93c091c808189b098dcc330100ddb234d7960031
[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: writing spoolfile in wire format\n");
1027 spool_file_wireformat = TRUE;
1028
1029 for (;;)
1030 {
1031 if (chunking_data_left > 0)
1032 {
1033 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1034 uschar * buf = bdat_getbuf(&len);
1035
1036 message_size += len;
1037 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1038 }
1039 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1040 {
1041 case EOF: return END_EOF;
1042 case EOD: return END_DOT;
1043 case ERR: return END_PROTOCOL;
1044
1045 default:
1046 message_size++;
1047 /*XXX not done:
1048 linelength
1049 max_received_linelength
1050 body_linecount
1051 body_zerocount
1052 */
1053 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1054 break;
1055 }
1056 if (message_size > thismessage_size_limit) return END_SIZE;
1057 }
1058 /*NOTREACHED*/
1059 }
1060
1061
1062
1063
1064 /*************************************************
1065 * Swallow SMTP message *
1066 *************************************************/
1067
1068 /* This function is called when there has been some kind of error while reading
1069 an SMTP message, and the remaining data may need to be swallowed. It is global
1070 because it is called from smtp_closedown() to shut down an incoming call
1071 tidily.
1072
1073 Argument: a FILE from which to read the message
1074 Returns: nothing
1075 */
1076
1077 void
1078 receive_swallow_smtp(void)
1079 {
1080 /*XXX CHUNKING: not enough. read chunks until RSET? */
1081 if (message_ended >= END_NOTENDED)
1082 message_ended = read_message_data_smtp(NULL);
1083 }
1084
1085
1086
1087 /*************************************************
1088 * Handle lost SMTP connection *
1089 *************************************************/
1090
1091 /* This function logs connection loss incidents and generates an appropriate
1092 SMTP response.
1093
1094 Argument: additional data for the message
1095 Returns: the SMTP response
1096 */
1097
1098 static uschar *
1099 handle_lost_connection(uschar *s)
1100 {
1101 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1102 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1103 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1104 return US"421 Lost incoming connection";
1105 }
1106
1107
1108
1109
1110 /*************************************************
1111 * Handle a non-smtp reception error *
1112 *************************************************/
1113
1114 /* This function is called for various errors during the reception of non-SMTP
1115 messages. It either sends a message to the sender of the problem message, or it
1116 writes to the standard error stream.
1117
1118 Arguments:
1119 errcode code for moan_to_sender(), identifying the error
1120 text1 first message text, passed to moan_to_sender()
1121 text2 second message text, used only for stderrr
1122 error_rc code to pass to exim_exit if no problem
1123 f FILE containing body of message (may be stdin)
1124 hptr pointer to instore headers or NULL
1125
1126 Returns: calls exim_exit(), which does not return
1127 */
1128
1129 static void
1130 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1131 FILE *f, header_line *hptr)
1132 {
1133 if (error_handling == ERRORS_SENDER)
1134 {
1135 error_block eblock;
1136 eblock.next = NULL;
1137 eblock.text1 = text1;
1138 eblock.text2 = US"";
1139 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1140 error_rc = EXIT_FAILURE;
1141 }
1142 else
1143 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1144 (void)fclose(f);
1145 exim_exit(error_rc, US"");
1146 }
1147
1148
1149
1150 /*************************************************
1151 * Add header lines set up by ACL *
1152 *************************************************/
1153
1154 /* This function is called to add the header lines that were set up by
1155 statements in an ACL to the list of headers in memory. It is done in two stages
1156 like this, because when the ACL for RCPT is running, the other headers have not
1157 yet been received. This function is called twice; once just before running the
1158 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1159 are visible to the DATA ACL.
1160
1161 Originally these header lines were added at the end. Now there is support for
1162 three different places: top, bottom, and after the Received: header(s). There
1163 will always be at least one Received: header, even if it is marked deleted, and
1164 even if something else has been put in front of it.
1165
1166 Arguments:
1167 acl_name text to identify which ACL
1168
1169 Returns: nothing
1170 */
1171
1172 static void
1173 add_acl_headers(int where, uschar *acl_name)
1174 {
1175 header_line *h, *next;
1176 header_line *last_received = NULL;
1177
1178 switch(where)
1179 {
1180 case ACL_WHERE_DKIM:
1181 case ACL_WHERE_MIME:
1182 case ACL_WHERE_DATA:
1183 if ( cutthrough.fd >= 0 && cutthrough.delivery
1184 && (acl_removed_headers || acl_added_headers))
1185 {
1186 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1187 " will not take effect on cutthrough deliveries");
1188 return;
1189 }
1190 }
1191
1192 if (acl_removed_headers)
1193 {
1194 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1195
1196 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1197 {
1198 const uschar * list = acl_removed_headers;
1199 int sep = ':'; /* This is specified as a colon-separated list */
1200 uschar *s;
1201 uschar buffer[128];
1202
1203 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1204 if (header_testname(h, s, Ustrlen(s), FALSE))
1205 {
1206 h->type = htype_old;
1207 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1208 }
1209 }
1210 acl_removed_headers = NULL;
1211 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1212 }
1213
1214 if (!acl_added_headers) return;
1215 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1216
1217 for (h = acl_added_headers; h; h = next)
1218 {
1219 next = h->next;
1220
1221 switch(h->type)
1222 {
1223 case htype_add_top:
1224 h->next = header_list;
1225 header_list = h;
1226 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1227 break;
1228
1229 case htype_add_rec:
1230 if (last_received == NULL)
1231 {
1232 last_received = header_list;
1233 while (!header_testname(last_received, US"Received", 8, FALSE))
1234 last_received = last_received->next;
1235 while (last_received->next != NULL &&
1236 header_testname(last_received->next, US"Received", 8, FALSE))
1237 last_received = last_received->next;
1238 }
1239 h->next = last_received->next;
1240 last_received->next = h;
1241 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1242 break;
1243
1244 case htype_add_rfc:
1245 /* add header before any header which is NOT Received: or Resent- */
1246 last_received = header_list;
1247 while ( (last_received->next != NULL) &&
1248 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1249 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1250 last_received = last_received->next;
1251 /* last_received now points to the last Received: or Resent-* header
1252 in an uninterrupted chain of those header types (seen from the beginning
1253 of all headers. Our current header must follow it. */
1254 h->next = last_received->next;
1255 last_received->next = h;
1256 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1257 break;
1258
1259 default:
1260 h->next = NULL;
1261 header_last->next = h;
1262 break;
1263 }
1264
1265 if (h->next == NULL) header_last = h;
1266
1267 /* Check for one of the known header types (From:, To:, etc.) though in
1268 practice most added headers are going to be "other". Lower case
1269 identification letters are never stored with the header; they are used
1270 for existence tests when messages are received. So discard any lower case
1271 flag values. */
1272
1273 h->type = header_checkname(h, FALSE);
1274 if (h->type >= 'a') h->type = htype_other;
1275
1276 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", header_last->text);
1277 }
1278
1279 acl_added_headers = NULL;
1280 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1281 }
1282
1283
1284
1285 /*************************************************
1286 * Add host information for log line *
1287 *************************************************/
1288
1289 /* Called for acceptance and rejecting log lines. This adds information about
1290 the calling host to a string that is being built dynamically.
1291
1292 Arguments:
1293 s the dynamic string
1294
1295 Returns: the extended string
1296 */
1297
1298 static gstring *
1299 add_host_info_for_log(gstring * g)
1300 {
1301 if (sender_fullhost)
1302 {
1303 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1304 g = string_catn(g, US" DS", 3);
1305 g = string_append(g, 2, US" H=", sender_fullhost);
1306 if (LOGGING(incoming_interface) && interface_address != NULL)
1307 {
1308 g = string_cat(g,
1309 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1310 }
1311 }
1312 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1313 {
1314 g = string_catn(g, US" TFO", 4);
1315 tcp_in_fastopen_logged = TRUE;
1316 }
1317 if (sender_ident)
1318 g = string_append(g, 2, US" U=", sender_ident);
1319 if (received_protocol)
1320 g = string_append(g, 2, US" P=", received_protocol);
1321 return g;
1322 }
1323
1324
1325
1326 #ifdef WITH_CONTENT_SCAN
1327
1328 /*************************************************
1329 * Run the MIME ACL on a message *
1330 *************************************************/
1331
1332 /* This code is in a subroutine so that it can be used for both SMTP
1333 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1334
1335 Arguments:
1336 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1337 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1338 smtp_reply_ptr Where SMTP reply is being built
1339 blackholed_by_ptr Where "blackholed by" message is being built
1340
1341 Returns: TRUE to carry on; FALSE to abandon the message
1342 */
1343
1344 static BOOL
1345 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1346 uschar **blackholed_by_ptr)
1347 {
1348 FILE *mbox_file;
1349 uschar rfc822_file_path[2048];
1350 unsigned long mbox_size;
1351 header_line *my_headerlist;
1352 uschar *user_msg, *log_msg;
1353 int mime_part_count_buffer = -1;
1354 uschar * mbox_filename;
1355 int rc = OK;
1356
1357 memset(CS rfc822_file_path,0,2048);
1358
1359 /* check if it is a MIME message */
1360
1361 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1362 if ( my_headerlist->type != '*' /* skip deleted headers */
1363 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1364 )
1365 {
1366 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1367 goto DO_MIME_ACL;
1368 }
1369
1370 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1371 return TRUE;
1372
1373 DO_MIME_ACL:
1374
1375 /* make sure the eml mbox file is spooled up */
1376 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1377 { /* error while spooling */
1378 log_write(0, LOG_MAIN|LOG_PANIC,
1379 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1380 Uunlink(spool_name);
1381 unspool_mbox();
1382 #ifdef EXPERIMENTAL_DCC
1383 dcc_ok = 0;
1384 #endif
1385 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1386 message_id[0] = 0; /* Indicate no message accepted */
1387 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1388 return FALSE; /* Indicate skip to end of receive function */
1389 }
1390
1391 mime_is_rfc822 = 0;
1392
1393 MIME_ACL_CHECK:
1394 mime_part_count = -1;
1395 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1396 (void)fclose(mbox_file);
1397
1398 if (Ustrlen(rfc822_file_path) > 0)
1399 {
1400 mime_part_count = mime_part_count_buffer;
1401
1402 if (unlink(CS rfc822_file_path) == -1)
1403 {
1404 log_write(0, LOG_PANIC,
1405 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1406 goto END_MIME_ACL;
1407 }
1408 }
1409
1410 /* check if we must check any message/rfc822 attachments */
1411 if (rc == OK)
1412 {
1413 uschar * scandir;
1414 struct dirent * entry;
1415 DIR * tempdir;
1416
1417 scandir = string_copyn(mbox_filename, Ustrrchr(mbox_filename, '/') - mbox_filename);
1418
1419 tempdir = opendir(CS scandir);
1420 for (;;)
1421 {
1422 if (!(entry = readdir(tempdir)))
1423 break;
1424 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1425 {
1426 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1427 "%s/%s", scandir, entry->d_name);
1428 DEBUG(D_receive) debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1429 rfc822_file_path);
1430 break;
1431 }
1432 }
1433 closedir(tempdir);
1434
1435 if (entry)
1436 {
1437 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1438 {
1439 /* set RFC822 expansion variable */
1440 mime_is_rfc822 = 1;
1441 mime_part_count_buffer = mime_part_count;
1442 goto MIME_ACL_CHECK;
1443 }
1444 log_write(0, LOG_PANIC,
1445 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1446 unlink(CS rfc822_file_path);
1447 }
1448 }
1449
1450 END_MIME_ACL:
1451 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1452 if (rc == DISCARD)
1453 {
1454 recipients_count = 0;
1455 *blackholed_by_ptr = US"MIME ACL";
1456 }
1457 else if (rc != OK)
1458 {
1459 Uunlink(spool_name);
1460 unspool_mbox();
1461 #ifdef EXPERIMENTAL_DCC
1462 dcc_ok = 0;
1463 #endif
1464 if ( smtp_input
1465 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1466 {
1467 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1468 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1469 }
1470 message_id[0] = 0; /* Indicate no message accepted */
1471 return FALSE; /* Cause skip to end of receive function */
1472 }
1473
1474 return TRUE;
1475 }
1476
1477 #endif /* WITH_CONTENT_SCAN */
1478
1479
1480
1481 void
1482 received_header_gen(void)
1483 {
1484 uschar *received;
1485 uschar *timestamp;
1486 header_line *received_header= header_list;
1487
1488 timestamp = expand_string(US"${tod_full}");
1489 if (recipients_count == 1) received_for = recipients_list[0].address;
1490 received = expand_string(received_header_text);
1491 received_for = NULL;
1492
1493 if (!received)
1494 {
1495 if(spool_name[0] != 0)
1496 Uunlink(spool_name); /* Lose the data file */
1497 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1498 "(received_header_text) failed: %s", string_printing(received_header_text),
1499 expand_string_message);
1500 }
1501
1502 /* The first element on the header chain is reserved for the Received header,
1503 so all we have to do is fill in the text pointer, and set the type. However, if
1504 the result of the expansion is an empty string, we leave the header marked as
1505 "old" so as to refrain from adding a Received header. */
1506
1507 if (received[0] == 0)
1508 {
1509 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1510 received_header->type = htype_old;
1511 }
1512 else
1513 {
1514 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1515 received_header->type = htype_received;
1516 }
1517
1518 received_header->slen = Ustrlen(received_header->text);
1519
1520 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1521 received_header->type, received_header->text);
1522 }
1523
1524
1525
1526 /*************************************************
1527 * Receive message *
1528 *************************************************/
1529
1530 /* Receive a message on the given input, and put it into a pair of spool files.
