Added $max_received_linelength.
[exim.git] / src / src / receive.c
1 /* $Cambridge: exim/src/src/receive.c,v 1.38 2007/06/22 14:38:58 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 register int linelength = 0;
568
569 /* Handle the case when only EOF terminates the message */
570
571 if (!dot_ends)
572 {
573 register int last_ch = '\n';
574
575 for (; (ch = (RECEIVE_GETC)()) != EOF; last_ch = ch)
576 {
577 if (ch == 0) body_zerocount++;
578 if (last_ch == '\r' && ch != '\n')
579 {
580 if (linelength > max_received_linelength)
581 max_received_linelength = linelength;
582 linelength = 0;
583 if (fputc('\n', fout) == EOF) return END_WERROR;
584 message_size++;
585 body_linecount++;
586 }
587 if (ch == '\r') continue;
588
589 if (fputc(ch, fout) == EOF) return END_WERROR;
590 if (ch == '\n')
591 {
592 if (linelength > max_received_linelength)
593 max_received_linelength = linelength;
594 linelength = 0;
595 body_linecount++;
596 }
597 else linelength++;
598 if (++message_size > thismessage_size_limit) return END_SIZE;
599 }
600
601 if (last_ch != '\n')
602 {
603 if (linelength > max_received_linelength)
604 max_received_linelength = linelength;
605 if (fputc('\n', fout) == EOF) return END_WERROR;
606 message_size++;
607 body_linecount++;
608 }
609
610 return END_EOF;
611 }
612
613 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
614
615 ch_state = 1;
616
617 while ((ch = (RECEIVE_GETC)()) != EOF)
618 {
619 if (ch == 0) body_zerocount++;
620 switch (ch_state)
621 {
622 case 0: /* Normal state (previous char written) */
623 if (ch == '\n')
624 {
625 body_linecount++;
626 if (linelength > max_received_linelength)
627 max_received_linelength = linelength;
628 linelength = -1;
629 ch_state = 1;
630 }
631 else if (ch == '\r')
632 { ch_state = 2; continue; }
633 break;
634
635 case 1: /* After written "\n" */
636 if (ch == '.') { ch_state = 3; continue; }
637 if (ch != '\n') ch_state = 0; else linelength = -1;
638 break;
639
640 case 2:
641 body_linecount++; /* After unwritten "\r" */
642 if (linelength > max_received_linelength)
643 max_received_linelength = linelength;
644 if (ch == '\n')
645 {
646 ch_state = 1;
647 linelength = -1;
648 }
649 else
650 {
651 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
652 if (ch == '\r') continue;
653 ch_state = 0;
654 linelength = 0;
655 }
656 break;
657
658 case 3: /* After "\n." (\n written, dot not) */
659 if (ch == '\n') return END_DOT;
660 if (ch == '\r') { ch_state = 4; continue; }
661 message_size++;
662 linelength++;
663 if (fputc('.', fout) == EOF) return END_WERROR;
664 ch_state = 0;
665 break;
666
667 case 4: /* After "\n.\r" (\n written, rest not) */
668 if (ch == '\n') return END_DOT;
669 message_size += 2;
670 body_linecount++;
671 if (fputs(".\n", fout) == EOF) return END_WERROR;
672 if (ch == '\r') { ch_state = 2; continue; }
673 ch_state = 0;
674 break;
675 }
676
677 linelength++;
678 if (fputc(ch, fout) == EOF) return END_WERROR;
679 if (++message_size > thismessage_size_limit) return END_SIZE;
680 }
681
682 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
683 the message ends with a newline, and we must also write any characters that
684 were saved up while testing for an ending dot. */
685
686 if (ch_state != 1)
687 {
688 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
689 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
690 message_size += Ustrlen(ends[ch_state]);
691 body_linecount++;
692 }
693
694 return END_EOF;
695 }
696
697
698
699
700 /*************************************************
701 * Read data portion of an SMTP message *
702 *************************************************/
703
704 /* This function is called to read the remainder of an SMTP message (after the
705 headers), or to skip over it when an error has occurred. In this case, the
706 output file is passed as NULL.
707
708 If any line begins with a dot, that character is skipped. The input should only
709 be successfully terminated by CR LF . CR LF unless it is local (non-network)
710 SMTP, in which case the CRs are optional, but...
711
712 FUDGE: It seems that sites on the net send out messages with just LF
713 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
714 we make the CRs optional in all cases.
715
716 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
717 well, so that there are no CRs in spooled messages. However, the message
718 terminating dot is not recognized between two bare CRs.
719
720 Arguments:
721 fout a FILE to which to write the message; NULL if skipping
722
723 Returns: One of the END_xxx values indicating why it stopped reading
724 */
725
726 static int
727 read_message_data_smtp(FILE *fout)
728 {
729 int ch_state = 0;
730 register int ch;
731
732 while ((ch = (RECEIVE_GETC)()) != EOF)
733 {
734 if (ch == 0) body_zerocount++;
735 switch (ch_state)
736 {
737 case 0: /* After LF or CRLF */
738 if (ch == '.')
739 {
740 ch_state = 3;
741 continue; /* Don't ever write . after LF */
742 }
743 ch_state = 1;
744
745 /* Else fall through to handle as normal uschar. */
746
747 case 1: /* Normal state */
748 if (ch == '\n')
749 {
750 ch_state = 0;
751 body_linecount++;
752 }
753 else if (ch == '\r')
754 {
755 ch_state = 2;
756 continue;
757 }
758 break;
759
760 case 2: /* After (unwritten) CR */
761 body_linecount++;
762 if (ch == '\n')
763 {
764 ch_state = 0;
765 }
766 else
767 {
768 message_size++;
769 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
770 if (ch != '\r') ch_state = 1; else continue;
771 }
772 break;
773
774 case 3: /* After [CR] LF . */
775 if (ch == '\n')
776 return END_DOT;
777 if (ch == '\r')
778 {
779 ch_state = 4;
780 continue;
781 }
782 ch_state = 1; /* The dot itself is removed */
783 break;
784
785 case 4: /* After [CR] LF . CR */
786 if (ch == '\n') return END_DOT;
787 message_size++;
788 body_linecount++;
789 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
790 if (ch == '\r')
791 {
792 ch_state = 2;
793 continue;
794 }
795 ch_state = 1;
796 break;
797 }
798
799 /* Add the character to the spool file, unless skipping; then loop for the
800 next. */
801
802 message_size++;
803 if (fout != NULL)
804 {
805 if (fputc(ch, fout) == EOF) return END_WERROR;
806 if (message_size > thismessage_size_limit) return END_SIZE;
807 }
808 }
809
810 /* Fall through here if EOF encountered. This indicates some kind of error,
811 since a correct message is terminated by [CR] LF . [CR] LF. */
812
813 return END_EOF;
814 }
815
816
817
818
819 /*************************************************
820 * Swallow SMTP message *
821 *************************************************/
822
823 /* This function is called when there has been some kind of error while reading
824 an SMTP message, and the remaining data may need to be swallowed. It is global
825 because it is called from smtp_closedown() to shut down an incoming call
826 tidily.
827
828 Argument: a FILE from which to read the message
829 Returns: nothing
830 */
831
832 void
833 receive_swallow_smtp(void)
834 {
835 if (message_ended >= END_NOTENDED)
836 message_ended = read_message_data_smtp(NULL);
837 }
838
839
840
841 /*************************************************
842 * Handle lost SMTP connection *
843 *************************************************/
844
845 /* This function logs connection loss incidents and generates an appropriate
846 SMTP response.
847
848 Argument: additional data for the message
849 Returns: the SMTP response
850 */
851
852 static uschar *
853 handle_lost_connection(uschar *s)
854 {
855 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
856 "%s lost while reading message data%s", smtp_get_connection_info(), s);
857 return US"421 Lost incoming connection";
858 }
859
860
861
862
863 /*************************************************
864 * Handle a non-smtp reception error *
865 *************************************************/
866
867 /* This function is called for various errors during the reception of non-SMTP
868 messages. It either sends a message to the sender of the problem message, or it
869 writes to the standard error stream.
870
871 Arguments:
872 errcode code for moan_to_sender(), identifying the error
873 text1 first message text, passed to moan_to_sender()
874 text2 second message text, used only for stderrr
875 error_rc code to pass to exim_exit if no problem
876 f FILE containing body of message (may be stdin)
877 hptr pointer to instore headers or NULL
878
879 Returns: calls exim_exit(), which does not return
880 */
881
882 static void
883 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
884 FILE *f, header_line *hptr)
885 {
886 if (error_handling == ERRORS_SENDER)
887 {
888 error_block eblock;
889 eblock.next = NULL;
890 eblock.text1 = text1;
891 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
892 error_rc = EXIT_FAILURE;
893 }
894 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
895 (void)fclose(f);
896 exim_exit(error_rc);
897 }
898
899
900
901 /*************************************************
902 * Add header lines set up by ACL *
903 *************************************************/
904
905 /* This function is called to add the header lines that were set up by
906 statements in an ACL to the list of headers in memory. It is done in two stages
907 like this, because when the ACL for RCPT is running, the other headers have not
908 yet been received. This function is called twice; once just before running the
909 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
910 are visible to the DATA ACL.
911
912 Originally these header lines were added at the end. Now there is support for
913 three different places: top, bottom, and after the Received: header(s). There
914 will always be at least one Received: header, even if it is marked deleted, and
915 even if something else has been put in front of it.
916
917 Arguments:
918 acl_name text to identify which ACL
919
920 Returns: nothing
921 */
922
923 static void
924 add_acl_headers(uschar *acl_name)
925 {
926 header_line *h, *next;
927 header_line *last_received = NULL;
928
929 if (acl_added_headers == NULL) return;
930 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
931
932 for (h = acl_added_headers; h != NULL; h = next)
933 {
934 next = h->next;
935
936 switch(h->type)
937 {
938 case htype_add_top:
939 h->next = header_list;
940 header_list = h;
941 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
942 break;
943
944 case htype_add_rec:
945 if (last_received == NULL)
946 {
947 last_received = header_list;
948 while (!header_testname(last_received, US"Received", 8, FALSE))
949 last_received = last_received->next;
950 while (last_received->next != NULL &&
951 header_testname(last_received->next, US"Received", 8, FALSE))
952 last_received = last_received->next;
953 }
954 h->next = last_received->next;
955 last_received->next = h;
956 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
957 break;
958
959 case htype_add_rfc:
960 /* add header before any header which is NOT Received: or Resent- */
961 last_received = header_list;
962 while ( (last_received->next != NULL) &&
963 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
964 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
965 last_received = last_received->next;
966 /* last_received now points to the last Received: or Resent-* header
967 in an uninterrupted chain of those header types (seen from the beginning
968 of all headers. Our current header must follow it. */
969 h->next = last_received->next;
970 last_received->next = h;
971 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
972 break;
973
974 default:
975 h->next = NULL;
976 header_last->next = h;
977 break;
978 }
979
980 if (h->next == NULL) header_last = h;
981
982 /* Check for one of the known header types (From:, To:, etc.) though in
983 practice most added headers are going to be "other". Lower case
984 identification letters are never stored with the header; they are used
985 for existence tests when messages are received. So discard any lower case
986 flag values. */
987
988 h->type = header_checkname(h, FALSE);
989 if (h->type >= 'a') h->type = htype_other;
990
991 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
992 }
993
994 acl_added_headers = NULL;
995 DEBUG(D_receive|D_acl) debug_printf(">>\n");
996 }
997
998
999
1000 /*************************************************
1001 * Add host information for log line *
1002 *************************************************/
1003
1004 /* Called for acceptance and rejecting log lines. This adds information about
1005 the calling host to a string that is being built dynamically.
