e0c1c73939325ad31668a735ced5eb0a8d259916
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 /* Code for receiving a message and setting up spool files. */
9
10 #include "exim.h"
11
12 #ifdef EXPERIMENTAL_DCC
13 extern int dcc_ok;
14 #endif
15
16 /*************************************************
17 * Local static variables *
18 *************************************************/
19
20 static FILE *data_file = NULL;
21 static int data_fd = -1;
22 static uschar spool_name[256];
23
24
25
26 /*************************************************
27 * Non-SMTP character reading functions *
28 *************************************************/
29
30 /* These are the default functions that are set up in the variables such as
31 receive_getc initially. They just call the standard functions, passing stdin as
32 the file. (When SMTP input is occurring, different functions are used by
33 changing the pointer variables.) */
34
35 int
36 stdin_getc(void)
37 {
38 return getc(stdin);
39 }
40
41 int
42 stdin_ungetc(int c)
43 {
44 return ungetc(c, stdin);
45 }
46
47 int
48 stdin_feof(void)
49 {
50 return feof(stdin);
51 }
52
53 int
54 stdin_ferror(void)
55 {
56 return ferror(stdin);
57 }
58
59
60
61
62 /*************************************************
63 * Check that a set sender is allowed *
64 *************************************************/
65
66 /* This function is called when a local caller sets an explicit sender address.
67 It checks whether this is permitted, which it is for trusted callers.
68 Otherwise, it must match the pattern(s) in untrusted_set_sender.
69
70 Arguments: the proposed sender address
71 Returns: TRUE for a trusted caller
72 TRUE if the address has been set, untrusted_set_sender has been
73 set, and the address matches something in the list
74 FALSE otherwise
75 */
76
77 BOOL
78 receive_check_set_sender(uschar *newsender)
79 {
80 uschar *qnewsender;
81 if (trusted_caller) return TRUE;
82 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
83 qnewsender = (Ustrchr(newsender, '@') != NULL)?
84 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
85 return
86 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
87 0, NULL) == OK;
88 }
89
90
91
92
93 /*************************************************
94 * Read space info for a partition *
95 *************************************************/
96
97 /* This function is called by receive_check_fs() below, and also by string
98 expansion for variables such as $spool_space. The field names for the statvfs
99 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
100 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
101 have inodes, and they return -1 for the number available.
102
103 Later: It turns out that some file systems that do not have the concept of
104 inodes return 0 rather than -1. Such systems should also return 0 for the total
105 number of inodes, so we require that to be greater than zero before returning
106 an inode count.
107
108 Arguments:
109 isspool TRUE for spool partition, FALSE for log partition
110 inodeptr address of int to receive inode count; -1 if there isn't one
111
112 Returns: available on-root space, in kilobytes
113 -1 for log partition if there isn't one
114
115 All values are -1 if the STATFS functions are not available.
116 */
117
118 int
119 receive_statvfs(BOOL isspool, int *inodeptr)
120 {
121 #ifdef HAVE_STATFS
122 struct STATVFS statbuf;
123 uschar *path;
124 uschar *name;
125 uschar buffer[1024];
126
127 /* The spool directory must always exist. */
128
129 if (isspool)
130 {
131 path = spool_directory;
132 name = US"spool";
133 }
134
135 /* Need to cut down the log file path to the directory, and to ignore any
136 appearance of "syslog" in it. */
137
138 else
139 {
140 int sep = ':'; /* Not variable - outside scripts use */
141 uschar *p = log_file_path;
142 name = US"log";
143
144 /* An empty log_file_path means "use the default". This is the same as an
145 empty item in a list. */
146
147 if (*p == 0) p = US":";
148 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
149 {
150 if (Ustrcmp(path, "syslog") != 0) break;
151 }
152
153 if (path == NULL) /* No log files */
154 {
155 *inodeptr = -1;
156 return -1;
157 }
158
159 /* An empty string means use the default, which is in the spool directory.
160 But don't just use the spool directory, as it is possible that the log
161 subdirectory has been symbolically linked elsewhere. */
162
163 if (path[0] == 0)
164 {
165 sprintf(CS buffer, CS"%s/log", CS spool_directory);
166 path = buffer;
167 }
168 else
169 {
170 uschar *cp;
171 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
172 }
173 }
174
175 /* We now have the path; do the business */
176
177 memset(&statbuf, 0, sizeof(statbuf));
178
179 if (STATVFS(CS path, &statbuf) != 0)
180 {
181 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
182 "%s directory %s: %s", name, spool_directory, strerror(errno));
183 smtp_closedown(US"spool or log directory problem");
184 exim_exit(EXIT_FAILURE);
185 }
186
187 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
188
189 /* Disks are getting huge. Take care with computing the size in kilobytes. */
190
191 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
192
193 /* Unable to find partition sizes in this environment. */
194
195 #else
196 *inodeptr = -1;
197 return -1;
198 #endif
199 }
200
201
202
203
204 /*************************************************
205 * Check space on spool and log partitions *
206 *************************************************/
207
208 /* This function is called before accepting a message; if any thresholds are
209 set, it checks them. If a message_size is supplied, it checks that there is
210 enough space for that size plus the threshold - i.e. that the message won't
211 reduce the space to the threshold. Not all OS have statvfs(); for those that
212 don't, this function always returns TRUE. For some OS the old function and
213 struct name statfs is used; that is handled by a macro, defined in exim.h.
214
215 Arguments:
216 msg_size the (estimated) size of an incoming message
217
218 Returns: FALSE if there isn't enough space, or if the information cannot
219 be obtained
220 TRUE if no check was done or there is enough space
221 */
222
223 BOOL
224 receive_check_fs(int msg_size)
225 {
226 int space, inodes;
227
228 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
229 {
230 space = receive_statvfs(TRUE, &inodes);
231
232 DEBUG(D_receive)
233 debug_printf("spool directory space = %dK inodes = %d "
234 "check_space = %dK inodes = %d msg_size = %d\n",
235 space, inodes, check_spool_space, check_spool_inodes, msg_size);
236
237 if ((space >= 0 && space < check_spool_space) ||
238 (inodes >= 0 && inodes < check_spool_inodes))
239 {
240 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
241 "inodes=%d", space, inodes);
242 return FALSE;
243 }
244 }
245
246 if (check_log_space > 0 || check_log_inodes > 0)
247 {
248 space = receive_statvfs(FALSE, &inodes);
249
250 DEBUG(D_receive)
251 debug_printf("log directory space = %dK inodes = %d "
252 "check_space = %dK inodes = %d\n",
253 space, inodes, check_log_space, check_log_inodes);
254
255 if ((space >= 0 && space < check_log_space) ||
256 (inodes >= 0 && inodes < check_log_inodes))
257 {
258 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
259 "inodes=%d", space, inodes);
260 return FALSE;
261 }
262 }
263
264 return TRUE;
265 }
266
267
268
269 /*************************************************
270 * Bomb out while reading a message *
271 *************************************************/
272
273 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
274 received, or if there is a timeout. A rarer case might be if the log files are
275 screwed up and Exim can't open them to record a message's arrival. Handling
276 that case is done by setting a flag to cause the log functions to call this
277 function if there is an ultimate disaster. That is why it is globally
278 accessible.
279
280 Arguments:
281 reason text reason to pass to the not-quit ACL
282 msg default SMTP response to give if in an SMTP session
283 Returns: it doesn't
284 */
285
286 void
287 receive_bomb_out(uschar *reason, uschar *msg)
288 {
289 /* If spool_name is set, it contains the name of the data file that is being
290 written. Unlink it before closing so that it cannot be picked up by a delivery
291 process. Ensure that any header file is also removed. */
292
293 if (spool_name[0] != 0)
294 {
295 Uunlink(spool_name);
296 spool_name[Ustrlen(spool_name) - 1] = 'H';
297 Uunlink(spool_name);
298 }
299
300 /* Now close the file if it is open, either as a fd or a stream. */
301
302 if (data_file != NULL) (void)fclose(data_file);
303 else if (data_fd >= 0) (void)close(data_fd);
304
305 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
306 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
307 SMTP response. */
308
309 if (smtp_input)
310 {
311 if (smtp_batched_input)
312 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
313 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
314 smtp_active_hostname, msg);
315 }
316
317 /* Exit from the program (non-BSMTP cases) */
318
319 exim_exit(EXIT_FAILURE);
320 }
321
322
323 /*************************************************
324 * Data read timeout *
325 *************************************************/
326
327 /* Handler function for timeouts that occur while reading the data that
328 comprises a message.
329
330 Argument: the signal number
331 Returns: nothing
332 */
333
334 static void
335 data_timeout_handler(int sig)
336 {
337 uschar *msg = NULL;
338
339 sig = sig; /* Keep picky compilers happy */
340
341 if (smtp_input)
342 {
343 msg = US"SMTP incoming data timeout";
344 log_write(L_lost_incoming_connection,
345 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
346 "from %s F=<%s>",
347 (sender_fullhost != NULL)? sender_fullhost : US"local process",
348 sender_address);
349 }
350 else
351 {
352 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
353 log_write(L_lost_incoming_connection,
354 LOG_MAIN, "timed out while reading local message");
355 }
356
357 receive_bomb_out(US"data-timeout", msg); /* Does not return */
358 }
359
360
361
362 /*************************************************
363 * local_scan() timeout *
364 *************************************************/
365
366 /* Handler function for timeouts that occur while running a local_scan()
367 function.
368
369 Argument: the signal number
370 Returns: nothing
371 */
372
373 static void
374 local_scan_timeout_handler(int sig)
375 {
376 sig = sig; /* Keep picky compilers happy */
377 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
378 "message temporarily rejected (size %d)", message_size);
379 /* Does not return */
380 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
381 }
382
383
384
385 /*************************************************
386 * local_scan() crashed *
387 *************************************************/
388
389 /* Handler function for signals that occur while running a local_scan()
390 function.
391
392 Argument: the signal number
393 Returns: nothing
394 */
395
396 static void
397 local_scan_crash_handler(int sig)
398 {
399 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
400 "signal %d - message temporarily rejected (size %d)", sig, message_size);
401 /* Does not return */
402 receive_bomb_out(US"local-scan-error", US"local verification problem");
403 }
404
405
406 /*************************************************
407 * SIGTERM or SIGINT received *
408 *************************************************/
409
410 /* Handler for SIGTERM or SIGINT signals that occur while reading the
411 data that comprises a message.
412
413 Argument: the signal number
414 Returns: nothing
415 */
416
417 static void
418 data_sigterm_sigint_handler(int sig)
419 {
420 uschar *msg = NULL;
421
422 if (smtp_input)
423 {
424 msg = US"Service not available - SIGTERM or SIGINT received";
425 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
426 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
427 }
428 else
429 {
430 if (filter_test == FTEST_NONE)
431 {
432 fprintf(stderr, "\nexim: %s received - message abandoned\n",
433 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
434 log_write(0, LOG_MAIN, "%s received while reading local message",
435 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
436 }
437 }
438
439 receive_bomb_out(US"signal-exit", msg); /* Does not return */
440 }
441
442
443
444 /*************************************************
445 * Add new recipient to list *
446 *************************************************/
447
448 /* This function builds a list of recipient addresses in argc/argv
449 format.
450
451 Arguments:
452 recipient the next address to add to recipients_list
453 pno parent number for fixed aliases; -1 otherwise
454
455 Returns: nothing
456 */
457
458 void
459 receive_add_recipient(uschar *recipient, int pno)
460 {
461 if (recipients_count >= recipients_list_max)
462 {
463 recipient_item *oldlist = recipients_list;
464 int oldmax = recipients_list_max;
465 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
466 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
467 if (oldlist != NULL)
468 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
469 }
470
471 recipients_list[recipients_count].address = recipient;
472 recipients_list[recipients_count].pno = pno;
473 #ifdef EXPERIMENTAL_BRIGHTMAIL
474 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
475 /* reset optin string pointer for next recipient */
476 bmi_current_optin = NULL;
477 #endif
478 recipients_list[recipients_count++].errors_to = NULL;
479 }
480
481
482
483
484 /*************************************************
485 * Send user response message *
486 *************************************************/
487
488 /* This function is passed a default response code and a user message. It calls
489 smtp_message_code() to check and possibly modify the response code, and then
490 calls smtp_respond() to transmit the response. I put this into a function
491 just to avoid a lot of repetition.
492
493 Arguments:
494 code the response code
495 user_msg the user message
496
497 Returns: nothing
498 */
499
500 static void
501 smtp_user_msg(uschar *code, uschar *user_msg)
502 {
503 int len = 3;
504 smtp_message_code(&code, &len, &user_msg, NULL);
505 smtp_respond(code, len, TRUE, user_msg);
506 }
507
508
509
510
511
512 /*************************************************
513 * Remove a recipient from the list *
514 *************************************************/
515
516 /* This function is provided for local_scan() to use.
517
518 Argument:
519 recipient address to remove
520
521 Returns: TRUE if it did remove something; FALSE otherwise
522 */
523
524 BOOL
525 receive_remove_recipient(uschar *recipient)
526 {
527 int count;
528 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
529 recipient);
530 for (count = 0; count < recipients_count; count++)
531 {
532 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
533 {
534 if ((--recipients_count - count) > 0)
535 memmove(recipients_list + count, recipients_list + count + 1,
536 (recipients_count - count)*sizeof(recipient_item));
537 return TRUE;
538 }
539 }
540 return FALSE;
541 }
542
543
544
545
546
547 /*************************************************
548 * Read data portion of a non-SMTP message *
549 *************************************************/
550
551 /* This function is called to read the remainder of a message (following the
552 header) when the input is not from SMTP - we are receiving a local message on
553 a standard input stream. The message is always terminated by EOF, and is also
554 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
555 two cases for maximum efficiency.
556
557 Ensure that the body ends with a newline. This will naturally be the case when
558 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
559 as "sequences of lines" - this of course strictly applies only to SMTP, but
560 deliveries into BSD-type mailbox files also require it. Exim used to have a
561 flag for doing this at delivery time, but as it was always set for all
562 transports, I decided to simplify things by putting the check here instead.
563
564 There is at least one MUA (dtmail) that sends CRLF via this interface, and
565 other programs are known to do this as well. Exim used to have a option for
566 dealing with this: in July 2003, after much discussion, the code has been
567 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
568
569 However, for the case when a dot on a line by itself terminates a message, the
570 only recognized terminating sequences before and after the dot are LF and CRLF.
571 Otherwise, having read EOL . CR, you don't know whether to read another
572 character or not.
573
574 Internally, in messages stored in Exim's spool files, LF is used as the line
575 terminator. Under the new regime, bare CRs will no longer appear in these
576 files.
