4cea6d58ee038f19a11c35a2c01eea328d78df32
[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 static BOOL already_bombing_out;
290 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
291 timeouts, if someone has something slow in their quit ACL. Since the only
292 things we should be doing are to close down cleanly ASAP, on the second
293 pass we also close down stuff that might be opened again, before bypassing
294 the ACL call and exiting. */
295
296 /* If spool_name is set, it contains the name of the data file that is being
297 written. Unlink it before closing so that it cannot be picked up by a delivery
298 process. Ensure that any header file is also removed. */
299
300 if (spool_name[0] != '\0')
301 {
302 Uunlink(spool_name);
303 spool_name[Ustrlen(spool_name) - 1] = 'H';
304 Uunlink(spool_name);
305 spool_name[0] = '\0';
306 }
307
308 /* Now close the file if it is open, either as a fd or a stream. */
309
310 if (data_file != NULL)
311 {
312 (void)fclose(data_file);
313 data_file = NULL;
314 } else if (data_fd >= 0) {
315 (void)close(data_fd);
316 data_fd = -1;
317 }
318
319 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
320 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
321 SMTP response. */
322
323 if (!already_bombing_out)
324 {
325 already_bombing_out = TRUE;
326 if (smtp_input)
327 {
328 if (smtp_batched_input)
329 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
330 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
331 smtp_active_hostname, msg);
332 }
333 }
334
335 /* Exit from the program (non-BSMTP cases) */
336
337 exim_exit(EXIT_FAILURE);
338 }
339
340
341 /*************************************************
342 * Data read timeout *
343 *************************************************/
344
345 /* Handler function for timeouts that occur while reading the data that
346 comprises a message.
347
348 Argument: the signal number
349 Returns: nothing
350 */
351
352 static void
353 data_timeout_handler(int sig)
354 {
355 uschar *msg = NULL;
356
357 sig = sig; /* Keep picky compilers happy */
358
359 if (smtp_input)
360 {
361 msg = US"SMTP incoming data timeout";
362 log_write(L_lost_incoming_connection,
363 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
364 "from %s F=<%s>",
365 (sender_fullhost != NULL)? sender_fullhost : US"local process",
366 sender_address);
367 }
368 else
369 {
370 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
371 log_write(L_lost_incoming_connection,
372 LOG_MAIN, "timed out while reading local message");
373 }
374
375 receive_bomb_out(US"data-timeout", msg); /* Does not return */
376 }
377
378
379
380 /*************************************************
381 * local_scan() timeout *
382 *************************************************/
383
384 /* Handler function for timeouts that occur while running a local_scan()
385 function.
386
387 Argument: the signal number
388 Returns: nothing
389 */
390
391 static void
392 local_scan_timeout_handler(int sig)
393 {
394 sig = sig; /* Keep picky compilers happy */
395 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
396 "message temporarily rejected (size %d)", message_size);
397 /* Does not return */
398 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
399 }
400
401
402
403 /*************************************************
404 * local_scan() crashed *
405 *************************************************/
406
407 /* Handler function for signals that occur while running a local_scan()
408 function.
409
410 Argument: the signal number
411 Returns: nothing
412 */
413
414 static void
415 local_scan_crash_handler(int sig)
416 {
417 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
418 "signal %d - message temporarily rejected (size %d)", sig, message_size);
419 /* Does not return */
420 receive_bomb_out(US"local-scan-error", US"local verification problem");
421 }
422
423
424 /*************************************************
425 * SIGTERM or SIGINT received *
426 *************************************************/
427
428 /* Handler for SIGTERM or SIGINT signals that occur while reading the
429 data that comprises a message.
430
431 Argument: the signal number
432 Returns: nothing
433 */
434
435 static void
436 data_sigterm_sigint_handler(int sig)
437 {
438 uschar *msg = NULL;
439
440 if (smtp_input)
441 {
442 msg = US"Service not available - SIGTERM or SIGINT received";
443 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
444 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
445 }
446 else
447 {
448 if (filter_test == FTEST_NONE)
449 {
450 fprintf(stderr, "\nexim: %s received - message abandoned\n",
451 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
452 log_write(0, LOG_MAIN, "%s received while reading local message",
453 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
454 }
455 }
456
457 receive_bomb_out(US"signal-exit", msg); /* Does not return */
458 }
459
460
461
462 /*************************************************
463 * Add new recipient to list *
464 *************************************************/
465
466 /* This function builds a list of recipient addresses in argc/argv
467 format.
468
469 Arguments:
470 recipient the next address to add to recipients_list
471 pno parent number for fixed aliases; -1 otherwise
472
473 Returns: nothing
474 */
475
476 void
477 receive_add_recipient(uschar *recipient, int pno)
478 {
479 if (recipients_count >= recipients_list_max)
480 {
481 recipient_item *oldlist = recipients_list;
482 int oldmax = recipients_list_max;
483 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
484 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
485 if (oldlist != NULL)
486 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
487 }
488
489 recipients_list[recipients_count].address = recipient;
490 recipients_list[recipients_count].pno = pno;
491 #ifdef EXPERIMENTAL_BRIGHTMAIL
492 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
493 /* reset optin string pointer for next recipient */
494 bmi_current_optin = NULL;
495 #endif
496 recipients_list[recipients_count++].errors_to = NULL;
497 }
498
499
500
501
502 /*************************************************
503 * Send user response message *
504 *************************************************/
505
506 /* This function is passed a default response code and a user message. It calls
507 smtp_message_code() to check and possibly modify the response code, and then
508 calls smtp_respond() to transmit the response. I put this into a function
509 just to avoid a lot of repetition.
510
511 Arguments:
512 code the response code
513 user_msg the user message
514
515 Returns: nothing
516 */
517
518 #ifdef EXPERIMENTAL_PRDR
519 static void
520 smtp_user_msg(uschar *code, uschar *user_msg)
521 {
522 int len = 3;
523 smtp_message_code(&code, &len, &user_msg, NULL);
524 smtp_respond(code, len, TRUE, user_msg);
525 }
526 #endif
527
528
529
530
531
532 /*************************************************
533 * Remove a recipient from the list *
534 *************************************************/
535
536 /* This function is provided for local_scan() to use.
537
538 Argument:
539 recipient address to remove
540
541 Returns: TRUE if it did remove something; FALSE otherwise
542 */
543
544 BOOL
545 receive_remove_recipient(uschar *recipient)
546 {
547 int count;
548 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
549 recipient);
550 for (count = 0; count < recipients_count; count++)
551 {
552 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
553 {
554 if ((--recipients_count - count) > 0)
555 memmove(recipients_list + count, recipients_list + count + 1,
556 (recipients_count - count)*sizeof(recipient_item));
557 return TRUE;
558 }
559 }
560 return FALSE;
561 }
562
563
564
565
566
567 /*************************************************
568 * Read data portion of a non-SMTP message *
569 *************************************************/
570
571 /* This function is called to read the remainder of a message (following the
572 header) when the input is not from SMTP - we are receiving a local message on
573 a standard input stream. The message is always terminated by EOF, and is also
574 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
575 two cases for maximum efficiency.
576
577 Ensure that the body ends with a newline. This will naturally be the case when
578 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
579 as "sequences of lines" - this of course strictly applies only to SMTP, but
580 deliveries into BSD-type mailbox files also require it. Exim used to have a
581 flag for doing this at delivery time, but as it was always set for all
582 transports, I decided to simplify things by putting the check here instead.
583
584 There is at least one MUA (dtmail) that sends CRLF via this interface, and
585 other programs are known to do this as well. Exim used to have a option for
586 dealing with this: in July 2003, after much discussion, the code has been
587 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
588
589 However, for the case when a dot on a line by itself terminates a message, the
590 only recognized terminating sequences before and after the dot are LF and CRLF.
591 Otherwise, having read EOL . CR, you don't know whether to read another
592 character or not.
593
594 Internally, in messages stored in Exim's spool files, LF is used as the line
595 terminator. Under the new regime, bare CRs will no longer appear in these
596 files.
597
598 Arguments:
599 fout a FILE to which to write the message
600
601 Returns: One of the END_xxx values indicating why it stopped reading
602 */
603
604 static int
605 read_message_data(FILE *fout)
606 {
607 int ch_state;
608 register int ch;
609 register int linelength = 0;
610
611 /* Handle the case when only EOF terminates the message */
612
613 if (!dot_ends)
614 {
615 register int last_ch = '\n';
616
617 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
618 {
619 if (ch == 0) body_zerocount++;
620 if (last_ch == '\r' && ch != '\n')
621 {
622 if (linelength > max_received_linelength)
623 max_received_linelength = linelength;
624 linelength = 0;
625 if (fputc('\n', fout) == EOF) return END_WERROR;
626 message_size++;
627 body_linecount++;
628 }
629 if (ch == '\r') continue;
630
631 if (fputc(ch, fout) == EOF) return END_WERROR;
632 if (ch == '\n')
633 {
634 if (linelength > max_received_linelength)
635 max_received_linelength = linelength;
636 linelength = 0;
637 body_linecount++;
638 }
639 else linelength++;
640 if (++message_size > thismessage_size_limit) return END_SIZE;
641 }
642
643 if (last_ch != '\n')
644 {
645 if (linelength > max_received_linelength)
646 max_received_linelength = linelength;
647 if (fputc('\n', fout) == EOF) return END_WERROR;
648 message_size++;
649 body_linecount++;
650 }
651
652 return END_EOF;
653 }
654
655 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
656
657 ch_state = 1;
658
659 while ((ch = (receive_getc)()) != EOF)
660 {
661 if (ch == 0) body_zerocount++;
662 switch (ch_state)
663 {
664 case 0: /* Normal state (previous char written) */
665 if (ch == '\n')
666 {
667 body_linecount++;
668 if (linelength > max_received_linelength)
669 max_received_linelength = linelength;
670 linelength = -1;
671 ch_state = 1;
672 }
673 else if (ch == '\r')
674 { ch_state = 2; continue; }
675 break;
676
677 case 1: /* After written "\n" */
678 if (ch == '.') { ch_state = 3; continue; }
679 if (ch != '\n') ch_state = 0; else linelength = -1;
680 break;
681
682 case 2:
683 body_linecount++; /* After unwritten "\r" */
684 if (linelength > max_received_linelength)
685 max_received_linelength = linelength;
686 if (ch == '\n')
687 {
688 ch_state = 1;
689 linelength = -1;
690 }
691 else
692 {
693 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
694 if (ch == '\r') continue;
695 ch_state = 0;
696 linelength = 0;
697 }
698 break;
699
700 case 3: /* After "\n." (\n written, dot not) */
701 if (ch == '\n') return END_DOT;
702 if (ch == '\r') { ch_state = 4; continue; }
703 message_size++;
704 linelength++;
705 if (fputc('.', fout) == EOF) return END_WERROR;
706 ch_state = 0;
707 break;
708
709 case 4: /* After "\n.\r" (\n written, rest not) */
710 if (ch == '\n') return END_DOT;
711 message_size += 2;
712 body_linecount++;
713 if (fputs(".\n", fout) == EOF) return END_WERROR;
714 if (ch == '\r') { ch_state = 2; continue; }
715 ch_state = 0;
716 break;
717 }
718
719 linelength++;
720 if (fputc(ch, fout) == EOF) return END_WERROR;
721 if (++message_size > thismessage_size_limit) return END_SIZE;
722 }
723
724 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
725 the message ends with a newline, and we must also write any characters that
726 were saved up while testing for an ending dot. */
727
728 if (ch_state != 1)
729 {
730 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
731 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
732 message_size += Ustrlen(ends[ch_state]);
733 body_linecount++;
734 }
735
736 return END_EOF;
737 }
738
739
740
741
742 /*************************************************
743 * Read data portion of an SMTP message *
744 *************************************************/
745
746 /* This function is called to read the remainder of an SMTP message (after the
747 headers), or to skip over it when an error has occurred. In this case, the
748 output file is passed as NULL.
749
750 If any line begins with a dot, that character is skipped. The input should only
751 be successfully terminated by CR LF . CR LF unless it is local (non-network)
752 SMTP, in which case the CRs are optional, but...
753
754 FUDGE: It seems that sites on the net send out messages with just LF
755 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
756 we make the CRs optional in all cases.
