2b6143a3244889d56f720040a5a8b9e70bea70fe
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
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 #ifdef EXPERIMENTAL_DMARC
17 # include "dmarc.h"
18 #endif /* EXPERIMENTAL_DMARC */
19
20 /*************************************************
21 * Local static variables *
22 *************************************************/
23
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
27
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
29
30
31 /*************************************************
32 * Non-SMTP character reading functions *
33 *************************************************/
34
35 /* These are the default functions that are set up in the variables such as
36 receive_getc initially. They just call the standard functions, passing stdin as
37 the file. (When SMTP input is occurring, different functions are used by
38 changing the pointer variables.) */
39
40 int
41 stdin_getc(unsigned lim)
42 {
43 return getc(stdin);
44 }
45
46 int
47 stdin_ungetc(int c)
48 {
49 return ungetc(c, stdin);
50 }
51
52 int
53 stdin_feof(void)
54 {
55 return feof(stdin);
56 }
57
58 int
59 stdin_ferror(void)
60 {
61 return ferror(stdin);
62 }
63
64
65
66
67 /*************************************************
68 * Check that a set sender is allowed *
69 *************************************************/
70
71 /* This function is called when a local caller sets an explicit sender address.
72 It checks whether this is permitted, which it is for trusted callers.
73 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74
75 Arguments: the proposed sender address
76 Returns: TRUE for a trusted caller
77 TRUE if the address has been set, untrusted_set_sender has been
78 set, and the address matches something in the list
79 FALSE otherwise
80 */
81
82 BOOL
83 receive_check_set_sender(uschar *newsender)
84 {
85 uschar *qnewsender;
86 if (trusted_caller) return TRUE;
87 if (!newsender || !untrusted_set_sender) return FALSE;
88 qnewsender = Ustrchr(newsender, '@')
89 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
91 }
92
93
94
95
96 /*************************************************
97 * Read space info for a partition *
98 *************************************************/
99
100 /* This function is called by receive_check_fs() below, and also by string
101 expansion for variables such as $spool_space. The field names for the statvfs
102 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
103 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
104 have inodes, and they return -1 for the number available.
105
106 Later: It turns out that some file systems that do not have the concept of
107 inodes return 0 rather than -1. Such systems should also return 0 for the total
108 number of inodes, so we require that to be greater than zero before returning
109 an inode count.
110
111 Arguments:
112 isspool TRUE for spool partition, FALSE for log partition
113 inodeptr address of int to receive inode count; -1 if there isn't one
114
115 Returns: available on-root space, in kilobytes
116 -1 for log partition if there isn't one
117
118 All values are -1 if the STATFS functions are not available.
119 */
120
121 int
122 receive_statvfs(BOOL isspool, int *inodeptr)
123 {
124 #ifdef HAVE_STATFS
125 struct STATVFS statbuf;
126 struct stat dummy;
127 uschar *path;
128 uschar *name;
129 uschar buffer[1024];
130
131 /* The spool directory must always exist. */
132
133 if (isspool)
134 {
135 path = spool_directory;
136 name = US"spool";
137 }
138
139 /* Need to cut down the log file path to the directory, and to ignore any
140 appearance of "syslog" in it. */
141
142 else
143 {
144 int sep = ':'; /* Not variable - outside scripts use */
145 const uschar *p = log_file_path;
146 name = US"log";
147
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
150
151 if (*p == 0) p = US":";
152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
153 if (Ustrcmp(path, "syslog") != 0)
154 break;
155
156 if (path == NULL) /* No log files */
157 {
158 *inodeptr = -1;
159 return -1;
160 }
161
162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
164 subdirectory has been symbolically linked elsewhere. */
165
166 if (path[0] == 0)
167 {
168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
169 path = buffer;
170 }
171 else
172 {
173 uschar *cp;
174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
175 }
176 }
177
178 /* We now have the path; do the business */
179
180 memset(&statbuf, 0, sizeof(statbuf));
181
182 if (STATVFS(CS path, &statbuf) != 0)
183 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
184 { /* Can happen on first run after installation */
185 *inodeptr = -1;
186 return -1;
187 }
188 else
189 {
190 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
191 "%s directory %s: %s", name, path, strerror(errno));
192 smtp_closedown(US"spool or log directory problem");
193 exim_exit(EXIT_FAILURE, NULL);
194 }
195
196 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
197
198 /* Disks are getting huge. Take care with computing the size in kilobytes. */
199
200 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
201
202 #else
203 /* Unable to find partition sizes in this environment. */
204
205 *inodeptr = -1;
206 return -1;
207 #endif
208 }
209
210
211
212
213 /*************************************************
214 * Check space on spool and log partitions *
215 *************************************************/
216
217 /* This function is called before accepting a message; if any thresholds are
218 set, it checks them. If a message_size is supplied, it checks that there is
219 enough space for that size plus the threshold - i.e. that the message won't
220 reduce the space to the threshold. Not all OS have statvfs(); for those that
221 don't, this function always returns TRUE. For some OS the old function and
222 struct name statfs is used; that is handled by a macro, defined in exim.h.
223
224 Arguments:
225 msg_size the (estimated) size of an incoming message
226
227 Returns: FALSE if there isn't enough space, or if the information cannot
228 be obtained
229 TRUE if no check was done or there is enough space
230 */
231
232 BOOL
233 receive_check_fs(int msg_size)
234 {
235 int space, inodes;
236
237 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
238 {
239 space = receive_statvfs(TRUE, &inodes);
240
241 DEBUG(D_receive)
242 debug_printf("spool directory space = %dK inodes = %d "
243 "check_space = %dK inodes = %d msg_size = %d\n",
244 space, inodes, check_spool_space, check_spool_inodes, msg_size);
245
246 if ((space >= 0 && space < check_spool_space) ||
247 (inodes >= 0 && inodes < check_spool_inodes))
248 {
249 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
250 "inodes=%d", space, inodes);
251 return FALSE;
252 }
253 }
254
255 if (check_log_space > 0 || check_log_inodes > 0)
256 {
257 space = receive_statvfs(FALSE, &inodes);
258
259 DEBUG(D_receive)
260 debug_printf("log directory space = %dK inodes = %d "
261 "check_space = %dK inodes = %d\n",
262 space, inodes, check_log_space, check_log_inodes);
263
264 if ((space >= 0 && space < check_log_space) ||
265 (inodes >= 0 && inodes < check_log_inodes))
266 {
267 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
268 "inodes=%d", space, inodes);
269 return FALSE;
270 }
271 }
272
273 return TRUE;
274 }
275
276
277
278 /*************************************************
279 * Bomb out while reading a message *
280 *************************************************/
281
282 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
283 received, or if there is a timeout. A rarer case might be if the log files are
284 screwed up and Exim can't open them to record a message's arrival. Handling
285 that case is done by setting a flag to cause the log functions to call this
286 function if there is an ultimate disaster. That is why it is globally
287 accessible.
288
289 Arguments:
290 reason text reason to pass to the not-quit ACL
291 msg default SMTP response to give if in an SMTP session
292 Returns: it doesn't
293 */
294
295 void
296 receive_bomb_out(uschar *reason, uschar *msg)
297 {
298 static BOOL already_bombing_out;
299 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
300 timeouts, if someone has something slow in their quit ACL. Since the only
301 things we should be doing are to close down cleanly ASAP, on the second
302 pass we also close down stuff that might be opened again, before bypassing
303 the ACL call and exiting. */
304
305 /* If spool_name is set, it contains the name of the data file that is being
306 written. Unlink it before closing so that it cannot be picked up by a delivery
307 process. Ensure that any header file is also removed. */
308
309 if (spool_name[0] != '\0')
310 {
311 Uunlink(spool_name);
312 spool_name[Ustrlen(spool_name) - 1] = 'H';
313 Uunlink(spool_name);
314 spool_name[0] = '\0';
315 }
316
317 /* Now close the file if it is open, either as a fd or a stream. */
318
319 if (data_file != NULL)
320 {
321 (void)fclose(data_file);
322 data_file = NULL;
323 } else if (data_fd >= 0) {
324 (void)close(data_fd);
325 data_fd = -1;
326 }
327
328 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
329 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
330 SMTP response. */
331
332 if (!already_bombing_out)
333 {
334 already_bombing_out = TRUE;
335 if (smtp_input)
336 {
337 if (smtp_batched_input)
338 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
339 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
340 smtp_active_hostname, msg);
341 }
342 }
343
344 /* Exit from the program (non-BSMTP cases) */
345
346 exim_exit(EXIT_FAILURE, NULL);
347 }
348
349
350 /*************************************************
351 * Data read timeout *
352 *************************************************/
353
354 /* Handler function for timeouts that occur while reading the data that
355 comprises a message.
356
357 Argument: the signal number
358 Returns: nothing
359 */
360
361 static void
362 data_timeout_handler(int sig)
363 {
364 uschar *msg = NULL;
365
366 sig = sig; /* Keep picky compilers happy */
367
368 if (smtp_input)
369 {
370 msg = US"SMTP incoming data timeout";
371 log_write(L_lost_incoming_connection,
372 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
373 "from %s F=<%s>",
374 (sender_fullhost != NULL)? sender_fullhost : US"local process",
375 sender_address);
376 }
377 else
378 {
379 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
380 log_write(L_lost_incoming_connection,
381 LOG_MAIN, "timed out while reading local message");
382 }
383
384 receive_bomb_out(US"data-timeout", msg); /* Does not return */
385 }
386
387
388
389 /*************************************************
390 * local_scan() timeout *
391 *************************************************/
392
393 /* Handler function for timeouts that occur while running a local_scan()
394 function.
395
396 Argument: the signal number
397 Returns: nothing
398 */
399
400 static void
401 local_scan_timeout_handler(int sig)
402 {
403 sig = sig; /* Keep picky compilers happy */
404 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
405 "message temporarily rejected (size %d)", message_size);
406 /* Does not return */
407 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
408 }
409
410
411
412 /*************************************************
413 * local_scan() crashed *
414 *************************************************/
415
416 /* Handler function for signals that occur while running a local_scan()
417 function.
418
419 Argument: the signal number
420 Returns: nothing
421 */
422
423 static void
424 local_scan_crash_handler(int sig)
425 {
426 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
427 "signal %d - message temporarily rejected (size %d)", sig, message_size);
428 /* Does not return */
429 receive_bomb_out(US"local-scan-error", US"local verification problem");
430 }
431
432
433 /*************************************************
434 * SIGTERM or SIGINT received *
435 *************************************************/
436
437 /* Handler for SIGTERM or SIGINT signals that occur while reading the
438 data that comprises a message.
439
440 Argument: the signal number
441 Returns: nothing
442 */
443
444 static void
445 data_sigterm_sigint_handler(int sig)
446 {
447 uschar *msg = NULL;
448
449 if (smtp_input)
450 {
451 msg = US"Service not available - SIGTERM or SIGINT received";
452 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
453 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
454 }
455 else
456 {
457 if (filter_test == FTEST_NONE)
458 {
459 fprintf(stderr, "\nexim: %s received - message abandoned\n",
460 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
461 log_write(0, LOG_MAIN, "%s received while reading local message",
462 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
463 }
464 }
465
466 receive_bomb_out(US"signal-exit", msg); /* Does not return */
467 }
468
469
470
471 /*************************************************
472 * Add new recipient to list *
473 *************************************************/
474
475 /* This function builds a list of recipient addresses in argc/argv
476 format.
477
478 Arguments:
479 recipient the next address to add to recipients_list
480 pno parent number for fixed aliases; -1 otherwise
481
482 Returns: nothing
483 */
484
485 void
486 receive_add_recipient(uschar *recipient, int pno)
487 {
488 if (recipients_count >= recipients_list_max)
489 {
490 recipient_item *oldlist = recipients_list;
491 int oldmax = recipients_list_max;
492 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
493 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
494 if (oldlist != NULL)
495 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
496 }
497
498 recipients_list[recipients_count].address = recipient;
499 recipients_list[recipients_count].pno = pno;
500 #ifdef EXPERIMENTAL_BRIGHTMAIL
501 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
502 /* reset optin string pointer for next recipient */
503 bmi_current_optin = NULL;
504 #endif
505 recipients_list[recipients_count].orcpt = NULL;
506 recipients_list[recipients_count].dsn_flags = 0;
507 recipients_list[recipients_count++].errors_to = NULL;
508 }
509
510
511
512
513 /*************************************************
514 * Send user response message *
515 *************************************************/
516
517 /* This function is passed a default response code and a user message. It calls
518 smtp_message_code() to check and possibly modify the response code, and then
519 calls smtp_respond() to transmit the response. I put this into a function
520 just to avoid a lot of repetition.
521
522 Arguments:
523 code the response code
524 user_msg the user message
525
526 Returns: nothing
527 */
528
529 #ifndef DISABLE_PRDR
530 static void
531 smtp_user_msg(uschar *code, uschar *user_msg)
532 {
533 int len = 3;
534 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
535 smtp_respond(code, len, TRUE, user_msg);
536 }
537 #endif
538
539
540
541
542
543 /*************************************************
544 * Remove a recipient from the list *
545 *************************************************/
546
547 /* This function is provided for local_scan() to use.
548
549 Argument:
550 recipient address to remove
551
552 Returns: TRUE if it did remove something; FALSE otherwise
553 */
554
555 BOOL
556 receive_remove_recipient(uschar *recipient)
557 {
558 int count;
559 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
560 recipient);
561 for (count = 0; count < recipients_count; count++)
562 {
563 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
564 {
565 if ((--recipients_count - count) > 0)
566 memmove(recipients_list + count, recipients_list + count + 1,
567 (recipients_count - count)*sizeof(recipient_item));
568 return TRUE;
569 }
570 }
571 return FALSE;
572 }
573
574
575
576
577
578 /*************************************************
579 * Read data portion of a non-SMTP message *
580 *************************************************/
581
582 /* This function is called to read the remainder of a message (following the
583 header) when the input is not from SMTP - we are receiving a local message on
584 a standard input stream. The message is always terminated by EOF, and is also
585 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
586 two cases for maximum efficiency.
587
588 Ensure that the body ends with a newline. This will naturally be the case when
589 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
590 as "sequences of lines" - this of course strictly applies only to SMTP, but
591 deliveries into BSD-type mailbox files also require it. Exim used to have a
592 flag for doing this at delivery time, but as it was always set for all
593 transports, I decided to simplify things by putting the check here instead.
594
595 There is at least one MUA (dtmail) that sends CRLF via this interface, and
596 other programs are known to do this as well. Exim used to have a option for
597 dealing with this: in July 2003, after much discussion, the code has been
598 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
599
600 However, for the case when a dot on a line by itself terminates a message, the
601 only recognized terminating sequences before and after the dot are LF and CRLF.
602 Otherwise, having read EOL . CR, you don't know whether to read another
603 character or not.
604
605 Internally, in messages stored in Exim's spool files, LF is used as the line
606 terminator. Under the new regime, bare CRs will no longer appear in these
607 files.