1006
1007 Arguments:
1008 s the dynamic string
1009 sizeptr points to the size variable
1010 ptrptr points to the pointer variable
1011
1012 Returns: the extended string
1013 */
1014
1015 static uschar *
1016 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1017 {
1018 if (sender_fullhost != NULL)
1019 {
1020 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1021 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1022 interface_address != NULL)
1023 {
1024 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1025 interface_port);
1026 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1027 }
1028 }
1029 if (sender_ident != NULL)
1030 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1031 if (received_protocol != NULL)
1032 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1033 return s;
1034 }
1035
1036
1037
1038 #ifdef WITH_CONTENT_SCAN
1039
1040 /*************************************************
1041 * Run the MIME ACL on a message *
1042 *************************************************/
1043
1044 /* This code is in a subroutine so that it can be used for both SMTP
1045 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1046
1047 Arguments:
1048 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1049 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1050 smtp_reply_ptr Where SMTP reply is being built
1051 blackholed_by_ptr Where "blackholed by" message is being built
1052
1053 Returns: TRUE to carry on; FALSE to abandon the message
1054 */
1055
1056 static BOOL
1057 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1058 uschar **blackholed_by_ptr)
1059 {
1060 FILE *mbox_file;
1061 uschar rfc822_file_path[2048];
1062 unsigned long mbox_size;
1063 header_line *my_headerlist;
1064 uschar *user_msg, *log_msg;
1065 int mime_part_count_buffer = -1;
1066 int rc;
1067
1068 memset(CS rfc822_file_path,0,2048);
1069
1070 /* check if it is a MIME message */
1071 my_headerlist = header_list;
1072 while (my_headerlist != NULL)
1073 {
1074 /* skip deleted headers */
1075 if (my_headerlist->type == '*')
1076 {
1077 my_headerlist = my_headerlist->next;
1078 continue;
1079 }
1080 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1081 {
1082 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1083 goto DO_MIME_ACL;
1084 }
1085 my_headerlist = my_headerlist->next;
1086 }
1087
1088 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1089 return TRUE;
1090
1091 DO_MIME_ACL:
1092 /* make sure the eml mbox file is spooled up */
1093 mbox_file = spool_mbox(&mbox_size);
1094 if (mbox_file == NULL) {
1095 /* error while spooling */
1096 log_write(0, LOG_MAIN|LOG_PANIC,
1097 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1098 Uunlink(spool_name);
1099 unspool_mbox();
1100 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1101 message_id[0] = 0; /* Indicate no message accepted */
1102 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1103 return FALSE; /* Indicate skip to end of receive function */
1104 };
1105
1106 mime_is_rfc822 = 0;
1107
1108 MIME_ACL_CHECK:
1109 mime_part_count = -1;
1110 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1111 (void)fclose(mbox_file);
1112
1113 if (Ustrlen(rfc822_file_path) > 0)
1114 {
1115 mime_part_count = mime_part_count_buffer;
1116
1117 if (unlink(CS rfc822_file_path) == -1)
1118 {
1119 log_write(0, LOG_PANIC,
1120 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1121 goto END_MIME_ACL;
1122 }
1123 }
1124
1125 /* check if we must check any message/rfc822 attachments */
1126 if (rc == OK)
1127 {
1128 uschar temp_path[1024];
1129 int n;
1130 struct dirent *entry;
1131 DIR *tempdir;
1132
1133 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1134 message_id);
1135
1136 tempdir = opendir(CS temp_path);
1137 n = 0;
1138 do
1139 {
1140 entry = readdir(tempdir);
1141 if (entry == NULL) break;
1142 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1143 {
1144 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1145 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1146 break;
1147 }
1148 } while (1);
1149 closedir(tempdir);
1150
1151 if (entry != NULL)
1152 {
1153 mbox_file = Ufopen(rfc822_file_path,"rb");
1154 if (mbox_file == NULL)
1155 {
1156 log_write(0, LOG_PANIC,
1157 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1158 unlink(CS rfc822_file_path);
1159 goto END_MIME_ACL;
1160 }
1161 /* set RFC822 expansion variable */
1162 mime_is_rfc822 = 1;
1163 mime_part_count_buffer = mime_part_count;
1164 goto MIME_ACL_CHECK;
1165 }
1166 }
1167
1168 END_MIME_ACL:
1169 add_acl_headers(US"MIME");
1170 if (rc == DISCARD)
1171 {
1172 recipients_count = 0;
1173 *blackholed_by_ptr = US"MIME ACL";
1174 }
1175 else if (rc != OK)
1176 {
1177 Uunlink(spool_name);
1178 unspool_mbox();
1179 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1180 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1181 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1182 message_id[0] = 0; /* Indicate no message accepted */
1183 return FALSE; /* Cause skip to end of receive function */
1184 }
1185
1186 return TRUE;
1187 }
1188
1189 #endif /* WITH_CONTENT_SCAN */
1190
1191
1192 /*************************************************
1193 * Receive message *
1194 *************************************************/
1195
1196 /* Receive a message on the given input, and put it into a pair of spool files.
1197 Either a non-null list of recipients, or the extract flag will be true, or
1198 both. The flag sender_local is true for locally generated messages. The flag
1199 submission_mode is true if an ACL has obeyed "control = submission". The flag
1200 suppress_local_fixups is true if an ACL has obeyed "control =
1201 suppress_local_fixups". The flag smtp_input is true if the message is to be
1202 handled using SMTP conventions about termination and lines starting with dots.
1203 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1204
1205 If a message was successfully read, message_id[0] will be non-zero.
1206
1207 The general actions of this function are:
1208
1209 . Read the headers of the message (if any) into a chain of store
1210 blocks.
1211
1212 . If there is a "sender:" header and the message is locally originated,
1213 throw it away, unless the caller is trusted, or unless
1214 active_local_sender_retain is set - which can only happen if
1215 active_local_from_check is false.
1216
1217 . If recipients are to be extracted from the message, build the
1218 recipients list from the headers, removing any that were on the
1219 original recipients list (unless extract_addresses_remove_arguments is
1220 false), and at the same time, remove any bcc header that may be present.
1221
1222 . Get the spool file for the data, sort out its unique name, open
1223 and lock it (but don't give it the name yet).
1224
1225 . Generate a "Message-Id" header if the message doesn't have one, for
1226 locally-originated messages.
1227
1228 . Generate a "Received" header.
1229
1230 . Ensure the recipients list is fully qualified and rewritten if necessary.
1231
1232 . If there are any rewriting rules, apply them to the sender address
1233 and also to the headers.
1234
1235 . If there is no from: header, generate one, for locally-generated messages
1236 and messages in "submission mode" only.
1237
1238 . If the sender is local, check that from: is correct, and if not, generate
1239 a Sender: header, unless message comes from a trusted caller, or this
1240 feature is disabled by active_local_from_check being false.
1241
1242 . If there is no "date" header, generate one, for locally-originated
1243 or submission mode messages only.
1244
1245 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1246 dot_ends mode, to the data file. Leave it open, to hold the lock.
1247
1248 . Write the envelope and the headers to a new file.
1249
1250 . Set the name for the header file; close it.
1251
1252 . Set the name for the data file; close it.
1253
1254 Because this function can potentially be called many times in a single
1255 SMTP connection, all store should be got by store_get(), so that it will be
1256 automatically retrieved after the message is accepted.
1257
1258 FUDGE: It seems that sites on the net send out messages with just LF
1259 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1260 we make the CRs optional in all cases.
1261
1262 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1263 new regime is now in place in which bare CRs in header lines are turned into LF
1264 followed by a space, so as not to terminate the header line.
1265
1266 February 2004: A bare LF in a header line in a message whose first line was
1267 terminated by CRLF is treated in the same way as a bare CR.
1268
1269 Arguments:
1270 extract_recip TRUE if recipients are to be extracted from the message's
1271 headers
1272
1273 Returns: TRUE there are more messages to be read (SMTP input)
1274 FALSE there are no more messages to be read (non-SMTP input
1275 or SMTP connection collapsed, or other failure)
1276
1277 When reading a message for filter testing, the returned value indicates
1278 whether the headers (which is all that is read) were terminated by '.' or
1279 not. */
1280
1281 BOOL
1282 receive_msg(BOOL extract_recip)
1283 {
1284 int i, rc;
1285 int msg_size = 0;
1286 int process_info_len = Ustrlen(process_info);
1287 int error_rc = (error_handling == ERRORS_SENDER)?
1288 errors_sender_rc : EXIT_FAILURE;
1289 int header_size = 256;
1290 int start, end, domain, size, sptr;
1291 int id_resolution;
1292 int had_zero = 0;
1293 int prevlines_length = 0;
1294
1295 register int ptr = 0;
1296
1297 BOOL contains_resent_headers = FALSE;
1298 BOOL extracted_ignored = FALSE;
1299 BOOL first_line_ended_crlf = TRUE_UNSET;
1300 BOOL smtp_yield = TRUE;
1301 BOOL yield = FALSE;
1302
1303 BOOL resents_exist = FALSE;
1304 uschar *resent_prefix = US"";
1305 uschar *blackholed_by = NULL;
1306 uschar *blackhole_log_msg = US"";
1307
1308 flock_t lock_data;
1309 error_block *bad_addresses = NULL;
1310
1311 uschar *frozen_by = NULL;
1312 uschar *queued_by = NULL;
1313
1314 uschar *errmsg, *s;
1315 struct stat statbuf;
1316
1317 /* Final message to give to SMTP caller, and messages from ACLs */
1318
1319 uschar *smtp_reply = NULL;
1320 uschar *user_msg, *log_msg;
1321
1322 /* Working header pointers */
1323
1324 header_line *h, *next;
1325
1326 /* Flags for noting the existence of certain headers (only one left) */
1327
1328 BOOL date_header_exists = FALSE;
1329
1330 /* Pointers to receive the addresses of headers whose contents we need. */
1331
1332 header_line *from_header = NULL;
1333 header_line *subject_header = NULL;
1334 header_line *msgid_header = NULL;
1335 header_line *received_header;
1336
1337 /* Variables for use when building the Received: header. */
1338
1339 uschar *received;
1340 uschar *timestamp;
1341 int tslen;
1342
1343 /* Release any open files that might have been cached while preparing to
1344 accept the message - e.g. by verifying addresses - because reading a message
1345 might take a fair bit of real time. */
1346
1347 search_tidyup();
1348
1349 /* Initialize the chain of headers by setting up a place-holder for Received:
1350 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1351 pointing to the end of the chain to make adding headers simple. */
1352
1353 received_header = header_list = header_last = store_get(sizeof(header_line));
1354 header_list->next = NULL;
1355 header_list->type = htype_old;
1356 header_list->text = NULL;
1357 header_list->slen = 0;
1358
1359 /* Control block for the next header to be read. */
1360
1361 next = store_get(sizeof(header_line));
1362 next->text = store_get(header_size);
1363
1364 /* Initialize message id to be null (indicating no message read), and the
1365 header names list to be the normal list. Indicate there is no data file open
1366 yet, initialize the size and warning count, and deal with no size limit. */
1367
1368 message_id[0] = 0;
1369 data_file = NULL;
1370 data_fd = -1;
1371 spool_name[0] = 0;
1372 message_size = 0;
1373 warning_count = 0;
1374 received_count = 1; /* For the one we will add */
1375
1376 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1377
1378 /* While reading the message, the following counts are computed. */
1379
1380 message_linecount = body_linecount = body_zerocount =
1381 max_received_linelength = 0;
1382
1383 #ifdef EXPERIMENTAL_DOMAINKEYS
1384 /* Call into DK to set up the context. Check if DK is to be run are carried out
1385 inside dk_exim_verify_init(). */
1386 dk_exim_verify_init();
1387 #endif
1388
1389 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1390 ids, and fractions of a second are required. See the comments that precede the
1391 message id creation below. */
1392
1393 (void)gettimeofday(&message_id_tv, NULL);
1394
1395 /* For other uses of the received time we can operate with granularity of one
1396 second, and for that we use the global variable received_time. This is for
1397 things like ultimate message timeouts. */
1398
1399 received_time = message_id_tv.tv_sec;
1400
1401 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1402 happen in the smtp_getc() function when it refills its buffer. */
1403
1404 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1405
1406 /* If not SMTP input, timeout happens only if configured, and we just set a
1407 single timeout for the whole message. */
1408
1409 else if (receive_timeout > 0)
1410 {
1411 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1412 alarm(receive_timeout);
1413 }
1414
1415 /* SIGTERM and SIGINT are caught always. */
1416
1417 signal(SIGTERM, data_sigterm_sigint_handler);
1418 signal(SIGINT, data_sigterm_sigint_handler);
1419
1420 /* Header lines in messages are not supposed to be very long, though when
1421 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1422 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1423 storing the header, and extend this as necessary using string_cat().