1531 Either a non-null list of recipients, or the extract flag will be true, or
1532 both. The flag sender_local is true for locally generated messages. The flag
1533 submission_mode is true if an ACL has obeyed "control = submission". The flag
1534 suppress_local_fixups is true if an ACL has obeyed "control =
1535 suppress_local_fixups" or -G was passed on the command-line.
1536 The flag smtp_input is true if the message is to be
1537 handled using SMTP conventions about termination and lines starting with dots.
1538 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1539
1540 If a message was successfully read, message_id[0] will be non-zero.
1541
1542 The general actions of this function are:
1543
1544 . Read the headers of the message (if any) into a chain of store
1545 blocks.
1546
1547 . If there is a "sender:" header and the message is locally originated,
1548 throw it away, unless the caller is trusted, or unless
1549 active_local_sender_retain is set - which can only happen if
1550 active_local_from_check is false.
1551
1552 . If recipients are to be extracted from the message, build the
1553 recipients list from the headers, removing any that were on the
1554 original recipients list (unless extract_addresses_remove_arguments is
1555 false), and at the same time, remove any bcc header that may be present.
1556
1557 . Get the spool file for the data, sort out its unique name, open
1558 and lock it (but don't give it the name yet).
1559
1560 . Generate a "Message-Id" header if the message doesn't have one, for
1561 locally-originated messages.
1562
1563 . Generate a "Received" header.
1564
1565 . Ensure the recipients list is fully qualified and rewritten if necessary.
1566
1567 . If there are any rewriting rules, apply them to the sender address
1568 and also to the headers.
1569
1570 . If there is no from: header, generate one, for locally-generated messages
1571 and messages in "submission mode" only.
1572
1573 . If the sender is local, check that from: is correct, and if not, generate
1574 a Sender: header, unless message comes from a trusted caller, or this
1575 feature is disabled by active_local_from_check being false.
1576
1577 . If there is no "date" header, generate one, for locally-originated
1578 or submission mode messages only.
1579
1580 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1581 dot_ends mode, to the data file. Leave it open, to hold the lock.
1582
1583 . Write the envelope and the headers to a new file.
1584
1585 . Set the name for the header file; close it.
1586
1587 . Set the name for the data file; close it.
1588
1589 Because this function can potentially be called many times in a single
1590 SMTP connection, all store should be got by store_get(), so that it will be
1591 automatically retrieved after the message is accepted.
1592
1593 FUDGE: It seems that sites on the net send out messages with just LF
1594 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1595 we make the CRs optional in all cases.
1596
1597 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1598 new regime is now in place in which bare CRs in header lines are turned into LF
1599 followed by a space, so as not to terminate the header line.
1600
1601 February 2004: A bare LF in a header line in a message whose first line was
1602 terminated by CRLF is treated in the same way as a bare CR.
1603
1604 Arguments:
1605 extract_recip TRUE if recipients are to be extracted from the message's
1606 headers
1607
1608 Returns: TRUE there are more messages to be read (SMTP input)
1609 FALSE there are no more messages to be read (non-SMTP input
1610 or SMTP connection collapsed, or other failure)
1611
1612 When reading a message for filter testing, the returned value indicates
1613 whether the headers (which is all that is read) were terminated by '.' or
1614 not. */
1615
1616 BOOL
1617 receive_msg(BOOL extract_recip)
1618 {
1619 int i;
1620 int rc = FAIL;
1621 int msg_size = 0;
1622 int process_info_len = Ustrlen(process_info);
1623 int error_rc = (error_handling == ERRORS_SENDER)?
1624 errors_sender_rc : EXIT_FAILURE;
1625 int header_size = 256;
1626 int start, end, domain;
1627 int id_resolution;
1628 int had_zero = 0;
1629 int prevlines_length = 0;
1630
1631 register int ptr = 0;
1632
1633 BOOL contains_resent_headers = FALSE;
1634 BOOL extracted_ignored = FALSE;
1635 BOOL first_line_ended_crlf = TRUE_UNSET;
1636 BOOL smtp_yield = TRUE;
1637 BOOL yield = FALSE;
1638
1639 BOOL resents_exist = FALSE;
1640 uschar *resent_prefix = US"";
1641 uschar *blackholed_by = NULL;
1642 uschar *blackhole_log_msg = US"";
1643 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1644
1645 flock_t lock_data;
1646 error_block *bad_addresses = NULL;
1647
1648 uschar *frozen_by = NULL;
1649 uschar *queued_by = NULL;
1650
1651 uschar *errmsg;
1652 gstring * g;
1653 struct stat statbuf;
1654
1655 /* Final message to give to SMTP caller, and messages from ACLs */
1656
1657 uschar *smtp_reply = NULL;
1658 uschar *user_msg, *log_msg;
1659
1660 /* Working header pointers */
1661
1662 header_line *h, *next;
1663
1664 /* Flags for noting the existence of certain headers (only one left) */
1665
1666 BOOL date_header_exists = FALSE;
1667
1668 /* Pointers to receive the addresses of headers whose contents we need. */
1669
1670 header_line *from_header = NULL;
1671 header_line *subject_header = NULL;
1672 header_line *msgid_header = NULL;
1673 header_line *received_header;
1674
1675 #ifdef EXPERIMENTAL_DMARC
1676 int dmarc_up = 0;
1677 #endif /* EXPERIMENTAL_DMARC */
1678
1679 /* Variables for use when building the Received: header. */
1680
1681 uschar *timestamp;
1682 int tslen;
1683
1684 /* Release any open files that might have been cached while preparing to
1685 accept the message - e.g. by verifying addresses - because reading a message
1686 might take a fair bit of real time. */
1687
1688 search_tidyup();
1689
1690 /* Extracting the recipient list from an input file is incompatible with
1691 cutthrough delivery with the no-spool option. It shouldn't be possible
1692 to set up the combination, but just in case kill any ongoing connection. */
1693 if (extract_recip || !smtp_input)
1694 cancel_cutthrough_connection(TRUE, US"not smtp input");
1695
1696 /* Initialize the chain of headers by setting up a place-holder for Received:
1697 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1698 pointing to the end of the chain to make adding headers simple. */
1699
1700 received_header = header_list = header_last = store_get(sizeof(header_line));
1701 header_list->next = NULL;
1702 header_list->type = htype_old;
1703 header_list->text = NULL;
1704 header_list->slen = 0;
1705
1706 /* Control block for the next header to be read. */
1707
1708 next = store_get(sizeof(header_line));
1709 next->text = store_get(header_size);
1710
1711 /* Initialize message id to be null (indicating no message read), and the
1712 header names list to be the normal list. Indicate there is no data file open
1713 yet, initialize the size and warning count, and deal with no size limit. */
1714
1715 message_id[0] = 0;
1716 data_file = NULL;
1717 data_fd = -1;
1718 spool_name = US"";
1719 message_size = 0;
1720 warning_count = 0;
1721 received_count = 1; /* For the one we will add */
1722
1723 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1724
1725 /* While reading the message, the following counts are computed. */
1726
1727 message_linecount = body_linecount = body_zerocount =
1728 max_received_linelength = 0;
1729
1730 #ifndef DISABLE_DKIM
1731 /* Call into DKIM to set up the context. In CHUNKING mode
1732 we clear the dot-stuffing flag */
1733 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1734 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1735 #endif
1736
1737 #ifdef EXPERIMENTAL_DMARC
1738 /* initialize libopendmarc */
1739 dmarc_up = dmarc_init();
1740 #endif
1741
1742 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1743 ids, and fractions of a second are required. See the comments that precede the
1744 message id creation below. */
1745
1746 (void)gettimeofday(&message_id_tv, NULL);
1747
1748 /* For other uses of the received time we can operate with granularity of one
1749 second, and for that we use the global variable received_time. This is for
1750 things like ultimate message timeouts.XXX */
1751
1752 received_time = message_id_tv;
1753
1754 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1755 happen in the smtp_getc() function when it refills its buffer. */
1756
1757 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1758
1759 /* If not SMTP input, timeout happens only if configured, and we just set a
1760 single timeout for the whole message. */
1761
1762 else if (receive_timeout > 0)
1763 {
1764 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1765 alarm(receive_timeout);
1766 }
1767
1768 /* SIGTERM and SIGINT are caught always. */
1769
1770 signal(SIGTERM, data_sigterm_sigint_handler);
1771 signal(SIGINT, data_sigterm_sigint_handler);
1772
1773 /* Header lines in messages are not supposed to be very long, though when
1774 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1775 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1776 storing the header, and extend this as necessary using string_cat().
1777
1778 To cope with total lunacies, impose an upper limit on the length of the header
1779 section of the message, as otherwise the store will fill up. We must also cope
1780 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1781 Folded header lines are joined into one string, leaving the '\n' characters
1782 inside them, so that writing them out reproduces the input.
