73713aa97f020f8c06ad39fed79be6004694ce17
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
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
29
30 /*************************************************
31 * Non-SMTP character reading functions *
32 *************************************************/
33
34 /* These are the default functions that are set up in the variables such as
35 receive_getc initially. They just call the standard functions, passing stdin as
36 the file. (When SMTP input is occurring, different functions are used by
37 changing the pointer variables.) */
38
39 int
40 stdin_getc(void)
41 {
42 return getc(stdin);
43 }
44
45 int
46 stdin_ungetc(int c)
47 {
48 return ungetc(c, stdin);
49 }
50
51 int
52 stdin_feof(void)
53 {
54 return feof(stdin);
55 }
56
57 int
58 stdin_ferror(void)
59 {
60 return ferror(stdin);
61 }
62
63
64
65
66 /*************************************************
67 * Check that a set sender is allowed *
68 *************************************************/
69
70 /* This function is called when a local caller sets an explicit sender address.
71 It checks whether this is permitted, which it is for trusted callers.
72 Otherwise, it must match the pattern(s) in untrusted_set_sender.
73
74 Arguments: the proposed sender address
75 Returns: TRUE for a trusted caller
76 TRUE if the address has been set, untrusted_set_sender has been
77 set, and the address matches something in the list
78 FALSE otherwise
79 */
80
81 BOOL
82 receive_check_set_sender(uschar *newsender)
83 {
84 uschar *qnewsender;
85 if (trusted_caller) return TRUE;
86 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
87 qnewsender = (Ustrchr(newsender, '@') != NULL)?
88 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
89 return
90 match_address_list(qnewsender, TRUE, TRUE, CUSS &untrusted_set_sender, NULL, -1,
91 0, NULL) == OK;
92 }
93
94
95
96
97 /*************************************************
98 * Read space info for a partition *
99 *************************************************/
100
101 /* This function is called by receive_check_fs() below, and also by string
102 expansion for variables such as $spool_space. The field names for the statvfs
103 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
104 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
105 have inodes, and they return -1 for the number available.
106
107 Later: It turns out that some file systems that do not have the concept of
108 inodes return 0 rather than -1. Such systems should also return 0 for the total
109 number of inodes, so we require that to be greater than zero before returning
110 an inode count.
111
112 Arguments:
113 isspool TRUE for spool partition, FALSE for log partition
114 inodeptr address of int to receive inode count; -1 if there isn't one
115
116 Returns: available on-root space, in kilobytes
117 -1 for log partition if there isn't one
118
119 All values are -1 if the STATFS functions are not available.
120 */
121
122 int
123 receive_statvfs(BOOL isspool, int *inodeptr)
124 {
125 #ifdef HAVE_STATFS
126 struct STATVFS statbuf;
127 struct stat dummy;
128 uschar *path;
129 uschar *name;
130 uschar buffer[1024];
131
132 /* The spool directory must always exist. */
133
134 if (isspool)
135 {
136 path = spool_directory;
137 name = US"spool";
138 }
139
140 /* Need to cut down the log file path to the directory, and to ignore any
141 appearance of "syslog" in it. */
142
143 else
144 {
145 int sep = ':'; /* Not variable - outside scripts use */
146 const uschar *p = log_file_path;
147 name = US"log";
148
149 /* An empty log_file_path means "use the default". This is the same as an
150 empty item in a list. */
151
152 if (*p == 0) p = US":";
153 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
154 if (Ustrcmp(path, "syslog") != 0)
155 break;
156
157 if (path == NULL) /* No log files */
158 {
159 *inodeptr = -1;
160 return -1;
161 }
162
163 /* An empty string means use the default, which is in the spool directory.
164 But don't just use the spool directory, as it is possible that the log
165 subdirectory has been symbolically linked elsewhere. */
166
167 if (path[0] == 0)
168 {
169 sprintf(CS buffer, CS"%s/log", CS spool_directory);
170 path = buffer;
171 }
172 else
173 {
174 uschar *cp;
175 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
176 }
177 }
178
179 /* We now have the path; do the business */
180
181 memset(&statbuf, 0, sizeof(statbuf));
182
183 if (STATVFS(CS path, &statbuf) != 0)
184 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
185 { /* Can happen on first run after installation */
186 *inodeptr = -1;
187 return -1;
188 }
189 else
190 {
191 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
192 "%s directory %s: %s", name, path, strerror(errno));
193 smtp_closedown(US"spool or log directory problem");
194 exim_exit(EXIT_FAILURE);
195 }
196
197 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
198
199 /* Disks are getting huge. Take care with computing the size in kilobytes. */
200
201 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
202
203 #else
204 /* Unable to find partition sizes in this environment. */
205
206 *inodeptr = -1;
207 return -1;
208 #endif
209 }
210
211
212
213
214 /*************************************************
215 * Check space on spool and log partitions *
216 *************************************************/
217
218 /* This function is called before accepting a message; if any thresholds are
219 set, it checks them. If a message_size is supplied, it checks that there is
220 enough space for that size plus the threshold - i.e. that the message won't
221 reduce the space to the threshold. Not all OS have statvfs(); for those that
222 don't, this function always returns TRUE. For some OS the old function and
223 struct name statfs is used; that is handled by a macro, defined in exim.h.