1424
1425 To cope with total lunacies, impose an upper limit on the length of the header
1426 section of the message, as otherwise the store will fill up. We must also cope
1427 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1428 Folded header lines are joined into one string, leaving the '\n' characters
1429 inside them, so that writing them out reproduces the input.
1430
1431 Loop for each character of each header; the next structure for chaining the
1432 header is set up already, with ptr the offset of the next character in
1433 next->text. */
1434
1435 for (;;)
1436 {
1437 int ch = (RECEIVE_GETC)();
1438
1439 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1440 SMTP must have a correct "." terminator. */
1441
1442 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1443 {
1444 smtp_reply = handle_lost_connection(US" (header)");
1445 smtp_yield = FALSE;
1446 goto TIDYUP; /* Skip to end of function */
1447 }
1448
1449 /* See if we are at the current header's size limit - there must be at least
1450 four bytes left. This allows for the new character plus a zero, plus two for
1451 extra insertions when we are playing games with dots and carriage returns. If
1452 we are at the limit, extend the text buffer. This could have been done
1453 automatically using string_cat() but because this is a tightish loop storing
1454 only one character at a time, we choose to do it inline. Normally
1455 store_extend() will be able to extend the block; only at the end of a big
1456 store block will a copy be needed. To handle the case of very long headers
1457 (and sometimes lunatic messages can have ones that are 100s of K long) we
1458 call store_release() for strings that have been copied - if the string is at
1459 the start of a block (and therefore the only thing in it, because we aren't
1460 doing any other gets), the block gets freed. We can only do this because we
1461 know there are no other calls to store_get() going on. */
1462
1463 if (ptr >= header_size - 4)
1464 {
1465 int oldsize = header_size;
1466 /* header_size += 256; */
1467 header_size *= 2;
1468 if (!store_extend(next->text, oldsize, header_size))
1469 {
1470 uschar *newtext = store_get(header_size);
1471 memcpy(newtext, next->text, ptr);
1472 store_release(next->text);
1473 next->text = newtext;
1474 }
1475 }
1476
1477 /* Cope with receiving a binary zero. There is dispute about whether
1478 these should be allowed in RFC 822 messages. The middle view is that they
1479 should not be allowed in headers, at least. Exim takes this attitude at
1480 the moment. We can't just stomp on them here, because we don't know that
1481 this line is a header yet. Set a flag to cause scanning later. */
1482
1483 if (ch == 0) had_zero++;
1484
1485 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1486 those from data files use just LF. Treat LF in local SMTP input as a
1487 terminator too. Treat EOF as a line terminator always. */
1488
1489 if (ch == EOF) goto EOL;
1490
1491 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1492 other MTAs accept this. We are therefore forced into this "liberalisation"
1493 too, so we accept LF as a line terminator whatever the source of the message.
1494 However, if the first line of the message ended with a CRLF, we treat a bare
1495 LF specially by inserting a white space after it to ensure that the header
1496 line is not terminated. */
1497
1498 if (ch == '\n')
1499 {
1500 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1501 else if (first_line_ended_crlf) RECEIVE_UNGETC(' ');
1502 goto EOL;
1503 }
1504
1505 /* This is not the end of the line. If this is SMTP input and this is
1506 the first character in the line and it is a "." character, ignore it.
1507 This implements the dot-doubling rule, though header lines starting with
1508 dots aren't exactly common. They are legal in RFC 822, though. If the
1509 following is CRLF or LF, this is the line that that terminates the
1510 entire message. We set message_ended to indicate this has happened (to
1511 prevent further reading), and break out of the loop, having freed the
1512 empty header, and set next = NULL to indicate no data line. */
1513
1514 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1515 {
1516 ch = (RECEIVE_GETC)();
1517 if (ch == '\r')
1518 {
1519 ch = (RECEIVE_GETC)();
1520 if (ch != '\n')
1521 {
1522 RECEIVE_UNGETC(ch);
1523 ch = '\r'; /* Revert to CR */
1524 }
1525 }
1526 if (ch == '\n')
1527 {
1528 message_ended = END_DOT;
1529 store_reset(next);
1530 next = NULL;
1531 break; /* End character-reading loop */
1532 }
1533
1534 /* For non-SMTP input, the dot at the start of the line was really a data
1535 character. What is now in ch is the following character. We guaranteed
1536 enough space for this above. */
1537
1538 if (!smtp_input)
1539 {
1540 next->text[ptr++] = '.';
1541 message_size++;
1542 }
1543 }
1544
1545 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1546 remember this case if this is the first line ending. */
1547
1548 if (ch == '\r')
1549 {
1550 ch = (RECEIVE_GETC)();
1551 if (ch == '\n')
1552 {
1553 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1554 goto EOL;
1555 }
1556
1557 /* Otherwise, put back the character after CR, and turn the bare CR
1558 into LF SP. */
1559
1560 ch = (RECEIVE_UNGETC)(ch);
1561 next->text[ptr++] = '\n';
1562 message_size++;
1563 ch = ' ';
1564 }
1565
1566 /* We have a data character for the header line. */
1567
1568 next->text[ptr++] = ch; /* Add to buffer */
1569 message_size++; /* Total message size so far */
1570
1571 /* Handle failure due to a humungously long header section. The >= allows
1572 for the terminating \n. Add what we have so far onto the headers list so
1573 that it gets reflected in any error message, and back up the just-read
1574 character. */
1575
1576 if (message_size >= header_maxsize)
1577 {
1578 next->text[ptr] = 0;
1579 next->slen = ptr;
1580 next->type = htype_other;
1581 next->next = NULL;
1582 header_last->next = next;
1583 header_last = next;
1584
1585 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1586 "%s (more than %d characters): message abandoned",
1587 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1588
1589 if (smtp_input)
1590 {
1591 smtp_reply = US"552 Message header is ridiculously long";
1592 receive_swallow_smtp();
1593 goto TIDYUP; /* Skip to end of function */
1594 }
1595
1596 else
1597 {
1598 give_local_error(ERRMESS_VLONGHEADER,
1599 string_sprintf("message header longer than %d characters received: "
1600 "message not accepted", header_maxsize), US"", error_rc, stdin,
1601 header_list->next);
1602 /* Does not return */
1603 }
1604 }
1605
1606 continue; /* With next input character */
1607
1608 /* End of header line reached */
1609
1610 EOL:
1611
1612 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1613
1614 receive_linecount++;
1615 message_linecount++;
1616
1617 /* Keep track of maximum line length */
1618
1619 if (ptr - prevlines_length > max_received_linelength)
1620 max_received_linelength = ptr - prevlines_length;
1621 prevlines_length = ptr + 1;
1622
1623 /* Now put in the terminating newline. There is always space for
1624 at least two more characters. */
1625
1626 next->text[ptr++] = '\n';
1627 message_size++;
1628
1629 /* A blank line signals the end of the headers; release the unwanted
1630 space and set next to NULL to indicate this. */
1631
1632 if (ptr == 1)
1633 {
1634 store_reset(next);
1635 next = NULL;
1636 break;
1637 }
1638
1639 /* There is data in the line; see if the next input character is a
1640 whitespace character. If it is, we have a continuation of this header line.
1641 There is always space for at least one character at this point. */
1642
1643 if (ch != EOF)
1644 {
1645 int nextch = (RECEIVE_GETC)();
1646 if (nextch == ' ' || nextch == '\t')
1647 {
1648 next->text[ptr++] = nextch;
1649 message_size++;
1650 continue; /* Iterate the loop */
1651 }
1652 else if (nextch != EOF) (RECEIVE_UNGETC)(nextch); /* For next time */
1653 else ch = EOF; /* Cause main loop to exit at end */
1654 }
1655
1656 /* We have got to the real line end. Terminate the string and release store
1657 beyond it. If it turns out to be a real header, internal binary zeros will
1658 be squashed later. */
1659
1660 next->text[ptr] = 0;
1661 next->slen = ptr;
1662 store_reset(next->text + ptr + 1);
1663
1664 /* Check the running total size against the overall message size limit. We
1665 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1666 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1667 headers - the code to read the body will then also hit the buffer. */
1668
1669 if (message_size > thismessage_size_limit) break;
1670
1671 /* A line that is not syntactically correct for a header also marks
1672 the end of the headers. In this case, we leave next containing the
1673 first data line. This might actually be several lines because of the
1674 continuation logic applied above, but that doesn't matter.
1675
1676 It turns out that smail, and presumably sendmail, accept leading lines
1677 of the form
1678
1679 From ph10 Fri Jan 5 12:35 GMT 1996
1680
1681 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1682 find any documentation of this, but for compatibility it had better be
1683 accepted. Exim restricts it to the case of non-smtp messages, and
1684 treats it as an alternative to the -f command line option. Thus it is
1685 ignored except for trusted users or filter testing. Otherwise it is taken
1686 as the sender address, unless -f was used (sendmail compatibility).
1687
1688 It further turns out that some UUCPs generate the From_line in a different
1689 format, e.g.
1690
1691 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1692
1693 The regex for matching these things is now capable of recognizing both
1694 formats (including 2- and 4-digit years in the latter). In fact, the regex
1695 is now configurable, as is the expansion string to fish out the sender.