1783
1784 Loop for each character of each header; the next structure for chaining the
1785 header is set up already, with ptr the offset of the next character in
1786 next->text. */
1787
1788 for (;;)
1789 {
1790 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1791
1792 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1793 SMTP must have a correct "." terminator. */
1794
1795 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1796 {
1797 smtp_reply = handle_lost_connection(US" (header)");
1798 smtp_yield = FALSE;
1799 goto TIDYUP; /* Skip to end of function */
1800 }
1801
1802 /* See if we are at the current header's size limit - there must be at least
1803 four bytes left. This allows for the new character plus a zero, plus two for
1804 extra insertions when we are playing games with dots and carriage returns. If
1805 we are at the limit, extend the text buffer. This could have been done
1806 automatically using string_cat() but because this is a tightish loop storing
1807 only one character at a time, we choose to do it inline. Normally
1808 store_extend() will be able to extend the block; only at the end of a big
1809 store block will a copy be needed. To handle the case of very long headers
1810 (and sometimes lunatic messages can have ones that are 100s of K long) we
1811 call store_release() for strings that have been copied - if the string is at
1812 the start of a block (and therefore the only thing in it, because we aren't
1813 doing any other gets), the block gets freed. We can only do this release if
1814 there were no allocations since the once that we want to free. */
1815
1816 if (ptr >= header_size - 4)
1817 {
1818 int oldsize = header_size;
1819 /* header_size += 256; */
1820 header_size *= 2;
1821 if (!store_extend(next->text, oldsize, header_size))
1822 next->text = store_newblock(next->text, header_size, ptr);
1823 }
1824
1825 /* Cope with receiving a binary zero. There is dispute about whether
1826 these should be allowed in RFC 822 messages. The middle view is that they
1827 should not be allowed in headers, at least. Exim takes this attitude at
1828 the moment. We can't just stomp on them here, because we don't know that
1829 this line is a header yet. Set a flag to cause scanning later. */
1830
1831 if (ch == 0) had_zero++;
1832
1833 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1834 those from data files use just LF. Treat LF in local SMTP input as a
1835 terminator too. Treat EOF as a line terminator always. */
1836
1837 if (ch == EOF) goto EOL;
1838
1839 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1840 other MTAs accept this. We are therefore forced into this "liberalisation"
1841 too, so we accept LF as a line terminator whatever the source of the message.
1842 However, if the first line of the message ended with a CRLF, we treat a bare
1843 LF specially by inserting a white space after it to ensure that the header
1844 line is not terminated. */
1845
1846 if (ch == '\n')
1847 {
1848 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1849 else if (first_line_ended_crlf) receive_ungetc(' ');
1850 goto EOL;
1851 }
1852
1853 /* This is not the end of the line. If this is SMTP input and this is
1854 the first character in the line and it is a "." character, ignore it.
1855 This implements the dot-doubling rule, though header lines starting with
1856 dots aren't exactly common. They are legal in RFC 822, though. If the
1857 following is CRLF or LF, this is the line that that terminates the
1858 entire message. We set message_ended to indicate this has happened (to
1859 prevent further reading), and break out of the loop, having freed the
1860 empty header, and set next = NULL to indicate no data line. */
1861
1862 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1863 {
1864 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1865 if (ch == '\r')
1866 {
1867 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1868 if (ch != '\n')
1869 {
1870 receive_ungetc(ch);
1871 ch = '\r'; /* Revert to CR */
1872 }
1873 }
1874 if (ch == '\n')
1875 {
1876 message_ended = END_DOT;
1877 store_reset(next);
1878 next = NULL;
1879 break; /* End character-reading loop */
1880 }
1881
1882 /* For non-SMTP input, the dot at the start of the line was really a data
1883 character. What is now in ch is the following character. We guaranteed
1884 enough space for this above. */
1885
1886 if (!smtp_input)
1887 {
1888 next->text[ptr++] = '.';
1889 message_size++;
1890 }
1891 }
1892
1893 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1894 remember this case if this is the first line ending. */
1895
1896 if (ch == '\r')
1897 {
1898 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1899 if (ch == '\n')
1900 {
1901 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1902 goto EOL;
1903 }
1904
1905 /* Otherwise, put back the character after CR, and turn the bare CR
1906 into LF SP. */
1907
1908 ch = (receive_ungetc)(ch);
1909 next->text[ptr++] = '\n';
1910 message_size++;
1911 ch = ' ';
1912 }
1913
1914 /* We have a data character for the header line. */
1915
1916 next->text[ptr++] = ch; /* Add to buffer */
1917 message_size++; /* Total message size so far */
1918
1919 /* Handle failure due to a humungously long header section. The >= allows
1920 for the terminating \n. Add what we have so far onto the headers list so
1921 that it gets reflected in any error message, and back up the just-read
1922 character. */
1923
1924 if (message_size >= header_maxsize)
1925 {
1926 next->text[ptr] = 0;
1927 next->slen = ptr;
1928 next->type = htype_other;
1929 next->next = NULL;
1930 header_last->next = next;
1931 header_last = next;
1932
1933 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1934 "%s (more than %d characters): message abandoned",
1935 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1936
1937 if (smtp_input)
1938 {
1939 smtp_reply = US"552 Message header is ridiculously long";
1940 receive_swallow_smtp();
1941 goto TIDYUP; /* Skip to end of function */
1942 }
1943
1944 else
1945 {
1946 give_local_error(ERRMESS_VLONGHEADER,
1947 string_sprintf("message header longer than %d characters received: "
1948 "message not accepted", header_maxsize), US"", error_rc, stdin,
1949 header_list->next);
1950 /* Does not return */
1951 }
1952 }
1953
1954 continue; /* With next input character */
1955
1956 /* End of header line reached */
1957
1958 EOL:
1959
1960 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1961
1962 receive_linecount++;
1963 message_linecount++;
1964
1965 /* Keep track of maximum line length */
1966
1967 if (ptr - prevlines_length > max_received_linelength)
1968 max_received_linelength = ptr - prevlines_length;
1969 prevlines_length = ptr + 1;
1970
1971 /* Now put in the terminating newline. There is always space for
1972 at least two more characters. */
1973
1974 next->text[ptr++] = '\n';
1975 message_size++;
1976
1977 /* A blank line signals the end of the headers; release the unwanted
1978 space and set next to NULL to indicate this. */
1979
1980 if (ptr == 1)
1981 {
1982 store_reset(next);
1983 next = NULL;
1984 break;
1985 }
1986
1987 /* There is data in the line; see if the next input character is a
1988 whitespace character. If it is, we have a continuation of this header line.
1989 There is always space for at least one character at this point. */
1990
1991 if (ch != EOF)
1992 {
1993 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1994 if (nextch == ' ' || nextch == '\t')
1995 {
1996 next->text[ptr++] = nextch;
1997 message_size++;
1998 continue; /* Iterate the loop */
1999 }
2000 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2001 else ch = EOF; /* Cause main loop to exit at end */
2002 }
2003
2004 /* We have got to the real line end. Terminate the string and release store
2005 beyond it. If it turns out to be a real header, internal binary zeros will
2006 be squashed later. */
2007
2008 next->text[ptr] = 0;
2009 next->slen = ptr;
2010 store_reset(next->text + ptr + 1);
2011
2012 /* Check the running total size against the overall message size limit. We
2013 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2014 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2015 headers - the code to read the body will then also hit the buffer. */
2016
2017 if (message_size > thismessage_size_limit) break;
2018
2019 /* A line that is not syntactically correct for a header also marks
2020 the end of the headers. In this case, we leave next containing the
2021 first data line. This might actually be several lines because of the
2022 continuation logic applied above, but that doesn't matter.
2023
2024 It turns out that smail, and presumably sendmail, accept leading lines
2025 of the form
2026
2027 From ph10 Fri Jan 5 12:35 GMT 1996
2028
2029 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2030 find any documentation of this, but for compatibility it had better be
2031 accepted. Exim restricts it to the case of non-smtp messages, and
2032 treats it as an alternative to the -f command line option. Thus it is
2033 ignored except for trusted users or filter testing. Otherwise it is taken
2034 as the sender address, unless -f was used (sendmail compatibility).
2035
2036 It further turns out that some UUCPs generate the From_line in a different
2037 format, e.g.
2038
2039 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2040
2041 The regex for matching these things is now capable of recognizing both
2042 formats (including 2- and 4-digit years in the latter). In fact, the regex
2043 is now configurable, as is the expansion string to fish out the sender.
2044
2045 Even further on it has been discovered that some broken clients send
2046 these lines in SMTP messages. There is now an option to ignore them from
2047 specified hosts or networks. Sigh. */
2048
2049 if (header_last == header_list &&
2050 (!smtp_input
2051 ||
2052 (sender_host_address != NULL &&
2053 verify_check_host(&ignore_fromline_hosts) == OK)
2054 ||
2055 (sender_host_address == NULL && ignore_fromline_local)
2056 ) &&
2057 regex_match_and_setup(regex_From, next->text, 0, -1))
2058 {
2059 if (!sender_address_forced)
2060 {
2061 uschar *uucp_sender = expand_string(uucp_from_sender);
2062 if (uucp_sender == NULL)
2063 {
2064 log_write(0, LOG_MAIN|LOG_PANIC,
2065 "expansion of \"%s\" failed after matching "
2066 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2067 }
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 != NULL)
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 {
2170 give_local_error(ERRMESS_VLONGHDRLINE,
2171 string_sprintf("message header line longer than %d characters "
2172 "received: message not accepted", header_line_maxsize), US"",
2173 error_rc, stdin, header_list->next);
2174 /* Does not return */
2175 }
2176 }
2177
2178 /* Note if any resent- fields exist. */
2179
2180 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2181 {
2182 resents_exist = TRUE;
2183 resent_prefix = US"Resent-";
2184 }
2185 }
2186
2187 /* Reject CHUNKING messages that do not CRLF their first header line */
2188
2189 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2190 {
2191 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2192 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2193 sender_address,
2194 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2195 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2196 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2197 bdat_flush_data();
2198 smtp_reply = US"";
2199 goto TIDYUP; /* Skip to end of function */
2200 }
2201
2202 /* The line has been handled. If we have hit EOF, break out of the loop,
2203 indicating no pending data line. */
2204
2205 if (ch == EOF) { next = NULL; break; }
2206
2207 /* Set up for the next header */
2208
2209 header_size = 256;
2210 next = store_get(sizeof(header_line));
2211 next->text = store_get(header_size);
2212 ptr = 0;
2213 had_zero = 0;
2214 prevlines_length = 0;
2215 } /* Continue, starting to read the next header */
2216
2217 /* At this point, we have read all the headers into a data structure in main
2218 store. The first header is still the dummy placeholder for the Received: header
2219 we are going to generate a bit later on. If next != NULL, it contains the first
2220 data line - which terminated the headers before reaching a blank line (not the
2221 normal case). */
2222
2223 DEBUG(D_receive)
2224 {
2225 debug_printf(">>Headers received:\n");
2226 for (h = header_list->next; h; h = h->next)
2227 debug_printf("%s", h->text);
2228 debug_printf("\n");
2229 }
2230
2231 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2232 is dropped immediately after valid headers, the next thing we will see is EOF.