224
225 Arguments:
226 msg_size the (estimated) size of an incoming message
227
228 Returns: FALSE if there isn't enough space, or if the information cannot
229 be obtained
230 TRUE if no check was done or there is enough space
231 */
232
233 BOOL
234 receive_check_fs(int msg_size)
235 {
236 int space, inodes;
237
238 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
239 {
240 space = receive_statvfs(TRUE, &inodes);
241
242 DEBUG(D_receive)
243 debug_printf("spool directory space = %dK inodes = %d "
244 "check_space = %dK inodes = %d msg_size = %d\n",
245 space, inodes, check_spool_space, check_spool_inodes, msg_size);
246
247 if ((space >= 0 && space < check_spool_space) ||
248 (inodes >= 0 && inodes < check_spool_inodes))
249 {
250 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
251 "inodes=%d", space, inodes);
252 return FALSE;
253 }
254 }
255
256 if (check_log_space > 0 || check_log_inodes > 0)
257 {
258 space = receive_statvfs(FALSE, &inodes);
259
260 DEBUG(D_receive)
261 debug_printf("log directory space = %dK inodes = %d "
262 "check_space = %dK inodes = %d\n",
263 space, inodes, check_log_space, check_log_inodes);
264
265 if ((space >= 0 && space < check_log_space) ||
266 (inodes >= 0 && inodes < check_log_inodes))
267 {
268 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
269 "inodes=%d", space, inodes);
270 return FALSE;
271 }
272 }
273
274 return TRUE;
275 }
276
277
278
279 /*************************************************
280 * Bomb out while reading a message *
281 *************************************************/
282
283 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
284 received, or if there is a timeout. A rarer case might be if the log files are
285 screwed up and Exim can't open them to record a message's arrival. Handling
286 that case is done by setting a flag to cause the log functions to call this
287 function if there is an ultimate disaster. That is why it is globally
288 accessible.
289
290 Arguments:
291 reason text reason to pass to the not-quit ACL
292 msg default SMTP response to give if in an SMTP session
293 Returns: it doesn't
294 */
295
296 void
297 receive_bomb_out(uschar *reason, uschar *msg)
298 {
299 static BOOL already_bombing_out;
300 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
301 timeouts, if someone has something slow in their quit ACL. Since the only
302 things we should be doing are to close down cleanly ASAP, on the second
303 pass we also close down stuff that might be opened again, before bypassing
304 the ACL call and exiting. */
305
306 /* If spool_name is set, it contains the name of the data file that is being
307 written. Unlink it before closing so that it cannot be picked up by a delivery
308 process. Ensure that any header file is also removed. */
309
310 if (spool_name[0] != '\0')
311 {
312 Uunlink(spool_name);
313 spool_name[Ustrlen(spool_name) - 1] = 'H';
314 Uunlink(spool_name);
315 spool_name[0] = '\0';
316 }
317
318 /* Now close the file if it is open, either as a fd or a stream. */
319
320 if (data_file != NULL)
321 {
322 (void)fclose(data_file);
323 data_file = NULL;
324 } else if (data_fd >= 0) {
325 (void)close(data_fd);
326 data_fd = -1;
327 }
328
329 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
330 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
331 SMTP response. */
332
333 if (!already_bombing_out)
334 {
335 already_bombing_out = TRUE;
336 if (smtp_input)
337 {
338 if (smtp_batched_input)
339 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
340 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
341 smtp_active_hostname, msg);
342 }
343 }
344
345 /* Exit from the program (non-BSMTP cases) */
346
347 exim_exit(EXIT_FAILURE);
348 }
349
350
351 /*************************************************
352 * Data read timeout *
353 *************************************************/
354
355 /* Handler function for timeouts that occur while reading the data that
356 comprises a message.
357
358 Argument: the signal number
359 Returns: nothing
360 */
361
362 static void
363 data_timeout_handler(int sig)
364 {
365 uschar *msg = NULL;
366
367 sig = sig; /* Keep picky compilers happy */
368
369 if (smtp_input)
370 {
371 msg = US"SMTP incoming data timeout";
372 log_write(L_lost_incoming_connection,
373 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
374 "from %s F=<%s>",
375 (sender_fullhost != NULL)? sender_fullhost : US"local process",
376 sender_address);
377 }
378 else
379 {
380 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
381 log_write(L_lost_incoming_connection,
382 LOG_MAIN, "timed out while reading local message");
383 }
384
385 receive_bomb_out(US"data-timeout", msg); /* Does not return */
386 }
387
388
389
390 /*************************************************
391 * local_scan() timeout *
392 *************************************************/
393
394 /* Handler function for timeouts that occur while running a local_scan()
395 function.
396
397 Argument: the signal number
398 Returns: nothing
399 */
400
401 static void
402 local_scan_timeout_handler(int sig)
403 {
404 sig = sig; /* Keep picky compilers happy */
405 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
406 "message temporarily rejected (size %d)", message_size);
407 /* Does not return */
408 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
409 }
410
411
412
413 /*************************************************
414 * local_scan() crashed *
415 *************************************************/
416
417 /* Handler function for signals that occur while running a local_scan()
418 function.
419
420 Argument: the signal number
421 Returns: nothing
422 */
423
424 static void
425 local_scan_crash_handler(int sig)
426 {
427 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
428 "signal %d - message temporarily rejected (size %d)", sig, message_size);
429 /* Does not return */
430 receive_bomb_out(US"local-scan-error", US"local verification problem");
431 }
432
433
434 /*************************************************
435 * SIGTERM or SIGINT received *
436 *************************************************/
437
438 /* Handler for SIGTERM or SIGINT signals that occur while reading the
439 data that comprises a message.
