221a4b69dc606acbb31be48b062024613c6cfb9e
[exim.git] / src / src / receive.c
1 /* $Cambridge: exim/src/src/receive.c,v 1.25 2006/02/07 11:19:00 ph10 Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2006 */
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) (void)fclose(data_file);
307 else if (data_fd >= 0) (void)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 (void)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 #ifdef WITH_CONTENT_SCAN
1012
1013 /*************************************************
1014 * Run the MIME ACL on a message *
1015 *************************************************/
1016
1017 /* This code is in a subroutine so that it can be used for both SMTP
1018 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1019
1020 Arguments:
1021 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1022 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1023 smtp_reply_ptr Where SMTP reply is being built
1024 blackholed_by_ptr Where "blackholed by" message is being built
1025
1026 Returns: TRUE to carry on; FALSE to abandon the message
1027 */
1028
1029 static BOOL
1030 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1031 uschar **blackholed_by_ptr)
1032 {
1033 FILE *mbox_file;
1034 uschar rfc822_file_path[2048];
1035 unsigned long mbox_size;
1036 header_line *my_headerlist;
1037 uschar *user_msg, *log_msg;
1038 int mime_part_count_buffer = -1;
1039 int rc;
1040
1041 memset(CS rfc822_file_path,0,2048);
1042
1043 /* check if it is a MIME message */
1044 my_headerlist = header_list;
1045 while (my_headerlist != NULL) {
1046 /* skip deleted headers */
1047 if (my_headerlist->type == '*') {
1048 my_headerlist = my_headerlist->next;
1049 continue;
1050 };
1051 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0) {
1052 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1053 goto DO_MIME_ACL;
1054 };
1055 my_headerlist = my_headerlist->next;
1056 };
1057
1058 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1059 return TRUE;
1060
1061 DO_MIME_ACL:
1062 /* make sure the eml mbox file is spooled up */
1063 mbox_file = spool_mbox(&mbox_size);
1064 if (mbox_file == NULL) {
1065 /* error while spooling */
1066 log_write(0, LOG_MAIN|LOG_PANIC,
1067 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1068 Uunlink(spool_name);
1069 unspool_mbox();
1070 smtp_respond(451, TRUE, US"temporary local problem");
1071 message_id[0] = 0; /* Indicate no message accepted */
1072 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1073 return FALSE; /* Indicate skip to end of receive function */
1074 };
1075
1076 mime_is_rfc822 = 0;
1077
1078 MIME_ACL_CHECK:
1079 mime_part_count = -1;
1080 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1081 (void)fclose(mbox_file);
1082
1083 if (Ustrlen(rfc822_file_path) > 0) {
1084 mime_part_count = mime_part_count_buffer;
1085
1086 if (unlink(CS rfc822_file_path) == -1) {
1087 log_write(0, LOG_PANIC,
1088 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1089 goto END_MIME_ACL;
1090 };
1091 };
1092
1093 /* check if we must check any message/rfc822 attachments */
1094 if (rc == OK) {
1095 uschar temp_path[1024];
1096 int n;
1097 struct dirent *entry;
1098 DIR *tempdir;
1099
1100 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1101 message_id);
1102
1103 tempdir = opendir(CS temp_path);
1104 n = 0;
1105 do {
1106 entry = readdir(tempdir);
1107 if (entry == NULL) break;
1108 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0) {
1109 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1110 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1111 break;
1112 };
1113 } while (1);
1114 closedir(tempdir);
1115
1116 if (entry != NULL) {
1117 mbox_file = Ufopen(rfc822_file_path,"rb");
1118 if (mbox_file == NULL) {
1119 log_write(0, LOG_PANIC,
1120 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1121 unlink(CS rfc822_file_path);
1122 goto END_MIME_ACL;
1123 };
1124 /* set RFC822 expansion variable */
1125 mime_is_rfc822 = 1;
1126 mime_part_count_buffer = mime_part_count;
1127 goto MIME_ACL_CHECK;
1128 };
1129 };
1130
1131 END_MIME_ACL:
1132 add_acl_headers(US"MIME");
1133 if (rc == DISCARD)
1134 {
1135 recipients_count = 0;
1136 *blackholed_by_ptr = US"MIME ACL";
1137 }
1138 else if (rc != OK)
1139 {
1140 Uunlink(spool_name);
1141 unspool_mbox();
1142 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1143 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1144 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1145 message_id[0] = 0; /* Indicate no message accepted */
1146 return FALSE; /* Cause skip to end of receive function */
1147 };
1148
1149 return TRUE;
1150 }
1151
1152 #endif /* WITH_CONTENT_SCAN */
1153
1154
1155 /*************************************************
1156 * Receive message *
1157 *************************************************/
1158
1159 /* Receive a message on the given input, and put it into a pair of spool files.
1160 Either a non-null list of recipients, or the extract flag will be true, or
1161 both. The flag sender_local is true for locally generated messages. The flag
1162 submission_mode is true if an ACL has obeyed "control = submission". The flag
1163 suppress_local_fixups is true if an ACL has obeyed "control =
1164 suppress_local_fixups". The flag smtp_input is true if the message is to be
1165 handled using SMTP conventions about termination and lines starting with dots.
1166 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1167
1168 If a message was successfully read, message_id[0] will be non-zero.
1169
1170 The general actions of this function are:
1171
1172 . Read the headers of the message (if any) into a chain of store
1173 blocks.
1174
1175 . If there is a "sender:" header and the message is locally originated,
1176 throw it away, unless the caller is trusted, or unless
1177 active_local_sender_retain is set - which can only happen if
1178 active_local_from_check is false.
1179
1180 . If recipients are to be extracted from the message, build the
1181 recipients list from the headers, removing any that were on the
1182 original recipients list (unless extract_addresses_remove_arguments is
1183 false), and at the same time, remove any bcc header that may be present.
1184
1185 . Get the spool file for the data, sort out its unique name, open
1186 and lock it (but don't give it the name yet).
1187
1188 . Generate a "Message-Id" header if the message doesn't have one, for
1189 locally-originated messages.
1190
1191 . Generate a "Received" header.
1192
1193 . Ensure the recipients list is fully qualified and rewritten if necessary.
1194
1195 . If there are any rewriting rules, apply them to the sender address
1196 and also to the headers.
1197
1198 . If there is no from: header, generate one, for locally-generated messages
1199 and messages in "submission mode" only.
1200
1201 . If the sender is local, check that from: is correct, and if not, generate
1202 a Sender: header, unless message comes from a trusted caller, or this
1203 feature is disabled by active_local_from_check being false.
1204
1205 . If there is no "date" header, generate one, for locally-originated
1206 or submission mode messages only.
1207
1208 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1209 dot_ends mode, to the data file. Leave it open, to hold the lock.
1210
1211 . Write the envelope and the headers to a new file.
1212
1213 . Set the name for the header file; close it.
1214
1215 . Set the name for the data file; close it.
1216
1217 Because this function can potentially be called many times in a single
1218 SMTP connection, all store should be got by store_get(), so that it will be
1219 automatically retrieved after the message is accepted.
1220
1221 FUDGE: It seems that sites on the net send out messages with just LF
1222 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1223 we make the CRs optional in all cases.
1224
1225 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1226 new regime is now in place in which bare CRs in header lines are turned into LF
1227 followed by a space, so as not to terminate the header line.
1228
1229 February 2004: A bare LF in a header line in a message whose first line was
1230 terminated by CRLF is treated in the same way as a bare CR.
1231
1232 Arguments:
1233 extract_recip TRUE if recipients are to be extracted from the message's
1234 headers
1235
1236 Returns: TRUE there are more messages to be read (SMTP input)
1237 FALSE there are no more messages to be read (non-SMTP input
1238 or SMTP connection collapsed, or other failure)
1239
1240 When reading a message for filter testing, the returned value indicates
1241 whether the headers (which is all that is read) were terminated by '.' or
1242 not. */
1243
1244 BOOL
1245 receive_msg(BOOL extract_recip)
1246 {
1247 int i, rc;
1248 int msg_size = 0;
1249 int process_info_len = Ustrlen(process_info);
1250 int error_rc = (error_handling == ERRORS_SENDER)?
1251 errors_sender_rc : EXIT_FAILURE;
1252 int header_size = 256;
1253 int start, end, domain, size, sptr;
1254 int id_resolution;
1255 int had_zero = 0;
1256
1257 register int ptr = 0;
1258
1259 BOOL contains_resent_headers = FALSE;
1260 BOOL extracted_ignored = FALSE;
1261 BOOL first_line_ended_crlf = TRUE_UNSET;
1262 BOOL smtp_yield = TRUE;
1263 BOOL yield = FALSE;
1264
1265 BOOL resents_exist = FALSE;
1266 uschar *resent_prefix = US"";
1267 uschar *blackholed_by = NULL;
1268 uschar *blackhole_log_msg = US"";
1269
1270 flock_t lock_data;
1271 error_block *bad_addresses = NULL;
1272
1273 uschar *frozen_by = NULL;
1274 uschar *queued_by = NULL;
1275
1276 uschar *errmsg, *s;
1277 struct stat statbuf;
1278
1279 /* Final message to give to SMTP caller */
1280
1281 uschar *smtp_reply = NULL;
1282
1283 /* Working header pointers */
1284
1285 header_line *h, *next;
1286
1287 /* Flags for noting the existence of certain headers */
1288
1289 /**** No longer check for these (Nov 2003)
1290 BOOL to_or_cc_header_exists = FALSE;
1291 BOOL bcc_header_exists = FALSE;
1292 ****/
1293
1294 BOOL date_header_exists = FALSE;
1295
1296 /* Pointers to receive the addresses of headers whose contents we need. */
1297
1298 header_line *from_header = NULL;
1299 header_line *subject_header = NULL;
1300 header_line *msgid_header = NULL;
1301 header_line *received_header;
1302
1303 /* Variables for use when building the Received: header. */
1304
1305 uschar *received;
1306 uschar *timestamp;
1307 int tslen;
1308
1309 /* Release any open files that might have been cached while preparing to
1310 accept the message - e.g. by verifying addresses - because reading a message
1311 might take a fair bit of real time. */
1312
1313 search_tidyup();
1314
1315 /* Initialize the chain of headers by setting up a place-holder for Received:
1316 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1317 pointing to the end of the chain to make adding headers simple. */
1318
1319 received_header = header_list = header_last = store_get(sizeof(header_line));
1320 header_list->next = NULL;
1321 header_list->type = htype_old;
1322 header_list->text = NULL;
1323 header_list->slen = 0;
1324
1325 /* Control block for the next header to be read. */
1326
1327 next = store_get(sizeof(header_line));
1328 next->text = store_get(header_size);
1329
1330 /* Initialize message id to be null (indicating no message read), and the
1331 header names list to be the normal list. Indicate there is no data file open
1332 yet, initialize the size and warning count, and deal with no size limit. */
1333
1334 message_id[0] = 0;
1335 data_file = NULL;
1336 data_fd = -1;
1337 spool_name[0] = 0;
1338 message_size = 0;
1339 warning_count = 0;
1340 received_count = 1; /* For the one we will add */
1341
1342 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1343
1344 /* While reading the message, the following counts are computed. */
1345
1346 message_linecount = body_linecount = body_zerocount = 0;
1347
1348 #ifdef EXPERIMENTAL_DOMAINKEYS
1349 /* Call into DK to set up the context. Check if DK is to be run are carried out
1350 inside dk_exim_verify_init(). */
1351 dk_exim_verify_init();
1352 #endif
1353
1354 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1355 ids, and fractions of a second are required. See the comments that precede the
1356 message id creation below. */
1357
1358 (void)gettimeofday(&message_id_tv, NULL);
1359
1360 /* For other uses of the received time we can operate with granularity of one
1361 second, and for that we use the global variable received_time. This is for
1362 things like ultimate message timeouts. */
1363
1364 received_time = message_id_tv.tv_sec;
1365
1366 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1367 happen in the smtp_getc() function when it refills its buffer. */
1368
1369 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1370
1371 /* If not SMTP input, timeout happens only if configured, and we just set a
1372 single timeout for the whole message. */
1373
1374 else if (receive_timeout > 0)
1375 {
1376 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1377 alarm(receive_timeout);
1378 }
1379
1380 /* SIGTERM and SIGINT are caught always. */
1381
1382 signal(SIGTERM, data_sigterm_sigint_handler);
1383 signal(SIGINT, data_sigterm_sigint_handler);
1384
1385 /* Header lines in messages are not supposed to be very long, though when
1386 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1387 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1388 storing the header, and extend this as necessary using string_cat().