757
758 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
759 well, so that there are no CRs in spooled messages. However, the message
760 terminating dot is not recognized between two bare CRs.
761
762 Arguments:
763 fout a FILE to which to write the message; NULL if skipping
764
765 Returns: One of the END_xxx values indicating why it stopped reading
766 */
767
768 static int
769 read_message_data_smtp(FILE *fout)
770 {
771 int ch_state = 0;
772 int ch;
773 register int linelength = 0;
774
775 while ((ch = (receive_getc)()) != EOF)
776 {
777 if (ch == 0) body_zerocount++;
778 switch (ch_state)
779 {
780 case 0: /* After LF or CRLF */
781 if (ch == '.')
782 {
783 ch_state = 3;
784 continue; /* Don't ever write . after LF */
785 }
786 ch_state = 1;
787
788 /* Else fall through to handle as normal uschar. */
789
790 case 1: /* Normal state */
791 if (ch == '\n')
792 {
793 ch_state = 0;
794 body_linecount++;
795 if (linelength > max_received_linelength)
796 max_received_linelength = linelength;
797 linelength = -1;
798 }
799 else if (ch == '\r')
800 {
801 ch_state = 2;
802 continue;
803 }
804 break;
805
806 case 2: /* After (unwritten) CR */
807 body_linecount++;
808 if (linelength > max_received_linelength)
809 max_received_linelength = linelength;
810 linelength = -1;
811 if (ch == '\n')
812 {
813 ch_state = 0;
814 }
815 else
816 {
817 message_size++;
818 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
819 (void) cutthrough_put_nl();
820 if (ch != '\r') ch_state = 1; else continue;
821 }
822 break;
823
824 case 3: /* After [CR] LF . */
825 if (ch == '\n')
826 return END_DOT;
827 if (ch == '\r')
828 {
829 ch_state = 4;
830 continue;
831 }
832 ch_state = 1; /* The dot itself is removed */
833 break;
834
835 case 4: /* After [CR] LF . CR */
836 if (ch == '\n') return END_DOT;
837 message_size++;
838 body_linecount++;
839 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
840 (void) cutthrough_put_nl();
841 if (ch == '\r')
842 {
843 ch_state = 2;
844 continue;
845 }
846 ch_state = 1;
847 break;
848 }
849
850 /* Add the character to the spool file, unless skipping; then loop for the
851 next. */
852
853 message_size++;
854 linelength++;
855 if (fout != NULL)
856 {
857 if (fputc(ch, fout) == EOF) return END_WERROR;
858 if (message_size > thismessage_size_limit) return END_SIZE;
859 }
860 if(ch == '\n')
861 (void) cutthrough_put_nl();
862 else
863 {
864 uschar c= ch;
865 (void) cutthrough_puts(&c, 1);
866 }
867 }
868
869 /* Fall through here if EOF encountered. This indicates some kind of error,
870 since a correct message is terminated by [CR] LF . [CR] LF. */
871
872 return END_EOF;
873 }
874
875
876
877
878 /*************************************************
879 * Swallow SMTP message *
880 *************************************************/
881
882 /* This function is called when there has been some kind of error while reading
883 an SMTP message, and the remaining data may need to be swallowed. It is global
884 because it is called from smtp_closedown() to shut down an incoming call
885 tidily.
886
887 Argument: a FILE from which to read the message
888 Returns: nothing
889 */
890
891 void
892 receive_swallow_smtp(void)
893 {
894 if (message_ended >= END_NOTENDED)
895 message_ended = read_message_data_smtp(NULL);
896 }
897
898
899
900 /*************************************************
901 * Handle lost SMTP connection *
902 *************************************************/
903
904 /* This function logs connection loss incidents and generates an appropriate
905 SMTP response.
906
907 Argument: additional data for the message
908 Returns: the SMTP response
909 */
910
911 static uschar *
912 handle_lost_connection(uschar *s)
913 {
914 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
915 "%s lost while reading message data%s", smtp_get_connection_info(), s);
916 return US"421 Lost incoming connection";
917 }
918
919
920
921
922 /*************************************************
923 * Handle a non-smtp reception error *
924 *************************************************/
925
926 /* This function is called for various errors during the reception of non-SMTP
927 messages. It either sends a message to the sender of the problem message, or it
928 writes to the standard error stream.
929
930 Arguments:
931 errcode code for moan_to_sender(), identifying the error
932 text1 first message text, passed to moan_to_sender()
933 text2 second message text, used only for stderrr
934 error_rc code to pass to exim_exit if no problem
935 f FILE containing body of message (may be stdin)
936 hptr pointer to instore headers or NULL
937
938 Returns: calls exim_exit(), which does not return
939 */
940
941 static void
942 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
943 FILE *f, header_line *hptr)
944 {
945 if (error_handling == ERRORS_SENDER)
946 {
947 error_block eblock;
948 eblock.next = NULL;
949 eblock.text1 = text1;
950 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
951 error_rc = EXIT_FAILURE;
952 }
953 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
954 (void)fclose(f);
955 exim_exit(error_rc);
956 }
957
958
959
960 /*************************************************
961 * Add header lines set up by ACL *
962 *************************************************/
963
964 /* This function is called to add the header lines that were set up by
965 statements in an ACL to the list of headers in memory. It is done in two stages
966 like this, because when the ACL for RCPT is running, the other headers have not
967 yet been received. This function is called twice; once just before running the
968 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
969 are visible to the DATA ACL.
970
971 Originally these header lines were added at the end. Now there is support for
972 three different places: top, bottom, and after the Received: header(s). There
973 will always be at least one Received: header, even if it is marked deleted, and
974 even if something else has been put in front of it.
975
976 Arguments:
977 acl_name text to identify which ACL
978
979 Returns: nothing
980 */
981
982 static void
983 add_acl_headers(uschar *acl_name)
984 {
985 header_line *h, *next;
986 header_line *last_received = NULL;
987
988 if (acl_removed_headers != NULL)
989 {
990 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
991
992 for (h = header_list; h != NULL; h = h->next)
993 {
994 uschar *list;
995 BOOL include_header;
996
997 if (h->type == htype_old) continue;
998
999 include_header = TRUE;
1000 list = acl_removed_headers;
1001
1002 int sep = ':'; /* This is specified as a colon-separated list */
1003 uschar *s;
1004 uschar buffer[128];
1005 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer)))
1006 != NULL)
1007 {
1008 int len = Ustrlen(s);
1009 if (header_testname(h, s, len, FALSE))
1010 {
1011 h->type = htype_old;
1012 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1013 }
1014 }
1015 }
1016 acl_removed_headers = NULL;
1017 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1018 }
1019
1020 if (acl_added_headers == NULL) return;
1021 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1022
1023 for (h = acl_added_headers; h != NULL; h = next)
1024 {
1025 next = h->next;
1026
1027 switch(h->type)
1028 {
1029 case htype_add_top:
1030 h->next = header_list;
1031 header_list = h;
1032 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1033 break;
1034
1035 case htype_add_rec:
1036 if (last_received == NULL)
1037 {
1038 last_received = header_list;
1039 while (!header_testname(last_received, US"Received", 8, FALSE))
1040 last_received = last_received->next;
1041 while (last_received->next != NULL &&
1042 header_testname(last_received->next, US"Received", 8, FALSE))
1043 last_received = last_received->next;
1044 }
1045 h->next = last_received->next;
1046 last_received->next = h;
1047 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1048 break;
1049
1050 case htype_add_rfc:
1051 /* add header before any header which is NOT Received: or Resent- */
1052 last_received = header_list;
1053 while ( (last_received->next != NULL) &&
1054 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1055 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1056 last_received = last_received->next;
1057 /* last_received now points to the last Received: or Resent-* header
1058 in an uninterrupted chain of those header types (seen from the beginning
1059 of all headers. Our current header must follow it. */
1060 h->next = last_received->next;
1061 last_received->next = h;
1062 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1063 break;
1064
1065 default:
1066 h->next = NULL;
1067 header_last->next = h;
1068 break;
1069 }
1070
1071 if (h->next == NULL) header_last = h;
1072
1073 /* Check for one of the known header types (From:, To:, etc.) though in
1074 practice most added headers are going to be "other". Lower case
1075 identification letters are never stored with the header; they are used
1076 for existence tests when messages are received. So discard any lower case
1077 flag values. */
1078
1079 h->type = header_checkname(h, FALSE);
1080 if (h->type >= 'a') h->type = htype_other;
1081
1082 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1083 }
1084
1085 acl_added_headers = NULL;
1086 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1087 }
1088
1089
1090
1091 /*************************************************
1092 * Add host information for log line *
1093 *************************************************/
1094
1095 /* Called for acceptance and rejecting log lines. This adds information about
1096 the calling host to a string that is being built dynamically.
1097
1098 Arguments:
1099 s the dynamic string
1100 sizeptr points to the size variable
1101 ptrptr points to the pointer variable
1102
1103 Returns: the extended string
1104 */
1105
1106 static uschar *
1107 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1108 {
1109 if (sender_fullhost != NULL)
1110 {
1111 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1112 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1113 interface_address != NULL)
1114 {
1115 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1116 interface_port);
1117 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1118 }
1119 }
1120 if (sender_ident != NULL)
1121 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1122 if (received_protocol != NULL)
1123 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1124 return s;
1125 }
1126
1127
1128
1129 #ifdef WITH_CONTENT_SCAN
1130
1131 /*************************************************
1132 * Run the MIME ACL on a message *
1133 *************************************************/
1134
1135 /* This code is in a subroutine so that it can be used for both SMTP
1136 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1137
1138 Arguments:
1139 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1140 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1141 smtp_reply_ptr Where SMTP reply is being built
1142 blackholed_by_ptr Where "blackholed by" message is being built
1143
1144 Returns: TRUE to carry on; FALSE to abandon the message
1145 */
1146
1147 static BOOL
1148 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1149 uschar **blackholed_by_ptr)
1150 {
1151 FILE *mbox_file;
1152 uschar rfc822_file_path[2048];
1153 unsigned long mbox_size;
1154 header_line *my_headerlist;
1155 uschar *user_msg, *log_msg;
1156 int mime_part_count_buffer = -1;
1157 int rc = OK;
1158
1159 memset(CS rfc822_file_path,0,2048);
1160
1161 /* check if it is a MIME message */
1162 my_headerlist = header_list;
1163 while (my_headerlist != NULL)
1164 {
1165 /* skip deleted headers */
1166 if (my_headerlist->type == '*')
1167 {
1168 my_headerlist = my_headerlist->next;
1169 continue;
1170 }
1171 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1172 {
1173 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1174 goto DO_MIME_ACL;
1175 }
1176 my_headerlist = my_headerlist->next;
1177 }
1178
1179 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1180 return TRUE;
1181
1182 DO_MIME_ACL:
1183 /* make sure the eml mbox file is spooled up */
1184 mbox_file = spool_mbox(&mbox_size, NULL);
1185 if (mbox_file == NULL) {
1186 /* error while spooling */
1187 log_write(0, LOG_MAIN|LOG_PANIC,
1188 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1189 Uunlink(spool_name);
1190 unspool_mbox();
1191 #ifdef EXPERIMENTAL_DCC
1192 dcc_ok = 0;
1193 #endif
1194 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1195 message_id[0] = 0; /* Indicate no message accepted */
1196 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1197 return FALSE; /* Indicate skip to end of receive function */
1198 };
1199
1200 mime_is_rfc822 = 0;
1201
1202 MIME_ACL_CHECK:
1203 mime_part_count = -1;
1204 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1205 (void)fclose(mbox_file);
1206
1207 if (Ustrlen(rfc822_file_path) > 0)
1208 {
1209 mime_part_count = mime_part_count_buffer;
1210
1211 if (unlink(CS rfc822_file_path) == -1)
1212 {
1213 log_write(0, LOG_PANIC,
1214 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1215 goto END_MIME_ACL;
1216 }
1217 }
1218
1219 /* check if we must check any message/rfc822 attachments */
1220 if (rc == OK)
1221 {
1222 uschar temp_path[1024];
1223 int n;
1224 struct dirent *entry;
1225 DIR *tempdir;
1226
1227 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1228 message_id);
1229
1230 tempdir = opendir(CS temp_path);
1231 n = 0;
1232 do
1233 {
1234 entry = readdir(tempdir);
1235 if (entry == NULL) break;
1236 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1237 {
1238 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1239 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1240 break;
1241 }
1242 } while (1);
1243 closedir(tempdir);
1244
1245 if (entry != NULL)
1246 {
1247 mbox_file = Ufopen(rfc822_file_path,"rb");
1248 if (mbox_file == NULL)
1249 {
1250 log_write(0, LOG_PANIC,
1251 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1252 unlink(CS rfc822_file_path);
1253 goto END_MIME_ACL;
1254 }
1255 /* set RFC822 expansion variable */
1256 mime_is_rfc822 = 1;
1257 mime_part_count_buffer = mime_part_count;
1258 goto MIME_ACL_CHECK;
1259 }
1260 }
1261
1262 END_MIME_ACL:
1263 add_acl_headers(US"MIME");
1264 if (rc == DISCARD)
1265 {
1266 recipients_count = 0;
1267 *blackholed_by_ptr = US"MIME ACL";
1268 }
1269 else if (rc != OK)
1270 {
1271 Uunlink(spool_name);
1272 unspool_mbox();
1273 #ifdef EXPERIMENTAL_DCC
1274 dcc_ok = 0;
1275 #endif
1276 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1277 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1278 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1279 message_id[0] = 0; /* Indicate no message accepted */
1280 return FALSE; /* Cause skip to end of receive function */
1281 }
1282
1283 return TRUE;
1284 }
1285
1286 #endif /* WITH_CONTENT_SCAN */
1287
1288
1289
1290 void
1291 received_header_gen(void)
1292 {
1293 uschar *received;
1294 uschar *timestamp;
1295 header_line *received_header= header_list;
1296
1297 timestamp = expand_string(US"${tod_full}");
1298 if (recipients_count == 1) received_for = recipients_list[0].address;
1299 received = expand_string(received_header_text);
1300 received_for = NULL;
1301
1302 if (received == NULL)
1303 {
1304 if(spool_name[0] != 0)
1305 Uunlink(spool_name); /* Lose the data file */
1306 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1307 "(received_header_text) failed: %s", string_printing(received_header_text),
1308 expand_string_message);
1309 }
1310
1311 /* The first element on the header chain is reserved for the Received header,
1312 so all we have to do is fill in the text pointer, and set the type. However, if
1313 the result of the expansion is an empty string, we leave the header marked as
1314 "old" so as to refrain from adding a Received header. */
1315
1316 if (received[0] == 0)
1317 {
1318 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1319 received_header->type = htype_old;
1320 }
1321 else
1322 {
1323 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1324 received_header->type = htype_received;
1325 }
1326
1327 received_header->slen = Ustrlen(received_header->text);
1328
1329 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1330 received_header->type, received_header->text);
1331 }
1332
1333
1334
1335 /*************************************************
1336 * Receive message *
1337 *************************************************/
1338
1339 /* Receive a message on the given input, and put it into a pair of spool files.
