Fix bug in previous patch: following data is permitted after '.' so it
[exim.git] / src / src / receive.c
1 /* $Cambridge: exim/src/src/receive.c,v 1.37 2007/04/16 10:31:58 ph10 Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2007 */
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
879 statements in an ACL to the list of headers in memory. It is done in two stages
880 like this, because when the ACL for RCPT is running, the other headers have not
881 yet been received. This function is called twice; once just before running the
882 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
883 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_added_headers == NULL) return;
903 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
904
905 for (h = acl_added_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_added_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 {
1047 /* skip deleted headers */
1048 if (my_headerlist->type == '*')
1049 {
1050 my_headerlist = my_headerlist->next;
1051 continue;
1052 }
1053 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1054 {
1055 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1056 goto DO_MIME_ACL;
1057 }
1058 my_headerlist = my_headerlist->next;
1059 }
1060
1061 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1062 return TRUE;
1063
1064 DO_MIME_ACL:
1065 /* make sure the eml mbox file is spooled up */
1066 mbox_file = spool_mbox(&mbox_size);
1067 if (mbox_file == NULL) {
1068 /* error while spooling */
1069 log_write(0, LOG_MAIN|LOG_PANIC,
1070 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1071 Uunlink(spool_name);
1072 unspool_mbox();
1073 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1074 message_id[0] = 0; /* Indicate no message accepted */
1075 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1076 return FALSE; /* Indicate skip to end of receive function */
1077 };
1078
1079 mime_is_rfc822 = 0;
1080
1081 MIME_ACL_CHECK:
1082 mime_part_count = -1;
1083 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1084 (void)fclose(mbox_file);
1085
1086 if (Ustrlen(rfc822_file_path) > 0)
1087 {
1088 mime_part_count = mime_part_count_buffer;
1089
1090 if (unlink(CS rfc822_file_path) == -1)
1091 {
1092 log_write(0, LOG_PANIC,
1093 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1094 goto END_MIME_ACL;
1095 }
1096 }
1097
1098 /* check if we must check any message/rfc822 attachments */
1099 if (rc == OK)
1100 {
1101 uschar temp_path[1024];
1102 int n;
1103 struct dirent *entry;
1104 DIR *tempdir;
1105
1106 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1107 message_id);
1108
1109 tempdir = opendir(CS temp_path);
1110 n = 0;
1111 do
1112 {
1113 entry = readdir(tempdir);
1114 if (entry == NULL) break;
1115 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1116 {
1117 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1118 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1119 break;
1120 }
1121 } while (1);
1122 closedir(tempdir);
1123
1124 if (entry != NULL)
1125 {
1126 mbox_file = Ufopen(rfc822_file_path,"rb");
1127 if (mbox_file == NULL)
1128 {
1129 log_write(0, LOG_PANIC,
1130 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1131 unlink(CS rfc822_file_path);
1132 goto END_MIME_ACL;
1133 }
1134 /* set RFC822 expansion variable */
1135 mime_is_rfc822 = 1;
1136 mime_part_count_buffer = mime_part_count;
1137 goto MIME_ACL_CHECK;
1138 }
1139 }
1140
1141 END_MIME_ACL:
1142 add_acl_headers(US"MIME");
1143 if (rc == DISCARD)
1144 {
1145 recipients_count = 0;
1146 *blackholed_by_ptr = US"MIME ACL";
1147 }
1148 else if (rc != OK)
1149 {
1150 Uunlink(spool_name);
1151 unspool_mbox();
1152 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1153 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1154 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1155 message_id[0] = 0; /* Indicate no message accepted */
1156 return FALSE; /* Cause skip to end of receive function */
1157 }
1158
1159 return TRUE;
1160 }
1161
1162 #endif /* WITH_CONTENT_SCAN */
1163
1164
1165 /*************************************************
1166 * Receive message *
1167 *************************************************/
1168
1169 /* Receive a message on the given input, and put it into a pair of spool files.
1170 Either a non-null list of recipients, or the extract flag will be true, or
1171 both. The flag sender_local is true for locally generated messages. The flag
1172 submission_mode is true if an ACL has obeyed "control = submission". The flag
1173 suppress_local_fixups is true if an ACL has obeyed "control =
1174 suppress_local_fixups". The flag smtp_input is true if the message is to be
1175 handled using SMTP conventions about termination and lines starting with dots.
1176 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1177
1178 If a message was successfully read, message_id[0] will be non-zero.
1179
1180 The general actions of this function are:
1181
1182 . Read the headers of the message (if any) into a chain of store
1183 blocks.
1184
1185 . If there is a "sender:" header and the message is locally originated,
1186 throw it away, unless the caller is trusted, or unless
1187 active_local_sender_retain is set - which can only happen if
1188 active_local_from_check is false.
1189
1190 . If recipients are to be extracted from the message, build the
1191 recipients list from the headers, removing any that were on the
1192 original recipients list (unless extract_addresses_remove_arguments is
1193 false), and at the same time, remove any bcc header that may be present.
1194
1195 . Get the spool file for the data, sort out its unique name, open
1196 and lock it (but don't give it the name yet).
1197
1198 . Generate a "Message-Id" header if the message doesn't have one, for
1199 locally-originated messages.
1200
1201 . Generate a "Received" header.
1202
1203 . Ensure the recipients list is fully qualified and rewritten if necessary.
1204
1205 . If there are any rewriting rules, apply them to the sender address
1206 and also to the headers.
1207
1208 . If there is no from: header, generate one, for locally-generated messages
1209 and messages in "submission mode" only.
1210
1211 . If the sender is local, check that from: is correct, and if not, generate
1212 a Sender: header, unless message comes from a trusted caller, or this
1213 feature is disabled by active_local_from_check being false.
1214
1215 . If there is no "date" header, generate one, for locally-originated
1216 or submission mode messages only.
1217
1218 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1219 dot_ends mode, to the data file. Leave it open, to hold the lock.
1220
1221 . Write the envelope and the headers to a new file.
1222
1223 . Set the name for the header file; close it.
1224
1225 . Set the name for the data file; close it.
1226
1227 Because this function can potentially be called many times in a single
1228 SMTP connection, all store should be got by store_get(), so that it will be
1229 automatically retrieved after the message is accepted.
1230
1231 FUDGE: It seems that sites on the net send out messages with just LF
1232 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1233 we make the CRs optional in all cases.
1234
1235 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1236 new regime is now in place in which bare CRs in header lines are turned into LF
1237 followed by a space, so as not to terminate the header line.
1238
1239 February 2004: A bare LF in a header line in a message whose first line was
1240 terminated by CRLF is treated in the same way as a bare CR.
1241
1242 Arguments:
1243 extract_recip TRUE if recipients are to be extracted from the message's
1244 headers
1245
1246 Returns: TRUE there are more messages to be read (SMTP input)
1247 FALSE there are no more messages to be read (non-SMTP input
1248 or SMTP connection collapsed, or other failure)
1249
1250 When reading a message for filter testing, the returned value indicates
1251 whether the headers (which is all that is read) were terminated by '.' or
1252 not. */
1253
1254 BOOL
1255 receive_msg(BOOL extract_recip)
1256 {
1257 int i, rc;
1258 int msg_size = 0;
1259 int process_info_len = Ustrlen(process_info);
1260 int error_rc = (error_handling == ERRORS_SENDER)?
1261 errors_sender_rc : EXIT_FAILURE;
1262 int header_size = 256;
1263 int start, end, domain, size, sptr;
1264 int id_resolution;
1265 int had_zero = 0;
1266
1267 register int ptr = 0;
1268
1269 BOOL contains_resent_headers = FALSE;
1270 BOOL extracted_ignored = FALSE;
1271 BOOL first_line_ended_crlf = TRUE_UNSET;
1272 BOOL smtp_yield = TRUE;
1273 BOOL yield = FALSE;
1274
1275 BOOL resents_exist = FALSE;
1276 uschar *resent_prefix = US"";
1277 uschar *blackholed_by = NULL;
1278 uschar *blackhole_log_msg = US"";
1279
1280 flock_t lock_data;
1281 error_block *bad_addresses = NULL;
1282
1283 uschar *frozen_by = NULL;
1284 uschar *queued_by = NULL;
1285
1286 uschar *errmsg, *s;
1287 struct stat statbuf;
1288
1289 /* Final message to give to SMTP caller, and messages from ACLs */
1290
1291 uschar *smtp_reply = NULL;
1292 uschar *user_msg, *log_msg;
1293
1294 /* Working header pointers */
1295
1296 header_line *h, *next;
1297
1298 /* Flags for noting the existence of certain headers (only one left) */
1299
1300 BOOL date_header_exists = FALSE;
1301
1302 /* Pointers to receive the addresses of headers whose contents we need. */
1303
1304 header_line *from_header = NULL;
1305 header_line *subject_header = NULL;
1306 header_line *msgid_header = NULL;
1307 header_line *received_header;
1308
1309 /* Variables for use when building the Received: header. */
1310
1311 uschar *received;
1312 uschar *timestamp;
1313 int tslen;
1314
1315 /* Release any open files that might have been cached while preparing to
1316 accept the message - e.g. by verifying addresses - because reading a message
1317 might take a fair bit of real time. */
1318
1319 search_tidyup();
1320
1321 /* Initialize the chain of headers by setting up a place-holder for Received:
1322 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1323 pointing to the end of the chain to make adding headers simple. */
1324
1325 received_header = header_list = header_last = store_get(sizeof(header_line));
1326 header_list->next = NULL;
1327 header_list->type = htype_old;
1328 header_list->text = NULL;
1329 header_list->slen = 0;
1330
1331 /* Control block for the next header to be read. */
1332
1333 next = store_get(sizeof(header_line));
1334 next->text = store_get(header_size);
1335
1336 /* Initialize message id to be null (indicating no message read), and the
1337 header names list to be the normal list. Indicate there is no data file open
1338 yet, initialize the size and warning count, and deal with no size limit. */
1339
1340 message_id[0] = 0;
1341 data_file = NULL;
1342 data_fd = -1;
1343 spool_name[0] = 0;
1344 message_size = 0;
1345 warning_count = 0;
1346 received_count = 1; /* For the one we will add */
1347
1348 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1349
1350 /* While reading the message, the following counts are computed. */
1351
1352 message_linecount = body_linecount = body_zerocount = 0;
1353
1354 #ifdef EXPERIMENTAL_DOMAINKEYS
1355 /* Call into DK to set up the context. Check if DK is to be run are carried out
1356 inside dk_exim_verify_init(). */
1357 dk_exim_verify_init();
1358 #endif
1359
1360 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1361 ids, and fractions of a second are required. See the comments that precede the
1362 message id creation below. */
1363
1364 (void)gettimeofday(&message_id_tv, NULL);
1365
1366 /* For other uses of the received time we can operate with granularity of one
1367 second, and for that we use the global variable received_time. This is for
1368 things like ultimate message timeouts. */
1369
1370 received_time = message_id_tv.tv_sec;
1371
1372 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1373 happen in the smtp_getc() function when it refills its buffer. */
1374
1375 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1376
1377 /* If not SMTP input, timeout happens only if configured, and we just set a
1378 single timeout for the whole message. */
1379
1380 else if (receive_timeout > 0)
1381 {
1382 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1383 alarm(receive_timeout);
1384 }
1385
1386 /* SIGTERM and SIGINT are caught always. */
1387
1388 signal(SIGTERM, data_sigterm_sigint_handler);
1389 signal(SIGINT, data_sigterm_sigint_handler);
1390
1391 /* Header lines in messages are not supposed to be very long, though when
1392 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1393 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1394 storing the header, and extend this as necessary using string_cat().