1389
1390 To cope with total lunacies, impose an upper limit on the length of the header
1391 section of the message, as otherwise the store will fill up. We must also cope
1392 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1393 Folded header lines are joined into one string, leaving the '\n' characters
1394 inside them, so that writing them out reproduces the input.
1395
1396 Loop for each character of each header; the next structure for chaining the
1397 header is set up already, with ptr the offset of the next character in
1398 next->text. */
1399
1400 for (;;)
1401 {
1402 int ch = (RECEIVE_GETC)();
1403
1404 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1405 SMTP must have a correct "." terminator. */
1406
1407 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1408 {
1409 smtp_reply = handle_lost_connection(US" (header)");
1410 smtp_yield = FALSE;
1411 goto TIDYUP; /* Skip to end of function */
1412 }
1413
1414 /* See if we are at the current header's size limit - there must be at least
1415 four bytes left. This allows for the new character plus a zero, plus two for
1416 extra insertions when we are playing games with dots and carriage returns. If
1417 we are at the limit, extend the text buffer. This could have been done
1418 automatically using string_cat() but because this is a tightish loop storing
1419 only one character at a time, we choose to do it inline. Normally
1420 store_extend() will be able to extend the block; only at the end of a big
1421 store block will a copy be needed. To handle the case of very long headers
1422 (and sometimes lunatic messages can have ones that are 100s of K long) we
1423 call store_release() for strings that have been copied - if the string is at
1424 the start of a block (and therefore the only thing in it, because we aren't
1425 doing any other gets), the block gets freed. We can only do this because we
1426 know there are no other calls to store_get() going on. */
1427
1428 if (ptr >= header_size - 4)
1429 {
1430 int oldsize = header_size;
1431 /* header_size += 256; */
1432 header_size *= 2;
1433 if (!store_extend(next->text, oldsize, header_size))
1434 {
1435 uschar *newtext = store_get(header_size);
1436 memcpy(newtext, next->text, ptr);
1437 store_release(next->text);
1438 next->text = newtext;
1439 }
1440 }
1441
1442 /* Cope with receiving a binary zero. There is dispute about whether
1443 these should be allowed in RFC 822 messages. The middle view is that they
1444 should not be allowed in headers, at least. Exim takes this attitude at
1445 the moment. We can't just stomp on them here, because we don't know that
1446 this line is a header yet. Set a flag to cause scanning later. */
1447
1448 if (ch == 0) had_zero++;
1449
1450 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1451 those from data files use just LF. Treat LF in local SMTP input as a
1452 terminator too. Treat EOF as a line terminator always. */
1453
1454 if (ch == EOF) goto EOL;
1455
1456 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1457 other MTAs accept this. We are therefore forced into this "liberalisation"
1458 too, so we accept LF as a line terminator whatever the source of the message.
1459 However, if the first line of the message ended with a CRLF, we treat a bare
1460 LF specially by inserting a white space after it to ensure that the header
1461 line is not terminated. */
1462
1463 if (ch == '\n')
1464 {
1465 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1466 else if (first_line_ended_crlf) RECEIVE_UNGETC(' ');
1467 goto EOL;
1468 }
1469
1470 /* This is not the end of the line. If this is SMTP input and this is
1471 the first character in the line and it is a "." character, ignore it.
1472 This implements the dot-doubling rule, though header lines starting with
1473 dots aren't exactly common. They are legal in RFC 822, though. If the
1474 following is CRLF or LF, this is the line that that terminates the
1475 entire message. We set message_ended to indicate this has happened (to
1476 prevent further reading), and break out of the loop, having freed the
1477 empty header, and set next = NULL to indicate no data line. */
1478
1479 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1480 {
1481 ch = (RECEIVE_GETC)();
1482 if (ch == '\r')
1483 {
1484 ch = (RECEIVE_GETC)();
1485 if (ch != '\n')
1486 {
1487 RECEIVE_UNGETC(ch);
1488 ch = '\r'; /* Revert to CR */
1489 }
1490 }
1491 if (ch == '\n')
1492 {
1493 message_ended = END_DOT;
1494 store_reset(next);
1495 next = NULL;
1496 break; /* End character-reading loop */
1497 }
1498
1499 /* For non-SMTP input, the dot at the start of the line was really a data
1500 character. What is now in ch is the following character. We guaranteed
1501 enough space for this above. */
1502
1503 if (!smtp_input)
1504 {
1505 next->text[ptr++] = '.';
1506 message_size++;
1507 }
1508 }
1509
1510 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1511 remember this case if this is the first line ending. */
1512
1513 if (ch == '\r')
1514 {
1515 ch = (RECEIVE_GETC)();
1516 if (ch == '\n')
1517 {
1518 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1519 goto EOL;
1520 }
1521
1522 /* Otherwise, put back the character after CR, and turn the bare CR
1523 into LF SP. */
1524
1525 ch = (RECEIVE_UNGETC)(ch);
1526 next->text[ptr++] = '\n';
1527 message_size++;
1528 ch = ' ';
1529 }
1530
1531 /* We have a data character for the header line. */
1532
1533 next->text[ptr++] = ch; /* Add to buffer */
1534 message_size++; /* Total message size so far */
1535
1536 /* Handle failure due to a humungously long header section. The >= allows
1537 for the terminating \n. Add what we have so far onto the headers list so
1538 that it gets reflected in any error message, and back up the just-read
1539 character. */
1540
1541 if (message_size >= header_maxsize)
1542 {
1543 next->text[ptr] = 0;
1544 next->slen = ptr;
1545 next->type = htype_other;
1546 next->next = NULL;
1547 header_last->next = next;
1548 header_last = next;
1549
1550 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1551 "%s (more than %d characters): message abandoned",
1552 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1553
1554 if (smtp_input)
1555 {
1556 smtp_reply = US"552 Message header is ridiculously long";
1557 receive_swallow_smtp();
1558 goto TIDYUP; /* Skip to end of function */
1559 }
1560
1561 else
1562 {
1563 give_local_error(ERRMESS_VLONGHEADER,
1564 string_sprintf("message header longer than %d characters received: "
1565 "message not accepted", header_maxsize), US"", error_rc, stdin,
1566 header_list->next);
1567 /* Does not return */
1568 }
1569 }
1570
1571 continue; /* With next input character */
1572
1573 /* End of header line reached */
1574
1575 EOL:
1576
1577 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1578
1579 receive_linecount++;
1580 message_linecount++;
1581
1582 /* Now put in the terminating newline. There is always space for
1583 at least two more characters. */
1584
1585 next->text[ptr++] = '\n';
1586 message_size++;
1587
1588 /* A blank line signals the end of the headers; release the unwanted
1589 space and set next to NULL to indicate this. */
1590
1591 if (ptr == 1)
1592 {
1593 store_reset(next);
1594 next = NULL;
1595 break;
1596 }
1597
1598 /* There is data in the line; see if the next input character is a
1599 whitespace character. If it is, we have a continuation of this header line.
1600 There is always space for at least one character at this point. */
1601
1602 if (ch != EOF)
1603 {
1604 int nextch = (RECEIVE_GETC)();
1605 if (nextch == ' ' || nextch == '\t')
1606 {
1607 next->text[ptr++] = nextch;
1608 message_size++;
1609 continue; /* Iterate the loop */
1610 }
1611 else if (nextch != EOF) (RECEIVE_UNGETC)(nextch); /* For next time */
1612 else ch = EOF; /* Cause main loop to exit at end */
1613 }
1614
1615 /* We have got to the real line end. Terminate the string and release store
1616 beyond it. If it turns out to be a real header, internal binary zeros will
1617 be squashed later. */
1618
1619 next->text[ptr] = 0;
1620 next->slen = ptr;
1621 store_reset(next->text + ptr + 1);
1622
1623 /* Check the running total size against the overall message size limit. We
1624 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1625 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1626 headers - the code to read the body will then also hit the buffer. */
1627
1628 if (message_size > thismessage_size_limit) break;
1629
1630 /* A line that is not syntactically correct for a header also marks
1631 the end of the headers. In this case, we leave next containing the
1632 first data line. This might actually be several lines because of the
1633 continuation logic applied above, but that doesn't matter.