1696
1697 Even further on it has been discovered that some broken clients send
1698 these lines in SMTP messages. There is now an option to ignore them from
1699 specified hosts or networks. Sigh. */
1700
1701 if (header_last == header_list &&
1702 (!smtp_input
1703 ||
1704 (sender_host_address != NULL &&
1705 verify_check_host(&ignore_fromline_hosts) == OK)
1706 ||
1707 (sender_host_address == NULL && ignore_fromline_local)
1708 ) &&
1709 regex_match_and_setup(regex_From, next->text, 0, -1))
1710 {
1711 if (!sender_address_forced)
1712 {
1713 uschar *uucp_sender = expand_string(uucp_from_sender);
1714 if (uucp_sender == NULL)
1715 {
1716 log_write(0, LOG_MAIN|LOG_PANIC,
1717 "expansion of \"%s\" failed after matching "
1718 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1719 }
1720 else
1721 {
1722 int start, end, domain;
1723 uschar *errmess;
1724 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1725 &start, &end, &domain, TRUE);
1726 if (newsender != NULL)
1727 {
1728 if (domain == 0 && newsender[0] != 0)
1729 newsender = rewrite_address_qualify(newsender, FALSE);
1730
1731 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1732 {
1733 sender_address = newsender;
1734
1735 if (trusted_caller || filter_test != FTEST_NONE)
1736 {
1737 authenticated_sender = NULL;
1738 originator_name = US"";
1739 sender_local = FALSE;
1740 }
1741
1742 if (filter_test != FTEST_NONE)
1743 printf("Sender taken from \"From \" line\n");
1744 }
1745 }
1746 }
1747 }
1748 }
1749
1750 /* Not a leading "From " line. Check to see if it is a valid header line.
1751 Header names may contain any non-control characters except space and colon,
1752 amazingly. */
1753
1754 else
1755 {
1756 uschar *p = next->text;
1757
1758 /* If not a valid header line, break from the header reading loop, leaving
1759 next != NULL, indicating that it holds the first line of the body. */
1760
1761 if (isspace(*p)) break;
1762 while (mac_isgraph(*p) && *p != ':') p++;
1763 while (isspace(*p)) p++;
1764 if (*p != ':')
1765 {
1766 body_zerocount = had_zero;
1767 break;
1768 }
1769
1770 /* We have a valid header line. If there were any binary zeroes in
1771 the line, stomp on them here. */
1772
1773 if (had_zero > 0)
1774 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1775
1776 /* It is perfectly legal to have an empty continuation line
1777 at the end of a header, but it is confusing to humans
1778 looking at such messages, since it looks like a blank line.
1779 Reduce confusion by removing redundant white space at the
1780 end. We know that there is at least one printing character
1781 (the ':' tested for above) so there is no danger of running
1782 off the end. */
1783
1784 p = next->text + ptr - 2;
1785 for (;;)
1786 {
1787 while (*p == ' ' || *p == '\t') p--;
1788 if (*p != '\n') break;
1789 ptr = (p--) - next->text + 1;
1790 message_size -= next->slen - ptr;
1791 next->text[ptr] = 0;
1792 next->slen = ptr;
1793 }
1794
1795 /* Add the header to the chain */
1796
1797 next->type = htype_other;
1798 next->next = NULL;
1799 header_last->next = next;
1800 header_last = next;
1801
1802 /* Check the limit for individual line lengths. This comes after adding to
1803 the chain so that the failing line is reflected if a bounce is generated
1804 (for a local message). */
1805
1806 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1807 {
1808 log_write(0, LOG_MAIN, "overlong message header line received from "
1809 "%s (more than %d characters): message abandoned",
1810 sender_host_unknown? sender_ident : sender_fullhost,
1811 header_line_maxsize);
1812
1813 if (smtp_input)
1814 {
1815 smtp_reply = US"552 A message header line is too long";
1816 receive_swallow_smtp();
1817 goto TIDYUP; /* Skip to end of function */
1818 }
1819
1820 else
1821 {
1822 give_local_error(ERRMESS_VLONGHDRLINE,
1823 string_sprintf("message header line longer than %d characters "
1824 "received: message not accepted", header_line_maxsize), US"",
1825 error_rc, stdin, header_list->next);
1826 /* Does not return */
1827 }
1828 }
1829
1830 /* Note if any resent- fields exist. */
1831
1832 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1833 {
1834 resents_exist = TRUE;
1835 resent_prefix = US"Resent-";
1836 }
1837 }
1838
1839 /* The line has been handled. If we have hit EOF, break out of the loop,
1840 indicating no pending data line. */
1841
1842 if (ch == EOF) { next = NULL; break; }
1843
1844 /* Set up for the next header */
1845
1846 header_size = 256;
1847 next = store_get(sizeof(header_line));
1848 next->text = store_get(header_size);
1849 ptr = 0;
1850 had_zero = 0;
1851 prevlines_length = 0;
1852 } /* Continue, starting to read the next header */
1853
1854 /* At this point, we have read all the headers into a data structure in main
1855 store. The first header is still the dummy placeholder for the Received: header
1856 we are going to generate a bit later on. If next != NULL, it contains the first
1857 data line - which terminated the headers before reaching a blank line (not the
1858 normal case). */
1859
1860 DEBUG(D_receive)
1861 {
1862 debug_printf(">>Headers received:\n");
1863 for (h = header_list->next; h != NULL; h = h->next)
1864 debug_printf("%s", h->text);
1865 debug_printf("\n");
1866 }
1867
1868 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1869 is dropped immediately after valid headers, the next thing we will see is EOF.
1870 We must test for this specially, as further down the reading of the data is
1871 skipped if already at EOF. */
1872
1873 if (smtp_input && (receive_feof)())
1874 {
1875 smtp_reply = handle_lost_connection(US" (after header)");
1876 smtp_yield = FALSE;
1877 goto TIDYUP; /* Skip to end of function */
1878 }
1879
1880 /* If this is a filter test run and no headers were read, output a warning
1881 in case there is a mistake in the test message. */
1882
1883 if (filter_test != FTEST_NONE && header_list->next == NULL)
1884 printf("Warning: no message headers read\n");
1885
1886
1887 /* Scan the headers to identify them. Some are merely marked for later
1888 processing; some are dealt with here. */
1889
1890 for (h = header_list->next; h != NULL; h = h->next)
1891 {
1892 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1893 if (is_resent) contains_resent_headers = TRUE;
1894
1895 switch (header_checkname(h, is_resent))
1896 {
1897 case htype_bcc:
1898 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
1899 break;
1900
1901 case htype_cc:
1902 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
1903 break;
1904
1905 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1906
1907 case htype_date:
1908 date_header_exists = !resents_exist || is_resent;
1909 break;
1910
1911 /* Same comments as about Return-Path: below. */
1912
1913 case htype_delivery_date:
1914 if (delivery_date_remove) h->type = htype_old;
1915 break;
1916
1917 /* Same comments as about Return-Path: below. */
1918
1919 case htype_envelope_to:
1920 if (envelope_to_remove) h->type = htype_old;
1921 break;
1922
1923 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1924 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1925 header consists of just the login id of the user who called Exim, rewrite
1926 it with the gecos field first. Apply this rule to Resent-From: if there
1927 are resent- fields. */
1928
1929 case htype_from:
1930 h->type = htype_from;
1931 if (!resents_exist || is_resent)
1932 {
1933 from_header = h;
1934 if (!smtp_input)
1935 {
1936 uschar *s = Ustrchr(h->text, ':') + 1;
1937 while (isspace(*s)) s++;
1938 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1939 {
1940 uschar *name = is_resent? US"Resent-From" : US"From";
1941 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1942 originator_login, qualify_domain_sender);
1943 from_header = header_last;
1944 h->type = htype_old;
1945 DEBUG(D_receive|D_rewrite)
1946 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1947 }
1948 }
1949 }
1950 break;
1951
1952 /* Identify the Message-id: header for generating "in-reply-to" in the
1953 autoreply transport. For incoming logging, save any resent- value. In both
1954 cases, take just the first of any multiples. */
1955
1956 case htype_id:
1957 if (msgid_header == NULL && (!resents_exist || is_resent))
1958 {
1959 msgid_header = h;
1960 h->type = htype_id;
1961 }
1962 break;
1963
1964 /* Flag all Received: headers */
1965
1966 case htype_received:
1967 h->type = htype_received;
1968 received_count++;
1969 break;
1970
1971 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1972
1973 case htype_reply_to:
1974 h->type = htype_reply_to;
1975 break;
1976
1977 /* The Return-path: header is supposed to be added to messages when
1978 they leave the SMTP system. We shouldn't receive messages that already
1979 contain Return-path. However, since Exim generates Return-path: on
1980 local delivery, resent messages may well contain it. We therefore
1981 provide an option (which defaults on) to remove any Return-path: headers
1982 on input. Removal actually means flagging as "old", which prevents the
1983 header being transmitted with the message. */
1984
1985 case htype_return_path:
1986 if (return_path_remove) h->type = htype_old;
1987
1988 /* If we are testing a mail filter file, use the value of the
1989 Return-Path: header to set up the return_path variable, which is not
1990 otherwise set. However, remove any <> that surround the address
1991 because the variable doesn't have these. */
1992
1993 if (filter_test != FTEST_NONE)
1994 {
1995 uschar *start = h->text + 12;
1996 uschar *end = start + Ustrlen(start);
1997 while (isspace(*start)) start++;
1998 while (end > start && isspace(end[-1])) end--;
1999 if (*start == '<' && end[-1] == '>')
2000 {
2001 start++;
2002 end--;
2003 }
2004 return_path = string_copyn(start, end - start);
2005 printf("Return-path taken from \"Return-path:\" header line\n");
2006 }
2007 break;
2008
2009 /* If there is a "Sender:" header and the message is locally originated,
2010 and from an untrusted caller and suppress_local_fixups is not set, or if we
2011 are in submission mode for a remote message, mark it "old" so that it will
2012 not be transmitted with the message, unless active_local_sender_retain is
2013 set. (This can only be true if active_local_from_check is false.) If there
2014 are any resent- headers in the message, apply this rule to Resent-Sender:
2015 instead of Sender:. Messages with multiple resent- header sets cannot be
2016 tidily handled. (For this reason, at least one MUA - Pine - turns old
2017 resent- headers into X-resent- headers when resending, leaving just one
2018 set.) */
2019
2020 case htype_sender:
2021 h->type = ((!active_local_sender_retain &&
2022 (
2023 (sender_local && !trusted_caller && !suppress_local_fixups)
2024 || submission_mode
2025 )
2026 ) &&
2027 (!resents_exist||is_resent))?
2028 htype_old : htype_sender;
2029 break;
2030
2031 /* Remember the Subject: header for logging. There is no Resent-Subject */
2032
2033 case htype_subject:
2034 subject_header = h;
2035 break;
2036
2037 /* "To:" gets flagged, and the existence of a recipient header is noted,
2038 whether it's resent- or not. */
2039
2040 case htype_to:
2041 h->type = htype_to;
2042 /****
2043 to_or_cc_header_exists = TRUE;
2044 ****/
2045 break;
2046 }
2047 }
2048
2049 /* Extract recipients from the headers if that is required (the -t option).
2050 Note that this is documented as being done *before* any address rewriting takes
2051 place. There are two possibilities:
2052
2053 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2054 recipients already listed are to be REMOVED from the message. Smail 3 works
2055 like this. We need to build a non-recipients tree for that list, because in
2056 subsequent processing this data is held in a tree and that's what the
2057 spool_write_header() function expects. Make sure that non-recipient addresses
2058 are fully qualified and rewritten if necessary.
2059
2060 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2061 those in the command line arguments (and it is rumoured some other MTAs do
2062 this). Therefore, there is an option to make Exim behave this way.