577
578 Arguments:
579 fout a FILE to which to write the message
580
581 Returns: One of the END_xxx values indicating why it stopped reading
582 */
583
584 static int
585 read_message_data(FILE *fout)
586 {
587 int ch_state;
588 register int ch;
589 register int linelength = 0;
590
591 /* Handle the case when only EOF terminates the message */
592
593 if (!dot_ends)
594 {
595 register int last_ch = '\n';
596
597 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
598 {
599 if (ch == 0) body_zerocount++;
600 if (last_ch == '\r' && ch != '\n')
601 {
602 if (linelength > max_received_linelength)
603 max_received_linelength = linelength;
604 linelength = 0;
605 if (fputc('\n', fout) == EOF) return END_WERROR;
606 message_size++;
607 body_linecount++;
608 }
609 if (ch == '\r') continue;
610
611 if (fputc(ch, fout) == EOF) return END_WERROR;
612 if (ch == '\n')
613 {
614 if (linelength > max_received_linelength)
615 max_received_linelength = linelength;
616 linelength = 0;
617 body_linecount++;
618 }
619 else linelength++;
620 if (++message_size > thismessage_size_limit) return END_SIZE;
621 }
622
623 if (last_ch != '\n')
624 {
625 if (linelength > max_received_linelength)
626 max_received_linelength = linelength;
627 if (fputc('\n', fout) == EOF) return END_WERROR;
628 message_size++;
629 body_linecount++;
630 }
631
632 return END_EOF;
633 }
634
635 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
636
637 ch_state = 1;
638
639 while ((ch = (receive_getc)()) != EOF)
640 {
641 if (ch == 0) body_zerocount++;
642 switch (ch_state)
643 {
644 case 0: /* Normal state (previous char written) */
645 if (ch == '\n')
646 {
647 body_linecount++;
648 if (linelength > max_received_linelength)
649 max_received_linelength = linelength;
650 linelength = -1;
651 ch_state = 1;
652 }
653 else if (ch == '\r')
654 { ch_state = 2; continue; }
655 break;
656
657 case 1: /* After written "\n" */
658 if (ch == '.') { ch_state = 3; continue; }
659 if (ch != '\n') ch_state = 0; else linelength = -1;
660 break;
661
662 case 2:
663 body_linecount++; /* After unwritten "\r" */
664 if (linelength > max_received_linelength)
665 max_received_linelength = linelength;
666 if (ch == '\n')
667 {
668 ch_state = 1;
669 linelength = -1;
670 }
671 else
672 {
673 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
674 if (ch == '\r') continue;
675 ch_state = 0;
676 linelength = 0;
677 }
678 break;
679
680 case 3: /* After "\n." (\n written, dot not) */
681 if (ch == '\n') return END_DOT;
682 if (ch == '\r') { ch_state = 4; continue; }
683 message_size++;
684 linelength++;
685 if (fputc('.', fout) == EOF) return END_WERROR;
686 ch_state = 0;
687 break;
688
689 case 4: /* After "\n.\r" (\n written, rest not) */
690 if (ch == '\n') return END_DOT;
691 message_size += 2;
692 body_linecount++;
693 if (fputs(".\n", fout) == EOF) return END_WERROR;
694 if (ch == '\r') { ch_state = 2; continue; }
695 ch_state = 0;
696 break;
697 }
698
699 linelength++;
700 if (fputc(ch, fout) == EOF) return END_WERROR;
701 if (++message_size > thismessage_size_limit) return END_SIZE;
702 }
703
704 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
705 the message ends with a newline, and we must also write any characters that
706 were saved up while testing for an ending dot. */
707
708 if (ch_state != 1)
709 {
710 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
711 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
712 message_size += Ustrlen(ends[ch_state]);
713 body_linecount++;
714 }
715
716 return END_EOF;
717 }
718
719
720
721
722 /*************************************************
723 * Read data portion of an SMTP message *
724 *************************************************/
725
726 /* This function is called to read the remainder of an SMTP message (after the
727 headers), or to skip over it when an error has occurred. In this case, the
728 output file is passed as NULL.
729
730 If any line begins with a dot, that character is skipped. The input should only
731 be successfully terminated by CR LF . CR LF unless it is local (non-network)
732 SMTP, in which case the CRs are optional, but...
733
734 FUDGE: It seems that sites on the net send out messages with just LF
735 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
736 we make the CRs optional in all cases.
737
738 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
739 well, so that there are no CRs in spooled messages. However, the message
740 terminating dot is not recognized between two bare CRs.
741
742 Arguments:
743 fout a FILE to which to write the message; NULL if skipping
744
745 Returns: One of the END_xxx values indicating why it stopped reading
746 */
747
748 static int
749 read_message_data_smtp(FILE *fout)
750 {
751 int ch_state = 0;
752 int ch;
753 register int linelength = 0;
754
755 while ((ch = (receive_getc)()) != EOF)
756 {
757 if (ch == 0) body_zerocount++;
758 switch (ch_state)
759 {
760 case 0: /* After LF or CRLF */
761 if (ch == '.')
762 {
763 ch_state = 3;
764 continue; /* Don't ever write . after LF */
765 }
766 ch_state = 1;
767
768 /* Else fall through to handle as normal uschar. */
769
770 case 1: /* Normal state */
771 if (ch == '\n')
772 {
773 ch_state = 0;
774 body_linecount++;
775 if (linelength > max_received_linelength)
776 max_received_linelength = linelength;
777 linelength = -1;
778 }
779 else if (ch == '\r')
780 {
781 ch_state = 2;
782 continue;
783 }
784 break;
785
786 case 2: /* After (unwritten) CR */
787 body_linecount++;
788 if (linelength > max_received_linelength)
789 max_received_linelength = linelength;
790 linelength = -1;
791 if (ch == '\n')
792 {
793 ch_state = 0;
794 }
795 else
796 {
797 message_size++;
798 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
799 (void) cutthrough_put_nl();
800 if (ch != '\r') ch_state = 1; else continue;
801 }
802 break;
803
804 case 3: /* After [CR] LF . */
805 if (ch == '\n')
806 return END_DOT;
807 if (ch == '\r')
808 {
809 ch_state = 4;
810 continue;
811 }
812 ch_state = 1; /* The dot itself is removed */
813 break;
814
815 case 4: /* After [CR] LF . CR */
816 if (ch == '\n') return END_DOT;
817 message_size++;
818 body_linecount++;
819 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
820 (void) cutthrough_put_nl();
821 if (ch == '\r')
822 {
823 ch_state = 2;
824 continue;
825 }
826 ch_state = 1;
827 break;
828 }
829
830 /* Add the character to the spool file, unless skipping; then loop for the
831 next. */
832
833 message_size++;
834 linelength++;
835 if (fout != NULL)
836 {
837 if (fputc(ch, fout) == EOF) return END_WERROR;
838 if (message_size > thismessage_size_limit) return END_SIZE;
839 }
840 if(ch == '\n')
841 (void) cutthrough_put_nl();
842 else
843 {
844 uschar c= ch;
845 (void) cutthrough_puts(&c, 1);
846 }
847 }
848
849 /* Fall through here if EOF encountered. This indicates some kind of error,
850 since a correct message is terminated by [CR] LF . [CR] LF. */
851
852 return END_EOF;
853 }
854
855
856
857
858 /*************************************************
859 * Swallow SMTP message *
860 *************************************************/
861
862 /* This function is called when there has been some kind of error while reading
863 an SMTP message, and the remaining data may need to be swallowed. It is global
864 because it is called from smtp_closedown() to shut down an incoming call
865 tidily.
866
867 Argument: a FILE from which to read the message
868 Returns: nothing
869 */
870
871 void
872 receive_swallow_smtp(void)
873 {
874 if (message_ended >= END_NOTENDED)
875 message_ended = read_message_data_smtp(NULL);
876 }
877
878
879
880 /*************************************************
881 * Handle lost SMTP connection *
882 *************************************************/
883
884 /* This function logs connection loss incidents and generates an appropriate
885 SMTP response.
886
887 Argument: additional data for the message
888 Returns: the SMTP response
889 */
890
891 static uschar *
892 handle_lost_connection(uschar *s)
893 {
894 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
895 "%s lost while reading message data%s", smtp_get_connection_info(), s);
896 return US"421 Lost incoming connection";
897 }
898
899
900
901
902 /*************************************************
903 * Handle a non-smtp reception error *
904 *************************************************/
905
906 /* This function is called for various errors during the reception of non-SMTP
907 messages. It either sends a message to the sender of the problem message, or it
908 writes to the standard error stream.
909
910 Arguments:
911 errcode code for moan_to_sender(), identifying the error
912 text1 first message text, passed to moan_to_sender()
913 text2 second message text, used only for stderrr
914 error_rc code to pass to exim_exit if no problem
915 f FILE containing body of message (may be stdin)
916 hptr pointer to instore headers or NULL
917
918 Returns: calls exim_exit(), which does not return
919 */
920
921 static void
922 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
923 FILE *f, header_line *hptr)
924 {
925 if (error_handling == ERRORS_SENDER)
926 {
927 error_block eblock;
928 eblock.next = NULL;
929 eblock.text1 = text1;
930 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
931 error_rc = EXIT_FAILURE;
932 }
933 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
934 (void)fclose(f);
935 exim_exit(error_rc);
936 }
937
938
939
940 /*************************************************
941 * Add header lines set up by ACL *
942 *************************************************/
943
944 /* This function is called to add the header lines that were set up by
945 statements in an ACL to the list of headers in memory. It is done in two stages
946 like this, because when the ACL for RCPT is running, the other headers have not
947 yet been received. This function is called twice; once just before running the
948 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
949 are visible to the DATA ACL.
950
951 Originally these header lines were added at the end. Now there is support for
952 three different places: top, bottom, and after the Received: header(s). There
953 will always be at least one Received: header, even if it is marked deleted, and
954 even if something else has been put in front of it.
955
956 Arguments:
957 acl_name text to identify which ACL
958
959 Returns: nothing
960 */
961
962 static void
963 add_acl_headers(uschar *acl_name)
964 {
965 header_line *h, *next;
966 header_line *last_received = NULL;
967
968 if (acl_removed_headers != NULL)
969 {
970 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
971
972 for (h = header_list; h != NULL; h = h->next)
973 {
974 uschar *list;
975 BOOL include_header;
976
977 if (h->type == htype_old) continue;
978
979 include_header = TRUE;
980 list = acl_removed_headers;
981
982 int sep = ':'; /* This is specified as a colon-separated list */
983 uschar *s;
984 uschar buffer[128];
985 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer)))
986 != NULL)
987 {
988 int len = Ustrlen(s);
989 if (header_testname(h, s, len, FALSE))
990 {
991 h->type = htype_old;
992 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
993 }
994 }
995 }
996 acl_removed_headers = NULL;
997 DEBUG(D_receive|D_acl) debug_printf(">>\n");
998 }
999
1000 if (acl_added_headers == NULL) return;
1001 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1002
1003 for (h = acl_added_headers; h != NULL; h = next)
1004 {
1005 next = h->next;
1006
1007 switch(h->type)
1008 {
1009 case htype_add_top:
1010 h->next = header_list;
1011 header_list = h;
1012 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1013 break;
1014
1015 case htype_add_rec:
1016 if (last_received == NULL)
1017 {
1018 last_received = header_list;
1019 while (!header_testname(last_received, US"Received", 8, FALSE))
1020 last_received = last_received->next;
1021 while (last_received->next != NULL &&
1022 header_testname(last_received->next, US"Received", 8, FALSE))
1023 last_received = last_received->next;
1024 }
1025 h->next = last_received->next;
1026 last_received->next = h;
1027 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1028 break;
1029
1030 case htype_add_rfc:
1031 /* add header before any header which is NOT Received: or Resent- */
1032 last_received = header_list;
1033 while ( (last_received->next != NULL) &&
1034 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1035 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1036 last_received = last_received->next;
1037 /* last_received now points to the last Received: or Resent-* header
1038 in an uninterrupted chain of those header types (seen from the beginning
1039 of all headers. Our current header must follow it. */
1040 h->next = last_received->next;
1041 last_received->next = h;
1042 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1043 break;
1044
1045 default:
1046 h->next = NULL;
1047 header_last->next = h;
1048 break;
1049 }
1050
1051 if (h->next == NULL) header_last = h;
1052
1053 /* Check for one of the known header types (From:, To:, etc.) though in
1054 practice most added headers are going to be "other". Lower case
1055 identification letters are never stored with the header; they are used
1056 for existence tests when messages are received. So discard any lower case
1057 flag values. */
1058
1059 h->type = header_checkname(h, FALSE);
1060 if (h->type >= 'a') h->type = htype_other;
1061
1062 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1063 }
1064
1065 acl_added_headers = NULL;
1066 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1067 }
1068
1069
1070
1071 /*************************************************
1072 * Add host information for log line *
1073 *************************************************/
1074
1075 /* Called for acceptance and rejecting log lines. This adds information about
1076 the calling host to a string that is being built dynamically.