1395
1396 To cope with total lunacies, impose an upper limit on the length of the header
1397 section of the message, as otherwise the store will fill up. We must also cope
1398 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1399 Folded header lines are joined into one string, leaving the '\n' characters
1400 inside them, so that writing them out reproduces the input.
1401
1402 Loop for each character of each header; the next structure for chaining the
1403 header is set up already, with ptr the offset of the next character in
1404 next->text. */
1405
1406 for (;;)
1407 {
1408 int ch = (RECEIVE_GETC)();
1409
1410 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1411 SMTP must have a correct "." terminator. */
1412
1413 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1414 {
1415 smtp_reply = handle_lost_connection(US" (header)");
1416 smtp_yield = FALSE;
1417 goto TIDYUP; /* Skip to end of function */
1418 }
1419
1420 /* See if we are at the current header's size limit - there must be at least
1421 four bytes left. This allows for the new character plus a zero, plus two for
1422 extra insertions when we are playing games with dots and carriage returns. If
1423 we are at the limit, extend the text buffer. This could have been done
1424 automatically using string_cat() but because this is a tightish loop storing
1425 only one character at a time, we choose to do it inline. Normally
1426 store_extend() will be able to extend the block; only at the end of a big
1427 store block will a copy be needed. To handle the case of very long headers
1428 (and sometimes lunatic messages can have ones that are 100s of K long) we
1429 call store_release() for strings that have been copied - if the string is at
1430 the start of a block (and therefore the only thing in it, because we aren't
1431 doing any other gets), the block gets freed. We can only do this because we
1432 know there are no other calls to store_get() going on. */
1433
1434 if (ptr >= header_size - 4)
1435 {
1436 int oldsize = header_size;
1437 /* header_size += 256; */
1438 header_size *= 2;
1439 if (!store_extend(next->text, oldsize, header_size))
1440 {
1441 uschar *newtext = store_get(header_size);
1442 memcpy(newtext, next->text, ptr);
1443 store_release(next->text);
1444 next->text = newtext;
1445 }
1446 }
1447
1448 /* Cope with receiving a binary zero. There is dispute about whether
1449 these should be allowed in RFC 822 messages. The middle view is that they
1450 should not be allowed in headers, at least. Exim takes this attitude at
1451 the moment. We can't just stomp on them here, because we don't know that
1452 this line is a header yet. Set a flag to cause scanning later. */
1453
1454 if (ch == 0) had_zero++;
1455
1456 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1457 those from data files use just LF. Treat LF in local SMTP input as a
1458 terminator too. Treat EOF as a line terminator always. */
1459
1460 if (ch == EOF) goto EOL;
1461
1462 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1463 other MTAs accept this. We are therefore forced into this "liberalisation"
1464 too, so we accept LF as a line terminator whatever the source of the message.
1465 However, if the first line of the message ended with a CRLF, we treat a bare
1466 LF specially by inserting a white space after it to ensure that the header
1467 line is not terminated. */
1468
1469 if (ch == '\n')
1470 {
1471 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1472 else if (first_line_ended_crlf) RECEIVE_UNGETC(' ');
1473 goto EOL;
1474 }
1475
1476 /* This is not the end of the line. If this is SMTP input and this is
1477 the first character in the line and it is a "." character, ignore it.
1478 This implements the dot-doubling rule, though header lines starting with
1479 dots aren't exactly common. They are legal in RFC 822, though. If the
1480 following is CRLF or LF, this is the line that that terminates the
1481 entire message. We set message_ended to indicate this has happened (to
1482 prevent further reading), and break out of the loop, having freed the
1483 empty header, and set next = NULL to indicate no data line. */
1484
1485 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1486 {
1487 ch = (RECEIVE_GETC)();
1488 if (ch == '\r')
1489 {
1490 ch = (RECEIVE_GETC)();
1491 if (ch != '\n')
1492 {
1493 RECEIVE_UNGETC(ch);
1494 ch = '\r'; /* Revert to CR */
1495 }
1496 }
1497 if (ch == '\n')
1498 {
1499 message_ended = END_DOT;
1500 store_reset(next);
1501 next = NULL;
1502 break; /* End character-reading loop */
1503 }
1504
1505 /* For non-SMTP input, the dot at the start of the line was really a data
1506 character. What is now in ch is the following character. We guaranteed
1507 enough space for this above. */
1508
1509 if (!smtp_input)
1510 {
1511 next->text[ptr++] = '.';
1512 message_size++;
1513 }
1514 }
1515
1516 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1517 remember this case if this is the first line ending. */
1518
1519 if (ch == '\r')
1520 {
1521 ch = (RECEIVE_GETC)();
1522 if (ch == '\n')
1523 {
1524 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1525 goto EOL;
1526 }
1527
1528 /* Otherwise, put back the character after CR, and turn the bare CR
1529 into LF SP. */
1530
1531 ch = (RECEIVE_UNGETC)(ch);
1532 next->text[ptr++] = '\n';
1533 message_size++;
1534 ch = ' ';
1535 }
1536
1537 /* We have a data character for the header line. */
1538
1539 next->text[ptr++] = ch; /* Add to buffer */
1540 message_size++; /* Total message size so far */
1541
1542 /* Handle failure due to a humungously long header section. The >= allows
1543 for the terminating \n. Add what we have so far onto the headers list so
1544 that it gets reflected in any error message, and back up the just-read
1545 character. */
1546
1547 if (message_size >= header_maxsize)
1548 {
1549 next->text[ptr] = 0;
1550 next->slen = ptr;
1551 next->type = htype_other;
1552 next->next = NULL;
1553 header_last->next = next;
1554 header_last = next;
1555
1556 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1557 "%s (more than %d characters): message abandoned",
1558 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1559
1560 if (smtp_input)
1561 {
1562 smtp_reply = US"552 Message header is ridiculously long";
1563 receive_swallow_smtp();
1564 goto TIDYUP; /* Skip to end of function */
1565 }
1566
1567 else
1568 {
1569 give_local_error(ERRMESS_VLONGHEADER,
1570 string_sprintf("message header longer than %d characters received: "
1571 "message not accepted", header_maxsize), US"", error_rc, stdin,
1572 header_list->next);
1573 /* Does not return */
1574 }
1575 }
1576
1577 continue; /* With next input character */
1578
1579 /* End of header line reached */
1580
1581 EOL:
1582
1583 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1584
1585 receive_linecount++;
1586 message_linecount++;
1587
1588 /* Now put in the terminating newline. There is always space for
1589 at least two more characters. */
1590
1591 next->text[ptr++] = '\n';
1592 message_size++;
1593
1594 /* A blank line signals the end of the headers; release the unwanted
1595 space and set next to NULL to indicate this. */
1596
1597 if (ptr == 1)
1598 {
1599 store_reset(next);
1600 next = NULL;
1601 break;
1602 }
1603
1604 /* There is data in the line; see if the next input character is a
1605 whitespace character. If it is, we have a continuation of this header line.
1606 There is always space for at least one character at this point. */
1607
1608 if (ch != EOF)
1609 {
1610 int nextch = (RECEIVE_GETC)();
1611 if (nextch == ' ' || nextch == '\t')
1612 {
1613 next->text[ptr++] = nextch;
1614 message_size++;
1615 continue; /* Iterate the loop */
1616 }
1617 else if (nextch != EOF) (RECEIVE_UNGETC)(nextch); /* For next time */
1618 else ch = EOF; /* Cause main loop to exit at end */
1619 }
1620
1621 /* We have got to the real line end. Terminate the string and release store
1622 beyond it. If it turns out to be a real header, internal binary zeros will
1623 be squashed later. */
1624
1625 next->text[ptr] = 0;
1626 next->slen = ptr;
1627 store_reset(next->text + ptr + 1);
1628
1629 /* Check the running total size against the overall message size limit. We
1630 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1631 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1632 headers - the code to read the body will then also hit the buffer. */
1633
1634 if (message_size > thismessage_size_limit) break;
1635
1636 /* A line that is not syntactically correct for a header also marks
1637 the end of the headers. In this case, we leave next containing the
1638 first data line. This might actually be several lines because of the
1639 continuation logic applied above, but that doesn't matter.