608
609 Arguments:
610 fout a FILE to which to write the message
611
612 Returns: One of the END_xxx values indicating why it stopped reading
613 */
614
615 static int
616 read_message_data(FILE *fout)
617 {
618 int ch_state;
619 register int ch;
620 register int linelength = 0;
621
622 /* Handle the case when only EOF terminates the message */
623
624 if (!dot_ends)
625 {
626 register int last_ch = '\n';
627
628 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
629 {
630 if (ch == 0) body_zerocount++;
631 if (last_ch == '\r' && ch != '\n')
632 {
633 if (linelength > max_received_linelength)
634 max_received_linelength = linelength;
635 linelength = 0;
636 if (fputc('\n', fout) == EOF) return END_WERROR;
637 message_size++;
638 body_linecount++;
639 }
640 if (ch == '\r') continue;
641
642 if (fputc(ch, fout) == EOF) return END_WERROR;
643 if (ch == '\n')
644 {
645 if (linelength > max_received_linelength)
646 max_received_linelength = linelength;
647 linelength = 0;
648 body_linecount++;
649 }
650 else linelength++;
651 if (++message_size > thismessage_size_limit) return END_SIZE;
652 }
653
654 if (last_ch != '\n')
655 {
656 if (linelength > max_received_linelength)
657 max_received_linelength = linelength;
658 if (fputc('\n', fout) == EOF) return END_WERROR;
659 message_size++;
660 body_linecount++;
661 }
662
663 return END_EOF;
664 }
665
666 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
667
668 ch_state = 1;
669
670 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
671 {
672 if (ch == 0) body_zerocount++;
673 switch (ch_state)
674 {
675 case 0: /* Normal state (previous char written) */
676 if (ch == '\n')
677 {
678 body_linecount++;
679 if (linelength > max_received_linelength)
680 max_received_linelength = linelength;
681 linelength = -1;
682 ch_state = 1;
683 }
684 else if (ch == '\r')
685 { ch_state = 2; continue; }
686 break;
687
688 case 1: /* After written "\n" */
689 if (ch == '.') { ch_state = 3; continue; }
690 if (ch == '\r') { ch_state = 2; continue; }
691 if (ch == '\n') { body_linecount++; linelength = -1; }
692 else ch_state = 0;
693 break;
694
695 case 2:
696 body_linecount++; /* After unwritten "\r" */
697 if (linelength > max_received_linelength)
698 max_received_linelength = linelength;
699 if (ch == '\n')
700 {
701 ch_state = 1;
702 linelength = -1;
703 }
704 else
705 {
706 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
707 if (ch == '\r') continue;
708 ch_state = 0;
709 linelength = 0;
710 }
711 break;
712
713 case 3: /* After "\n." (\n written, dot not) */
714 if (ch == '\n') return END_DOT;
715 if (ch == '\r') { ch_state = 4; continue; }
716 message_size++;
717 linelength++;
718 if (fputc('.', fout) == EOF) return END_WERROR;
719 ch_state = 0;
720 break;
721
722 case 4: /* After "\n.\r" (\n written, rest not) */
723 if (ch == '\n') return END_DOT;
724 message_size += 2;
725 body_linecount++;
726 if (fputs(".\n", fout) == EOF) return END_WERROR;
727 if (ch == '\r') { ch_state = 2; continue; }
728 ch_state = 0;
729 break;
730 }
731
732 linelength++;
733 if (fputc(ch, fout) == EOF) return END_WERROR;
734 if (++message_size > thismessage_size_limit) return END_SIZE;
735 }
736
737 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
738 the message ends with a newline, and we must also write any characters that
739 were saved up while testing for an ending dot. */
740
741 if (ch_state != 1)
742 {
743 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
744 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
745 message_size += Ustrlen(ends[ch_state]);
746 body_linecount++;
747 }
748
749 return END_EOF;
750 }
751
752
753
754
755 /*************************************************
756 * Read data portion of an SMTP message *
757 *************************************************/
758
759 /* This function is called to read the remainder of an SMTP message (after the
760 headers), or to skip over it when an error has occurred. In this case, the
761 output file is passed as NULL.
762
763 If any line begins with a dot, that character is skipped. The input should only
764 be successfully terminated by CR LF . CR LF unless it is local (non-network)
765 SMTP, in which case the CRs are optional, but...
766
767 FUDGE: It seems that sites on the net send out messages with just LF
768 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
769 we make the CRs optional in all cases.
770
771 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
772 well, so that there are no CRs in spooled messages. However, the message
773 terminating dot is not recognized between two bare CRs.
774
775 Arguments:
776 fout a FILE to which to write the message; NULL if skipping
777
778 Returns: One of the END_xxx values indicating why it stopped reading
779 */
780
781 static int
782 read_message_data_smtp(FILE *fout)
783 {
784 int ch_state = 0;
785 int ch;
786 int linelength = 0;
787
788 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
789 {
790 if (ch == 0) body_zerocount++;
791 switch (ch_state)
792 {
793 case 0: /* After LF or CRLF */
794 if (ch == '.')
795 {
796 ch_state = 3;
797 continue; /* Don't ever write . after LF */
798 }
799 ch_state = 1;
800
801 /* Else fall through to handle as normal uschar. */
802
803 case 1: /* Normal state */
804 if (ch == '\n')
805 {
806 ch_state = 0;
807 body_linecount++;
808 if (linelength > max_received_linelength)
809 max_received_linelength = linelength;
810 linelength = -1;
811 }
812 else if (ch == '\r')
813 {
814 ch_state = 2;
815 continue;
816 }
817 break;
818
819 case 2: /* After (unwritten) CR */
820 body_linecount++;
821 if (linelength > max_received_linelength)
822 max_received_linelength = linelength;
823 linelength = -1;
824 if (ch == '\n')
825 {
826 ch_state = 0;
827 }
828 else
829 {
830 message_size++;
831 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
832 cutthrough_data_put_nl();
833 if (ch != '\r') ch_state = 1; else continue;
834 }
835 break;
836
837 case 3: /* After [CR] LF . */
838 if (ch == '\n')
839 return END_DOT;
840 if (ch == '\r')
841 {
842 ch_state = 4;
843 continue;
844 }
845 /* The dot was removed at state 3. For a doubled dot, here, reinstate
846 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
847 and to file below. */
848 if (ch == '.')
849 {
850 uschar c= ch;
851 cutthrough_data_puts(&c, 1);
852 }
853 ch_state = 1;
854 break;
855
856 case 4: /* After [CR] LF . CR */
857 if (ch == '\n') return END_DOT;
858 message_size++;
859 body_linecount++;
860 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
861 cutthrough_data_put_nl();
862 if (ch == '\r')
863 {
864 ch_state = 2;
865 continue;
866 }
867 ch_state = 1;
868 break;
869 }
870
871 /* Add the character to the spool file, unless skipping; then loop for the
872 next. */
873
874 message_size++;
875 linelength++;
876 if (fout)
877 {
878 if (fputc(ch, fout) == EOF) return END_WERROR;
879 if (message_size > thismessage_size_limit) return END_SIZE;
880 }
881 if(ch == '\n')
882 cutthrough_data_put_nl();
883 else
884 {
885 uschar c = ch;
886 cutthrough_data_puts(&c, 1);
887 }
888 }
889
890 /* Fall through here if EOF encountered. This indicates some kind of error,
891 since a correct message is terminated by [CR] LF . [CR] LF. */
892
893 return END_EOF;
894 }
895
896
897
898
899 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
900 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
901 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
902 body_linecount accounting for proper re-expansion for the wire, so use
903 a cut-down version of the state-machine above; we don't need to do leading-dot
904 detection and unstuffing.
905
906 Arguments:
907 fout a FILE to which to write the message; NULL if skipping;
908 must be open for both writing and reading.
909
910 Returns: One of the END_xxx values indicating why it stopped reading
911 */
912
913 static int
914 read_message_bdat_smtp(FILE *fout)
915 {
916 int linelength = 0, ch;
917 enum CH_STATE ch_state = LF_SEEN;
918 BOOL fix_nl = FALSE;
919
920 for(;;)
921 {
922 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
923 {
924 case EOF: return END_EOF;
925 case ERR: return END_PROTOCOL;
926 case EOD:
927 /* Nothing to get from the sender anymore. We check the last
928 character written to the spool.
929
930 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
931 If we would be strict, we would refuse such broken messages.
932 But we are liberal, so we fix it. It would be easy just to append
933 the "\n" to the spool.
934
935 But there are some more things (line counting, message size calculation and such),
936 that would need to be duplicated here. So we simply do some ungetc
937 trickery.
938 */
939 if (fout)
940 {
941 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
942 if (fgetc(fout) == '\n') return END_DOT;
943 }
944
945 if (linelength == -1) /* \r already seen (see below) */
946 {
947 DEBUG(D_receive) debug_printf("Add missing LF\n");
948 bdat_ungetc('\n');
949 continue;
950 }
951 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
952 bdat_ungetc('\r'); /* not even \r was seen */
953 fix_nl = TRUE;
954
955 continue;
956 case '\0': body_zerocount++; break;
957 }
958 switch (ch_state)
959 {
960 case LF_SEEN: /* After LF or CRLF */
961 ch_state = MID_LINE;
962 /* fall through to handle as normal uschar. */
963
964 case MID_LINE: /* Mid-line state */
965 if (ch == '\n')
966 {
967 ch_state = LF_SEEN;
968 body_linecount++;
969 if (linelength > max_received_linelength)
970 max_received_linelength = linelength;
971 linelength = -1;
972 }
973 else if (ch == '\r')
974 {
975 ch_state = CR_SEEN;
976 if (fix_nl) bdat_ungetc('\n');
977 continue; /* don't write CR */
978 }
979 break;
980
981 case CR_SEEN: /* After (unwritten) CR */
982 body_linecount++;
983 if (linelength > max_received_linelength)
984 max_received_linelength = linelength;
985 linelength = -1;
986 if (ch == '\n')
987 ch_state = LF_SEEN;
988 else
989 {
990 message_size++;
991 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
992 cutthrough_data_put_nl();
993 if (ch == '\r') continue; /* don't write CR */
994 ch_state = MID_LINE;
995 }
996 break;
997 }
998
999 /* Add the character to the spool file, unless skipping */
1000
1001 message_size++;
1002 linelength++;
1003 if (fout)
1004 {
1005 if (fputc(ch, fout) == EOF) return END_WERROR;
1006 if (message_size > thismessage_size_limit) return END_SIZE;
1007 }
1008 if(ch == '\n')
1009 cutthrough_data_put_nl();
1010 else
1011 {
1012 uschar c = ch;
1013 cutthrough_data_puts(&c, 1);
1014 }
1015 }
1016 /*NOTREACHED*/
1017 }
1018
1019 static int
1020 read_message_bdat_smtp_wire(FILE *fout)
1021 {
1022 int ch;
1023
1024 /* Remember that this message uses wireformat. */
1025
1026 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1027 fout ? "writing spoolfile in wire format" : "flushing input");
1028 spool_file_wireformat = TRUE;
1029
1030 for (;;)
1031 {
1032 if (chunking_data_left > 0)
1033 {
1034 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1035 uschar * buf = bdat_getbuf(&len);
1036
1037 message_size += len;
1038 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1039 }
1040 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1041 {
1042 case EOF: return END_EOF;
1043 case EOD: return END_DOT;
1044 case ERR: return END_PROTOCOL;
1045
1046 default:
1047 message_size++;
1048 /*XXX not done:
1049 linelength
1050 max_received_linelength
1051 body_linecount
1052 body_zerocount
1053 */
1054 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1055 break;
1056 }
1057 if (message_size > thismessage_size_limit) return END_SIZE;
1058 }
1059 /*NOTREACHED*/
1060 }
1061
1062
1063
1064
1065 /*************************************************
1066 * Swallow SMTP message *
1067 *************************************************/
1068
1069 /* This function is called when there has been some kind of error while reading
1070 an SMTP message, and the remaining data may need to be swallowed. It is global
1071 because it is called from smtp_closedown() to shut down an incoming call
1072 tidily.
1073
1074 Argument: a FILE from which to read the message
1075 Returns: nothing
1076 */
1077
1078 void
1079 receive_swallow_smtp(void)
1080 {
1081 if (message_ended >= END_NOTENDED)
1082 message_ended = chunking_state <= CHUNKING_OFFERED
1083 ? read_message_data_smtp(NULL)
1084 : read_message_bdat_smtp_wire(NULL);
1085 }
1086
1087
1088
1089 /*************************************************
1090 * Handle lost SMTP connection *
1091 *************************************************/
1092
1093 /* This function logs connection loss incidents and generates an appropriate
1094 SMTP response.
1095
1096 Argument: additional data for the message
1097 Returns: the SMTP response
1098 */
1099
1100 static uschar *
1101 handle_lost_connection(uschar *s)
1102 {
1103 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1104 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1105 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1106 return US"421 Lost incoming connection";
1107 }
1108
1109
1110
1111
1112 /*************************************************
1113 * Handle a non-smtp reception error *
1114 *************************************************/
1115
1116 /* This function is called for various errors during the reception of non-SMTP
1117 messages. It either sends a message to the sender of the problem message, or it
1118 writes to the standard error stream.
1119
1120 Arguments:
1121 errcode code for moan_to_sender(), identifying the error
1122 text1 first message text, passed to moan_to_sender()
1123 text2 second message text, used only for stderrr
1124 error_rc code to pass to exim_exit if no problem
1125 f FILE containing body of message (may be stdin)
1126 hptr pointer to instore headers or NULL
1127
1128 Returns: calls exim_exit(), which does not return
1129 */
1130
1131 static void
1132 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1133 FILE *f, header_line *hptr)
1134 {
1135 if (error_handling == ERRORS_SENDER)
1136 {
1137 error_block eblock;
1138 eblock.next = NULL;
1139 eblock.text1 = text1;
1140 eblock.text2 = US"";
1141 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1142 error_rc = EXIT_FAILURE;
1143 }
1144 else
1145 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1146 (void)fclose(f);
1147 exim_exit(error_rc, US"");
1148 }
1149
1150
1151
1152 /*************************************************
1153 * Add header lines set up by ACL *
1154 *************************************************/
1155
1156 /* This function is called to add the header lines that were set up by
1157 statements in an ACL to the list of headers in memory. It is done in two stages
1158 like this, because when the ACL for RCPT is running, the other headers have not
1159 yet been received. This function is called twice; once just before running the
1160 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1161 are visible to the DATA ACL.
1162
1163 Originally these header lines were added at the end. Now there is support for
1164 three different places: top, bottom, and after the Received: header(s). There
1165 will always be at least one Received: header, even if it is marked deleted, and
1166 even if something else has been put in front of it.