1340 Either a non-null list of recipients, or the extract flag will be true, or
1341 both. The flag sender_local is true for locally generated messages. The flag
1342 submission_mode is true if an ACL has obeyed "control = submission". The flag
1343 suppress_local_fixups is true if an ACL has obeyed "control =
1344 suppress_local_fixups" or -G was passed on the command-line.
1345 The flag smtp_input is true if the message is to be
1346 handled using SMTP conventions about termination and lines starting with dots.
1347 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1348
1349 If a message was successfully read, message_id[0] will be non-zero.
1350
1351 The general actions of this function are:
1352
1353 . Read the headers of the message (if any) into a chain of store
1354 blocks.
1355
1356 . If there is a "sender:" header and the message is locally originated,
1357 throw it away, unless the caller is trusted, or unless
1358 active_local_sender_retain is set - which can only happen if
1359 active_local_from_check is false.
1360
1361 . If recipients are to be extracted from the message, build the
1362 recipients list from the headers, removing any that were on the
1363 original recipients list (unless extract_addresses_remove_arguments is
1364 false), and at the same time, remove any bcc header that may be present.
1365
1366 . Get the spool file for the data, sort out its unique name, open
1367 and lock it (but don't give it the name yet).
1368
1369 . Generate a "Message-Id" header if the message doesn't have one, for
1370 locally-originated messages.
1371
1372 . Generate a "Received" header.
1373
1374 . Ensure the recipients list is fully qualified and rewritten if necessary.
1375
1376 . If there are any rewriting rules, apply them to the sender address
1377 and also to the headers.
1378
1379 . If there is no from: header, generate one, for locally-generated messages
1380 and messages in "submission mode" only.
1381
1382 . If the sender is local, check that from: is correct, and if not, generate
1383 a Sender: header, unless message comes from a trusted caller, or this
1384 feature is disabled by active_local_from_check being false.
1385
1386 . If there is no "date" header, generate one, for locally-originated
1387 or submission mode messages only.
1388
1389 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1390 dot_ends mode, to the data file. Leave it open, to hold the lock.
1391
1392 . Write the envelope and the headers to a new file.
1393
1394 . Set the name for the header file; close it.
1395
1396 . Set the name for the data file; close it.
1397
1398 Because this function can potentially be called many times in a single
1399 SMTP connection, all store should be got by store_get(), so that it will be
1400 automatically retrieved after the message is accepted.
1401
1402 FUDGE: It seems that sites on the net send out messages with just LF
1403 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1404 we make the CRs optional in all cases.
1405
1406 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1407 new regime is now in place in which bare CRs in header lines are turned into LF
1408 followed by a space, so as not to terminate the header line.
1409
1410 February 2004: A bare LF in a header line in a message whose first line was
1411 terminated by CRLF is treated in the same way as a bare CR.
1412
1413 Arguments:
1414 extract_recip TRUE if recipients are to be extracted from the message's
1415 headers
1416
1417 Returns: TRUE there are more messages to be read (SMTP input)
1418 FALSE there are no more messages to be read (non-SMTP input
1419 or SMTP connection collapsed, or other failure)
1420
1421 When reading a message for filter testing, the returned value indicates
1422 whether the headers (which is all that is read) were terminated by '.' or
1423 not. */
1424
1425 BOOL
1426 receive_msg(BOOL extract_recip)
1427 {
1428 int i;
1429 int rc = FAIL;
1430 int msg_size = 0;
1431 int process_info_len = Ustrlen(process_info);
1432 int error_rc = (error_handling == ERRORS_SENDER)?
1433 errors_sender_rc : EXIT_FAILURE;
1434 int header_size = 256;
1435 int start, end, domain, size, sptr;
1436 int id_resolution;
1437 int had_zero = 0;
1438 int prevlines_length = 0;
1439
1440 register int ptr = 0;
1441
1442 BOOL contains_resent_headers = FALSE;
1443 BOOL extracted_ignored = FALSE;
1444 BOOL first_line_ended_crlf = TRUE_UNSET;
1445 BOOL smtp_yield = TRUE;
1446 BOOL yield = FALSE;
1447
1448 BOOL resents_exist = FALSE;
1449 uschar *resent_prefix = US"";
1450 uschar *blackholed_by = NULL;
1451 uschar *blackhole_log_msg = US"";
1452 int cutthrough_done = 0;
1453
1454 flock_t lock_data;
1455 error_block *bad_addresses = NULL;
1456
1457 uschar *frozen_by = NULL;
1458 uschar *queued_by = NULL;
1459
1460 uschar *errmsg, *s;
1461 struct stat statbuf;
1462
1463 /* Final message to give to SMTP caller, and messages from ACLs */
1464
1465 uschar *smtp_reply = NULL;
1466 uschar *user_msg, *log_msg;
1467
1468 /* Working header pointers */
1469
1470 header_line *h, *next;
1471
1472 /* Flags for noting the existence of certain headers (only one left) */
1473
1474 BOOL date_header_exists = FALSE;
1475
1476 /* Pointers to receive the addresses of headers whose contents we need. */
1477
1478 header_line *from_header = NULL;
1479 header_line *subject_header = NULL;
1480 header_line *msgid_header = NULL;
1481 header_line *received_header;
1482
1483 /* Variables for use when building the Received: header. */
1484
1485 uschar *timestamp;
1486 int tslen;
1487
1488 /* Release any open files that might have been cached while preparing to
1489 accept the message - e.g. by verifying addresses - because reading a message
1490 might take a fair bit of real time. */
1491
1492 search_tidyup();
1493
1494 /* Extracting the recipient list from an input file is incompatible with
1495 cutthrough delivery with the no-spool option. It shouldn't be possible
1496 to set up the combination, but just in case kill any ongoing connection. */
1497 if (extract_recip || !smtp_input)
1498 cancel_cutthrough_connection("not smtp input");
1499
1500 /* Initialize the chain of headers by setting up a place-holder for Received:
1501 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1502 pointing to the end of the chain to make adding headers simple. */
1503
1504 received_header = header_list = header_last = store_get(sizeof(header_line));
1505 header_list->next = NULL;
1506 header_list->type = htype_old;
1507 header_list->text = NULL;
1508 header_list->slen = 0;
1509
1510 /* Control block for the next header to be read. */
1511
1512 next = store_get(sizeof(header_line));
1513 next->text = store_get(header_size);
1514
1515 /* Initialize message id to be null (indicating no message read), and the
1516 header names list to be the normal list. Indicate there is no data file open
1517 yet, initialize the size and warning count, and deal with no size limit. */
1518
1519 message_id[0] = 0;
1520 data_file = NULL;
1521 data_fd = -1;
1522 spool_name[0] = 0;
1523 message_size = 0;
1524 warning_count = 0;
1525 received_count = 1; /* For the one we will add */
1526
1527 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1528
1529 /* While reading the message, the following counts are computed. */
1530
1531 message_linecount = body_linecount = body_zerocount =
1532 max_received_linelength = 0;
1533
1534 #ifndef DISABLE_DKIM
1535 /* Call into DKIM to set up the context. */
1536 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1537 #endif
1538
1539 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1540 ids, and fractions of a second are required. See the comments that precede the
1541 message id creation below. */
1542
1543 (void)gettimeofday(&message_id_tv, NULL);
1544
1545 /* For other uses of the received time we can operate with granularity of one
1546 second, and for that we use the global variable received_time. This is for
1547 things like ultimate message timeouts. */
1548
1549 received_time = message_id_tv.tv_sec;
1550
1551 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1552 happen in the smtp_getc() function when it refills its buffer. */
1553
1554 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1555
1556 /* If not SMTP input, timeout happens only if configured, and we just set a
1557 single timeout for the whole message. */
1558
1559 else if (receive_timeout > 0)
1560 {
1561 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1562 alarm(receive_timeout);
1563 }
1564
1565 /* SIGTERM and SIGINT are caught always. */
1566
1567 signal(SIGTERM, data_sigterm_sigint_handler);
1568 signal(SIGINT, data_sigterm_sigint_handler);
1569
1570 /* Header lines in messages are not supposed to be very long, though when
1571 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1572 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1573 storing the header, and extend this as necessary using string_cat().
1574
1575 To cope with total lunacies, impose an upper limit on the length of the header
1576 section of the message, as otherwise the store will fill up. We must also cope
1577 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1578 Folded header lines are joined into one string, leaving the '\n' characters
1579 inside them, so that writing them out reproduces the input.