1640
1641 It turns out that smail, and presumably sendmail, accept leading lines
1642 of the form
1643
1644 From ph10 Fri Jan 5 12:35 GMT 1996
1645
1646 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1647 find any documentation of this, but for compatibility it had better be
1648 accepted. Exim restricts it to the case of non-smtp messages, and
1649 treats it as an alternative to the -f command line option. Thus it is
1650 ignored except for trusted users or filter testing. Otherwise it is taken
1651 as the sender address, unless -f was used (sendmail compatibility).
1652
1653 It further turns out that some UUCPs generate the From_line in a different
1654 format, e.g.
1655
1656 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1657
1658 The regex for matching these things is now capable of recognizing both
1659 formats (including 2- and 4-digit years in the latter). In fact, the regex
1660 is now configurable, as is the expansion string to fish out the sender.
1661
1662 Even further on it has been discovered that some broken clients send
1663 these lines in SMTP messages. There is now an option to ignore them from
1664 specified hosts or networks. Sigh. */
1665
1666 if (header_last == header_list &&
1667 (!smtp_input
1668 ||
1669 (sender_host_address != NULL &&
1670 verify_check_host(&ignore_fromline_hosts) == OK)
1671 ||
1672 (sender_host_address == NULL && ignore_fromline_local)
1673 ) &&
1674 regex_match_and_setup(regex_From, next->text, 0, -1))
1675 {
1676 if (!sender_address_forced)
1677 {
1678 uschar *uucp_sender = expand_string(uucp_from_sender);
1679 if (uucp_sender == NULL)
1680 {
1681 log_write(0, LOG_MAIN|LOG_PANIC,
1682 "expansion of \"%s\" failed after matching "
1683 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1684 }
1685 else
1686 {
1687 int start, end, domain;
1688 uschar *errmess;
1689 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1690 &start, &end, &domain, TRUE);
1691 if (newsender != NULL)
1692 {
1693 if (domain == 0 && newsender[0] != 0)
1694 newsender = rewrite_address_qualify(newsender, FALSE);
1695
1696 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1697 {
1698 sender_address = newsender;
1699
1700 if (trusted_caller || filter_test != FTEST_NONE)
1701 {
1702 authenticated_sender = NULL;
1703 originator_name = US"";
1704 sender_local = FALSE;
1705 }
1706
1707 if (filter_test != FTEST_NONE)
1708 printf("Sender taken from \"From \" line\n");
1709 }
1710 }
1711 }
1712 }
1713 }
1714
1715 /* Not a leading "From " line. Check to see if it is a valid header line.
1716 Header names may contain any non-control characters except space and colon,
1717 amazingly. */
1718
1719 else
1720 {
1721 uschar *p = next->text;
1722
1723 /* If not a valid header line, break from the header reading loop, leaving
1724 next != NULL, indicating that it holds the first line of the body. */
1725
1726 if (isspace(*p)) break;
1727 while (mac_isgraph(*p) && *p != ':') p++;
1728 while (isspace(*p)) p++;
1729 if (*p != ':')
1730 {
1731 body_zerocount = had_zero;
1732 break;
1733 }
1734
1735 /* We have a valid header line. If there were any binary zeroes in
1736 the line, stomp on them here. */
1737
1738 if (had_zero > 0)
1739 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1740
1741 /* It is perfectly legal to have an empty continuation line
1742 at the end of a header, but it is confusing to humans
1743 looking at such messages, since it looks like a blank line.
1744 Reduce confusion by removing redundant white space at the
1745 end. We know that there is at least one printing character
1746 (the ':' tested for above) so there is no danger of running
1747 off the end. */
1748
1749 p = next->text + ptr - 2;
1750 for (;;)
1751 {
1752 while (*p == ' ' || *p == '\t') p--;
1753 if (*p != '\n') break;
1754 ptr = (p--) - next->text + 1;
1755 message_size -= next->slen - ptr;
1756 next->text[ptr] = 0;
1757 next->slen = ptr;
1758 }
1759
1760 /* Add the header to the chain */
1761
1762 next->type = htype_other;
1763 next->next = NULL;
1764 header_last->next = next;
1765 header_last = next;
1766
1767 /* Check the limit for individual line lengths. This comes after adding to
1768 the chain so that the failing line is reflected if a bounce is generated
1769 (for a local message). */
1770
1771 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1772 {
1773 log_write(0, LOG_MAIN, "overlong message header line received from "
1774 "%s (more than %d characters): message abandoned",
1775 sender_host_unknown? sender_ident : sender_fullhost,
1776 header_line_maxsize);
1777
1778 if (smtp_input)
1779 {
1780 smtp_reply = US"552 A message header line is too long";
1781 receive_swallow_smtp();
1782 goto TIDYUP; /* Skip to end of function */
1783 }
1784
1785 else
1786 {
1787 give_local_error(ERRMESS_VLONGHDRLINE,
1788 string_sprintf("message header line longer than %d characters "
1789 "received: message not accepted", header_line_maxsize), US"",
1790 error_rc, stdin, header_list->next);
1791 /* Does not return */
1792 }
1793 }
1794
1795 /* Note if any resent- fields exist. */
1796
1797 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1798 {
1799 resents_exist = TRUE;
1800 resent_prefix = US"Resent-";
1801 }
1802 }
1803
1804 /* The line has been handled. If we have hit EOF, break out of the loop,
1805 indicating no pending data line. */
1806
1807 if (ch == EOF) { next = NULL; break; }
1808
1809 /* Set up for the next header */
1810
1811 header_size = 256;
1812 next = store_get(sizeof(header_line));
1813 next->text = store_get(header_size);
1814 ptr = 0;
1815 had_zero = 0;
1816 } /* Continue, starting to read the next header */
1817
1818 /* At this point, we have read all the headers into a data structure in main
1819 store. The first header is still the dummy placeholder for the Received: header
1820 we are going to generate a bit later on. If next != NULL, it contains the first
1821 data line - which terminated the headers before reaching a blank line (not the
1822 normal case). */
1823
1824 DEBUG(D_receive)
1825 {
1826 debug_printf(">>Headers received:\n");
1827 for (h = header_list->next; h != NULL; h = h->next)
1828 debug_printf("%s", h->text);
1829 debug_printf("\n");
1830 }
1831
1832 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1833 is dropped immediately after valid headers, the next thing we will see is EOF.
1834 We must test for this specially, as further down the reading of the data is
1835 skipped if already at EOF. */
1836
1837 if (smtp_input && (receive_feof)())
1838 {
1839 smtp_reply = handle_lost_connection(US" (after header)");
1840 smtp_yield = FALSE;
1841 goto TIDYUP; /* Skip to end of function */
1842 }
1843
1844 /* If this is a filter test run and no headers were read, output a warning
1845 in case there is a mistake in the test message. */
1846
1847 if (filter_test != FTEST_NONE && header_list->next == NULL)
1848 printf("Warning: no message headers read\n");
1849
1850
1851 /* Scan the headers to identify them. Some are merely marked for later
1852 processing; some are dealt with here. */
1853
1854 for (h = header_list->next; h != NULL; h = h->next)
1855 {
1856 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1857 if (is_resent) contains_resent_headers = TRUE;
1858
1859 switch (header_checkname(h, is_resent))
1860 {
1861 case htype_bcc:
1862 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
1863 break;
1864
1865 case htype_cc:
1866 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
1867 break;
1868
1869 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1870
1871 case htype_date:
1872 date_header_exists = !resents_exist || is_resent;
1873 break;
1874
1875 /* Same comments as about Return-Path: below. */
1876
1877 case htype_delivery_date:
1878 if (delivery_date_remove) h->type = htype_old;
1879 break;
1880
1881 /* Same comments as about Return-Path: below. */
1882
1883 case htype_envelope_to:
1884 if (envelope_to_remove) h->type = htype_old;
1885 break;
1886
1887 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1888 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1889 header consists of just the login id of the user who called Exim, rewrite
1890 it with the gecos field first. Apply this rule to Resent-From: if there
1891 are resent- fields. */
1892
1893 case htype_from:
1894 h->type = htype_from;
1895 if (!resents_exist || is_resent)
1896 {
1897 from_header = h;
1898 if (!smtp_input)
1899 {
1900 uschar *s = Ustrchr(h->text, ':') + 1;
1901 while (isspace(*s)) s++;
1902 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1903 {
1904 uschar *name = is_resent? US"Resent-From" : US"From";
1905 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1906 originator_login, qualify_domain_sender);
1907 from_header = header_last;
1908 h->type = htype_old;
1909 DEBUG(D_receive|D_rewrite)
1910 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1911 }
1912 }
1913 }
1914 break;
1915
1916 /* Identify the Message-id: header for generating "in-reply-to" in the
1917 autoreply transport. For incoming logging, save any resent- value. In both
1918 cases, take just the first of any multiples. */
1919
1920 case htype_id:
1921 if (msgid_header == NULL && (!resents_exist || is_resent))
1922 {
1923 msgid_header = h;
1924 h->type = htype_id;
1925 }
1926 break;
1927
1928 /* Flag all Received: headers */
1929
1930 case htype_received:
1931 h->type = htype_received;
1932 received_count++;
1933 break;
1934
1935 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1936
1937 case htype_reply_to:
1938 h->type = htype_reply_to;
1939 break;
1940
1941 /* The Return-path: header is supposed to be added to messages when
1942 they leave the SMTP system. We shouldn't receive messages that already
1943 contain Return-path. However, since Exim generates Return-path: on
1944 local delivery, resent messages may well contain it. We therefore
1945 provide an option (which defaults on) to remove any Return-path: headers
1946 on input. Removal actually means flagging as "old", which prevents the
1947 header being transmitted with the message. */
1948
1949 case htype_return_path:
1950 if (return_path_remove) h->type = htype_old;
1951
1952 /* If we are testing a mail filter file, use the value of the
1953 Return-Path: header to set up the return_path variable, which is not
1954 otherwise set. However, remove any <> that surround the address
1955 because the variable doesn't have these. */
1956
1957 if (filter_test != FTEST_NONE)
1958 {
1959 uschar *start = h->text + 12;
1960 uschar *end = start + Ustrlen(start);
1961 while (isspace(*start)) start++;
1962 while (end > start && isspace(end[-1])) end--;
1963 if (*start == '<' && end[-1] == '>')
1964 {
1965 start++;
1966 end--;
1967 }
1968 return_path = string_copyn(start, end - start);
1969 printf("Return-path taken from \"Return-path:\" header line\n");
1970 }
1971 break;
1972
1973 /* If there is a "Sender:" header and the message is locally originated,
1974 and from an untrusted caller and suppress_local_fixups is not set, or if we
1975 are in submission mode for a remote message, mark it "old" so that it will
1976 not be transmitted with the message, unless active_local_sender_retain is
1977 set. (This can only be true if active_local_from_check is false.) If there
1978 are any resent- headers in the message, apply this rule to Resent-Sender:
1979 instead of Sender:. Messages with multiple resent- header sets cannot be
1980 tidily handled. (For this reason, at least one MUA - Pine - turns old
1981 resent- headers into X-resent- headers when resending, leaving just one
1982 set.) */
1983
1984 case htype_sender:
1985 h->type = ((!active_local_sender_retain &&
1986 (
1987 (sender_local && !trusted_caller && !suppress_local_fixups)
1988 || submission_mode
1989 )
1990 ) &&
1991 (!resents_exist||is_resent))?