440
441 Argument: the signal number
442 Returns: nothing
443 */
444
445 static void
446 data_sigterm_sigint_handler(int sig)
447 {
448 uschar *msg = NULL;
449
450 if (smtp_input)
451 {
452 msg = US"Service not available - SIGTERM or SIGINT received";
453 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
454 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
455 }
456 else
457 {
458 if (filter_test == FTEST_NONE)
459 {
460 fprintf(stderr, "\nexim: %s received - message abandoned\n",
461 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
462 log_write(0, LOG_MAIN, "%s received while reading local message",
463 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
464 }
465 }
466
467 receive_bomb_out(US"signal-exit", msg); /* Does not return */
468 }
469
470
471
472 /*************************************************
473 * Add new recipient to list *
474 *************************************************/
475
476 /* This function builds a list of recipient addresses in argc/argv
477 format.
478
479 Arguments:
480 recipient the next address to add to recipients_list
481 pno parent number for fixed aliases; -1 otherwise
482
483 Returns: nothing
484 */
485
486 void
487 receive_add_recipient(uschar *recipient, int pno)
488 {
489 if (recipients_count >= recipients_list_max)
490 {
491 recipient_item *oldlist = recipients_list;
492 int oldmax = recipients_list_max;
493 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
494 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
495 if (oldlist != NULL)
496 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
497 }
498
499 recipients_list[recipients_count].address = recipient;
500 recipients_list[recipients_count].pno = pno;
501 #ifdef EXPERIMENTAL_BRIGHTMAIL
502 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
503 /* reset optin string pointer for next recipient */
504 bmi_current_optin = NULL;
505 #endif
506 recipients_list[recipients_count].orcpt = NULL;
507 recipients_list[recipients_count].dsn_flags = 0;
508 recipients_list[recipients_count++].errors_to = NULL;
509 }
510
511
512
513
514 /*************************************************
515 * Send user response message *
516 *************************************************/
517
518 /* This function is passed a default response code and a user message. It calls
519 smtp_message_code() to check and possibly modify the response code, and then
520 calls smtp_respond() to transmit the response. I put this into a function
521 just to avoid a lot of repetition.
522
523 Arguments:
524 code the response code
525 user_msg the user message
526
527 Returns: nothing
528 */
529
530 #ifndef DISABLE_PRDR
531 static void
532 smtp_user_msg(uschar *code, uschar *user_msg)
533 {
534 int len = 3;
535 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
536 smtp_respond(code, len, TRUE, user_msg);
537 }
538 #endif
539
540
541
542
543
544 /*************************************************
545 * Remove a recipient from the list *
546 *************************************************/
547
548 /* This function is provided for local_scan() to use.
549
550 Argument:
551 recipient address to remove
552
553 Returns: TRUE if it did remove something; FALSE otherwise
554 */
555
556 BOOL
557 receive_remove_recipient(uschar *recipient)
558 {
559 int count;
560 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
561 recipient);
562 for (count = 0; count < recipients_count; count++)
563 {
564 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
565 {
566 if ((--recipients_count - count) > 0)
567 memmove(recipients_list + count, recipients_list + count + 1,
568 (recipients_count - count)*sizeof(recipient_item));
569 return TRUE;
570 }
571 }
572 return FALSE;
573 }
574
575
576
577
578
579 /*************************************************
580 * Read data portion of a non-SMTP message *
581 *************************************************/
582
583 /* This function is called to read the remainder of a message (following the
584 header) when the input is not from SMTP - we are receiving a local message on
585 a standard input stream. The message is always terminated by EOF, and is also
586 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
587 two cases for maximum efficiency.
588
589 Ensure that the body ends with a newline. This will naturally be the case when
590 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
591 as "sequences of lines" - this of course strictly applies only to SMTP, but
592 deliveries into BSD-type mailbox files also require it. Exim used to have a
593 flag for doing this at delivery time, but as it was always set for all
594 transports, I decided to simplify things by putting the check here instead.
595
596 There is at least one MUA (dtmail) that sends CRLF via this interface, and
597 other programs are known to do this as well. Exim used to have a option for
598 dealing with this: in July 2003, after much discussion, the code has been
599 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
600
601 However, for the case when a dot on a line by itself terminates a message, the
602 only recognized terminating sequences before and after the dot are LF and CRLF.
603 Otherwise, having read EOL . CR, you don't know whether to read another
604 character or not.
605
606 Internally, in messages stored in Exim's spool files, LF is used as the line
607 terminator. Under the new regime, bare CRs will no longer appear in these
608 files.