1580
1581 Loop for each character of each header; the next structure for chaining the
1582 header is set up already, with ptr the offset of the next character in
1583 next->text. */
1584
1585 for (;;)
1586 {
1587 int ch = (receive_getc)();
1588
1589 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1590 SMTP must have a correct "." terminator. */
1591
1592 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1593 {
1594 smtp_reply = handle_lost_connection(US" (header)");
1595 smtp_yield = FALSE;
1596 goto TIDYUP; /* Skip to end of function */
1597 }
1598
1599 /* See if we are at the current header's size limit - there must be at least
1600 four bytes left. This allows for the new character plus a zero, plus two for
1601 extra insertions when we are playing games with dots and carriage returns. If
1602 we are at the limit, extend the text buffer. This could have been done
1603 automatically using string_cat() but because this is a tightish loop storing
1604 only one character at a time, we choose to do it inline. Normally
1605 store_extend() will be able to extend the block; only at the end of a big
1606 store block will a copy be needed. To handle the case of very long headers
1607 (and sometimes lunatic messages can have ones that are 100s of K long) we
1608 call store_release() for strings that have been copied - if the string is at
1609 the start of a block (and therefore the only thing in it, because we aren't
1610 doing any other gets), the block gets freed. We can only do this because we
1611 know there are no other calls to store_get() going on. */
1612
1613 if (ptr >= header_size - 4)
1614 {
1615 int oldsize = header_size;
1616 /* header_size += 256; */
1617 header_size *= 2;
1618 if (!store_extend(next->text, oldsize, header_size))
1619 {
1620 uschar *newtext = store_get(header_size);
1621 memcpy(newtext, next->text, ptr);
1622 store_release(next->text);
1623 next->text = newtext;
1624 }
1625 }
1626
1627 /* Cope with receiving a binary zero. There is dispute about whether
1628 these should be allowed in RFC 822 messages. The middle view is that they
1629 should not be allowed in headers, at least. Exim takes this attitude at
1630 the moment. We can't just stomp on them here, because we don't know that
1631 this line is a header yet. Set a flag to cause scanning later. */
1632
1633 if (ch == 0) had_zero++;
1634
1635 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1636 those from data files use just LF. Treat LF in local SMTP input as a
1637 terminator too. Treat EOF as a line terminator always. */
1638
1639 if (ch == EOF) goto EOL;
1640
1641 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1642 other MTAs accept this. We are therefore forced into this "liberalisation"
1643 too, so we accept LF as a line terminator whatever the source of the message.
1644 However, if the first line of the message ended with a CRLF, we treat a bare
1645 LF specially by inserting a white space after it to ensure that the header
1646 line is not terminated. */
1647
1648 if (ch == '\n')
1649 {
1650 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1651 else if (first_line_ended_crlf) receive_ungetc(' ');
1652 goto EOL;
1653 }
1654
1655 /* This is not the end of the line. If this is SMTP input and this is
1656 the first character in the line and it is a "." character, ignore it.
1657 This implements the dot-doubling rule, though header lines starting with
1658 dots aren't exactly common. They are legal in RFC 822, though. If the
1659 following is CRLF or LF, this is the line that that terminates the
1660 entire message. We set message_ended to indicate this has happened (to
1661 prevent further reading), and break out of the loop, having freed the
1662 empty header, and set next = NULL to indicate no data line. */
1663
1664 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1665 {
1666 ch = (receive_getc)();
1667 if (ch == '\r')
1668 {
1669 ch = (receive_getc)();
1670 if (ch != '\n')
1671 {
1672 receive_ungetc(ch);
1673 ch = '\r'; /* Revert to CR */
1674 }
1675 }
1676 if (ch == '\n')
1677 {
1678 message_ended = END_DOT;
1679 store_reset(next);
1680 next = NULL;
1681 break; /* End character-reading loop */
1682 }
1683
1684 /* For non-SMTP input, the dot at the start of the line was really a data
1685 character. What is now in ch is the following character. We guaranteed
1686 enough space for this above. */
1687
1688 if (!smtp_input)
1689 {
1690 next->text[ptr++] = '.';
1691 message_size++;
1692 }
1693 }
1694
1695 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1696 remember this case if this is the first line ending. */
1697
1698 if (ch == '\r')
1699 {
1700 ch = (receive_getc)();
1701 if (ch == '\n')
1702 {
1703 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1704 goto EOL;
1705 }
1706
1707 /* Otherwise, put back the character after CR, and turn the bare CR
1708 into LF SP. */
1709
1710 ch = (receive_ungetc)(ch);
1711 next->text[ptr++] = '\n';
1712 message_size++;
1713 ch = ' ';
1714 }
1715
1716 /* We have a data character for the header line. */
1717
1718 next->text[ptr++] = ch; /* Add to buffer */
1719 message_size++; /* Total message size so far */
1720
1721 /* Handle failure due to a humungously long header section. The >= allows
1722 for the terminating \n. Add what we have so far onto the headers list so
1723 that it gets reflected in any error message, and back up the just-read
1724 character. */
1725
1726 if (message_size >= header_maxsize)
1727 {
1728 next->text[ptr] = 0;
1729 next->slen = ptr;
1730 next->type = htype_other;
1731 next->next = NULL;
1732 header_last->next = next;
1733 header_last = next;
1734
1735 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1736 "%s (more than %d characters): message abandoned",
1737 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1738
1739 if (smtp_input)
1740 {
1741 smtp_reply = US"552 Message header is ridiculously long";
1742 receive_swallow_smtp();
1743 goto TIDYUP; /* Skip to end of function */
1744 }
1745
1746 else
1747 {
1748 give_local_error(ERRMESS_VLONGHEADER,
1749 string_sprintf("message header longer than %d characters received: "
1750 "message not accepted", header_maxsize), US"", error_rc, stdin,
1751 header_list->next);
1752 /* Does not return */
1753 }
1754 }
1755
1756 continue; /* With next input character */
1757
1758 /* End of header line reached */
1759
1760 EOL:
1761
1762 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1763
1764 receive_linecount++;
1765 message_linecount++;
1766
1767 /* Keep track of maximum line length */
1768
1769 if (ptr - prevlines_length > max_received_linelength)
1770 max_received_linelength = ptr - prevlines_length;
1771 prevlines_length = ptr + 1;
1772
1773 /* Now put in the terminating newline. There is always space for
1774 at least two more characters. */
1775
1776 next->text[ptr++] = '\n';
1777 message_size++;
1778
1779 /* A blank line signals the end of the headers; release the unwanted
1780 space and set next to NULL to indicate this. */
1781
1782 if (ptr == 1)
1783 {
1784 store_reset(next);
1785 next = NULL;
1786 break;
1787 }
1788
1789 /* There is data in the line; see if the next input character is a
1790 whitespace character. If it is, we have a continuation of this header line.
1791 There is always space for at least one character at this point. */
1792
1793 if (ch != EOF)
1794 {
1795 int nextch = (receive_getc)();
1796 if (nextch == ' ' || nextch == '\t')
1797 {
1798 next->text[ptr++] = nextch;
1799 message_size++;
1800 continue; /* Iterate the loop */
1801 }
1802 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1803 else ch = EOF; /* Cause main loop to exit at end */
1804 }
1805
1806 /* We have got to the real line end. Terminate the string and release store
1807 beyond it. If it turns out to be a real header, internal binary zeros will
1808 be squashed later. */
1809
1810 next->text[ptr] = 0;
1811 next->slen = ptr;
1812 store_reset(next->text + ptr + 1);
1813
1814 /* Check the running total size against the overall message size limit. We
1815 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1816 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1817 headers - the code to read the body will then also hit the buffer. */
1818
1819 if (message_size > thismessage_size_limit) break;
1820
1821 /* A line that is not syntactically correct for a header also marks
1822 the end of the headers. In this case, we leave next containing the
1823 first data line. This might actually be several lines because of the
1824 continuation logic applied above, but that doesn't matter.
1825
1826 It turns out that smail, and presumably sendmail, accept leading lines
1827 of the form
1828
1829 From ph10 Fri Jan 5 12:35 GMT 1996
1830
1831 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1832 find any documentation of this, but for compatibility it had better be
1833 accepted. Exim restricts it to the case of non-smtp messages, and
1834 treats it as an alternative to the -f command line option. Thus it is
1835 ignored except for trusted users or filter testing. Otherwise it is taken
1836 as the sender address, unless -f was used (sendmail compatibility).
1837
1838 It further turns out that some UUCPs generate the From_line in a different
1839 format, e.g.
1840
1841 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1842
1843 The regex for matching these things is now capable of recognizing both
1844 formats (including 2- and 4-digit years in the latter). In fact, the regex
1845 is now configurable, as is the expansion string to fish out the sender.
1846
1847 Even further on it has been discovered that some broken clients send
1848 these lines in SMTP messages. There is now an option to ignore them from
1849 specified hosts or networks. Sigh. */
1850
1851 if (header_last == header_list &&
1852 (!smtp_input
1853 ||
1854 (sender_host_address != NULL &&
1855 verify_check_host(&ignore_fromline_hosts) == OK)
1856 ||
1857 (sender_host_address == NULL && ignore_fromline_local)
1858 ) &&
1859 regex_match_and_setup(regex_From, next->text, 0, -1))
1860 {
1861 if (!sender_address_forced)
1862 {
1863 uschar *uucp_sender = expand_string(uucp_from_sender);
1864 if (uucp_sender == NULL)
1865 {
1866 log_write(0, LOG_MAIN|LOG_PANIC,
1867 "expansion of \"%s\" failed after matching "
1868 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1869 }
1870 else
1871 {
1872 int start, end, domain;
1873 uschar *errmess;
1874 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1875 &start, &end, &domain, TRUE);
1876 if (newsender != NULL)
1877 {
1878 if (domain == 0 && newsender[0] != 0)
1879 newsender = rewrite_address_qualify(newsender, FALSE);
1880
1881 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1882 {
1883 sender_address = newsender;
1884
1885 if (trusted_caller || filter_test != FTEST_NONE)
1886 {
1887 authenticated_sender = NULL;
1888 originator_name = US"";
1889 sender_local = FALSE;
1890 }
1891
1892 if (filter_test != FTEST_NONE)
1893 printf("Sender taken from \"From \" line\n");
1894 }
1895 }
1896 }
1897 }
1898 }
1899
1900 /* Not a leading "From " line. Check to see if it is a valid header line.
1901 Header names may contain any non-control characters except space and colon,
1902 amazingly. */
1903
1904 else
1905 {
1906 uschar *p = next->text;
1907
1908 /* If not a valid header line, break from the header reading loop, leaving
1909 next != NULL, indicating that it holds the first line of the body. */
1910
1911 if (isspace(*p)) break;
1912 while (mac_isgraph(*p) && *p != ':') p++;
1913 while (isspace(*p)) p++;
1914 if (*p != ':')
1915 {
1916 body_zerocount = had_zero;
1917 break;
1918 }
1919
1920 /* We have a valid header line. If there were any binary zeroes in
1921 the line, stomp on them here. */
1922
1923 if (had_zero > 0)
1924 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1925
1926 /* It is perfectly legal to have an empty continuation line
1927 at the end of a header, but it is confusing to humans
1928 looking at such messages, since it looks like a blank line.
1929 Reduce confusion by removing redundant white space at the
1930 end. We know that there is at least one printing character
1931 (the ':' tested for above) so there is no danger of running
1932 off the end. */
1933
1934 p = next->text + ptr - 2;
1935 for (;;)
1936 {
1937 while (*p == ' ' || *p == '\t') p--;
1938 if (*p != '\n') break;
1939 ptr = (p--) - next->text + 1;
1940 message_size -= next->slen - ptr;
1941 next->text[ptr] = 0;
1942 next->slen = ptr;
1943 }
1944
1945 /* Add the header to the chain */
1946
1947 next->type = htype_other;
1948 next->next = NULL;
1949 header_last->next = next;
1950 header_last = next;
1951
1952 /* Check the limit for individual line lengths. This comes after adding to
1953 the chain so that the failing line is reflected if a bounce is generated
1954 (for a local message). */
1955
1956 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1957 {
1958 log_write(0, LOG_MAIN, "overlong message header line received from "
1959 "%s (more than %d characters): message abandoned",
1960 sender_host_unknown? sender_ident : sender_fullhost,
1961 header_line_maxsize);
1962
1963 if (smtp_input)
1964 {
1965 smtp_reply = US"552 A message header line is too long";
1966 receive_swallow_smtp();
1967 goto TIDYUP; /* Skip to end of function */
1968 }
1969
1970 else
1971 {
1972 give_local_error(ERRMESS_VLONGHDRLINE,
1973 string_sprintf("message header line longer than %d characters "
1974 "received: message not accepted", header_line_maxsize), US"",
1975 error_rc, stdin, header_list->next);
1976 /* Does not return */
1977 }
1978 }
1979
1980 /* Note if any resent- fields exist. */
1981
1982 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1983 {
1984 resents_exist = TRUE;
1985 resent_prefix = US"Resent-";
1986 }
1987 }
1988
1989 /* The line has been handled. If we have hit EOF, break out of the loop,
1990 indicating no pending data line. */
1991
1992 if (ch == EOF) { next = NULL; break; }
1993
1994 /* Set up for the next header */
1995
1996 header_size = 256;
1997 next = store_get(sizeof(header_line));
1998 next->text = store_get(header_size);
1999 ptr = 0;
2000 had_zero = 0;
2001 prevlines_length = 0;
2002 } /* Continue, starting to read the next header */
2003
2004 /* At this point, we have read all the headers into a data structure in main
2005 store. The first header is still the dummy placeholder for the Received: header
2006 we are going to generate a bit later on. If next != NULL, it contains the first
2007 data line - which terminated the headers before reaching a blank line (not the
2008 normal case). */
2009
2010 DEBUG(D_receive)
2011 {
2012 debug_printf(">>Headers received:\n");
2013 for (h = header_list->next; h != NULL; h = h->next)
2014 debug_printf("%s", h->text);
2015 debug_printf("\n");
2016 }
2017
2018 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2019 is dropped immediately after valid headers, the next thing we will see is EOF.