1992 htype_old : htype_sender;
1993 break;
1994
1995 /* Remember the Subject: header for logging. There is no Resent-Subject */
1996
1997 case htype_subject:
1998 subject_header = h;
1999 break;
2000
2001 /* "To:" gets flagged, and the existence of a recipient header is noted,
2002 whether it's resent- or not. */
2003
2004 case htype_to:
2005 h->type = htype_to;
2006 /****
2007 to_or_cc_header_exists = TRUE;
2008 ****/
2009 break;
2010 }
2011 }
2012
2013 /* Extract recipients from the headers if that is required (the -t option).
2014 Note that this is documented as being done *before* any address rewriting takes
2015 place. There are two possibilities:
2016
2017 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2018 recipients already listed are to be REMOVED from the message. Smail 3 works
2019 like this. We need to build a non-recipients tree for that list, because in
2020 subsequent processing this data is held in a tree and that's what the
2021 spool_write_header() function expects. Make sure that non-recipient addresses
2022 are fully qualified and rewritten if necessary.
2023
2024 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2025 those in the command line arguments (and it is rumoured some other MTAs do
2026 this). Therefore, there is an option to make Exim behave this way.
2027
2028 *** Notes on "Resent-" header lines ***
2029
2030 The presence of resent-headers in the message makes -t horribly ambiguous.
2031 Experiments with sendmail showed that it uses recipients for all resent-
2032 headers, totally ignoring the concept of "sets of resent- headers" as described
2033 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2034 with all the addresses in one instance of each header.
2035
2036 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2037 error for -t if there were resent- headers in the message. However, after a
2038 discussion on the mailing list, I've learned that there are MUAs that use
2039 resent- headers with -t, and also that the stuff about sets of resent- headers
2040 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2041 message with -t and resent- header lines makes sure that only *its* resent-
2042 headers are present; previous ones are often renamed as X-resent- for example.
2043
2044 Consequently, Exim has been changed so that, if any resent- header lines are
2045 present, the recipients are taken from all of the appropriate resent- lines,
2046 and not from the ordinary To:, Cc:, etc. */
2047
2048 if (extract_recip)
2049 {
2050 int rcount = 0;
2051 error_block **bnext = &bad_addresses;
2052
2053 if (extract_addresses_remove_arguments)
2054 {
2055 while (recipients_count-- > 0)
2056 {
2057 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2058 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2059 tree_add_nonrecipient(s);
2060 }
2061 recipients_list = NULL;
2062 recipients_count = recipients_list_max = 0;
2063 }
2064
2065 /* Now scan the headers */
2066
2067 for (h = header_list->next; h != NULL; h = h->next)
2068 {
2069 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2070 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2071 {
2072 uschar *s = Ustrchr(h->text, ':') + 1;
2073 while (isspace(*s)) s++;
2074
2075 parse_allow_group = TRUE; /* Allow address group syntax */
2076
2077 while (*s != 0)
2078 {
2079 uschar *ss = parse_find_address_end(s, FALSE);
2080 uschar *recipient, *errmess, *p, *pp;
2081 int start, end, domain;
2082
2083 /* Check on maximum */
2084
2085 if (recipients_max > 0 && ++rcount > recipients_max)
2086 {
2087 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2088 US"message rejected: ", error_rc, stdin, NULL);
2089 /* Does not return */
2090 }
2091
2092 /* Make a copy of the address, and remove any internal newlines. These
2093 may be present as a result of continuations of the header line. The
2094 white space that follows the newline must not be removed - it is part
2095 of the header. */
2096
2097 pp = recipient = store_get(ss - s + 1);
2098 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2099 *pp = 0;
2100 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2101 &domain, FALSE);
2102
2103 /* Keep a list of all the bad addresses so we can send a single
2104 error message at the end. However, an empty address is not an error;
2105 just ignore it. This can come from an empty group list like
2106
2107 To: Recipients of list:;
2108
2109 If there are no recipients at all, an error will occur later. */
2110
2111 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2112 {
2113 int len = Ustrlen(s);
2114 error_block *b = store_get(sizeof(error_block));
2115 while (len > 0 && isspace(s[len-1])) len--;
2116 b->next = NULL;
2117 b->text1 = string_printing(string_copyn(s, len));
2118 b->text2 = errmess;
2119 *bnext = b;
2120 bnext = &(b->next);
2121 }
2122
2123 /* If the recipient is already in the nonrecipients tree, it must
2124 have appeared on the command line with the option extract_addresses_
2125 remove_arguments set. Do not add it to the recipients, and keep a note
2126 that this has happened, in order to give a better error if there are
2127 no recipients left. */
2128
2129 else if (recipient != NULL)
2130 {
2131 if (tree_search(tree_nonrecipients, recipient) == NULL)
2132 receive_add_recipient(recipient, -1);
2133 else
2134 extracted_ignored = TRUE;
2135 }
2136
2137 /* Move on past this address */
2138
2139 s = ss + (*ss? 1:0);
2140 while (isspace(*s)) s++;
2141 } /* Next address */
2142
2143 parse_allow_group = FALSE; /* Reset group syntax flags */
2144 parse_found_group = FALSE;
2145
2146 /* If this was the bcc: header, mark it "old", which means it
2147 will be kept on the spool, but not transmitted as part of the
2148 message. */
2149
2150 if (h->type == htype_bcc) h->type = htype_old;
2151 } /* For appropriate header line */
2152 } /* For each header line */
2153
2154 }
2155
2156 /* Now build the unique message id. This has changed several times over the
2157 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2158 Retaining all the history in the comment has become too unwieldy - read
2159 previous release sources if you want it.
2160
2161 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2162 The first part is the current time, in seconds. The second part is the current
2163 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2164 can hold a number in the range 0-3843. It used to be a computed sequence
2165 number, but is now the fractional component of the current time in units of
2166 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2167 received, Exim ensures that the timer has ticked at the appropriate level
2168 before proceeding, to avoid duplication if the pid happened to be re-used
2169 within the same time period. It seems likely that most messages will take at
2170 least half a millisecond to be received, so no delay will normally be
2171 necessary. At least for some time...
2172
2173 There is a modification when localhost_number is set. Formerly this was allowed
2174 to be as large as 255. Now it is restricted to the range 0-16, and the final
2175 component of the message id becomes (localhost_number * 200) + fractional time
2176 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2177
2178 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2179 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2180 still allows the tttttt field to hold a large enough number to last for some
2181 more decades, and the final two-digit field can hold numbers up to 1295, which
2182 is enough for milliseconds (instead of 1/2000 of a second).
2183
2184 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2185 pid, so it is probably safe because pids have to be positive. The
2186 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2187 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2188
2189 Note that string_base62() returns its data in a static storage block, so it
2190 must be copied before calling string_base62() again. It always returns exactly
2191 6 characters.
2192
2193 There doesn't seem to be anything in the RFC which requires a message id to
2194 start with a letter, but Smail was changed to ensure this. The external form of
2195 the message id (as supplied by string expansion) therefore starts with an
2196 additional leading 'E'. The spool file names do not include this leading
2197 letter and it is not used internally.