2233 We must test for this specially, as further down the reading of the data is
2234 skipped if already at EOF. */
2235
2236 if (smtp_input && (receive_feof)())
2237 {
2238 smtp_reply = handle_lost_connection(US" (after header)");
2239 smtp_yield = FALSE;
2240 goto TIDYUP; /* Skip to end of function */
2241 }
2242
2243 /* If this is a filter test run and no headers were read, output a warning
2244 in case there is a mistake in the test message. */
2245
2246 if (filter_test != FTEST_NONE && header_list->next == NULL)
2247 printf("Warning: no message headers read\n");
2248
2249
2250 /* Scan the headers to identify them. Some are merely marked for later
2251 processing; some are dealt with here. */
2252
2253 for (h = header_list->next; h; h = h->next)
2254 {
2255 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2256 if (is_resent) contains_resent_headers = TRUE;
2257
2258 switch (header_checkname(h, is_resent))
2259 {
2260 case htype_bcc:
2261 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2262 break;
2263
2264 case htype_cc:
2265 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2266 break;
2267
2268 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2269
2270 case htype_date:
2271 if (!resents_exist || is_resent) date_header_exists = TRUE;
2272 break;
2273
2274 /* Same comments as about Return-Path: below. */
2275
2276 case htype_delivery_date:
2277 if (delivery_date_remove) h->type = htype_old;
2278 break;
2279
2280 /* Same comments as about Return-Path: below. */
2281
2282 case htype_envelope_to:
2283 if (envelope_to_remove) h->type = htype_old;
2284 break;
2285
2286 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2287 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2288 header consists of just the login id of the user who called Exim, rewrite
2289 it with the gecos field first. Apply this rule to Resent-From: if there
2290 are resent- fields. */
2291
2292 case htype_from:
2293 h->type = htype_from;
2294 if (!resents_exist || is_resent)
2295 {
2296 from_header = h;
2297 if (!smtp_input)
2298 {
2299 int len;
2300 uschar *s = Ustrchr(h->text, ':') + 1;
2301 while (isspace(*s)) s++;
2302 len = h->slen - (s - h->text) - 1;
2303 if (Ustrlen(originator_login) == len &&
2304 strncmpic(s, originator_login, len) == 0)
2305 {
2306 uschar *name = is_resent? US"Resent-From" : US"From";
2307 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2308 originator_login, qualify_domain_sender);
2309 from_header = header_last;
2310 h->type = htype_old;
2311 DEBUG(D_receive|D_rewrite)
2312 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2313 }
2314 }
2315 }
2316 break;
2317
2318 /* Identify the Message-id: header for generating "in-reply-to" in the
2319 autoreply transport. For incoming logging, save any resent- value. In both
2320 cases, take just the first of any multiples. */
2321
2322 case htype_id:
2323 if (msgid_header == NULL && (!resents_exist || is_resent))
2324 {
2325 msgid_header = h;
2326 h->type = htype_id;
2327 }
2328 break;
2329
2330 /* Flag all Received: headers */
2331
2332 case htype_received:
2333 h->type = htype_received;
2334 received_count++;
2335 break;
2336
2337 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2338
2339 case htype_reply_to:
2340 h->type = htype_reply_to;
2341 break;
2342
2343 /* The Return-path: header is supposed to be added to messages when
2344 they leave the SMTP system. We shouldn't receive messages that already
2345 contain Return-path. However, since Exim generates Return-path: on
2346 local delivery, resent messages may well contain it. We therefore
2347 provide an option (which defaults on) to remove any Return-path: headers
2348 on input. Removal actually means flagging as "old", which prevents the
2349 header being transmitted with the message. */
2350
2351 case htype_return_path:
2352 if (return_path_remove) h->type = htype_old;
2353
2354 /* If we are testing a mail filter file, use the value of the
2355 Return-Path: header to set up the return_path variable, which is not
2356 otherwise set. However, remove any <> that surround the address
2357 because the variable doesn't have these. */
2358
2359 if (filter_test != FTEST_NONE)
2360 {
2361 uschar *start = h->text + 12;
2362 uschar *end = start + Ustrlen(start);
2363 while (isspace(*start)) start++;
2364 while (end > start && isspace(end[-1])) end--;
2365 if (*start == '<' && end[-1] == '>')
2366 {
2367 start++;
2368 end--;
2369 }
2370 return_path = string_copyn(start, end - start);
2371 printf("Return-path taken from \"Return-path:\" header line\n");
2372 }
2373 break;
2374
2375 /* If there is a "Sender:" header and the message is locally originated,
2376 and from an untrusted caller and suppress_local_fixups is not set, or if we
2377 are in submission mode for a remote message, mark it "old" so that it will
2378 not be transmitted with the message, unless active_local_sender_retain is
2379 set. (This can only be true if active_local_from_check is false.) If there
2380 are any resent- headers in the message, apply this rule to Resent-Sender:
2381 instead of Sender:. Messages with multiple resent- header sets cannot be
2382 tidily handled. (For this reason, at least one MUA - Pine - turns old
2383 resent- headers into X-resent- headers when resending, leaving just one
2384 set.) */
2385
2386 case htype_sender:
2387 h->type = ((!active_local_sender_retain &&
2388 (
2389 (sender_local && !trusted_caller && !suppress_local_fixups)
2390 || submission_mode
2391 )
2392 ) &&
2393 (!resents_exist||is_resent))?
2394 htype_old : htype_sender;
2395 break;
2396
2397 /* Remember the Subject: header for logging. There is no Resent-Subject */
2398
2399 case htype_subject:
2400 subject_header = h;
2401 break;
2402
2403 /* "To:" gets flagged, and the existence of a recipient header is noted,
2404 whether it's resent- or not. */
2405
2406 case htype_to:
2407 h->type = htype_to;
2408 /****
2409 to_or_cc_header_exists = TRUE;
2410 ****/
2411 break;
2412 }
2413 }
2414
2415 /* Extract recipients from the headers if that is required (the -t option).
2416 Note that this is documented as being done *before* any address rewriting takes
2417 place. There are two possibilities:
2418
2419 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2420 recipients already listed are to be REMOVED from the message. Smail 3 works
2421 like this. We need to build a non-recipients tree for that list, because in
2422 subsequent processing this data is held in a tree and that's what the
2423 spool_write_header() function expects. Make sure that non-recipient addresses
2424 are fully qualified and rewritten if necessary.
2425
2426 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2427 those in the command line arguments (and it is rumoured some other MTAs do
2428 this). Therefore, there is an option to make Exim behave this way.
2429
2430 *** Notes on "Resent-" header lines ***
2431
2432 The presence of resent-headers in the message makes -t horribly ambiguous.
2433 Experiments with sendmail showed that it uses recipients for all resent-
2434 headers, totally ignoring the concept of "sets of resent- headers" as described
2435 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2436 with all the addresses in one instance of each header.
2437
2438 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2439 error for -t if there were resent- headers in the message. However, after a
2440 discussion on the mailing list, I've learned that there are MUAs that use
2441 resent- headers with -t, and also that the stuff about sets of resent- headers
2442 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2443 message with -t and resent- header lines makes sure that only *its* resent-
2444 headers are present; previous ones are often renamed as X-resent- for example.
2445
2446 Consequently, Exim has been changed so that, if any resent- header lines are
2447 present, the recipients are taken from all of the appropriate resent- lines,
2448 and not from the ordinary To:, Cc:, etc. */
2449
2450 if (extract_recip)
2451 {
2452 int rcount = 0;
2453 error_block **bnext = &bad_addresses;
2454
2455 if (extract_addresses_remove_arguments)
2456 {
2457 while (recipients_count-- > 0)
2458 {
2459 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2460 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2461 tree_add_nonrecipient(s);
2462 }
2463 recipients_list = NULL;
2464 recipients_count = recipients_list_max = 0;
2465 }
2466
2467 /* Now scan the headers */
2468
2469 for (h = header_list->next; h; h = h->next)
2470 {
2471 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2472 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2473 {
2474 uschar *s = Ustrchr(h->text, ':') + 1;
2475 while (isspace(*s)) s++;
2476
2477 parse_allow_group = TRUE; /* Allow address group syntax */
2478
2479 while (*s != 0)
2480 {
2481 uschar *ss = parse_find_address_end(s, FALSE);
2482 uschar *recipient, *errmess, *p, *pp;
2483 int start, end, domain;
2484
2485 /* Check on maximum */
2486
2487 if (recipients_max > 0 && ++rcount > recipients_max)
2488 {
2489 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2490 US"message rejected: ", error_rc, stdin, NULL);
2491 /* Does not return */
2492 }
2493
2494 /* Make a copy of the address, and remove any internal newlines. These
2495 may be present as a result of continuations of the header line. The
2496 white space that follows the newline must not be removed - it is part
2497 of the header. */
2498
2499 pp = recipient = store_get(ss - s + 1);
2500 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2501 *pp = 0;
2502
2503 #ifdef SUPPORT_I18N
2504 {
2505 BOOL b = allow_utf8_domains;
2506 allow_utf8_domains = TRUE;
2507 #endif
2508 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2509 &domain, FALSE);
2510
2511 #ifdef SUPPORT_I18N
2512 if (string_is_utf8(recipient))
2513 message_smtputf8 = TRUE;
2514 else
2515 allow_utf8_domains = b;
2516 }
2517 #endif
2518
2519 /* Keep a list of all the bad addresses so we can send a single
2520 error message at the end. However, an empty address is not an error;
2521 just ignore it. This can come from an empty group list like
2522
2523 To: Recipients of list:;
2524
2525 If there are no recipients at all, an error will occur later. */
2526
2527 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2528 {
2529 int len = Ustrlen(s);
2530 error_block *b = store_get(sizeof(error_block));
2531 while (len > 0 && isspace(s[len-1])) len--;
2532 b->next = NULL;
2533 b->text1 = string_printing(string_copyn(s, len));
2534 b->text2 = errmess;
2535 *bnext = b;
2536 bnext = &(b->next);
2537 }
2538
2539 /* If the recipient is already in the nonrecipients tree, it must
2540 have appeared on the command line with the option extract_addresses_
2541 remove_arguments set. Do not add it to the recipients, and keep a note
2542 that this has happened, in order to give a better error if there are
2543 no recipients left. */
2544
2545 else if (recipient != NULL)
2546 {
2547 if (tree_search(tree_nonrecipients, recipient) == NULL)
2548 receive_add_recipient(recipient, -1);
2549 else
2550 extracted_ignored = TRUE;
2551 }
2552
2553 /* Move on past this address */
2554
2555 s = ss + (*ss? 1:0);
2556 while (isspace(*s)) s++;
2557 } /* Next address */
2558
2559 parse_allow_group = FALSE; /* Reset group syntax flags */
2560 parse_found_group = FALSE;
2561
2562 /* If this was the bcc: header, mark it "old", which means it
2563 will be kept on the spool, but not transmitted as part of the
2564 message. */
2565
2566 if (h->type == htype_bcc) h->type = htype_old;
2567 } /* For appropriate header line */
2568 } /* For each header line */
2569
2570 }
2571
2572 /* Now build the unique message id. This has changed several times over the
2573 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2574 Retaining all the history in the comment has become too unwieldy - read
2575 previous release sources if you want it.
2576
2577 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2578 The first part is the current time, in seconds. The second part is the current
2579 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2580 can hold a number in the range 0-3843. It used to be a computed sequence
2581 number, but is now the fractional component of the current time in units of
2582 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2583 received, Exim ensures that the timer has ticked at the appropriate level
2584 before proceeding, to avoid duplication if the pid happened to be re-used
2585 within the same time period. It seems likely that most messages will take at
2586 least half a millisecond to be received, so no delay will normally be
2587 necessary. At least for some time...
2588
2589 There is a modification when localhost_number is set. Formerly this was allowed
2590 to be as large as 255. Now it is restricted to the range 0-16, and the final
2591 component of the message id becomes (localhost_number * 200) + fractional time
2592 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2593
2594 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2595 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2596 still allows the tttttt field to hold a large enough number to last for some
2597 more decades, and the final two-digit field can hold numbers up to 1295, which
2598 is enough for milliseconds (instead of 1/2000 of a second).
2599
2600 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2601 pid, so it is probably safe because pids have to be positive. The
2602 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2603 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2604
2605 Note that string_base62() returns its data in a static storage block, so it
2606 must be copied before calling string_base62() again. It always returns exactly
2607 6 characters.
2608
2609 There doesn't seem to be anything in the RFC which requires a message id to
2610 start with a letter, but Smail was changed to ensure this. The external form of
2611 the message id (as supplied by string expansion) therefore starts with an
2612 additional leading 'E'. The spool file names do not include this leading
2613 letter and it is not used internally.