1634
1635 It turns out that smail, and presumably sendmail, accept leading lines
1636 of the form
1637
1638 From ph10 Fri Jan 5 12:35 GMT 1996
1639
1640 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1641 find any documentation of this, but for compatibility it had better be
1642 accepted. Exim restricts it to the case of non-smtp messages, and
1643 treats it as an alternative to the -f command line option. Thus it is
1644 ignored except for trusted users or filter testing. Otherwise it is taken
1645 as the sender address, unless -f was used (sendmail compatibility).
1646
1647 It further turns out that some UUCPs generate the From_line in a different
1648 format, e.g.
1649
1650 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1651
1652 The regex for matching these things is now capable of recognizing both
1653 formats (including 2- and 4-digit years in the latter). In fact, the regex
1654 is now configurable, as is the expansion string to fish out the sender.
1655
1656 Even further on it has been discovered that some broken clients send
1657 these lines in SMTP messages. There is now an option to ignore them from
1658 specified hosts or networks. Sigh. */
1659
1660 if (header_last == header_list &&
1661 (!smtp_input
1662 ||
1663 (sender_host_address != NULL &&
1664 verify_check_host(&ignore_fromline_hosts) == OK)
1665 ||
1666 (sender_host_address == NULL && ignore_fromline_local)
1667 ) &&
1668 regex_match_and_setup(regex_From, next->text, 0, -1))
1669 {
1670 if (!sender_address_forced)
1671 {
1672 uschar *uucp_sender = expand_string(uucp_from_sender);
1673 if (uucp_sender == NULL)
1674 {
1675 log_write(0, LOG_MAIN|LOG_PANIC,
1676 "expansion of \"%s\" failed after matching "
1677 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1678 }
1679 else
1680 {
1681 int start, end, domain;
1682 uschar *errmess;
1683 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1684 &start, &end, &domain, TRUE);
1685 if (newsender != NULL)
1686 {
1687 if (domain == 0 && newsender[0] != 0)
1688 newsender = rewrite_address_qualify(newsender, FALSE);
1689
1690 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1691 {
1692 sender_address = newsender;
1693
1694 if (trusted_caller || filter_test != FTEST_NONE)
1695 {
1696 authenticated_sender = NULL;
1697 originator_name = US"";
1698 sender_local = FALSE;
1699 }
1700
1701 if (filter_test != FTEST_NONE)
1702 printf("Sender taken from \"From \" line\n");
1703 }
1704 }
1705 }
1706 }
1707 }
1708
1709 /* Not a leading "From " line. Check to see if it is a valid header line.
1710 Header names may contain any non-control characters except space and colon,
1711 amazingly. */
1712
1713 else
1714 {
1715 uschar *p = next->text;
1716
1717 /* If not a valid header line, break from the header reading loop, leaving
1718 next != NULL, indicating that it holds the first line of the body. */
1719
1720 if (isspace(*p)) break;
1721 while (mac_isgraph(*p) && *p != ':') p++;
1722 while (isspace(*p)) p++;
1723 if (*p != ':')
1724 {
1725 body_zerocount = had_zero;
1726 break;
1727 }
1728
1729 /* We have a valid header line. If there were any binary zeroes in
1730 the line, stomp on them here. */
1731
1732 if (had_zero > 0)
1733 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1734
1735 /* It is perfectly legal to have an empty continuation line
1736 at the end of a header, but it is confusing to humans
1737 looking at such messages, since it looks like a blank line.
1738 Reduce confusion by removing redundant white space at the
1739 end. We know that there is at least one printing character
1740 (the ':' tested for above) so there is no danger of running
1741 off the end. */
1742
1743 p = next->text + ptr - 2;
1744 for (;;)
1745 {
1746 while (*p == ' ' || *p == '\t') p--;
1747 if (*p != '\n') break;
1748 ptr = (p--) - next->text + 1;
1749 message_size -= next->slen - ptr;
1750 next->text[ptr] = 0;
1751 next->slen = ptr;
1752 }
1753
1754 /* Add the header to the chain */
1755
1756 next->type = htype_other;
1757 next->next = NULL;
1758 header_last->next = next;
1759 header_last = next;
1760
1761 /* Check the limit for individual line lengths. This comes after adding to
1762 the chain so that the failing line is reflected if a bounce is generated
1763 (for a local message). */
1764
1765 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1766 {
1767 log_write(0, LOG_MAIN, "overlong message header line received from "
1768 "%s (more than %d characters): message abandoned",
1769 sender_host_unknown? sender_ident : sender_fullhost,
1770 header_line_maxsize);
1771
1772 if (smtp_input)
1773 {
1774 smtp_reply = US"552 A message header line is too long";
1775 receive_swallow_smtp();
1776 goto TIDYUP; /* Skip to end of function */
1777 }
1778
1779 else
1780 {
1781 give_local_error(ERRMESS_VLONGHDRLINE,
1782 string_sprintf("message header line longer than %d characters "
1783 "received: message not accepted", header_line_maxsize), US"",
1784 error_rc, stdin, header_list->next);
1785 /* Does not return */
1786 }
1787 }
1788
1789 /* Note if any resent- fields exist. */
1790
1791 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1792 {
1793 resents_exist = TRUE;
1794 resent_prefix = US"Resent-";
1795 }
1796 }
1797
1798 /* The line has been handled. If we have hit EOF, break out of the loop,
1799 indicating no pending data line. */
1800
1801 if (ch == EOF) { next = NULL; break; }
1802
1803 /* Set up for the next header */
1804
1805 header_size = 256;
1806 next = store_get(sizeof(header_line));
1807 next->text = store_get(header_size);
1808 ptr = 0;
1809 had_zero = 0;
1810 } /* Continue, starting to read the next header */
1811
1812 /* At this point, we have read all the headers into a data structure in main
1813 store. The first header is still the dummy placeholder for the Received: header
1814 we are going to generate a bit later on. If next != NULL, it contains the first
1815 data line - which terminated the headers before reaching a blank line (not the
1816 normal case). */
1817
1818 DEBUG(D_receive)
1819 {
1820 debug_printf(">>Headers received:\n");
1821 for (h = header_list->next; h != NULL; h = h->next)
1822 debug_printf("%s", h->text);
1823 debug_printf("\n");
1824 }
1825
1826 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1827 is dropped immediately after valid headers, the next thing we will see is EOF.
1828 We must test for this specially, as further down the reading of the data is
1829 skipped if already at EOF. */
1830
1831 if (smtp_input && (receive_feof)())
1832 {
1833 smtp_reply = handle_lost_connection(US" (after header)");
1834 smtp_yield = FALSE;
1835 goto TIDYUP; /* Skip to end of function */
1836 }
1837
1838 /* If this is a filter test run and no headers were read, output a warning
1839 in case there is a mistake in the test message. */
1840
1841 if (filter_test != FTEST_NONE && header_list->next == NULL)
1842 printf("Warning: no message headers read\n");
1843
1844
1845 /* Scan the headers to identify them. Some are merely marked for later
1846 processing; some are dealt with here. */
1847
1848 for (h = header_list->next; h != NULL; h = h->next)
1849 {
1850 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1851 if (is_resent) contains_resent_headers = TRUE;
1852
1853 switch (header_checkname(h, is_resent))
1854 {
1855 /* "Bcc:" gets flagged, and its existence noted, whether it's resent- or
1856 not. */
1857
1858 case htype_bcc:
1859 h->type = htype_bcc;
1860 /****
1861 bcc_header_exists = TRUE;
1862 ****/
1863 break;
1864
1865 /* "Cc:" gets flagged, and the existence of a recipient header is noted,
1866 whether it's resent- or not. */
1867
1868 case htype_cc:
1869 h->type = htype_cc;
1870 /****
1871 to_or_cc_header_exists = TRUE;
1872 ****/
1873 break;
1874
1875 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1876
1877 case htype_date:
1878 date_header_exists = !resents_exist || is_resent;
1879 break;
1880
1881 /* Same comments as about Return-Path: below. */
1882
1883 case htype_delivery_date:
1884 if (delivery_date_remove) h->type = htype_old;
1885 break;
1886
1887 /* Same comments as about Return-Path: below. */
1888
1889 case htype_envelope_to:
1890 if (envelope_to_remove) h->type = htype_old;
1891 break;
1892
1893 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1894 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1895 header consists of just the login id of the user who called Exim, rewrite
1896 it with the gecos field first. Apply this rule to Resent-From: if there
1897 are resent- fields. */
1898
1899 case htype_from:
1900 h->type = htype_from;
1901 if (!resents_exist || is_resent)
1902 {
1903 from_header = h;
1904 if (!smtp_input)
1905 {
1906 uschar *s = Ustrchr(h->text, ':') + 1;
1907 while (isspace(*s)) s++;
1908 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1909 {
1910 uschar *name = is_resent? US"Resent-From" : US"From";
1911 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1912 originator_login, qualify_domain_sender);
1913 from_header = header_last;
1914 h->type = htype_old;
1915 DEBUG(D_receive|D_rewrite)
1916 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1917 }
1918 }
1919 }
1920 break;
1921
1922 /* Identify the Message-id: header for generating "in-reply-to" in the
1923 autoreply transport. For incoming logging, save any resent- value. In both
1924 cases, take just the first of any multiples. */
1925
1926 case htype_id:
1927 if (msgid_header == NULL && (!resents_exist || is_resent))
1928 {
1929 msgid_header = h;
1930 h->type = htype_id;
1931 }
1932 break;
1933
1934 /* Flag all Received: headers */
1935
1936 case htype_received:
1937 h->type = htype_received;
1938 received_count++;
1939 break;
1940
1941 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1942
1943 case htype_reply_to:
1944 h->type = htype_reply_to;
1945 break;
1946
1947 /* The Return-path: header is supposed to be added to messages when
1948 they leave the SMTP system. We shouldn't receive messages that already
1949 contain Return-path. However, since Exim generates Return-path: on
1950 local delivery, resent messages may well contain it. We therefore
1951 provide an option (which defaults on) to remove any Return-path: headers
1952 on input. Removal actually means flagging as "old", which prevents the
1953 header being transmitted with the message. */
1954
1955 case htype_return_path:
1956 if (return_path_remove) h->type = htype_old;
1957
1958 /* If we are testing a mail filter file, use the value of the
1959 Return-Path: header to set up the return_path variable, which is not
1960 otherwise set. However, remove any <> that surround the address
1961 because the variable doesn't have these. */
1962
1963 if (filter_test != FTEST_NONE)
1964 {
1965 uschar *start = h->text + 12;
1966 uschar *end = start + Ustrlen(start);
1967 while (isspace(*start)) start++;
1968 while (end > start && isspace(end[-1])) end--;
1969 if (*start == '<' && end[-1] == '>')
1970 {
1971 start++;
1972 end--;
1973 }
1974 return_path = string_copyn(start, end - start);
1975 printf("Return-path taken from \"Return-path:\" header line\n");
1976 }
1977 break;
1978
1979 /* If there is a "Sender:" header and the message is locally originated,
1980 and from an untrusted caller and suppress_local_fixups is not set, or if we
1981 are in submission mode for a remote message, mark it "old" so that it will
1982 not be transmitted with the message, unless active_local_sender_retain is
1983 set. (This can only be true if active_local_from_check is false.) If there
1984 are any resent- headers in the message, apply this rule to Resent-Sender:
1985 instead of Sender:. Messages with multiple resent- header sets cannot be
1986 tidily handled. (For this reason, at least one MUA - Pine - turns old
1987 resent- headers into X-resent- headers when resending, leaving just one
1988 set.) */
1989
1990 case htype_sender:
1991 h->type = ((!active_local_sender_retain &&
1992 (
1993 (sender_local && !trusted_caller && !suppress_local_fixups)
1994 || submission_mode
1995 )
1996 ) &&
1997 (!resents_exist||is_resent))?