2020 We must test for this specially, as further down the reading of the data is
2021 skipped if already at EOF. */
2022
2023 if (smtp_input && (receive_feof)())
2024 {
2025 smtp_reply = handle_lost_connection(US" (after header)");
2026 smtp_yield = FALSE;
2027 goto TIDYUP; /* Skip to end of function */
2028 }
2029
2030 /* If this is a filter test run and no headers were read, output a warning
2031 in case there is a mistake in the test message. */
2032
2033 if (filter_test != FTEST_NONE && header_list->next == NULL)
2034 printf("Warning: no message headers read\n");
2035
2036
2037 /* Scan the headers to identify them. Some are merely marked for later
2038 processing; some are dealt with here. */
2039
2040 for (h = header_list->next; h != NULL; h = h->next)
2041 {
2042 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2043 if (is_resent) contains_resent_headers = TRUE;
2044
2045 switch (header_checkname(h, is_resent))
2046 {
2047 case htype_bcc:
2048 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2049 break;
2050
2051 case htype_cc:
2052 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2053 break;
2054
2055 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2056
2057 case htype_date:
2058 if (!resents_exist || is_resent) date_header_exists = TRUE;
2059 break;
2060
2061 /* Same comments as about Return-Path: below. */
2062
2063 case htype_delivery_date:
2064 if (delivery_date_remove) h->type = htype_old;
2065 break;
2066
2067 /* Same comments as about Return-Path: below. */
2068
2069 case htype_envelope_to:
2070 if (envelope_to_remove) h->type = htype_old;
2071 break;
2072
2073 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2074 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2075 header consists of just the login id of the user who called Exim, rewrite
2076 it with the gecos field first. Apply this rule to Resent-From: if there
2077 are resent- fields. */
2078
2079 case htype_from:
2080 h->type = htype_from;
2081 if (!resents_exist || is_resent)
2082 {
2083 from_header = h;
2084 if (!smtp_input)
2085 {
2086 int len;
2087 uschar *s = Ustrchr(h->text, ':') + 1;
2088 while (isspace(*s)) s++;
2089 len = h->slen - (s - h->text) - 1;
2090 if (Ustrlen(originator_login) == len &&
2091 strncmpic(s, originator_login, len) == 0)
2092 {
2093 uschar *name = is_resent? US"Resent-From" : US"From";
2094 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2095 originator_login, qualify_domain_sender);
2096 from_header = header_last;
2097 h->type = htype_old;
2098 DEBUG(D_receive|D_rewrite)
2099 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2100 }
2101 }
2102 }
2103 break;
2104
2105 /* Identify the Message-id: header for generating "in-reply-to" in the
2106 autoreply transport. For incoming logging, save any resent- value. In both
2107 cases, take just the first of any multiples. */
2108
2109 case htype_id:
2110 if (msgid_header == NULL && (!resents_exist || is_resent))
2111 {
2112 msgid_header = h;
2113 h->type = htype_id;
2114 }
2115 break;
2116
2117 /* Flag all Received: headers */
2118
2119 case htype_received:
2120 h->type = htype_received;
2121 received_count++;
2122 break;
2123
2124 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2125
2126 case htype_reply_to:
2127 h->type = htype_reply_to;
2128 break;
2129
2130 /* The Return-path: header is supposed to be added to messages when
2131 they leave the SMTP system. We shouldn't receive messages that already
2132 contain Return-path. However, since Exim generates Return-path: on
2133 local delivery, resent messages may well contain it. We therefore
2134 provide an option (which defaults on) to remove any Return-path: headers
2135 on input. Removal actually means flagging as "old", which prevents the
2136 header being transmitted with the message. */
2137
2138 case htype_return_path:
2139 if (return_path_remove) h->type = htype_old;
2140
2141 /* If we are testing a mail filter file, use the value of the
2142 Return-Path: header to set up the return_path variable, which is not
2143 otherwise set. However, remove any <> that surround the address
2144 because the variable doesn't have these. */
2145
2146 if (filter_test != FTEST_NONE)
2147 {
2148 uschar *start = h->text + 12;
2149 uschar *end = start + Ustrlen(start);
2150 while (isspace(*start)) start++;
2151 while (end > start && isspace(end[-1])) end--;
2152 if (*start == '<' && end[-1] == '>')
2153 {
2154 start++;
2155 end--;
2156 }
2157 return_path = string_copyn(start, end - start);
2158 printf("Return-path taken from \"Return-path:\" header line\n");
2159 }
2160 break;
2161
2162 /* If there is a "Sender:" header and the message is locally originated,
2163 and from an untrusted caller and suppress_local_fixups is not set, or if we
2164 are in submission mode for a remote message, mark it "old" so that it will
2165 not be transmitted with the message, unless active_local_sender_retain is
2166 set. (This can only be true if active_local_from_check is false.) If there
2167 are any resent- headers in the message, apply this rule to Resent-Sender:
2168 instead of Sender:. Messages with multiple resent- header sets cannot be
2169 tidily handled. (For this reason, at least one MUA - Pine - turns old
2170 resent- headers into X-resent- headers when resending, leaving just one
2171 set.) */
2172
2173 case htype_sender:
2174 h->type = ((!active_local_sender_retain &&
2175 (
2176 (sender_local && !trusted_caller && !suppress_local_fixups)
2177 || submission_mode
2178 )
2179 ) &&
2180 (!resents_exist||is_resent))?
2181 htype_old : htype_sender;
2182 break;
2183
2184 /* Remember the Subject: header for logging. There is no Resent-Subject */
2185
2186 case htype_subject:
2187 subject_header = h;
2188 break;
2189
2190 /* "To:" gets flagged, and the existence of a recipient header is noted,
2191 whether it's resent- or not. */
2192
2193 case htype_to:
2194 h->type = htype_to;
2195 /****
2196 to_or_cc_header_exists = TRUE;
2197 ****/
2198 break;
2199 }
2200 }
2201
2202 /* Extract recipients from the headers if that is required (the -t option).
2203 Note that this is documented as being done *before* any address rewriting takes
2204 place. There are two possibilities:
2205
2206 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2207 recipients already listed are to be REMOVED from the message. Smail 3 works
2208 like this. We need to build a non-recipients tree for that list, because in
2209 subsequent processing this data is held in a tree and that's what the
2210 spool_write_header() function expects. Make sure that non-recipient addresses
2211 are fully qualified and rewritten if necessary.
2212
2213 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2214 those in the command line arguments (and it is rumoured some other MTAs do
2215 this). Therefore, there is an option to make Exim behave this way.
2216
2217 *** Notes on "Resent-" header lines ***
2218
2219 The presence of resent-headers in the message makes -t horribly ambiguous.
2220 Experiments with sendmail showed that it uses recipients for all resent-
2221 headers, totally ignoring the concept of "sets of resent- headers" as described
2222 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2223 with all the addresses in one instance of each header.
2224
2225 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2226 error for -t if there were resent- headers in the message. However, after a
2227 discussion on the mailing list, I've learned that there are MUAs that use
2228 resent- headers with -t, and also that the stuff about sets of resent- headers
2229 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2230 message with -t and resent- header lines makes sure that only *its* resent-
2231 headers are present; previous ones are often renamed as X-resent- for example.
2232
2233 Consequently, Exim has been changed so that, if any resent- header lines are
2234 present, the recipients are taken from all of the appropriate resent- lines,
2235 and not from the ordinary To:, Cc:, etc. */
2236
2237 if (extract_recip)
2238 {
2239 int rcount = 0;
2240 error_block **bnext = &bad_addresses;
2241
2242 if (extract_addresses_remove_arguments)
2243 {
2244 while (recipients_count-- > 0)
2245 {
2246 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2247 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2248 tree_add_nonrecipient(s);
2249 }
2250 recipients_list = NULL;
2251 recipients_count = recipients_list_max = 0;
2252 }
2253
2254 /* Now scan the headers */
2255
2256 for (h = header_list->next; h != NULL; h = h->next)
2257 {
2258 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2259 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2260 {
2261 uschar *s = Ustrchr(h->text, ':') + 1;
2262 while (isspace(*s)) s++;
2263
2264 parse_allow_group = TRUE; /* Allow address group syntax */
2265
2266 while (*s != 0)
2267 {
2268 uschar *ss = parse_find_address_end(s, FALSE);
2269 uschar *recipient, *errmess, *p, *pp;
2270 int start, end, domain;
2271
2272 /* Check on maximum */
2273
2274 if (recipients_max > 0 && ++rcount > recipients_max)
2275 {
2276 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2277 US"message rejected: ", error_rc, stdin, NULL);
2278 /* Does not return */
2279 }
2280
2281 /* Make a copy of the address, and remove any internal newlines. These
2282 may be present as a result of continuations of the header line. The
2283 white space that follows the newline must not be removed - it is part
2284 of the header. */
2285
2286 pp = recipient = store_get(ss - s + 1);
2287 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2288 *pp = 0;
2289 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2290 &domain, FALSE);
2291
2292 /* Keep a list of all the bad addresses so we can send a single
2293 error message at the end. However, an empty address is not an error;
2294 just ignore it. This can come from an empty group list like
2295
2296 To: Recipients of list:;
2297
2298 If there are no recipients at all, an error will occur later. */
2299
2300 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2301 {
2302 int len = Ustrlen(s);
2303 error_block *b = store_get(sizeof(error_block));
2304 while (len > 0 && isspace(s[len-1])) len--;
2305 b->next = NULL;
2306 b->text1 = string_printing(string_copyn(s, len));
2307 b->text2 = errmess;
2308 *bnext = b;
2309 bnext = &(b->next);
2310 }
2311
2312 /* If the recipient is already in the nonrecipients tree, it must
2313 have appeared on the command line with the option extract_addresses_
2314 remove_arguments set. Do not add it to the recipients, and keep a note
2315 that this has happened, in order to give a better error if there are
2316 no recipients left. */
2317
2318 else if (recipient != NULL)
2319 {
2320 if (tree_search(tree_nonrecipients, recipient) == NULL)
2321 receive_add_recipient(recipient, -1);
2322 else
2323 extracted_ignored = TRUE;
2324 }
2325
2326 /* Move on past this address */
2327
2328 s = ss + (*ss? 1:0);
2329 while (isspace(*s)) s++;
2330 } /* Next address */
2331
2332 parse_allow_group = FALSE; /* Reset group syntax flags */
2333 parse_found_group = FALSE;
2334
2335 /* If this was the bcc: header, mark it "old", which means it
2336 will be kept on the spool, but not transmitted as part of the
2337 message. */
2338
2339 if (h->type == htype_bcc) h->type = htype_old;
2340 } /* For appropriate header line */
2341 } /* For each header line */
2342
2343 }
2344
2345 /* Now build the unique message id. This has changed several times over the
2346 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2347 Retaining all the history in the comment has become too unwieldy - read
2348 previous release sources if you want it.
2349
2350 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2351 The first part is the current time, in seconds. The second part is the current
2352 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2353 can hold a number in the range 0-3843. It used to be a computed sequence
2354 number, but is now the fractional component of the current time in units of
2355 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2356 received, Exim ensures that the timer has ticked at the appropriate level
2357 before proceeding, to avoid duplication if the pid happened to be re-used
2358 within the same time period. It seems likely that most messages will take at
2359 least half a millisecond to be received, so no delay will normally be
2360 necessary. At least for some time...