2614
2615 NOTE: If ever the format of message ids is changed, the regular expression for
2616 checking that a string is in this format must be updated in a corresponding
2617 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2618 must also be changed to reflect the correct string length. The queue-sort code
2619 needs to know the layout. Then, of course, other programs that rely on the
2620 message id format will need updating too. */
2621
2622 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2623 message_id[6] = '-';
2624 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2625
2626 /* Deal with the case where the host number is set. The value of the number was
2627 checked when it was read, to ensure it isn't too big. The timing granularity is
2628 left in id_resolution so that an appropriate wait can be done after receiving
2629 the message, if necessary (we hope it won't be). */
2630
2631 if (host_number_string != NULL)
2632 {
2633 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2634 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2635 string_base62((long int)(
2636 host_number * (1000000/id_resolution) +
2637 message_id_tv.tv_usec/id_resolution)) + 4);
2638 }
2639
2640 /* Host number not set: final field is just the fractional time at an
2641 appropriate resolution. */
2642
2643 else
2644 {
2645 id_resolution = (BASE_62 == 62)? 500 : 1000;
2646 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2647 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2648 }
2649
2650 /* Add the current message id onto the current process info string if
2651 it will fit. */
2652
2653 (void)string_format(process_info + process_info_len,
2654 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2655
2656 /* If we are using multiple input directories, set up the one for this message
2657 to be the least significant base-62 digit of the time of arrival. Otherwise
2658 ensure that it is an empty string. */
2659
2660 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2661
2662 /* Now that we have the message-id, if there is no message-id: header, generate
2663 one, but only for local (without suppress_local_fixups) or submission mode
2664 messages. This can be user-configured if required, but we had better flatten
2665 any illegal characters therein. */
2666
2667 if (msgid_header == NULL &&
2668 ((sender_host_address == NULL && !suppress_local_fixups)
2669 || submission_mode))
2670 {
2671 uschar *p;
2672 uschar *id_text = US"";
2673 uschar *id_domain = primary_hostname;
2674
2675 /* Permit only letters, digits, dots, and hyphens in the domain */
2676
2677 if (message_id_domain != NULL)
2678 {
2679 uschar *new_id_domain = expand_string(message_id_domain);
2680 if (new_id_domain == NULL)
2681 {
2682 if (!expand_string_forcedfail)
2683 log_write(0, LOG_MAIN|LOG_PANIC,
2684 "expansion of \"%s\" (message_id_header_domain) "
2685 "failed: %s", message_id_domain, expand_string_message);
2686 }
2687 else if (*new_id_domain != 0)
2688 {
2689 id_domain = new_id_domain;
2690 for (p = id_domain; *p != 0; p++)
2691 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2692 }
2693 }
2694
2695 /* Permit all characters except controls and RFC 2822 specials in the
2696 additional text part. */
2697
2698 if (message_id_text != NULL)
2699 {
2700 uschar *new_id_text = expand_string(message_id_text);
2701 if (new_id_text == NULL)
2702 {
2703 if (!expand_string_forcedfail)
2704 log_write(0, LOG_MAIN|LOG_PANIC,
2705 "expansion of \"%s\" (message_id_header_text) "
2706 "failed: %s", message_id_text, expand_string_message);
2707 }
2708 else if (*new_id_text != 0)
2709 {
2710 id_text = new_id_text;
2711 for (p = id_text; *p != 0; p++)
2712 if (mac_iscntrl_or_special(*p)) *p = '-';
2713 }
2714 }
2715
2716 /* Add the header line
2717 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2718 * appended, to preserve classical expectations of header ordering. */
2719
2720 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2721 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2722 (*id_text == 0)? "" : ".", id_text, id_domain);
2723 }
2724
2725 /* If we are to log recipients, keep a copy of the raw ones before any possible
2726 rewriting. Must copy the count, because later ACLs and the local_scan()
2727 function may mess with the real recipients. */
2728
2729 if (LOGGING(received_recipients))
2730 {
2731 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2732 for (i = 0; i < recipients_count; i++)
2733 raw_recipients[i] = string_copy(recipients_list[i].address);
2734 raw_recipients_count = recipients_count;
2735 }
2736
2737 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2738 recipients will get here only if the conditions were right (allow_unqualified_
2739 recipient is TRUE). */
2740
2741 for (i = 0; i < recipients_count; i++)
2742 recipients_list[i].address =
2743 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2744 global_rewrite_rules, rewrite_existflags);
2745
2746 /* If there is no From: header, generate one for local (without
2747 suppress_local_fixups) or submission_mode messages. If there is no sender
2748 address, but the sender is local or this is a local delivery error, use the
2749 originator login. This shouldn't happen for genuine bounces, but might happen
2750 for autoreplies. The addition of From: must be done *before* checking for the
2751 possible addition of a Sender: header, because untrusted_set_sender allows an
2752 untrusted user to set anything in the envelope (which might then get info
2753 From:) but we still want to ensure a valid Sender: if it is required. */
2754
2755 if (from_header == NULL &&
2756 ((sender_host_address == NULL && !suppress_local_fixups)
2757 || submission_mode))
2758 {
2759 uschar *oname = US"";
2760
2761 /* Use the originator_name if this is a locally submitted message and the
2762 caller is not trusted. For trusted callers, use it only if -F was used to
2763 force its value or if we have a non-SMTP message for which -f was not used
2764 to set the sender. */
2765
2766 if (sender_host_address == NULL)
2767 {
2768 if (!trusted_caller || sender_name_forced ||
2769 (!smtp_input && !sender_address_forced))
2770 oname = originator_name;
2771 }
2772
2773 /* For non-locally submitted messages, the only time we use the originator
2774 name is when it was forced by the /name= option on control=submission. */
2775
2776 else
2777 {
2778 if (submission_name != NULL) oname = submission_name;
2779 }
2780
2781 /* Envelope sender is empty */
2782
2783 if (sender_address[0] == 0)
2784 {
2785 uschar *fromstart, *fromend;
2786
2787 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2788 oname, (oname[0] == 0)? "" : " <");
2789 fromend = (oname[0] == 0)? US"" : US">";
2790
2791 if (sender_local || local_error_message)
2792 {
2793 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2794 local_part_quote(originator_login), qualify_domain_sender,
2795 fromend);
2796 }
2797 else if (submission_mode && authenticated_id != NULL)
2798 {
2799 if (submission_domain == NULL)
2800 {
2801 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2802 local_part_quote(authenticated_id), qualify_domain_sender,
2803 fromend);
2804 }
2805 else if (submission_domain[0] == 0) /* empty => whole address set */
2806 {
2807 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2808 fromend);
2809 }
2810 else
2811 {
2812 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2813 local_part_quote(authenticated_id), submission_domain,
2814 fromend);
2815 }
2816 from_header = header_last; /* To get it checked for Sender: */
2817 }
2818 }
2819
2820 /* There is a non-null envelope sender. Build the header using the original
2821 sender address, before any rewriting that might have been done while
2822 verifying it. */
2823
2824 else
2825 {
2826 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2827 oname,
2828 (oname[0] == 0)? "" : " <",
2829 (sender_address_unrewritten == NULL)?
2830 sender_address : sender_address_unrewritten,
2831 (oname[0] == 0)? "" : ">");
2832
2833 from_header = header_last; /* To get it checked for Sender: */
2834 }
2835 }
2836
2837
2838 /* If the sender is local (without suppress_local_fixups), or if we are in
2839 submission mode and there is an authenticated_id, check that an existing From:
2840 is correct, and if not, generate a Sender: header, unless disabled. Any
2841 previously-existing Sender: header was removed above. Note that sender_local,
2842 as well as being TRUE if the caller of exim is not trusted, is also true if a
2843 trusted caller did not supply a -f argument for non-smtp input. To allow
2844 trusted callers to forge From: without supplying -f, we have to test explicitly
2845 here. If the From: header contains more than one address, then the call to
2846 parse_extract_address fails, and a Sender: header is inserted, as required. */
2847
2848 if (from_header != NULL &&
2849 (active_local_from_check &&
2850 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2851 (submission_mode && authenticated_id != NULL))
2852 ))
2853 {
2854 BOOL make_sender = TRUE;
2855 int start, end, domain;
2856 uschar *errmess;
2857 uschar *from_address =
2858 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2859 &start, &end, &domain, FALSE);
2860 uschar *generated_sender_address;
2861
2862 if (submission_mode)
2863 {
2864 if (submission_domain == NULL)
2865 {
2866 generated_sender_address = string_sprintf("%s@%s",
2867 local_part_quote(authenticated_id), qualify_domain_sender);
2868 }
2869 else if (submission_domain[0] == 0) /* empty => full address */
2870 {
2871 generated_sender_address = string_sprintf("%s",
2872 authenticated_id);
2873 }
2874 else
2875 {
2876 generated_sender_address = string_sprintf("%s@%s",
2877 local_part_quote(authenticated_id), submission_domain);
2878 }
2879 }
2880 else
2881 generated_sender_address = string_sprintf("%s@%s",
2882 local_part_quote(originator_login), qualify_domain_sender);
2883
2884 /* Remove permitted prefixes and suffixes from the local part of the From:
2885 address before doing the comparison with the generated sender. */
2886
2887 if (from_address != NULL)
2888 {
2889 int slen;
2890 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2891
2892 if (at != NULL) *at = 0;
2893 from_address += route_check_prefix(from_address, local_from_prefix);
2894 slen = route_check_suffix(from_address, local_from_suffix);
2895 if (slen > 0)
2896 {
2897 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2898 from_address += slen;
2899 }
2900 if (at != NULL) *at = '@';
2901
2902 if (strcmpic(generated_sender_address, from_address) == 0 ||
2903 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2904 make_sender = FALSE;
2905 }
2906
2907 /* We have to cause the Sender header to be rewritten if there are
2908 appropriate rewriting rules. */
2909
2910 if (make_sender)
2911 {
2912 if (submission_mode && submission_name == NULL)
2913 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2914 generated_sender_address);
2915 else
2916 header_add(htype_sender, "%sSender: %s <%s>\n",
2917 resent_prefix,
2918 submission_mode? submission_name : originator_name,
2919 generated_sender_address);
2920 }
2921
2922 /* Ensure that a non-null envelope sender address corresponds to the
2923 submission mode sender address. */
2924
2925 if (submission_mode && sender_address[0] != 0)
2926 {
2927 if (sender_address_unrewritten == NULL)
2928 sender_address_unrewritten = sender_address;
2929 sender_address = generated_sender_address;
2930 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2931 log_write(L_address_rewrite, LOG_MAIN,
2932 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2933 sender_address_unrewritten, generated_sender_address);
2934 }
2935 }
2936
2937 /* If there are any rewriting rules, apply them to the sender address, unless
2938 it has already been rewritten as part of verification for SMTP input. */
2939
2940 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2941 sender_address[0] != 0)
2942 {
2943 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2944 global_rewrite_rules, rewrite_existflags);
2945 DEBUG(D_receive|D_rewrite)
2946 debug_printf("rewritten sender = %s\n", sender_address);
2947 }
2948
2949
2950 /* The headers must be run through rewrite_header(), because it ensures that
2951 addresses are fully qualified, as well as applying any rewriting rules that may
2952 exist.
2953
2954 Qualification of header addresses in a message from a remote host happens only
2955 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2956 appropriate. For local messages, qualification always happens, unless -bnq is
2957 used to explicitly suppress it. No rewriting is done for an unqualified address
2958 that is left untouched.