2063
2064 *** Notes on "Resent-" header lines ***
2065
2066 The presence of resent-headers in the message makes -t horribly ambiguous.
2067 Experiments with sendmail showed that it uses recipients for all resent-
2068 headers, totally ignoring the concept of "sets of resent- headers" as described
2069 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2070 with all the addresses in one instance of each header.
2071
2072 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2073 error for -t if there were resent- headers in the message. However, after a
2074 discussion on the mailing list, I've learned that there are MUAs that use
2075 resent- headers with -t, and also that the stuff about sets of resent- headers
2076 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2077 message with -t and resent- header lines makes sure that only *its* resent-
2078 headers are present; previous ones are often renamed as X-resent- for example.
2079
2080 Consequently, Exim has been changed so that, if any resent- header lines are
2081 present, the recipients are taken from all of the appropriate resent- lines,
2082 and not from the ordinary To:, Cc:, etc. */
2083
2084 if (extract_recip)
2085 {
2086 int rcount = 0;
2087 error_block **bnext = &bad_addresses;
2088
2089 if (extract_addresses_remove_arguments)
2090 {
2091 while (recipients_count-- > 0)
2092 {
2093 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2094 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2095 tree_add_nonrecipient(s);
2096 }
2097 recipients_list = NULL;
2098 recipients_count = recipients_list_max = 0;
2099 }
2100
2101 /* Now scan the headers */
2102
2103 for (h = header_list->next; h != NULL; h = h->next)
2104 {
2105 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2106 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2107 {
2108 uschar *s = Ustrchr(h->text, ':') + 1;
2109 while (isspace(*s)) s++;
2110
2111 parse_allow_group = TRUE; /* Allow address group syntax */
2112
2113 while (*s != 0)
2114 {
2115 uschar *ss = parse_find_address_end(s, FALSE);
2116 uschar *recipient, *errmess, *p, *pp;
2117 int start, end, domain;
2118
2119 /* Check on maximum */
2120
2121 if (recipients_max > 0 && ++rcount > recipients_max)
2122 {
2123 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2124 US"message rejected: ", error_rc, stdin, NULL);
2125 /* Does not return */
2126 }
2127
2128 /* Make a copy of the address, and remove any internal newlines. These
2129 may be present as a result of continuations of the header line. The
2130 white space that follows the newline must not be removed - it is part
2131 of the header. */
2132
2133 pp = recipient = store_get(ss - s + 1);
2134 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2135 *pp = 0;
2136 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2137 &domain, FALSE);
2138
2139 /* Keep a list of all the bad addresses so we can send a single
2140 error message at the end. However, an empty address is not an error;
2141 just ignore it. This can come from an empty group list like
2142
2143 To: Recipients of list:;
2144
2145 If there are no recipients at all, an error will occur later. */
2146
2147 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2148 {
2149 int len = Ustrlen(s);
2150 error_block *b = store_get(sizeof(error_block));
2151 while (len > 0 && isspace(s[len-1])) len--;
2152 b->next = NULL;
2153 b->text1 = string_printing(string_copyn(s, len));
2154 b->text2 = errmess;
2155 *bnext = b;
2156 bnext = &(b->next);
2157 }
2158
2159 /* If the recipient is already in the nonrecipients tree, it must
2160 have appeared on the command line with the option extract_addresses_
2161 remove_arguments set. Do not add it to the recipients, and keep a note
2162 that this has happened, in order to give a better error if there are
2163 no recipients left. */
2164
2165 else if (recipient != NULL)
2166 {
2167 if (tree_search(tree_nonrecipients, recipient) == NULL)
2168 receive_add_recipient(recipient, -1);
2169 else
2170 extracted_ignored = TRUE;
2171 }
2172
2173 /* Move on past this address */
2174
2175 s = ss + (*ss? 1:0);
2176 while (isspace(*s)) s++;
2177 } /* Next address */
2178
2179 parse_allow_group = FALSE; /* Reset group syntax flags */
2180 parse_found_group = FALSE;
2181
2182 /* If this was the bcc: header, mark it "old", which means it
2183 will be kept on the spool, but not transmitted as part of the
2184 message. */
2185
2186 if (h->type == htype_bcc) h->type = htype_old;
2187 } /* For appropriate header line */
2188 } /* For each header line */
2189
2190 }
2191
2192 /* Now build the unique message id. This has changed several times over the
2193 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2194 Retaining all the history in the comment has become too unwieldy - read
2195 previous release sources if you want it.
2196
2197 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2198 The first part is the current time, in seconds. The second part is the current
2199 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2200 can hold a number in the range 0-3843. It used to be a computed sequence
2201 number, but is now the fractional component of the current time in units of
2202 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2203 received, Exim ensures that the timer has ticked at the appropriate level
2204 before proceeding, to avoid duplication if the pid happened to be re-used
2205 within the same time period. It seems likely that most messages will take at
2206 least half a millisecond to be received, so no delay will normally be
2207 necessary. At least for some time...
2208
2209 There is a modification when localhost_number is set. Formerly this was allowed
2210 to be as large as 255. Now it is restricted to the range 0-16, and the final
2211 component of the message id becomes (localhost_number * 200) + fractional time
2212 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2213
2214 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2215 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2216 still allows the tttttt field to hold a large enough number to last for some
2217 more decades, and the final two-digit field can hold numbers up to 1295, which
2218 is enough for milliseconds (instead of 1/2000 of a second).
2219
2220 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2221 pid, so it is probably safe because pids have to be positive. The
2222 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2223 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2224
2225 Note that string_base62() returns its data in a static storage block, so it
2226 must be copied before calling string_base62() again. It always returns exactly
2227 6 characters.
2228
2229 There doesn't seem to be anything in the RFC which requires a message id to
2230 start with a letter, but Smail was changed to ensure this. The external form of
2231 the message id (as supplied by string expansion) therefore starts with an
2232 additional leading 'E'. The spool file names do not include this leading
2233 letter and it is not used internally.
2234
2235 NOTE: If ever the format of message ids is changed, the regular expression for
2236 checking that a string is in this format must be updated in a corresponding
2237 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2238 must also be changed to reflect the correct string length. Then, of course,
2239 other programs that rely on the message id format will need updating too. */
2240
2241 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2242 message_id[6] = '-';
2243 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2244
2245 /* Deal with the case where the host number is set. The value of the number was
2246 checked when it was read, to ensure it isn't too big. The timing granularity is
2247 left in id_resolution so that an appropriate wait can be done after receiving
2248 the message, if necessary (we hope it won't be). */
2249
2250 if (host_number_string != NULL)
2251 {
2252 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2253 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2254 string_base62((long int)(
2255 host_number * (1000000/id_resolution) +
2256 message_id_tv.tv_usec/id_resolution)) + 4);
2257 }
2258
2259 /* Host number not set: final field is just the fractional time at an
2260 appropriate resolution. */
2261
2262 else
2263 {
2264 id_resolution = (BASE_62 == 62)? 500 : 1000;
2265 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2266 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2267 }
2268
2269 /* Add the current message id onto the current process info string if
2270 it will fit. */
2271
2272 (void)string_format(process_info + process_info_len,
2273 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2274
2275 /* If we are using multiple input directories, set up the one for this message
2276 to be the least significant base-62 digit of the time of arrival. Otherwise
2277 ensure that it is an empty string. */
2278
2279 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2280
2281 /* Now that we have the message-id, if there is no message-id: header, generate
2282 one, but only for local (without suppress_local_fixups) or submission mode
2283 messages. This can be user-configured if required, but we had better flatten
2284 any illegal characters therein. */
2285
2286 if (msgid_header == NULL &&
2287 ((sender_host_address == NULL && !suppress_local_fixups)
2288 || submission_mode))
2289 {
2290 uschar *p;
2291 uschar *id_text = US"";
2292 uschar *id_domain = primary_hostname;
2293
2294 /* Permit only letters, digits, dots, and hyphens in the domain */
2295
2296 if (message_id_domain != NULL)
2297 {
2298 uschar *new_id_domain = expand_string(message_id_domain);
2299 if (new_id_domain == NULL)
2300 {
2301 if (!expand_string_forcedfail)
2302 log_write(0, LOG_MAIN|LOG_PANIC,
2303 "expansion of \"%s\" (message_id_header_domain) "
2304 "failed: %s", message_id_domain, expand_string_message);
2305 }
2306 else if (*new_id_domain != 0)
2307 {
2308 id_domain = new_id_domain;
2309 for (p = id_domain; *p != 0; p++)
2310 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2311 }
2312 }
2313
2314 /* Permit all characters except controls and RFC 2822 specials in the
2315 additional text part. */
2316
2317 if (message_id_text != NULL)
2318 {
2319 uschar *new_id_text = expand_string(message_id_text);
2320 if (new_id_text == NULL)
2321 {
2322 if (!expand_string_forcedfail)
2323 log_write(0, LOG_MAIN|LOG_PANIC,
2324 "expansion of \"%s\" (message_id_header_text) "
2325 "failed: %s", message_id_text, expand_string_message);
2326 }
2327 else if (*new_id_text != 0)
2328 {
2329 id_text = new_id_text;
2330 for (p = id_text; *p != 0; p++)
2331 if (mac_iscntrl_or_special(*p)) *p = '-';
2332 }
2333 }
2334
2335 /* Add the header line */
2336
2337 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2338 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2339 }
2340
2341 /* If we are to log recipients, keep a copy of the raw ones before any possible
2342 rewriting. Must copy the count, because later ACLs and the local_scan()
2343 function may mess with the real recipients. */
2344
2345 if ((log_extra_selector & LX_received_recipients) != 0)
2346 {
2347 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2348 for (i = 0; i < recipients_count; i++)
2349 raw_recipients[i] = string_copy(recipients_list[i].address);
2350 raw_recipients_count = recipients_count;
2351 }
2352
2353 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2354 recipients will get here only if the conditions were right (allow_unqualified_
2355 recipient is TRUE). */
2356
2357 for (i = 0; i < recipients_count; i++)
2358 recipients_list[i].address =
2359 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2360 global_rewrite_rules, rewrite_existflags);
2361
2362 /* If there is no From: header, generate one for local (without
2363 suppress_local_fixups) or submission_mode messages. If there is no sender
2364 address, but the sender is local or this is a local delivery error, use the
2365 originator login. This shouldn't happen for genuine bounces, but might happen
2366 for autoreplies. The addition of From: must be done *before* checking for the
2367 possible addition of a Sender: header, because untrusted_set_sender allows an
2368 untrusted user to set anything in the envelope (which might then get info
2369 From:) but we still want to ensure a valid Sender: if it is required. */
2370
2371 if (from_header == NULL &&
2372 ((sender_host_address == NULL && !suppress_local_fixups)
2373 || submission_mode))
2374 {
2375 uschar *oname = US"";
2376
2377 /* Use the originator_name if this is a locally submitted message and the
2378 caller is not trusted. For trusted callers, use it only if -F was used to
2379 force its value or if we have a non-SMTP message for which -f was not used
2380 to set the sender. */
2381
2382 if (sender_host_address == NULL)
2383 {
2384 if (!trusted_caller || sender_name_forced ||
2385 (!smtp_input && !sender_address_forced))
2386 oname = originator_name;
2387 }
2388
2389 /* For non-locally submitted messages, the only time we use the originator
2390 name is when it was forced by the /name= option on control=submission. */
2391
2392 else
2393 {
2394 if (submission_name != NULL) oname = submission_name;
2395 }
2396
2397 /* Envelope sender is empty */
2398
2399 if (sender_address[0] == 0)
2400 {
2401 uschar *fromstart, *fromend;
2402
2403 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2404 oname, (oname[0] == 0)? "" : " <");
2405 fromend = (oname[0] == 0)? US"" : US">";
2406
2407 if (sender_local || local_error_message)
2408 {
2409 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2410 local_part_quote(originator_login), qualify_domain_sender,
2411 fromend);
2412 }
2413 else if (submission_mode && authenticated_id != NULL)
2414 {
2415 if (submission_domain == NULL)
2416 {
2417 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2418 local_part_quote(authenticated_id), qualify_domain_sender,
2419 fromend);
2420 }
2421 else if (submission_domain[0] == 0) /* empty => whole address set */
2422 {
2423 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2424 fromend);
2425 }
2426 else
2427 {
2428 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2429 local_part_quote(authenticated_id), submission_domain,
2430 fromend);
2431 }
2432 from_header = header_last; /* To get it checked for Sender: */
2433 }
2434 }
2435
2436 /* There is a non-null envelope sender. Build the header using the original
2437 sender address, before any rewriting that might have been done while
2438 verifying it. */
2439
2440 else
2441 {
2442 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2443 oname,
2444 (oname[0] == 0)? "" : " <",
2445 (sender_address_unrewritten == NULL)?