2361
2362 There is a modification when localhost_number is set. Formerly this was allowed
2363 to be as large as 255. Now it is restricted to the range 0-16, and the final
2364 component of the message id becomes (localhost_number * 200) + fractional time
2365 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2366
2367 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2368 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2369 still allows the tttttt field to hold a large enough number to last for some
2370 more decades, and the final two-digit field can hold numbers up to 1295, which
2371 is enough for milliseconds (instead of 1/2000 of a second).
2372
2373 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2374 pid, so it is probably safe because pids have to be positive. The
2375 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2376 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2377
2378 Note that string_base62() returns its data in a static storage block, so it
2379 must be copied before calling string_base62() again. It always returns exactly
2380 6 characters.
2381
2382 There doesn't seem to be anything in the RFC which requires a message id to
2383 start with a letter, but Smail was changed to ensure this. The external form of
2384 the message id (as supplied by string expansion) therefore starts with an
2385 additional leading 'E'. The spool file names do not include this leading
2386 letter and it is not used internally.
2387
2388 NOTE: If ever the format of message ids is changed, the regular expression for
2389 checking that a string is in this format must be updated in a corresponding
2390 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2391 must also be changed to reflect the correct string length. Then, of course,
2392 other programs that rely on the message id format will need updating too. */
2393
2394 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2395 message_id[6] = '-';
2396 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2397
2398 /* Deal with the case where the host number is set. The value of the number was
2399 checked when it was read, to ensure it isn't too big. The timing granularity is
2400 left in id_resolution so that an appropriate wait can be done after receiving
2401 the message, if necessary (we hope it won't be). */
2402
2403 if (host_number_string != NULL)
2404 {
2405 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2406 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2407 string_base62((long int)(
2408 host_number * (1000000/id_resolution) +
2409 message_id_tv.tv_usec/id_resolution)) + 4);
2410 }
2411
2412 /* Host number not set: final field is just the fractional time at an
2413 appropriate resolution. */
2414
2415 else
2416 {
2417 id_resolution = (BASE_62 == 62)? 500 : 1000;
2418 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2419 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2420 }
2421
2422 /* Add the current message id onto the current process info string if
2423 it will fit. */
2424
2425 (void)string_format(process_info + process_info_len,
2426 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2427
2428 /* If we are using multiple input directories, set up the one for this message
2429 to be the least significant base-62 digit of the time of arrival. Otherwise
2430 ensure that it is an empty string. */
2431
2432 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2433
2434 /* Now that we have the message-id, if there is no message-id: header, generate
2435 one, but only for local (without suppress_local_fixups) or submission mode
2436 messages. This can be user-configured if required, but we had better flatten
2437 any illegal characters therein. */
2438
2439 if (msgid_header == NULL &&
2440 ((sender_host_address == NULL && !suppress_local_fixups)
2441 || submission_mode))
2442 {
2443 uschar *p;
2444 uschar *id_text = US"";
2445 uschar *id_domain = primary_hostname;
2446
2447 /* Permit only letters, digits, dots, and hyphens in the domain */
2448
2449 if (message_id_domain != NULL)
2450 {
2451 uschar *new_id_domain = expand_string(message_id_domain);
2452 if (new_id_domain == NULL)
2453 {
2454 if (!expand_string_forcedfail)
2455 log_write(0, LOG_MAIN|LOG_PANIC,
2456 "expansion of \"%s\" (message_id_header_domain) "
2457 "failed: %s", message_id_domain, expand_string_message);
2458 }
2459 else if (*new_id_domain != 0)
2460 {
2461 id_domain = new_id_domain;
2462 for (p = id_domain; *p != 0; p++)
2463 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2464 }
2465 }
2466
2467 /* Permit all characters except controls and RFC 2822 specials in the
2468 additional text part. */
2469
2470 if (message_id_text != NULL)
2471 {
2472 uschar *new_id_text = expand_string(message_id_text);
2473 if (new_id_text == NULL)
2474 {
2475 if (!expand_string_forcedfail)
2476 log_write(0, LOG_MAIN|LOG_PANIC,
2477 "expansion of \"%s\" (message_id_header_text) "
2478 "failed: %s", message_id_text, expand_string_message);
2479 }
2480 else if (*new_id_text != 0)
2481 {
2482 id_text = new_id_text;
2483 for (p = id_text; *p != 0; p++)
2484 if (mac_iscntrl_or_special(*p)) *p = '-';
2485 }
2486 }
2487
2488 /* Add the header line
2489 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2490 * appended, to preserve classical expectations of header ordering. */
2491
2492 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2493 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2494 (*id_text == 0)? "" : ".", id_text, id_domain);
2495 }
2496
2497 /* If we are to log recipients, keep a copy of the raw ones before any possible
2498 rewriting. Must copy the count, because later ACLs and the local_scan()
2499 function may mess with the real recipients. */
2500
2501 if ((log_extra_selector & LX_received_recipients) != 0)
2502 {
2503 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2504 for (i = 0; i < recipients_count; i++)
2505 raw_recipients[i] = string_copy(recipients_list[i].address);
2506 raw_recipients_count = recipients_count;
2507 }
2508
2509 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2510 recipients will get here only if the conditions were right (allow_unqualified_
2511 recipient is TRUE). */
2512
2513 for (i = 0; i < recipients_count; i++)
2514 recipients_list[i].address =
2515 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2516 global_rewrite_rules, rewrite_existflags);
2517
2518 /* If there is no From: header, generate one for local (without
2519 suppress_local_fixups) or submission_mode messages. If there is no sender
2520 address, but the sender is local or this is a local delivery error, use the
2521 originator login. This shouldn't happen for genuine bounces, but might happen
2522 for autoreplies. The addition of From: must be done *before* checking for the
2523 possible addition of a Sender: header, because untrusted_set_sender allows an
2524 untrusted user to set anything in the envelope (which might then get info
2525 From:) but we still want to ensure a valid Sender: if it is required. */
2526
2527 if (from_header == NULL &&
2528 ((sender_host_address == NULL && !suppress_local_fixups)
2529 || submission_mode))
2530 {
2531 uschar *oname = US"";
2532
2533 /* Use the originator_name if this is a locally submitted message and the
2534 caller is not trusted. For trusted callers, use it only if -F was used to
2535 force its value or if we have a non-SMTP message for which -f was not used
2536 to set the sender. */
2537
2538 if (sender_host_address == NULL)
2539 {
2540 if (!trusted_caller || sender_name_forced ||
2541 (!smtp_input && !sender_address_forced))
2542 oname = originator_name;
2543 }
2544
2545 /* For non-locally submitted messages, the only time we use the originator
2546 name is when it was forced by the /name= option on control=submission. */
2547
2548 else
2549 {
2550 if (submission_name != NULL) oname = submission_name;
2551 }
2552
2553 /* Envelope sender is empty */
2554
2555 if (sender_address[0] == 0)
2556 {
2557 uschar *fromstart, *fromend;
2558
2559 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2560 oname, (oname[0] == 0)? "" : " <");
2561 fromend = (oname[0] == 0)? US"" : US">";
2562
2563 if (sender_local || local_error_message)
2564 {
2565 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2566 local_part_quote(originator_login), qualify_domain_sender,
2567 fromend);
2568 }
2569 else if (submission_mode && authenticated_id != NULL)
2570 {
2571 if (submission_domain == NULL)
2572 {
2573 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2574 local_part_quote(authenticated_id), qualify_domain_sender,
2575 fromend);
2576 }
2577 else if (submission_domain[0] == 0) /* empty => whole address set */
2578 {
2579 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2580 fromend);
2581 }
2582 else
2583 {
2584 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2585 local_part_quote(authenticated_id), submission_domain,
2586 fromend);
2587 }
2588 from_header = header_last; /* To get it checked for Sender: */
2589 }
2590 }
2591
2592 /* There is a non-null envelope sender. Build the header using the original
2593 sender address, before any rewriting that might have been done while
2594 verifying it. */
2595
2596 else
2597 {
2598 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2599 oname,
2600 (oname[0] == 0)? "" : " <",
2601 (sender_address_unrewritten == NULL)?
2602 sender_address : sender_address_unrewritten,
2603 (oname[0] == 0)? "" : ">");
2604
2605 from_header = header_last; /* To get it checked for Sender: */
2606 }
2607 }
2608
2609
2610 /* If the sender is local (without suppress_local_fixups), or if we are in
2611 submission mode and there is an authenticated_id, check that an existing From:
2612 is correct, and if not, generate a Sender: header, unless disabled. Any
2613 previously-existing Sender: header was removed above. Note that sender_local,
2614 as well as being TRUE if the caller of exim is not trusted, is also true if a
2615 trusted caller did not supply a -f argument for non-smtp input. To allow
2616 trusted callers to forge From: without supplying -f, we have to test explicitly
2617 here. If the From: header contains more than one address, then the call to
2618 parse_extract_address fails, and a Sender: header is inserted, as required. */
2619
2620 if (from_header != NULL &&
2621 (active_local_from_check &&
2622 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2623 (submission_mode && authenticated_id != NULL))
2624 ))
2625 {
2626 BOOL make_sender = TRUE;
2627 int start, end, domain;
2628 uschar *errmess;
2629 uschar *from_address =
2630 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2631 &start, &end, &domain, FALSE);
2632 uschar *generated_sender_address;
2633
2634 if (submission_mode)
2635 {
2636 if (submission_domain == NULL)
2637 {
2638 generated_sender_address = string_sprintf("%s@%s",
2639 local_part_quote(authenticated_id), qualify_domain_sender);
2640 }
2641 else if (submission_domain[0] == 0) /* empty => full address */
2642 {
2643 generated_sender_address = string_sprintf("%s",
2644 authenticated_id);
2645 }
2646 else
2647 {
2648 generated_sender_address = string_sprintf("%s@%s",
2649 local_part_quote(authenticated_id), submission_domain);
2650 }
2651 }
2652 else
2653 generated_sender_address = string_sprintf("%s@%s",
2654 local_part_quote(originator_login), qualify_domain_sender);
2655
2656 /* Remove permitted prefixes and suffixes from the local part of the From:
2657 address before doing the comparison with the generated sender. */
2658
2659 if (from_address != NULL)
2660 {
2661 int slen;
2662 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2663
2664 if (at != NULL) *at = 0;
2665 from_address += route_check_prefix(from_address, local_from_prefix);
2666 slen = route_check_suffix(from_address, local_from_suffix);
2667 if (slen > 0)
2668 {
2669 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2670 from_address += slen;
2671 }
2672 if (at != NULL) *at = '@';
2673
2674 if (strcmpic(generated_sender_address, from_address) == 0 ||
2675 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2676 make_sender = FALSE;
2677 }
2678
2679 /* We have to cause the Sender header to be rewritten if there are
2680 appropriate rewriting rules. */
2681
2682 if (make_sender)
2683 {
2684 if (submission_mode && submission_name == NULL)
2685 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2686 generated_sender_address);
2687 else
2688 header_add(htype_sender, "%sSender: %s <%s>\n",
2689 resent_prefix,
2690 submission_mode? submission_name : originator_name,
2691 generated_sender_address);
2692 }
2693
2694 /* Ensure that a non-null envelope sender address corresponds to the
2695 submission mode sender address. */
2696
2697 if (submission_mode && sender_address[0] != 0)
2698 {
2699 if (sender_address_unrewritten == NULL)
2700 sender_address_unrewritten = sender_address;
2701 sender_address = generated_sender_address;
2702 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2703 log_write(L_address_rewrite, LOG_MAIN,
2704 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2705 sender_address_unrewritten, generated_sender_address);
2706 }
2707 }
2708
2709
2710 /* If there are any rewriting rules, apply them to the sender address, unless
2711 it has already been rewritten as part of verification for SMTP input. */
2712
2713 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2714 sender_address[0] != 0)
2715 {
2716 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2717 global_rewrite_rules, rewrite_existflags);
2718 DEBUG(D_receive|D_rewrite)
2719 debug_printf("rewritten sender = %s\n", sender_address);
2720 }
2721
2722
2723 /* The headers must be run through rewrite_header(), because it ensures that
2724 addresses are fully qualified, as well as applying any rewriting rules that may
2725 exist.