1167
1168 Arguments:
1169 acl_name text to identify which ACL
1170
1171 Returns: nothing
1172 */
1173
1174 static void
1175 add_acl_headers(int where, uschar *acl_name)
1176 {
1177 header_line *h, *next;
1178 header_line *last_received = NULL;
1179
1180 switch(where)
1181 {
1182 case ACL_WHERE_DKIM:
1183 case ACL_WHERE_MIME:
1184 case ACL_WHERE_DATA:
1185 if ( cutthrough.fd >= 0 && cutthrough.delivery
1186 && (acl_removed_headers || acl_added_headers))
1187 {
1188 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1189 " will not take effect on cutthrough deliveries");
1190 return;
1191 }
1192 }
1193
1194 if (acl_removed_headers)
1195 {
1196 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1197
1198 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1199 {
1200 const uschar * list = acl_removed_headers;
1201 int sep = ':'; /* This is specified as a colon-separated list */
1202 uschar *s;
1203 uschar buffer[128];
1204
1205 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1206 if (header_testname(h, s, Ustrlen(s), FALSE))
1207 {
1208 h->type = htype_old;
1209 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1210 }
1211 }
1212 acl_removed_headers = NULL;
1213 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1214 }
1215
1216 if (!acl_added_headers) return;
1217 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1218
1219 for (h = acl_added_headers; h; h = next)
1220 {
1221 next = h->next;
1222
1223 switch(h->type)
1224 {
1225 case htype_add_top:
1226 h->next = header_list;
1227 header_list = h;
1228 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1229 break;
1230
1231 case htype_add_rec:
1232 if (last_received == NULL)
1233 {
1234 last_received = header_list;
1235 while (!header_testname(last_received, US"Received", 8, FALSE))
1236 last_received = last_received->next;
1237 while (last_received->next != NULL &&
1238 header_testname(last_received->next, US"Received", 8, FALSE))
1239 last_received = last_received->next;
1240 }
1241 h->next = last_received->next;
1242 last_received->next = h;
1243 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1244 break;
1245
1246 case htype_add_rfc:
1247 /* add header before any header which is NOT Received: or Resent- */
1248 last_received = header_list;
1249 while ( (last_received->next != NULL) &&
1250 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1251 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1252 last_received = last_received->next;
1253 /* last_received now points to the last Received: or Resent-* header
1254 in an uninterrupted chain of those header types (seen from the beginning
1255 of all headers. Our current header must follow it. */
1256 h->next = last_received->next;
1257 last_received->next = h;
1258 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1259 break;
1260
1261 default:
1262 h->next = NULL;
1263 header_last->next = h;
1264 break;
1265 }
1266
1267 if (h->next == NULL) header_last = h;
1268
1269 /* Check for one of the known header types (From:, To:, etc.) though in
1270 practice most added headers are going to be "other". Lower case
1271 identification letters are never stored with the header; they are used
1272 for existence tests when messages are received. So discard any lower case
1273 flag values. */
1274
1275 h->type = header_checkname(h, FALSE);
1276 if (h->type >= 'a') h->type = htype_other;
1277
1278 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", header_last->text);
1279 }
1280
1281 acl_added_headers = NULL;
1282 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1283 }
1284
1285
1286
1287 /*************************************************
1288 * Add host information for log line *
1289 *************************************************/
1290
1291 /* Called for acceptance and rejecting log lines. This adds information about
1292 the calling host to a string that is being built dynamically.
1293
1294 Arguments:
1295 s the dynamic string
1296
1297 Returns: the extended string
1298 */
1299
1300 static gstring *
1301 add_host_info_for_log(gstring * g)
1302 {
1303 if (sender_fullhost)
1304 {
1305 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1306 g = string_catn(g, US" DS", 3);
1307 g = string_append(g, 2, US" H=", sender_fullhost);
1308 if (LOGGING(incoming_interface) && interface_address != NULL)
1309 {
1310 g = string_cat(g,
1311 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1312 }
1313 }
1314 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1315 {
1316 g = string_catn(g, US" TFO", 4);
1317 tcp_in_fastopen_logged = TRUE;
1318 }
1319 if (sender_ident)
1320 g = string_append(g, 2, US" U=", sender_ident);
1321 if (received_protocol)
1322 g = string_append(g, 2, US" P=", received_protocol);
1323 return g;
1324 }
1325
1326
1327
1328 #ifdef WITH_CONTENT_SCAN
1329
1330 /*************************************************
1331 * Run the MIME ACL on a message *
1332 *************************************************/
1333
1334 /* This code is in a subroutine so that it can be used for both SMTP
1335 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1336
1337 Arguments:
1338 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1339 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1340 smtp_reply_ptr Where SMTP reply is being built
1341 blackholed_by_ptr Where "blackholed by" message is being built
1342
1343 Returns: TRUE to carry on; FALSE to abandon the message
1344 */
1345
1346 static BOOL
1347 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1348 uschar **blackholed_by_ptr)
1349 {
1350 FILE *mbox_file;
1351 uschar rfc822_file_path[2048];
1352 unsigned long mbox_size;
1353 header_line *my_headerlist;
1354 uschar *user_msg, *log_msg;
1355 int mime_part_count_buffer = -1;
1356 uschar * mbox_filename;
1357 int rc = OK;
1358
1359 memset(CS rfc822_file_path,0,2048);
1360
1361 /* check if it is a MIME message */
1362
1363 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1364 if ( my_headerlist->type != '*' /* skip deleted headers */
1365 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1366 )
1367 {
1368 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1369 goto DO_MIME_ACL;
1370 }
1371
1372 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1373 return TRUE;
1374
1375 DO_MIME_ACL:
1376
1377 /* make sure the eml mbox file is spooled up */
1378 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1379 { /* error while spooling */
1380 log_write(0, LOG_MAIN|LOG_PANIC,
1381 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1382 Uunlink(spool_name);
1383 unspool_mbox();
1384 #ifdef EXPERIMENTAL_DCC
1385 dcc_ok = 0;
1386 #endif
1387 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1388 message_id[0] = 0; /* Indicate no message accepted */
1389 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1390 return FALSE; /* Indicate skip to end of receive function */
1391 }
1392
1393 mime_is_rfc822 = 0;
1394
1395 MIME_ACL_CHECK:
1396 mime_part_count = -1;
1397 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1398 (void)fclose(mbox_file);
1399
1400 if (Ustrlen(rfc822_file_path) > 0)
1401 {
1402 mime_part_count = mime_part_count_buffer;
1403
1404 if (unlink(CS rfc822_file_path) == -1)
1405 {
1406 log_write(0, LOG_PANIC,
1407 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1408 goto END_MIME_ACL;
1409 }
1410 }
1411
1412 /* check if we must check any message/rfc822 attachments */
1413 if (rc == OK)
1414 {
1415 uschar * scandir;
1416 struct dirent * entry;
1417 DIR * tempdir;
1418
1419 scandir = string_copyn(mbox_filename, Ustrrchr(mbox_filename, '/') - mbox_filename);
1420
1421 tempdir = opendir(CS scandir);
1422 for (;;)
1423 {
1424 if (!(entry = readdir(tempdir)))
1425 break;
1426 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1427 {
1428 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1429 "%s/%s", scandir, entry->d_name);
1430 DEBUG(D_receive) debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1431 rfc822_file_path);
1432 break;
1433 }
1434 }
1435 closedir(tempdir);
1436
1437 if (entry)
1438 {
1439 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1440 {
1441 /* set RFC822 expansion variable */
1442 mime_is_rfc822 = 1;
1443 mime_part_count_buffer = mime_part_count;
1444 goto MIME_ACL_CHECK;
1445 }
1446 log_write(0, LOG_PANIC,
1447 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1448 unlink(CS rfc822_file_path);
1449 }
1450 }
1451
1452 END_MIME_ACL:
1453 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1454 if (rc == DISCARD)
1455 {
1456 recipients_count = 0;
1457 *blackholed_by_ptr = US"MIME ACL";
1458 }
1459 else if (rc != OK)
1460 {
1461 Uunlink(spool_name);
1462 unspool_mbox();
1463 #ifdef EXPERIMENTAL_DCC
1464 dcc_ok = 0;
1465 #endif
1466 if ( smtp_input
1467 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1468 {
1469 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1470 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1471 }
1472 message_id[0] = 0; /* Indicate no message accepted */
1473 return FALSE; /* Cause skip to end of receive function */
1474 }
1475
1476 return TRUE;
1477 }
1478
1479 #endif /* WITH_CONTENT_SCAN */
1480
1481
1482
1483 void
1484 received_header_gen(void)
1485 {
1486 uschar *received;
1487 uschar *timestamp;
1488 header_line *received_header= header_list;
1489
1490 timestamp = expand_string(US"${tod_full}");
1491 if (recipients_count == 1) received_for = recipients_list[0].address;
1492 received = expand_string(received_header_text);
1493 received_for = NULL;
1494
1495 if (!received)
1496 {
1497 if(spool_name[0] != 0)
1498 Uunlink(spool_name); /* Lose the data file */
1499 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1500 "(received_header_text) failed: %s", string_printing(received_header_text),
1501 expand_string_message);
1502 }
1503
1504 /* The first element on the header chain is reserved for the Received header,
1505 so all we have to do is fill in the text pointer, and set the type. However, if
1506 the result of the expansion is an empty string, we leave the header marked as
1507 "old" so as to refrain from adding a Received header. */
1508
1509 if (received[0] == 0)
1510 {
1511 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1512 received_header->type = htype_old;
1513 }
1514 else
1515 {
1516 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1517 received_header->type = htype_received;
1518 }
1519
1520 received_header->slen = Ustrlen(received_header->text);
1521
1522 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1523 received_header->type, received_header->text);
1524 }
1525
1526
1527
1528 /*************************************************
1529 * Receive message *
1530 *************************************************/
1531
1532 /* Receive a message on the given input, and put it into a pair of spool files.
1533 Either a non-null list of recipients, or the extract flag will be true, or
1534 both. The flag sender_local is true for locally generated messages. The flag
1535 submission_mode is true if an ACL has obeyed "control = submission". The flag
1536 suppress_local_fixups is true if an ACL has obeyed "control =
1537 suppress_local_fixups" or -G was passed on the command-line.
1538 The flag smtp_input is true if the message is to be
1539 handled using SMTP conventions about termination and lines starting with dots.
1540 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1541
1542 If a message was successfully read, message_id[0] will be non-zero.
1543
1544 The general actions of this function are:
1545
1546 . Read the headers of the message (if any) into a chain of store
1547 blocks.
1548
1549 . If there is a "sender:" header and the message is locally originated,
1550 throw it away, unless the caller is trusted, or unless
1551 active_local_sender_retain is set - which can only happen if
1552 active_local_from_check is false.
1553
1554 . If recipients are to be extracted from the message, build the
1555 recipients list from the headers, removing any that were on the
1556 original recipients list (unless extract_addresses_remove_arguments is
1557 false), and at the same time, remove any bcc header that may be present.
1558
1559 . Get the spool file for the data, sort out its unique name, open
1560 and lock it (but don't give it the name yet).
1561
1562 . Generate a "Message-Id" header if the message doesn't have one, for
1563 locally-originated messages.
1564
1565 . Generate a "Received" header.
1566
1567 . Ensure the recipients list is fully qualified and rewritten if necessary.
1568
1569 . If there are any rewriting rules, apply them to the sender address
1570 and also to the headers.
1571
1572 . If there is no from: header, generate one, for locally-generated messages
1573 and messages in "submission mode" only.
1574
1575 . If the sender is local, check that from: is correct, and if not, generate
1576 a Sender: header, unless message comes from a trusted caller, or this
1577 feature is disabled by active_local_from_check being false.
1578
1579 . If there is no "date" header, generate one, for locally-originated
1580 or submission mode messages only.
1581
1582 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1583 dot_ends mode, to the data file. Leave it open, to hold the lock.
1584
1585 . Write the envelope and the headers to a new file.
1586
1587 . Set the name for the header file; close it.
1588
1589 . Set the name for the data file; close it.
1590
1591 Because this function can potentially be called many times in a single
1592 SMTP connection, all store should be got by store_get(), so that it will be
1593 automatically retrieved after the message is accepted.
1594
1595 FUDGE: It seems that sites on the net send out messages with just LF
1596 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1597 we make the CRs optional in all cases.
1598
1599 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1600 new regime is now in place in which bare CRs in header lines are turned into LF
1601 followed by a space, so as not to terminate the header line.
1602
1603 February 2004: A bare LF in a header line in a message whose first line was
1604 terminated by CRLF is treated in the same way as a bare CR.
1605
1606 Arguments:
1607 extract_recip TRUE if recipients are to be extracted from the message's
1608 headers
1609
1610 Returns: TRUE there are more messages to be read (SMTP input)
1611 FALSE there are no more messages to be read (non-SMTP input
1612 or SMTP connection collapsed, or other failure)
1613
1614 When reading a message for filter testing, the returned value indicates
1615 whether the headers (which is all that is read) were terminated by '.' or
1616 not. */
1617
1618 BOOL
1619 receive_msg(BOOL extract_recip)
1620 {
1621 int i;
1622 int rc = FAIL;
1623 int msg_size = 0;
1624 int process_info_len = Ustrlen(process_info);
1625 int error_rc = (error_handling == ERRORS_SENDER)?