1077
1078 Arguments:
1079 s the dynamic string
1080 sizeptr points to the size variable
1081 ptrptr points to the pointer variable
1082
1083 Returns: the extended string
1084 */
1085
1086 static uschar *
1087 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1088 {
1089 if (sender_fullhost != NULL)
1090 {
1091 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1092 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1093 interface_address != NULL)
1094 {
1095 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1096 interface_port);
1097 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1098 }
1099 }
1100 if (sender_ident != NULL)
1101 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1102 if (received_protocol != NULL)
1103 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1104 return s;
1105 }
1106
1107
1108
1109 #ifdef WITH_CONTENT_SCAN
1110
1111 /*************************************************
1112 * Run the MIME ACL on a message *
1113 *************************************************/
1114
1115 /* This code is in a subroutine so that it can be used for both SMTP
1116 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1117
1118 Arguments:
1119 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1120 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1121 smtp_reply_ptr Where SMTP reply is being built
1122 blackholed_by_ptr Where "blackholed by" message is being built
1123
1124 Returns: TRUE to carry on; FALSE to abandon the message
1125 */
1126
1127 static BOOL
1128 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1129 uschar **blackholed_by_ptr)
1130 {
1131 FILE *mbox_file;
1132 uschar rfc822_file_path[2048];
1133 unsigned long mbox_size;
1134 header_line *my_headerlist;
1135 uschar *user_msg, *log_msg;
1136 int mime_part_count_buffer = -1;
1137 int rc = OK;
1138
1139 memset(CS rfc822_file_path,0,2048);
1140
1141 /* check if it is a MIME message */
1142 my_headerlist = header_list;
1143 while (my_headerlist != NULL)
1144 {
1145 /* skip deleted headers */
1146 if (my_headerlist->type == '*')
1147 {
1148 my_headerlist = my_headerlist->next;
1149 continue;
1150 }
1151 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1152 {
1153 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1154 goto DO_MIME_ACL;
1155 }
1156 my_headerlist = my_headerlist->next;
1157 }
1158
1159 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1160 return TRUE;
1161
1162 DO_MIME_ACL:
1163 /* make sure the eml mbox file is spooled up */
1164 mbox_file = spool_mbox(&mbox_size, NULL);
1165 if (mbox_file == NULL) {
1166 /* error while spooling */
1167 log_write(0, LOG_MAIN|LOG_PANIC,
1168 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1169 Uunlink(spool_name);
1170 unspool_mbox();
1171 #ifdef EXPERIMENTAL_DCC
1172 dcc_ok = 0;
1173 #endif
1174 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1175 message_id[0] = 0; /* Indicate no message accepted */
1176 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1177 return FALSE; /* Indicate skip to end of receive function */
1178 };
1179
1180 mime_is_rfc822 = 0;
1181
1182 MIME_ACL_CHECK:
1183 mime_part_count = -1;
1184 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1185 (void)fclose(mbox_file);
1186
1187 if (Ustrlen(rfc822_file_path) > 0)
1188 {
1189 mime_part_count = mime_part_count_buffer;
1190
1191 if (unlink(CS rfc822_file_path) == -1)
1192 {
1193 log_write(0, LOG_PANIC,
1194 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1195 goto END_MIME_ACL;
1196 }
1197 }
1198
1199 /* check if we must check any message/rfc822 attachments */
1200 if (rc == OK)
1201 {
1202 uschar temp_path[1024];
1203 int n;
1204 struct dirent *entry;
1205 DIR *tempdir;
1206
1207 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1208 message_id);
1209
1210 tempdir = opendir(CS temp_path);
1211 n = 0;
1212 do
1213 {
1214 entry = readdir(tempdir);
1215 if (entry == NULL) break;
1216 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1217 {
1218 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1219 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1220 break;
1221 }
1222 } while (1);
1223 closedir(tempdir);
1224
1225 if (entry != NULL)
1226 {
1227 mbox_file = Ufopen(rfc822_file_path,"rb");
1228 if (mbox_file == NULL)
1229 {
1230 log_write(0, LOG_PANIC,
1231 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1232 unlink(CS rfc822_file_path);
1233 goto END_MIME_ACL;
1234 }
1235 /* set RFC822 expansion variable */
1236 mime_is_rfc822 = 1;
1237 mime_part_count_buffer = mime_part_count;
1238 goto MIME_ACL_CHECK;
1239 }
1240 }
1241
1242 END_MIME_ACL:
1243 add_acl_headers(US"MIME");
1244 if (rc == DISCARD)
1245 {
1246 recipients_count = 0;
1247 *blackholed_by_ptr = US"MIME ACL";
1248 }
1249 else if (rc != OK)
1250 {
1251 Uunlink(spool_name);
1252 unspool_mbox();
1253 #ifdef EXPERIMENTAL_DCC
1254 dcc_ok = 0;
1255 #endif
1256 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1257 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1258 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1259 message_id[0] = 0; /* Indicate no message accepted */
1260 return FALSE; /* Cause skip to end of receive function */
1261 }
1262
1263 return TRUE;
1264 }
1265
1266 #endif /* WITH_CONTENT_SCAN */
1267
1268
1269
1270 void
1271 received_header_gen(void)
1272 {
1273 uschar *received;
1274 uschar *timestamp;
1275 header_line *received_header= header_list;
1276
1277 timestamp = expand_string(US"${tod_full}");
1278 if (recipients_count == 1) received_for = recipients_list[0].address;
1279 received = expand_string(received_header_text);
1280 received_for = NULL;
1281
1282 if (received == NULL)
1283 {
1284 if(spool_name[0] != 0)
1285 Uunlink(spool_name); /* Lose the data file */
1286 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1287 "(received_header_text) failed: %s", string_printing(received_header_text),
1288 expand_string_message);
1289 }
1290
1291 /* The first element on the header chain is reserved for the Received header,
1292 so all we have to do is fill in the text pointer, and set the type. However, if
1293 the result of the expansion is an empty string, we leave the header marked as
1294 "old" so as to refrain from adding a Received header. */
1295
1296 if (received[0] == 0)
1297 {
1298 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1299 received_header->type = htype_old;
1300 }
1301 else
1302 {
1303 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1304 received_header->type = htype_received;
1305 }
1306
1307 received_header->slen = Ustrlen(received_header->text);
1308
1309 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1310 received_header->type, received_header->text);
1311 }
1312
1313
1314
1315 /*************************************************
1316 * Receive message *
1317 *************************************************/
1318
1319 /* Receive a message on the given input, and put it into a pair of spool files.
1320 Either a non-null list of recipients, or the extract flag will be true, or
1321 both. The flag sender_local is true for locally generated messages. The flag
1322 submission_mode is true if an ACL has obeyed "control = submission". The flag
1323 suppress_local_fixups is true if an ACL has obeyed "control =
1324 suppress_local_fixups" or -G was passed on the command-line.
1325 The flag smtp_input is true if the message is to be
1326 handled using SMTP conventions about termination and lines starting with dots.
1327 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1328
1329 If a message was successfully read, message_id[0] will be non-zero.
1330
1331 The general actions of this function are:
1332
1333 . Read the headers of the message (if any) into a chain of store
1334 blocks.
1335
1336 . If there is a "sender:" header and the message is locally originated,
1337 throw it away, unless the caller is trusted, or unless
1338 active_local_sender_retain is set - which can only happen if
1339 active_local_from_check is false.
1340
1341 . If recipients are to be extracted from the message, build the
1342 recipients list from the headers, removing any that were on the
1343 original recipients list (unless extract_addresses_remove_arguments is
1344 false), and at the same time, remove any bcc header that may be present.
1345
1346 . Get the spool file for the data, sort out its unique name, open
1347 and lock it (but don't give it the name yet).
1348
1349 . Generate a "Message-Id" header if the message doesn't have one, for
1350 locally-originated messages.
1351
1352 . Generate a "Received" header.
1353
1354 . Ensure the recipients list is fully qualified and rewritten if necessary.
1355
1356 . If there are any rewriting rules, apply them to the sender address
1357 and also to the headers.
1358
1359 . If there is no from: header, generate one, for locally-generated messages
1360 and messages in "submission mode" only.
1361
1362 . If the sender is local, check that from: is correct, and if not, generate
1363 a Sender: header, unless message comes from a trusted caller, or this
1364 feature is disabled by active_local_from_check being false.
1365
1366 . If there is no "date" header, generate one, for locally-originated
1367 or submission mode messages only.
1368
1369 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1370 dot_ends mode, to the data file. Leave it open, to hold the lock.
1371
1372 . Write the envelope and the headers to a new file.
1373
1374 . Set the name for the header file; close it.
1375
1376 . Set the name for the data file; close it.
1377
1378 Because this function can potentially be called many times in a single
1379 SMTP connection, all store should be got by store_get(), so that it will be
1380 automatically retrieved after the message is accepted.
1381
1382 FUDGE: It seems that sites on the net send out messages with just LF
1383 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1384 we make the CRs optional in all cases.
1385
1386 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1387 new regime is now in place in which bare CRs in header lines are turned into LF
1388 followed by a space, so as not to terminate the header line.
1389
1390 February 2004: A bare LF in a header line in a message whose first line was
1391 terminated by CRLF is treated in the same way as a bare CR.
1392
1393 Arguments:
1394 extract_recip TRUE if recipients are to be extracted from the message's
1395 headers
1396
1397 Returns: TRUE there are more messages to be read (SMTP input)
1398 FALSE there are no more messages to be read (non-SMTP input
1399 or SMTP connection collapsed, or other failure)
1400
1401 When reading a message for filter testing, the returned value indicates
1402 whether the headers (which is all that is read) were terminated by '.' or
1403 not. */
1404
1405 BOOL
1406 receive_msg(BOOL extract_recip)
1407 {
1408 int i;
1409 int rc = FAIL;
1410 int msg_size = 0;
1411 int process_info_len = Ustrlen(process_info);
1412 int error_rc = (error_handling == ERRORS_SENDER)?
1413 errors_sender_rc : EXIT_FAILURE;
1414 int header_size = 256;
1415 int start, end, domain, size, sptr;
1416 int id_resolution;
1417 int had_zero = 0;
1418 int prevlines_length = 0;
1419
1420 register int ptr = 0;
1421
1422 BOOL contains_resent_headers = FALSE;
1423 BOOL extracted_ignored = FALSE;
1424 BOOL first_line_ended_crlf = TRUE_UNSET;
1425 BOOL smtp_yield = TRUE;
1426 BOOL yield = FALSE;
1427
1428 BOOL resents_exist = FALSE;
1429 uschar *resent_prefix = US"";
1430 uschar *blackholed_by = NULL;
1431 uschar *blackhole_log_msg = US"";
1432 int cutthrough_done = 0;
1433
1434 flock_t lock_data;
1435 error_block *bad_addresses = NULL;
1436
1437 uschar *frozen_by = NULL;
1438 uschar *queued_by = NULL;
1439
1440 uschar *errmsg, *s;
1441 struct stat statbuf;
1442
1443 /* Final message to give to SMTP caller, and messages from ACLs */
1444
1445 uschar *smtp_reply = NULL;
1446 uschar *user_msg, *log_msg;
1447
1448 /* Working header pointers */
1449
1450 header_line *h, *next;
1451
1452 /* Flags for noting the existence of certain headers (only one left) */
1453
1454 BOOL date_header_exists = FALSE;
1455
1456 /* Pointers to receive the addresses of headers whose contents we need. */
1457
1458 header_line *from_header = NULL;
1459 header_line *subject_header = NULL;
1460 header_line *msgid_header = NULL;
1461 header_line *received_header;
1462
1463 /* Variables for use when building the Received: header. */
1464
1465 uschar *timestamp;
1466 int tslen;
1467
1468 /* Release any open files that might have been cached while preparing to
1469 accept the message - e.g. by verifying addresses - because reading a message
1470 might take a fair bit of real time. */
1471
1472 search_tidyup();
1473
1474 /* Extracting the recipient list from an input file is incompatible with
1475 cutthrough delivery with the no-spool option. It shouldn't be possible
1476 to set up the combination, but just in case kill any ongoing connection. */
1477 if (extract_recip || !smtp_input)
1478 cancel_cutthrough_connection("not smtp input");
1479
1480 /* Initialize the chain of headers by setting up a place-holder for Received:
1481 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1482 pointing to the end of the chain to make adding headers simple. */
1483
1484 received_header = header_list = header_last = store_get(sizeof(header_line));
1485 header_list->next = NULL;
1486 header_list->type = htype_old;
1487 header_list->text = NULL;
1488 header_list->slen = 0;
1489
1490 /* Control block for the next header to be read. */
1491
1492 next = store_get(sizeof(header_line));
1493 next->text = store_get(header_size);
1494
1495 /* Initialize message id to be null (indicating no message read), and the
1496 header names list to be the normal list. Indicate there is no data file open
1497 yet, initialize the size and warning count, and deal with no size limit. */
1498
1499 message_id[0] = 0;
1500 data_file = NULL;
1501 data_fd = -1;
1502 spool_name[0] = 0;
1503 message_size = 0;
1504 warning_count = 0;
1505 received_count = 1; /* For the one we will add */
1506
1507 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1508
1509 /* While reading the message, the following counts are computed. */
1510
1511 message_linecount = body_linecount = body_zerocount =
1512 max_received_linelength = 0;
1513
1514 #ifndef DISABLE_DKIM
1515 /* Call into DKIM to set up the context. */
1516 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1517 #endif
1518
1519 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1520 ids, and fractions of a second are required. See the comments that precede the
1521 message id creation below. */
1522
1523 (void)gettimeofday(&message_id_tv, NULL);
1524
1525 /* For other uses of the received time we can operate with granularity of one
1526 second, and for that we use the global variable received_time. This is for
1527 things like ultimate message timeouts. */
1528
1529 received_time = message_id_tv.tv_sec;
1530
1531 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1532 happen in the smtp_getc() function when it refills its buffer. */
1533
1534 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1535
1536 /* If not SMTP input, timeout happens only if configured, and we just set a
1537 single timeout for the whole message. */
1538
1539 else if (receive_timeout > 0)
1540 {
1541 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1542 alarm(receive_timeout);
1543 }
1544
1545 /* SIGTERM and SIGINT are caught always. */
1546
1547 signal(SIGTERM, data_sigterm_sigint_handler);
1548 signal(SIGINT, data_sigterm_sigint_handler);
1549
1550 /* Header lines in messages are not supposed to be very long, though when
1551 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1552 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1553 storing the header, and extend this as necessary using string_cat().
1554
1555 To cope with total lunacies, impose an upper limit on the length of the header
1556 section of the message, as otherwise the store will fill up. We must also cope
1557 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1558 Folded header lines are joined into one string, leaving the '\n' characters
1559 inside them, so that writing them out reproduces the input.
1560
1561 Loop for each character of each header; the next structure for chaining the
1562 header is set up already, with ptr the offset of the next character in
1563 next->text. */
1564
1565 for (;;)
1566 {
1567 int ch = (receive_getc)();
1568
1569 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1570 SMTP must have a correct "." terminator. */
1571
1572 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1573 {
1574 smtp_reply = handle_lost_connection(US" (header)");
1575 smtp_yield = FALSE;
1576 goto TIDYUP; /* Skip to end of function */
1577 }
1578
1579 /* See if we are at the current header's size limit - there must be at least
1580 four bytes left. This allows for the new character plus a zero, plus two for
1581 extra insertions when we are playing games with dots and carriage returns. If
1582 we are at the limit, extend the text buffer. This could have been done
1583 automatically using string_cat() but because this is a tightish loop storing
1584 only one character at a time, we choose to do it inline. Normally
1585 store_extend() will be able to extend the block; only at the end of a big
1586 store block will a copy be needed. To handle the case of very long headers
1587 (and sometimes lunatic messages can have ones that are 100s of K long) we
1588 call store_release() for strings that have been copied - if the string is at
1589 the start of a block (and therefore the only thing in it, because we aren't
1590 doing any other gets), the block gets freed. We can only do this because we
1591 know there are no other calls to store_get() going on. */
1592
1593 if (ptr >= header_size - 4)
1594 {
1595 int oldsize = header_size;
1596 /* header_size += 256; */
1597 header_size *= 2;
1598 if (!store_extend(next->text, oldsize, header_size))
1599 {
1600 uschar *newtext = store_get(header_size);
1601 memcpy(newtext, next->text, ptr);
1602 store_release(next->text);
1603 next->text = newtext;
1604 }
1605 }
1606
1607 /* Cope with receiving a binary zero. There is dispute about whether
1608 these should be allowed in RFC 822 messages. The middle view is that they
1609 should not be allowed in headers, at least. Exim takes this attitude at
1610 the moment. We can't just stomp on them here, because we don't know that
1611 this line is a header yet. Set a flag to cause scanning later. */
1612
1613 if (ch == 0) had_zero++;
1614
1615 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1616 those from data files use just LF. Treat LF in local SMTP input as a
1617 terminator too. Treat EOF as a line terminator always. */
1618
1619 if (ch == EOF) goto EOL;
1620
1621 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1622 other MTAs accept this. We are therefore forced into this "liberalisation"
1623 too, so we accept LF as a line terminator whatever the source of the message.
1624 However, if the first line of the message ended with a CRLF, we treat a bare
1625 LF specially by inserting a white space after it to ensure that the header
1626 line is not terminated. */
1627
1628 if (ch == '\n')
1629 {
1630 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1631 else if (first_line_ended_crlf) receive_ungetc(' ');
1632 goto EOL;
1633 }
1634
1635 /* This is not the end of the line. If this is SMTP input and this is
1636 the first character in the line and it is a "." character, ignore it.