1998 htype_old : htype_sender;
1999 break;
2000
2001 /* Remember the Subject: header for logging. There is no Resent-Subject */
2002
2003 case htype_subject:
2004 subject_header = h;
2005 break;
2006
2007 /* "To:" gets flagged, and the existence of a recipient header is noted,
2008 whether it's resent- or not. */
2009
2010 case htype_to:
2011 h->type = htype_to;
2012 /****
2013 to_or_cc_header_exists = TRUE;
2014 ****/
2015 break;
2016 }
2017 }
2018
2019 /* Extract recipients from the headers if that is required (the -t option).
2020 Note that this is documented as being done *before* any address rewriting takes
2021 place. There are two possibilities:
2022
2023 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2024 recipients already listed are to be REMOVED from the message. Smail 3 works
2025 like this. We need to build a non-recipients tree for that list, because in
2026 subsequent processing this data is held in a tree and that's what the
2027 spool_write_header() function expects. Make sure that non-recipient addresses
2028 are fully qualified and rewritten if necessary.
2029
2030 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2031 those in the command line arguments (and it is rumoured some other MTAs do
2032 this). Therefore, there is an option to make Exim behave this way.
2033
2034 *** Notes on "Resent-" header lines ***
2035
2036 The presence of resent-headers in the message makes -t horribly ambiguous.
2037 Experiments with sendmail showed that it uses recipients for all resent-
2038 headers, totally ignoring the concept of "sets of resent- headers" as described
2039 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2040 with all the addresses in one instance of each header.
2041
2042 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2043 error for -t if there were resent- headers in the message. However, after a
2044 discussion on the mailing list, I've learned that there are MUAs that use
2045 resent- headers with -t, and also that the stuff about sets of resent- headers
2046 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2047 message with -t and resent- header lines makes sure that only *its* resent-
2048 headers are present; previous ones are often renamed as X-resent- for example.
2049
2050 Consequently, Exim has been changed so that, if any resent- header lines are
2051 present, the recipients are taken from all of the appropriate resent- lines,
2052 and not from the ordinary To:, Cc:, etc. */
2053
2054 if (extract_recip)
2055 {
2056 int rcount = 0;
2057 error_block **bnext = &bad_addresses;
2058
2059 if (extract_addresses_remove_arguments)
2060 {
2061 while (recipients_count-- > 0)
2062 {
2063 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2064 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2065 tree_add_nonrecipient(s);
2066 }
2067 recipients_list = NULL;
2068 recipients_count = recipients_list_max = 0;
2069 }
2070
2071 parse_allow_group = TRUE; /* Allow address group syntax */
2072
2073 /* Now scan the headers */
2074
2075 for (h = header_list->next; h != NULL; h = h->next)
2076 {
2077 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2078 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2079 {
2080 uschar *s = Ustrchr(h->text, ':') + 1;
2081 while (isspace(*s)) s++;
2082
2083 while (*s != 0)
2084 {
2085 uschar *ss = parse_find_address_end(s, FALSE);
2086 uschar *recipient, *errmess, *p, *pp;
2087 int start, end, domain;
2088
2089 /* Check on maximum */
2090
2091 if (recipients_max > 0 && ++rcount > recipients_max)
2092 {
2093 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2094 US"message rejected: ", error_rc, stdin, NULL);
2095 /* Does not return */
2096 }
2097
2098 /* Make a copy of the address, and remove any internal newlines. These
2099 may be present as a result of continuations of the header line. The
2100 white space that follows the newline must not be removed - it is part
2101 of the header. */
2102
2103 pp = recipient = store_get(ss - s + 1);
2104 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2105 *pp = 0;
2106 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2107 &domain, FALSE);
2108
2109 /* Keep a list of all the bad addresses so we can send a single
2110 error message at the end. However, an empty address is not an error;
2111 just ignore it. This can come from an empty group list like
2112
2113 To: Recipients of list:;
2114
2115 If there are no recipients at all, an error will occur later. */
2116
2117 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2118 {
2119 int len = Ustrlen(s);
2120 error_block *b = store_get(sizeof(error_block));
2121 while (len > 0 && isspace(s[len-1])) len--;
2122 b->next = NULL;
2123 b->text1 = string_printing(string_copyn(s, len));
2124 b->text2 = errmess;
2125 *bnext = b;
2126 bnext = &(b->next);
2127 }
2128
2129 /* If the recipient is already in the nonrecipients tree, it must
2130 have appeared on the command line with the option extract_addresses_
2131 remove_arguments set. Do not add it to the recipients, and keep a note
2132 that this has happened, in order to give a better error if there are
2133 no recipients left. */
2134
2135 else if (recipient != NULL)
2136 {
2137 if (tree_search(tree_nonrecipients, recipient) == NULL)
2138 receive_add_recipient(recipient, -1);
2139 else
2140 extracted_ignored = TRUE;
2141 }
2142
2143 /* Move on past this address */
2144
2145 s = ss + (*ss? 1:0);
2146 while (isspace(*s)) s++;
2147 }
2148
2149 /* If this was the bcc: header, mark it "old", which means it
2150 will be kept on the spool, but not transmitted as part of the
2151 message. */
2152
2153 if (h->type == htype_bcc)
2154 {
2155 h->type = htype_old;
2156 /****
2157 bcc_header_exists = FALSE;
2158 ****/
2159 }
2160 } /* For appropriate header line */
2161 } /* For each header line */
2162
2163 parse_allow_group = FALSE; /* Reset group syntax flags */
2164 parse_found_group = FALSE;
2165 }
2166
2167 /* Now build the unique message id. This has changed several times over the
2168 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2169 Retaining all the history in the comment has become too unwieldy - read
2170 previous release sources if you want it.
2171
2172 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2173 The first part is the current time, in seconds. The second part is the current
2174 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2175 can hold a number in the range 0-3843. It used to be a computed sequence
2176 number, but is now the fractional component of the current time in units of
2177 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2178 received, Exim ensures that the timer has ticked at the appropriate level
2179 before proceeding, to avoid duplication if the pid happened to be re-used
2180 within the same time period. It seems likely that most messages will take at
2181 least half a millisecond to be received, so no delay will normally be
2182 necessary. At least for some time...
2183
2184 There is a modification when localhost_number is set. Formerly this was allowed
2185 to be as large as 255. Now it is restricted to the range 0-16, and the final
2186 component of the message id becomes (localhost_number * 200) + fractional time
2187 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2188
2189 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2190 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2191 still allows the tttttt field to hold a large enough number to last for some
2192 more decades, and the final two-digit field can hold numbers up to 1295, which
2193 is enough for milliseconds (instead of 1/2000 of a second).
2194
2195 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2196 pid, so it is probably safe because pids have to be positive. The
2197 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2198 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2199
2200 Note that string_base62() returns its data in a static storage block, so it
2201 must be copied before calling string_base62() again. It always returns exactly
2202 6 characters.
2203
2204 There doesn't seem to be anything in the RFC which requires a message id to
2205 start with a letter, but Smail was changed to ensure this. The external form of
2206 the message id (as supplied by string expansion) therefore starts with an
2207 additional leading 'E'. The spool file names do not include this leading
2208 letter and it is not used internally.