2198
2199 NOTE: If ever the format of message ids is changed, the regular expression for
2200 checking that a string is in this format must be updated in a corresponding
2201 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2202 must also be changed to reflect the correct string length. Then, of course,
2203 other programs that rely on the message id format will need updating too. */
2204
2205 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2206 message_id[6] = '-';
2207 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2208
2209 /* Deal with the case where the host number is set. The value of the number was
2210 checked when it was read, to ensure it isn't too big. The timing granularity is
2211 left in id_resolution so that an appropriate wait can be done after receiving
2212 the message, if necessary (we hope it won't be). */
2213
2214 if (host_number_string != NULL)
2215 {
2216 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2217 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2218 string_base62((long int)(
2219 host_number * (1000000/id_resolution) +
2220 message_id_tv.tv_usec/id_resolution)) + 4);
2221 }
2222
2223 /* Host number not set: final field is just the fractional time at an
2224 appropriate resolution. */
2225
2226 else
2227 {
2228 id_resolution = (BASE_62 == 62)? 500 : 1000;
2229 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2230 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2231 }
2232
2233 /* Add the current message id onto the current process info string if
2234 it will fit. */
2235
2236 (void)string_format(process_info + process_info_len,
2237 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2238
2239 /* If we are using multiple input directories, set up the one for this message
2240 to be the least significant base-62 digit of the time of arrival. Otherwise
2241 ensure that it is an empty string. */
2242
2243 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2244
2245 /* Now that we have the message-id, if there is no message-id: header, generate
2246 one, but only for local (without suppress_local_fixups) or submission mode
2247 messages. This can be user-configured if required, but we had better flatten
2248 any illegal characters therein. */
2249
2250 if (msgid_header == NULL &&
2251 ((sender_host_address == NULL && !suppress_local_fixups)
2252 || submission_mode))
2253 {
2254 uschar *p;
2255 uschar *id_text = US"";
2256 uschar *id_domain = primary_hostname;
2257
2258 /* Permit only letters, digits, dots, and hyphens in the domain */
2259
2260 if (message_id_domain != NULL)
2261 {
2262 uschar *new_id_domain = expand_string(message_id_domain);
2263 if (new_id_domain == NULL)
2264 {
2265 if (!expand_string_forcedfail)
2266 log_write(0, LOG_MAIN|LOG_PANIC,
2267 "expansion of \"%s\" (message_id_header_domain) "
2268 "failed: %s", message_id_domain, expand_string_message);
2269 }
2270 else if (*new_id_domain != 0)
2271 {
2272 id_domain = new_id_domain;
2273 for (p = id_domain; *p != 0; p++)
2274 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2275 }
2276 }
2277
2278 /* Permit all characters except controls and RFC 2822 specials in the
2279 additional text part. */
2280
2281 if (message_id_text != NULL)
2282 {
2283 uschar *new_id_text = expand_string(message_id_text);
2284 if (new_id_text == NULL)
2285 {
2286 if (!expand_string_forcedfail)
2287 log_write(0, LOG_MAIN|LOG_PANIC,
2288 "expansion of \"%s\" (message_id_header_text) "
2289 "failed: %s", message_id_text, expand_string_message);
2290 }
2291 else if (*new_id_text != 0)
2292 {
2293 id_text = new_id_text;
2294 for (p = id_text; *p != 0; p++)
2295 if (mac_iscntrl_or_special(*p)) *p = '-';
2296 }
2297 }
2298
2299 /* Add the header line */
2300
2301 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2302 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2303 }
2304
2305 /* If we are to log recipients, keep a copy of the raw ones before any possible
2306 rewriting. Must copy the count, because later ACLs and the local_scan()
2307 function may mess with the real recipients. */
2308
2309 if ((log_extra_selector & LX_received_recipients) != 0)
2310 {
2311 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2312 for (i = 0; i < recipients_count; i++)
2313 raw_recipients[i] = string_copy(recipients_list[i].address);
2314 raw_recipients_count = recipients_count;
2315 }
2316
2317 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2318 recipients will get here only if the conditions were right (allow_unqualified_
2319 recipient is TRUE). */
2320
2321 for (i = 0; i < recipients_count; i++)
2322 recipients_list[i].address =
2323 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2324 global_rewrite_rules, rewrite_existflags);
2325
2326 /* If there is no From: header, generate one for local (without
2327 suppress_local_fixups) or submission_mode messages. If there is no sender
2328 address, but the sender is local or this is a local delivery error, use the
2329 originator login. This shouldn't happen for genuine bounces, but might happen
2330 for autoreplies. The addition of From: must be done *before* checking for the
2331 possible addition of a Sender: header, because untrusted_set_sender allows an
2332 untrusted user to set anything in the envelope (which might then get info
2333 From:) but we still want to ensure a valid Sender: if it is required. */
2334
2335 if (from_header == NULL &&
2336 ((sender_host_address == NULL && !suppress_local_fixups)
2337 || submission_mode))
2338 {
2339 uschar *oname = US"";
2340
2341 /* Use the originator_name if this is a locally submitted message and the
2342 caller is not trusted. For trusted callers, use it only if -F was used to
2343 force its value or if we have a non-SMTP message for which -f was not used
2344 to set the sender. */
2345
2346 if (sender_host_address == NULL)
2347 {
2348 if (!trusted_caller || sender_name_forced ||
2349 (!smtp_input && !sender_address_forced))
2350 oname = originator_name;
2351 }
2352
2353 /* For non-locally submitted messages, the only time we use the originator
2354 name is when it was forced by the /name= option on control=submission. */
2355
2356 else
2357 {
2358 if (submission_name != NULL) oname = submission_name;
2359 }
2360
2361 /* Envelope sender is empty */
2362
2363 if (sender_address[0] == 0)
2364 {
2365 uschar *fromstart, *fromend;
2366
2367 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2368 oname, (oname[0] == 0)? "" : " <");
2369 fromend = (oname[0] == 0)? US"" : US">";
2370
2371 if (sender_local || local_error_message)
2372 {
2373 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2374 local_part_quote(originator_login), qualify_domain_sender,
2375 fromend);
2376 }
2377 else if (submission_mode && authenticated_id != NULL)
2378 {
2379 if (submission_domain == NULL)
2380 {
2381 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2382 local_part_quote(authenticated_id), qualify_domain_sender,
2383 fromend);
2384 }
2385 else if (submission_domain[0] == 0) /* empty => whole address set */
2386 {
2387 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2388 fromend);
2389 }
2390 else
2391 {
2392 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2393 local_part_quote(authenticated_id), submission_domain,
2394 fromend);
2395 }
2396 from_header = header_last; /* To get it checked for Sender: */
2397 }
2398 }
2399
2400 /* There is a non-null envelope sender. Build the header using the original
2401 sender address, before any rewriting that might have been done while
2402 verifying it. */
2403
2404 else
2405 {
2406 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2407 oname,
2408 (oname[0] == 0)? "" : " <",
2409 (sender_address_unrewritten == NULL)?
2410 sender_address : sender_address_unrewritten,
2411 (oname[0] == 0)? "" : ">");
2412
2413 from_header = header_last; /* To get it checked for Sender: */
2414 }
2415 }
2416
2417
2418 /* If the sender is local (without suppress_local_fixups), or if we are in
2419 submission mode and there is an authenticated_id, check that an existing From:
2420 is correct, and if not, generate a Sender: header, unless disabled. Any
2421 previously-existing Sender: header was removed above. Note that sender_local,
2422 as well as being TRUE if the caller of exim is not trusted, is also true if a
2423 trusted caller did not supply a -f argument for non-smtp input. To allow
2424 trusted callers to forge From: without supplying -f, we have to test explicitly
2425 here. If the From: header contains more than one address, then the call to
2426 parse_extract_address fails, and a Sender: header is inserted, as required. */
2427
2428 if (from_header != NULL &&
2429 (active_local_from_check &&
2430 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2431 (submission_mode && authenticated_id != NULL))
2432 ))
2433 {
2434 BOOL make_sender = TRUE;
2435 int start, end, domain;
2436 uschar *errmess;
2437 uschar *from_address =
2438 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2439 &start, &end, &domain, FALSE);
2440 uschar *generated_sender_address;
2441
2442 if (submission_mode)
2443 {
2444 if (submission_domain == NULL)
2445 {
2446 generated_sender_address = string_sprintf("%s@%s",
2447 local_part_quote(authenticated_id), qualify_domain_sender);
2448 }
2449 else if (submission_domain[0] == 0) /* empty => full address */
2450 {
2451 generated_sender_address = string_sprintf("%s",
2452 authenticated_id);
2453 }
2454 else
2455 {
2456 generated_sender_address = string_sprintf("%s@%s",
2457 local_part_quote(authenticated_id), submission_domain);
2458 }
2459 }
2460 else
2461 generated_sender_address = string_sprintf("%s@%s",
2462 local_part_quote(originator_login), qualify_domain_sender);
2463
2464 /* Remove permitted prefixes and suffixes from the local part of the From:
2465 address before doing the comparison with the generated sender. */
2466
2467 if (from_address != NULL)
2468 {
2469 int slen;
2470 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2471
2472 if (at != NULL) *at = 0;
2473 from_address += route_check_prefix(from_address, local_from_prefix);
2474 slen = route_check_suffix(from_address, local_from_suffix);
2475 if (slen > 0)
2476 {
2477 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2478 from_address += slen;
2479 }
2480 if (at != NULL) *at = '@';
2481
2482 if (strcmpic(generated_sender_address, from_address) == 0 ||
2483 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2484 make_sender = FALSE;
2485 }
2486
2487 /* We have to cause the Sender header to be rewritten if there are
2488 appropriate rewriting rules. */
2489
2490 if (make_sender)
2491 {
2492 if (submission_mode && submission_name == NULL)
2493 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2494 generated_sender_address);
2495 else
2496 header_add(htype_sender, "%sSender: %s <%s>\n",
2497 resent_prefix,
2498 submission_mode? submission_name : originator_name,
2499 generated_sender_address);
2500 }
2501
2502 /* Ensure that a non-null envelope sender address corresponds to the
2503 submission mode sender address. */
2504
2505 if (submission_mode && sender_address[0] != 0)
2506 {
2507 if (sender_address_unrewritten == NULL)
2508 sender_address_unrewritten = sender_address;
2509 sender_address = generated_sender_address;
2510 log_write(L_address_rewrite, LOG_MAIN,
2511 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2512 sender_address_unrewritten, generated_sender_address);
2513 }
2514 }
2515
2516
2517 /* If there are any rewriting rules, apply them to the sender address, unless
2518 it has already been rewritten as part of verification for SMTP input. */
2519
2520 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2521 sender_address[0] != 0)
2522 {
2523 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2524 global_rewrite_rules, rewrite_existflags);
2525 DEBUG(D_receive|D_rewrite)
2526 debug_printf("rewritten sender = %s\n", sender_address);
2527 }
2528
2529
2530 /* The headers must be run through rewrite_header(), because it ensures that
2531 addresses are fully qualified, as well as applying any rewriting rules that may
2532 exist.
2533
2534 Qualification of header addresses in a message from a remote host happens only
2535 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2536 appropriate. For local messages, qualification always happens, unless -bnq is
2537 used to explicitly suppress it. No rewriting is done for an unqualified address
2538 that is left untouched.