1637 This implements the dot-doubling rule, though header lines starting with
1638 dots aren't exactly common. They are legal in RFC 822, though. If the
1639 following is CRLF or LF, this is the line that that terminates the
1640 entire message. We set message_ended to indicate this has happened (to
1641 prevent further reading), and break out of the loop, having freed the
1642 empty header, and set next = NULL to indicate no data line. */
1643
1644 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1645 {
1646 ch = (receive_getc)();
1647 if (ch == '\r')
1648 {
1649 ch = (receive_getc)();
1650 if (ch != '\n')
1651 {
1652 receive_ungetc(ch);
1653 ch = '\r'; /* Revert to CR */
1654 }
1655 }
1656 if (ch == '\n')
1657 {
1658 message_ended = END_DOT;
1659 store_reset(next);
1660 next = NULL;
1661 break; /* End character-reading loop */
1662 }
1663
1664 /* For non-SMTP input, the dot at the start of the line was really a data
1665 character. What is now in ch is the following character. We guaranteed
1666 enough space for this above. */
1667
1668 if (!smtp_input)
1669 {
1670 next->text[ptr++] = '.';
1671 message_size++;
1672 }
1673 }
1674
1675 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1676 remember this case if this is the first line ending. */
1677
1678 if (ch == '\r')
1679 {
1680 ch = (receive_getc)();
1681 if (ch == '\n')
1682 {
1683 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1684 goto EOL;
1685 }
1686
1687 /* Otherwise, put back the character after CR, and turn the bare CR
1688 into LF SP. */
1689
1690 ch = (receive_ungetc)(ch);
1691 next->text[ptr++] = '\n';
1692 message_size++;
1693 ch = ' ';
1694 }
1695
1696 /* We have a data character for the header line. */
1697
1698 next->text[ptr++] = ch; /* Add to buffer */
1699 message_size++; /* Total message size so far */
1700
1701 /* Handle failure due to a humungously long header section. The >= allows
1702 for the terminating \n. Add what we have so far onto the headers list so
1703 that it gets reflected in any error message, and back up the just-read
1704 character. */
1705
1706 if (message_size >= header_maxsize)
1707 {
1708 next->text[ptr] = 0;
1709 next->slen = ptr;
1710 next->type = htype_other;
1711 next->next = NULL;
1712 header_last->next = next;
1713 header_last = next;
1714
1715 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1716 "%s (more than %d characters): message abandoned",
1717 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1718
1719 if (smtp_input)
1720 {
1721 smtp_reply = US"552 Message header is ridiculously long";
1722 receive_swallow_smtp();
1723 goto TIDYUP; /* Skip to end of function */
1724 }
1725
1726 else
1727 {
1728 give_local_error(ERRMESS_VLONGHEADER,
1729 string_sprintf("message header longer than %d characters received: "
1730 "message not accepted", header_maxsize), US"", error_rc, stdin,
1731 header_list->next);
1732 /* Does not return */
1733 }
1734 }
1735
1736 continue; /* With next input character */
1737
1738 /* End of header line reached */
1739
1740 EOL:
1741
1742 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1743
1744 receive_linecount++;
1745 message_linecount++;
1746
1747 /* Keep track of maximum line length */
1748
1749 if (ptr - prevlines_length > max_received_linelength)
1750 max_received_linelength = ptr - prevlines_length;
1751 prevlines_length = ptr + 1;
1752
1753 /* Now put in the terminating newline. There is always space for
1754 at least two more characters. */
1755
1756 next->text[ptr++] = '\n';
1757 message_size++;
1758
1759 /* A blank line signals the end of the headers; release the unwanted
1760 space and set next to NULL to indicate this. */
1761
1762 if (ptr == 1)
1763 {
1764 store_reset(next);
1765 next = NULL;
1766 break;
1767 }
1768
1769 /* There is data in the line; see if the next input character is a
1770 whitespace character. If it is, we have a continuation of this header line.
1771 There is always space for at least one character at this point. */
1772
1773 if (ch != EOF)
1774 {
1775 int nextch = (receive_getc)();
1776 if (nextch == ' ' || nextch == '\t')
1777 {
1778 next->text[ptr++] = nextch;
1779 message_size++;
1780 continue; /* Iterate the loop */
1781 }
1782 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1783 else ch = EOF; /* Cause main loop to exit at end */
1784 }
1785
1786 /* We have got to the real line end. Terminate the string and release store
1787 beyond it. If it turns out to be a real header, internal binary zeros will
1788 be squashed later. */
1789
1790 next->text[ptr] = 0;
1791 next->slen = ptr;
1792 store_reset(next->text + ptr + 1);
1793
1794 /* Check the running total size against the overall message size limit. We
1795 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1796 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1797 headers - the code to read the body will then also hit the buffer. */
1798
1799 if (message_size > thismessage_size_limit) break;
1800
1801 /* A line that is not syntactically correct for a header also marks
1802 the end of the headers. In this case, we leave next containing the
1803 first data line. This might actually be several lines because of the
1804 continuation logic applied above, but that doesn't matter.
1805
1806 It turns out that smail, and presumably sendmail, accept leading lines
1807 of the form
1808
1809 From ph10 Fri Jan 5 12:35 GMT 1996
1810
1811 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1812 find any documentation of this, but for compatibility it had better be
1813 accepted. Exim restricts it to the case of non-smtp messages, and
1814 treats it as an alternative to the -f command line option. Thus it is
1815 ignored except for trusted users or filter testing. Otherwise it is taken
1816 as the sender address, unless -f was used (sendmail compatibility).
1817
1818 It further turns out that some UUCPs generate the From_line in a different
1819 format, e.g.
1820
1821 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1822
1823 The regex for matching these things is now capable of recognizing both
1824 formats (including 2- and 4-digit years in the latter). In fact, the regex
1825 is now configurable, as is the expansion string to fish out the sender.
1826
1827 Even further on it has been discovered that some broken clients send
1828 these lines in SMTP messages. There is now an option to ignore them from
1829 specified hosts or networks. Sigh. */
1830
1831 if (header_last == header_list &&
1832 (!smtp_input
1833 ||
1834 (sender_host_address != NULL &&
1835 verify_check_host(&ignore_fromline_hosts) == OK)
1836 ||
1837 (sender_host_address == NULL && ignore_fromline_local)
1838 ) &&
1839 regex_match_and_setup(regex_From, next->text, 0, -1))
1840 {
1841 if (!sender_address_forced)
1842 {
1843 uschar *uucp_sender = expand_string(uucp_from_sender);
1844 if (uucp_sender == NULL)
1845 {
1846 log_write(0, LOG_MAIN|LOG_PANIC,
1847 "expansion of \"%s\" failed after matching "
1848 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1849 }
1850 else
1851 {
1852 int start, end, domain;
1853 uschar *errmess;
1854 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1855 &start, &end, &domain, TRUE);
1856 if (newsender != NULL)
1857 {
1858 if (domain == 0 && newsender[0] != 0)
1859 newsender = rewrite_address_qualify(newsender, FALSE);
1860
1861 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1862 {
1863 sender_address = newsender;
1864
1865 if (trusted_caller || filter_test != FTEST_NONE)
1866 {
1867 authenticated_sender = NULL;
1868 originator_name = US"";
1869 sender_local = FALSE;
1870 }
1871
1872 if (filter_test != FTEST_NONE)
1873 printf("Sender taken from \"From \" line\n");
1874 }
1875 }
1876 }
1877 }
1878 }
1879
1880 /* Not a leading "From " line. Check to see if it is a valid header line.
1881 Header names may contain any non-control characters except space and colon,
1882 amazingly. */
1883
1884 else
1885 {
1886 uschar *p = next->text;
1887
1888 /* If not a valid header line, break from the header reading loop, leaving
1889 next != NULL, indicating that it holds the first line of the body. */
1890
1891 if (isspace(*p)) break;
1892 while (mac_isgraph(*p) && *p != ':') p++;
1893 while (isspace(*p)) p++;
1894 if (*p != ':')
1895 {
1896 body_zerocount = had_zero;
1897 break;
1898 }
1899
1900 /* We have a valid header line. If there were any binary zeroes in
1901 the line, stomp on them here. */
1902
1903 if (had_zero > 0)
1904 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1905
1906 /* It is perfectly legal to have an empty continuation line
1907 at the end of a header, but it is confusing to humans
1908 looking at such messages, since it looks like a blank line.
1909 Reduce confusion by removing redundant white space at the
1910 end. We know that there is at least one printing character
1911 (the ':' tested for above) so there is no danger of running
1912 off the end. */
1913
1914 p = next->text + ptr - 2;
1915 for (;;)
1916 {
1917 while (*p == ' ' || *p == '\t') p--;
1918 if (*p != '\n') break;
1919 ptr = (p--) - next->text + 1;
1920 message_size -= next->slen - ptr;
1921 next->text[ptr] = 0;
1922 next->slen = ptr;
1923 }
1924
1925 /* Add the header to the chain */
1926
1927 next->type = htype_other;
1928 next->next = NULL;
1929 header_last->next = next;
1930 header_last = next;
1931
1932 /* Check the limit for individual line lengths. This comes after adding to
1933 the chain so that the failing line is reflected if a bounce is generated
1934 (for a local message). */
1935
1936 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1937 {
1938 log_write(0, LOG_MAIN, "overlong message header line received from "
1939 "%s (more than %d characters): message abandoned",
1940 sender_host_unknown? sender_ident : sender_fullhost,
1941 header_line_maxsize);
1942
1943 if (smtp_input)
1944 {
1945 smtp_reply = US"552 A message header line is too long";
1946 receive_swallow_smtp();
1947 goto TIDYUP; /* Skip to end of function */
1948 }
1949
1950 else
1951 {
1952 give_local_error(ERRMESS_VLONGHDRLINE,
1953 string_sprintf("message header line longer than %d characters "
1954 "received: message not accepted", header_line_maxsize), US"",
1955 error_rc, stdin, header_list->next);
1956 /* Does not return */
1957 }
1958 }
1959
1960 /* Note if any resent- fields exist. */
1961
1962 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1963 {
1964 resents_exist = TRUE;
1965 resent_prefix = US"Resent-";
1966 }
1967 }
1968
1969 /* The line has been handled. If we have hit EOF, break out of the loop,
1970 indicating no pending data line. */
1971
1972 if (ch == EOF) { next = NULL; break; }
1973
1974 /* Set up for the next header */
1975
1976 header_size = 256;
1977 next = store_get(sizeof(header_line));
1978 next->text = store_get(header_size);
1979 ptr = 0;
1980 had_zero = 0;
1981 prevlines_length = 0;
1982 } /* Continue, starting to read the next header */
1983
1984 /* At this point, we have read all the headers into a data structure in main
1985 store. The first header is still the dummy placeholder for the Received: header
1986 we are going to generate a bit later on. If next != NULL, it contains the first
1987 data line - which terminated the headers before reaching a blank line (not the
1988 normal case). */
1989
1990 DEBUG(D_receive)
1991 {
1992 debug_printf(">>Headers received:\n");
1993 for (h = header_list->next; h != NULL; h = h->next)
1994 debug_printf("%s", h->text);
1995 debug_printf("\n");
1996 }
1997
1998 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1999 is dropped immediately after valid headers, the next thing we will see is EOF.
2000 We must test for this specially, as further down the reading of the data is
2001 skipped if already at EOF. */
2002
2003 if (smtp_input && (receive_feof)())
2004 {
2005 smtp_reply = handle_lost_connection(US" (after header)");
2006 smtp_yield = FALSE;
2007 goto TIDYUP; /* Skip to end of function */
2008 }
2009
2010 /* If this is a filter test run and no headers were read, output a warning
2011 in case there is a mistake in the test message. */
2012
2013 if (filter_test != FTEST_NONE && header_list->next == NULL)
2014 printf("Warning: no message headers read\n");
2015
2016
2017 /* Scan the headers to identify them. Some are merely marked for later
2018 processing; some are dealt with here. */
2019
2020 for (h = header_list->next; h != NULL; h = h->next)
2021 {
2022 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2023 if (is_resent) contains_resent_headers = TRUE;
2024
2025 switch (header_checkname(h, is_resent))
2026 {
2027 case htype_bcc:
2028 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2029 break;
2030
2031 case htype_cc:
2032 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2033 break;
2034
2035 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2036
2037 case htype_date:
2038 if (!resents_exist || is_resent) date_header_exists = TRUE;
2039 break;
2040
2041 /* Same comments as about Return-Path: below. */
2042
2043 case htype_delivery_date:
2044 if (delivery_date_remove) h->type = htype_old;
2045 break;
2046
2047 /* Same comments as about Return-Path: below. */
2048
2049 case htype_envelope_to:
2050 if (envelope_to_remove) h->type = htype_old;
2051 break;
2052
2053 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2054 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2055 header consists of just the login id of the user who called Exim, rewrite
2056 it with the gecos field first. Apply this rule to Resent-From: if there
2057 are resent- fields. */
2058
2059 case htype_from:
2060 h->type = htype_from;
2061 if (!resents_exist || is_resent)
2062 {
2063 from_header = h;
2064 if (!smtp_input)
2065 {
2066 int len;
2067 uschar *s = Ustrchr(h->text, ':') + 1;
2068 while (isspace(*s)) s++;
2069 len = h->slen - (s - h->text) - 1;
2070 if (Ustrlen(originator_login) == len &&
2071 strncmpic(s, originator_login, len) == 0)
2072 {
2073 uschar *name = is_resent? US"Resent-From" : US"From";
2074 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2075 originator_login, qualify_domain_sender);
2076 from_header = header_last;
2077 h->type = htype_old;
2078 DEBUG(D_receive|D_rewrite)
2079 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2080 }
2081 }
2082 }
2083 break;
2084
2085 /* Identify the Message-id: header for generating "in-reply-to" in the
2086 autoreply transport. For incoming logging, save any resent- value. In both
2087 cases, take just the first of any multiples. */
2088
2089 case htype_id:
2090 if (msgid_header == NULL && (!resents_exist || is_resent))
2091 {
2092 msgid_header = h;
2093 h->type = htype_id;
2094 }
2095 break;
2096
2097 /* Flag all Received: headers */
2098
2099 case htype_received:
2100 h->type = htype_received;
2101 received_count++;
2102 break;
2103
2104 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2105
2106 case htype_reply_to:
2107 h->type = htype_reply_to;
2108 break;
2109
2110 /* The Return-path: header is supposed to be added to messages when
2111 they leave the SMTP system. We shouldn't receive messages that already
2112 contain Return-path. However, since Exim generates Return-path: on
2113 local delivery, resent messages may well contain it. We therefore
2114 provide an option (which defaults on) to remove any Return-path: headers
2115 on input. Removal actually means flagging as "old", which prevents the
2116 header being transmitted with the message. */
2117
2118 case htype_return_path:
2119 if (return_path_remove) h->type = htype_old;
2120
2121 /* If we are testing a mail filter file, use the value of the
2122 Return-Path: header to set up the return_path variable, which is not
2123 otherwise set. However, remove any <> that surround the address
2124 because the variable doesn't have these. */
2125
2126 if (filter_test != FTEST_NONE)
2127 {
2128 uschar *start = h->text + 12;
2129 uschar *end = start + Ustrlen(start);
2130 while (isspace(*start)) start++;
2131 while (end > start && isspace(end[-1])) end--;
2132 if (*start == '<' && end[-1] == '>')
2133 {
2134 start++;
2135 end--;
2136 }
2137 return_path = string_copyn(start, end - start);
2138 printf("Return-path taken from \"Return-path:\" header line\n");
2139 }
2140 break;
2141
2142 /* If there is a "Sender:" header and the message is locally originated,
2143 and from an untrusted caller and suppress_local_fixups is not set, or if we
2144 are in submission mode for a remote message, mark it "old" so that it will
2145 not be transmitted with the message, unless active_local_sender_retain is
2146 set. (This can only be true if active_local_from_check is false.) If there
2147 are any resent- headers in the message, apply this rule to Resent-Sender:
2148 instead of Sender:. Messages with multiple resent- header sets cannot be
2149 tidily handled. (For this reason, at least one MUA - Pine - turns old
2150 resent- headers into X-resent- headers when resending, leaving just one
2151 set.) */
2152
2153 case htype_sender:
2154 h->type = ((!active_local_sender_retain &&
2155 (
2156 (sender_local && !trusted_caller && !suppress_local_fixups)
2157 || submission_mode
2158 )
2159 ) &&
2160 (!resents_exist||is_resent))?