1626 errors_sender_rc : EXIT_FAILURE;
1627 int header_size = 256;
1628 int start, end, domain;
1629 int id_resolution;
1630 int had_zero = 0;
1631 int prevlines_length = 0;
1632
1633 register int ptr = 0;
1634
1635 BOOL contains_resent_headers = FALSE;
1636 BOOL extracted_ignored = FALSE;
1637 BOOL first_line_ended_crlf = TRUE_UNSET;
1638 BOOL smtp_yield = TRUE;
1639 BOOL yield = FALSE;
1640
1641 BOOL resents_exist = FALSE;
1642 uschar *resent_prefix = US"";
1643 uschar *blackholed_by = NULL;
1644 uschar *blackhole_log_msg = US"";
1645 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1646
1647 flock_t lock_data;
1648 error_block *bad_addresses = NULL;
1649
1650 uschar *frozen_by = NULL;
1651 uschar *queued_by = NULL;
1652
1653 uschar *errmsg;
1654 gstring * g;
1655 struct stat statbuf;
1656
1657 /* Final message to give to SMTP caller, and messages from ACLs */
1658
1659 uschar *smtp_reply = NULL;
1660 uschar *user_msg, *log_msg;
1661
1662 /* Working header pointers */
1663
1664 header_line *h, *next;
1665
1666 /* Flags for noting the existence of certain headers (only one left) */
1667
1668 BOOL date_header_exists = FALSE;
1669
1670 /* Pointers to receive the addresses of headers whose contents we need. */
1671
1672 header_line *from_header = NULL;
1673 header_line *subject_header = NULL;
1674 header_line *msgid_header = NULL;
1675 header_line *received_header;
1676
1677 #ifdef EXPERIMENTAL_DMARC
1678 int dmarc_up = 0;
1679 #endif /* EXPERIMENTAL_DMARC */
1680
1681 /* Variables for use when building the Received: header. */
1682
1683 uschar *timestamp;
1684 int tslen;
1685
1686 /* Release any open files that might have been cached while preparing to
1687 accept the message - e.g. by verifying addresses - because reading a message
1688 might take a fair bit of real time. */
1689
1690 search_tidyup();
1691
1692 /* Extracting the recipient list from an input file is incompatible with
1693 cutthrough delivery with the no-spool option. It shouldn't be possible
1694 to set up the combination, but just in case kill any ongoing connection. */
1695 if (extract_recip || !smtp_input)
1696 cancel_cutthrough_connection(TRUE, US"not smtp input");
1697
1698 /* Initialize the chain of headers by setting up a place-holder for Received:
1699 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1700 pointing to the end of the chain to make adding headers simple. */
1701
1702 received_header = header_list = header_last = store_get(sizeof(header_line));
1703 header_list->next = NULL;
1704 header_list->type = htype_old;
1705 header_list->text = NULL;
1706 header_list->slen = 0;
1707
1708 /* Control block for the next header to be read. */
1709
1710 next = store_get(sizeof(header_line));
1711 next->text = store_get(header_size);
1712
1713 /* Initialize message id to be null (indicating no message read), and the
1714 header names list to be the normal list. Indicate there is no data file open
1715 yet, initialize the size and warning count, and deal with no size limit. */
1716
1717 message_id[0] = 0;
1718 data_file = NULL;
1719 data_fd = -1;
1720 spool_name = US"";
1721 message_size = 0;
1722 warning_count = 0;
1723 received_count = 1; /* For the one we will add */
1724
1725 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1726
1727 /* While reading the message, the following counts are computed. */
1728
1729 message_linecount = body_linecount = body_zerocount =
1730 max_received_linelength = 0;
1731
1732 #ifndef DISABLE_DKIM
1733 /* Call into DKIM to set up the context. In CHUNKING mode
1734 we clear the dot-stuffing flag */
1735 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1736 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1737 #endif
1738
1739 #ifdef EXPERIMENTAL_DMARC
1740 /* initialize libopendmarc */
1741 dmarc_up = dmarc_init();
1742 #endif
1743
1744 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1745 ids, and fractions of a second are required. See the comments that precede the
1746 message id creation below. */
1747
1748 (void)gettimeofday(&message_id_tv, NULL);
1749
1750 /* For other uses of the received time we can operate with granularity of one
1751 second, and for that we use the global variable received_time. This is for
1752 things like ultimate message timeouts.XXX */
1753
1754 received_time = message_id_tv;
1755
1756 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1757 happen in the smtp_getc() function when it refills its buffer. */
1758
1759 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1760
1761 /* If not SMTP input, timeout happens only if configured, and we just set a
1762 single timeout for the whole message. */
1763
1764 else if (receive_timeout > 0)
1765 {
1766 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1767 alarm(receive_timeout);
1768 }
1769
1770 /* SIGTERM and SIGINT are caught always. */
1771
1772 signal(SIGTERM, data_sigterm_sigint_handler);
1773 signal(SIGINT, data_sigterm_sigint_handler);
1774
1775 /* Header lines in messages are not supposed to be very long, though when
1776 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1777 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1778 storing the header, and extend this as necessary using string_cat().
1779
1780 To cope with total lunacies, impose an upper limit on the length of the header
1781 section of the message, as otherwise the store will fill up. We must also cope
1782 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1783 Folded header lines are joined into one string, leaving the '\n' characters
1784 inside them, so that writing them out reproduces the input.
1785
1786 Loop for each character of each header; the next structure for chaining the
1787 header is set up already, with ptr the offset of the next character in
1788 next->text. */
1789
1790 for (;;)
1791 {
1792 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1793
1794 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1795 SMTP must have a correct "." terminator. */
1796
1797 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1798 {
1799 smtp_reply = handle_lost_connection(US" (header)");
1800 smtp_yield = FALSE;
1801 goto TIDYUP; /* Skip to end of function */
1802 }
1803
1804 /* See if we are at the current header's size limit - there must be at least
1805 four bytes left. This allows for the new character plus a zero, plus two for
1806 extra insertions when we are playing games with dots and carriage returns. If
1807 we are at the limit, extend the text buffer. This could have been done
1808 automatically using string_cat() but because this is a tightish loop storing
1809 only one character at a time, we choose to do it inline. Normally
1810 store_extend() will be able to extend the block; only at the end of a big
1811 store block will a copy be needed. To handle the case of very long headers
1812 (and sometimes lunatic messages can have ones that are 100s of K long) we
1813 call store_release() for strings that have been copied - if the string is at
1814 the start of a block (and therefore the only thing in it, because we aren't
1815 doing any other gets), the block gets freed. We can only do this release if
1816 there were no allocations since the once that we want to free. */
1817
1818 if (ptr >= header_size - 4)
1819 {
1820 int oldsize = header_size;
1821 /* header_size += 256; */
1822 header_size *= 2;
1823 if (!store_extend(next->text, oldsize, header_size))
1824 next->text = store_newblock(next->text, header_size, ptr);
1825 }
1826
1827 /* Cope with receiving a binary zero. There is dispute about whether
1828 these should be allowed in RFC 822 messages. The middle view is that they
1829 should not be allowed in headers, at least. Exim takes this attitude at
1830 the moment. We can't just stomp on them here, because we don't know that
1831 this line is a header yet. Set a flag to cause scanning later. */
1832
1833 if (ch == 0) had_zero++;
1834
1835 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1836 those from data files use just LF. Treat LF in local SMTP input as a
1837 terminator too. Treat EOF as a line terminator always. */
1838
1839 if (ch == EOF) goto EOL;
1840
1841 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1842 other MTAs accept this. We are therefore forced into this "liberalisation"
1843 too, so we accept LF as a line terminator whatever the source of the message.
1844 However, if the first line of the message ended with a CRLF, we treat a bare
1845 LF specially by inserting a white space after it to ensure that the header
1846 line is not terminated. */
1847
1848 if (ch == '\n')
1849 {
1850 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1851 else if (first_line_ended_crlf) receive_ungetc(' ');
1852 goto EOL;
1853 }
1854
1855 /* This is not the end of the line. If this is SMTP input and this is
1856 the first character in the line and it is a "." character, ignore it.
1857 This implements the dot-doubling rule, though header lines starting with
1858 dots aren't exactly common. They are legal in RFC 822, though. If the
1859 following is CRLF or LF, this is the line that that terminates the
1860 entire message. We set message_ended to indicate this has happened (to
1861 prevent further reading), and break out of the loop, having freed the
1862 empty header, and set next = NULL to indicate no data line. */
1863
1864 if (ptr == 0 && ch == '.' && dot_ends)
1865 {
1866 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1867 if (ch == '\r')
1868 {
1869 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1870 if (ch != '\n')
1871 {
1872 receive_ungetc(ch);
1873 ch = '\r'; /* Revert to CR */
1874 }
1875 }
1876 if (ch == '\n')
1877 {
1878 message_ended = END_DOT;
1879 store_reset(next);
1880 next = NULL;
1881 break; /* End character-reading loop */
1882 }
1883
1884 /* For non-SMTP input, the dot at the start of the line was really a data
1885 character. What is now in ch is the following character. We guaranteed
1886 enough space for this above. */
1887
1888 if (!smtp_input)
1889 {
1890 next->text[ptr++] = '.';
1891 message_size++;
1892 }
1893 }
1894
1895 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1896 remember this case if this is the first line ending. */
1897
1898 if (ch == '\r')
1899 {
1900 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1901 if (ch == '\n')
1902 {
1903 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1904 goto EOL;
1905 }
1906
1907 /* Otherwise, put back the character after CR, and turn the bare CR
1908 into LF SP. */
1909
1910 ch = (receive_ungetc)(ch);
1911 next->text[ptr++] = '\n';
1912 message_size++;
1913 ch = ' ';
1914 }
1915
1916 /* We have a data character for the header line. */
1917
1918 next->text[ptr++] = ch; /* Add to buffer */
1919 message_size++; /* Total message size so far */
1920
1921 /* Handle failure due to a humungously long header section. The >= allows
1922 for the terminating \n. Add what we have so far onto the headers list so
1923 that it gets reflected in any error message, and back up the just-read
1924 character. */
1925
1926 if (message_size >= header_maxsize)
1927 {
1928 next->text[ptr] = 0;
1929 next->slen = ptr;
1930 next->type = htype_other;
1931 next->next = NULL;
1932 header_last->next = next;
1933 header_last = next;
1934
1935 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1936 "%s (more than %d characters): message abandoned",
1937 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1938
1939 if (smtp_input)
1940 {
1941 smtp_reply = US"552 Message header is ridiculously long";
1942 receive_swallow_smtp();
1943 goto TIDYUP; /* Skip to end of function */
1944 }
1945
1946 else
1947 {
1948 give_local_error(ERRMESS_VLONGHEADER,
1949 string_sprintf("message header longer than %d characters received: "
1950 "message not accepted", header_maxsize), US"", error_rc, stdin,
1951 header_list->next);
1952 /* Does not return */
1953 }
1954 }
1955
1956 continue; /* With next input character */
1957
1958 /* End of header line reached */
1959
1960 EOL:
1961
1962 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1963
1964 receive_linecount++;
1965 message_linecount++;
1966
1967 /* Keep track of maximum line length */
1968
1969 if (ptr - prevlines_length > max_received_linelength)
1970 max_received_linelength = ptr - prevlines_length;
1971 prevlines_length = ptr + 1;
1972
1973 /* Now put in the terminating newline. There is always space for
1974 at least two more characters. */
1975
1976 next->text[ptr++] = '\n';
1977 message_size++;
1978
1979 /* A blank line signals the end of the headers; release the unwanted
1980 space and set next to NULL to indicate this. */
1981
1982 if (ptr == 1)
1983 {
1984 store_reset(next);
1985 next = NULL;
1986 break;
1987 }
1988
1989 /* There is data in the line; see if the next input character is a
1990 whitespace character. If it is, we have a continuation of this header line.
1991 There is always space for at least one character at this point. */
1992
1993 if (ch != EOF)
1994 {
1995 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1996 if (nextch == ' ' || nextch == '\t')
1997 {
1998 next->text[ptr++] = nextch;
1999 message_size++;
2000 continue; /* Iterate the loop */
2001 }
2002 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2003 else ch = EOF; /* Cause main loop to exit at end */
2004 }
2005
2006 /* We have got to the real line end. Terminate the string and release store
2007 beyond it. If it turns out to be a real header, internal binary zeros will
2008 be squashed later. */
2009
2010 next->text[ptr] = 0;
2011 next->slen = ptr;
2012 store_reset(next->text + ptr + 1);
2013
2014 /* Check the running total size against the overall message size limit. We
2015 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2016 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2017 headers - the code to read the body will then also hit the buffer. */
2018
2019 if (message_size > thismessage_size_limit) break;
2020
2021 /* A line that is not syntactically correct for a header also marks
2022 the end of the headers. In this case, we leave next containing the
2023 first data line. This might actually be several lines because of the
2024 continuation logic applied above, but that doesn't matter.
2025
2026 It turns out that smail, and presumably sendmail, accept leading lines
2027 of the form
2028
2029 From ph10 Fri Jan 5 12:35 GMT 1996
2030
2031 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2032 find any documentation of this, but for compatibility it had better be
2033 accepted. Exim restricts it to the case of non-smtp messages, and
2034 treats it as an alternative to the -f command line option. Thus it is
2035 ignored except for trusted users or filter testing. Otherwise it is taken
2036 as the sender address, unless -f was used (sendmail compatibility).
2037
2038 It further turns out that some UUCPs generate the From_line in a different
2039 format, e.g.
2040
2041 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2042
2043 The regex for matching these things is now capable of recognizing both
2044 formats (including 2- and 4-digit years in the latter). In fact, the regex
2045 is now configurable, as is the expansion string to fish out the sender.
2046
2047 Even further on it has been discovered that some broken clients send
2048 these lines in SMTP messages. There is now an option to ignore them from
2049 specified hosts or networks. Sigh. */
2050
2051 if ( header_last == header_list
2052 && ( !smtp_input
2053 || ( sender_host_address
2054 && verify_check_host(&ignore_fromline_hosts) == OK
2055 )
2056 || (!sender_host_address && ignore_fromline_local)
2057 )
2058 && regex_match_and_setup(regex_From, next->text, 0, -1)
2059 )
2060 {
2061 if (!sender_address_forced)
2062 {
2063 uschar *uucp_sender = expand_string(uucp_from_sender);
2064 if (!uucp_sender)
2065 log_write(0, LOG_MAIN|LOG_PANIC,
2066 "expansion of \"%s\" failed after matching "
2067 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2068 else
2069 {
2070 int start, end, domain;
2071 uschar *errmess;
2072 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2073 &start, &end, &domain, TRUE);
2074 if (newsender)
2075 {
2076 if (domain == 0 && newsender[0] != 0)
2077 newsender = rewrite_address_qualify(newsender, FALSE);
2078
2079 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2080 {
2081 sender_address = newsender;
2082
2083 if (trusted_caller || filter_test != FTEST_NONE)
2084 {
2085 authenticated_sender = NULL;
2086 originator_name = US"";
2087 sender_local = FALSE;
2088 }
2089
2090 if (filter_test != FTEST_NONE)
2091 printf("Sender taken from \"From \" line\n");
2092 }
2093 }
2094 }
2095 }
2096 }
2097
2098 /* Not a leading "From " line. Check to see if it is a valid header line.
2099 Header names may contain any non-control characters except space and colon,
2100 amazingly. */
2101
2102 else
2103 {
2104 uschar *p = next->text;
2105
2106 /* If not a valid header line, break from the header reading loop, leaving
2107 next != NULL, indicating that it holds the first line of the body. */
2108
2109 if (isspace(*p)) break;
2110 while (mac_isgraph(*p) && *p != ':') p++;
2111 while (isspace(*p)) p++;
2112 if (*p != ':')
2113 {
2114 body_zerocount = had_zero;
2115 break;
2116 }
2117
2118 /* We have a valid header line. If there were any binary zeroes in
2119 the line, stomp on them here. */
2120
2121 if (had_zero > 0)
2122 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2123
2124 /* It is perfectly legal to have an empty continuation line
2125 at the end of a header, but it is confusing to humans
2126 looking at such messages, since it looks like a blank line.
