. */
3005
3006 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3007 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3008 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3009 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3010
3011 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3012 local_scan_timeout);
3013 local_scan_data = NULL;
3014
3015 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3016 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3017 rc = local_scan(data_fd, &local_scan_data);
3018 alarm(0);
3019 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3020
3021 store_pool = POOL_MAIN; /* In case changed */
3022 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3023 local_scan_data);
3024
3025 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3026 os_non_restarting_signal(SIGFPE, SIG_DFL);
3027 os_non_restarting_signal(SIGILL, SIG_DFL);
3028 os_non_restarting_signal(SIGBUS, SIG_DFL);
3029
3030 /* The length check is paranoia against some runaway code, and also because
3031 (for a success return) lines in the spool file are read into big_buffer. */
3032
3033 if (local_scan_data != NULL)
3034 {
3035 int len = Ustrlen(local_scan_data);
3036 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3037 local_scan_data = string_copyn(local_scan_data, len);
3038 }
3039
3040 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3041 {
3042 if (!deliver_freeze) /* ACL might have already frozen */
3043 {
3044 deliver_freeze = TRUE;
3045 deliver_frozen_at = time(NULL);
3046 frozen_by = US"local_scan()";
3047 }
3048 rc = LOCAL_SCAN_ACCEPT;
3049 }
3050 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3051 {
3052 if (!queue_only_policy) /* ACL might have already queued */
3053 {
3054 queue_only_policy = TRUE;
3055 queued_by = US"local_scan()";
3056 }
3057 rc = LOCAL_SCAN_ACCEPT;
3058 }
3059
3060 /* Message accepted: remove newlines in local_scan_data because otherwise
3061 the spool file gets corrupted. Ensure that all recipients are qualified. */
3062
3063 if (rc == LOCAL_SCAN_ACCEPT)
3064 {
3065 if (local_scan_data != NULL)
3066 {
3067 uschar *s;
3068 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3069 }
3070 for (i = 0; i < recipients_count; i++)
3071 {
3072 recipient_item *r = recipients_list + i;
3073 r->address = rewrite_address_qualify(r->address, TRUE);
3074 if (r->errors_to != NULL)
3075 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3076 }
3077 if (recipients_count == 0 && blackholed_by == NULL)
3078 blackholed_by = US"local_scan";
3079 }
3080
3081 /* Message rejected: newlines permitted in local_scan_data to generate
3082 multiline SMTP responses. */
3083
3084 else
3085 {
3086 uschar *istemp = US"";
3087 uschar *s = NULL;
3088 int size = 0;
3089 int sptr = 0;
3090 int code;
3091
3092 errmsg = local_scan_data;
3093
3094 Uunlink(spool_name); /* Cancel this message */
3095 switch(rc)
3096 {
3097 default:
3098 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3099 "rejection given", rc);
3100 goto TEMPREJECT;
3101
3102 case LOCAL_SCAN_REJECT_NOLOGHDR:
3103 log_extra_selector &= ~LX_rejected_header;
3104 /* Fall through */
3105
3106 case LOCAL_SCAN_REJECT:
3107 code = 550;
3108 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3109 break;
3110
3111 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3112 log_extra_selector &= ~LX_rejected_header;
3113 /* Fall through */
3114
3115 case LOCAL_SCAN_TEMPREJECT:
3116 TEMPREJECT:
3117 code = 451;
3118 if (errmsg == NULL) errmsg = US"Temporary local problem";
3119 istemp = US"temporarily ";
3120 break;
3121 }
3122
3123 s = string_append(s, &size, &sptr, 2, US"F=",
3124 (sender_address[0] == 0)? US"<>" : sender_address);
3125 s = add_host_info_for_log(s, &size, &sptr);
3126 s[sptr] = 0;
3127
3128 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3129 s, istemp, string_printing(errmsg));
3130
3131 if (smtp_input)
3132 {
3133 if (!smtp_batched_input)
3134 {
3135 smtp_respond(code, TRUE, errmsg);
3136 message_id[0] = 0; /* Indicate no message accepted */
3137 smtp_reply = US""; /* Indicate reply already sent */
3138 goto TIDYUP; /* Skip to end of function */
3139 }
3140 else