2726
2727 Qualification of header addresses in a message from a remote host happens only
2728 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2729 appropriate. For local messages, qualification always happens, unless -bnq is
2730 used to explicitly suppress it. No rewriting is done for an unqualified address
2731 that is left untouched.
2732
2733 We start at the second header, skipping our own Received:. This rewriting is
2734 documented as happening *after* recipient addresses are taken from the headers
2735 by the -t command line option. An added Sender: gets rewritten here. */
2736
2737 for (h = header_list->next; h != NULL; h = h->next)
2738 {
2739 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2740 rewrite_existflags, TRUE);
2741 if (newh != NULL) h = newh;
2742 }
2743
2744
2745 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2746 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2747 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2748 exists, this applies to the set of resent- headers rather than the normal set.
2749
2750 The requirement for a recipient header has been removed in RFC 2822. At this
2751 point in the code, earlier versions of Exim added a To: header for locally
2752 submitted messages, and an empty Bcc: header for others. In the light of the
2753 changes in RFC 2822, this was dropped in November 2003. */
2754
2755
2756 /* If there is no date header, generate one if the message originates locally
2757 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2758 submission mode flag is set. Messages without Date: are not valid, but it seems
2759 to be more confusing if Exim adds one to all remotely-originated messages.
2760 As per Message-Id, we prepend if resending, else append.
2761 */
2762
2763 if (!date_header_exists &&
2764 ((sender_host_address == NULL && !suppress_local_fixups)
2765 || submission_mode))
2766 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2767 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2768
2769 search_tidyup(); /* Free any cached resources */
2770
2771 /* Show the complete set of headers if debugging. Note that the first one (the
2772 new Received:) has not yet been set. */
2773
2774 DEBUG(D_receive)
2775 {
2776 debug_printf(">>Headers after rewriting and local additions:\n");
2777 for (h = header_list->next; h != NULL; h = h->next)
2778 debug_printf("%c %s", h->type, h->text);
2779 debug_printf("\n");
2780 }
2781
2782 /* The headers are now complete in store. If we are running in filter
2783 testing mode, that is all this function does. Return TRUE if the message
2784 ended with a dot. */
2785
2786 if (filter_test != FTEST_NONE)
2787 {
2788 process_info[process_info_len] = 0;
2789 return message_ended == END_DOT;
2790 }
2791
2792 /* Cutthrough delivery:
2793 We have to create the Received header now rather than at the end of reception,
2794 so the timestamp behaviour is a change to the normal case.
2795 XXX Ensure this gets documented XXX.
2796 Having created it, send the headers to the destination.
2797 */
2798 if (cutthrough_fd >= 0)
2799 {
2800 if (received_count > received_headers_max)
2801 {
2802 cancel_cutthrough_connection("too many headers");
2803 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2804 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2805 "Too many \"Received\" headers",
2806 sender_address,
2807 (sender_fullhost == NULL)? "" : " H=",
2808 (sender_fullhost == NULL)? US"" : sender_fullhost,
2809 (sender_ident == NULL)? "" : " U=",
2810 (sender_ident == NULL)? US"" : sender_ident);
2811 message_id[0] = 0; /* Indicate no message accepted */
2812 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2813 goto TIDYUP; /* Skip to end of function */
2814 }
2815 received_header_gen();
2816 add_acl_headers(US"MAIL or RCPT");
2817 (void) cutthrough_headers_send();
2818 }
2819
2820
2821 /* Open a new spool file for the data portion of the message. We need
2822 to access it both via a file descriptor and a stream. Try to make the
2823 directory if it isn't there. Note re use of sprintf: spool_directory
2824 is checked on input to be < 200 characters long. */
2825
2826 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2827 message_id);
2828 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2829 if (data_fd < 0)
2830 {
2831 if (errno == ENOENT)
2832 {
2833 uschar temp[16];
2834 sprintf(CS temp, "input/%s", message_subdir);
2835 if (message_subdir[0] == 0) temp[5] = 0;
2836 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2837 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2838 }
2839 if (data_fd < 0)
2840 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2841 spool_name, strerror(errno));
2842 }
2843
2844 /* Make sure the file's group is the Exim gid, and double-check the mode
2845 because the group setting doesn't always get set automatically. */
2846
2847 if (fchown(data_fd, exim_uid, exim_gid))
2848 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2849 "Failed setting ownership on spool file %s: %s",
2850 spool_name, strerror(errno));
2851 (void)fchmod(data_fd, SPOOL_MODE);
2852
2853 /* We now have data file open. Build a stream for it and lock it. We lock only
2854 the first line of the file (containing the message ID) because otherwise there
2855 are problems when Exim is run under Cygwin (I'm told). See comments in
2856 spool_in.c, where the same locking is done. */
2857
2858 data_file = fdopen(data_fd, "w+");
2859 lock_data.l_type = F_WRLCK;
2860 lock_data.l_whence = SEEK_SET;
2861 lock_data.l_start = 0;
2862 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2863
2864 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2865 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2866 errno, strerror(errno));
2867
2868 /* We have an open, locked data file. Write the message id to it to make it
2869 self-identifying. Then read the remainder of the input of this message and
2870 write it to the data file. If the variable next != NULL, it contains the first
2871 data line (which was read as a header but then turned out not to have the right
2872 format); write it (remembering that it might contain binary zeros). The result
2873 of fwrite() isn't inspected; instead we call ferror() below. */
2874
2875 fprintf(data_file, "%s-D\n", message_id);
2876 if (next != NULL)
2877 {
2878 uschar *s = next->text;
2879 int len = next->slen;
2880 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2881 body_linecount++; /* Assumes only 1 line */
2882 }
2883
2884 /* Note that we might already be at end of file, or the logical end of file
2885 (indicated by '.'), or might have encountered an error while writing the
2886 message id or "next" line. */
2887
2888 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2889 {
2890 if (smtp_input)
2891 {
2892 message_ended = read_message_data_smtp(data_file);
2893 receive_linecount++; /* The terminating "." line */
2894 }
2895 else message_ended = read_message_data(data_file);
2896
2897 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2898 message_linecount += body_linecount;
2899
2900 /* Handle premature termination of SMTP */
2901
2902 if (smtp_input && message_ended == END_EOF)
2903 {
2904 Uunlink(spool_name); /* Lose data file when closed */
2905 cancel_cutthrough_connection("sender closed connection");
2906 message_id[0] = 0; /* Indicate no message accepted */
2907 smtp_reply = handle_lost_connection(US"");
2908 smtp_yield = FALSE;
2909 goto TIDYUP; /* Skip to end of function */
2910 }
2911
2912 /* Handle message that is too big. Don't use host_or_ident() in the log
2913 message; we want to see the ident value even for non-remote messages. */
2914
2915 if (message_ended == END_SIZE)
2916 {
2917 Uunlink(spool_name); /* Lose the data file when closed */
2918 cancel_cutthrough_connection("mail too big");
2919 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2920
2921 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2922 "message too big: read=%d max=%d",
2923 sender_address,
2924 (sender_fullhost == NULL)? "" : " H=",
2925 (sender_fullhost == NULL)? US"" : sender_fullhost,
2926 (sender_ident == NULL)? "" : " U=",
2927 (sender_ident == NULL)? US"" : sender_ident,
2928 message_size,
2929 thismessage_size_limit);
2930
2931 if (smtp_input)
2932 {
2933 smtp_reply = US"552 Message size exceeds maximum permitted";
2934 message_id[0] = 0; /* Indicate no message accepted */
2935 goto TIDYUP; /* Skip to end of function */
2936 }
2937 else
2938 {
2939 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2940 give_local_error(ERRMESS_TOOBIG,
2941 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2942 US"message rejected: ", error_rc, data_file, header_list);
2943 /* Does not return */
2944 }
2945 }
2946 }
2947
2948 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2949 example, there may be some expansion in an ACL that uses a timer.) */
2950
2951 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2952
2953 /* The message body has now been read into the data file. Call fflush() to
2954 empty the buffers in C, and then call fsync() to get the data written out onto
2955 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2956 having to do this). If there was an I/O error on either input or output,
2957 attempt to send an error message, and unlink the spool file. For non-SMTP input
2958 we can then give up. Note that for SMTP input we must swallow the remainder of
2959 the input in cases of output errors, since the far end doesn't expect to see
2960 anything until the terminating dot line is sent. */
2961
2962 if (fflush(data_file) == EOF || ferror(data_file) ||
2963 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2964 {
2965 uschar *msg_errno = US strerror(errno);
2966 BOOL input_error = (receive_ferror)() != 0;
2967 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2968 input_error? "Input read" : "Spool write",
2969 msg_errno,
2970 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2971
2972 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2973 Uunlink(spool_name); /* Lose the data file */
2974 cancel_cutthrough_connection("error writing spoolfile");
2975
2976 if (smtp_input)
2977 {
2978 if (input_error)
2979 smtp_reply = US"451 Error while reading input data";
2980 else
2981 {
2982 smtp_reply = US"451 Error while writing spool file";
2983 receive_swallow_smtp();
2984 }
2985 message_id[0] = 0; /* Indicate no message accepted */
2986 goto TIDYUP; /* Skip to end of function */
2987 }
2988
2989 else
2990 {
2991 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2992 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2993 header_list);
2994 /* Does not return */
2995 }
2996 }
2997
2998
2999 /* No I/O errors were encountered while writing the data file. */
3000
3001 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3002
3003
3004 /* If there were any bad addresses extracted by -t, or there were no recipients
3005 left after -t, send a message to the sender of this message, or write it to
3006 stderr if the error handling option is set that way. Note that there may
3007 legitimately be no recipients for an SMTP message if they have all been removed
3008 by "discard".
3009
3010 We need to rewind the data file in order to read it. In the case of no
3011 recipients or stderr error writing, throw the data file away afterwards, and
3012 exit. (This can't be SMTP, which always ensures there's at least one
3013 syntactically good recipient address.) */
3014
3015 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3016 {
3017 DEBUG(D_receive)
3018 {
3019 if (recipients_count == 0) debug_printf("*** No recipients\n");
3020 if (bad_addresses != NULL)
3021 {
3022 error_block *eblock = bad_addresses;
3023 debug_printf("*** Bad address(es)\n");
3024 while (eblock != NULL)
3025 {
3026 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3027 eblock = eblock->next;
3028 }
3029 }
3030 }
3031
3032 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3033
3034 /* If configured to send errors to the sender, but this fails, force
3035 a failure error code. We use a special one for no recipients so that it
3036 can be detected by the autoreply transport. Otherwise error_rc is set to
3037 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3038 it is EXIT_SUCCESS. */
3039
3040 if (error_handling == ERRORS_SENDER)
3041 {
3042 if (!moan_to_sender(
3043 (bad_addresses == NULL)?
3044 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3045 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3046 bad_addresses, header_list, data_file, FALSE))
3047 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3048 }
3049 else
3050 {
3051 if (bad_addresses == NULL)
3052 {
3053 if (extracted_ignored)
3054 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3055 else
3056 fprintf(stderr, "exim: no recipients in message\n");
3057 }
3058 else
3059 {
3060 fprintf(stderr, "exim: invalid address%s",
3061 (bad_addresses->next == NULL)? ":" : "es:\n");
3062 while (bad_addresses != NULL)
3063 {
3064 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3065 bad_addresses->text2);
3066 bad_addresses = bad_addresses->next;
3067 }
3068 }
3069 }
3070
3071 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3072 {
3073 Uunlink(spool_name);
3074 (void)fclose(data_file);
3075 exim_exit(error_rc);
3076 }
3077 }
3078
3079 /* Data file successfully written. Generate text for the Received: header by
3080 expanding the configured string, and adding a timestamp. By leaving this
3081 operation till now, we ensure that the timestamp is the time that message
3082 reception was completed. However, this is deliberately done before calling the
3083 data ACL and local_scan().
3084
3085 This Received: header may therefore be inspected by the data ACL and by code in
3086 the local_scan() function. When they have run, we update the timestamp to be
3087 the final time of reception.
3088
3089 If there is just one recipient, set up its value in the $received_for variable
3090 for use when we generate the Received: header.