2161 htype_old : htype_sender;
2162 break;
2163
2164 /* Remember the Subject: header for logging. There is no Resent-Subject */
2165
2166 case htype_subject:
2167 subject_header = h;
2168 break;
2169
2170 /* "To:" gets flagged, and the existence of a recipient header is noted,
2171 whether it's resent- or not. */
2172
2173 case htype_to:
2174 h->type = htype_to;
2175 /****
2176 to_or_cc_header_exists = TRUE;
2177 ****/
2178 break;
2179 }
2180 }
2181
2182 /* Extract recipients from the headers if that is required (the -t option).
2183 Note that this is documented as being done *before* any address rewriting takes
2184 place. There are two possibilities:
2185
2186 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2187 recipients already listed are to be REMOVED from the message. Smail 3 works
2188 like this. We need to build a non-recipients tree for that list, because in
2189 subsequent processing this data is held in a tree and that's what the
2190 spool_write_header() function expects. Make sure that non-recipient addresses
2191 are fully qualified and rewritten if necessary.
2192
2193 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2194 those in the command line arguments (and it is rumoured some other MTAs do
2195 this). Therefore, there is an option to make Exim behave this way.
2196
2197 *** Notes on "Resent-" header lines ***
2198
2199 The presence of resent-headers in the message makes -t horribly ambiguous.
2200 Experiments with sendmail showed that it uses recipients for all resent-
2201 headers, totally ignoring the concept of "sets of resent- headers" as described
2202 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2203 with all the addresses in one instance of each header.
2204
2205 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2206 error for -t if there were resent- headers in the message. However, after a
2207 discussion on the mailing list, I've learned that there are MUAs that use
2208 resent- headers with -t, and also that the stuff about sets of resent- headers
2209 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2210 message with -t and resent- header lines makes sure that only *its* resent-
2211 headers are present; previous ones are often renamed as X-resent- for example.
2212
2213 Consequently, Exim has been changed so that, if any resent- header lines are
2214 present, the recipients are taken from all of the appropriate resent- lines,
2215 and not from the ordinary To:, Cc:, etc. */
2216
2217 if (extract_recip)
2218 {
2219 int rcount = 0;
2220 error_block **bnext = &bad_addresses;
2221
2222 if (extract_addresses_remove_arguments)
2223 {
2224 while (recipients_count-- > 0)
2225 {
2226 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2227 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2228 tree_add_nonrecipient(s);
2229 }
2230 recipients_list = NULL;
2231 recipients_count = recipients_list_max = 0;
2232 }
2233
2234 /* Now scan the headers */
2235
2236 for (h = header_list->next; h != NULL; h = h->next)
2237 {
2238 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2239 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2240 {
2241 uschar *s = Ustrchr(h->text, ':') + 1;
2242 while (isspace(*s)) s++;
2243
2244 parse_allow_group = TRUE; /* Allow address group syntax */
2245
2246 while (*s != 0)
2247 {
2248 uschar *ss = parse_find_address_end(s, FALSE);
2249 uschar *recipient, *errmess, *p, *pp;
2250 int start, end, domain;
2251
2252 /* Check on maximum */
2253
2254 if (recipients_max > 0 && ++rcount > recipients_max)
2255 {
2256 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2257 US"message rejected: ", error_rc, stdin, NULL);
2258 /* Does not return */
2259 }
2260
2261 /* Make a copy of the address, and remove any internal newlines. These
2262 may be present as a result of continuations of the header line. The
2263 white space that follows the newline must not be removed - it is part
2264 of the header. */
2265
2266 pp = recipient = store_get(ss - s + 1);
2267 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2268 *pp = 0;
2269 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2270 &domain, FALSE);
2271
2272 /* Keep a list of all the bad addresses so we can send a single
2273 error message at the end. However, an empty address is not an error;
2274 just ignore it. This can come from an empty group list like
2275
2276 To: Recipients of list:;
2277
2278 If there are no recipients at all, an error will occur later. */
2279
2280 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2281 {
2282 int len = Ustrlen(s);
2283 error_block *b = store_get(sizeof(error_block));
2284 while (len > 0 && isspace(s[len-1])) len--;
2285 b->next = NULL;
2286 b->text1 = string_printing(string_copyn(s, len));
2287 b->text2 = errmess;
2288 *bnext = b;
2289 bnext = &(b->next);
2290 }
2291
2292 /* If the recipient is already in the nonrecipients tree, it must
2293 have appeared on the command line with the option extract_addresses_
2294 remove_arguments set. Do not add it to the recipients, and keep a note
2295 that this has happened, in order to give a better error if there are
2296 no recipients left. */
2297
2298 else if (recipient != NULL)
2299 {
2300 if (tree_search(tree_nonrecipients, recipient) == NULL)
2301 receive_add_recipient(recipient, -1);
2302 else
2303 extracted_ignored = TRUE;
2304 }
2305
2306 /* Move on past this address */
2307
2308 s = ss + (*ss? 1:0);
2309 while (isspace(*s)) s++;
2310 } /* Next address */
2311
2312 parse_allow_group = FALSE; /* Reset group syntax flags */
2313 parse_found_group = FALSE;
2314
2315 /* If this was the bcc: header, mark it "old", which means it
2316 will be kept on the spool, but not transmitted as part of the
2317 message. */
2318
2319 if (h->type == htype_bcc) h->type = htype_old;
2320 } /* For appropriate header line */
2321 } /* For each header line */
2322
2323 }
2324
2325 /* Now build the unique message id. This has changed several times over the
2326 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2327 Retaining all the history in the comment has become too unwieldy - read
2328 previous release sources if you want it.
2329
2330 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2331 The first part is the current time, in seconds. The second part is the current
2332 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2333 can hold a number in the range 0-3843. It used to be a computed sequence
2334 number, but is now the fractional component of the current time in units of
2335 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2336 received, Exim ensures that the timer has ticked at the appropriate level
2337 before proceeding, to avoid duplication if the pid happened to be re-used
2338 within the same time period. It seems likely that most messages will take at
2339 least half a millisecond to be received, so no delay will normally be
2340 necessary. At least for some time...
2341
2342 There is a modification when localhost_number is set. Formerly this was allowed
2343 to be as large as 255. Now it is restricted to the range 0-16, and the final
2344 component of the message id becomes (localhost_number * 200) + fractional time
2345 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2346
2347 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2348 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2349 still allows the tttttt field to hold a large enough number to last for some
2350 more decades, and the final two-digit field can hold numbers up to 1295, which
2351 is enough for milliseconds (instead of 1/2000 of a second).
2352
2353 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2354 pid, so it is probably safe because pids have to be positive. The
2355 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2356 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2357
2358 Note that string_base62() returns its data in a static storage block, so it
2359 must be copied before calling string_base62() again. It always returns exactly
2360 6 characters.
2361
2362 There doesn't seem to be anything in the RFC which requires a message id to
2363 start with a letter, but Smail was changed to ensure this. The external form of
2364 the message id (as supplied by string expansion) therefore starts with an
2365 additional leading 'E'. The spool file names do not include this leading
2366 letter and it is not used internally.
2367
2368 NOTE: If ever the format of message ids is changed, the regular expression for
2369 checking that a string is in this format must be updated in a corresponding
2370 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2371 must also be changed to reflect the correct string length. Then, of course,
2372 other programs that rely on the message id format will need updating too. */
2373
2374 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2375 message_id[6] = '-';
2376 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2377
2378 /* Deal with the case where the host number is set. The value of the number was
2379 checked when it was read, to ensure it isn't too big. The timing granularity is
2380 left in id_resolution so that an appropriate wait can be done after receiving
2381 the message, if necessary (we hope it won't be). */
2382
2383 if (host_number_string != NULL)
2384 {
2385 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2386 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2387 string_base62((long int)(
2388 host_number * (1000000/id_resolution) +
2389 message_id_tv.tv_usec/id_resolution)) + 4);
2390 }
2391
2392 /* Host number not set: final field is just the fractional time at an
2393 appropriate resolution. */
2394
2395 else
2396 {
2397 id_resolution = (BASE_62 == 62)? 500 : 1000;
2398 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2399 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2400 }
2401
2402 /* Add the current message id onto the current process info string if
2403 it will fit. */
2404
2405 (void)string_format(process_info + process_info_len,
2406 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2407
2408 /* If we are using multiple input directories, set up the one for this message
2409 to be the least significant base-62 digit of the time of arrival. Otherwise
2410 ensure that it is an empty string. */
2411
2412 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2413
2414 /* Now that we have the message-id, if there is no message-id: header, generate
2415 one, but only for local (without suppress_local_fixups) or submission mode
2416 messages. This can be user-configured if required, but we had better flatten
2417 any illegal characters therein. */
2418
2419 if (msgid_header == NULL &&
2420 ((sender_host_address == NULL && !suppress_local_fixups)
2421 || submission_mode))
2422 {
2423 uschar *p;
2424 uschar *id_text = US"";
2425 uschar *id_domain = primary_hostname;
2426
2427 /* Permit only letters, digits, dots, and hyphens in the domain */
2428
2429 if (message_id_domain != NULL)
2430 {
2431 uschar *new_id_domain = expand_string(message_id_domain);
2432 if (new_id_domain == NULL)
2433 {
2434 if (!expand_string_forcedfail)
2435 log_write(0, LOG_MAIN|LOG_PANIC,
2436 "expansion of \"%s\" (message_id_header_domain) "
2437 "failed: %s", message_id_domain, expand_string_message);
2438 }
2439 else if (*new_id_domain != 0)
2440 {
2441 id_domain = new_id_domain;
2442 for (p = id_domain; *p != 0; p++)
2443 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2444 }
2445 }
2446
2447 /* Permit all characters except controls and RFC 2822 specials in the
2448 additional text part. */
2449
2450 if (message_id_text != NULL)
2451 {
2452 uschar *new_id_text = expand_string(message_id_text);
2453 if (new_id_text == NULL)
2454 {
2455 if (!expand_string_forcedfail)
2456 log_write(0, LOG_MAIN|LOG_PANIC,
2457 "expansion of \"%s\" (message_id_header_text) "
2458 "failed: %s", message_id_text, expand_string_message);
2459 }
2460 else if (*new_id_text != 0)
2461 {
2462 id_text = new_id_text;
2463 for (p = id_text; *p != 0; p++)
2464 if (mac_iscntrl_or_special(*p)) *p = '-';
2465 }
2466 }
2467
2468 /* Add the header line
2469 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2470 * appended, to preserve classical expectations of header ordering. */
2471
2472 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2473 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2474 (*id_text == 0)? "" : ".", id_text, id_domain);
2475 }
2476
2477 /* If we are to log recipients, keep a copy of the raw ones before any possible
2478 rewriting. Must copy the count, because later ACLs and the local_scan()
2479 function may mess with the real recipients. */
2480
2481 if ((log_extra_selector & LX_received_recipients) != 0)
2482 {
2483 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2484 for (i = 0; i < recipients_count; i++)
2485 raw_recipients[i] = string_copy(recipients_list[i].address);
2486 raw_recipients_count = recipients_count;
2487 }
2488
2489 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2490 recipients will get here only if the conditions were right (allow_unqualified_
2491 recipient is TRUE). */
2492
2493 for (i = 0; i < recipients_count; i++)
2494 recipients_list[i].address =
2495 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2496 global_rewrite_rules, rewrite_existflags);
2497
2498 /* If there is no From: header, generate one for local (without
2499 suppress_local_fixups) or submission_mode messages. If there is no sender
2500 address, but the sender is local or this is a local delivery error, use the
2501 originator login. This shouldn't happen for genuine bounces, but might happen
2502 for autoreplies. The addition of From: must be done *before* checking for the
2503 possible addition of a Sender: header, because untrusted_set_sender allows an
2504 untrusted user to set anything in the envelope (which might then get info
2505 From:) but we still want to ensure a valid Sender: if it is required. */
2506
2507 if (from_header == NULL &&
2508 ((sender_host_address == NULL && !suppress_local_fixups)
2509 || submission_mode))
2510 {
2511 uschar *oname = US"";
2512
2513 /* Use the originator_name if this is a locally submitted message and the
2514 caller is not trusted. For trusted callers, use it only if -F was used to
2515 force its value or if we have a non-SMTP message for which -f was not used
2516 to set the sender. */
2517
2518 if (sender_host_address == NULL)
2519 {
2520 if (!trusted_caller || sender_name_forced ||
2521 (!smtp_input && !sender_address_forced))
2522 oname = originator_name;
2523 }
2524
2525 /* For non-locally submitted messages, the only time we use the originator
2526 name is when it was forced by the /name= option on control=submission. */
2527
2528 else
2529 {
2530 if (submission_name != NULL) oname = submission_name;
2531 }
2532
2533 /* Envelope sender is empty */
2534
2535 if (sender_address[0] == 0)
2536 {
2537 uschar *fromstart, *fromend;
2538
2539 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2540 oname, (oname[0] == 0)? "" : " <");
2541 fromend = (oname[0] == 0)? US"" : US">";
2542
2543 if (sender_local || local_error_message)
2544 {
2545 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2546 local_part_quote(originator_login), qualify_domain_sender,
2547 fromend);
2548 }
2549 else if (submission_mode && authenticated_id != NULL)
2550 {
2551 if (submission_domain == NULL)
2552 {
2553 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2554 local_part_quote(authenticated_id), qualify_domain_sender,
2555 fromend);
2556 }
2557 else if (submission_domain[0] == 0) /* empty => whole address set */
2558 {
2559 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2560 fromend);
2561 }
2562 else
2563 {
2564 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2565 local_part_quote(authenticated_id), submission_domain,
2566 fromend);
2567 }
2568 from_header = header_last; /* To get it checked for Sender: */
2569 }
2570 }
2571
2572 /* There is a non-null envelope sender. Build the header using the original
2573 sender address, before any rewriting that might have been done while
2574 verifying it. */
2575
2576 else
2577 {
2578 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2579 oname,
2580 (oname[0] == 0)? "" : " <",
2581 (sender_address_unrewritten == NULL)?