609
610 Arguments:
611 fout a FILE to which to write the message
612
613 Returns: One of the END_xxx values indicating why it stopped reading
614 */
615
616 static int
617 read_message_data(FILE *fout)
618 {
619 int ch_state;
620 register int ch;
621 register int linelength = 0;
622
623 /* Handle the case when only EOF terminates the message */
624
625 if (!dot_ends)
626 {
627 register int last_ch = '\n';
628
629 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
630 {
631 if (ch == 0) body_zerocount++;
632 if (last_ch == '\r' && ch != '\n')
633 {
634 if (linelength > max_received_linelength)
635 max_received_linelength = linelength;
636 linelength = 0;
637 if (fputc('\n', fout) == EOF) return END_WERROR;
638 message_size++;
639 body_linecount++;
640 }
641 if (ch == '\r') continue;
642
643 if (fputc(ch, fout) == EOF) return END_WERROR;
644 if (ch == '\n')
645 {
646 if (linelength > max_received_linelength)
647 max_received_linelength = linelength;
648 linelength = 0;
649 body_linecount++;
650 }
651 else linelength++;
652 if (++message_size > thismessage_size_limit) return END_SIZE;
653 }
654
655 if (last_ch != '\n')
656 {
657 if (linelength > max_received_linelength)
658 max_received_linelength = linelength;
659 if (fputc('\n', fout) == EOF) return END_WERROR;
660 message_size++;
661 body_linecount++;
662 }
663
664 return END_EOF;
665 }
666
667 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
668
669 ch_state = 1;
670
671 while ((ch = (receive_getc)()) != EOF)
672 {
673 if (ch == 0) body_zerocount++;
674 switch (ch_state)
675 {
676 case 0: /* Normal state (previous char written) */
677 if (ch == '\n')
678 {
679 body_linecount++;
680 if (linelength > max_received_linelength)
681 max_received_linelength = linelength;
682 linelength = -1;
683 ch_state = 1;
684 }
685 else if (ch == '\r')
686 { ch_state = 2; continue; }
687 break;
688
689 case 1: /* After written "\n" */
690 if (ch == '.') { ch_state = 3; continue; }
691 if (ch == '\r') { ch_state = 2; continue; }
692 if (ch == '\n') { body_linecount++; linelength = -1; }
693 else ch_state = 0;
694 break;
695
696 case 2:
697 body_linecount++; /* After unwritten "\r" */
698 if (linelength > max_received_linelength)
699 max_received_linelength = linelength;
700 if (ch == '\n')
701 {
702 ch_state = 1;
703 linelength = -1;
704 }
705 else
706 {
707 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
708 if (ch == '\r') continue;
709 ch_state = 0;
710 linelength = 0;
711 }
712 break;
713
714 case 3: /* After "\n." (\n written, dot not) */
715 if (ch == '\n') return END_DOT;
716 if (ch == '\r') { ch_state = 4; continue; }
717 message_size++;
718 linelength++;
719 if (fputc('.', fout) == EOF) return END_WERROR;
720 ch_state = 0;
721 break;
722
723 case 4: /* After "\n.\r" (\n written, rest not) */
724 if (ch == '\n') return END_DOT;
725 message_size += 2;
726 body_linecount++;
727 if (fputs(".\n", fout) == EOF) return END_WERROR;
728 if (ch == '\r') { ch_state = 2; continue; }
729 ch_state = 0;
730 break;
731 }
732
733 linelength++;
734 if (fputc(ch, fout) == EOF) return END_WERROR;
735 if (++message_size > thismessage_size_limit) return END_SIZE;
736 }
737
738 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
739 the message ends with a newline, and we must also write any characters that
740 were saved up while testing for an ending dot. */
741
742 if (ch_state != 1)
743 {
744 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
745 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
746 message_size += Ustrlen(ends[ch_state]);
747 body_linecount++;
748 }
749
750 return END_EOF;
751 }
752
753
754
755
756 /*************************************************
757 * Read data portion of an SMTP message *
758 *************************************************/
759
760 /* This function is called to read the remainder of an SMTP message (after the
761 headers), or to skip over it when an error has occurred. In this case, the
762 output file is passed as NULL.
763
764 If any line begins with a dot, that character is skipped. The input should only
765 be successfully terminated by CR LF . CR LF unless it is local (non-network)
766 SMTP, in which case the CRs are optional, but...
767
768 FUDGE: It seems that sites on the net send out messages with just LF
769 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
770 we make the CRs optional in all cases.
771
772 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
773 well, so that there are no CRs in spooled messages. However, the message
774 terminating dot is not recognized between two bare CRs.
775
776 Arguments:
777 fout a FILE to which to write the message; NULL if skipping
778
779 Returns: One of the END_xxx values indicating why it stopped reading
780 */
781
782 static int
783 read_message_data_smtp(FILE *fout)
784 {
785 int ch_state = 0;
786 int ch;
787 int linelength = 0;
788
789 while ((ch = (receive_getc)()) != EOF)
790 {
791 if (ch == 0) body_zerocount++;
792 switch (ch_state)
793 {
794 case 0: /* After LF or CRLF */
795 if (ch == '.')
796 {
797 ch_state = 3;
798 continue; /* Don't ever write . after LF */
799 }
800 ch_state = 1;
801
802 /* Else fall through to handle as normal uschar. */
803
804 case 1: /* Normal state */
805 if (ch == '\n')
806 {
807 ch_state = 0;
808 body_linecount++;
809 if (linelength > max_received_linelength)
810 max_received_linelength = linelength;
811 linelength = -1;
812 }
813 else if (ch == '\r')
814 {
815 ch_state = 2;
816 continue;
817 }
818 break;
819
820 case 2: /* After (unwritten) CR */
821 body_linecount++;
822 if (linelength > max_received_linelength)
823 max_received_linelength = linelength;
824 linelength = -1;
825 if (ch == '\n')
826 {
827 ch_state = 0;
828 }
829 else
830 {
831 message_size++;
832 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
833 (void) cutthrough_put_nl();
834 if (ch != '\r') ch_state = 1; else continue;
835 }
836 break;
837
838 case 3: /* After [CR] LF . */
839 if (ch == '\n')
840 return END_DOT;
841 if (ch == '\r')
842 {
843 ch_state = 4;
844 continue;
845 }
846 /* The dot was removed at state 3. For a doubled dot, here, reinstate
847 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
848 and to file below. */
849 if (ch == '.')