2959
2960 We start at the second header, skipping our own Received:. This rewriting is
2961 documented as happening *after* recipient addresses are taken from the headers
2962 by the -t command line option. An added Sender: gets rewritten here. */
2963
2964 for (h = header_list->next; h; h = h->next)
2965 {
2966 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2967 rewrite_existflags, TRUE);
2968 if (newh) h = newh;
2969 }
2970
2971
2972 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2973 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2974 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2975 exists, this applies to the set of resent- headers rather than the normal set.
2976
2977 The requirement for a recipient header has been removed in RFC 2822. At this
2978 point in the code, earlier versions of Exim added a To: header for locally
2979 submitted messages, and an empty Bcc: header for others. In the light of the
2980 changes in RFC 2822, this was dropped in November 2003. */
2981
2982
2983 /* If there is no date header, generate one if the message originates locally
2984 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2985 submission mode flag is set. Messages without Date: are not valid, but it seems
2986 to be more confusing if Exim adds one to all remotely-originated messages.
2987 As per Message-Id, we prepend if resending, else append.
2988 */
2989
2990 if (!date_header_exists &&
2991 ((sender_host_address == NULL && !suppress_local_fixups)
2992 || submission_mode))
2993 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2994 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2995
2996 search_tidyup(); /* Free any cached resources */
2997
2998 /* Show the complete set of headers if debugging. Note that the first one (the
2999 new Received:) has not yet been set. */
3000
3001 DEBUG(D_receive)
3002 {
3003 debug_printf(">>Headers after rewriting and local additions:\n");
3004 for (h = header_list->next; h != NULL; h = h->next)
3005 debug_printf("%c %s", h->type, h->text);
3006 debug_printf("\n");
3007 }
3008
3009 /* The headers are now complete in store. If we are running in filter
3010 testing mode, that is all this function does. Return TRUE if the message
3011 ended with a dot. */
3012
3013 if (filter_test != FTEST_NONE)
3014 {
3015 process_info[process_info_len] = 0;
3016 return message_ended == END_DOT;
3017 }
3018
3019 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3020 think more if it could be handled. Cannot do onward CHUNKING unless
3021 inbound is, but inbound chunking ought to be ok with outbound plain.
3022 Could we do onward CHUNKING given inbound CHUNKING?
3023 */
3024 if (chunking_state > CHUNKING_OFFERED)
3025 cancel_cutthrough_connection(FALSE, US"chunking active");
3026
3027 /* Cutthrough delivery:
3028 We have to create the Received header now rather than at the end of reception,
3029 so the timestamp behaviour is a change to the normal case.
3030 Having created it, send the headers to the destination. */
3031
3032 if (cutthrough.fd >= 0 && cutthrough.delivery)
3033 {
3034 if (received_count > received_headers_max)
3035 {
3036 cancel_cutthrough_connection(TRUE, US"too many headers");
3037 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3038 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3039 "Too many \"Received\" headers",
3040 sender_address,
3041 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3042 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3043 message_id[0] = 0; /* Indicate no message accepted */
3044 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3045 goto TIDYUP; /* Skip to end of function */
3046 }
3047 received_header_gen();
3048 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3049 (void) cutthrough_headers_send();
3050 }
3051
3052
3053 /* Open a new spool file for the data portion of the message. We need
3054 to access it both via a file descriptor and a stream. Try to make the
3055 directory if it isn't there. */
3056
3057 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3058 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3059
3060 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3061 {
3062 if (errno == ENOENT)
3063 {
3064 (void) directory_make(spool_directory,
3065 spool_sname(US"input", message_subdir),
3066 INPUT_DIRECTORY_MODE, TRUE);
3067 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3068 }
3069 if (data_fd < 0)
3070 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3071 spool_name, strerror(errno));
3072 }
3073
3074 /* Make sure the file's group is the Exim gid, and double-check the mode
3075 because the group setting doesn't always get set automatically. */
3076
3077 if (fchown(data_fd, exim_uid, exim_gid))
3078 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3079 "Failed setting ownership on spool file %s: %s",
3080 spool_name, strerror(errno));
3081 (void)fchmod(data_fd, SPOOL_MODE);
3082
3083 /* We now have data file open. Build a stream for it and lock it. We lock only
3084 the first line of the file (containing the message ID) because otherwise there
3085 are problems when Exim is run under Cygwin (I'm told). See comments in
3086 spool_in.c, where the same locking is done. */
3087
3088 data_file = fdopen(data_fd, "w+");
3089 lock_data.l_type = F_WRLCK;
3090 lock_data.l_whence = SEEK_SET;
3091 lock_data.l_start = 0;
3092 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3093
3094 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3095 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3096 errno, strerror(errno));
3097
3098 /* We have an open, locked data file. Write the message id to it to make it
3099 self-identifying. Then read the remainder of the input of this message and
3100 write it to the data file. If the variable next != NULL, it contains the first
3101 data line (which was read as a header but then turned out not to have the right
3102 format); write it (remembering that it might contain binary zeros). The result
3103 of fwrite() isn't inspected; instead we call ferror() below. */
3104
3105 fprintf(data_file, "%s-D\n", message_id);
3106 if (next != NULL)
3107 {
3108 uschar *s = next->text;
3109 int len = next->slen;
3110 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3111 body_linecount++; /* Assumes only 1 line */
3112 }
3113
3114 /* Note that we might already be at end of file, or the logical end of file
3115 (indicated by '.'), or might have encountered an error while writing the
3116 message id or "next" line. */
3117
3118 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3119 {
3120 if (smtp_input)
3121 {
3122 message_ended = chunking_state <= CHUNKING_OFFERED
3123 ? read_message_data_smtp(data_file)
3124 : spool_wireformat
3125 ? read_message_bdat_smtp_wire(data_file)
3126 : read_message_bdat_smtp(data_file);
3127 receive_linecount++; /* The terminating "." line */
3128 }
3129 else message_ended = read_message_data(data_file);
3130
3131 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3132 message_linecount += body_linecount;
3133
3134 switch (message_ended)
3135 {
3136 /* Handle premature termination of SMTP */
3137
3138 case END_EOF:
3139 if (smtp_input)
3140 {
3141 Uunlink(spool_name); /* Lose data file when closed */
3142 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3143 message_id[0] = 0; /* Indicate no message accepted */
3144 smtp_reply = handle_lost_connection(US"");
3145 smtp_yield = FALSE;
3146 goto TIDYUP; /* Skip to end of function */
3147 }
3148 break;
3149
3150 /* Handle message that is too big. Don't use host_or_ident() in the log
3151 message; we want to see the ident value even for non-remote messages. */
3152
3153 case END_SIZE:
3154 Uunlink(spool_name); /* Lose the data file when closed */
3155 cancel_cutthrough_connection(TRUE, US"mail too big");
3156 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3157
3158 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3159 "message too big: read=%d max=%d",
3160 sender_address,
3161 (sender_fullhost == NULL)? "" : " H=",
3162 (sender_fullhost == NULL)? US"" : sender_fullhost,
3163 (sender_ident == NULL)? "" : " U=",
3164 (sender_ident == NULL)? US"" : sender_ident,
3165 message_size,
3166 thismessage_size_limit);
3167
3168 if (smtp_input)
3169 {
3170 smtp_reply = US"552 Message size exceeds maximum permitted";
3171 message_id[0] = 0; /* Indicate no message accepted */
3172 goto TIDYUP; /* Skip to end of function */
3173 }
3174 else
3175 {
3176 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3177 give_local_error(ERRMESS_TOOBIG,
3178 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3179 US"message rejected: ", error_rc, data_file, header_list);
3180 /* Does not return */
3181 }
3182 break;
3183
3184 /* Handle bad BDAT protocol sequence */
3185
3186 case END_PROTOCOL:
3187 Uunlink(spool_name); /* Lose the data file when closed */
3188 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3189 smtp_reply = US""; /* Response already sent */
3190 message_id[0] = 0; /* Indicate no message accepted */
3191 goto TIDYUP; /* Skip to end of function */
3192 }
3193 }
3194
3195 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3196 example, there may be some expansion in an ACL that uses a timer.) */
3197
3198 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3199
3200 /* The message body has now been read into the data file. Call fflush() to
3201 empty the buffers in C, and then call fsync() to get the data written out onto
3202 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3203 having to do this). If there was an I/O error on either input or output,
3204 attempt to send an error message, and unlink the spool file. For non-SMTP input
3205 we can then give up. Note that for SMTP input we must swallow the remainder of
3206 the input in cases of output errors, since the far end doesn't expect to see
3207 anything until the terminating dot line is sent. */
3208
3209 if (fflush(data_file) == EOF || ferror(data_file) ||
3210 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3211 {
3212 uschar *msg_errno = US strerror(errno);
3213 BOOL input_error = (receive_ferror)() != 0;
3214 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3215 input_error? "Input read" : "Spool write",
3216 msg_errno,
3217 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3218
3219 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3220 Uunlink(spool_name); /* Lose the data file */
3221 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3222
3223 if (smtp_input)
3224 {
3225 if (input_error)
3226 smtp_reply = US"451 Error while reading input data";
3227 else
3228 {
3229 smtp_reply = US"451 Error while writing spool file";
3230 receive_swallow_smtp();
3231 }
3232 message_id[0] = 0; /* Indicate no message accepted */
3233 goto TIDYUP; /* Skip to end of function */
3234 }
3235
3236 else
3237 {
3238 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3239 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3240 header_list);
3241 /* Does not return */
3242 }
3243 }
3244
3245
3246 /* No I/O errors were encountered while writing the data file. */
3247
3248 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3249
3250
3251 /* If there were any bad addresses extracted by -t, or there were no recipients
3252 left after -t, send a message to the sender of this message, or write it to
3253 stderr if the error handling option is set that way. Note that there may
3254 legitimately be no recipients for an SMTP message if they have all been removed
3255 by "discard".
3256
3257 We need to rewind the data file in order to read it. In the case of no
3258 recipients or stderr error writing, throw the data file away afterwards, and
3259 exit. (This can't be SMTP, which always ensures there's at least one
3260 syntactically good recipient address.) */
3261
3262 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3263 {
3264 DEBUG(D_receive)
3265 {
3266 if (recipients_count == 0) debug_printf("*** No recipients\n");
3267 if (bad_addresses != NULL)
3268 {
3269 error_block *eblock = bad_addresses;
3270 debug_printf("*** Bad address(es)\n");
3271 while (eblock != NULL)
3272 {
3273 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3274 eblock = eblock->next;
3275 }
3276 }
3277 }
3278
3279 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3280
3281 /* If configured to send errors to the sender, but this fails, force
3282 a failure error code. We use a special one for no recipients so that it
3283 can be detected by the autoreply transport. Otherwise error_rc is set to
3284 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3285 it is EXIT_SUCCESS. */
3286
3287 if (error_handling == ERRORS_SENDER)
3288 {
3289 if (!moan_to_sender(
3290 (bad_addresses == NULL)?
3291 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3292 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3293 bad_addresses, header_list, data_file, FALSE))
3294 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3295 }
3296 else
3297 {
3298 if (bad_addresses == NULL)
3299 {
3300 if (extracted_ignored)
3301 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3302 else
3303 fprintf(stderr, "exim: no recipients in message\n");
3304 }
3305 else
3306 {
3307 fprintf(stderr, "exim: invalid address%s",
3308 (bad_addresses->next == NULL)? ":" : "es:\n");
3309 while (bad_addresses != NULL)
3310 {
3311 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3312 bad_addresses->text2);
3313 bad_addresses = bad_addresses->next;
3314 }
3315 }
3316 }
3317
3318 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3319 {
3320 Uunlink(spool_name);
3321 (void)fclose(data_file);
3322 exim_exit(error_rc, US"receiving");
3323 }
3324 }
3325
3326 /* Data file successfully written. Generate text for the Received: header by
3327 expanding the configured string, and adding a timestamp. By leaving this
3328 operation till now, we ensure that the timestamp is the time that message
3329 reception was completed. However, this is deliberately done before calling the
3330 data ACL and local_scan().