2539
2540 We start at the second header, skipping our own Received:. This rewriting is
2541 documented as happening *after* recipient addresses are taken from the headers
2542 by the -t command line option. An added Sender: gets rewritten here. */
2543
2544 for (h = header_list->next; h != NULL; h = h->next)
2545 {
2546 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2547 rewrite_existflags, TRUE);
2548 if (newh != NULL) h = newh;
2549 }
2550
2551
2552 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2553 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2554 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2555 exists, this applies to the set of resent- headers rather than the normal set.
2556
2557 The requirement for a recipient header has been removed in RFC 2822. At this
2558 point in the code, earlier versions of Exim added a To: header for locally
2559 submitted messages, and an empty Bcc: header for others. In the light of the
2560 changes in RFC 2822, this was dropped in November 2003. */
2561
2562
2563 /* If there is no date header, generate one if the message originates locally
2564 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2565 submission mode flag is set. Messages without Date: are not valid, but it seems
2566 to be more confusing if Exim adds one to all remotely-originated messages. */
2567
2568 if (!date_header_exists &&
2569 ((sender_host_address == NULL && !suppress_local_fixups)
2570 || submission_mode))
2571 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2572
2573 search_tidyup(); /* Free any cached resources */
2574
2575 /* Show the complete set of headers if debugging. Note that the first one (the
2576 new Received:) has not yet been set. */
2577
2578 DEBUG(D_receive)
2579 {
2580 debug_printf(">>Headers after rewriting and local additions:\n");
2581 for (h = header_list->next; h != NULL; h = h->next)
2582 debug_printf("%c %s", h->type, h->text);
2583 debug_printf("\n");
2584 }
2585
2586 /* The headers are now complete in store. If we are running in filter
2587 testing mode, that is all this function does. Return TRUE if the message
2588 ended with a dot. */
2589
2590 if (filter_test != FTEST_NONE)
2591 {
2592 process_info[process_info_len] = 0;
2593 return message_ended == END_DOT;
2594 }
2595
2596 /* Open a new spool file for the data portion of the message. We need
2597 to access it both via a file descriptor and a stream. Try to make the
2598 directory if it isn't there. Note re use of sprintf: spool_directory
2599 is checked on input to be < 200 characters long. */
2600
2601 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2602 message_id);
2603 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2604 if (data_fd < 0)
2605 {
2606 if (errno == ENOENT)
2607 {
2608 uschar temp[16];
2609 sprintf(CS temp, "input/%s", message_subdir);
2610 if (message_subdir[0] == 0) temp[5] = 0;
2611 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2612 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2613 }
2614 if (data_fd < 0)
2615 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2616 spool_name, strerror(errno));
2617 }
2618
2619 /* Make sure the file's group is the Exim gid, and double-check the mode
2620 because the group setting doesn't always get set automatically. */
2621
2622 (void)fchown(data_fd, exim_uid, exim_gid);
2623 (void)fchmod(data_fd, SPOOL_MODE);
2624
2625 /* We now have data file open. Build a stream for it and lock it. We lock only
2626 the first line of the file (containing the message ID) because otherwise there
2627 are problems when Exim is run under Cygwin (I'm told). See comments in
2628 spool_in.c, where the same locking is done. */
2629
2630 data_file = fdopen(data_fd, "w+");
2631 lock_data.l_type = F_WRLCK;
2632 lock_data.l_whence = SEEK_SET;
2633 lock_data.l_start = 0;
2634 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2635
2636 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2637 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2638 errno, strerror(errno));
2639
2640 /* We have an open, locked data file. Write the message id to it to make it
2641 self-identifying. Then read the remainder of the input of this message and
2642 write it to the data file. If the variable next != NULL, it contains the first
2643 data line (which was read as a header but then turned out not to have the right
2644 format); write it (remembering that it might contain binary zeros). The result
2645 of fwrite() isn't inspected; instead we call ferror() below. */
2646
2647 fprintf(data_file, "%s-D\n", message_id);
2648 if (next != NULL)
2649 {
2650 uschar *s = next->text;
2651 int len = next->slen;
2652 (void)fwrite(s, 1, len, data_file);
2653 body_linecount++; /* Assumes only 1 line */
2654 }
2655
2656 /* Note that we might already be at end of file, or the logical end of file
2657 (indicated by '.'), or might have encountered an error while writing the
2658 message id or "next" line. */
2659
2660 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2661 {
2662 if (smtp_input)
2663 {
2664 message_ended = read_message_data_smtp(data_file);
2665 receive_linecount++; /* The terminating "." line */
2666 }
2667 else message_ended = read_message_data(data_file);
2668
2669 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2670 message_linecount += body_linecount;
2671
2672 /* Handle premature termination of SMTP */
2673
2674 if (smtp_input && message_ended == END_EOF)
2675 {
2676 Uunlink(spool_name); /* Lose data file when closed */
2677 message_id[0] = 0; /* Indicate no message accepted */
2678 smtp_reply = handle_lost_connection(US"");
2679 smtp_yield = FALSE;
2680 goto TIDYUP; /* Skip to end of function */
2681 }
2682
2683 /* Handle message that is too big. Don't use host_or_ident() in the log
2684 message; we want to see the ident value even for non-remote messages. */
2685
2686 if (message_ended == END_SIZE)
2687 {
2688 Uunlink(spool_name); /* Lose the data file when closed */
2689 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2690
2691 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2692 "message too big: read=%d max=%d",
2693 sender_address,
2694 (sender_fullhost == NULL)? "" : " H=",
2695 (sender_fullhost == NULL)? US"" : sender_fullhost,
2696 (sender_ident == NULL)? "" : " U=",
2697 (sender_ident == NULL)? US"" : sender_ident,
2698 message_size,
2699 thismessage_size_limit);
2700
2701 if (smtp_input)
2702 {
2703 smtp_reply = US"552 Message size exceeds maximum permitted";
2704 message_id[0] = 0; /* Indicate no message accepted */
2705 goto TIDYUP; /* Skip to end of function */
2706 }
2707 else
2708 {
2709 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2710 give_local_error(ERRMESS_TOOBIG,
2711 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2712 US"message rejected: ", error_rc, data_file, header_list);
2713 /* Does not return */
2714 }
2715 }
2716 }
2717
2718 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2719 example, there may be some expansion in an ACL that uses a timer.) */
2720
2721 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2722
2723 /* The message body has now been read into the data file. Call fflush() to
2724 empty the buffers in C, and then call fsync() to get the data written out onto
2725 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2726 having to do this). If there was an I/O error on either input or output,
2727 attempt to send an error message, and unlink the spool file. For non-SMTP input
2728 we can then give up. Note that for SMTP input we must swallow the remainder of
2729 the input in cases of output errors, since the far end doesn't expect to see
2730 anything until the terminating dot line is sent. */
2731
2732 if (fflush(data_file) == EOF || ferror(data_file) ||
2733 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2734 {
2735 uschar *msg_errno = US strerror(errno);
2736 BOOL input_error = (receive_ferror)() != 0;
2737 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2738 input_error? "Input read" : "Spool write",
2739 msg_errno,
2740 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2741
2742 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2743 Uunlink(spool_name); /* Lose the data file */
2744
2745 if (smtp_input)
2746 {
2747 if (input_error)
2748 smtp_reply = US"451 Error while reading input data";
2749 else
2750 {
2751 smtp_reply = US"451 Error while writing spool file";
2752 receive_swallow_smtp();
2753 }
2754 message_id[0] = 0; /* Indicate no message accepted */
2755 goto TIDYUP; /* Skip to end of function */
2756 }
2757
2758 else
2759 {
2760 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2761 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2762 header_list);
2763 /* Does not return */
2764 }
2765 }
2766
2767
2768 /* No I/O errors were encountered while writing the data file. */
2769
2770 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2771
2772
2773 /* If there were any bad addresses extracted by -t, or there were no recipients
2774 left after -t, send a message to the sender of this message, or write it to
2775 stderr if the error handling option is set that way. Note that there may
2776 legitimately be no recipients for an SMTP message if they have all been removed
2777 by "discard".
2778
2779 We need to rewind the data file in order to read it. In the case of no
2780 recipients or stderr error writing, throw the data file away afterwards, and
2781 exit. (This can't be SMTP, which always ensures there's at least one
2782 syntactically good recipient address.) */
2783
2784 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2785 {
2786 DEBUG(D_receive)
2787 {
2788 if (recipients_count == 0) debug_printf("*** No recipients\n");
2789 if (bad_addresses != NULL)
2790 {
2791 error_block *eblock = bad_addresses;
2792 debug_printf("*** Bad address(es)\n");
2793 while (eblock != NULL)
2794 {
2795 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2796 eblock = eblock->next;
2797 }
2798 }
2799 }
2800
2801 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2802
2803 /* If configured to send errors to the sender, but this fails, force
2804 a failure error code. We use a special one for no recipients so that it
2805 can be detected by the autoreply transport. Otherwise error_rc is set to
2806 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2807 it is EXIT_SUCCESS. */
2808
2809 if (error_handling == ERRORS_SENDER)
2810 {
2811 if (!moan_to_sender(
2812 (bad_addresses == NULL)?
2813 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2814 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2815 bad_addresses, header_list, data_file, FALSE))
2816 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2817 }
2818 else
2819 {
2820 if (bad_addresses == NULL)
2821 {
2822 if (extracted_ignored)
2823 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2824 else
2825 fprintf(stderr, "exim: no recipients in message\n");
2826 }
2827 else
2828 {
2829 fprintf(stderr, "exim: invalid address%s",
2830 (bad_addresses->next == NULL)? ":" : "es:\n");
2831 while (bad_addresses != NULL)
2832 {
2833 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2834 bad_addresses->text2);
2835 bad_addresses = bad_addresses->next;
2836 }
2837 }
2838 }
2839
2840 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2841 {
2842 Uunlink(spool_name);
2843 (void)fclose(data_file);
2844 exim_exit(error_rc);
2845 }
2846 }
2847
2848 /* Data file successfully written. Generate text for the Received: header by
2849 expanding the configured string, and adding a timestamp. By leaving this
2850 operation till now, we ensure that the timestamp is the time that message
2851 reception was completed. However, this is deliberately done before calling the
2852 data ACL and local_scan().