850 {
851 uschar c= ch;
852 (void) cutthrough_puts(&c, 1);
853 }
854 ch_state = 1;
855 break;
856
857 case 4: /* After [CR] LF . CR */
858 if (ch == '\n') return END_DOT;
859 message_size++;
860 body_linecount++;
861 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
862 (void) cutthrough_put_nl();
863 if (ch == '\r')
864 {
865 ch_state = 2;
866 continue;
867 }
868 ch_state = 1;
869 break;
870 }
871
872 /* Add the character to the spool file, unless skipping; then loop for the
873 next. */
874
875 message_size++;
876 linelength++;
877 if (fout)
878 {
879 if (fputc(ch, fout) == EOF) return END_WERROR;
880 if (message_size > thismessage_size_limit) return END_SIZE;
881 }
882 if(ch == '\n')
883 (void) cutthrough_put_nl();
884 else
885 {
886 uschar c = ch;
887 (void) cutthrough_puts(&c, 1);
888 }
889 }
890
891 /* Fall through here if EOF encountered. This indicates some kind of error,
892 since a correct message is terminated by [CR] LF . [CR] LF. */
893
894 return END_EOF;
895 }
896
897
898
899
900 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
901 CHUNKING. We assume that the incoming has proper CRLF, so only have to scan
902 for and strip CR. On the downside there are more protocol reasons to stop.
903
904 Arguments:
905 fout a FILE to which to write the message; NULL if skipping
906
907 Returns: One of the END_xxx values indicating why it stopped reading
908 */
909
910 static int
911 read_message_bdat_smtp(FILE *fout)
912 {
913 int ch;
914 int linelength = 0;
915
916 for (;;) switch (ch = bdat_getc())
917 {
918 case EOF: return END_EOF;
919 case EOD: return END_DOT;
920 case ERR: return END_PROTOCOL;
921
922 case '\r':
923 body_linecount++;
924 if (linelength > max_received_linelength)
925 max_received_linelength = linelength;
926 linelength = -1;
927 break;
928
929 case 0:
930 body_zerocount++;
931 /*FALLTHROUGH*/
932 default:
933 message_size++;
934 linelength++;
935 if (fout)
936 {
937 if (fputc(ch, fout) == EOF) return END_WERROR;
938 if (message_size > thismessage_size_limit) return END_SIZE;
939 }
940 #ifdef notyet
941 if(ch == '\n')
942 (void) cutthrough_put_nl();
943 else
944 {
945 uschar c = ch;
946 (void) cutthrough_puts(&c, 1);
947 }
948 #endif
949 break;
950 }
951 /*NOTREACHED*/
952 }
953
954
955
956
957 /*************************************************
958 * Swallow SMTP message *
959 *************************************************/
960
961 /* This function is called when there has been some kind of error while reading
962 an SMTP message, and the remaining data may need to be swallowed. It is global
963 because it is called from smtp_closedown() to shut down an incoming call
964 tidily.
965
966 Argument: a FILE from which to read the message
967 Returns: nothing
968 */
969
970 void
971 receive_swallow_smtp(void)
972 {
973 /*XXX CHUNKING: not enough. read chunks until RSET? */
974 if (message_ended >= END_NOTENDED)
975 message_ended = read_message_data_smtp(NULL);
976 }
977
978
979
980 /*************************************************
981 * Handle lost SMTP connection *
982 *************************************************/
983
984 /* This function logs connection loss incidents and generates an appropriate
985 SMTP response.
986
987 Argument: additional data for the message
988 Returns: the SMTP response
989 */
990
991 static uschar *
992 handle_lost_connection(uschar *s)
993 {
994 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
995 "%s lost while reading message data%s", smtp_get_connection_info(), s);
996 smtp_notquit_exit(US"connection-lost", NULL, NULL);
997 return US"421 Lost incoming connection";
998 }
999
1000
1001
1002
1003 /*************************************************
1004 * Handle a non-smtp reception error *
1005 *************************************************/
1006
1007 /* This function is called for various errors during the reception of non-SMTP
1008 messages. It either sends a message to the sender of the problem message, or it
1009 writes to the standard error stream.
1010
1011 Arguments:
1012 errcode code for moan_to_sender(), identifying the error
1013 text1 first message text, passed to moan_to_sender()
1014 text2 second message text, used only for stderrr
1015 error_rc code to pass to exim_exit if no problem
1016 f FILE containing body of message (may be stdin)
1017 hptr pointer to instore headers or NULL
1018
1019 Returns: calls exim_exit(), which does not return
1020 */
1021
1022 static void
1023 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1024 FILE *f, header_line *hptr)
1025 {
1026 if (error_handling == ERRORS_SENDER)
1027 {
1028 error_block eblock;
1029 eblock.next = NULL;
1030 eblock.text1 = text1;
1031 eblock.text2 = US"";
1032 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1033 error_rc = EXIT_FAILURE;
1034 }
1035 else
1036 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1037 (void)fclose(f);
1038 exim_exit(error_rc);
1039 }
1040
1041
1042
1043 /*************************************************
1044 * Add header lines set up by ACL *
1045 *************************************************/
1046
1047 /* This function is called to add the header lines that were set up by
1048 statements in an ACL to the list of headers in memory. It is done in two stages
1049 like this, because when the ACL for RCPT is running, the other headers have not
1050 yet been received. This function is called twice; once just before running the
1051 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1052 are visible to the DATA ACL.
1053
1054 Originally these header lines were added at the end. Now there is support for
1055 three different places: top, bottom, and after the Received: header(s). There
1056 will always be at least one Received: header, even if it is marked deleted, and
1057 even if something else has been put in front of it.