2446 sender_address : sender_address_unrewritten,
2447 (oname[0] == 0)? "" : ">");
2448
2449 from_header = header_last; /* To get it checked for Sender: */
2450 }
2451 }
2452
2453
2454 /* If the sender is local (without suppress_local_fixups), or if we are in
2455 submission mode and there is an authenticated_id, check that an existing From:
2456 is correct, and if not, generate a Sender: header, unless disabled. Any
2457 previously-existing Sender: header was removed above. Note that sender_local,
2458 as well as being TRUE if the caller of exim is not trusted, is also true if a
2459 trusted caller did not supply a -f argument for non-smtp input. To allow
2460 trusted callers to forge From: without supplying -f, we have to test explicitly
2461 here. If the From: header contains more than one address, then the call to
2462 parse_extract_address fails, and a Sender: header is inserted, as required. */
2463
2464 if (from_header != NULL &&
2465 (active_local_from_check &&
2466 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2467 (submission_mode && authenticated_id != NULL))
2468 ))
2469 {
2470 BOOL make_sender = TRUE;
2471 int start, end, domain;
2472 uschar *errmess;
2473 uschar *from_address =
2474 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2475 &start, &end, &domain, FALSE);
2476 uschar *generated_sender_address;
2477
2478 if (submission_mode)
2479 {
2480 if (submission_domain == NULL)
2481 {
2482 generated_sender_address = string_sprintf("%s@%s",
2483 local_part_quote(authenticated_id), qualify_domain_sender);
2484 }
2485 else if (submission_domain[0] == 0) /* empty => full address */
2486 {
2487 generated_sender_address = string_sprintf("%s",
2488 authenticated_id);
2489 }
2490 else
2491 {
2492 generated_sender_address = string_sprintf("%s@%s",
2493 local_part_quote(authenticated_id), submission_domain);
2494 }
2495 }
2496 else
2497 generated_sender_address = string_sprintf("%s@%s",
2498 local_part_quote(originator_login), qualify_domain_sender);
2499
2500 /* Remove permitted prefixes and suffixes from the local part of the From:
2501 address before doing the comparison with the generated sender. */
2502
2503 if (from_address != NULL)
2504 {
2505 int slen;
2506 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2507
2508 if (at != NULL) *at = 0;
2509 from_address += route_check_prefix(from_address, local_from_prefix);
2510 slen = route_check_suffix(from_address, local_from_suffix);
2511 if (slen > 0)
2512 {
2513 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2514 from_address += slen;
2515 }
2516 if (at != NULL) *at = '@';
2517
2518 if (strcmpic(generated_sender_address, from_address) == 0 ||
2519 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2520 make_sender = FALSE;
2521 }
2522
2523 /* We have to cause the Sender header to be rewritten if there are
2524 appropriate rewriting rules. */
2525
2526 if (make_sender)
2527 {
2528 if (submission_mode && submission_name == NULL)
2529 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2530 generated_sender_address);
2531 else
2532 header_add(htype_sender, "%sSender: %s <%s>\n",
2533 resent_prefix,
2534 submission_mode? submission_name : originator_name,
2535 generated_sender_address);
2536 }
2537
2538 /* Ensure that a non-null envelope sender address corresponds to the
2539 submission mode sender address. */
2540
2541 if (submission_mode && sender_address[0] != 0)
2542 {
2543 if (sender_address_unrewritten == NULL)
2544 sender_address_unrewritten = sender_address;
2545 sender_address = generated_sender_address;
2546 log_write(L_address_rewrite, LOG_MAIN,
2547 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2548 sender_address_unrewritten, generated_sender_address);
2549 }
2550 }
2551
2552
2553 /* If there are any rewriting rules, apply them to the sender address, unless
2554 it has already been rewritten as part of verification for SMTP input. */
2555
2556 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2557 sender_address[0] != 0)
2558 {
2559 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2560 global_rewrite_rules, rewrite_existflags);
2561 DEBUG(D_receive|D_rewrite)
2562 debug_printf("rewritten sender = %s\n", sender_address);
2563 }
2564
2565
2566 /* The headers must be run through rewrite_header(), because it ensures that
2567 addresses are fully qualified, as well as applying any rewriting rules that may
2568 exist.
2569
2570 Qualification of header addresses in a message from a remote host happens only
2571 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2572 appropriate. For local messages, qualification always happens, unless -bnq is
2573 used to explicitly suppress it. No rewriting is done for an unqualified address
2574 that is left untouched.
2575
2576 We start at the second header, skipping our own Received:. This rewriting is
2577 documented as happening *after* recipient addresses are taken from the headers
2578 by the -t command line option. An added Sender: gets rewritten here. */
2579
2580 for (h = header_list->next; h != NULL; h = h->next)
2581 {
2582 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2583 rewrite_existflags, TRUE);
2584 if (newh != NULL) h = newh;
2585 }
2586
2587
2588 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2589 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2590 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2591 exists, this applies to the set of resent- headers rather than the normal set.
2592
2593 The requirement for a recipient header has been removed in RFC 2822. At this
2594 point in the code, earlier versions of Exim added a To: header for locally
2595 submitted messages, and an empty Bcc: header for others. In the light of the
2596 changes in RFC 2822, this was dropped in November 2003. */
2597
2598
2599 /* If there is no date header, generate one if the message originates locally
2600 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2601 submission mode flag is set. Messages without Date: are not valid, but it seems
2602 to be more confusing if Exim adds one to all remotely-originated messages. */
2603
2604 if (!date_header_exists &&
2605 ((sender_host_address == NULL && !suppress_local_fixups)
2606 || submission_mode))
2607 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2608
2609 search_tidyup(); /* Free any cached resources */
2610
2611 /* Show the complete set of headers if debugging. Note that the first one (the
2612 new Received:) has not yet been set. */
2613
2614 DEBUG(D_receive)
2615 {
2616 debug_printf(">>Headers after rewriting and local additions:\n");
2617 for (h = header_list->next; h != NULL; h = h->next)
2618 debug_printf("%c %s", h->type, h->text);
2619 debug_printf("\n");
2620 }
2621
2622 /* The headers are now complete in store. If we are running in filter
2623 testing mode, that is all this function does. Return TRUE if the message
2624 ended with a dot. */
2625
2626 if (filter_test != FTEST_NONE)
2627 {
2628 process_info[process_info_len] = 0;
2629 return message_ended == END_DOT;
2630 }
2631
2632 /* Open a new spool file for the data portion of the message. We need
2633 to access it both via a file descriptor and a stream. Try to make the
2634 directory if it isn't there. Note re use of sprintf: spool_directory
2635 is checked on input to be < 200 characters long. */
2636
2637 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2638 message_id);
2639 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2640 if (data_fd < 0)
2641 {
2642 if (errno == ENOENT)
2643 {
2644 uschar temp[16];
2645 sprintf(CS temp, "input/%s", message_subdir);
2646 if (message_subdir[0] == 0) temp[5] = 0;
2647 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2648 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2649 }
2650 if (data_fd < 0)
2651 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2652 spool_name, strerror(errno));
2653 }
2654
2655 /* Make sure the file's group is the Exim gid, and double-check the mode
2656 because the group setting doesn't always get set automatically. */
2657
2658 (void)fchown(data_fd, exim_uid, exim_gid);
2659 (void)fchmod(data_fd, SPOOL_MODE);
2660
2661 /* We now have data file open. Build a stream for it and lock it. We lock only
2662 the first line of the file (containing the message ID) because otherwise there
2663 are problems when Exim is run under Cygwin (I'm told). See comments in
2664 spool_in.c, where the same locking is done. */
2665
2666 data_file = fdopen(data_fd, "w+");
2667 lock_data.l_type = F_WRLCK;
2668 lock_data.l_whence = SEEK_SET;
2669 lock_data.l_start = 0;
2670 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2671
2672 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2673 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2674 errno, strerror(errno));
2675
2676 /* We have an open, locked data file. Write the message id to it to make it
2677 self-identifying. Then read the remainder of the input of this message and
2678 write it to the data file. If the variable next != NULL, it contains the first
2679 data line (which was read as a header but then turned out not to have the right
2680 format); write it (remembering that it might contain binary zeros). The result
2681 of fwrite() isn't inspected; instead we call ferror() below. */
2682
2683 fprintf(data_file, "%s-D\n", message_id);
2684 if (next != NULL)
2685 {
2686 uschar *s = next->text;
2687 int len = next->slen;
2688 (void)fwrite(s, 1, len, data_file);
2689 body_linecount++; /* Assumes only 1 line */
2690 }
2691
2692 /* Note that we might already be at end of file, or the logical end of file
2693 (indicated by '.'), or might have encountered an error while writing the
2694 message id or "next" line. */
2695
2696 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2697 {
2698 if (smtp_input)
2699 {
2700 message_ended = read_message_data_smtp(data_file);
2701 receive_linecount++; /* The terminating "." line */
2702 }
2703 else message_ended = read_message_data(data_file);
2704
2705 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2706 message_linecount += body_linecount;
2707
2708 /* Handle premature termination of SMTP */
2709
2710 if (smtp_input && message_ended == END_EOF)
2711 {
2712 Uunlink(spool_name); /* Lose data file when closed */
2713 message_id[0] = 0; /* Indicate no message accepted */
2714 smtp_reply = handle_lost_connection(US"");
2715 smtp_yield = FALSE;
2716 goto TIDYUP; /* Skip to end of function */
2717 }
2718
2719 /* Handle message that is too big. Don't use host_or_ident() in the log
2720 message; we want to see the ident value even for non-remote messages. */
2721
2722 if (message_ended == END_SIZE)
2723 {
2724 Uunlink(spool_name); /* Lose the data file when closed */
2725 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2726
2727 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2728 "message too big: read=%d max=%d",
2729 sender_address,
2730 (sender_fullhost == NULL)? "" : " H=",
2731 (sender_fullhost == NULL)? US"" : sender_fullhost,
2732 (sender_ident == NULL)? "" : " U=",
2733 (sender_ident == NULL)? US"" : sender_ident,
2734 message_size,
2735 thismessage_size_limit);
2736
2737 if (smtp_input)
2738 {
2739 smtp_reply = US"552 Message size exceeds maximum permitted";
2740 message_id[0] = 0; /* Indicate no message accepted */
2741 goto TIDYUP; /* Skip to end of function */
2742 }
2743 else
2744 {
2745 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2746 give_local_error(ERRMESS_TOOBIG,
2747 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2748 US"message rejected: ", error_rc, data_file, header_list);
2749 /* Does not return */
2750 }
2751 }
2752 }
2753
2754 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2755 example, there may be some expansion in an ACL that uses a timer.) */
2756
2757 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2758
2759 /* The message body has now been read into the data file. Call fflush() to
2760 empty the buffers in C, and then call fsync() to get the data written out onto
2761 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2762 having to do this). If there was an I/O error on either input or output,
2763 attempt to send an error message, and unlink the spool file. For non-SMTP input
2764 we can then give up. Note that for SMTP input we must swallow the remainder of
2765 the input in cases of output errors, since the far end doesn't expect to see
2766 anything until the terminating dot line is sent. */
2767
2768 if (fflush(data_file) == EOF || ferror(data_file) ||
2769 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2770 {
2771 uschar *msg_errno = US strerror(errno);
2772 BOOL input_error = (receive_ferror)() != 0;
2773 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2774 input_error? "Input read" : "Spool write",
2775 msg_errno,
2776 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2777
2778 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2779 Uunlink(spool_name); /* Lose the data file */
2780
2781 if (smtp_input)
2782 {
2783 if (input_error)
2784 smtp_reply = US"451 Error while reading input data";
2785 else
2786 {
2787 smtp_reply = US"451 Error while writing spool file";
2788 receive_swallow_smtp();
2789 }
2790 message_id[0] = 0; /* Indicate no message accepted */
2791 goto TIDYUP; /* Skip to end of function */
2792 }
2793
2794 else
2795 {
2796 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2797 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2798 header_list);
2799 /* Does not return */
2800 }
2801 }
2802
2803
2804 /* No I/O errors were encountered while writing the data file. */
2805
2806 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2807
2808
2809 /* If there were any bad addresses extracted by -t, or there were no recipients
2810 left after -t, send a message to the sender of this message, or write it to
2811 stderr if the error handling option is set that way. Note that there may
2812 legitimately be no recipients for an SMTP message if they have all been removed
2813 by "discard".