3331
3332 This Received: header may therefore be inspected by the data ACL and by code in
3333 the local_scan() function. When they have run, we update the timestamp to be
3334 the final time of reception.
3335
3336 If there is just one recipient, set up its value in the $received_for variable
3337 for use when we generate the Received: header.
3338
3339 Note: the checking for too many Received: headers is handled by the delivery
3340 code. */
3341 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3342
3343 if (received_header->text == NULL) /* Non-cutthrough case */
3344 {
3345 received_header_gen();
3346
3347 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3348
3349 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3350 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3351
3352 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3353 now, before running the DATA ACL. */
3354
3355 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3356 }
3357 else
3358 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3359 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3360
3361 /* If an ACL is specified for checking things at this stage of reception of a
3362 message, run it, unless all the recipients were removed by "discard" in earlier
3363 ACLs. That is the only case in which recipients_count can be zero at this
3364 stage. Set deliver_datafile to point to the data file so that $message_body and
3365 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3366 */
3367
3368 deliver_datafile = data_fd;
3369 user_msg = NULL;
3370
3371 enable_dollar_recipients = TRUE;
3372
3373 if (recipients_count == 0)
3374 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3375
3376 else
3377 {
3378 /* Handle interactive SMTP messages */
3379
3380 if (smtp_input && !smtp_batched_input)
3381 {
3382
3383 #ifndef DISABLE_DKIM
3384 if (!dkim_disable_verify)
3385 {
3386 /* Finish verification */
3387 dkim_exim_verify_finish();
3388
3389 /* Check if we must run the DKIM ACL */
3390 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3391 {
3392 uschar * dkim_verify_signers_expanded =
3393 expand_string(dkim_verify_signers);
3394 gstring * results = NULL;
3395 int signer_sep = 0;
3396 const uschar * ptr;
3397 uschar * item;
3398 gstring * seen_items = NULL;
3399 int old_pool = store_pool;
3400
3401 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3402
3403 if (!(ptr = dkim_verify_signers_expanded))
3404 log_write(0, LOG_MAIN|LOG_PANIC,
3405 "expansion of dkim_verify_signers option failed: %s",
3406 expand_string_message);
3407
3408 /* Default to OK when no items are present */
3409 rc = OK;
3410 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3411 {
3412 /* Prevent running ACL for an empty item */
3413 if (!item || !*item) continue;
3414
3415 /* Only run ACL once for each domain or identity,
3416 no matter how often it appears in the expanded list. */
3417 if (seen_items)
3418 {
3419 uschar * seen_item;
3420 const uschar * seen_items_list = string_from_gstring(seen_items);
3421 int seen_sep = ':';
3422 BOOL seen_this_item = FALSE;
3423
3424 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3425 NULL, 0)))
3426 if (Ustrcmp(seen_item,item) == 0)
3427 {
3428 seen_this_item = TRUE;
3429 break;
3430 }
3431
3432 if (seen_this_item)
3433 {
3434 DEBUG(D_receive)
3435 debug_printf("acl_smtp_dkim: skipping signer %s, "
3436 "already seen\n", item);
3437 continue;
3438 }
3439
3440 seen_items = string_catn(seen_items, ":", 1);
3441 }
3442 seen_items = string_cat(seen_items, item);
3443
3444 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3445 if (rc != OK)
3446 {
3447 DEBUG(D_receive)
3448 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3449 "skipping remaining items\n", rc, item);
3450 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3451 break;
3452 }
3453 }
3454 dkim_verify_status = string_from_gstring(results);
3455 store_pool = old_pool;
3456 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3457 if (rc == DISCARD)
3458 {
3459 recipients_count = 0;
3460 blackholed_by = US"DKIM ACL";
3461 if (log_msg)
3462 blackhole_log_msg = string_sprintf(": %s", log_msg);
3463 }
3464 else if (rc != OK)
3465 {
3466 Uunlink(spool_name);
3467 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3468 smtp_yield = FALSE; /* No more messages after dropped connection */
3469 smtp_reply = US""; /* Indicate reply already sent */
3470 message_id[0] = 0; /* Indicate no message accepted */
3471 goto TIDYUP; /* Skip to end of function */
3472 }
3473 }
3474 else
3475 dkim_exim_verify_log_all();
3476 }
3477 #endif /* DISABLE_DKIM */
3478
3479 #ifdef WITH_CONTENT_SCAN
3480 if (recipients_count > 0 &&
3481 acl_smtp_mime != NULL &&
3482 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3483 goto TIDYUP;
3484 #endif /* WITH_CONTENT_SCAN */
3485
3486 #ifdef EXPERIMENTAL_DMARC
3487 dmarc_up = dmarc_store_data(from_header);
3488 #endif /* EXPERIMENTAL_DMARC */
3489
3490 #ifndef DISABLE_PRDR
3491 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3492 {
3493 unsigned int c;
3494 int all_pass = OK;
3495 int all_fail = FAIL;
3496
3497 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3498 /* Loop through recipients, responses must be in same order received */
3499 for (c = 0; recipients_count > c; c++)
3500 {
3501 uschar * addr= recipients_list[c].address;
3502 uschar * msg= US"PRDR R=<%s> %s";
3503 uschar * code;
3504 DEBUG(D_receive)
3505 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3506 addr, c+1, recipients_count);
3507 rc = acl_check(ACL_WHERE_PRDR, addr,
3508 acl_smtp_data_prdr, &user_msg, &log_msg);
3509
3510 /* If any recipient rejected content, indicate it in final message */
3511 all_pass |= rc;
3512 /* If all recipients rejected, indicate in final message */
3513 all_fail &= rc;
3514
3515 switch (rc)
3516 {
3517 case OK: case DISCARD: code = US"250"; break;
3518 case DEFER: code = US"450"; break;
3519 default: code = US"550"; break;
3520 }
3521 if (user_msg != NULL)
3522 smtp_user_msg(code, user_msg);
3523 else
3524 {
3525 switch (rc)
3526 {
3527 case OK: case DISCARD:
3528 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3529 case DEFER:
3530 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3531 default:
3532 msg = string_sprintf(CS msg, addr, "refusal"); break;
3533 }
3534 smtp_user_msg(code, msg);
3535 }
3536 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3537 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3538 else log_write(0, LOG_MAIN, "%s", CS msg);
3539
3540 if (rc != OK) { receive_remove_recipient(addr); c--; }
3541 }
3542 /* Set up final message, used if data acl gives OK */
3543 smtp_reply = string_sprintf("%s id=%s message %s",
3544 all_fail == FAIL ? US"550" : US"250",
3545 message_id,
3546 all_fail == FAIL
3547 ? US"rejected for all recipients"
3548 : all_pass == OK
3549 ? US"accepted"
3550 : US"accepted for some recipients");
3551 if (recipients_count == 0)
3552 {
3553 message_id[0] = 0; /* Indicate no message accepted */
3554 goto TIDYUP;
3555 }
3556 }
3557 else
3558 prdr_requested = FALSE;
3559 #endif /* !DISABLE_PRDR */
3560
3561 /* Check the recipients count again, as the MIME ACL might have changed
3562 them. */
3563
3564 if (acl_smtp_data != NULL && recipients_count > 0)
3565 {
3566 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3567 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3568 if (rc == DISCARD)
3569 {
3570 recipients_count = 0;
3571 blackholed_by = US"DATA ACL";
3572 if (log_msg)
3573 blackhole_log_msg = string_sprintf(": %s", log_msg);
3574 cancel_cutthrough_connection(TRUE, US"data acl discard");
3575 }
3576 else if (rc != OK)
3577 {
3578 Uunlink(spool_name);
3579 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3580 #ifdef WITH_CONTENT_SCAN
3581 unspool_mbox();
3582 #endif
3583 #ifdef EXPERIMENTAL_DCC
3584 dcc_ok = 0;
3585 #endif
3586 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3587 smtp_yield = FALSE; /* No more messages after dropped connection */
3588 smtp_reply = US""; /* Indicate reply already sent */
3589 message_id[0] = 0; /* Indicate no message accepted */
3590 goto TIDYUP; /* Skip to end of function */
3591 }
3592 }
3593 }
3594
3595 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3596 we cannot take different actions for permanent and temporary rejections. */
3597
3598 else
3599 {
3600
3601 #ifdef WITH_CONTENT_SCAN
3602 if (acl_not_smtp_mime != NULL &&
3603 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3604 &blackholed_by))
3605 goto TIDYUP;
3606 #endif /* WITH_CONTENT_SCAN */
3607
3608 if (acl_not_smtp != NULL)
3609 {
3610 uschar *user_msg, *log_msg;
3611 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3612 if (rc == DISCARD)
3613 {
3614 recipients_count = 0;
3615 blackholed_by = US"non-SMTP ACL";
3616 if (log_msg != NULL)
3617 blackhole_log_msg = string_sprintf(": %s", log_msg);
3618 }
3619 else if (rc != OK)
3620 {
3621 Uunlink(spool_name);
3622 #ifdef WITH_CONTENT_SCAN
3623 unspool_mbox();
3624 #endif
3625 #ifdef EXPERIMENTAL_DCC
3626 dcc_ok = 0;
3627 #endif
3628 /* The ACL can specify where rejections are to be logged, possibly
3629 nowhere. The default is main and reject logs. */
3630
3631 if (log_reject_target != 0)
3632 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3633 sender_address, log_msg);
3634
3635 if (user_msg == NULL) user_msg = US"local configuration problem";
3636 if (smtp_batched_input)
3637 {
3638 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3639 /* Does not return */
3640 }
3641 else
3642 {
3643 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3644 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3645 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3646 header_list);
3647 /* Does not return */
3648 }
3649 }
3650 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3651 }
3652 }
3653
3654 /* The applicable ACLs have been run */
3655
3656 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3657 if (queue_only_policy) queued_by = US"ACL";
3658 }
3659
3660 #ifdef WITH_CONTENT_SCAN
3661 unspool_mbox();
3662 #endif
3663
3664 #ifdef EXPERIMENTAL_DCC
3665 dcc_ok = 0;
3666 #endif
3667
3668
3669 /* The final check on the message is to run the scan_local() function. The
3670 version supplied with Exim always accepts, but this is a hook for sysadmins to
3671 supply their own checking code. The local_scan() function is run even when all
3672 the recipients have been discarded. */
3673 /*XXS could we avoid this for the standard case, given that few people will use it? */
3674
3675 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3676
3677 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3678 deleted, and the incident gets logged. */
3679
3680 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3681 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3682 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3683 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3684
3685 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3686 local_scan_timeout);
3687 local_scan_data = NULL;
3688
3689 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3690 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3691 rc = local_scan(data_fd, &local_scan_data);
3692 alarm(0);
3693 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3694
3695 enable_dollar_recipients = FALSE;
3696
3697 store_pool = POOL_MAIN; /* In case changed */
3698 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3699 local_scan_data);
3700
3701 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3702 os_non_restarting_signal(SIGFPE, SIG_DFL);
3703 os_non_restarting_signal(SIGILL, SIG_DFL);
3704 os_non_restarting_signal(SIGBUS, SIG_DFL);
3705
3706 /* The length check is paranoia against some runaway code, and also because
3707 (for a success return) lines in the spool file are read into big_buffer. */