1058
1059 Arguments:
1060 acl_name text to identify which ACL
1061
1062 Returns: nothing
1063 */
1064
1065 static void
1066 add_acl_headers(int where, uschar *acl_name)
1067 {
1068 header_line *h, *next;
1069 header_line *last_received = NULL;
1070
1071 switch(where)
1072 {
1073 case ACL_WHERE_DKIM:
1074 case ACL_WHERE_MIME:
1075 case ACL_WHERE_DATA:
1076 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1077 {
1078 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1079 " will not take effect on cutthrough deliveries");
1080 return;
1081 }
1082 }
1083
1084 if (acl_removed_headers != NULL)
1085 {
1086 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1087
1088 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1089 {
1090 const uschar * list = acl_removed_headers;
1091 int sep = ':'; /* This is specified as a colon-separated list */
1092 uschar *s;
1093 uschar buffer[128];
1094
1095 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1096 if (header_testname(h, s, Ustrlen(s), FALSE))
1097 {
1098 h->type = htype_old;
1099 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1100 }
1101 }
1102 acl_removed_headers = NULL;
1103 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1104 }
1105
1106 if (acl_added_headers == NULL) return;
1107 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1108
1109 for (h = acl_added_headers; h != NULL; h = next)
1110 {
1111 next = h->next;
1112
1113 switch(h->type)
1114 {
1115 case htype_add_top:
1116 h->next = header_list;
1117 header_list = h;
1118 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1119 break;
1120
1121 case htype_add_rec:
1122 if (last_received == NULL)
1123 {
1124 last_received = header_list;
1125 while (!header_testname(last_received, US"Received", 8, FALSE))
1126 last_received = last_received->next;
1127 while (last_received->next != NULL &&
1128 header_testname(last_received->next, US"Received", 8, FALSE))
1129 last_received = last_received->next;
1130 }
1131 h->next = last_received->next;
1132 last_received->next = h;
1133 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1134 break;
1135
1136 case htype_add_rfc:
1137 /* add header before any header which is NOT Received: or Resent- */
1138 last_received = header_list;
1139 while ( (last_received->next != NULL) &&
1140 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1141 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1142 last_received = last_received->next;
1143 /* last_received now points to the last Received: or Resent-* header
1144 in an uninterrupted chain of those header types (seen from the beginning
1145 of all headers. Our current header must follow it. */
1146 h->next = last_received->next;
1147 last_received->next = h;
1148 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1149 break;
1150
1151 default:
1152 h->next = NULL;
1153 header_last->next = h;
1154 break;
1155 }
1156
1157 if (h->next == NULL) header_last = h;
1158
1159 /* Check for one of the known header types (From:, To:, etc.) though in
1160 practice most added headers are going to be "other". Lower case
1161 identification letters are never stored with the header; they are used
1162 for existence tests when messages are received. So discard any lower case
1163 flag values. */
1164
1165 h->type = header_checkname(h, FALSE);
1166 if (h->type >= 'a') h->type = htype_other;
1167
1168 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1169 }
1170
1171 acl_added_headers = NULL;
1172 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1173 }
1174
1175
1176
1177 /*************************************************
1178 * Add host information for log line *
1179 *************************************************/
1180
1181 /* Called for acceptance and rejecting log lines. This adds information about
1182 the calling host to a string that is being built dynamically.
1183
1184 Arguments:
1185 s the dynamic string
1186 sizeptr points to the size variable
1187 ptrptr points to the pointer variable
1188
1189 Returns: the extended string
1190 */
1191
1192 static uschar *
1193 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1194 {
1195 if (sender_fullhost)
1196 {
1197 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1198 s = string_cat(s, sizeptr, ptrptr, US" DS");
1199 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1200 if (LOGGING(incoming_interface) && interface_address != NULL)
1201 {
1202 s = string_cat(s, sizeptr, ptrptr,
1203 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1204 }
1205 }
1206 if (sender_ident != NULL)
1207 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1208 if (received_protocol != NULL)
1209 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1210 return s;
1211 }
1212
1213
1214
1215 #ifdef WITH_CONTENT_SCAN
1216
1217 /*************************************************
1218 * Run the MIME ACL on a message *
1219 *************************************************/
1220
1221 /* This code is in a subroutine so that it can be used for both SMTP
1222 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1223
1224 Arguments:
1225 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1226 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1227 smtp_reply_ptr Where SMTP reply is being built
1228 blackholed_by_ptr Where "blackholed by" message is being built
1229
1230 Returns: TRUE to carry on; FALSE to abandon the message
1231 */
1232
1233 static BOOL
1234 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1235 uschar **blackholed_by_ptr)
1236 {
1237 FILE *mbox_file;
1238 uschar rfc822_file_path[2048];
1239 unsigned long mbox_size;
1240 header_line *my_headerlist;
1241 uschar *user_msg, *log_msg;
1242 int mime_part_count_buffer = -1;
1243 int rc = OK;
1244
1245 memset(CS rfc822_file_path,0,2048);
1246
1247 /* check if it is a MIME message */
1248 my_headerlist = header_list;
1249 while (my_headerlist != NULL)
1250 {
1251 /* skip deleted headers */
1252 if (my_headerlist->type == '*')
1253 {
1254 my_headerlist = my_headerlist->next;
1255 continue;
1256 }
1257 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1258 {
1259 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1260 goto DO_MIME_ACL;
1261 }
1262 my_headerlist = my_headerlist->next;
1263 }
1264
1265 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1266 return TRUE;
1267
1268 DO_MIME_ACL:
1269 /* make sure the eml mbox file is spooled up */
1270 mbox_file = spool_mbox(&mbox_size, NULL);
1271 if (mbox_file == NULL) {
1272 /* error while spooling */
1273 log_write(0, LOG_MAIN|LOG_PANIC,