2814
2815 We need to rewind the data file in order to read it. In the case of no
2816 recipients or stderr error writing, throw the data file away afterwards, and
2817 exit. (This can't be SMTP, which always ensures there's at least one
2818 syntactically good recipient address.) */
2819
2820 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2821 {
2822 DEBUG(D_receive)
2823 {
2824 if (recipients_count == 0) debug_printf("*** No recipients\n");
2825 if (bad_addresses != NULL)
2826 {
2827 error_block *eblock = bad_addresses;
2828 debug_printf("*** Bad address(es)\n");
2829 while (eblock != NULL)
2830 {
2831 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2832 eblock = eblock->next;
2833 }
2834 }
2835 }
2836
2837 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2838
2839 /* If configured to send errors to the sender, but this fails, force
2840 a failure error code. We use a special one for no recipients so that it
2841 can be detected by the autoreply transport. Otherwise error_rc is set to
2842 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2843 it is EXIT_SUCCESS. */
2844
2845 if (error_handling == ERRORS_SENDER)
2846 {
2847 if (!moan_to_sender(
2848 (bad_addresses == NULL)?
2849 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2850 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2851 bad_addresses, header_list, data_file, FALSE))
2852 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2853 }
2854 else
2855 {
2856 if (bad_addresses == NULL)
2857 {
2858 if (extracted_ignored)
2859 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2860 else
2861 fprintf(stderr, "exim: no recipients in message\n");
2862 }
2863 else
2864 {
2865 fprintf(stderr, "exim: invalid address%s",
2866 (bad_addresses->next == NULL)? ":" : "es:\n");
2867 while (bad_addresses != NULL)
2868 {
2869 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2870 bad_addresses->text2);
2871 bad_addresses = bad_addresses->next;
2872 }
2873 }
2874 }
2875
2876 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2877 {
2878 Uunlink(spool_name);
2879 (void)fclose(data_file);
2880 exim_exit(error_rc);
2881 }
2882 }
2883
2884 /* Data file successfully written. Generate text for the Received: header by
2885 expanding the configured string, and adding a timestamp. By leaving this
2886 operation till now, we ensure that the timestamp is the time that message
2887 reception was completed. However, this is deliberately done before calling the
2888 data ACL and local_scan().
2889
2890 This Received: header may therefore be inspected by the data ACL and by code in
2891 the local_scan() function. When they have run, we update the timestamp to be
2892 the final time of reception.
2893
2894 If there is just one recipient, set up its value in the $received_for variable
2895 for use when we generate the Received: header.
2896
2897 Note: the checking for too many Received: headers is handled by the delivery
2898 code. */
2899
2900 timestamp = expand_string(US"${tod_full}");
2901 if (recipients_count == 1) received_for = recipients_list[0].address;
2902 received = expand_string(received_header_text);
2903 received_for = NULL;
2904
2905 if (received == NULL)
2906 {
2907 Uunlink(spool_name); /* Lose the data file */
2908 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2909 "(received_header_text) failed: %s", string_printing(received_header_text),
2910 expand_string_message);
2911 }
2912
2913 /* The first element on the header chain is reserved for the Received header,
2914 so all we have to do is fill in the text pointer, and set the type. However, if
2915 the result of the expansion is an empty string, we leave the header marked as
2916 "old" so as to refrain from adding a Received header. */
2917
2918 if (received[0] == 0)
2919 {
2920 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2921 received_header->type = htype_old;
2922 }
2923 else
2924 {
2925 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2926 received_header->type = htype_received;
2927 }
2928
2929 received_header->slen = Ustrlen(received_header->text);
2930
2931 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2932 received_header->type, received_header->text);
2933
2934 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2935
2936 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2937 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2938
2939 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2940 now, before running the DATA ACL. */
2941
2942 add_acl_headers(US"MAIL or RCPT");
2943
2944 /* If an ACL is specified for checking things at this stage of reception of a
2945 message, run it, unless all the recipients were removed by "discard" in earlier
2946 ACLs. That is the only case in which recipients_count can be zero at this
2947 stage. Set deliver_datafile to point to the data file so that $message_body and
2948 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2949 */
2950
2951 deliver_datafile = data_fd;
2952 user_msg = NULL;
2953
2954 enable_dollar_recipients = TRUE;
2955
2956 if (recipients_count == 0)
2957 {
2958 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2959 }
2960 else
2961 {
2962 /* Handle interactive SMTP messages */
2963
2964 if (smtp_input && !smtp_batched_input)
2965 {
2966
2967 #ifdef EXPERIMENTAL_DOMAINKEYS
2968 dk_exim_verify_finish();
2969 #endif
2970
2971 #ifdef WITH_CONTENT_SCAN
2972 if (acl_smtp_mime != NULL &&
2973 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
2974 goto TIDYUP;
2975 #endif /* WITH_CONTENT_SCAN */
2976
2977 /* Check the recipients count again, as the MIME ACL might have changed
2978 them. */
2979
2980 if (acl_smtp_data != NULL && recipients_count > 0)
2981 {
2982 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
2983 add_acl_headers(US"DATA");
2984 if (rc == DISCARD)
2985 {
2986 recipients_count = 0;
2987 blackholed_by = US"DATA ACL";
2988 if (log_msg != NULL)
2989 blackhole_log_msg = string_sprintf(": %s", log_msg);
2990 }
2991 else if (rc != OK)
2992 {
2993 Uunlink(spool_name);
2994 #ifdef WITH_CONTENT_SCAN
2995 unspool_mbox();
2996 #endif
2997 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
2998 smtp_yield = FALSE; /* No more messsages after dropped connection */
2999 smtp_reply = US""; /* Indicate reply already sent */
3000 message_id[0] = 0; /* Indicate no message accepted */
3001 goto TIDYUP; /* Skip to end of function */
3002 }
3003 }
3004 }
3005
3006 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3007 we cannot take different actions for permanent and temporary rejections. */
3008
3009 else
3010 {
3011
3012 #ifdef WITH_CONTENT_SCAN
3013 if (acl_not_smtp_mime != NULL &&
3014 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3015 &blackholed_by))
3016 goto TIDYUP;
3017 #endif /* WITH_CONTENT_SCAN */
3018
3019 if (acl_not_smtp != NULL)
3020 {
3021 uschar *user_msg, *log_msg;
3022 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3023 if (rc == DISCARD)
3024 {
3025 recipients_count = 0;
3026 blackholed_by = US"non-SMTP ACL";
3027 if (log_msg != NULL)
3028 blackhole_log_msg = string_sprintf(": %s", log_msg);
3029 }
3030 else if (rc != OK)
3031 {
3032 Uunlink(spool_name);
3033 #ifdef WITH_CONTENT_SCAN
3034 unspool_mbox();
3035 #endif
3036 /* The ACL can specify where rejections are to be logged, possibly
3037 nowhere. The default is main and reject logs. */
3038
3039 if (log_reject_target != 0)
3040 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3041 sender_address, log_msg);
3042
3043 if (user_msg == NULL) user_msg = US"local configuration problem";
3044 if (smtp_batched_input)
3045 {
3046 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3047 /* Does not return */
3048 }
3049 else
3050 {
3051 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3052 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3053 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3054 header_list);
3055 /* Does not return */
3056 }
3057 }
3058 add_acl_headers(US"non-SMTP");
3059 }
3060 }
3061
3062 /* The applicable ACLs have been run */
3063
3064 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3065 if (queue_only_policy) queued_by = US"ACL";
3066 }
3067
3068 #ifdef WITH_CONTENT_SCAN
3069 unspool_mbox();
3070 #endif
3071
3072 /* The final check on the message is to run the scan_local() function. The
3073 version supplied with Exim always accepts, but this is a hook for sysadmins to
3074 supply their own checking code. The local_scan() function is run even when all
3075 the recipients have been discarded. */
3076
3077 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3078
3079 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3080 deleted, and the incident gets logged. */
3081
3082 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3083 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3084 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3085 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3086
3087 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3088 local_scan_timeout);
3089 local_scan_data = NULL;
3090
3091 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3092 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3093 rc = local_scan(data_fd, &local_scan_data);
3094 alarm(0);
3095 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3096
3097 enable_dollar_recipients = FALSE;
3098
3099 store_pool = POOL_MAIN; /* In case changed */
3100 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3101 local_scan_data);
3102
3103 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3104 os_non_restarting_signal(SIGFPE, SIG_DFL);
3105 os_non_restarting_signal(SIGILL, SIG_DFL);
3106 os_non_restarting_signal(SIGBUS, SIG_DFL);
3107
3108 /* The length check is paranoia against some runaway code, and also because
3109 (for a success return) lines in the spool file are read into big_buffer. */
3110
3111 if (local_scan_data != NULL)
3112 {
3113 int len = Ustrlen(local_scan_data);
3114 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3115 local_scan_data = string_copyn(local_scan_data, len);
3116 }
3117
3118 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3119 {
3120 if (!deliver_freeze) /* ACL might have already frozen */
3121 {
3122 deliver_freeze = TRUE;
3123 deliver_frozen_at = time(NULL);
3124 frozen_by = US"local_scan()";
3125 }
3126 rc = LOCAL_SCAN_ACCEPT;
3127 }
3128 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3129 {
3130 if (!queue_only_policy) /* ACL might have already queued */
3131 {
3132 queue_only_policy = TRUE;
3133 queued_by = US"local_scan()";
3134 }
3135 rc = LOCAL_SCAN_ACCEPT;
3136 }
3137
3138 /* Message accepted: remove newlines in local_scan_data because otherwise
3139 the spool file gets corrupted. Ensure that all recipients are qualified. */
3140
3141 if (rc == LOCAL_SCAN_ACCEPT)
3142 {
3143 if (local_scan_data != NULL)
3144 {
3145 uschar *s;
3146 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3147 }
3148 for (i = 0; i < recipients_count; i++)
3149 {
3150 recipient_item *r = recipients_list + i;
3151 r->address = rewrite_address_qualify(r->address, TRUE);
3152 if (r->errors_to != NULL)
3153 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3154 }
3155 if (recipients_count == 0 && blackholed_by == NULL)
3156 blackholed_by = US"local_scan";
3157 }
3158
3159 /* Message rejected: newlines permitted in local_scan_data to generate
3160 multiline SMTP responses. */
3161
3162 else
3163 {
3164 uschar *istemp = US"";