2853
2854 This Received: header may therefore be inspected by the data ACL and by code in
2855 the local_scan() function. When they have run, we update the timestamp to be
2856 the final time of reception.
2857
2858 If there is just one recipient, set up its value in the $received_for variable
2859 for use when we generate the Received: header.
2860
2861 Note: the checking for too many Received: headers is handled by the delivery
2862 code. */
2863
2864 timestamp = expand_string(US"${tod_full}");
2865 if (recipients_count == 1) received_for = recipients_list[0].address;
2866 received = expand_string(received_header_text);
2867 received_for = NULL;
2868
2869 if (received == NULL)
2870 {
2871 Uunlink(spool_name); /* Lose the data file */
2872 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2873 "(received_header_text) failed: %s", string_printing(received_header_text),
2874 expand_string_message);
2875 }
2876
2877 /* The first element on the header chain is reserved for the Received header,
2878 so all we have to do is fill in the text pointer, and set the type. However, if
2879 the result of the expansion is an empty string, we leave the header marked as
2880 "old" so as to refrain from adding a Received header. */
2881
2882 if (received[0] == 0)
2883 {
2884 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2885 received_header->type = htype_old;
2886 }
2887 else
2888 {
2889 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2890 received_header->type = htype_received;
2891 }
2892
2893 received_header->slen = Ustrlen(received_header->text);
2894
2895 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2896 received_header->type, received_header->text);
2897
2898 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2899
2900 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2901 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2902
2903 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2904 now, before running the DATA ACL. */
2905
2906 add_acl_headers(US"MAIL or RCPT");
2907
2908 /* If an ACL is specified for checking things at this stage of reception of a
2909 message, run it, unless all the recipients were removed by "discard" in earlier
2910 ACLs. That is the only case in which recipients_count can be zero at this
2911 stage. Set deliver_datafile to point to the data file so that $message_body and
2912 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2913 */
2914
2915 deliver_datafile = data_fd;
2916 user_msg = NULL;
2917
2918 enable_dollar_recipients = TRUE;
2919
2920 if (recipients_count == 0)
2921 {
2922 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2923 }
2924 else
2925 {
2926 /* Handle interactive SMTP messages */
2927
2928 if (smtp_input && !smtp_batched_input)
2929 {
2930
2931 #ifdef EXPERIMENTAL_DOMAINKEYS
2932 dk_exim_verify_finish();
2933 #endif
2934
2935 #ifdef WITH_CONTENT_SCAN
2936 if (acl_smtp_mime != NULL &&
2937 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
2938 goto TIDYUP;
2939 #endif /* WITH_CONTENT_SCAN */
2940
2941 /* Check the recipients count again, as the MIME ACL might have changed
2942 them. */
2943
2944 if (acl_smtp_data != NULL && recipients_count > 0)
2945 {
2946 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
2947 add_acl_headers(US"DATA");
2948 if (rc == DISCARD)
2949 {
2950 recipients_count = 0;
2951 blackholed_by = US"DATA ACL";
2952 if (log_msg != NULL)
2953 blackhole_log_msg = string_sprintf(": %s", log_msg);
2954 }
2955 else if (rc != OK)
2956 {
2957 Uunlink(spool_name);
2958 #ifdef WITH_CONTENT_SCAN
2959 unspool_mbox();
2960 #endif
2961 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
2962 smtp_yield = FALSE; /* No more messsages after dropped connection */
2963 smtp_reply = US""; /* Indicate reply already sent */
2964 message_id[0] = 0; /* Indicate no message accepted */
2965 goto TIDYUP; /* Skip to end of function */
2966 }
2967 }
2968 }
2969
2970 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
2971 we cannot take different actions for permanent and temporary rejections. */
2972
2973 else
2974 {
2975
2976 #ifdef WITH_CONTENT_SCAN
2977 if (acl_not_smtp_mime != NULL &&
2978 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
2979 &blackholed_by))
2980 goto TIDYUP;
2981 #endif /* WITH_CONTENT_SCAN */
2982
2983 if (acl_not_smtp != NULL)
2984 {
2985 uschar *user_msg, *log_msg;
2986 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
2987 if (rc == DISCARD)
2988 {
2989 recipients_count = 0;
2990 blackholed_by = US"non-SMTP ACL";
2991 if (log_msg != NULL)
2992 blackhole_log_msg = string_sprintf(": %s", log_msg);
2993 }
2994 else if (rc != OK)
2995 {
2996 Uunlink(spool_name);
2997 #ifdef WITH_CONTENT_SCAN
2998 unspool_mbox();
2999 #endif
3000 /* The ACL can specify where rejections are to be logged, possibly
3001 nowhere. The default is main and reject logs. */
3002
3003 if (log_reject_target != 0)
3004 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3005 sender_address, log_msg);
3006
3007 if (user_msg == NULL) user_msg = US"local configuration problem";
3008 if (smtp_batched_input)
3009 {
3010 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3011 /* Does not return */
3012 }
3013 else
3014 {
3015 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3016 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3017 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3018 header_list);
3019 /* Does not return */
3020 }
3021 }
3022 add_acl_headers(US"non-SMTP");
3023 }
3024 }
3025
3026 /* The applicable ACLs have been run */
3027
3028 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3029 if (queue_only_policy) queued_by = US"ACL";
3030 }
3031
3032 #ifdef WITH_CONTENT_SCAN
3033 unspool_mbox();
3034 #endif
3035
3036 /* The final check on the message is to run the scan_local() function. The
3037 version supplied with Exim always accepts, but this is a hook for sysadmins to
3038 supply their own checking code. The local_scan() function is run even when all
3039 the recipients have been discarded. */
3040
3041 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3042
3043 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3044 deleted, and the incident gets logged. */
3045
3046 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3047 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3048 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3049 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3050
3051 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3052 local_scan_timeout);
3053 local_scan_data = NULL;
3054
3055 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3056 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3057 rc = local_scan(data_fd, &local_scan_data);
3058 alarm(0);
3059 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3060
3061 enable_dollar_recipients = FALSE;
3062
3063 store_pool = POOL_MAIN; /* In case changed */
3064 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3065 local_scan_data);
3066
3067 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3068 os_non_restarting_signal(SIGFPE, SIG_DFL);
3069 os_non_restarting_signal(SIGILL, SIG_DFL);
3070 os_non_restarting_signal(SIGBUS, SIG_DFL);
3071
3072 /* The length check is paranoia against some runaway code, and also because
3073 (for a success return) lines in the spool file are read into big_buffer. */
3074
3075 if (local_scan_data != NULL)
3076 {
3077 int len = Ustrlen(local_scan_data);
3078 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3079 local_scan_data = string_copyn(local_scan_data, len);
3080 }
3081
3082 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3083 {
3084 if (!deliver_freeze) /* ACL might have already frozen */
3085 {
3086 deliver_freeze = TRUE;
3087 deliver_frozen_at = time(NULL);
3088 frozen_by = US"local_scan()";
3089 }
3090 rc = LOCAL_SCAN_ACCEPT;
3091 }
3092 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3093 {
3094 if (!queue_only_policy) /* ACL might have already queued */
3095 {
3096 queue_only_policy = TRUE;
3097 queued_by = US"local_scan()";
3098 }
3099 rc = LOCAL_SCAN_ACCEPT;
3100 }
3101
3102 /* Message accepted: remove newlines in local_scan_data because otherwise
3103 the spool file gets corrupted. Ensure that all recipients are qualified. */
3104
3105 if (rc == LOCAL_SCAN_ACCEPT)
3106 {
3107 if (local_scan_data != NULL)
3108 {
3109 uschar *s;
3110 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3111 }
3112 for (i = 0; i < recipients_count; i++)
3113 {
3114 recipient_item *r = recipients_list + i;
3115 r->address = rewrite_address_qualify(r->address, TRUE);
3116 if (r->errors_to != NULL)
3117 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3118 }
3119 if (recipients_count == 0 && blackholed_by == NULL)
3120 blackholed_by = US"local_scan";
3121 }
3122
3123 /* Message rejected: newlines permitted in local_scan_data to generate
3124 multiline SMTP responses. */
3125
3126 else
3127 {
3128 uschar *istemp = US"";
3129 uschar *s = NULL;
3130 uschar *smtp_code;
3131 int size = 0;
3132 int sptr = 0;
3133
3134 errmsg = local_scan_data;
3135
3136 Uunlink(spool_name); /* Cancel this message */
3137 switch(rc)
3138 {
3139 default:
3140 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3141 "rejection given", rc);
3142 goto TEMPREJECT;
3143
3144 case LOCAL_SCAN_REJECT_NOLOGHDR:
3145 log_extra_selector &= ~LX_rejected_header;
3146 /* Fall through */
3147
3148 case LOCAL_SCAN_REJECT:
3149 smtp_code = US"550";
3150 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3151 break;
3152
3153 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3154 log_extra_selector &= ~LX_rejected_header;
3155 /* Fall through */
3156
3157 case LOCAL_SCAN_TEMPREJECT:
3158 TEMPREJECT:
3159 smtp_code = US"451";
3160 if (errmsg == NULL) errmsg = US"Temporary local problem";
3161 istemp = US"temporarily ";
3162 break;
3163 }
3164
3165 s = string_append(s, &size, &sptr, 2, US"F=",
3166 (sender_address[0] == 0)? US"<>" : sender_address);
3167 s = add_host_info_for_log(s, &size, &sptr);
3168 s[sptr] = 0;
3169
3170 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3171 s, istemp, string_printing(errmsg));
3172
3173 if (smtp_input)
3174 {
3175 if (!smtp_batched_input)
3176 {
3177 smtp_respond(smtp_code, 3, TRUE, errmsg);
3178 message_id[0] = 0; /* Indicate no message accepted */
3179 smtp_reply = US""; /* Indicate reply already sent */
3180 goto TIDYUP; /* Skip to end of function */
3181 }
3182 else
3183 {
3184 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3185 /* Does not return */
3186 }
3187 }
3188 else
3189 {
3190 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3191 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3192 US"message rejected by local scan code: ", error_rc, data_file,