2209
2210 NOTE: If ever the format of message ids is changed, the regular expression for
2211 checking that a string is in this format must be updated in a corresponding
2212 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2213 must also be changed to reflect the correct string length. Then, of course,
2214 other programs that rely on the message id format will need updating too. */
2215
2216 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2217 message_id[6] = '-';
2218 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2219
2220 /* Deal with the case where the host number is set. The value of the number was
2221 checked when it was read, to ensure it isn't too big. The timing granularity is
2222 left in id_resolution so that an appropriate wait can be done after receiving
2223 the message, if necessary (we hope it won't be). */
2224
2225 if (host_number_string != NULL)
2226 {
2227 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2228 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2229 string_base62((long int)(
2230 host_number * (1000000/id_resolution) +
2231 message_id_tv.tv_usec/id_resolution)) + 4);
2232 }
2233
2234 /* Host number not set: final field is just the fractional time at an
2235 appropriate resolution. */
2236
2237 else
2238 {
2239 id_resolution = (BASE_62 == 62)? 500 : 1000;
2240 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2241 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2242 }
2243
2244 /* Add the current message id onto the current process info string if
2245 it will fit. */
2246
2247 (void)string_format(process_info + process_info_len,
2248 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2249
2250 /* If we are using multiple input directories, set up the one for this message
2251 to be the least significant base-62 digit of the time of arrival. Otherwise
2252 ensure that it is an empty string. */
2253
2254 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2255
2256 /* Now that we have the message-id, if there is no message-id: header, generate
2257 one, but only for local (without suppress_local_fixups) or submission mode
2258 messages. This can be user-configured if required, but we had better flatten
2259 any illegal characters therein. */
2260
2261 if (msgid_header == NULL &&
2262 ((sender_host_address == NULL && !suppress_local_fixups)
2263 || submission_mode))
2264 {
2265 uschar *p;
2266 uschar *id_text = US"";
2267 uschar *id_domain = primary_hostname;
2268
2269 /* Permit only letters, digits, dots, and hyphens in the domain */
2270
2271 if (message_id_domain != NULL)
2272 {
2273 uschar *new_id_domain = expand_string(message_id_domain);
2274 if (new_id_domain == NULL)
2275 {
2276 if (!expand_string_forcedfail)
2277 log_write(0, LOG_MAIN|LOG_PANIC,
2278 "expansion of \"%s\" (message_id_header_domain) "
2279 "failed: %s", message_id_domain, expand_string_message);
2280 }
2281 else if (*new_id_domain != 0)
2282 {
2283 id_domain = new_id_domain;
2284 for (p = id_domain; *p != 0; p++)
2285 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2286 }
2287 }
2288
2289 /* Permit all characters except controls and RFC 2822 specials in the
2290 additional text part. */
2291
2292 if (message_id_text != NULL)
2293 {
2294 uschar *new_id_text = expand_string(message_id_text);
2295 if (new_id_text == NULL)
2296 {
2297 if (!expand_string_forcedfail)
2298 log_write(0, LOG_MAIN|LOG_PANIC,
2299 "expansion of \"%s\" (message_id_header_text) "
2300 "failed: %s", message_id_text, expand_string_message);
2301 }
2302 else if (*new_id_text != 0)
2303 {
2304 id_text = new_id_text;
2305 for (p = id_text; *p != 0; p++)
2306 if (mac_iscntrl_or_special(*p)) *p = '-';
2307 }
2308 }
2309
2310 /* Add the header line */
2311
2312 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2313 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2314 }
2315
2316 /* If we are to log recipients, keep a copy of the raw ones before any possible
2317 rewriting. Must copy the count, because later ACLs and the local_scan()
2318 function may mess with the real recipients. */
2319
2320 if ((log_extra_selector & LX_received_recipients) != 0)
2321 {
2322 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2323 for (i = 0; i < recipients_count; i++)
2324 raw_recipients[i] = string_copy(recipients_list[i].address);
2325 raw_recipients_count = recipients_count;
2326 }
2327
2328 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2329 recipients will get here only if the conditions were right (allow_unqualified_
2330 recipient is TRUE). */
2331
2332 for (i = 0; i < recipients_count; i++)
2333 recipients_list[i].address =
2334 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2335 global_rewrite_rules, rewrite_existflags);
2336
2337 /* If there is no From: header, generate one for local (without
2338 suppress_local_fixups) or submission_mode messages. If there is no sender
2339 address, but the sender is local or this is a local delivery error, use the
2340 originator login. This shouldn't happen for genuine bounces, but might happen
2341 for autoreplies. The addition of From: must be done *before* checking for the
2342 possible addition of a Sender: header, because untrusted_set_sender allows an
2343 untrusted user to set anything in the envelope (which might then get info
2344 From:) but we still want to ensure a valid Sender: if it is required. */
2345
2346 if (from_header == NULL &&
2347 ((sender_host_address == NULL && !suppress_local_fixups)
2348 || submission_mode))
2349 {
2350 uschar *oname = US"";
2351
2352 /* Use the originator_name if this is a locally submitted message and the
2353 caller is not trusted. For trusted callers, use it only if -F was used to
2354 force its value or if we have a non-SMTP message for which -f was not used
2355 to set the sender. */
2356
2357 if (sender_host_address == NULL)
2358 {
2359 if (!trusted_caller || sender_name_forced ||
2360 (!smtp_input && !sender_address_forced))
2361 oname = originator_name;
2362 }
2363
2364 /* For non-locally submitted messages, the only time we use the originator
2365 name is when it was forced by the /name= option on control=submission. */
2366
2367 else
2368 {
2369 if (submission_name != NULL) oname = submission_name;
2370 }
2371
2372 /* Envelope sender is empty */
2373
2374 if (sender_address[0] == 0)
2375 {
2376 uschar *fromstart, *fromend;
2377
2378 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2379 oname, (oname[0] == 0)? "" : " <");
2380 fromend = (oname[0] == 0)? US"" : US">";
2381
2382 if (sender_local || local_error_message)
2383 {
2384 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2385 local_part_quote(originator_login), qualify_domain_sender,
2386 fromend);
2387 }
2388 else if (submission_mode && authenticated_id != NULL)
2389 {
2390 if (submission_domain == NULL)
2391 {
2392 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2393 local_part_quote(authenticated_id), qualify_domain_sender,
2394 fromend);
2395 }
2396 else if (submission_domain[0] == 0) /* empty => whole address set */
2397 {
2398 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2399 fromend);
2400 }
2401 else
2402 {
2403 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2404 local_part_quote(authenticated_id), submission_domain,
2405 fromend);
2406 }
2407 from_header = header_last; /* To get it checked for Sender: */
2408 }
2409 }
2410
2411 /* There is a non-null envelope sender. Build the header using the original
2412 sender address, before any rewriting that might have been done while
2413 verifying it. */
2414
2415 else
2416 {
2417 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2418 oname,
2419 (oname[0] == 0)? "" : " <",
2420 (sender_address_unrewritten == NULL)?
2421 sender_address : sender_address_unrewritten,
2422 (oname[0] == 0)? "" : ">");
2423
2424 from_header = header_last; /* To get it checked for Sender: */
2425 }
2426 }
2427
2428
2429 /* If the sender is local (without suppress_local_fixups), or if we are in
2430 submission mode and there is an authenticated_id, check that an existing From:
2431 is correct, and if not, generate a Sender: header, unless disabled. Any
2432 previously-existing Sender: header was removed above. Note that sender_local,
2433 as well as being TRUE if the caller of exim is not trusted, is also true if a
2434 trusted caller did not supply a -f argument for non-smtp input. To allow
2435 trusted callers to forge From: without supplying -f, we have to test explicitly
2436 here. If the From: header contains more than one address, then the call to
2437 parse_extract_address fails, and a Sender: header is inserted, as required. */
2438
2439 if (from_header != NULL &&
2440 (active_local_from_check &&
2441 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2442 (submission_mode && authenticated_id != NULL))
2443 ))
2444 {
2445 BOOL make_sender = TRUE;
2446 int start, end, domain;
2447 uschar *errmess;
2448 uschar *from_address =
2449 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2450 &start, &end, &domain, FALSE);
2451 uschar *generated_sender_address;
2452
2453 if (submission_mode)
2454 {
2455 if (submission_domain == NULL)
2456 {
2457 generated_sender_address = string_sprintf("%s@%s",
2458 local_part_quote(authenticated_id), qualify_domain_sender);
2459 }
2460 else if (submission_domain[0] == 0) /* empty => full address */
2461 {
2462 generated_sender_address = string_sprintf("%s",
2463 authenticated_id);
2464 }
2465 else
2466 {
2467 generated_sender_address = string_sprintf("%s@%s",
2468 local_part_quote(authenticated_id), submission_domain);
2469 }
2470 }
2471 else
2472 generated_sender_address = string_sprintf("%s@%s",
2473 local_part_quote(originator_login), qualify_domain_sender);
2474
2475 /* Remove permitted prefixes and suffixes from the local part of the From:
2476 address before doing the comparison with the generated sender. */
2477
2478 if (from_address != NULL)
2479 {
2480 int slen;
2481 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2482
2483 if (at != NULL) *at = 0;
2484 from_address += route_check_prefix(from_address, local_from_prefix);
2485 slen = route_check_suffix(from_address, local_from_suffix);
2486 if (slen > 0)
2487 {
2488 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2489 from_address += slen;
2490 }
2491 if (at != NULL) *at = '@';
2492
2493 if (strcmpic(generated_sender_address, from_address) == 0 ||
2494 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2495 make_sender = FALSE;
2496 }
2497
2498 /* We have to cause the Sender header to be rewritten if there are
2499 appropriate rewriting rules. */
2500
2501 if (make_sender)
2502 {
2503 if (submission_mode && submission_name == NULL)
2504 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2505 generated_sender_address);
2506 else
2507 header_add(htype_sender, "%sSender: %s <%s>\n",
2508 resent_prefix,
2509 submission_mode? submission_name : originator_name,
2510 generated_sender_address);
2511 }
2512
2513 /* Ensure that a non-null envelope sender address corresponds to the
2514 submission mode sender address. */
2515
2516 if (submission_mode && sender_address[0] != 0)
2517 {
2518 if (sender_address_unrewritten == NULL)
2519 sender_address_unrewritten = sender_address;
2520 sender_address = generated_sender_address;
2521 log_write(L_address_rewrite, LOG_MAIN,
2522 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2523 sender_address_unrewritten, generated_sender_address);
2524 }
2525 }
2526
2527
2528 /* If there are any rewriting rules, apply them to the sender address, unless
2529 it has already been rewritten as part of verification for SMTP input. */
2530
2531 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2532 sender_address[0] != 0)
2533 {
2534 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2535 global_rewrite_rules, rewrite_existflags);
2536 DEBUG(D_receive|D_rewrite)
2537 debug_printf("rewritten sender = %s\n", sender_address);
2538 }
2539
2540
2541 /* The headers must be run through rewrite_header(), because it ensures that
2542 addresses are fully qualified, as well as applying any rewriting rules that may
2543 exist.
2544
2545 Qualification of header addresses in a message from a remote host happens only
2546 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2547 appropriate. For local messages, qualification always happens, unless -bnq is
2548 used to explicitly suppress it. No rewriting is done for an unqualified address
2549 that is left untouched.
2550
2551 We start at the second header, skipping our own Received:. This rewriting is
2552 documented as happening *after* recipient addresses are taken from the headers
2553 by the -t command line option. An added Sender: gets rewritten here. */
2554
2555 for (h = header_list->next; h != NULL; h = h->next)
2556 {
2557 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2558 rewrite_existflags, TRUE);
2559 if (newh != NULL) h = newh;
2560 }
2561
2562
2563 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2564 "cc", or "bcc". Note that although the minimal examples in RFC822 show just
2565 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2566 exists, this applies to the set of resent- headers rather than the normal set.
2567
2568 The requirement for a recipient header has been removed in RFC 2822. Earlier
2569 versions of Exim added a To: header for locally submitted messages, and an
2570 empty Bcc: header for others or when always_bcc was set. In the light of the
2571 changes in RFC 2822, we now always add Bcc: just in case there are still MTAs
2572 out there that insist on the RFC 822 syntax.