3141 {
3142 moan_smtp_batch(NULL, "%d %s", code, errmsg);
3143 /* Does not return */
3144 }
3145 }
3146 else
3147 {
3148 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3149 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3150 US"message rejected by local scan code: ", error_rc, data_file,
3151 header_list);
3152 /* Does not return */
3153 }
3154 }
3155
3156 /* Reset signal handlers to ignore signals that previously would have caused
3157 the message to be abandoned. */
3158
3159 signal(SIGTERM, SIG_IGN);
3160 signal(SIGINT, SIG_IGN);
3161
3162 /* Ensure the first time flag is set in the newly-received message. */
3163
3164 deliver_firsttime = TRUE;
3165
3166 #ifdef EXPERIMENTAL_BRIGHTMAIL
3167 if (bmi_run == 1) {
3168 /* rewind data file */
3169 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3170 bmi_verdicts = bmi_process_message(header_list, data_fd);
3171 };
3172 #endif
3173
3174 /* Update the timstamp in our Received: header to account for any time taken by
3175 an ACL or by local_scan(). The new time is the time that all reception
3176 processing is complete. */
3177
3178 timestamp = expand_string(US"${tod_full}");
3179 tslen = Ustrlen(timestamp);
3180
3181 memcpy(received_header->text + received_header->slen - tslen - 1,
3182 timestamp, tslen);
3183
3184 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3185
3186 if (mua_wrapper)
3187 {
3188 deliver_freeze = FALSE;
3189 queue_only_policy = FALSE;
3190 }
3191
3192 /* Keep the data file open until we have written the header file, in order to
3193 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3194 don't write the header file, and we unlink the data file. If writing the header
3195 file fails, we have failed to accept this message. */
3196
3197 if (host_checking || blackholed_by != NULL)
3198 {
3199 header_line *h;
3200 Uunlink(spool_name);
3201 msg_size = 0; /* Compute size for log line */
3202 for (h = header_list; h != NULL; h = h->next)
3203 if (h->type != '*') msg_size += h->slen;
3204 }
3205
3206 /* Write the -H file */
3207
3208 else
3209 {
3210 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3211 {
3212 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3213 Uunlink(spool_name); /* Lose the data file */
3214
3215 if (smtp_input)
3216 {
3217 smtp_reply = US"451 Error in writing spool file";
3218 message_id[0] = 0; /* Indicate no message accepted */
3219 goto TIDYUP;
3220 }
3221 else
3222 {
3223 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3224 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3225 header_list);
3226 /* Does not return */
3227 }
3228 }
3229 }
3230
3231
3232 /* The message has now been successfully received. */
3233
3234 receive_messagecount++;
3235
3236 /* In SMTP sessions we may receive several in one connection. After each one,
3237 we wait for the clock to tick at the level of message-id granularity. This is
3238 so that the combination of time+pid is unique, even on systems where the pid
3239 can be re-used within our time interval. We can't shorten the interval without
3240 re-designing the message-id. See comments above where the message id is
3241 created. This is Something For The Future. */
3242
3243 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3244 exim_wait_tick(&message_id_tv, id_resolution);
3245
3246 /* Add data size to written header size. We do not count the initial file name
3247 that is in the file, but we do add one extra for the notional blank line that
3248 precedes the data. This total differs from message_size in that it include the
3249 added Received: header and any other headers that got created locally. */
3250
3251 fflush(data_file);
3252 fstat(data_fd, &statbuf);
3253
3254 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3255
3256 /* Generate a "message received" log entry. We do this by building up a dynamic
3257 string as required. Since we commonly want to add two items at a time, use a
3258 macro to simplify the coding. We log the arrival of a new message while the
3259 file is still locked, just in case the machine is *really* fast, and delivers
3260 it first! Include any message id that is in the message - since the syntax of a