3091
3092 Note: the checking for too many Received: headers is handled by the delivery
3093 code. */
3094 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3095
3096 if (received_header->text == NULL) /* Non-cutthrough case */
3097 {
3098 received_header_gen();
3099
3100 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3101
3102 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3103 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3104
3105 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3106 now, before running the DATA ACL. */
3107
3108 add_acl_headers(US"MAIL or RCPT");
3109 }
3110 else
3111 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3112 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3113
3114 /* If an ACL is specified for checking things at this stage of reception of a
3115 message, run it, unless all the recipients were removed by "discard" in earlier
3116 ACLs. That is the only case in which recipients_count can be zero at this
3117 stage. Set deliver_datafile to point to the data file so that $message_body and
3118 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3119 */
3120
3121 deliver_datafile = data_fd;
3122 user_msg = NULL;
3123
3124 enable_dollar_recipients = TRUE;
3125
3126 if (recipients_count == 0)
3127 {
3128 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3129 }
3130 else
3131 {
3132 /* Handle interactive SMTP messages */
3133
3134 if (smtp_input && !smtp_batched_input)
3135 {
3136
3137 #ifndef DISABLE_DKIM
3138 if (!dkim_disable_verify)
3139 {
3140 /* Finish verification, this will log individual signature results to
3141 the mainlog */
3142 dkim_exim_verify_finish();
3143
3144 /* Check if we must run the DKIM ACL */
3145 if ((acl_smtp_dkim != NULL) &&
3146 (dkim_verify_signers != NULL) &&
3147 (dkim_verify_signers[0] != '\0'))
3148 {
3149 uschar *dkim_verify_signers_expanded =
3150 expand_string(dkim_verify_signers);
3151 if (dkim_verify_signers_expanded == NULL)
3152 {
3153 log_write(0, LOG_MAIN|LOG_PANIC,
3154 "expansion of dkim_verify_signers option failed: %s",
3155 expand_string_message);
3156 }
3157 else
3158 {
3159 int sep = 0;
3160 uschar *ptr = dkim_verify_signers_expanded;
3161 uschar *item = NULL;
3162 uschar *seen_items = NULL;
3163 int seen_items_size = 0;
3164 int seen_items_offset = 0;
3165 uschar itembuf[256];
3166 /* Default to OK when no items are present */
3167 rc = OK;
3168 while ((item = string_nextinlist(&ptr, &sep,
3169 itembuf,
3170 sizeof(itembuf))) != NULL)
3171 {
3172 /* Prevent running ACL for an empty item */
3173 if (!item || (item[0] == '\0')) continue;
3174 /* Only run ACL once for each domain or identity, no matter how often it
3175 appears in the expanded list. */
3176 if (seen_items != NULL)
3177 {
3178 uschar *seen_item = NULL;
3179 uschar seen_item_buf[256];
3180 uschar *seen_items_list = seen_items;
3181 int seen_this_item = 0;
3182
3183 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3184 seen_item_buf,
3185 sizeof(seen_item_buf))) != NULL)
3186 {
3187 if (Ustrcmp(seen_item,item) == 0)
3188 {
3189 seen_this_item = 1;
3190 break;
3191 }
3192 }
3193
3194 if (seen_this_item > 0)
3195 {
3196 DEBUG(D_receive)
3197 debug_printf("acl_smtp_dkim: skipping signer %s, already seen\n", item);
3198 continue;
3199 }
3200
3201 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,":");
3202 }
3203
3204 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,item);
3205 seen_items[seen_items_offset] = '\0';
3206
3207 DEBUG(D_receive)
3208 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n", item);
3209
3210 dkim_exim_acl_setup(item);
3211 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, &user_msg, &log_msg);
3212
3213 if (rc != OK)
3214 {
3215 DEBUG(D_receive)
3216 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, skipping remaining items\n", rc, item);
3217 cancel_cutthrough_connection("dkim acl not ok");
3218 break;
3219 }
3220 }
3221 add_acl_headers(US"DKIM");
3222 if (rc == DISCARD)
3223 {
3224 recipients_count = 0;
3225 blackholed_by = US"DKIM ACL";
3226 if (log_msg != NULL)
3227 blackhole_log_msg = string_sprintf(": %s", log_msg);
3228 }
3229 else if (rc != OK)
3230 {
3231 Uunlink(spool_name);
3232 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3233 smtp_yield = FALSE; /* No more messsages after dropped connection */
3234 smtp_reply = US""; /* Indicate reply already sent */
3235 message_id[0] = 0; /* Indicate no message accepted */
3236 goto TIDYUP; /* Skip to end of function */
3237 }
3238 }
3239 }
3240 }
3241 #endif /* DISABLE_DKIM */
3242
3243 #ifdef WITH_CONTENT_SCAN
3244 if (recipients_count > 0 &&
3245 acl_smtp_mime != NULL &&
3246 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3247 goto TIDYUP;
3248 #endif /* WITH_CONTENT_SCAN */
3249
3250 #ifdef EXPERIMENTAL_PRDR
3251 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr != NULL )
3252 {
3253 unsigned int c;
3254 int all_pass = OK;
3255 int all_fail = FAIL;
3256
3257 smtp_printf("353 PRDR content analysis beginning\r\n");
3258 /* Loop through recipients, responses must be in same order received */
3259 for (c = 0; recipients_count > c; c++)
3260 {
3261 uschar * addr= recipients_list[c].address;
3262 uschar * msg= US"PRDR R=<%s> %s";
3263 uschar * code;
3264 DEBUG(D_receive)
3265 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3266 addr, c+1, recipients_count);
3267 rc = acl_check(ACL_WHERE_PRDR, addr,
3268 acl_smtp_data_prdr, &user_msg, &log_msg);
3269
3270 /* If any recipient rejected content, indicate it in final message */
3271 all_pass |= rc;
3272 /* If all recipients rejected, indicate in final message */
3273 all_fail &= rc;
3274
3275 switch (rc)
3276 {
3277 case OK: case DISCARD: code = US"250"; break;
3278 case DEFER: code = US"450"; break;
3279 default: code = US"550"; break;
3280 }
3281 if (user_msg != NULL)
3282 smtp_user_msg(code, user_msg);
3283 else
3284 {
3285 switch (rc)
3286 {
3287 case OK: case DISCARD:
3288 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3289 case DEFER:
3290 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3291 default:
3292 msg = string_sprintf(CS msg, addr, "refusal"); break;
3293 }
3294 smtp_user_msg(code, msg);
3295 }
3296 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3297 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3298 else log_write(0, LOG_MAIN, CS msg);
3299
3300 if (rc != OK) { receive_remove_recipient(addr); c--; }
3301 }
3302 /* Set up final message, used if data acl gives OK */
3303 smtp_reply = string_sprintf("%s id=%s message %s",
3304 all_fail == FAIL ? US"550" : US"250",
3305 message_id,
3306 all_fail == FAIL
3307 ? US"rejected for all recipients"
3308 : all_pass == OK
3309 ? US"accepted"
3310 : US"accepted for some recipients");
3311 if (recipients_count == 0)
3312 {
3313 message_id[0] = 0; /* Indicate no message accepted */
3314 goto TIDYUP;
3315 }
3316 }
3317 else
3318 prdr_requested = FALSE;
3319 #endif /* EXPERIMENTAL_PRDR */
3320
3321 /* Check the recipients count again, as the MIME ACL might have changed
3322 them. */
3323
3324 if (acl_smtp_data != NULL && recipients_count > 0)
3325 {
3326 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3327 add_acl_headers(US"DATA");
3328 if (rc == DISCARD)
3329 {
3330 recipients_count = 0;
3331 blackholed_by = US"DATA ACL";
3332 if (log_msg != NULL)
3333 blackhole_log_msg = string_sprintf(": %s", log_msg);
3334 cancel_cutthrough_connection("data acl discard");
3335 }
3336 else if (rc != OK)
3337 {
3338 Uunlink(spool_name);
3339 cancel_cutthrough_connection("data acl not ok");
3340 #ifdef WITH_CONTENT_SCAN
3341 unspool_mbox();
3342 #endif
3343 #ifdef EXPERIMENTAL_DCC
3344 dcc_ok = 0;
3345 #endif
3346 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3347 smtp_yield = FALSE; /* No more messsages after dropped connection */
3348 smtp_reply = US""; /* Indicate reply already sent */
3349 message_id[0] = 0; /* Indicate no message accepted */
3350 goto TIDYUP; /* Skip to end of function */
3351 }
3352 }
3353 }
3354
3355 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3356 we cannot take different actions for permanent and temporary rejections. */
3357
3358 else
3359 {
3360
3361 #ifdef WITH_CONTENT_SCAN
3362 if (acl_not_smtp_mime != NULL &&
3363 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3364 &blackholed_by))
3365 goto TIDYUP;
3366 #endif /* WITH_CONTENT_SCAN */
3367
3368 if (acl_not_smtp != NULL)
3369 {
3370 uschar *user_msg, *log_msg;
3371 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3372 if (rc == DISCARD)
3373 {
3374 recipients_count = 0;
3375 blackholed_by = US"non-SMTP ACL";
3376 if (log_msg != NULL)
3377 blackhole_log_msg = string_sprintf(": %s", log_msg);
3378 }
3379 else if (rc != OK)
3380 {
3381 Uunlink(spool_name);
3382 #ifdef WITH_CONTENT_SCAN
3383 unspool_mbox();
3384 #endif
3385 #ifdef EXPERIMENTAL_DCC
3386 dcc_ok = 0;
3387 #endif
3388 /* The ACL can specify where rejections are to be logged, possibly
3389 nowhere. The default is main and reject logs. */
3390
3391 if (log_reject_target != 0)
3392 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3393 sender_address, log_msg);
3394
3395 if (user_msg == NULL) user_msg = US"local configuration problem";
3396 if (smtp_batched_input)
3397 {
3398 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3399 /* Does not return */
3400 }
3401 else
3402 {
3403 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3404 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3405 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3406 header_list);
3407 /* Does not return */
3408 }
3409 }
3410 add_acl_headers(US"non-SMTP");
3411 }
3412 }
3413
3414 /* The applicable ACLs have been run */
3415
3416 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3417 if (queue_only_policy) queued_by = US"ACL";
3418 }
3419
3420 #ifdef WITH_CONTENT_SCAN
3421 unspool_mbox();
3422 #endif
3423
3424 #ifdef EXPERIMENTAL_DCC
3425 dcc_ok = 0;
3426 #endif
3427
3428
3429 /* The final check on the message is to run the scan_local() function. The
3430 version supplied with Exim always accepts, but this is a hook for sysadmins to
3431 supply their own checking code. The local_scan() function is run even when all
3432 the recipients have been discarded. */
3433
3434 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3435
3436 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3437 deleted, and the incident gets logged. */
3438
3439 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3440 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3441 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3442 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3443
3444 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3445 local_scan_timeout);
3446 local_scan_data = NULL;
3447
3448 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3449 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3450 rc = local_scan(data_fd, &local_scan_data);
3451 alarm(0);
3452 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3453
3454 enable_dollar_recipients = FALSE;
3455
3456 store_pool = POOL_MAIN; /* In case changed */
3457 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3458 local_scan_data);
3459
3460 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3461 os_non_restarting_signal(SIGFPE, SIG_DFL);
3462 os_non_restarting_signal(SIGILL, SIG_DFL);
3463 os_non_restarting_signal(SIGBUS, SIG_DFL);
3464
3465 /* The length check is paranoia against some runaway code, and also because
3466 (for a success return) lines in the spool file are read into big_buffer. */
3467
3468 if (local_scan_data != NULL)
3469 {
3470 int len = Ustrlen(local_scan_data);
3471 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3472 local_scan_data = string_copyn(local_scan_data, len);
3473 }
3474
3475 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3476 {
3477 if (!deliver_freeze) /* ACL might have already frozen */
3478 {
3479 deliver_freeze = TRUE;
3480 deliver_frozen_at = time(NULL);
3481 frozen_by = US"local_scan()";
3482 }
3483 rc = LOCAL_SCAN_ACCEPT;
3484 }
3485 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3486 {
3487 if (!queue_only_policy) /* ACL might have already queued */
3488 {
3489 queue_only_policy = TRUE;
3490 queued_by = US"local_scan()";
3491 }
3492 rc = LOCAL_SCAN_ACCEPT;
3493 }
3494
3495 /* Message accepted: remove newlines in local_scan_data because otherwise