1274 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1275 Uunlink(spool_name);
1276 unspool_mbox();
1277 #ifdef EXPERIMENTAL_DCC
1278 dcc_ok = 0;
1279 #endif
1280 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1281 message_id[0] = 0; /* Indicate no message accepted */
1282 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1283 return FALSE; /* Indicate skip to end of receive function */
1284 };
1285
1286 mime_is_rfc822 = 0;
1287
1288 MIME_ACL_CHECK:
1289 mime_part_count = -1;
1290 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1291 (void)fclose(mbox_file);
1292
1293 if (Ustrlen(rfc822_file_path) > 0)
1294 {
1295 mime_part_count = mime_part_count_buffer;
1296
1297 if (unlink(CS rfc822_file_path) == -1)
1298 {
1299 log_write(0, LOG_PANIC,
1300 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1301 goto END_MIME_ACL;
1302 }
1303 }
1304
1305 /* check if we must check any message/rfc822 attachments */
1306 if (rc == OK)
1307 {
1308 uschar temp_path[1024];
1309 struct dirent * entry;
1310 DIR * tempdir;
1311
1312 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1313 spool_directory, message_id);
1314
1315 tempdir = opendir(CS temp_path);
1316 for (;;)
1317 {
1318 if (!(entry = readdir(tempdir)))
1319 break;
1320 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1321 {
1322 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1323 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1324 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1325 rfc822_file_path);
1326 break;
1327 }
1328 }
1329 closedir(tempdir);
1330
1331 if (entry)
1332 {
1333 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1334 {
1335 /* set RFC822 expansion variable */
1336 mime_is_rfc822 = 1;
1337 mime_part_count_buffer = mime_part_count;
1338 goto MIME_ACL_CHECK;
1339 }
1340 log_write(0, LOG_PANIC,
1341 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1342 unlink(CS rfc822_file_path);
1343 }
1344 }
1345
1346 END_MIME_ACL:
1347 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1348 if (rc == DISCARD)
1349 {
1350 recipients_count = 0;
1351 *blackholed_by_ptr = US"MIME ACL";
1352 }
1353 else if (rc != OK)
1354 {
1355 Uunlink(spool_name);
1356 unspool_mbox();
1357 #ifdef EXPERIMENTAL_DCC
1358 dcc_ok = 0;
1359 #endif
1360 if ( smtp_input
1361 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1362 {
1363 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1364 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1365 }
1366 message_id[0] = 0; /* Indicate no message accepted */
1367 return FALSE; /* Cause skip to end of receive function */
1368 }
1369
1370 return TRUE;
1371 }
1372
1373 #endif /* WITH_CONTENT_SCAN */
1374
1375
1376
1377 void
1378 received_header_gen(void)
1379 {
1380 uschar *received;
1381 uschar *timestamp;
1382 header_line *received_header= header_list;
1383
1384 timestamp = expand_string(US"${tod_full}");
1385 if (recipients_count == 1) received_for = recipients_list[0].address;
1386 received = expand_string(received_header_text);
1387 received_for = NULL;
1388
1389 if (!received)
1390 {
1391 if(spool_name[0] != 0)
1392 Uunlink(spool_name); /* Lose the data file */
1393 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1394 "(received_header_text) failed: %s", string_printing(received_header_text),
1395 expand_string_message);
1396 }
1397
1398 /* The first element on the header chain is reserved for the Received header,
1399 so all we have to do is fill in the text pointer, and set the type. However, if
1400 the result of the expansion is an empty string, we leave the header marked as
1401 "old" so as to refrain from adding a Received header. */
1402
1403 if (received[0] == 0)
1404 {
1405 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1406 received_header->type = htype_old;
1407 }
1408 else
1409 {
1410 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1411 received_header->type = htype_received;
1412 }
1413
1414 received_header->slen = Ustrlen(received_header->text);
1415
1416 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1417 received_header->type, received_header->text);
1418 }
1419
1420
1421
1422 /*************************************************
1423 * Receive message *
1424 *************************************************/
1425
1426 /* Receive a message on the given input, and put it into a pair of spool files.
1427 Either a non-null list of recipients, or the extract flag will be true, or
1428 both. The flag sender_local is true for locally generated messages. The flag
1429 submission_mode is true if an ACL has obeyed "control = submission". The flag
1430 suppress_local_fixups is true if an ACL has obeyed "control =
1431 suppress_local_fixups" or -G was passed on the command-line.
1432 The flag smtp_input is true if the message is to be
1433 handled using SMTP conventions about termination and lines starting with dots.
1434 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1435
1436 If a message was successfully read, message_id[0] will be non-zero.
1437
1438 The general actions of this function are:
1439
1440 . Read the headers of the message (if any) into a chain of store
1441 blocks.
1442
1443 . If there is a "sender:" header and the message is locally originated,
1444 throw it away, unless the caller is trusted, or unless
1445 active_local_sender_retain is set - which can only happen if
1446 active_local_from_check is false.
1447
1448 . If recipients are to be extracted from the message, build the
1449 recipients list from the headers, removing any that were on the
1450 original recipients list (unless extract_addresses_remove_arguments is
1451 false), and at the same time, remove any bcc header that may be present.
1452
1453 . Get the spool file for the data, sort out its unique name, open
1454 and lock it (but don't give it the name yet).
1455
1456 . Generate a "Message-Id" header if the message doesn't have one, for
1457 locally-originated messages.
1458
1459 . Generate a "Received" header.
1460
1461 . Ensure the recipients list is fully qualified and rewritten if necessary.
1462
1463 . If there are any rewriting rules, apply them to the sender address
1464 and also to the headers.
1465
1466 . If there is no from: header, generate one, for locally-generated messages
1467 and messages in "submission mode" only.
1468
1469 . If the sender is local, check that from: is correct, and if not, generate
1470 a Sender: header, unless message comes from a trusted caller, or this
1471 feature is disabled by active_local_from_check being false.