2573
2574 November 2003: While generally revising what Exim does to fix up headers, it
2575 seems like a good time to remove this altogether. */
2576
2577 /******
2578 if (!to_or_cc_header_exists && !bcc_header_exists)
2579 header_add(htype_bcc, "Bcc:\n");
2580 ******/
2581
2582 /* If there is no date header, generate one if the message originates locally
2583 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2584 submission mode flag is set. Messages without Date: are not valid, but it seems
2585 to be more confusing if Exim adds one to all remotely-originated messages. */
2586
2587 if (!date_header_exists &&
2588 ((sender_host_address == NULL && !suppress_local_fixups)
2589 || submission_mode))
2590 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2591
2592 search_tidyup(); /* Free any cached resources */
2593
2594 /* Show the complete set of headers if debugging. Note that the first one (the
2595 new Received:) has not yet been set. */
2596
2597 DEBUG(D_receive)
2598 {
2599 debug_printf(">>Headers after rewriting and local additions:\n");
2600 for (h = header_list->next; h != NULL; h = h->next)
2601 debug_printf("%c %s", h->type, h->text);
2602 debug_printf("\n");
2603 }
2604
2605 /* The headers are now complete in store. If we are running in filter
2606 testing mode, that is all this function does. Return TRUE if the message
2607 ended with a dot. */
2608
2609 if (filter_test != FTEST_NONE)
2610 {
2611 process_info[process_info_len] = 0;
2612 return message_ended == END_DOT;
2613 }
2614
2615 /* Open a new spool file for the data portion of the message. We need
2616 to access it both via a file descriptor and a stream. Try to make the
2617 directory if it isn't there. Note re use of sprintf: spool_directory
2618 is checked on input to be < 200 characters long. */
2619
2620 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2621 message_id);
2622 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2623 if (data_fd < 0)
2624 {
2625 if (errno == ENOENT)
2626 {
2627 uschar temp[16];
2628 sprintf(CS temp, "input/%s", message_subdir);
2629 if (message_subdir[0] == 0) temp[5] = 0;
2630 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2631 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2632 }
2633 if (data_fd < 0)
2634 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2635 spool_name, strerror(errno));
2636 }
2637
2638 /* Make sure the file's group is the Exim gid, and double-check the mode
2639 because the group setting doesn't always get set automatically. */
2640
2641 (void)fchown(data_fd, exim_uid, exim_gid);
2642 (void)fchmod(data_fd, SPOOL_MODE);
2643
2644 /* We now have data file open. Build a stream for it and lock it. We lock only
2645 the first line of the file (containing the message ID) because otherwise there
2646 are problems when Exim is run under Cygwin (I'm told). See comments in
2647 spool_in.c, where the same locking is done. */
2648
2649 data_file = fdopen(data_fd, "w+");
2650 lock_data.l_type = F_WRLCK;
2651 lock_data.l_whence = SEEK_SET;
2652 lock_data.l_start = 0;
2653 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2654
2655 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2656 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2657 errno, strerror(errno));
2658
2659 /* We have an open, locked data file. Write the message id to it to make it
2660 self-identifying. Then read the remainder of the input of this message and
2661 write it to the data file. If the variable next != NULL, it contains the first
2662 data line (which was read as a header but then turned out not to have the right
2663 format); write it (remembering that it might contain binary zeros). The result
2664 of fwrite() isn't inspected; instead we call ferror() below. */
2665
2666 fprintf(data_file, "%s-D\n", message_id);
2667 if (next != NULL)
2668 {
2669 uschar *s = next->text;
2670 int len = next->slen;
2671 (void)fwrite(s, 1, len, data_file);
2672 body_linecount++; /* Assumes only 1 line */
2673 }
2674
2675 /* Note that we might already be at end of file, or the logical end of file
2676 (indicated by '.'), or might have encountered an error while writing the
2677 message id or "next" line. */
2678
2679 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2680 {
2681 if (smtp_input)
2682 {
2683 message_ended = read_message_data_smtp(data_file);
2684 receive_linecount++; /* The terminating "." line */
2685 }
2686 else message_ended = read_message_data(data_file);
2687
2688 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2689 message_linecount += body_linecount;
2690
2691 /* Handle premature termination of SMTP */
2692
2693 if (smtp_input && message_ended == END_EOF)
2694 {
2695 Uunlink(spool_name); /* Lose data file when closed */
2696 message_id[0] = 0; /* Indicate no message accepted */
2697 smtp_reply = handle_lost_connection(US"");
2698 smtp_yield = FALSE;
2699 goto TIDYUP; /* Skip to end of function */
2700 }
2701
2702 /* Handle message that is too big. Don't use host_or_ident() in the log
2703 message; we want to see the ident value even for non-remote messages. */
2704
2705 if (message_ended == END_SIZE)
2706 {
2707 Uunlink(spool_name); /* Lose the data file when closed */
2708 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2709
2710 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2711 "message too big: read=%d max=%d",
2712 sender_address,
2713 (sender_fullhost == NULL)? "" : " H=",
2714 (sender_fullhost == NULL)? US"" : sender_fullhost,
2715 (sender_ident == NULL)? "" : " U=",
2716 (sender_ident == NULL)? US"" : sender_ident,
2717 message_size,
2718 thismessage_size_limit);
2719
2720 if (smtp_input)
2721 {
2722 smtp_reply = US"552 Message size exceeds maximum permitted";
2723 message_id[0] = 0; /* Indicate no message accepted */
2724 goto TIDYUP; /* Skip to end of function */
2725 }
2726 else
2727 {
2728 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2729 give_local_error(ERRMESS_TOOBIG,
2730 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2731 US"message rejected: ", error_rc, data_file, header_list);
2732 /* Does not return */
2733 }
2734 }
2735 }
2736
2737 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2738 example, there may be some expansion in an ACL that uses a timer.) */
2739
2740 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2741
2742 /* The message body has now been read into the data file. Call fflush() to
2743 empty the buffers in C, and then call fsync() to get the data written out onto
2744 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2745 having to do this). If there was an I/O error on either input or output,
2746 attempt to send an error message, and unlink the spool file. For non-SMTP input
2747 we can then give up. Note that for SMTP input we must swallow the remainder of
2748 the input in cases of output errors, since the far end doesn't expect to see
2749 anything until the terminating dot line is sent. */
2750
2751 if (fflush(data_file) == EOF || ferror(data_file) ||
2752 fsync(fileno(data_file)) < 0 || (receive_ferror)())
2753 {
2754 uschar *msg_errno = US strerror(errno);
2755 BOOL input_error = (receive_ferror)() != 0;
2756 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2757 input_error? "Input read" : "Spool write",
2758 msg_errno,
2759 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2760
2761 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2762 Uunlink(spool_name); /* Lose the data file */
2763
2764 if (smtp_input)
2765 {
2766 if (input_error)
2767 smtp_reply = US"451 Error while reading input data";
2768 else
2769 {
2770 smtp_reply = US"451 Error while writing spool file";
2771 receive_swallow_smtp();
2772 }
2773 message_id[0] = 0; /* Indicate no message accepted */
2774 goto TIDYUP; /* Skip to end of function */
2775 }
2776
2777 else
2778 {
2779 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2780 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2781 header_list);
2782 /* Does not return */
2783 }
2784 }
2785
2786
2787 /* No I/O errors were encountered while writing the data file. */
2788
2789 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2790
2791
2792 /* If there were any bad addresses extracted by -t, or there were no recipients
2793 left after -t, send a message to the sender of this message, or write it to
2794 stderr if the error handling option is set that way. Note that there may
2795 legitimately be no recipients for an SMTP message if they have all been removed
2796 by "discard".
2797
2798 We need to rewind the data file in order to read it. In the case of no
2799 recipients or stderr error writing, throw the data file away afterwards, and
2800 exit. (This can't be SMTP, which always ensures there's at least one
2801 syntactically good recipient address.) */
2802
2803 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2804 {
2805 DEBUG(D_receive)
2806 {
2807 if (recipients_count == 0) debug_printf("*** No recipients\n");
2808 if (bad_addresses != NULL)
2809 {
2810 error_block *eblock = bad_addresses;
2811 debug_printf("*** Bad address(es)\n");
2812 while (eblock != NULL)
2813 {
2814 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2815 eblock = eblock->next;
2816 }
2817 }
2818 }
2819
2820 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2821
2822 /* If configured to send errors to the sender, but this fails, force
2823 a failure error code. We use a special one for no recipients so that it
2824 can be detected by the autoreply transport. Otherwise error_rc is set to
2825 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2826 it is EXIT_SUCCESS. */
2827
2828 if (error_handling == ERRORS_SENDER)
2829 {
2830 if (!moan_to_sender(
2831 (bad_addresses == NULL)?
2832 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2833 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2834 bad_addresses, header_list, data_file, FALSE))
2835 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2836 }
2837 else
2838 {
2839 if (bad_addresses == NULL)
2840 {
2841 if (extracted_ignored)
2842 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2843 else
2844 fprintf(stderr, "exim: no recipients in message\n");
2845 }
2846 else
2847 {
2848 fprintf(stderr, "exim: invalid address%s",
2849 (bad_addresses->next == NULL)? ":" : "es:\n");
2850 while (bad_addresses != NULL)
2851 {
2852 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2853 bad_addresses->text2);
2854 bad_addresses = bad_addresses->next;
2855 }
2856 }
2857 }
2858
2859 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2860 {
2861 Uunlink(spool_name);
2862 (void)fclose(data_file);
2863 exim_exit(error_rc);
2864 }
2865 }
2866
2867 /* Data file successfully written. Generate text for the Received: header by
2868 expanding the configured string, and adding a timestamp. By leaving this
2869 operation till now, we ensure that the timestamp is the time that message
2870 reception was completed. However, this is deliberately done before calling the
2871 data ACL and local_scan().
2872
2873 This Received: header may therefore be inspected by the data ACL and by code in
2874 the local_scan() function. When they have run, we update the timestamp to be
2875 the final time of reception.
2876
2877 If there is just one recipient, set up its value in the $received_for variable
2878 for use when we generate the Received: header.