2127 Reduce confusion by removing redundant white space at the
2128 end. We know that there is at least one printing character
2129 (the ':' tested for above) so there is no danger of running
2130 off the end. */
2131
2132 p = next->text + ptr - 2;
2133 for (;;)
2134 {
2135 while (*p == ' ' || *p == '\t') p--;
2136 if (*p != '\n') break;
2137 ptr = (p--) - next->text + 1;
2138 message_size -= next->slen - ptr;
2139 next->text[ptr] = 0;
2140 next->slen = ptr;
2141 }
2142
2143 /* Add the header to the chain */
2144
2145 next->type = htype_other;
2146 next->next = NULL;
2147 header_last->next = next;
2148 header_last = next;
2149
2150 /* Check the limit for individual line lengths. This comes after adding to
2151 the chain so that the failing line is reflected if a bounce is generated
2152 (for a local message). */
2153
2154 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2155 {
2156 log_write(0, LOG_MAIN, "overlong message header line received from "
2157 "%s (more than %d characters): message abandoned",
2158 sender_host_unknown? sender_ident : sender_fullhost,
2159 header_line_maxsize);
2160
2161 if (smtp_input)
2162 {
2163 smtp_reply = US"552 A message header line is too long";
2164 receive_swallow_smtp();
2165 goto TIDYUP; /* Skip to end of function */
2166 }
2167
2168 else
2169 give_local_error(ERRMESS_VLONGHDRLINE,
2170 string_sprintf("message header line longer than %d characters "
2171 "received: message not accepted", header_line_maxsize), US"",
2172 error_rc, stdin, header_list->next);
2173 /* Does not return */
2174 }
2175
2176 /* Note if any resent- fields exist. */
2177
2178 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2179 {
2180 resents_exist = TRUE;
2181 resent_prefix = US"Resent-";
2182 }
2183 }
2184
2185 /* Reject CHUNKING messages that do not CRLF their first header line */
2186
2187 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2188 {
2189 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2190 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2191 sender_address,
2192 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2193 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2194 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2195 bdat_flush_data();
2196 smtp_reply = US"";
2197 goto TIDYUP; /* Skip to end of function */
2198 }
2199
2200 /* The line has been handled. If we have hit EOF, break out of the loop,
2201 indicating no pending data line. */
2202
2203 if (ch == EOF) { next = NULL; break; }
2204
2205 /* Set up for the next header */
2206
2207 header_size = 256;
2208 next = store_get(sizeof(header_line));
2209 next->text = store_get(header_size);
2210 ptr = 0;
2211 had_zero = 0;
2212 prevlines_length = 0;
2213 } /* Continue, starting to read the next header */
2214
2215 /* At this point, we have read all the headers into a data structure in main
2216 store. The first header is still the dummy placeholder for the Received: header
2217 we are going to generate a bit later on. If next != NULL, it contains the first
2218 data line - which terminated the headers before reaching a blank line (not the
2219 normal case). */
2220
2221 DEBUG(D_receive)
2222 {
2223 debug_printf(">>Headers received:\n");
2224 for (h = header_list->next; h; h = h->next)
2225 debug_printf("%s", h->text);
2226 debug_printf("\n");
2227 }
2228
2229 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2230 is dropped immediately after valid headers, the next thing we will see is EOF.
2231 We must test for this specially, as further down the reading of the data is
2232 skipped if already at EOF. */
2233
2234 if (smtp_input && (receive_feof)())
2235 {
2236 smtp_reply = handle_lost_connection(US" (after header)");
2237 smtp_yield = FALSE;
2238 goto TIDYUP; /* Skip to end of function */
2239 }
2240
2241 /* If this is a filter test run and no headers were read, output a warning
2242 in case there is a mistake in the test message. */
2243
2244 if (filter_test != FTEST_NONE && header_list->next == NULL)
2245 printf("Warning: no message headers read\n");
2246
2247
2248 /* Scan the headers to identify them. Some are merely marked for later
2249 processing; some are dealt with here. */
2250
2251 for (h = header_list->next; h; h = h->next)
2252 {
2253 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2254 if (is_resent) contains_resent_headers = TRUE;
2255
2256 switch (header_checkname(h, is_resent))
2257 {
2258 case htype_bcc:
2259 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2260 break;
2261
2262 case htype_cc:
2263 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2264 break;
2265
2266 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2267
2268 case htype_date:
2269 if (!resents_exist || is_resent) date_header_exists = TRUE;
2270 break;
2271
2272 /* Same comments as about Return-Path: below. */
2273
2274 case htype_delivery_date:
2275 if (delivery_date_remove) h->type = htype_old;
2276 break;
2277
2278 /* Same comments as about Return-Path: below. */
2279
2280 case htype_envelope_to:
2281 if (envelope_to_remove) h->type = htype_old;
2282 break;
2283
2284 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2285 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2286 header consists of just the login id of the user who called Exim, rewrite
2287 it with the gecos field first. Apply this rule to Resent-From: if there
2288 are resent- fields. */
2289
2290 case htype_from:
2291 h->type = htype_from;
2292 if (!resents_exist || is_resent)
2293 {
2294 from_header = h;
2295 if (!smtp_input)
2296 {
2297 int len;
2298 uschar *s = Ustrchr(h->text, ':') + 1;
2299 while (isspace(*s)) s++;
2300 len = h->slen - (s - h->text) - 1;
2301 if (Ustrlen(originator_login) == len &&
2302 strncmpic(s, originator_login, len) == 0)
2303 {
2304 uschar *name = is_resent? US"Resent-From" : US"From";
2305 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2306 originator_login, qualify_domain_sender);
2307 from_header = header_last;
2308 h->type = htype_old;
2309 DEBUG(D_receive|D_rewrite)
2310 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2311 }
2312 }
2313 }
2314 break;
2315
2316 /* Identify the Message-id: header for generating "in-reply-to" in the
2317 autoreply transport. For incoming logging, save any resent- value. In both
2318 cases, take just the first of any multiples. */
2319
2320 case htype_id:
2321 if (msgid_header == NULL && (!resents_exist || is_resent))
2322 {
2323 msgid_header = h;
2324 h->type = htype_id;
2325 }
2326 break;
2327
2328 /* Flag all Received: headers */
2329
2330 case htype_received:
2331 h->type = htype_received;
2332 received_count++;
2333 break;
2334
2335 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2336
2337 case htype_reply_to:
2338 h->type = htype_reply_to;
2339 break;
2340
2341 /* The Return-path: header is supposed to be added to messages when
2342 they leave the SMTP system. We shouldn't receive messages that already
2343 contain Return-path. However, since Exim generates Return-path: on
2344 local delivery, resent messages may well contain it. We therefore
2345 provide an option (which defaults on) to remove any Return-path: headers
2346 on input. Removal actually means flagging as "old", which prevents the
2347 header being transmitted with the message. */
2348
2349 case htype_return_path:
2350 if (return_path_remove) h->type = htype_old;
2351
2352 /* If we are testing a mail filter file, use the value of the
2353 Return-Path: header to set up the return_path variable, which is not
2354 otherwise set. However, remove any <> that surround the address
2355 because the variable doesn't have these. */
2356
2357 if (filter_test != FTEST_NONE)
2358 {
2359 uschar *start = h->text + 12;
2360 uschar *end = start + Ustrlen(start);
2361 while (isspace(*start)) start++;
2362 while (end > start && isspace(end[-1])) end--;
2363 if (*start == '<' && end[-1] == '>')
2364 {
2365 start++;
2366 end--;
2367 }
2368 return_path = string_copyn(start, end - start);
2369 printf("Return-path taken from \"Return-path:\" header line\n");
2370 }
2371 break;
2372
2373 /* If there is a "Sender:" header and the message is locally originated,
2374 and from an untrusted caller and suppress_local_fixups is not set, or if we
2375 are in submission mode for a remote message, mark it "old" so that it will
2376 not be transmitted with the message, unless active_local_sender_retain is
2377 set. (This can only be true if active_local_from_check is false.) If there
2378 are any resent- headers in the message, apply this rule to Resent-Sender:
2379 instead of Sender:. Messages with multiple resent- header sets cannot be
2380 tidily handled. (For this reason, at least one MUA - Pine - turns old
2381 resent- headers into X-resent- headers when resending, leaving just one
2382 set.) */
2383
2384 case htype_sender:
2385 h->type = ((!active_local_sender_retain &&
2386 (
2387 (sender_local && !trusted_caller && !suppress_local_fixups)
2388 || submission_mode
2389 )
2390 ) &&
2391 (!resents_exist||is_resent))?
2392 htype_old : htype_sender;
2393 break;
2394
2395 /* Remember the Subject: header for logging. There is no Resent-Subject */
2396
2397 case htype_subject:
2398 subject_header = h;
2399 break;
2400
2401 /* "To:" gets flagged, and the existence of a recipient header is noted,
2402 whether it's resent- or not. */
2403
2404 case htype_to:
2405 h->type = htype_to;
2406 /****
2407 to_or_cc_header_exists = TRUE;
2408 ****/
2409 break;
2410 }
2411 }
2412
2413 /* Extract recipients from the headers if that is required (the -t option).
2414 Note that this is documented as being done *before* any address rewriting takes
2415 place. There are two possibilities:
2416
2417 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2418 recipients already listed are to be REMOVED from the message. Smail 3 works
2419 like this. We need to build a non-recipients tree for that list, because in
2420 subsequent processing this data is held in a tree and that's what the
2421 spool_write_header() function expects. Make sure that non-recipient addresses
2422 are fully qualified and rewritten if necessary.
2423
2424 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2425 those in the command line arguments (and it is rumoured some other MTAs do
2426 this). Therefore, there is an option to make Exim behave this way.
2427
2428 *** Notes on "Resent-" header lines ***
2429
2430 The presence of resent-headers in the message makes -t horribly ambiguous.
2431 Experiments with sendmail showed that it uses recipients for all resent-
2432 headers, totally ignoring the concept of "sets of resent- headers" as described
2433 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2434 with all the addresses in one instance of each header.
2435
2436 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2437 error for -t if there were resent- headers in the message. However, after a
2438 discussion on the mailing list, I've learned that there are MUAs that use
2439 resent- headers with -t, and also that the stuff about sets of resent- headers
2440 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2441 message with -t and resent- header lines makes sure that only *its* resent-
2442 headers are present; previous ones are often renamed as X-resent- for example.
2443
2444 Consequently, Exim has been changed so that, if any resent- header lines are
2445 present, the recipients are taken from all of the appropriate resent- lines,
2446 and not from the ordinary To:, Cc:, etc. */
2447
2448 if (extract_recip)
2449 {
2450 int rcount = 0;
2451 error_block **bnext = &bad_addresses;
2452
2453 if (extract_addresses_remove_arguments)
2454 {
2455 while (recipients_count-- > 0)
2456 {
2457 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2458 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2459 tree_add_nonrecipient(s);
2460 }
2461 recipients_list = NULL;
2462 recipients_count = recipients_list_max = 0;
2463 }
2464
2465 /* Now scan the headers */
2466
2467 for (h = header_list->next; h; h = h->next)
2468 {
2469 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2470 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2471 {
2472 uschar *s = Ustrchr(h->text, ':') + 1;
2473 while (isspace(*s)) s++;
2474
2475 parse_allow_group = TRUE; /* Allow address group syntax */
2476
2477 while (*s != 0)
2478 {
2479 uschar *ss = parse_find_address_end(s, FALSE);
2480 uschar *recipient, *errmess, *p, *pp;
2481 int start, end, domain;
2482
2483 /* Check on maximum */
2484
2485 if (recipients_max > 0 && ++rcount > recipients_max)
2486 {
2487 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2488 US"message rejected: ", error_rc, stdin, NULL);
2489 /* Does not return */
2490 }
2491
2492 /* Make a copy of the address, and remove any internal newlines. These
2493 may be present as a result of continuations of the header line. The
2494 white space that follows the newline must not be removed - it is part
2495 of the header. */
2496
2497 pp = recipient = store_get(ss - s + 1);
2498 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2499 *pp = 0;
2500
2501 #ifdef SUPPORT_I18N
2502 {
2503 BOOL b = allow_utf8_domains;
2504 allow_utf8_domains = TRUE;
2505 #endif
2506 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2507 &domain, FALSE);
2508
2509 #ifdef SUPPORT_I18N
2510 if (string_is_utf8(recipient))
2511 message_smtputf8 = TRUE;
2512 else
2513 allow_utf8_domains = b;
2514 }
2515 #endif
2516
2517 /* Keep a list of all the bad addresses so we can send a single
2518 error message at the end. However, an empty address is not an error;
2519 just ignore it. This can come from an empty group list like
2520
2521 To: Recipients of list:;
2522
2523 If there are no recipients at all, an error will occur later. */
2524
2525 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2526 {
2527 int len = Ustrlen(s);
2528 error_block *b = store_get(sizeof(error_block));
2529 while (len > 0 && isspace(s[len-1])) len--;
2530 b->next = NULL;
2531 b->text1 = string_printing(string_copyn(s, len));
2532 b->text2 = errmess;
2533 *bnext = b;
2534 bnext = &(b->next);
2535 }
2536
2537 /* If the recipient is already in the nonrecipients tree, it must
2538 have appeared on the command line with the option extract_addresses_
2539 remove_arguments set. Do not add it to the recipients, and keep a note
2540 that this has happened, in order to give a better error if there are
2541 no recipients left. */
2542
2543 else if (recipient != NULL)
2544 {
2545 if (tree_search(tree_nonrecipients, recipient) == NULL)
2546 receive_add_recipient(recipient, -1);
2547 else
2548 extracted_ignored = TRUE;
2549 }
2550
2551 /* Move on past this address */
2552
2553 s = ss + (*ss? 1:0);
2554 while (isspace(*s)) s++;
2555 } /* Next address */
2556
2557 parse_allow_group = FALSE; /* Reset group syntax flags */
2558 parse_found_group = FALSE;
2559
2560 /* If this was the bcc: header, mark it "old", which means it
2561 will be kept on the spool, but not transmitted as part of the
2562 message. */
2563
2564 if (h->type == htype_bcc) h->type = htype_old;
2565 } /* For appropriate header line */
2566 } /* For each header line */
2567
2568 }
2569
2570 /* Now build the unique message id. This has changed several times over the
2571 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2572 Retaining all the history in the comment has become too unwieldy - read
2573 previous release sources if you want it.
2574
2575 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2576 The first part is the current time, in seconds. The second part is the current
2577 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2578 can hold a number in the range 0-3843. It used to be a computed sequence
2579 number, but is now the fractional component of the current time in units of
2580 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2581 received, Exim ensures that the timer has ticked at the appropriate level
2582 before proceeding, to avoid duplication if the pid happened to be re-used
2583 within the same time period. It seems likely that most messages will take at
2584 least half a millisecond to be received, so no delay will normally be
2585 necessary. At least for some time...
2586
2587 There is a modification when localhost_number is set. Formerly this was allowed
2588 to be as large as 255. Now it is restricted to the range 0-16, and the final
2589 component of the message id becomes (localhost_number * 200) + fractional time
2590 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2591
2592 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2593 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2594 still allows the tttttt field to hold a large enough number to last for some
2595 more decades, and the final two-digit field can hold numbers up to 1295, which
2596 is enough for milliseconds (instead of 1/2000 of a second).
2597
2598 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2599 pid, so it is probably safe because pids have to be positive. The
2600 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2601 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2602
2603 Note that string_base62() returns its data in a static storage block, so it
2604 must be copied before calling string_base62() again. It always returns exactly
2605 6 characters.
2606
2607 There doesn't seem to be anything in the RFC which requires a message id to
2608 start with a letter, but Smail was changed to ensure this. The external form of
2609 the message id (as supplied by string expansion) therefore starts with an
2610 additional leading 'E'. The spool file names do not include this leading
2611 letter and it is not used internally.