3261 message id is actually an addr-spec, we can use the parse routine to canonicize
3262 it. */
3263
3264 size = 256;
3265 sptr = 0;
3266 s = store_get(size);
3267
3268 s = string_append(s, &size, &sptr, 2, US"<= ",
3269 (sender_address[0] == 0)? US"<>" : sender_address);
3270 if (message_reference != NULL)
3271 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3272
3273 s = add_host_info_for_log(s, &size, &sptr);
3274
3275 #ifdef SUPPORT_TLS
3276 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3277 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3278 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3279 tls_cipher != NULL)
3280 s = string_append(s, &size, &sptr, 2, US" CV=",
3281 tls_certificate_verified? "yes":"no");
3282 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3283 s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\"");
3284 #endif
3285
3286 if (sender_host_authenticated != NULL)
3287 {
3288 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3289 if (authenticated_id != NULL)
3290 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3291 }
3292
3293 sprintf(CS big_buffer, "%d", msg_size);
3294 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3295
3296 /* If an addr-spec in a message-id contains a quoted string, it can contain
3297 any characters except " \ and CR and so in particular it can contain NL!
3298 Therefore, make sure we use a printing-characters only version for the log.
3299 Also, allow for domain literals in the message id. */
3300
3301 if (msgid_header != NULL)
3302 {
3303 uschar *old_id;
3304 BOOL save_allow_domain_literals = allow_domain_literals;
3305 allow_domain_literals = TRUE;
3306 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3307 &errmsg, &start, &end, &domain, FALSE);
3308 allow_domain_literals = save_allow_domain_literals;
3309 if (old_id != NULL)
3310 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3311 }
3312
3313 /* If subject logging is turned on, create suitable printing-character
3314 text. By expanding $h_subject: we make use of the MIME decoding. */
3315
3316 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3317 {
3318 int i;
3319 uschar *p = big_buffer;
3320 uschar *ss = expand_string(US"$h_subject:");
3321
3322 /* Backslash-quote any double quotes or backslashes so as to make a
3323 a C-like string, and turn any non-printers into escape sequences. */
3324
3325 *p++ = '\"';
3326 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3327 {
3328 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3329 *p++ = ss[i];
3330 }
3331 *p++ = '\"';
3332 *p = 0;
3333 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3334 }
3335
3336 /* Terminate the string: string_cat() and string_append() leave room, but do
3337 not put the zero in. */
3338
3339 s[sptr] = 0;
3340
3341 /* While writing to the log, set a flag to cause a call to receive_bomb_out()
3342 if the log cannot be opened. */
3343
3344 receive_call_bombout = TRUE;
3345 log_write(0, LOG_MAIN |
3346 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3347 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3348 "%s", s);
3349 receive_call_bombout = FALSE;
3350
3351 /* Log any control actions taken by an ACL or local_scan(). */
3352
3353 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3354 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3355 "no immediate delivery: queued by %s", queued_by);
3356
3357 /* Create a message log file if message logs are being used and this message is
3358 not blackholed. Write the reception stuff to it. We used to leave message log
3359 creation until the first delivery, but this has proved confusing for somep
3360 people. */
3361
3362 if (message_logs && blackholed_by == NULL)
3363 {
3364 int fd;
3365
3366 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3367 message_id);
3368 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3369
3370 if (fd < 0 && errno == ENOENT)
3371 {
3372 uschar temp[16];
3373 sprintf(CS temp, "msglog/%s", message_subdir);
3374 if (message_subdir[0] == 0) temp[6] = 0;
3375 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3376 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3377 }