2582 sender_address : sender_address_unrewritten,
2583 (oname[0] == 0)? "" : ">");
2584
2585 from_header = header_last; /* To get it checked for Sender: */
2586 }
2587 }
2588
2589
2590 /* If the sender is local (without suppress_local_fixups), or if we are in
2591 submission mode and there is an authenticated_id, check that an existing From:
2592 is correct, and if not, generate a Sender: header, unless disabled. Any
2593 previously-existing Sender: header was removed above. Note that sender_local,
2594 as well as being TRUE if the caller of exim is not trusted, is also true if a
2595 trusted caller did not supply a -f argument for non-smtp input. To allow
2596 trusted callers to forge From: without supplying -f, we have to test explicitly
2597 here. If the From: header contains more than one address, then the call to
2598 parse_extract_address fails, and a Sender: header is inserted, as required. */
2599
2600 if (from_header != NULL &&
2601 (active_local_from_check &&
2602 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2603 (submission_mode && authenticated_id != NULL))
2604 ))
2605 {
2606 BOOL make_sender = TRUE;
2607 int start, end, domain;
2608 uschar *errmess;
2609 uschar *from_address =
2610 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2611 &start, &end, &domain, FALSE);
2612 uschar *generated_sender_address;
2613
2614 if (submission_mode)
2615 {
2616 if (submission_domain == NULL)
2617 {
2618 generated_sender_address = string_sprintf("%s@%s",
2619 local_part_quote(authenticated_id), qualify_domain_sender);
2620 }
2621 else if (submission_domain[0] == 0) /* empty => full address */
2622 {
2623 generated_sender_address = string_sprintf("%s",
2624 authenticated_id);
2625 }
2626 else
2627 {
2628 generated_sender_address = string_sprintf("%s@%s",
2629 local_part_quote(authenticated_id), submission_domain);
2630 }
2631 }
2632 else
2633 generated_sender_address = string_sprintf("%s@%s",
2634 local_part_quote(originator_login), qualify_domain_sender);
2635
2636 /* Remove permitted prefixes and suffixes from the local part of the From:
2637 address before doing the comparison with the generated sender. */
2638
2639 if (from_address != NULL)
2640 {
2641 int slen;
2642 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2643
2644 if (at != NULL) *at = 0;
2645 from_address += route_check_prefix(from_address, local_from_prefix);
2646 slen = route_check_suffix(from_address, local_from_suffix);
2647 if (slen > 0)
2648 {
2649 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2650 from_address += slen;
2651 }
2652 if (at != NULL) *at = '@';
2653
2654 if (strcmpic(generated_sender_address, from_address) == 0 ||
2655 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2656 make_sender = FALSE;
2657 }
2658
2659 /* We have to cause the Sender header to be rewritten if there are
2660 appropriate rewriting rules. */
2661
2662 if (make_sender)
2663 {
2664 if (submission_mode && submission_name == NULL)
2665 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2666 generated_sender_address);
2667 else
2668 header_add(htype_sender, "%sSender: %s <%s>\n",
2669 resent_prefix,
2670 submission_mode? submission_name : originator_name,
2671 generated_sender_address);
2672 }
2673
2674 /* Ensure that a non-null envelope sender address corresponds to the
2675 submission mode sender address. */
2676
2677 if (submission_mode && sender_address[0] != 0)
2678 {
2679 if (sender_address_unrewritten == NULL)
2680 sender_address_unrewritten = sender_address;
2681 sender_address = generated_sender_address;
2682 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2683 log_write(L_address_rewrite, LOG_MAIN,
2684 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2685 sender_address_unrewritten, generated_sender_address);
2686 }
2687 }
2688
2689
2690 /* If there are any rewriting rules, apply them to the sender address, unless
2691 it has already been rewritten as part of verification for SMTP input. */
2692
2693 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2694 sender_address[0] != 0)
2695 {
2696 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2697 global_rewrite_rules, rewrite_existflags);
2698 DEBUG(D_receive|D_rewrite)
2699 debug_printf("rewritten sender = %s\n", sender_address);
2700 }
2701
2702
2703 /* The headers must be run through rewrite_header(), because it ensures that
2704 addresses are fully qualified, as well as applying any rewriting rules that may
2705 exist.
2706
2707 Qualification of header addresses in a message from a remote host happens only
2708 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2709 appropriate. For local messages, qualification always happens, unless -bnq is
2710 used to explicitly suppress it. No rewriting is done for an unqualified address
2711 that is left untouched.
2712
2713 We start at the second header, skipping our own Received:. This rewriting is
2714 documented as happening *after* recipient addresses are taken from the headers
2715 by the -t command line option. An added Sender: gets rewritten here. */
2716
2717 for (h = header_list->next; h != NULL; h = h->next)
2718 {
2719 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2720 rewrite_existflags, TRUE);
2721 if (newh != NULL) h = newh;
2722 }
2723
2724
2725 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2726 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2727 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2728 exists, this applies to the set of resent- headers rather than the normal set.
2729
2730 The requirement for a recipient header has been removed in RFC 2822. At this
2731 point in the code, earlier versions of Exim added a To: header for locally
2732 submitted messages, and an empty Bcc: header for others. In the light of the
2733 changes in RFC 2822, this was dropped in November 2003. */
2734
2735
2736 /* If there is no date header, generate one if the message originates locally
2737 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2738 submission mode flag is set. Messages without Date: are not valid, but it seems
2739 to be more confusing if Exim adds one to all remotely-originated messages.
2740 As per Message-Id, we prepend if resending, else append.
2741 */
2742
2743 if (!date_header_exists &&
2744 ((sender_host_address == NULL && !suppress_local_fixups)
2745 || submission_mode))
2746 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2747 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2748
2749 search_tidyup(); /* Free any cached resources */
2750
2751 /* Show the complete set of headers if debugging. Note that the first one (the
2752 new Received:) has not yet been set. */
2753
2754 DEBUG(D_receive)
2755 {
2756 debug_printf(">>Headers after rewriting and local additions:\n");
2757 for (h = header_list->next; h != NULL; h = h->next)
2758 debug_printf("%c %s", h->type, h->text);
2759 debug_printf("\n");
2760 }
2761
2762 /* The headers are now complete in store. If we are running in filter
2763 testing mode, that is all this function does. Return TRUE if the message
2764 ended with a dot. */
2765
2766 if (filter_test != FTEST_NONE)
2767 {
2768 process_info[process_info_len] = 0;
2769 return message_ended == END_DOT;
2770 }
2771
2772 /* Cutthrough delivery:
2773 We have to create the Received header now rather than at the end of reception,
2774 so the timestamp behaviour is a change to the normal case.
2775 XXX Ensure this gets documented XXX.
2776 Having created it, send the headers to the destination.
2777 */
2778 if (cutthrough_fd >= 0)
2779 {
2780 if (received_count > received_headers_max)
2781 {
2782 cancel_cutthrough_connection("too many headers");
2783 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2784 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2785 "Too many \"Received\" headers",
2786 sender_address,
2787 (sender_fullhost == NULL)? "" : " H=",
2788 (sender_fullhost == NULL)? US"" : sender_fullhost,
2789 (sender_ident == NULL)? "" : " U=",
2790 (sender_ident == NULL)? US"" : sender_ident);
2791 message_id[0] = 0; /* Indicate no message accepted */
2792 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2793 goto TIDYUP; /* Skip to end of function */
2794 }
2795 received_header_gen();
2796 add_acl_headers(US"MAIL or RCPT");
2797 (void) cutthrough_headers_send();
2798 }
2799
2800
2801 /* Open a new spool file for the data portion of the message. We need
2802 to access it both via a file descriptor and a stream. Try to make the
2803 directory if it isn't there. Note re use of sprintf: spool_directory
2804 is checked on input to be < 200 characters long. */
2805
2806 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2807 message_id);
2808 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2809 if (data_fd < 0)
2810 {
2811 if (errno == ENOENT)
2812 {
2813 uschar temp[16];
2814 sprintf(CS temp, "input/%s", message_subdir);
2815 if (message_subdir[0] == 0) temp[5] = 0;
2816 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2817 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2818 }
2819 if (data_fd < 0)
2820 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2821 spool_name, strerror(errno));
2822 }
2823
2824 /* Make sure the file's group is the Exim gid, and double-check the mode
2825 because the group setting doesn't always get set automatically. */
2826
2827 if (fchown(data_fd, exim_uid, exim_gid))
2828 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2829 "Failed setting ownership on spool file %s: %s",
2830 spool_name, strerror(errno));
2831 (void)fchmod(data_fd, SPOOL_MODE);
2832
2833 /* We now have data file open. Build a stream for it and lock it. We lock only
2834 the first line of the file (containing the message ID) because otherwise there
2835 are problems when Exim is run under Cygwin (I'm told). See comments in
2836 spool_in.c, where the same locking is done. */
2837
2838 data_file = fdopen(data_fd, "w+");
2839 lock_data.l_type = F_WRLCK;
2840 lock_data.l_whence = SEEK_SET;
2841 lock_data.l_start = 0;
2842 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2843
2844 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2845 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2846 errno, strerror(errno));
2847
2848 /* We have an open, locked data file. Write the message id to it to make it
2849 self-identifying. Then read the remainder of the input of this message and
2850 write it to the data file. If the variable next != NULL, it contains the first
2851 data line (which was read as a header but then turned out not to have the right
2852 format); write it (remembering that it might contain binary zeros). The result
2853 of fwrite() isn't inspected; instead we call ferror() below. */
2854
2855 fprintf(data_file, "%s-D\n", message_id);
2856 if (next != NULL)
2857 {
2858 uschar *s = next->text;
2859 int len = next->slen;
2860 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2861 body_linecount++; /* Assumes only 1 line */
2862 }
2863
2864 /* Note that we might already be at end of file, or the logical end of file
2865 (indicated by '.'), or might have encountered an error while writing the
2866 message id or "next" line. */
2867
2868 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2869 {
2870 if (smtp_input)
2871 {
2872 message_ended = read_message_data_smtp(data_file);
2873 receive_linecount++; /* The terminating "." line */
2874 }
2875 else message_ended = read_message_data(data_file);
2876
2877 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2878 message_linecount += body_linecount;
2879
2880 /* Handle premature termination of SMTP */
2881
2882 if (smtp_input && message_ended == END_EOF)
2883 {
2884 Uunlink(spool_name); /* Lose data file when closed */
2885 cancel_cutthrough_connection("sender closed connection");
2886 message_id[0] = 0; /* Indicate no message accepted */
2887 smtp_reply = handle_lost_connection(US"");
2888 smtp_yield = FALSE;
2889 goto TIDYUP; /* Skip to end of function */
2890 }
2891
2892 /* Handle message that is too big. Don't use host_or_ident() in the log
2893 message; we want to see the ident value even for non-remote messages. */
2894
2895 if (message_ended == END_SIZE)
2896 {
2897 Uunlink(spool_name); /* Lose the data file when closed */
2898 cancel_cutthrough_connection("mail too big");
2899 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2900
2901 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2902 "message too big: read=%d max=%d",
2903 sender_address,
2904 (sender_fullhost == NULL)? "" : " H=",
2905 (sender_fullhost == NULL)? US"" : sender_fullhost,
2906 (sender_ident == NULL)? "" : " U=",
2907 (sender_ident == NULL)? US"" : sender_ident,
2908 message_size,
2909 thismessage_size_limit);
2910
2911 if (smtp_input)
2912 {
2913 smtp_reply = US"552 Message size exceeds maximum permitted";
2914 message_id[0] = 0; /* Indicate no message accepted */
2915 goto TIDYUP; /* Skip to end of function */
2916 }
2917 else
2918 {
2919 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2920 give_local_error(ERRMESS_TOOBIG,
2921 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2922 US"message rejected: ", error_rc, data_file, header_list);
2923 /* Does not return */
2924 }
2925 }
2926 }
2927
2928 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2929 example, there may be some expansion in an ACL that uses a timer.) */
2930
2931 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2932
2933 /* The message body has now been read into the data file. Call fflush() to
2934 empty the buffers in C, and then call fsync() to get the data written out onto
2935 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2936 having to do this). If there was an I/O error on either input or output,
2937 attempt to send an error message, and unlink the spool file. For non-SMTP input
2938 we can then give up. Note that for SMTP input we must swallow the remainder of
2939 the input in cases of output errors, since the far end doesn't expect to see
2940 anything until the terminating dot line is sent. */
2941
2942 if (fflush(data_file) == EOF || ferror(data_file) ||
2943 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2944 {
2945 uschar *msg_errno = US strerror(errno);
2946 BOOL input_error = (receive_ferror)() != 0;
2947 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2948 input_error? "Input read" : "Spool write",
2949 msg_errno,
2950 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2951
2952 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2953 Uunlink(spool_name); /* Lose the data file */
2954 cancel_cutthrough_connection("error writing spoolfile");
2955
2956 if (smtp_input)
2957 {
2958 if (input_error)
2959 smtp_reply = US"451 Error while reading input data";
2960 else
2961 {
2962 smtp_reply = US"451 Error while writing spool file";
2963 receive_swallow_smtp();
2964 }
2965 message_id[0] = 0; /* Indicate no message accepted */
2966 goto TIDYUP; /* Skip to end of function */
2967 }
2968
2969 else
2970 {
2971 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2972 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2973 header_list);
2974 /* Does not return */
2975 }
2976 }
2977
2978
2979 /* No I/O errors were encountered while writing the data file. */
2980
2981 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2982
2983
2984 /* If there were any bad addresses extracted by -t, or there were no recipients
2985 left after -t, send a message to the sender of this message, or write it to
2986 stderr if the error handling option is set that way. Note that there may
2987 legitimately be no recipients for an SMTP message if they have all been removed
2988 by "discard".
2989
2990 We need to rewind the data file in order to read it. In the case of no
2991 recipients or stderr error writing, throw the data file away afterwards, and
2992 exit. (This can't be SMTP, which always ensures there's at least one
2993 syntactically good recipient address.) */
2994
2995 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2996 {
2997 DEBUG(D_receive)
2998 {
2999 if (recipients_count == 0) debug_printf("*** No recipients\n");
3000 if (bad_addresses != NULL)
3001 {
3002 error_block *eblock = bad_addresses;
3003 debug_printf("*** Bad address(es)\n");
3004 while (eblock != NULL)
3005 {
3006 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3007 eblock = eblock->next;
3008 }
3009 }
3010 }
3011
3012 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3013
3014 /* If configured to send errors to the sender, but this fails, force
3015 a failure error code. We use a special one for no recipients so that it
3016 can be detected by the autoreply transport. Otherwise error_rc is set to
3017 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3018 it is EXIT_SUCCESS. */
3019
3020 if (error_handling == ERRORS_SENDER)
3021 {
3022 if (!moan_to_sender(
3023 (bad_addresses == NULL)?
3024 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3025 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3026 bad_addresses, header_list, data_file, FALSE))
3027 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3028 }
3029 else
3030 {
3031 if (bad_addresses == NULL)
3032 {
3033 if (extracted_ignored)
3034 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3035 else
3036 fprintf(stderr, "exim: no recipients in message\n");
3037 }
3038 else
3039 {
3040 fprintf(stderr, "exim: invalid address%s",
3041 (bad_addresses->next == NULL)? ":" : "es:\n");
3042 while (bad_addresses != NULL)
3043 {
3044 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3045 bad_addresses->text2);
3046 bad_addresses = bad_addresses->next;
3047 }
3048 }
3049 }
3050
3051 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3052 {
3053 Uunlink(spool_name);
3054 (void)fclose(data_file);
3055 exim_exit(error_rc);
3056 }
3057 }
3058
3059 /* Data file successfully written. Generate text for the Received: header by
3060 expanding the configured string, and adding a timestamp. By leaving this
3061 operation till now, we ensure that the timestamp is the time that message
3062 reception was completed. However, this is deliberately done before calling the
3063 data ACL and local_scan().
3064
3065 This Received: header may therefore be inspected by the data ACL and by code in
3066 the local_scan() function. When they have run, we update the timestamp to be
3067 the final time of reception.