3165 uschar *s = NULL;
3166 uschar *smtp_code;
3167 int size = 0;
3168 int sptr = 0;
3169
3170 errmsg = local_scan_data;
3171
3172 Uunlink(spool_name); /* Cancel this message */
3173 switch(rc)
3174 {
3175 default:
3176 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3177 "rejection given", rc);
3178 goto TEMPREJECT;
3179
3180 case LOCAL_SCAN_REJECT_NOLOGHDR:
3181 log_extra_selector &= ~LX_rejected_header;
3182 /* Fall through */
3183
3184 case LOCAL_SCAN_REJECT:
3185 smtp_code = US"550";
3186 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3187 break;
3188
3189 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3190 log_extra_selector &= ~LX_rejected_header;
3191 /* Fall through */
3192
3193 case LOCAL_SCAN_TEMPREJECT:
3194 TEMPREJECT:
3195 smtp_code = US"451";
3196 if (errmsg == NULL) errmsg = US"Temporary local problem";
3197 istemp = US"temporarily ";
3198 break;
3199 }
3200
3201 s = string_append(s, &size, &sptr, 2, US"F=",
3202 (sender_address[0] == 0)? US"<>" : sender_address);
3203 s = add_host_info_for_log(s, &size, &sptr);
3204 s[sptr] = 0;
3205
3206 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3207 s, istemp, string_printing(errmsg));
3208
3209 if (smtp_input)
3210 {
3211 if (!smtp_batched_input)
3212 {
3213 smtp_respond(smtp_code, 3, TRUE, errmsg);
3214 message_id[0] = 0; /* Indicate no message accepted */
3215 smtp_reply = US""; /* Indicate reply already sent */
3216 goto TIDYUP; /* Skip to end of function */
3217 }
3218 else
3219 {
3220 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3221 /* Does not return */
3222 }
3223 }
3224 else
3225 {
3226 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3227 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3228 US"message rejected by local scan code: ", error_rc, data_file,
3229 header_list);
3230 /* Does not return */
3231 }
3232 }
3233
3234 /* Reset signal handlers to ignore signals that previously would have caused
3235 the message to be abandoned. */
3236
3237 signal(SIGTERM, SIG_IGN);
3238 signal(SIGINT, SIG_IGN);
3239
3240 /* Ensure the first time flag is set in the newly-received message. */
3241
3242 deliver_firsttime = TRUE;
3243
3244 #ifdef EXPERIMENTAL_BRIGHTMAIL
3245 if (bmi_run == 1) {
3246 /* rewind data file */
3247 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3248 bmi_verdicts = bmi_process_message(header_list, data_fd);
3249 };
3250 #endif
3251
3252 /* Update the timstamp in our Received: header to account for any time taken by
3253 an ACL or by local_scan(). The new time is the time that all reception
3254 processing is complete. */
3255
3256 timestamp = expand_string(US"${tod_full}");
3257 tslen = Ustrlen(timestamp);
3258
3259 memcpy(received_header->text + received_header->slen - tslen - 1,
3260 timestamp, tslen);
3261
3262 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3263
3264 if (mua_wrapper)
3265 {
3266 deliver_freeze = FALSE;
3267 queue_only_policy = FALSE;
3268 }
3269
3270 /* Keep the data file open until we have written the header file, in order to
3271 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3272 don't write the header file, and we unlink the data file. If writing the header
3273 file fails, we have failed to accept this message. */
3274
3275 if (host_checking || blackholed_by != NULL)
3276 {
3277 header_line *h;
3278 Uunlink(spool_name);
3279 msg_size = 0; /* Compute size for log line */
3280 for (h = header_list; h != NULL; h = h->next)
3281 if (h->type != '*') msg_size += h->slen;
3282 }
3283
3284 /* Write the -H file */
3285
3286 else
3287 {
3288 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3289 {
3290 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3291 Uunlink(spool_name); /* Lose the data file */
3292
3293 if (smtp_input)
3294 {
3295 smtp_reply = US"451 Error in writing spool file";
3296 message_id[0] = 0; /* Indicate no message accepted */
3297 goto TIDYUP;
3298 }
3299 else
3300 {
3301 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3302 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3303 header_list);
3304 /* Does not return */
3305 }
3306 }
3307 }
3308
3309
3310 /* The message has now been successfully received. */
3311
3312 receive_messagecount++;
3313
3314 /* In SMTP sessions we may receive several in one connection. After each one,
3315 we wait for the clock to tick at the level of message-id granularity. This is
3316 so that the combination of time+pid is unique, even on systems where the pid
3317 can be re-used within our time interval. We can't shorten the interval without
3318 re-designing the message-id. See comments above where the message id is
3319 created. This is Something For The Future. */
3320
3321 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3322 exim_wait_tick(&message_id_tv, id_resolution);
3323
3324 /* Add data size to written header size. We do not count the initial file name
3325 that is in the file, but we do add one extra for the notional blank line that
3326 precedes the data. This total differs from message_size in that it include the
3327 added Received: header and any other headers that got created locally. */
3328
3329 fflush(data_file);
3330 fstat(data_fd, &statbuf);
3331
3332 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3333
3334 /* Generate a "message received" log entry. We do this by building up a dynamic
3335 string as required. Since we commonly want to add two items at a time, use a
3336 macro to simplify the coding. We log the arrival of a new message while the
3337 file is still locked, just in case the machine is *really* fast, and delivers
3338 it first! Include any message id that is in the message - since the syntax of a
3339 message id is actually an addr-spec, we can use the parse routine to canonicize
3340 it. */
3341
3342 size = 256;
3343 sptr = 0;
3344 s = store_get(size);
3345
3346 s = string_append(s, &size, &sptr, 2, US"<= ",
3347 (sender_address[0] == 0)? US"<>" : sender_address);
3348 if (message_reference != NULL)
3349 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3350
3351 s = add_host_info_for_log(s, &size, &sptr);
3352
3353 #ifdef SUPPORT_TLS
3354 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3355 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3356 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3357 tls_cipher != NULL)
3358 s = string_append(s, &size, &sptr, 2, US" CV=",
3359 tls_certificate_verified? "yes":"no");
3360 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3361 s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\"");
3362 #endif
3363
3364 if (sender_host_authenticated != NULL)
3365 {
3366 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3367 if (authenticated_id != NULL)
3368 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3369 }
3370
3371 sprintf(CS big_buffer, "%d", msg_size);
3372 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3373
3374 /* If an addr-spec in a message-id contains a quoted string, it can contain
3375 any characters except " \ and CR and so in particular it can contain NL!
3376 Therefore, make sure we use a printing-characters only version for the log.
3377 Also, allow for domain literals in the message id. */
3378
3379 if (msgid_header != NULL)
3380 {
3381 uschar *old_id;
3382 BOOL save_allow_domain_literals = allow_domain_literals;
3383 allow_domain_literals = TRUE;
3384 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3385 &errmsg, &start, &end, &domain, FALSE);
3386 allow_domain_literals = save_allow_domain_literals;
3387 if (old_id != NULL)
3388 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3389 }
3390
3391 /* If subject logging is turned on, create suitable printing-character
3392 text. By expanding $h_subject: we make use of the MIME decoding. */
3393
3394 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3395 {
3396 int i;
3397 uschar *p = big_buffer;
3398 uschar *ss = expand_string(US"$h_subject:");
3399
3400 /* Backslash-quote any double quotes or backslashes so as to make a
3401 a C-like string, and turn any non-printers into escape sequences. */
3402
3403 *p++ = '\"';
3404 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3405 {
3406 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3407 *p++ = ss[i];
3408 }
3409 *p++ = '\"';
3410 *p = 0;
3411 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3412 }
3413
3414 /* Terminate the string: string_cat() and string_append() leave room, but do
3415 not put the zero in. */
3416
3417 s[sptr] = 0;
3418
3419 /* Create a message log file if message logs are being used and this message is
3420 not blackholed. Write the reception stuff to it. We used to leave message log
3421 creation until the first delivery, but this has proved confusing for somep
3422 people. */
3423
3424 if (message_logs && blackholed_by == NULL)
3425 {
3426 int fd;
3427
3428 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3429 message_id);
3430 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3431
3432 if (fd < 0 && errno == ENOENT)
3433 {
3434 uschar temp[16];
3435 sprintf(CS temp, "msglog/%s", message_subdir);
3436 if (message_subdir[0] == 0) temp[6] = 0;
3437 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3438 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3439 }
3440
3441 if (fd < 0)
3442 {
3443 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3444 spool_name, strerror(errno));
3445 }
3446
3447 else
3448 {
3449 FILE *message_log = fdopen(fd, "a");
3450 if (message_log == NULL)
3451 {
3452 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3453 spool_name, strerror(errno));
3454 (void)close(fd);
3455 }
3456 else
3457 {
3458 uschar *now = tod_stamp(tod_log);
3459 fprintf(message_log, "%s Received from %s\n", now, s+3);
3460 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3461 frozen_by);
3462 if (queue_only_policy) fprintf(message_log,
3463 "%s no immediate delivery: queued by %s\n", now, queued_by);
3464 (void)fclose(message_log);
3465 }
3466 }
3467 }
3468
3469 /* Everything has now been done for a successful message except logging its
3470 arrival, and outputting an SMTP response. While writing to the log, set a flag
3471 to cause a call to receive_bomb_out() if the log cannot be opened. */
3472
3473 receive_call_bombout = TRUE;
3474
3475 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3476 connection has gone away. This can only be done if there is no unconsumed input
3477 waiting in the local input buffer. We can test for this by calling
3478 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3479 input to be sent following the final dot, so the presence of following input is
3480 not an error.
3481
3482 If the connection is still present, but there is no unread input for the
3483 socket, the result of a select() call will be zero. If, however, the connection
3484 has gone away, or if there is pending input, the result of select() will be
3485 non-zero. The two cases can be distinguished by trying to read the next input
3486 character. If we succeed, we can unread it so that it remains in the local
3487 buffer for handling later. If not, the connection has been lost.
3488
3489 Of course, since TCP/IP is asynchronous, there is always a chance that the
3490 connection will vanish between the time of this test and the sending of the
3491 response, but the chance of this happening should be small. */
3492
3493 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3494 !receive_smtp_buffered())