2612
2613 NOTE: If ever the format of message ids is changed, the regular expression for
2614 checking that a string is in this format must be updated in a corresponding
2615 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2616 must also be changed to reflect the correct string length. The queue-sort code
2617 needs to know the layout. Then, of course, other programs that rely on the
2618 message id format will need updating too. */
2619
2620 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2621 message_id[6] = '-';
2622 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2623
2624 /* Deal with the case where the host number is set. The value of the number was
2625 checked when it was read, to ensure it isn't too big. The timing granularity is
2626 left in id_resolution so that an appropriate wait can be done after receiving
2627 the message, if necessary (we hope it won't be). */
2628
2629 if (host_number_string != NULL)
2630 {
2631 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2632 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2633 string_base62((long int)(
2634 host_number * (1000000/id_resolution) +
2635 message_id_tv.tv_usec/id_resolution)) + 4);
2636 }
2637
2638 /* Host number not set: final field is just the fractional time at an
2639 appropriate resolution. */
2640
2641 else
2642 {
2643 id_resolution = (BASE_62 == 62)? 500 : 1000;
2644 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2645 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2646 }
2647
2648 /* Add the current message id onto the current process info string if
2649 it will fit. */
2650
2651 (void)string_format(process_info + process_info_len,
2652 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2653
2654 /* If we are using multiple input directories, set up the one for this message
2655 to be the least significant base-62 digit of the time of arrival. Otherwise
2656 ensure that it is an empty string. */
2657
2658 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2659
2660 /* Now that we have the message-id, if there is no message-id: header, generate
2661 one, but only for local (without suppress_local_fixups) or submission mode
2662 messages. This can be user-configured if required, but we had better flatten
2663 any illegal characters therein. */
2664
2665 if (msgid_header == NULL &&
2666 ((sender_host_address == NULL && !suppress_local_fixups)
2667 || submission_mode))
2668 {
2669 uschar *p;
2670 uschar *id_text = US"";
2671 uschar *id_domain = primary_hostname;
2672
2673 /* Permit only letters, digits, dots, and hyphens in the domain */
2674
2675 if (message_id_domain != NULL)
2676 {
2677 uschar *new_id_domain = expand_string(message_id_domain);
2678 if (new_id_domain == NULL)
2679 {
2680 if (!expand_string_forcedfail)
2681 log_write(0, LOG_MAIN|LOG_PANIC,
2682 "expansion of \"%s\" (message_id_header_domain) "
2683 "failed: %s", message_id_domain, expand_string_message);
2684 }
2685 else if (*new_id_domain != 0)
2686 {
2687 id_domain = new_id_domain;
2688 for (p = id_domain; *p != 0; p++)
2689 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2690 }
2691 }
2692
2693 /* Permit all characters except controls and RFC 2822 specials in the
2694 additional text part. */
2695
2696 if (message_id_text != NULL)
2697 {
2698 uschar *new_id_text = expand_string(message_id_text);
2699 if (new_id_text == NULL)
2700 {
2701 if (!expand_string_forcedfail)
2702 log_write(0, LOG_MAIN|LOG_PANIC,
2703 "expansion of \"%s\" (message_id_header_text) "
2704 "failed: %s", message_id_text, expand_string_message);
2705 }
2706 else if (*new_id_text != 0)
2707 {
2708 id_text = new_id_text;
2709 for (p = id_text; *p != 0; p++)
2710 if (mac_iscntrl_or_special(*p)) *p = '-';
2711 }
2712 }
2713
2714 /* Add the header line
2715 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2716 * appended, to preserve classical expectations of header ordering. */
2717
2718 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2719 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2720 (*id_text == 0)? "" : ".", id_text, id_domain);
2721 }
2722
2723 /* If we are to log recipients, keep a copy of the raw ones before any possible
2724 rewriting. Must copy the count, because later ACLs and the local_scan()
2725 function may mess with the real recipients. */
2726
2727 if (LOGGING(received_recipients))
2728 {
2729 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2730 for (i = 0; i < recipients_count; i++)
2731 raw_recipients[i] = string_copy(recipients_list[i].address);
2732 raw_recipients_count = recipients_count;
2733 }
2734
2735 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2736 recipients will get here only if the conditions were right (allow_unqualified_
2737 recipient is TRUE). */
2738
2739 for (i = 0; i < recipients_count; i++)
2740 recipients_list[i].address =
2741 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2742 global_rewrite_rules, rewrite_existflags);
2743
2744 /* If there is no From: header, generate one for local (without
2745 suppress_local_fixups) or submission_mode messages. If there is no sender
2746 address, but the sender is local or this is a local delivery error, use the
2747 originator login. This shouldn't happen for genuine bounces, but might happen
2748 for autoreplies. The addition of From: must be done *before* checking for the
2749 possible addition of a Sender: header, because untrusted_set_sender allows an
2750 untrusted user to set anything in the envelope (which might then get info
2751 From:) but we still want to ensure a valid Sender: if it is required. */
2752
2753 if (from_header == NULL &&
2754 ((sender_host_address == NULL && !suppress_local_fixups)
2755 || submission_mode))
2756 {
2757 uschar *oname = US"";
2758
2759 /* Use the originator_name if this is a locally submitted message and the
2760 caller is not trusted. For trusted callers, use it only if -F was used to
2761 force its value or if we have a non-SMTP message for which -f was not used
2762 to set the sender. */
2763
2764 if (sender_host_address == NULL)
2765 {
2766 if (!trusted_caller || sender_name_forced ||
2767 (!smtp_input && !sender_address_forced))
2768 oname = originator_name;
2769 }
2770
2771 /* For non-locally submitted messages, the only time we use the originator
2772 name is when it was forced by the /name= option on control=submission. */
2773
2774 else
2775 {
2776 if (submission_name != NULL) oname = submission_name;
2777 }
2778
2779 /* Envelope sender is empty */
2780
2781 if (sender_address[0] == 0)
2782 {
2783 uschar *fromstart, *fromend;
2784
2785 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2786 oname, (oname[0] == 0)? "" : " <");
2787 fromend = (oname[0] == 0)? US"" : US">";
2788
2789 if (sender_local || local_error_message)
2790 {
2791 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2792 local_part_quote(originator_login), qualify_domain_sender,
2793 fromend);
2794 }
2795 else if (submission_mode && authenticated_id != NULL)
2796 {
2797 if (submission_domain == NULL)
2798 {
2799 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2800 local_part_quote(authenticated_id), qualify_domain_sender,
2801 fromend);
2802 }
2803 else if (submission_domain[0] == 0) /* empty => whole address set */
2804 {
2805 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2806 fromend);
2807 }
2808 else
2809 {
2810 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2811 local_part_quote(authenticated_id), submission_domain,
2812 fromend);
2813 }
2814 from_header = header_last; /* To get it checked for Sender: */
2815 }
2816 }
2817
2818 /* There is a non-null envelope sender. Build the header using the original
2819 sender address, before any rewriting that might have been done while
2820 verifying it. */
2821
2822 else
2823 {
2824 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2825 oname,
2826 (oname[0] == 0)? "" : " <",
2827 (sender_address_unrewritten == NULL)?
2828 sender_address : sender_address_unrewritten,
2829 (oname[0] == 0)? "" : ">");
2830
2831 from_header = header_last; /* To get it checked for Sender: */
2832 }
2833 }
2834
2835
2836 /* If the sender is local (without suppress_local_fixups), or if we are in
2837 submission mode and there is an authenticated_id, check that an existing From:
2838 is correct, and if not, generate a Sender: header, unless disabled. Any
2839 previously-existing Sender: header was removed above. Note that sender_local,
2840 as well as being TRUE if the caller of exim is not trusted, is also true if a
2841 trusted caller did not supply a -f argument for non-smtp input. To allow
2842 trusted callers to forge From: without supplying -f, we have to test explicitly
2843 here. If the From: header contains more than one address, then the call to
2844 parse_extract_address fails, and a Sender: header is inserted, as required. */
2845
2846 if (from_header != NULL &&
2847 (active_local_from_check &&
2848 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2849 (submission_mode && authenticated_id != NULL))
2850 ))
2851 {
2852 BOOL make_sender = TRUE;
2853 int start, end, domain;
2854 uschar *errmess;
2855 uschar *from_address =
2856 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2857 &start, &end, &domain, FALSE);
2858 uschar *generated_sender_address;
2859
2860 if (submission_mode)
2861 {
2862 if (submission_domain == NULL)
2863 {
2864 generated_sender_address = string_sprintf("%s@%s",
2865 local_part_quote(authenticated_id), qualify_domain_sender);
2866 }
2867 else if (submission_domain[0] == 0) /* empty => full address */
2868 {
2869 generated_sender_address = string_sprintf("%s",
2870 authenticated_id);
2871 }
2872 else
2873 {
2874 generated_sender_address = string_sprintf("%s@%s",
2875 local_part_quote(authenticated_id), submission_domain);
2876 }
2877 }
2878 else
2879 generated_sender_address = string_sprintf("%s@%s",
2880 local_part_quote(originator_login), qualify_domain_sender);
2881
2882 /* Remove permitted prefixes and suffixes from the local part of the From:
2883 address before doing the comparison with the generated sender. */
2884
2885 if (from_address != NULL)
2886 {
2887 int slen;
2888 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2889
2890 if (at != NULL) *at = 0;
2891 from_address += route_check_prefix(from_address, local_from_prefix);
2892 slen = route_check_suffix(from_address, local_from_suffix);
2893 if (slen > 0)
2894 {
2895 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2896 from_address += slen;
2897 }
2898 if (at != NULL) *at = '@';
2899
2900 if (strcmpic(generated_sender_address, from_address) == 0 ||
2901 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2902 make_sender = FALSE;
2903 }
2904
2905 /* We have to cause the Sender header to be rewritten if there are
2906 appropriate rewriting rules. */
2907
2908 if (make_sender)
2909 {
2910 if (submission_mode && submission_name == NULL)
2911 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2912 generated_sender_address);
2913 else
2914 header_add(htype_sender, "%sSender: %s <%s>\n",
2915 resent_prefix,
2916 submission_mode? submission_name : originator_name,
2917 generated_sender_address);
2918 }
2919
2920 /* Ensure that a non-null envelope sender address corresponds to the
2921 submission mode sender address. */
2922
2923 if (submission_mode && sender_address[0] != 0)
2924 {
2925 if (sender_address_unrewritten == NULL)
2926 sender_address_unrewritten = sender_address;
2927 sender_address = generated_sender_address;
2928 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2929 log_write(L_address_rewrite, LOG_MAIN,
2930 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2931 sender_address_unrewritten, generated_sender_address);
2932 }
2933 }
2934
2935 /* If there are any rewriting rules, apply them to the sender address, unless
2936 it has already been rewritten as part of verification for SMTP input. */
2937
2938 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2939 sender_address[0] != 0)
2940 {
2941 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2942 global_rewrite_rules, rewrite_existflags);
2943 DEBUG(D_receive|D_rewrite)
2944 debug_printf("rewritten sender = %s\n", sender_address);
2945 }
2946
2947
2948 /* The headers must be run through rewrite_header(), because it ensures that
2949 addresses are fully qualified, as well as applying any rewriting rules that may
2950 exist.
2951
2952 Qualification of header addresses in a message from a remote host happens only
2953 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2954 appropriate. For local messages, qualification always happens, unless -bnq is
2955 used to explicitly suppress it. No rewriting is done for an unqualified address
2956 that is left untouched.
2957
2958 We start at the second header, skipping our own Received:. This rewriting is
2959 documented as happening *after* recipient addresses are taken from the headers
2960 by the -t command line option. An added Sender: gets rewritten here. */
2961
2962 for (h = header_list->next; h; h = h->next)
2963 {
2964 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2965 rewrite_existflags, TRUE);
2966 if (newh) h = newh;
2967 }
2968
2969
2970 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2971 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2972 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2973 exists, this applies to the set of resent- headers rather than the normal set.
2974
2975 The requirement for a recipient header has been removed in RFC 2822. At this
2976 point in the code, earlier versions of Exim added a To: header for locally
2977 submitted messages, and an empty Bcc: header for others. In the light of the
2978 changes in RFC 2822, this was dropped in November 2003. */
2979
2980
2981 /* If there is no date header, generate one if the message originates locally
2982 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2983 submission mode flag is set. Messages without Date: are not valid, but it seems
2984 to be more confusing if Exim adds one to all remotely-originated messages.
2985 As per Message-Id, we prepend if resending, else append.
2986 */
2987
2988 if (!date_header_exists &&
2989 ((sender_host_address == NULL && !suppress_local_fixups)
2990 || submission_mode))
2991 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2992 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2993
2994 search_tidyup(); /* Free any cached resources */
2995
2996 /* Show the complete set of headers if debugging. Note that the first one (the
2997 new Received:) has not yet been set. */
2998
2999 DEBUG(D_receive)
3000 {
3001 debug_printf(">>Headers after rewriting and local additions:\n");
3002 for (h = header_list->next; h != NULL; h = h->next)
3003 debug_printf("%c %s", h->type, h->text);
3004 debug_printf("\n");
3005 }
3006
3007 /* The headers are now complete in store. If we are running in filter
3008 testing mode, that is all this function does. Return TRUE if the message
3009 ended with a dot. */
3010
3011 if (filter_test != FTEST_NONE)
3012 {
3013 process_info[process_info_len] = 0;
3014 return message_ended == END_DOT;
3015 }
3016
3017 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3018 think more if it could be handled. Cannot do onward CHUNKING unless
3019 inbound is, but inbound chunking ought to be ok with outbound plain.
3020 Could we do onward CHUNKING given inbound CHUNKING?
3021 */
3022 if (chunking_state > CHUNKING_OFFERED)
3023 cancel_cutthrough_connection(FALSE, US"chunking active");
3024
3025 /* Cutthrough delivery:
3026 We have to create the Received header now rather than at the end of reception,
3027 so the timestamp behaviour is a change to the normal case.