3068
3069 If there is just one recipient, set up its value in the $received_for variable
3070 for use when we generate the Received: header.
3071
3072 Note: the checking for too many Received: headers is handled by the delivery
3073 code. */
3074 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3075
3076 if (received_header->text == NULL) /* Non-cutthrough case */
3077 {
3078 received_header_gen();
3079
3080 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3081
3082 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3083 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3084
3085 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3086 now, before running the DATA ACL. */
3087
3088 add_acl_headers(US"MAIL or RCPT");
3089 }
3090 else
3091 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3092 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3093
3094 /* If an ACL is specified for checking things at this stage of reception of a
3095 message, run it, unless all the recipients were removed by "discard" in earlier
3096 ACLs. That is the only case in which recipients_count can be zero at this
3097 stage. Set deliver_datafile to point to the data file so that $message_body and
3098 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3099 */
3100
3101 deliver_datafile = data_fd;
3102 user_msg = NULL;
3103
3104 enable_dollar_recipients = TRUE;
3105
3106 if (recipients_count == 0)
3107 {
3108 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3109 }
3110 else
3111 {
3112 /* Handle interactive SMTP messages */
3113
3114 if (smtp_input && !smtp_batched_input)
3115 {
3116
3117 #ifndef DISABLE_DKIM
3118 if (!dkim_disable_verify)
3119 {
3120 /* Finish verification, this will log individual signature results to
3121 the mainlog */
3122 dkim_exim_verify_finish();
3123
3124 /* Check if we must run the DKIM ACL */
3125 if ((acl_smtp_dkim != NULL) &&
3126 (dkim_verify_signers != NULL) &&
3127 (dkim_verify_signers[0] != '\0'))
3128 {
3129 uschar *dkim_verify_signers_expanded =
3130 expand_string(dkim_verify_signers);
3131 if (dkim_verify_signers_expanded == NULL)
3132 {
3133 log_write(0, LOG_MAIN|LOG_PANIC,
3134 "expansion of dkim_verify_signers option failed: %s",
3135 expand_string_message);
3136 }
3137 else
3138 {
3139 int sep = 0;
3140 uschar *ptr = dkim_verify_signers_expanded;
3141 uschar *item = NULL;
3142 uschar *seen_items = NULL;
3143 int seen_items_size = 0;
3144 int seen_items_offset = 0;
3145 uschar itembuf[256];
3146 /* Default to OK when no items are present */
3147 rc = OK;
3148 while ((item = string_nextinlist(&ptr, &sep,
3149 itembuf,
3150 sizeof(itembuf))) != NULL)
3151 {
3152 /* Prevent running ACL for an empty item */
3153 if (!item || (item[0] == '\0')) continue;
3154 /* Only run ACL once for each domain or identity, no matter how often it
3155 appears in the expanded list. */
3156 if (seen_items != NULL)
3157 {
3158 uschar *seen_item = NULL;
3159 uschar seen_item_buf[256];
3160 uschar *seen_items_list = seen_items;
3161 int seen_this_item = 0;
3162
3163 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3164 seen_item_buf,
3165 sizeof(seen_item_buf))) != NULL)
3166 {
3167 if (Ustrcmp(seen_item,item) == 0)
3168 {
3169 seen_this_item = 1;
3170 break;
3171 }
3172 }
3173
3174 if (seen_this_item > 0)
3175 {
3176 DEBUG(D_receive)
3177 debug_printf("acl_smtp_dkim: skipping signer %s, already seen\n", item);
3178 continue;
3179 }
3180
3181 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,":");
3182 }
3183
3184 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,item);
3185 seen_items[seen_items_offset] = '\0';
3186
3187 DEBUG(D_receive)
3188 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n", item);
3189
3190 dkim_exim_acl_setup(item);
3191 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, &user_msg, &log_msg);
3192
3193 if (rc != OK)
3194 {
3195 DEBUG(D_receive)
3196 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, skipping remaining items\n", rc, item);
3197 cancel_cutthrough_connection("dkim acl not ok");
3198 break;
3199 }
3200 }
3201 add_acl_headers(US"DKIM");
3202 if (rc == DISCARD)
3203 {
3204 recipients_count = 0;
3205 blackholed_by = US"DKIM ACL";
3206 if (log_msg != NULL)
3207 blackhole_log_msg = string_sprintf(": %s", log_msg);
3208 }
3209 else if (rc != OK)
3210 {
3211 Uunlink(spool_name);
3212 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3213 smtp_yield = FALSE; /* No more messsages after dropped connection */
3214 smtp_reply = US""; /* Indicate reply already sent */
3215 message_id[0] = 0; /* Indicate no message accepted */
3216 goto TIDYUP; /* Skip to end of function */
3217 }
3218 }
3219 }
3220 }
3221 #endif /* DISABLE_DKIM */
3222
3223 #ifdef WITH_CONTENT_SCAN
3224 if (recipients_count > 0 &&
3225 acl_smtp_mime != NULL &&
3226 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3227 goto TIDYUP;
3228 #endif /* WITH_CONTENT_SCAN */
3229
3230 #ifdef EXPERIMENTAL_PRDR
3231 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr != NULL )
3232 {
3233 unsigned int c;
3234 int all_pass = OK;
3235 int all_fail = FAIL;
3236
3237 smtp_printf("353 PRDR content analysis beginning\r\n");
3238 /* Loop through recipients, responses must be in same order received */
3239 for (c = 0; recipients_count > c; c++)
3240 {
3241 uschar * addr= recipients_list[c].address;
3242 uschar * msg= US"PRDR R=<%s> %s";
3243 uschar * code;
3244 DEBUG(D_receive)
3245 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3246 addr, c+1, recipients_count);
3247 rc = acl_check(ACL_WHERE_PRDR, addr,
3248 acl_smtp_data_prdr, &user_msg, &log_msg);
3249
3250 /* If any recipient rejected content, indicate it in final message */
3251 all_pass |= rc;
3252 /* If all recipients rejected, indicate in final message */
3253 all_fail &= rc;
3254
3255 switch (rc)
3256 {
3257 case OK: case DISCARD: code = US"250"; break;
3258 case DEFER: code = US"450"; break;
3259 default: code = US"550"; break;
3260 }
3261 if (user_msg != NULL)
3262 smtp_user_msg(code, user_msg);
3263 else
3264 {
3265 switch (rc)
3266 {
3267 case OK: case DISCARD:
3268 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3269 case DEFER:
3270 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3271 default:
3272 msg = string_sprintf(CS msg, addr, "refusal"); break;
3273 }
3274 smtp_user_msg(code, msg);
3275 }
3276 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3277 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3278 else log_write(0, LOG_MAIN, CS msg);
3279
3280 if (rc != OK) { receive_remove_recipient(addr); c--; }
3281 }
3282 /* Set up final message, used if data acl gives OK */
3283 smtp_reply = string_sprintf("%s id=%s message %s",
3284 all_fail == FAIL ? US"550" : US"250",
3285 message_id,
3286 all_fail == FAIL
3287 ? US"rejected for all recipients"
3288 : all_pass == OK
3289 ? US"accepted"
3290 : US"accepted for some recipients");
3291 if (recipients_count == 0)
3292 {
3293 message_id[0] = 0; /* Indicate no message accepted */
3294 goto TIDYUP;
3295 }
3296 }
3297 else
3298 prdr_requested = FALSE;
3299 #endif /* EXPERIMENTAL_PRDR */
3300
3301 /* Check the recipients count again, as the MIME ACL might have changed
3302 them. */
3303
3304 if (acl_smtp_data != NULL && recipients_count > 0)
3305 {
3306 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3307 add_acl_headers(US"DATA");
3308 if (rc == DISCARD)
3309 {
3310 recipients_count = 0;
3311 blackholed_by = US"DATA ACL";
3312 if (log_msg != NULL)
3313 blackhole_log_msg = string_sprintf(": %s", log_msg);
3314 cancel_cutthrough_connection("data acl discard");
3315 }
3316 else if (rc != OK)
3317 {
3318 Uunlink(spool_name);
3319 cancel_cutthrough_connection("data acl not ok");
3320 #ifdef WITH_CONTENT_SCAN
3321 unspool_mbox();
3322 #endif
3323 #ifdef EXPERIMENTAL_DCC
3324 dcc_ok = 0;
3325 #endif
3326 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3327 smtp_yield = FALSE; /* No more messsages after dropped connection */
3328 smtp_reply = US""; /* Indicate reply already sent */
3329 message_id[0] = 0; /* Indicate no message accepted */
3330 goto TIDYUP; /* Skip to end of function */
3331 }
3332 }
3333 }
3334
3335 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3336 we cannot take different actions for permanent and temporary rejections. */
3337
3338 else
3339 {
3340
3341 #ifdef WITH_CONTENT_SCAN
3342 if (acl_not_smtp_mime != NULL &&
3343 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3344 &blackholed_by))
3345 goto TIDYUP;
3346 #endif /* WITH_CONTENT_SCAN */
3347
3348 if (acl_not_smtp != NULL)
3349 {
3350 uschar *user_msg, *log_msg;
3351 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3352 if (rc == DISCARD)
3353 {
3354 recipients_count = 0;
3355 blackholed_by = US"non-SMTP ACL";
3356 if (log_msg != NULL)
3357 blackhole_log_msg = string_sprintf(": %s", log_msg);
3358 }
3359 else if (rc != OK)
3360 {
3361 Uunlink(spool_name);
3362 #ifdef WITH_CONTENT_SCAN
3363 unspool_mbox();
3364 #endif
3365 #ifdef EXPERIMENTAL_DCC
3366 dcc_ok = 0;
3367 #endif
3368 /* The ACL can specify where rejections are to be logged, possibly
3369 nowhere. The default is main and reject logs. */
3370
3371 if (log_reject_target != 0)
3372 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3373 sender_address, log_msg);
3374
3375 if (user_msg == NULL) user_msg = US"local configuration problem";
3376 if (smtp_batched_input)
3377 {
3378 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3379 /* Does not return */
3380 }
3381 else
3382 {
3383 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3384 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3385 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3386 header_list);
3387 /* Does not return */
3388 }
3389 }
3390 add_acl_headers(US"non-SMTP");
3391 }
3392 }
3393
3394 /* The applicable ACLs have been run */
3395
3396 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3397 if (queue_only_policy) queued_by = US"ACL";
3398 }
3399
3400 #ifdef WITH_CONTENT_SCAN
3401 unspool_mbox();
3402 #endif
3403
3404 #ifdef EXPERIMENTAL_DCC
3405 dcc_ok = 0;
3406 #endif
3407
3408
3409 /* The final check on the message is to run the scan_local() function. The
3410 version supplied with Exim always accepts, but this is a hook for sysadmins to
3411 supply their own checking code. The local_scan() function is run even when all
3412 the recipients have been discarded. */
3413
3414 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3415
3416 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3417 deleted, and the incident gets logged. */
3418
3419 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3420 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3421 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3422 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3423
3424 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3425 local_scan_timeout);
3426 local_scan_data = NULL;
3427
3428 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3429 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3430 rc = local_scan(data_fd, &local_scan_data);
3431 alarm(0);
3432 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3433
3434 enable_dollar_recipients = FALSE;
3435
3436 store_pool = POOL_MAIN; /* In case changed */
3437 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3438 local_scan_data);
3439
3440 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3441 os_non_restarting_signal(SIGFPE, SIG_DFL);
3442 os_non_restarting_signal(SIGILL, SIG_DFL);
3443 os_non_restarting_signal(SIGBUS, SIG_DFL);
3444
3445 /* The length check is paranoia against some runaway code, and also because
3446 (for a success return) lines in the spool file are read into big_buffer. */
3447
3448 if (local_scan_data != NULL)
3449 {
3450 int len = Ustrlen(local_scan_data);
3451 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3452 local_scan_data = string_copyn(local_scan_data, len);
3453 }
3454
3455 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3456 {
3457 if (!deliver_freeze) /* ACL might have already frozen */
3458 {
3459 deliver_freeze = TRUE;
3460 deliver_frozen_at = time(NULL);
3461 frozen_by = US"local_scan()";
3462 }
3463 rc = LOCAL_SCAN_ACCEPT;
3464 }
3465 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3466 {
3467 if (!queue_only_policy) /* ACL might have already queued */
3468 {
3469 queue_only_policy = TRUE;
3470 queued_by = US"local_scan()";
3471 }
3472 rc = LOCAL_SCAN_ACCEPT;
3473 }
3474
3475 /* Message accepted: remove newlines in local_scan_data because otherwise
3476 the spool file gets corrupted. Ensure that all recipients are qualified. */
3477
3478 if (rc == LOCAL_SCAN_ACCEPT)
3479 {
3480 if (local_scan_data != NULL)
3481 {
3482 uschar *s;
3483 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3484 }
3485 for (i = 0; i < recipients_count; i++)
3486 {
3487 recipient_item *r = recipients_list + i;
3488 r->address = rewrite_address_qualify(r->address, TRUE);
3489 if (r->errors_to != NULL)
3490 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3491 }
3492 if (recipients_count == 0 && blackholed_by == NULL)
3493 blackholed_by = US"local_scan";
3494 }
3495
3496 /* Message rejected: newlines permitted in local_scan_data to generate
3497 multiline SMTP responses. */
3498
3499 else
3500 {
3501 uschar *istemp = US"";
3502 uschar *s = NULL;
3503 uschar *smtp_code;
3504 int size = 0;
3505 int sptr = 0;
3506
3507 errmsg = local_scan_data;
3508
3509 Uunlink(spool_name); /* Cancel this message */
3510 switch(rc)
3511 {
3512 default:
3513 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3514 "rejection given", rc);
3515 goto TEMPREJECT;
3516
3517 case LOCAL_SCAN_REJECT_NOLOGHDR:
3518 log_extra_selector &= ~LX_rejected_header;
3519 /* Fall through */
3520
3521 case LOCAL_SCAN_REJECT:
3522 smtp_code = US"550";
3523 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3524 break;
3525
3526 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3527 log_extra_selector &= ~LX_rejected_header;
3528 /* Fall through */
3529
3530 case LOCAL_SCAN_TEMPREJECT:
3531 TEMPREJECT:
3532 smtp_code = US"451";
3533 if (errmsg == NULL) errmsg = US"Temporary local problem";
3534 istemp = US"temporarily ";
3535 break;
3536 }
3537
3538 s = string_append(s, &size, &sptr, 2, US"F=",
3539 (sender_address[0] == 0)? US"<>" : sender_address);
3540 s = add_host_info_for_log(s, &size, &sptr);
3541 s[sptr] = 0;
3542
3543 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3544 s, istemp, string_printing(errmsg));
3545
3546 if (smtp_input)
3547 {
3548 if (!smtp_batched_input)
3549 {
3550 smtp_respond(smtp_code, 3, TRUE, errmsg);
3551 message_id[0] = 0; /* Indicate no message accepted */
3552 smtp_reply = US""; /* Indicate reply already sent */
3553 goto TIDYUP; /* Skip to end of function */
3554 }
3555 else
3556 {
3557 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3558 /* Does not return */
3559 }
3560 }
3561 else
3562 {
3563 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3564 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3565 US"message rejected by local scan code: ", error_rc, data_file,
3566 header_list);
3567 /* Does not return */
3568 }
3569 }
3570
3571 /* Reset signal handlers to ignore signals that previously would have caused
3572 the message to be abandoned. */
3573
3574 signal(SIGTERM, SIG_IGN);
3575 signal(SIGINT, SIG_IGN);
3576
3577
3578 /* Ensure the first time flag is set in the newly-received message. */
3579
3580 deliver_firsttime = TRUE;
3581
3582 #ifdef EXPERIMENTAL_BRIGHTMAIL
3583 if (bmi_run == 1) {
3584 /* rewind data file */
3585 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3586 bmi_verdicts = bmi_process_message(header_list, data_fd);
3587 };
3588 #endif
3589
3590 /* Update the timstamp in our Received: header to account for any time taken by
3591 an ACL or by local_scan(). The new time is the time that all reception
3592 processing is complete. */
3593
3594 timestamp = expand_string(US"${tod_full}");
3595 tslen = Ustrlen(timestamp);
3596
3597 memcpy(received_header->text + received_header->slen - tslen - 1,
3598 timestamp, tslen);
3599
3600 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3601
3602 if (mua_wrapper)
3603 {
3604 deliver_freeze = FALSE;