2879
2880 Note: the checking for too many Received: headers is handled by the delivery
2881 code. */
2882
2883 timestamp = expand_string(US"${tod_full}");
2884 if (recipients_count == 1) received_for = recipients_list[0].address;
2885 received = expand_string(received_header_text);
2886 received_for = NULL;
2887
2888 if (received == NULL)
2889 {
2890 Uunlink(spool_name); /* Lose the data file */
2891 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2892 "(received_header_text) failed: %s", string_printing(received_header_text),
2893 expand_string_message);
2894 }
2895
2896 /* The first element on the header chain is reserved for the Received header,
2897 so all we have to do is fill in the text pointer, and set the type. However, if
2898 the result of the expansion is an empty string, we leave the header marked as
2899 "old" so as to refrain from adding a Received header. */
2900
2901 if (received[0] == 0)
2902 {
2903 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2904 received_header->type = htype_old;
2905 }
2906 else
2907 {
2908 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2909 received_header->type = htype_received;
2910 }
2911
2912 received_header->slen = Ustrlen(received_header->text);
2913
2914 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2915 received_header->type, received_header->text);
2916
2917 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2918
2919 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2920 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2921
2922 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2923 now, before running the DATA ACL. */
2924
2925 add_acl_headers(US"MAIL or RCPT");
2926
2927 /* If an ACL is specified for checking things at this stage of reception of a
2928 message, run it, unless all the recipients were removed by "discard" in earlier
2929 ACLs. That is the only case in which recipients_count can be zero at this
2930 stage. Set deliver_datafile to point to the data file so that $message_body and
2931 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2932 */
2933
2934 deliver_datafile = data_fd;
2935
2936 if (recipients_count == 0)
2937 {
2938 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2939 }
2940 else
2941 {
2942 enable_dollar_recipients = TRUE;
2943
2944 /* Handle interactive SMTP messages */
2945
2946 if (smtp_input && !smtp_batched_input)
2947 {
2948
2949 #ifdef EXPERIMENTAL_DOMAINKEYS
2950 dk_exim_verify_finish();
2951 #endif
2952
2953 #ifdef WITH_CONTENT_SCAN
2954 if (acl_smtp_mime != NULL &&
2955 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
2956 goto TIDYUP;
2957 #endif /* WITH_CONTENT_SCAN */
2958
2959 /* Check the recipients count again, as the MIME ACL might have changed
2960 them. */
2961
2962 if (acl_smtp_data != NULL && recipients_count > 0)
2963 {
2964 uschar *user_msg, *log_msg;
2965 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
2966 add_acl_headers(US"DATA");
2967 if (rc == DISCARD)
2968 {
2969 recipients_count = 0;
2970 blackholed_by = US"DATA ACL";
2971 if (log_msg != NULL)
2972 blackhole_log_msg = string_sprintf(": %s", log_msg);
2973 }
2974 else if (rc != OK)
2975 {
2976 Uunlink(spool_name);
2977 #ifdef WITH_CONTENT_SCAN
2978 unspool_mbox();
2979 #endif
2980 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
2981 smtp_yield = FALSE; /* No more messsages after dropped connection */
2982 smtp_reply = US""; /* Indicate reply already sent */
2983 message_id[0] = 0; /* Indicate no message accepted */
2984 goto TIDYUP; /* Skip to end of function */
2985 }
2986 }
2987 }
2988
2989 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
2990 we cannot take different actions for permanent and temporary rejections. */
2991
2992 else
2993 {
2994
2995 #ifdef WITH_CONTENT_SCAN
2996 if (acl_not_smtp_mime != NULL &&
2997 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
2998 &blackholed_by))
2999 goto TIDYUP;
3000 #endif /* WITH_CONTENT_SCAN */
3001
3002 if (acl_not_smtp != NULL)
3003 {
3004 uschar *user_msg, *log_msg;
3005 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3006 if (rc == DISCARD)
3007 {
3008 recipients_count = 0;
3009 blackholed_by = US"non-SMTP ACL";
3010 if (log_msg != NULL)
3011 blackhole_log_msg = string_sprintf(": %s", log_msg);
3012 }
3013 else if (rc != OK)
3014 {
3015 Uunlink(spool_name);
3016 #ifdef WITH_CONTENT_SCAN
3017 unspool_mbox();
3018 #endif
3019 log_write(0, LOG_MAIN|LOG_REJECT, "F=<%s> rejected by non-SMTP ACL: %s",
3020 sender_address, log_msg);
3021 if (user_msg == NULL) user_msg = US"local configuration problem";
3022 if (smtp_batched_input)
3023 {
3024 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3025 /* Does not return */
3026 }
3027 else
3028 {
3029 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3030 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3031 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3032 header_list);
3033 /* Does not return */
3034 }
3035 }
3036 add_acl_headers(US"non-SMTP");
3037 }
3038 }
3039
3040 /* The applicable ACLs have been run */
3041
3042 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3043 if (queue_only_policy) queued_by = US"ACL";
3044
3045 enable_dollar_recipients = FALSE;
3046 }
3047
3048 #ifdef WITH_CONTENT_SCAN
3049 unspool_mbox();
3050 #endif
3051
3052 /* The final check on the message is to run the scan_local() function. The
3053 version supplied with Exim always accepts, but this is a hook for sysadmins to
3054 supply their own checking code. The local_scan() function is run even when all
3055 the recipients have been discarded. */
3056
3057 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3058
3059 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3060 deleted, and the incident gets logged. */
3061
3062 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3063 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3064 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3065 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3066
3067 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3068 local_scan_timeout);
3069 local_scan_data = NULL;
3070
3071 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3072 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3073 rc = local_scan(data_fd, &local_scan_data);
3074 alarm(0);
3075 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3076
3077 store_pool = POOL_MAIN; /* In case changed */
3078 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3079 local_scan_data);
3080
3081 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3082 os_non_restarting_signal(SIGFPE, SIG_DFL);
3083 os_non_restarting_signal(SIGILL, SIG_DFL);
3084 os_non_restarting_signal(SIGBUS, SIG_DFL);
3085
3086 /* The length check is paranoia against some runaway code, and also because
3087 (for a success return) lines in the spool file are read into big_buffer. */
3088
3089 if (local_scan_data != NULL)
3090 {
3091 int len = Ustrlen(local_scan_data);
3092 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3093 local_scan_data = string_copyn(local_scan_data, len);
3094 }
3095
3096 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3097 {
3098 if (!deliver_freeze) /* ACL might have already frozen */
3099 {
3100 deliver_freeze = TRUE;
3101 deliver_frozen_at = time(NULL);
3102 frozen_by = US"local_scan()";
3103 }
3104 rc = LOCAL_SCAN_ACCEPT;
3105 }
3106 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3107 {
3108 if (!queue_only_policy) /* ACL might have already queued */
3109 {
3110 queue_only_policy = TRUE;
3111 queued_by = US"local_scan()";
3112 }
3113 rc = LOCAL_SCAN_ACCEPT;
3114 }
3115
3116 /* Message accepted: remove newlines in local_scan_data because otherwise
3117 the spool file gets corrupted. Ensure that all recipients are qualified. */
3118
3119 if (rc == LOCAL_SCAN_ACCEPT)
3120 {
3121 if (local_scan_data != NULL)
3122 {
3123 uschar *s;
3124 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3125 }
3126 for (i = 0; i < recipients_count; i++)
3127 {
3128 recipient_item *r = recipients_list + i;
3129 r->address = rewrite_address_qualify(r->address, TRUE);
3130 if (r->errors_to != NULL)
3131 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3132 }
3133 if (recipients_count == 0 && blackholed_by == NULL)
3134 blackholed_by = US"local_scan";
3135 }
3136
3137 /* Message rejected: newlines permitted in local_scan_data to generate
3138 multiline SMTP responses. */
3139
3140 else
3141 {
3142 uschar *istemp = US"";
3143 uschar *s = NULL;
3144 int size = 0;
3145 int sptr = 0;
3146 int code;
3147
3148 errmsg = local_scan_data;
3149
3150 Uunlink(spool_name); /* Cancel this message */
3151 switch(rc)
3152 {
3153 default:
3154 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3155 "rejection given", rc);
3156 goto TEMPREJECT;
3157
3158 case LOCAL_SCAN_REJECT_NOLOGHDR:
3159 log_extra_selector &= ~LX_rejected_header;
3160 /* Fall through */
3161
3162 case LOCAL_SCAN_REJECT:
3163 code = 550;
3164 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3165 break;
3166
3167 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3168 log_extra_selector &= ~LX_rejected_header;
3169 /* Fall through */
3170
3171 case LOCAL_SCAN_TEMPREJECT:
3172 TEMPREJECT:
3173 code = 451;
3174 if (errmsg == NULL) errmsg = US"Temporary local problem";
3175 istemp = US"temporarily ";
3176 break;
3177 }
3178
3179 s = string_append(s, &size, &sptr, 2, US"F=",
3180 (sender_address[0] == 0)? US"<>" : sender_address);
3181 s = add_host_info_for_log(s, &size, &sptr);
3182 s[sptr] = 0;
3183
3184 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3185 s, istemp, string_printing(errmsg));
3186
3187 if (smtp_input)
3188 {
3189 if (!smtp_batched_input)
3190 {
3191 smtp_respond(code, TRUE, errmsg);
3192 message_id[0] = 0; /* Indicate no message accepted */
3193 smtp_reply = US""; /* Indicate reply already sent */
3194 goto TIDYUP; /* Skip to end of function */
3195 }
3196 else
3197 {
3198 moan_smtp_batch(NULL, "%d %s", code, errmsg);
3199 /* Does not return */
3200 }
3201 }
3202 else
3203 {
3204 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3205 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3206 US"message rejected by local scan code: ", error_rc, data_file,
3207 header_list);
3208 /* Does not return */
3209 }
3210 }
3211
3212 /* Reset signal handlers to ignore signals that previously would have caused
3213 the message to be abandoned. */
3214
3215 signal(SIGTERM, SIG_IGN);
3216 signal(SIGINT, SIG_IGN);
3217
3218 /* Ensure the first time flag is set in the newly-received message. */
3219
3220 deliver_firsttime = TRUE;
3221
3222 #ifdef EXPERIMENTAL_BRIGHTMAIL
3223 if (bmi_run == 1) {
3224 /* rewind data file */
3225 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3226 bmi_verdicts = bmi_process_message(header_list, data_fd);
3227 };
3228 #endif
3229
3230 /* Update the timstamp in our Received: header to account for any time taken by
3231 an ACL or by local_scan(). The new time is the time that all reception
3232 processing is complete. */
3233
3234 timestamp = expand_string(US"${tod_full}");
3235 tslen = Ustrlen(timestamp);
3236
3237 memcpy(received_header->text + received_header->slen - tslen - 1,
3238 timestamp, tslen);
3239
3240 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3241
3242 if (mua_wrapper)
3243 {
3244 deliver_freeze = FALSE;
3245 queue_only_policy = FALSE;
3246 }
3247
3248 /* Keep the data file open until we have written the header file, in order to
3249 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3250 don't write the header file, and we unlink the data file. If writing the header