3028 Having created it, send the headers to the destination. */
3029
3030 if (cutthrough.fd >= 0 && cutthrough.delivery)
3031 {
3032 if (received_count > received_headers_max)
3033 {
3034 cancel_cutthrough_connection(TRUE, US"too many headers");
3035 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3036 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3037 "Too many \"Received\" headers",
3038 sender_address,
3039 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3040 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3041 message_id[0] = 0; /* Indicate no message accepted */
3042 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3043 goto TIDYUP; /* Skip to end of function */
3044 }
3045 received_header_gen();
3046 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3047 (void) cutthrough_headers_send();
3048 }
3049
3050
3051 /* Open a new spool file for the data portion of the message. We need
3052 to access it both via a file descriptor and a stream. Try to make the
3053 directory if it isn't there. */
3054
3055 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3056 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3057
3058 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3059 {
3060 if (errno == ENOENT)
3061 {
3062 (void) directory_make(spool_directory,
3063 spool_sname(US"input", message_subdir),
3064 INPUT_DIRECTORY_MODE, TRUE);
3065 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3066 }
3067 if (data_fd < 0)
3068 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3069 spool_name, strerror(errno));
3070 }
3071
3072 /* Make sure the file's group is the Exim gid, and double-check the mode
3073 because the group setting doesn't always get set automatically. */
3074
3075 if (fchown(data_fd, exim_uid, exim_gid))
3076 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3077 "Failed setting ownership on spool file %s: %s",
3078 spool_name, strerror(errno));
3079 (void)fchmod(data_fd, SPOOL_MODE);
3080
3081 /* We now have data file open. Build a stream for it and lock it. We lock only
3082 the first line of the file (containing the message ID) because otherwise there
3083 are problems when Exim is run under Cygwin (I'm told). See comments in
3084 spool_in.c, where the same locking is done. */
3085
3086 data_file = fdopen(data_fd, "w+");
3087 lock_data.l_type = F_WRLCK;
3088 lock_data.l_whence = SEEK_SET;
3089 lock_data.l_start = 0;
3090 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3091
3092 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3093 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3094 errno, strerror(errno));
3095
3096 /* We have an open, locked data file. Write the message id to it to make it
3097 self-identifying. Then read the remainder of the input of this message and
3098 write it to the data file. If the variable next != NULL, it contains the first
3099 data line (which was read as a header but then turned out not to have the right
3100 format); write it (remembering that it might contain binary zeros). The result
3101 of fwrite() isn't inspected; instead we call ferror() below. */
3102
3103 fprintf(data_file, "%s-D\n", message_id);
3104 if (next != NULL)
3105 {
3106 uschar *s = next->text;
3107 int len = next->slen;
3108 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3109 body_linecount++; /* Assumes only 1 line */
3110 }
3111
3112 /* Note that we might already be at end of file, or the logical end of file
3113 (indicated by '.'), or might have encountered an error while writing the
3114 message id or "next" line. */
3115
3116 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3117 {
3118 if (smtp_input)
3119 {
3120 message_ended = chunking_state <= CHUNKING_OFFERED
3121 ? read_message_data_smtp(data_file)
3122 : spool_wireformat
3123 ? read_message_bdat_smtp_wire(data_file)
3124 : read_message_bdat_smtp(data_file);
3125 receive_linecount++; /* The terminating "." line */
3126 }
3127 else message_ended = read_message_data(data_file);
3128
3129 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3130 message_linecount += body_linecount;
3131
3132 switch (message_ended)
3133 {
3134 /* Handle premature termination of SMTP */
3135
3136 case END_EOF:
3137 if (smtp_input)
3138 {
3139 Uunlink(spool_name); /* Lose data file when closed */
3140 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3141 message_id[0] = 0; /* Indicate no message accepted */
3142 smtp_reply = handle_lost_connection(US"");
3143 smtp_yield = FALSE;
3144 goto TIDYUP; /* Skip to end of function */
3145 }
3146 break;
3147
3148 /* Handle message that is too big. Don't use host_or_ident() in the log
3149 message; we want to see the ident value even for non-remote messages. */
3150
3151 case END_SIZE:
3152 Uunlink(spool_name); /* Lose the data file when closed */
3153 cancel_cutthrough_connection(TRUE, US"mail too big");
3154 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3155
3156 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3157 "message too big: read=%d max=%d",
3158 sender_address,
3159 (sender_fullhost == NULL)? "" : " H=",
3160 (sender_fullhost == NULL)? US"" : sender_fullhost,
3161 (sender_ident == NULL)? "" : " U=",
3162 (sender_ident == NULL)? US"" : sender_ident,
3163 message_size,
3164 thismessage_size_limit);
3165
3166 if (smtp_input)
3167 {
3168 smtp_reply = US"552 Message size exceeds maximum permitted";
3169 message_id[0] = 0; /* Indicate no message accepted */
3170 goto TIDYUP; /* Skip to end of function */
3171 }
3172 else
3173 {
3174 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3175 give_local_error(ERRMESS_TOOBIG,
3176 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3177 US"message rejected: ", error_rc, data_file, header_list);
3178 /* Does not return */
3179 }
3180 break;
3181
3182 /* Handle bad BDAT protocol sequence */
3183
3184 case END_PROTOCOL:
3185 Uunlink(spool_name); /* Lose the data file when closed */
3186 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3187 smtp_reply = US""; /* Response already sent */
3188 message_id[0] = 0; /* Indicate no message accepted */
3189 goto TIDYUP; /* Skip to end of function */
3190 }
3191 }
3192
3193 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3194 example, there may be some expansion in an ACL that uses a timer.) */
3195
3196 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3197
3198 /* The message body has now been read into the data file. Call fflush() to
3199 empty the buffers in C, and then call fsync() to get the data written out onto
3200 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3201 having to do this). If there was an I/O error on either input or output,
3202 attempt to send an error message, and unlink the spool file. For non-SMTP input
3203 we can then give up. Note that for SMTP input we must swallow the remainder of
3204 the input in cases of output errors, since the far end doesn't expect to see
3205 anything until the terminating dot line is sent. */
3206
3207 if (fflush(data_file) == EOF || ferror(data_file) ||
3208 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3209 {
3210 uschar *msg_errno = US strerror(errno);
3211 BOOL input_error = (receive_ferror)() != 0;
3212 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3213 input_error? "Input read" : "Spool write",
3214 msg_errno,
3215 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3216
3217 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3218 Uunlink(spool_name); /* Lose the data file */
3219 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3220
3221 if (smtp_input)
3222 {
3223 if (input_error)
3224 smtp_reply = US"451 Error while reading input data";
3225 else
3226 {
3227 smtp_reply = US"451 Error while writing spool file";
3228 receive_swallow_smtp();
3229 }
3230 message_id[0] = 0; /* Indicate no message accepted */
3231 goto TIDYUP; /* Skip to end of function */
3232 }
3233
3234 else
3235 {
3236 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3237 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3238 header_list);
3239 /* Does not return */
3240 }
3241 }
3242
3243
3244 /* No I/O errors were encountered while writing the data file. */
3245
3246 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3247
3248
3249 /* If there were any bad addresses extracted by -t, or there were no recipients
3250 left after -t, send a message to the sender of this message, or write it to
3251 stderr if the error handling option is set that way. Note that there may
3252 legitimately be no recipients for an SMTP message if they have all been removed
3253 by "discard".
3254
3255 We need to rewind the data file in order to read it. In the case of no
3256 recipients or stderr error writing, throw the data file away afterwards, and
3257 exit. (This can't be SMTP, which always ensures there's at least one
3258 syntactically good recipient address.) */
3259
3260 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3261 {
3262 DEBUG(D_receive)
3263 {
3264 if (recipients_count == 0) debug_printf("*** No recipients\n");
3265 if (bad_addresses != NULL)
3266 {
3267 error_block *eblock = bad_addresses;
3268 debug_printf("*** Bad address(es)\n");
3269 while (eblock != NULL)
3270 {
3271 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3272 eblock = eblock->next;
3273 }
3274 }
3275 }
3276
3277 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3278
3279 /* If configured to send errors to the sender, but this fails, force
3280 a failure error code. We use a special one for no recipients so that it
3281 can be detected by the autoreply transport. Otherwise error_rc is set to
3282 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3283 it is EXIT_SUCCESS. */
3284
3285 if (error_handling == ERRORS_SENDER)
3286 {
3287 if (!moan_to_sender(
3288 (bad_addresses == NULL)?
3289 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3290 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3291 bad_addresses, header_list, data_file, FALSE))
3292 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3293 }
3294 else
3295 {
3296 if (bad_addresses == NULL)
3297 {
3298 if (extracted_ignored)
3299 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3300 else
3301 fprintf(stderr, "exim: no recipients in message\n");
3302 }
3303 else
3304 {
3305 fprintf(stderr, "exim: invalid address%s",
3306 (bad_addresses->next == NULL)? ":" : "es:\n");
3307 while (bad_addresses != NULL)
3308 {
3309 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3310 bad_addresses->text2);
3311 bad_addresses = bad_addresses->next;
3312 }
3313 }
3314 }
3315
3316 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3317 {
3318 Uunlink(spool_name);
3319 (void)fclose(data_file);
3320 exim_exit(error_rc, US"receiving");
3321 }
3322 }
3323
3324 /* Data file successfully written. Generate text for the Received: header by
3325 expanding the configured string, and adding a timestamp. By leaving this
3326 operation till now, we ensure that the timestamp is the time that message
3327 reception was completed. However, this is deliberately done before calling the
3328 data ACL and local_scan().
3329
3330 This Received: header may therefore be inspected by the data ACL and by code in
3331 the local_scan() function. When they have run, we update the timestamp to be
3332 the final time of reception.
3333
3334 If there is just one recipient, set up its value in the $received_for variable
3335 for use when we generate the Received: header.
3336
3337 Note: the checking for too many Received: headers is handled by the delivery
3338 code. */
3339 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3340
3341 if (received_header->text == NULL) /* Non-cutthrough case */
3342 {
3343 received_header_gen();
3344
3345 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3346
3347 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3348 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3349
3350 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3351 now, before running the DATA ACL. */
3352
3353 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3354 }
3355 else
3356 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3357 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3358
3359 /* If an ACL is specified for checking things at this stage of reception of a
3360 message, run it, unless all the recipients were removed by "discard" in earlier
3361 ACLs. That is the only case in which recipients_count can be zero at this
3362 stage. Set deliver_datafile to point to the data file so that $message_body and
3363 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3364 */
3365
3366 deliver_datafile = data_fd;
3367 user_msg = NULL;
3368
3369 enable_dollar_recipients = TRUE;
3370
3371 if (recipients_count == 0)
3372 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3373
3374 else
3375 {
3376 /* Handle interactive SMTP messages */
3377
3378 if (smtp_input && !smtp_batched_input)
3379 {
3380
3381 #ifndef DISABLE_DKIM
3382 if (!dkim_disable_verify)
3383 {
3384 /* Finish verification */
3385 dkim_exim_verify_finish();
3386
3387 /* Check if we must run the DKIM ACL */
3388 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3389 {
3390 uschar * dkim_verify_signers_expanded =
3391 expand_string(dkim_verify_signers);
3392 gstring * results = NULL;
3393 int signer_sep = 0;
3394 const uschar * ptr;
3395 uschar * item;
3396 gstring * seen_items = NULL;
3397 int old_pool = store_pool;
3398
3399 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3400
3401 if (!(ptr = dkim_verify_signers_expanded))
3402 log_write(0, LOG_MAIN|LOG_PANIC,
3403 "expansion of dkim_verify_signers option failed: %s",
3404 expand_string_message);
3405
3406 /* Default to OK when no items are present */
3407 rc = OK;
3408 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3409 {
3410 /* Prevent running ACL for an empty item */
3411 if (!item || !*item) continue;
3412
3413 /* Only run ACL once for each domain or identity,
3414 no matter how often it appears in the expanded list. */
3415 if (seen_items)
3416 {
3417 uschar * seen_item;
3418 const uschar * seen_items_list = string_from_gstring(seen_items);
3419 int seen_sep = ':';
3420 BOOL seen_this_item = FALSE;
3421
3422 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3423 NULL, 0)))
3424 if (Ustrcmp(seen_item,item) == 0)
3425 {
3426 seen_this_item = TRUE;
3427 break;
3428 }
3429
3430 if (seen_this_item)
3431 {
3432 DEBUG(D_receive)
3433 debug_printf("acl_smtp_dkim: skipping signer %s, "
3434 "already seen\n", item);
3435 continue;
3436 }
3437
3438 seen_items = string_catn(seen_items, US":", 1);
3439 }
3440 seen_items = string_cat(seen_items, item);
3441
3442 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3443 if (rc != OK)
3444 {
3445 DEBUG(D_receive)
3446 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3447 "skipping remaining items\n", rc, item);
3448 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3449 break;
3450 }
3451 }
3452 dkim_verify_status = string_from_gstring(results);
3453 store_pool = old_pool;
3454 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3455 if (rc == DISCARD)
3456 {
3457 recipients_count = 0;
3458 blackholed_by = US"DKIM ACL";
3459 if (log_msg)
3460 blackhole_log_msg = string_sprintf(": %s", log_msg);
3461 }
3462 else if (rc != OK)
3463 {
3464 Uunlink(spool_name);
3465 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3466 smtp_yield = FALSE; /* No more messages after dropped connection */
3467 smtp_reply = US""; /* Indicate reply already sent */
3468 message_id[0] = 0; /* Indicate no message accepted */
3469 goto TIDYUP; /* Skip to end of function */
3470 }
3471 }
3472 else
3473 dkim_exim_verify_log_all();
3474 }
3475 #endif /* DISABLE_DKIM */
3476
3477 #ifdef WITH_CONTENT_SCAN
3478 if (recipients_count > 0 &&
3479 acl_smtp_mime != NULL &&
3480 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3481 goto TIDYUP;
3482 #endif /* WITH_CONTENT_SCAN */
3483
3484 #ifdef EXPERIMENTAL_DMARC
3485 dmarc_up = dmarc_store_data(from_header);
3486 #endif /* EXPERIMENTAL_DMARC */
3487
3488 #ifndef DISABLE_PRDR
3489 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3490 {
3491 unsigned int c;
3492 int all_pass = OK;
3493 int all_fail = FAIL;
3494
3495 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3496 /* Loop through recipients, responses must be in same order received */
3497 for (c = 0; recipients_count > c; c++)
3498 {
3499 uschar * addr= recipients_list[c].address;
3500 uschar * msg= US"PRDR R=<%s> %s";
3501 uschar * code;
3502 DEBUG(D_receive)
3503 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3504 addr, c+1, recipients_count);
3505 rc = acl_check(ACL_WHERE_PRDR, addr,
3506 acl_smtp_data_prdr, &user_msg, &log_msg);
3507
3508 /* If any recipient rejected content, indicate it in final message */
3509 all_pass |= rc;
3510 /* If all recipients rejected, indicate in final message */
3511 all_fail &= rc;
3512
3513 switch (rc)
3514 {
3515 case OK: case DISCARD: code = US"250"; break;
3516 case DEFER: code = US"450"; break;
3517 default: code = US"550"; break;
3518 }
3519 if (user_msg != NULL)
3520 smtp_user_msg(code, user_msg);
3521 else
3522 {
3523 switch (rc)
3524 {
3525 case OK: case DISCARD:
3526 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3527 case DEFER:
3528 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3529 default:
3530 msg = string_sprintf(CS msg, addr, "refusal"); break;
3531 }