3605 queue_only_policy = FALSE;
3606 }
3607
3608 /* Keep the data file open until we have written the header file, in order to
3609 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3610 don't write the header file, and we unlink the data file. If writing the header
3611 file fails, we have failed to accept this message. */
3612
3613 if (host_checking || blackholed_by != NULL)
3614 {
3615 header_line *h;
3616 Uunlink(spool_name);
3617 msg_size = 0; /* Compute size for log line */
3618 for (h = header_list; h != NULL; h = h->next)
3619 if (h->type != '*') msg_size += h->slen;
3620 }
3621
3622 /* Write the -H file */
3623
3624 else
3625 {
3626 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3627 {
3628 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3629 Uunlink(spool_name); /* Lose the data file */
3630
3631 if (smtp_input)
3632 {
3633 smtp_reply = US"451 Error in writing spool file";
3634 message_id[0] = 0; /* Indicate no message accepted */
3635 goto TIDYUP;
3636 }
3637 else
3638 {
3639 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3640 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3641 header_list);
3642 /* Does not return */
3643 }
3644 }
3645 }
3646
3647
3648 /* The message has now been successfully received. */
3649
3650 receive_messagecount++;
3651
3652 /* In SMTP sessions we may receive several in one connection. After each one,
3653 we wait for the clock to tick at the level of message-id granularity. This is
3654 so that the combination of time+pid is unique, even on systems where the pid
3655 can be re-used within our time interval. We can't shorten the interval without
3656 re-designing the message-id. See comments above where the message id is
3657 created. This is Something For The Future. */
3658
3659 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3660 exim_wait_tick(&message_id_tv, id_resolution);
3661
3662 /* Add data size to written header size. We do not count the initial file name
3663 that is in the file, but we do add one extra for the notional blank line that
3664 precedes the data. This total differs from message_size in that it include the
3665 added Received: header and any other headers that got created locally. */
3666
3667 fflush(data_file);
3668 fstat(data_fd, &statbuf);
3669
3670 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3671
3672 /* Generate a "message received" log entry. We do this by building up a dynamic
3673 string as required. Since we commonly want to add two items at a time, use a
3674 macro to simplify the coding. We log the arrival of a new message while the
3675 file is still locked, just in case the machine is *really* fast, and delivers
3676 it first! Include any message id that is in the message - since the syntax of a
3677 message id is actually an addr-spec, we can use the parse routine to canonicize
3678 it. */
3679
3680 size = 256;
3681 sptr = 0;
3682 s = store_get(size);
3683
3684 s = string_append(s, &size, &sptr, 2, US"<= ",
3685 (sender_address[0] == 0)? US"<>" : sender_address);
3686 if (message_reference != NULL)
3687 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3688
3689 s = add_host_info_for_log(s, &size, &sptr);
3690
3691 #ifdef SUPPORT_TLS
3692 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_in.cipher != NULL)
3693 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3694 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3695 tls_in.cipher != NULL)
3696 s = string_append(s, &size, &sptr, 2, US" CV=",
3697 tls_in.certificate_verified? "yes":"no");
3698 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_in.peerdn != NULL)
3699 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3700 string_printing(tls_in.peerdn), US"\"");
3701 if ((log_extra_selector & LX_tls_sni) != 0 && tls_in.sni != NULL)
3702 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3703 string_printing(tls_in.sni), US"\"");
3704 #endif
3705
3706 if (sender_host_authenticated != NULL)
3707 {
3708 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3709 if (authenticated_id != NULL)
3710 {
3711 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3712 if (log_extra_selector & LX_smtp_mailauth && authenticated_sender != NULL)
3713 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3714 }
3715 }
3716
3717 #ifdef EXPERIMENTAL_PRDR
3718 if (prdr_requested)
3719 s = string_append(s, &size, &sptr, 1, US" PRDR");
3720 #endif
3721
3722 sprintf(CS big_buffer, "%d", msg_size);
3723 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3724
3725 /* log 8BITMIME mode announced in MAIL_FROM
3726 0 ... no BODY= used
3727 7 ... 7BIT
3728 8 ... 8BITMIME */
3729 if (log_extra_selector & LX_8bitmime)
3730 {
3731 sprintf(CS big_buffer, "%d", body_8bitmime);
3732 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3733 }
3734
3735 /* If an addr-spec in a message-id contains a quoted string, it can contain
3736 any characters except " \ and CR and so in particular it can contain NL!
3737 Therefore, make sure we use a printing-characters only version for the log.
3738 Also, allow for domain literals in the message id. */
3739
3740 if (msgid_header != NULL)
3741 {
3742 uschar *old_id;
3743 BOOL save_allow_domain_literals = allow_domain_literals;
3744 allow_domain_literals = TRUE;
3745 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3746 &errmsg, &start, &end, &domain, FALSE);
3747 allow_domain_literals = save_allow_domain_literals;
3748 if (old_id != NULL)
3749 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3750 }
3751
3752 /* If subject logging is turned on, create suitable printing-character
3753 text. By expanding $h_subject: we make use of the MIME decoding. */
3754
3755 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3756 {
3757 int i;
3758 uschar *p = big_buffer;
3759 uschar *ss = expand_string(US"$h_subject:");
3760
3761 /* Backslash-quote any double quotes or backslashes so as to make a
3762 a C-like string, and turn any non-printers into escape sequences. */
3763
3764 *p++ = '\"';
3765 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3766 {
3767 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3768 *p++ = ss[i];
3769 }
3770 *p++ = '\"';
3771 *p = 0;
3772 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3773 }
3774
3775 /* Terminate the string: string_cat() and string_append() leave room, but do
3776 not put the zero in. */
3777
3778 s[sptr] = 0;
3779
3780 /* Create a message log file if message logs are being used and this message is
3781 not blackholed. Write the reception stuff to it. We used to leave message log
3782 creation until the first delivery, but this has proved confusing for some
3783 people. */
3784
3785 if (message_logs && blackholed_by == NULL)
3786 {
3787 int fd;
3788
3789 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3790 message_id);
3791 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3792
3793 if (fd < 0 && errno == ENOENT)
3794 {
3795 uschar temp[16];
3796 sprintf(CS temp, "msglog/%s", message_subdir);
3797 if (message_subdir[0] == 0) temp[6] = 0;
3798 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3799 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3800 }
3801
3802 if (fd < 0)
3803 {
3804 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3805 spool_name, strerror(errno));
3806 }
3807
3808 else
3809 {
3810 FILE *message_log = fdopen(fd, "a");
3811 if (message_log == NULL)
3812 {
3813 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3814 spool_name, strerror(errno));
3815 (void)close(fd);
3816 }
3817 else
3818 {
3819 uschar *now = tod_stamp(tod_log);
3820 fprintf(message_log, "%s Received from %s\n", now, s+3);
3821 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3822 frozen_by);
3823 if (queue_only_policy) fprintf(message_log,
3824 "%s no immediate delivery: queued by %s\n", now, queued_by);
3825 (void)fclose(message_log);
3826 }
3827 }
3828 }
3829
3830 /* Everything has now been done for a successful message except logging its
3831 arrival, and outputting an SMTP response. While writing to the log, set a flag
3832 to cause a call to receive_bomb_out() if the log cannot be opened. */
3833
3834 receive_call_bombout = TRUE;
3835
3836 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3837 connection has gone away. This can only be done if there is no unconsumed input
3838 waiting in the local input buffer. We can test for this by calling
3839 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3840 input to be sent following the final dot, so the presence of following input is
3841 not an error.
3842
3843 If the connection is still present, but there is no unread input for the
3844 socket, the result of a select() call will be zero. If, however, the connection
3845 has gone away, or if there is pending input, the result of select() will be
3846 non-zero. The two cases can be distinguished by trying to read the next input
3847 character. If we succeed, we can unread it so that it remains in the local
3848 buffer for handling later. If not, the connection has been lost.
3849
3850 Of course, since TCP/IP is asynchronous, there is always a chance that the
3851 connection will vanish between the time of this test and the sending of the
3852 response, but the chance of this happening should be small. */
3853
3854 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3855 !receive_smtp_buffered())
3856 {
3857 struct timeval tv;
3858 fd_set select_check;
3859 FD_ZERO(&select_check);
3860 FD_SET(fileno(smtp_in), &select_check);
3861 tv.tv_sec = 0;
3862 tv.tv_usec = 0;
3863
3864 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3865 {
3866 int c = (receive_getc)();
3867 if (c != EOF) (receive_ungetc)(c); else
3868 {
3869 uschar *msg = US"SMTP connection lost after final dot";
3870 smtp_reply = US""; /* No attempt to send a response */
3871 smtp_yield = FALSE; /* Nothing more on this connection */
3872
3873 /* Re-use the log line workspace */
3874
3875 sptr = 0;
3876 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3877 s = add_host_info_for_log(s, &size, &sptr);
3878 s[sptr] = 0;
3879 log_write(0, LOG_MAIN, "%s", s);
3880
3881 /* Delete the files for this aborted message. */
3882
3883 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3884 message_subdir, message_id);
3885 Uunlink(spool_name);
3886
3887 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3888 message_subdir, message_id);
3889 Uunlink(spool_name);
3890
3891 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3892 message_subdir, message_id);
3893 Uunlink(spool_name);
3894
3895 goto TIDYUP;
3896 }
3897 }
3898 }
3899
3900 /* The connection has not gone away; we really are going to take responsibility
3901 for this message. */
3902
3903 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
3904 data onward by now.
3905
3906 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
3907 the sender's dot (below).
3908 If rejected: copy response to sender, wipe the spooled files, log approriately.
3909 If temp-reject: accept to sender, keep the spooled files.
3910
3911 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3912
3913 XXX We do not handle queue-only, freezing, or blackholes.
3914 */
3915 cutthrough_done = 0;
3916 if(cutthrough_fd >= 0)
3917 {
3918 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the messsage */
3919 /* Logging was done in finaldot() */
3920 switch(msg[0])
3921 {
3922 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3923 cutthrough_done = 3;
3924 break; /* message_id needed for SMTP accept below */
3925
3926 default: /* Unknown response, or error. Treat as temp-reject. */
3927 case '4': /* Temp-reject. Keep spoolfiles and accept. */
3928 cutthrough_done = 1; /* Avoid the usual immediate delivery attempt */
3929 break; /* message_id needed for SMTP accept below */
3930
3931 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
3932 smtp_reply= msg; /* Pass on the exact error */
3933 cutthrough_done = 2;
3934 break;
3935 }
3936 }
3937
3938 if(smtp_reply == NULL
3939 #ifdef EXPERIMENTAL_PRDR
3940 || prdr_requested
3941 #endif
3942 )
3943 {
3944 log_write(0, LOG_MAIN |
3945 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3946 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3947 "%s", s);
3948
3949 /* Log any control actions taken by an ACL or local_scan(). */
3950
3951 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3952 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3953 "no immediate delivery: queued by %s", queued_by);
3954 }
3955 receive_call_bombout = FALSE;
3956
3957 store_reset(s); /* The store for the main log message can be reused */
3958
3959 /* If the message is frozen, and freeze_tell is set, do the telling. */
3960
3961 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3962 {
3963 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3964 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3965 message_id, frozen_by, sender_address);
3966 }
3967
3968
3969 /* Either a message has been successfully received and written to the two spool
3970 files, or an error in writing the spool has occurred for an SMTP message, or
3971 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
3972 we will have already given up because there's no point in carrying on!) In
3973 either event, we must now close (and thereby unlock) the data file. In the
3974 successful case, this leaves the message on the spool, ready for delivery. In
3975 the error case, the spool file will be deleted. Then tidy up store, interact
3976 with an SMTP call if necessary, and return.
3977
3978 A fflush() was done earlier in the expectation that any write errors on the
3979 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3980 possible for fclose() to fail - but what to do? What has happened to the lock
3981 if this happens? */
3982
3983
3984 TIDYUP:
3985 process_info[process_info_len] = 0; /* Remove message id */
3986 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
3987
3988 /* Now reset signal handlers to their defaults */
3989
3990 signal(SIGTERM, SIG_DFL);
3991 signal(SIGINT, SIG_DFL);
3992
3993 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3994 value, which defaults TRUE - meaning there may be more incoming messages from
3995 this connection. For non-SMTP callers (where there is only ever one message),
3996 the default is FALSE. */
3997
3998 if (smtp_input)
3999 {
4000 yield = smtp_yield;
4001
4002 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4003 is set to the response that should be sent. When it is NULL, we generate
4004 default responses. After an ACL error or local_scan() error, the response has
4005 already been sent, and smtp_reply is an empty string to indicate this. */
4006
4007 if (!smtp_batched_input)
4008 {
4009 if (smtp_reply == NULL)
4010 {
4011 if (fake_response != OK)
4012 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4013 fake_response_text);
4014
4015 /* An OK response is required; use "message" text if present. */
4016
4017 else if (user_msg != NULL)
4018 {
4019 uschar *code = US"250";
4020 int len = 3;
4021 smtp_message_code(&code, &len, &user_msg, NULL);
4022 smtp_respond(code, len, TRUE, user_msg);
4023 }
4024
4025 /* Default OK response */
4026
4027 else
4028 smtp_printf("250 OK id=%s\r\n", message_id);
4029 if (host_checking)
4030 fprintf(stdout,
4031 "\n**** SMTP testing: that is not a real message id!\n\n");
4032 }
4033
4034 /* smtp_reply is set non-empty */
4035
4036 else if (smtp_reply[0] != 0)
4037 {
4038 if (fake_response != OK && (smtp_reply[0] == '2'))
4039 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4040 fake_response_text);
4041 else
4042 smtp_printf("%.1024s\r\n", smtp_reply);
4043 }
4044
4045 switch (cutthrough_done)
4046 {
4047 case 3: log_write(0, LOG_MAIN, "Completed"); /* Delivery was done */
4048 case 2: { /* Delete spool files */
4049 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
4050 message_subdir, message_id);
4051 Uunlink(spool_name);
4052 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
4053 message_subdir, message_id);
4054 Uunlink(spool_name);
4055 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
4056 message_subdir, message_id);
4057 Uunlink(spool_name);
4058 }
4059 case 1: message_id[0] = 0; /* Prevent a delivery from starting */