3193 header_list);
3194 /* Does not return */
3195 }
3196 }
3197
3198 /* Reset signal handlers to ignore signals that previously would have caused
3199 the message to be abandoned. */
3200
3201 signal(SIGTERM, SIG_IGN);
3202 signal(SIGINT, SIG_IGN);
3203
3204 /* Ensure the first time flag is set in the newly-received message. */
3205
3206 deliver_firsttime = TRUE;
3207
3208 #ifdef EXPERIMENTAL_BRIGHTMAIL
3209 if (bmi_run == 1) {
3210 /* rewind data file */
3211 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3212 bmi_verdicts = bmi_process_message(header_list, data_fd);
3213 };
3214 #endif
3215
3216 /* Update the timstamp in our Received: header to account for any time taken by
3217 an ACL or by local_scan(). The new time is the time that all reception
3218 processing is complete. */
3219
3220 timestamp = expand_string(US"${tod_full}");
3221 tslen = Ustrlen(timestamp);
3222
3223 memcpy(received_header->text + received_header->slen - tslen - 1,
3224 timestamp, tslen);
3225
3226 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3227
3228 if (mua_wrapper)
3229 {
3230 deliver_freeze = FALSE;
3231 queue_only_policy = FALSE;
3232 }
3233
3234 /* Keep the data file open until we have written the header file, in order to
3235 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3236 don't write the header file, and we unlink the data file. If writing the header
3237 file fails, we have failed to accept this message. */
3238
3239 if (host_checking || blackholed_by != NULL)
3240 {
3241 header_line *h;
3242 Uunlink(spool_name);
3243 msg_size = 0; /* Compute size for log line */
3244 for (h = header_list; h != NULL; h = h->next)
3245 if (h->type != '*') msg_size += h->slen;
3246 }
3247
3248 /* Write the -H file */
3249
3250 else
3251 {
3252 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3253 {
3254 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3255 Uunlink(spool_name); /* Lose the data file */
3256
3257 if (smtp_input)
3258 {
3259 smtp_reply = US"451 Error in writing spool file";
3260 message_id[0] = 0; /* Indicate no message accepted */
3261 goto TIDYUP;
3262 }
3263 else
3264 {
3265 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3266 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3267 header_list);
3268 /* Does not return */
3269 }
3270 }
3271 }
3272
3273
3274 /* The message has now been successfully received. */
3275
3276 receive_messagecount++;
3277
3278 /* In SMTP sessions we may receive several in one connection. After each one,
3279 we wait for the clock to tick at the level of message-id granularity. This is
3280 so that the combination of time+pid is unique, even on systems where the pid
3281 can be re-used within our time interval. We can't shorten the interval without
3282 re-designing the message-id. See comments above where the message id is
3283 created. This is Something For The Future. */
3284
3285 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3286 exim_wait_tick(&message_id_tv, id_resolution);
3287
3288 /* Add data size to written header size. We do not count the initial file name
3289 that is in the file, but we do add one extra for the notional blank line that
3290 precedes the data. This total differs from message_size in that it include the
3291 added Received: header and any other headers that got created locally. */
3292
3293 fflush(data_file);
3294 fstat(data_fd, &statbuf);
3295
3296 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3297
3298 /* Generate a "message received" log entry. We do this by building up a dynamic
3299 string as required. Since we commonly want to add two items at a time, use a
3300 macro to simplify the coding. We log the arrival of a new message while the
3301 file is still locked, just in case the machine is *really* fast, and delivers
3302 it first! Include any message id that is in the message - since the syntax of a
3303 message id is actually an addr-spec, we can use the parse routine to canonicize
3304 it. */
3305
3306 size = 256;
3307 sptr = 0;
3308 s = store_get(size);
3309
3310 s = string_append(s, &size, &sptr, 2, US"<= ",
3311 (sender_address[0] == 0)? US"<>" : sender_address);
3312 if (message_reference != NULL)
3313 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3314
3315 s = add_host_info_for_log(s, &size, &sptr);
3316
3317 #ifdef SUPPORT_TLS
3318 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3319 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3320 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3321 tls_cipher != NULL)
3322 s = string_append(s, &size, &sptr, 2, US" CV=",
3323 tls_certificate_verified? "yes":"no");
3324 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3325 s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\"");
3326 #endif
3327
3328 if (sender_host_authenticated != NULL)
3329 {
3330 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3331 if (authenticated_id != NULL)
3332 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3333 }
3334
3335 sprintf(CS big_buffer, "%d", msg_size);
3336 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3337
3338 /* If an addr-spec in a message-id contains a quoted string, it can contain
3339 any characters except " \ and CR and so in particular it can contain NL!
3340 Therefore, make sure we use a printing-characters only version for the log.
3341 Also, allow for domain literals in the message id. */
3342
3343 if (msgid_header != NULL)
3344 {
3345 uschar *old_id;
3346 BOOL save_allow_domain_literals = allow_domain_literals;
3347 allow_domain_literals = TRUE;
3348 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3349 &errmsg, &start, &end, &domain, FALSE);
3350 allow_domain_literals = save_allow_domain_literals;
3351 if (old_id != NULL)
3352 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3353 }
3354
3355 /* If subject logging is turned on, create suitable printing-character
3356 text. By expanding $h_subject: we make use of the MIME decoding. */
3357
3358 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3359 {
3360 int i;
3361 uschar *p = big_buffer;
3362 uschar *ss = expand_string(US"$h_subject:");
3363
3364 /* Backslash-quote any double quotes or backslashes so as to make a
3365 a C-like string, and turn any non-printers into escape sequences. */
3366
3367 *p++ = '\"';
3368 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3369 {
3370 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3371 *p++ = ss[i];
3372 }
3373 *p++ = '\"';
3374 *p = 0;
3375 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3376 }
3377
3378 /* Terminate the string: string_cat() and string_append() leave room, but do
3379 not put the zero in. */
3380
3381 s[sptr] = 0;
3382
3383 /* Create a message log file if message logs are being used and this message is
3384 not blackholed. Write the reception stuff to it. We used to leave message log
3385 creation until the first delivery, but this has proved confusing for somep
3386 people. */
3387
3388 if (message_logs && blackholed_by == NULL)
3389 {
3390 int fd;
3391
3392 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3393 message_id);
3394 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3395
3396 if (fd < 0 && errno == ENOENT)
3397 {
3398 uschar temp[16];
3399 sprintf(CS temp, "msglog/%s", message_subdir);
3400 if (message_subdir[0] == 0) temp[6] = 0;
3401 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3402 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3403 }
3404
3405 if (fd < 0)
3406 {
3407 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3408 spool_name, strerror(errno));
3409 }
3410
3411 else
3412 {
3413 FILE *message_log = fdopen(fd, "a");
3414 if (message_log == NULL)
3415 {
3416 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3417 spool_name, strerror(errno));
3418 (void)close(fd);
3419 }
3420 else
3421 {
3422 uschar *now = tod_stamp(tod_log);
3423 fprintf(message_log, "%s Received from %s\n", now, s+3);
3424 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3425 frozen_by);
3426 if (queue_only_policy) fprintf(message_log,
3427 "%s no immediate delivery: queued by %s\n", now, queued_by);
3428 (void)fclose(message_log);
3429 }
3430 }
3431 }
3432
3433 /* Everything has now been done for a successful message except logging its
3434 arrival, and outputting an SMTP response. While writing to the log, set a flag
3435 to cause a call to receive_bomb_out() if the log cannot be opened. */
3436
3437 receive_call_bombout = TRUE;
3438
3439 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3440 connection has gone away. This can only be done if there is no unconsumed input
3441 waiting in the local input buffer. We can test for this by calling
3442 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3443 input to be sent following the final dot, so the presence of following input is
3444 not an error.
3445
3446 If the connection is still present, but there is no unread input for the
3447 socket, the result of a select() call will be zero. If, however, the connection
3448 has gone away, or if there is pending input, the result of select() will be
3449 non-zero. The two cases can be distinguished by trying to read the next input
3450 character. If we succeed, we can unread it so that it remains in the local
3451 buffer for handling later. If not, the connection has been lost.
3452
3453 Of course, since TCP/IP is asynchronous, there is always a chance that the
3454 connection will vanish between the time of this test and the sending of the
3455 response, but the chance of this happening should be small. */
3456
3457 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3458 !receive_smtp_buffered())
3459 {
3460 struct timeval tv;
3461 fd_set select_check;
3462 FD_ZERO(&select_check);
3463 FD_SET(fileno(smtp_in), &select_check);
3464 tv.tv_sec = 0;
3465 tv.tv_usec = 0;
3466
3467 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3468 {
3469 int c = (RECEIVE_GETC)();
3470 if (c != EOF) (RECEIVE_UNGETC)(c); else
3471 {
3472 uschar *msg = US"SMTP connection lost after final dot";
3473 smtp_reply = US""; /* No attempt to send a response */
3474 smtp_yield = FALSE; /* Nothing more on this connection */
3475
3476 /* Re-use the log line workspace */
3477
3478 sptr = 0;
3479 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3480 s = add_host_info_for_log(s, &size, &sptr);
3481 s[sptr] = 0;
3482 log_write(0, LOG_MAIN, "%s", s);
3483
3484 /* Delete the files for this aborted message. */
3485
3486 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3487 message_subdir, message_id);
3488 Uunlink(spool_name);
3489
3490 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,