3708
3709 if (local_scan_data != NULL)
3710 {
3711 int len = Ustrlen(local_scan_data);
3712 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3713 local_scan_data = string_copyn(local_scan_data, len);
3714 }
3715
3716 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3717 {
3718 if (!deliver_freeze) /* ACL might have already frozen */
3719 {
3720 deliver_freeze = TRUE;
3721 deliver_frozen_at = time(NULL);
3722 frozen_by = US"local_scan()";
3723 }
3724 rc = LOCAL_SCAN_ACCEPT;
3725 }
3726 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3727 {
3728 if (!queue_only_policy) /* ACL might have already queued */
3729 {
3730 queue_only_policy = TRUE;
3731 queued_by = US"local_scan()";
3732 }
3733 rc = LOCAL_SCAN_ACCEPT;
3734 }
3735
3736 /* Message accepted: remove newlines in local_scan_data because otherwise
3737 the spool file gets corrupted. Ensure that all recipients are qualified. */
3738
3739 if (rc == LOCAL_SCAN_ACCEPT)
3740 {
3741 if (local_scan_data != NULL)
3742 {
3743 uschar *s;
3744 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3745 }
3746 for (i = 0; i < recipients_count; i++)
3747 {
3748 recipient_item *r = recipients_list + i;
3749 r->address = rewrite_address_qualify(r->address, TRUE);
3750 if (r->errors_to != NULL)
3751 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3752 }
3753 if (recipients_count == 0 && blackholed_by == NULL)
3754 blackholed_by = US"local_scan";
3755 }
3756
3757 /* Message rejected: newlines permitted in local_scan_data to generate
3758 multiline SMTP responses. */
3759
3760 else
3761 {
3762 uschar *istemp = US"";
3763 uschar *smtp_code;
3764 gstring * g;
3765
3766 errmsg = local_scan_data;
3767
3768 Uunlink(spool_name); /* Cancel this message */
3769 switch(rc)
3770 {
3771 default:
3772 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3773 "rejection given", rc);
3774 goto TEMPREJECT;
3775
3776 case LOCAL_SCAN_REJECT_NOLOGHDR:
3777 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3778 /* Fall through */
3779
3780 case LOCAL_SCAN_REJECT:
3781 smtp_code = US"550";
3782 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3783 break;
3784
3785 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3786 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3787 /* Fall through */
3788
3789 case LOCAL_SCAN_TEMPREJECT:
3790 TEMPREJECT:
3791 smtp_code = US"451";
3792 if (errmsg == NULL) errmsg = US"Temporary local problem";
3793 istemp = US"temporarily ";
3794 break;
3795 }
3796
3797 g = string_append(g, 2, US"F=",
3798 sender_address[0] == 0 ? US"<>" : sender_address);
3799 g = add_host_info_for_log(g);
3800
3801 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3802 string_from_gstring(g), istemp, string_printing(errmsg));
3803
3804 if (smtp_input)
3805 {
3806 if (!smtp_batched_input)
3807 {
3808 smtp_respond(smtp_code, 3, TRUE, errmsg);
3809 message_id[0] = 0; /* Indicate no message accepted */
3810 smtp_reply = US""; /* Indicate reply already sent */
3811 goto TIDYUP; /* Skip to end of function */
3812 }
3813 else
3814 {
3815 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3816 /* Does not return */
3817 }
3818 }
3819 else
3820 {
3821 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3822 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3823 US"message rejected by local scan code: ", error_rc, data_file,
3824 header_list);
3825 /* Does not return */
3826 }
3827 }
3828
3829 /* Reset signal handlers to ignore signals that previously would have caused
3830 the message to be abandoned. */
3831
3832 signal(SIGTERM, SIG_IGN);
3833 signal(SIGINT, SIG_IGN);
3834
3835
3836 /* Ensure the first time flag is set in the newly-received message. */
3837
3838 deliver_firsttime = TRUE;
3839
3840 #ifdef EXPERIMENTAL_BRIGHTMAIL
3841 if (bmi_run == 1)
3842 { /* rewind data file */
3843 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3844 bmi_verdicts = bmi_process_message(header_list, data_fd);
3845 }
3846 #endif
3847
3848 /* Update the timestamp in our Received: header to account for any time taken by
3849 an ACL or by local_scan(). The new time is the time that all reception
3850 processing is complete. */
3851
3852 timestamp = expand_string(US"${tod_full}");
3853 tslen = Ustrlen(timestamp);
3854
3855 memcpy(received_header->text + received_header->slen - tslen - 1,
3856 timestamp, tslen);
3857
3858 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3859
3860 if (mua_wrapper)
3861 {
3862 deliver_freeze = FALSE;
3863 queue_only_policy = FALSE;
3864 }
3865
3866 /* Keep the data file open until we have written the header file, in order to
3867 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3868 don't write the header file, and we unlink the data file. If writing the header
3869 file fails, we have failed to accept this message. */
3870
3871 if (host_checking || blackholed_by != NULL)
3872 {
3873 header_line *h;
3874 Uunlink(spool_name);
3875 msg_size = 0; /* Compute size for log line */
3876 for (h = header_list; h != NULL; h = h->next)
3877 if (h->type != '*') msg_size += h->slen;
3878 }
3879
3880 /* Write the -H file */
3881
3882 else
3883 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3884 {
3885 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3886 Uunlink(spool_name); /* Lose the data file */
3887
3888 if (smtp_input)
3889 {
3890 smtp_reply = US"451 Error in writing spool file";
3891 message_id[0] = 0; /* Indicate no message accepted */
3892 goto TIDYUP;
3893 }
3894 else
3895 {
3896 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3897 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3898 header_list);
3899 /* Does not return */
3900 }
3901 }
3902
3903
3904 /* The message has now been successfully received. */
3905
3906 receive_messagecount++;
3907
3908 /* In SMTP sessions we may receive several in one connection. After each one,
3909 we wait for the clock to tick at the level of message-id granularity. This is
3910 so that the combination of time+pid is unique, even on systems where the pid
3911 can be re-used within our time interval. We can't shorten the interval without
3912 re-designing the message-id. See comments above where the message id is
3913 created. This is Something For The Future. */
3914
3915 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3916 exim_wait_tick(&message_id_tv, id_resolution);
3917
3918 /* Add data size to written header size. We do not count the initial file name
3919 that is in the file, but we do add one extra for the notional blank line that
3920 precedes the data. This total differs from message_size in that it include the
3921 added Received: header and any other headers that got created locally. */
3922
3923 fflush(data_file);
3924 fstat(data_fd, &statbuf);
3925
3926 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3927
3928 /* Generate a "message received" log entry. We do this by building up a dynamic
3929 string as required. Since we commonly want to add two items at a time, use a
3930 macro to simplify the coding. We log the arrival of a new message while the
3931 file is still locked, just in case the machine is *really* fast, and delivers
3932 it first! Include any message id that is in the message - since the syntax of a
3933 message id is actually an addr-spec, we can use the parse routine to canonicalize
3934 it. */
3935
3936 g = string_get(256);
3937
3938 g = string_append(g, 2,
3939 fake_response == FAIL ? US"(= " : US"<= ",
3940 sender_address[0] == 0 ? US"<>" : sender_address);
3941 if (message_reference)
3942 g = string_append(g, 2, US" R=", message_reference);
3943
3944 g = add_host_info_for_log(g);
3945
3946 #ifdef SUPPORT_TLS
3947 if (LOGGING(tls_cipher) && tls_in.cipher)
3948 g = string_append(g, 2, US" X=", tls_in.cipher);
3949 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3950 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3951 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3952 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3953 if (LOGGING(tls_sni) && tls_in.sni)
3954 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3955 #endif
3956
3957 if (sender_host_authenticated)
3958 {
3959 g = string_append(g, 2, US" A=", sender_host_authenticated);
3960 if (authenticated_id)
3961 {
3962 g = string_append(g, 2, US":", authenticated_id);
3963 if (LOGGING(smtp_mailauth) && authenticated_sender)
3964 g = string_append(g, 2, US":", authenticated_sender);
3965 }
3966 }
3967
3968 #ifndef DISABLE_PRDR
3969 if (prdr_requested)
3970 g = string_catn(g, US" PRDR", 5);
3971 #endif
3972
3973 #ifdef SUPPORT_PROXY
3974 if (proxy_session && LOGGING(proxy))
3975 g = string_append(g, 2, US" PRX=", proxy_local_address);
3976 #endif
3977
3978 if (chunking_state > CHUNKING_OFFERED)
3979 g = string_catn(g, US" K", 2);
3980
3981 sprintf(CS big_buffer, "%d", msg_size);
3982 g = string_append(g, 2, US" S=", big_buffer);
3983
3984 /* log 8BITMIME mode announced in MAIL_FROM
3985 0 ... no BODY= used
3986 7 ... 7BIT
3987 8 ... 8BITMIME */
3988 if (LOGGING(8bitmime))
3989 {
3990 sprintf(CS big_buffer, "%d", body_8bitmime);
3991 g = string_append(g, 2, US" M8S=", big_buffer);
3992 }
3993
3994 if (*queue_name)
3995 g = string_append(g, 2, US" Q=", queue_name);
3996
3997 /* If an addr-spec in a message-id contains a quoted string, it can contain
3998 any characters except " \ and CR and so in particular it can contain NL!
3999 Therefore, make sure we use a printing-characters only version for the log.
4000 Also, allow for domain literals in the message id. */
4001
4002 if (msgid_header)
4003 {
4004 uschar *old_id;
4005 BOOL save_allow_domain_literals = allow_domain_literals;
4006 allow_domain_literals = TRUE;
4007 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4008 &errmsg, &start, &end, &domain, FALSE);
4009 allow_domain_literals = save_allow_domain_literals;
4010 if (old_id != NULL)
4011 g = string_append(g, 2, US" id=", string_printing(old_id));
4012 }
4013
4014 /* If subject logging is turned on, create suitable printing-character
4015 text. By expanding $h_subject: we make use of the MIME decoding. */
4016
4017 if (LOGGING(subject) && subject_header != NULL)
4018 {
4019 int i;
4020 uschar *p = big_buffer;
4021 uschar *ss = expand_string(US"$h_subject:");
4022
4023 /* Backslash-quote any double quotes or backslashes so as to make a
4024 a C-like string, and turn any non-printers into escape sequences. */
4025
4026 *p++ = '\"';
4027 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4028 {
4029 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4030 *p++ = ss[i];
4031 }
4032 *p++ = '\"';
4033 *p = 0;
4034 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4035 }
4036
4037 /* Terminate the string: string_cat() and string_append() leave room, but do
4038 not put the zero in. */
4039
4040 (void) string_from_gstring(g);
4041
4042 /* Create a message log file if message logs are being used and this message is
4043 not blackholed. Write the reception stuff to it. We used to leave message log
4044 creation until the first delivery, but this has proved confusing for some
4045 people. */
4046
4047 if (message_logs && !blackholed_by)
4048 {
4049 int fd;
4050
4051 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4052
4053 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4054 && errno == ENOENT
4055 )
4056 {
4057 (void)directory_make(spool_directory,
4058 spool_sname(US"msglog", message_subdir),
4059 MSGLOG_DIRECTORY_MODE, TRUE);
4060 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4061 }
4062
4063 if (fd < 0)
4064 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4065 spool_name, strerror(errno));
4066 else
4067 {
4068 FILE *message_log = fdopen(fd, "a");
4069 if (message_log == NULL)
4070 {
4071 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4072 spool_name, strerror(errno));
4073 (void)close(fd);
4074 }
4075 else