3378
3379 if (fd < 0)
3380 {
3381 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3382 spool_name, strerror(errno));
3383 }
3384
3385 else
3386 {
3387 FILE *message_log = fdopen(fd, "a");
3388 if (message_log == NULL)
3389 {
3390 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3391 spool_name, strerror(errno));
3392 close(fd);
3393 }
3394 else
3395 {
3396 uschar *now = tod_stamp(tod_log);
3397 fprintf(message_log, "%s Received from %s\n", now, s+3);
3398 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3399 frozen_by);
3400 if (queue_only_policy) fprintf(message_log,
3401 "%s no immediate delivery: queued by %s\n", now, queued_by);
3402 fclose(message_log);
3403 }
3404 }
3405 }
3406
3407 store_reset(s); /* The store for the main log message can be reused */
3408
3409 /* If the message is frozen, and freeze_tell is set, do the telling. */
3410
3411 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3412 {
3413 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3414 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3415 message_id, frozen_by, sender_address);
3416 }
3417
3418
3419 /* Either a message has been successfully received and written to the two spool
3420 files, or an error in writing the spool has occurred for an SMTP message, or
3421 an SMTP message has been rejected because of a bad sender. (For a non-SMTP
3422 message we will have already given up because there's no point in carrying on!)
3423 In either event, we must now close (and thereby unlock) the data file. In the
3424 successful case, this leaves the message on the spool, ready for delivery. In
3425 the error case, the spool file will be deleted. Then tidy up store, interact
3426 with an SMTP call if necessary, and return.
3427
3428 A fflush() was done earlier in the expectation that any write errors on the
3429 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3430 possible for fclose() to fail - but what to do? What has happened to the lock
3431 if this happens? */
3432
3433 TIDYUP:
3434 process_info[process_info_len] = 0; /* Remove message id */
3435 if (data_file != NULL) fclose(data_file); /* Frees the lock */
3436
3437 /* Now reset signal handlers to their defaults */
3438
3439 signal(SIGTERM, SIG_DFL);
3440 signal(SIGINT, SIG_DFL);
3441
3442 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3443 value, which defaults TRUE - meaning there may be more incoming messages from
3444 this connection. For non-SMTP callers (where there is only ever one message),
3445 the default is FALSE. */
3446
3447 if (smtp_input)
3448 {
3449 yield = smtp_yield;
3450
3451 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3452 is set to the response. However, after an ACL error or local_scan() error,
3453 the response has already been sent, and smtp_reply is an empty string to
3454 indicate this. */
3455
3456 if (!smtp_batched_input)
3457 {
3458 if (smtp_reply == NULL)
3459 {
3460 if (fake_reject)
3461 smtp_respond(550,TRUE,fake_reject_text);
3462 else
3463 smtp_printf("250 OK id=%s\r\n", message_id);
3464 if (host_checking)
3465 fprintf(stdout,
3466 "\n**** SMTP testing: that is not a real message id!\n\n");
3467 }
3468 else if (smtp_reply[0] != 0)
3469 {
3470 if (fake_reject && (smtp_reply[0] == '2'))
3471 smtp_respond(550,TRUE,fake_reject_text);
3472 else
3473 smtp_printf("%.1024s\r\n", smtp_reply);
3474 }
3475 }
3476
3477 /* For batched SMTP, generate an error message on failure, and do
3478 nothing on success. The function moan_smtp_batch() does not return -
3479 it exits from the program with a non-zero return code. */
3480
3481 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
3482 }
3483
3484
3485 /* If blackholing, we can immediately log this message's sad fate. The data
3486 file has already been unlinked, and the header file was never written to disk.
3487 We must now indicate that nothing was received, to prevent a delivery from
3488 starting. */
3489
3490 if (blackholed_by != NULL)
3491 {
3492 uschar *detail = (local_scan_data != NULL)?
3493 string_printing(local_scan_data) :
3494 string_sprintf("(%s discarded recipients)", blackholed_by);