3532 smtp_user_msg(code, msg);
3533 }
3534 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3535 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3536 else log_write(0, LOG_MAIN, "%s", CS msg);
3537
3538 if (rc != OK) { receive_remove_recipient(addr); c--; }
3539 }
3540 /* Set up final message, used if data acl gives OK */
3541 smtp_reply = string_sprintf("%s id=%s message %s",
3542 all_fail == FAIL ? US"550" : US"250",
3543 message_id,
3544 all_fail == FAIL
3545 ? US"rejected for all recipients"
3546 : all_pass == OK
3547 ? US"accepted"
3548 : US"accepted for some recipients");
3549 if (recipients_count == 0)
3550 {
3551 message_id[0] = 0; /* Indicate no message accepted */
3552 goto TIDYUP;
3553 }
3554 }
3555 else
3556 prdr_requested = FALSE;
3557 #endif /* !DISABLE_PRDR */
3558
3559 /* Check the recipients count again, as the MIME ACL might have changed
3560 them. */
3561
3562 if (acl_smtp_data != NULL && recipients_count > 0)
3563 {
3564 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3565 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3566 if (rc == DISCARD)
3567 {
3568 recipients_count = 0;
3569 blackholed_by = US"DATA ACL";
3570 if (log_msg)
3571 blackhole_log_msg = string_sprintf(": %s", log_msg);
3572 cancel_cutthrough_connection(TRUE, US"data acl discard");
3573 }
3574 else if (rc != OK)
3575 {
3576 Uunlink(spool_name);
3577 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3578 #ifdef WITH_CONTENT_SCAN
3579 unspool_mbox();
3580 #endif
3581 #ifdef EXPERIMENTAL_DCC
3582 dcc_ok = 0;
3583 #endif
3584 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3585 smtp_yield = FALSE; /* No more messages after dropped connection */
3586 smtp_reply = US""; /* Indicate reply already sent */
3587 message_id[0] = 0; /* Indicate no message accepted */
3588 goto TIDYUP; /* Skip to end of function */
3589 }
3590 }
3591 }
3592
3593 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3594 we cannot take different actions for permanent and temporary rejections. */
3595
3596 else
3597 {
3598
3599 #ifdef WITH_CONTENT_SCAN
3600 if (acl_not_smtp_mime != NULL &&
3601 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3602 &blackholed_by))
3603 goto TIDYUP;
3604 #endif /* WITH_CONTENT_SCAN */
3605
3606 if (acl_not_smtp != NULL)
3607 {
3608 uschar *user_msg, *log_msg;
3609 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3610 if (rc == DISCARD)
3611 {
3612 recipients_count = 0;
3613 blackholed_by = US"non-SMTP ACL";
3614 if (log_msg != NULL)
3615 blackhole_log_msg = string_sprintf(": %s", log_msg);
3616 }
3617 else if (rc != OK)
3618 {
3619 Uunlink(spool_name);
3620 #ifdef WITH_CONTENT_SCAN
3621 unspool_mbox();
3622 #endif
3623 #ifdef EXPERIMENTAL_DCC
3624 dcc_ok = 0;
3625 #endif
3626 /* The ACL can specify where rejections are to be logged, possibly
3627 nowhere. The default is main and reject logs. */
3628
3629 if (log_reject_target != 0)
3630 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3631 sender_address, log_msg);
3632
3633 if (user_msg == NULL) user_msg = US"local configuration problem";
3634 if (smtp_batched_input)
3635 {
3636 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3637 /* Does not return */
3638 }
3639 else
3640 {
3641 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3642 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3643 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3644 header_list);
3645 /* Does not return */
3646 }
3647 }
3648 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3649 }
3650 }
3651
3652 /* The applicable ACLs have been run */
3653
3654 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3655 if (queue_only_policy) queued_by = US"ACL";
3656 }
3657
3658 #ifdef WITH_CONTENT_SCAN
3659 unspool_mbox();
3660 #endif
3661
3662 #ifdef EXPERIMENTAL_DCC
3663 dcc_ok = 0;
3664 #endif
3665
3666
3667 /* The final check on the message is to run the scan_local() function. The
3668 version supplied with Exim always accepts, but this is a hook for sysadmins to
3669 supply their own checking code. The local_scan() function is run even when all
3670 the recipients have been discarded. */
3671 /*XXS could we avoid this for the standard case, given that few people will use it? */
3672
3673 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3674
3675 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3676 deleted, and the incident gets logged. */
3677
3678 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3679 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3680 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3681 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3682
3683 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3684 local_scan_timeout);
3685 local_scan_data = NULL;
3686
3687 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3688 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3689 rc = local_scan(data_fd, &local_scan_data);
3690 alarm(0);
3691 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3692
3693 enable_dollar_recipients = FALSE;
3694
3695 store_pool = POOL_MAIN; /* In case changed */
3696 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3697 local_scan_data);
3698
3699 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3700 os_non_restarting_signal(SIGFPE, SIG_DFL);
3701 os_non_restarting_signal(SIGILL, SIG_DFL);
3702 os_non_restarting_signal(SIGBUS, SIG_DFL);
3703
3704 /* The length check is paranoia against some runaway code, and also because
3705 (for a success return) lines in the spool file are read into big_buffer. */
3706
3707 if (local_scan_data != NULL)
3708 {
3709 int len = Ustrlen(local_scan_data);
3710 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3711 local_scan_data = string_copyn(local_scan_data, len);
3712 }
3713
3714 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3715 {
3716 if (!deliver_freeze) /* ACL might have already frozen */
3717 {
3718 deliver_freeze = TRUE;
3719 deliver_frozen_at = time(NULL);
3720 frozen_by = US"local_scan()";
3721 }
3722 rc = LOCAL_SCAN_ACCEPT;
3723 }
3724 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3725 {
3726 if (!queue_only_policy) /* ACL might have already queued */
3727 {
3728 queue_only_policy = TRUE;
3729 queued_by = US"local_scan()";
3730 }
3731 rc = LOCAL_SCAN_ACCEPT;
3732 }
3733
3734 /* Message accepted: remove newlines in local_scan_data because otherwise
3735 the spool file gets corrupted. Ensure that all recipients are qualified. */
3736
3737 if (rc == LOCAL_SCAN_ACCEPT)
3738 {
3739 if (local_scan_data != NULL)
3740 {
3741 uschar *s;
3742 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3743 }
3744 for (i = 0; i < recipients_count; i++)
3745 {
3746 recipient_item *r = recipients_list + i;
3747 r->address = rewrite_address_qualify(r->address, TRUE);
3748 if (r->errors_to != NULL)
3749 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3750 }
3751 if (recipients_count == 0 && blackholed_by == NULL)
3752 blackholed_by = US"local_scan";
3753 }
3754
3755 /* Message rejected: newlines permitted in local_scan_data to generate
3756 multiline SMTP responses. */
3757
3758 else
3759 {
3760 uschar *istemp = US"";
3761 uschar *smtp_code;
3762 gstring * g;
3763
3764 errmsg = local_scan_data;
3765
3766 Uunlink(spool_name); /* Cancel this message */
3767 switch(rc)
3768 {
3769 default:
3770 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3771 "rejection given", rc);
3772 goto TEMPREJECT;
3773
3774 case LOCAL_SCAN_REJECT_NOLOGHDR:
3775 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3776 /* Fall through */
3777
3778 case LOCAL_SCAN_REJECT:
3779 smtp_code = US"550";
3780 if (!errmsg) errmsg = US"Administrative prohibition";
3781 break;
3782
3783 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3784 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3785 /* Fall through */
3786
3787 case LOCAL_SCAN_TEMPREJECT:
3788 TEMPREJECT:
3789 smtp_code = US"451";
3790 if (!errmsg) errmsg = US"Temporary local problem";
3791 istemp = US"temporarily ";
3792 break;
3793 }
3794
3795 g = string_append(NULL, 2, US"F=",
3796 sender_address[0] == 0 ? US"<>" : sender_address);
3797 g = add_host_info_for_log(g);
3798
3799 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3800 string_from_gstring(g), istemp, string_printing(errmsg));
3801
3802 if (smtp_input)
3803 {
3804 if (!smtp_batched_input)
3805 {
3806 smtp_respond(smtp_code, 3, TRUE, errmsg);
3807 message_id[0] = 0; /* Indicate no message accepted */
3808 smtp_reply = US""; /* Indicate reply already sent */
3809 goto TIDYUP; /* Skip to end of function */
3810 }
3811 else
3812 {
3813 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3814 /* Does not return */
3815 }
3816 }
3817 else
3818 {
3819 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3820 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3821 US"message rejected by local scan code: ", error_rc, data_file,
3822 header_list);
3823 /* Does not return */
3824 }
3825 }
3826
3827 /* Reset signal handlers to ignore signals that previously would have caused
3828 the message to be abandoned. */
3829
3830 signal(SIGTERM, SIG_IGN);
3831 signal(SIGINT, SIG_IGN);
3832
3833
3834 /* Ensure the first time flag is set in the newly-received message. */
3835
3836 deliver_firsttime = TRUE;
3837
3838 #ifdef EXPERIMENTAL_BRIGHTMAIL
3839 if (bmi_run == 1)
3840 { /* rewind data file */
3841 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3842 bmi_verdicts = bmi_process_message(header_list, data_fd);
3843 }
3844 #endif
3845
3846 /* Update the timestamp in our Received: header to account for any time taken by
3847 an ACL or by local_scan(). The new time is the time that all reception
3848 processing is complete. */
3849
3850 timestamp = expand_string(US"${tod_full}");
3851 tslen = Ustrlen(timestamp);
3852
3853 memcpy(received_header->text + received_header->slen - tslen - 1,
3854 timestamp, tslen);
3855
3856 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3857
3858 if (mua_wrapper)
3859 {
3860 deliver_freeze = FALSE;
3861 queue_only_policy = FALSE;
3862 }
3863
3864 /* Keep the data file open until we have written the header file, in order to
3865 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3866 don't write the header file, and we unlink the data file. If writing the header
3867 file fails, we have failed to accept this message. */
3868
3869 if (host_checking || blackholed_by != NULL)
3870 {
3871 header_line *h;
3872 Uunlink(spool_name);
3873 msg_size = 0; /* Compute size for log line */
3874 for (h = header_list; h != NULL; h = h->next)
3875 if (h->type != '*') msg_size += h->slen;
3876 }
3877
3878 /* Write the -H file */
3879
3880 else
3881 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3882 {
3883 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3884 Uunlink(spool_name); /* Lose the data file */
3885
3886 if (smtp_input)
3887 {
3888 smtp_reply = US"451 Error in writing spool file";
3889 message_id[0] = 0; /* Indicate no message accepted */
3890 goto TIDYUP;
3891 }
3892 else
3893 {
3894 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3895 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3896 header_list);
3897 /* Does not return */
3898 }
3899 }
3900
3901
3902 /* The message has now been successfully received. */
3903
3904 receive_messagecount++;
3905
3906 /* In SMTP sessions we may receive several in one connection. After each one,
3907 we wait for the clock to tick at the level of message-id granularity. This is
3908 so that the combination of time+pid is unique, even on systems where the pid
3909 can be re-used within our time interval. We can't shorten the interval without
3910 re-designing the message-id. See comments above where the message id is
3911 created. This is Something For The Future. */
3912
3913 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3914 exim_wait_tick(&message_id_tv, id_resolution);
3915
3916 /* Add data size to written header size. We do not count the initial file name
3917 that is in the file, but we do add one extra for the notional blank line that
3918 precedes the data. This total differs from message_size in that it include the
3919 added Received: header and any other headers that got created locally. */
3920
3921 fflush(data_file);
3922 fstat(data_fd, &statbuf);
3923
3924 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3925
3926 /* Generate a "message received" log entry. We do this by building up a dynamic
3927 string as required. Since we commonly want to add two items at a time, use a
3928 macro to simplify the coding. We log the arrival of a new message while the
3929 file is still locked, just in case the machine is *really* fast, and delivers
3930 it first! Include any message id that is in the message - since the syntax of a
3931 message id is actually an addr-spec, we can use the parse routine to canonicalize
3932 it. */
3933
3934 g = string_get(256);
3935
3936 g = string_append(g, 2,
3937 fake_response == FAIL ? US"(= " : US"<= ",
3938 sender_address[0] == 0 ? US"<>" : sender_address);
3939 if (message_reference)
3940 g = string_append(g, 2, US" R=", message_reference);
3941
3942 g = add_host_info_for_log(g);
3943
3944 #ifdef SUPPORT_TLS
3945 if (LOGGING(tls_cipher) && tls_in.cipher)
3946 g = string_append(g, 2, US" X=", tls_in.cipher);
3947 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3948 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3949 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3950 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3951 if (LOGGING(tls_sni) && tls_in.sni)
3952 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3953 #endif
3954
3955 if (sender_host_authenticated)
3956 {
3957 g = string_append(g, 2, US" A=", sender_host_authenticated);
3958 if (authenticated_id)
3959 {
3960 g = string_append(g, 2, US":", authenticated_id);
3961 if (LOGGING(smtp_mailauth) && authenticated_sender)
3962 g = string_append(g, 2, US":", authenticated_sender);
3963 }
3964 }
3965
3966 #ifndef DISABLE_PRDR
3967 if (prdr_requested)
3968 g = string_catn(g, US" PRDR", 5);
3969 #endif
3970
3971 #ifdef SUPPORT_PROXY
3972 if (proxy_session && LOGGING(proxy))
3973 g = string_append(g, 2, US" PRX=", proxy_local_address);
3974 #endif
3975
3976 if (chunking_state > CHUNKING_OFFERED)
3977 g = string_catn(g, US" K", 2);
3978
3979 sprintf(CS big_buffer, "%d", msg_size);
3980 g = string_append(g, 2, US" S=", big_buffer);
3981
3982 /* log 8BITMIME mode announced in MAIL_FROM
3983 0 ... no BODY= used
3984 7 ... 7BIT
3985 8 ... 8BITMIME */
3986 if (LOGGING(8bitmime))
3987 {
3988 sprintf(CS big_buffer, "%d", body_8bitmime);
3989 g = string_append(g, 2, US" M8S=", big_buffer);
3990 }
3991
3992 if (*queue_name)
3993 g = string_append(g, 2, US" Q=", queue_name);
3994
3995 /* If an addr-spec in a message-id contains a quoted string, it can contain
3996 any characters except " \ and CR and so in particular it can contain NL!
3997 Therefore, make sure we use a printing-characters only version for the log.
3998 Also, allow for domain literals in the message id. */
3999
4000 if (msgid_header)
4001 {
4002 uschar *old_id;
4003 BOOL save_allow_domain_literals = allow_domain_literals;
4004 allow_domain_literals = TRUE;
4005 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4006 &errmsg, &start, &end, &domain, FALSE);
4007 allow_domain_literals = save_allow_domain_literals;
4008 if (old_id != NULL)
4009 g = string_append(g, 2, US" id=", string_printing(old_id));
4010 }
4011
4012 /* If subject logging is turned on, create suitable printing-character
4013 text. By expanding $h_subject: we make use of the MIME decoding. */
4014
4015 if (LOGGING(subject) && subject_header != NULL)
4016 {
4017 int i;
4018 uschar *p = big_buffer;
4019 uschar *ss = expand_string(US"$h_subject:");
4020
4021 /* Backslash-quote any double quotes or backslashes so as to make a
4022 a C-like string, and turn any non-printers into escape sequences. */
4023
4024 *p++ = '\"';
4025 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4026 {
4027 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4028 *p++ = ss[i];
4029 }
4030 *p++ = '\"';
4031 *p = 0;
4032 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4033 }
4034
4035 /* Terminate the string: string_cat() and string_append() leave room, but do
4036 not put the zero in. */
4037
4038 (void) string_from_gstring(g);
4039
4040 /* Create a message log file if message logs are being used and this message is
4041 not blackholed. Write the reception stuff to it. We used to leave message log
4042 creation until the first delivery, but this has proved confusing for some
4043 people. */
4044
4045 if (message_logs && !blackholed_by)
4046 {
4047 int fd;
4048
4049 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4050
4051 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4052 && errno == ENOENT
4053 )
4054 {
4055 (void)directory_make(spool_directory,
4056 spool_sname(US"msglog", message_subdir),
4057 MSGLOG_DIRECTORY_MODE, TRUE);
4058 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4059 }
4060
4061 if (fd < 0)
4062 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4063 spool_name, strerror(errno));
4064 else
4065 {
4066 FILE *message_log = fdopen(fd, "a");
4067 if (message_log == NULL)
4068 {
4069 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4070 spool_name, strerror(errno));
4071 (void)close(fd);
4072 }
4073 else
4074 {
4075 uschar *now = tod_stamp(<