3251 file fails, we have failed to accept this message. */
3252
3253 if (host_checking || blackholed_by != NULL)
3254 {
3255 header_line *h;
3256 Uunlink(spool_name);
3257 msg_size = 0; /* Compute size for log line */
3258 for (h = header_list; h != NULL; h = h->next)
3259 if (h->type != '*') msg_size += h->slen;
3260 }
3261
3262 /* Write the -H file */
3263
3264 else
3265 {
3266 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3267 {
3268 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3269 Uunlink(spool_name); /* Lose the data file */
3270
3271 if (smtp_input)
3272 {
3273 smtp_reply = US"451 Error in writing spool file";
3274 message_id[0] = 0; /* Indicate no message accepted */
3275 goto TIDYUP;
3276 }
3277 else
3278 {
3279 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3280 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3281 header_list);
3282 /* Does not return */
3283 }
3284 }
3285 }
3286
3287
3288 /* The message has now been successfully received. */
3289
3290 receive_messagecount++;
3291
3292 /* In SMTP sessions we may receive several in one connection. After each one,
3293 we wait for the clock to tick at the level of message-id granularity. This is
3294 so that the combination of time+pid is unique, even on systems where the pid
3295 can be re-used within our time interval. We can't shorten the interval without
3296 re-designing the message-id. See comments above where the message id is
3297 created. This is Something For The Future. */
3298
3299 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3300 exim_wait_tick(&message_id_tv, id_resolution);
3301
3302 /* Add data size to written header size. We do not count the initial file name
3303 that is in the file, but we do add one extra for the notional blank line that
3304 precedes the data. This total differs from message_size in that it include the
3305 added Received: header and any other headers that got created locally. */
3306
3307 fflush(data_file);
3308 fstat(data_fd, &statbuf);
3309
3310 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3311
3312 /* Generate a "message received" log entry. We do this by building up a dynamic
3313 string as required. Since we commonly want to add two items at a time, use a
3314 macro to simplify the coding. We log the arrival of a new message while the
3315 file is still locked, just in case the machine is *really* fast, and delivers
3316 it first! Include any message id that is in the message - since the syntax of a
3317 message id is actually an addr-spec, we can use the parse routine to canonicize
3318 it. */
3319
3320 size = 256;
3321 sptr = 0;
3322 s = store_get(size);
3323
3324 s = string_append(s, &size, &sptr, 2, US"<= ",
3325 (sender_address[0] == 0)? US"<>" : sender_address);
3326 if (message_reference != NULL)
3327 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3328
3329 s = add_host_info_for_log(s, &size, &sptr);
3330
3331 #ifdef SUPPORT_TLS
3332 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3333 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3334 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3335 tls_cipher != NULL)
3336 s = string_append(s, &size, &sptr, 2, US" CV=",
3337 tls_certificate_verified? "yes":"no");
3338 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3339 s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\"");
3340 #endif
3341
3342 if (sender_host_authenticated != NULL)
3343 {
3344 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3345 if (authenticated_id != NULL)
3346 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3347 }
3348
3349 sprintf(CS big_buffer, "%d", msg_size);
3350 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3351
3352 /* If an addr-spec in a message-id contains a quoted string, it can contain
3353 any characters except " \ and CR and so in particular it can contain NL!
3354 Therefore, make sure we use a printing-characters only version for the log.
3355 Also, allow for domain literals in the message id. */
3356
3357 if (msgid_header != NULL)
3358 {
3359 uschar *old_id;
3360 BOOL save_allow_domain_literals = allow_domain_literals;
3361 allow_domain_literals = TRUE;
3362 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3363 &errmsg, &start, &end, &domain, FALSE);
3364 allow_domain_literals = save_allow_domain_literals;
3365 if (old_id != NULL)
3366 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3367 }
3368
3369 /* If subject logging is turned on, create suitable printing-character
3370 text. By expanding $h_subject: we make use of the MIME decoding. */
3371
3372 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3373 {
3374 int i;
3375 uschar *p = big_buffer;
3376 uschar *ss = expand_string(US"$h_subject:");
3377
3378 /* Backslash-quote any double quotes or backslashes so as to make a
3379 a C-like string, and turn any non-printers into escape sequences. */
3380
3381 *p++ = '\"';
3382 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3383 {
3384 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3385 *p++ = ss[i];
3386 }
3387 *p++ = '\"';
3388 *p = 0;
3389 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3390 }
3391
3392 /* Terminate the string: string_cat() and string_append() leave room, but do
3393 not put the zero in. */
3394
3395 s[sptr] = 0;
3396
3397 /* While writing to the log, set a flag to cause a call to receive_bomb_out()
3398 if the log cannot be opened. */
3399
3400 receive_call_bombout = TRUE;
3401 log_write(0, LOG_MAIN |
3402 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3403 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3404 "%s", s);
3405 receive_call_bombout = FALSE;
3406
3407 /* Log any control actions taken by an ACL or local_scan(). */
3408
3409 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3410 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3411 "no immediate delivery: queued by %s", queued_by);
3412
3413 /* Create a message log file if message logs are being used and this message is
3414 not blackholed. Write the reception stuff to it. We used to leave message log
3415 creation until the first delivery, but this has proved confusing for somep
3416 people. */
3417
3418 if (message_logs && blackholed_by == NULL)
3419 {
3420 int fd;
3421
3422 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3423 message_id);
3424 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3425
3426 if (fd < 0 && errno == ENOENT)
3427 {
3428 uschar temp[16];
3429 sprintf(CS temp, "msglog/%s", message_subdir);
3430 if (message_subdir[0] == 0) temp[6] = 0;
3431 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3432 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3433 }
3434
3435 if (fd < 0)
3436 {
3437 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3438 spool_name, strerror(errno));
3439 }
3440
3441 else
3442 {
3443 FILE *message_log = fdopen(fd, "a");
3444 if (message_log == NULL)
3445 {
3446 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3447 spool_name, strerror(errno));
3448 (void)close(fd);
3449 }
3450 else
3451 {
3452 uschar *now = tod_stamp(tod_log);
3453 fprintf(message_log, "%s Received from %s\n", now, s+3);
3454 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3455 frozen_by);
3456 if (queue_only_policy) fprintf(message_log,
3457 "%s no immediate delivery: queued by %s\n", now, queued_by);
3458 (void)fclose(message_log);
3459 }
3460 }
3461 }
3462
3463 store_reset(s); /* The store for the main log message can be reused */
3464
3465 /* If the message is frozen, and freeze_tell is set, do the telling. */
3466
3467 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3468 {
3469 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3470 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3471 message_id, frozen_by, sender_address);
3472 }
3473
3474
3475 /* Either a message has been successfully received and written to the two spool
3476 files, or an error in writing the spool has occurred for an SMTP message, or
3477 an SMTP message has been rejected because of a bad sender. (For a non-SMTP
3478 message we will have already given up because there's no point in carrying on!)
3479 In either event, we must now close (and thereby unlock) the data file. In the
3480 successful case, this leaves the message on the spool, ready for delivery. In
3481 the error case, the spool file will be deleted. Then tidy up store, interact
3482 with an SMTP call if necessary, and return.
3483
3484 A fflush() was done earlier in the expectation that any write errors on the
3485 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3486 possible for fclose() to fail - but what to do? What has happened to the lock
3487 if this happens? */
3488
3489 TIDYUP:
3490 process_info[process_info_len] = 0; /* Remove message id */
3491 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
3492
3493 /* Now reset signal handlers to their defaults */
3494
3495 signal(SIGTERM, SIG_DFL);
3496 signal(SIGINT, SIG_DFL);
3497
3498 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3499 value, which defaults TRUE - meaning there may be more incoming messages from
3500 this connection. For non-SMTP callers (where there is only ever one message),
3501 the default is FALSE. */
3502
3503 if (smtp_input)
3504 {
3505 yield = smtp_yield;
3506
3507 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3508 is set to the response. However, after an ACL error or local_scan() error,
3509 the response has already been sent, and smtp_reply is an empty string to
3510 indicate this. */
3511
3512 if (!smtp_batched_input)
3513 {
3514 if (smtp_reply == NULL)
3515 {
3516 if (fake_response != OK)
3517 smtp_respond(fake_response == DEFER ? 450 : 550,
3518 TRUE, fake_response_text);
3519 else
3520 smtp_printf("250 OK id=%s\r\n", message_id);
3521 if (host_checking)
3522 fprintf(stdout,
3523 "\n**** SMTP testing: that is not a real message id!\n\n");
3524 }
3525 else if (smtp_reply[0] != 0)
3526 {
3527 if (fake_response != OK && (smtp_reply[0] == '2'))
3528 smtp_respond(fake_response == DEFER ? 450 : 550,
3529 TRUE, fake_response_text);
3530 else
3531 smtp_printf("%.1024s\r\n", smtp_reply);
3532 }
3533 }
3534
3535 /* For batched SMTP, generate an error message on failure, and do
3536 nothing on success. The function moan_smtp_batch() does not return -
3537 it exits from the program with a non-zero return code. */
3538
3539 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
3540 }
3541
3542
3543 /* If blackholing, we can immediately log this message's sad fate. The data
3544 file has already been unlinked, and the header file was never written to disk.
3545 We must now indicate that nothing was received, to prevent a delivery from
3546 starting. */
3547
3548 if (blackholed_by != NULL)
3549 {
3550 uschar *detail = (local_scan_data != NULL)?
3551 string_printing(local_scan_data) :
3552 string_sprintf("(%s discarded recipients)", blackholed_by);
3553 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
3554 log_write(0, LOG_MAIN, "Completed");
3555 message_id[0] = 0;
3556 }
3557
3558 /* Reset headers so that logging of rejects for a subsequent message doesn't
3559 include them. It is also important to set header_last = NULL before exiting
3560 from this function, as this prevents certain rewrites that might happen during
3561 subsequent verifying (of another incoming message) from trying to add headers
3562 when they shouldn't. */
3563
3564 header_list = header_last = NULL;
3565
3566 return yield; /* TRUE if more messages (SMTP only) */
3567 }
3568
3569 /* End of receive.c */