1472
1473 . If there is no "date" header, generate one, for locally-originated
1474 or submission mode messages only.
1475
1476 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1477 dot_ends mode, to the data file. Leave it open, to hold the lock.
1478
1479 . Write the envelope and the headers to a new file.
1480
1481 . Set the name for the header file; close it.
1482
1483 . Set the name for the data file; close it.
1484
1485 Because this function can potentially be called many times in a single
1486 SMTP connection, all store should be got by store_get(), so that it will be
1487 automatically retrieved after the message is accepted.
1488
1489 FUDGE: It seems that sites on the net send out messages with just LF
1490 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1491 we make the CRs optional in all cases.
1492
1493 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1494 new regime is now in place in which bare CRs in header lines are turned into LF
1495 followed by a space, so as not to terminate the header line.
1496
1497 February 2004: A bare LF in a header line in a message whose first line was
1498 terminated by CRLF is treated in the same way as a bare CR.
1499
1500 Arguments:
1501 extract_recip TRUE if recipients are to be extracted from the message's
1502 headers
1503
1504 Returns: TRUE there are more messages to be read (SMTP input)
1505 FALSE there are no more messages to be read (non-SMTP input
1506 or SMTP connection collapsed, or other failure)
1507
1508 When reading a message for filter testing, the returned value indicates
1509 whether the headers (which is all that is read) were terminated by '.' or
1510 not. */
1511
1512 BOOL
1513 receive_msg(BOOL extract_recip)
1514 {
1515 int i;
1516 int rc = FAIL;
1517 int msg_size = 0;
1518 int process_info_len = Ustrlen(process_info);
1519 int error_rc = (error_handling == ERRORS_SENDER)?
1520 errors_sender_rc : EXIT_FAILURE;
1521 int header_size = 256;
1522 int start, end, domain, size, sptr;
1523 int id_resolution;
1524 int had_zero = 0;
1525 int prevlines_length = 0;
1526
1527 register int ptr = 0;
1528
1529 BOOL contains_resent_headers = FALSE;
1530 BOOL extracted_ignored = FALSE;
1531 BOOL first_line_ended_crlf = TRUE_UNSET;
1532 BOOL smtp_yield = TRUE;
1533 BOOL yield = FALSE;
1534
1535 BOOL resents_exist = FALSE;
1536 uschar *resent_prefix = US"";
1537 uschar *blackholed_by = NULL;
1538 uschar *blackhole_log_msg = US"";
1539 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1540
1541 flock_t lock_data;
1542 error_block *bad_addresses = NULL;
1543
1544 uschar *frozen_by = NULL;
1545 uschar *queued_by = NULL;
1546
1547 uschar *errmsg, *s;
1548 struct stat statbuf;
1549
1550 /* Final message to give to SMTP caller, and messages from ACLs */
1551
1552 uschar *smtp_reply = NULL;
1553 uschar *user_msg, *log_msg;
1554
1555 /* Working header pointers */
1556
1557 header_line *h, *next;
1558
1559 /* Flags for noting the existence of certain headers (only one left) */
1560
1561 BOOL date_header_exists = FALSE;
1562
1563 /* Pointers to receive the addresses of headers whose contents we need. */
1564
1565 header_line *from_header = NULL;
1566 header_line *subject_header = NULL;
1567 header_line *msgid_header = NULL;
1568 header_line *received_header;
1569
1570 #ifdef EXPERIMENTAL_DMARC
1571 int dmarc_up = 0;
1572 #endif /* EXPERIMENTAL_DMARC */
1573
1574 /* Variables for use when building the Received: header. */
1575
1576 uschar *timestamp;
1577 int tslen;
1578
1579 /* Release any open files that might have been cached while preparing to
1580 accept the message - e.g. by verifying addresses - because reading a message
1581 might take a fair bit of real time. */
1582
1583 search_tidyup();
1584
1585 /* Extracting the recipient list from an input file is incompatible with
1586 cutthrough delivery with the no-spool option. It shouldn't be possible
1587 to set up the combination, but just in case kill any ongoing connection. */
1588 if (extract_recip || !smtp_input)
1589 cancel_cutthrough_connection("not smtp input");
1590
1591 /* Initialize the chain of headers by setting up a place-holder for Received:
1592 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1593 pointing to the end of the chain to make adding headers simple. */
1594
1595 received_header = header_list = header_last = store_get(sizeof(header_line));
1596 header_list->next = NULL;
1597 header_list->type = htype_old;
1598 header_list->text = NULL;
1599 header_list->slen = 0;
1600
1601 /* Control block for the next header to be read. */
1602
1603 next = store_get(sizeof(header_line));
1604 next->text = store_get(header_size);
1605
1606 /* Initialize message id to be null (indicating no message read), and the
1607 header names list to be the normal list. Indicate there is no data file open
1608 yet, initialize the size and warning count, and deal with no size limit. */
1609
1610 message_id[0] = 0;
1611 data_file = NULL;
1612 data_fd = -1;
1613 spool_name = US"";
1614 message_size = 0;
1615 warning_count = 0;
1616 received_count = 1; /* For the one we will add */
1617
1618 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1619
1620 /* While reading the message, the following counts are computed. */
1621
1622 message_linecount = body_linecount = body_zerocount =
1623 max_received_linelength = 0;
1624
1625 #ifndef DISABLE_DKIM
1626 /* Call into DKIM to set up the context. In CHUNKING mode
1627 we clear the dot-stuffing flag */
1628 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1629 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1630 #endif
1631
1632 #ifdef EXPERIMENTAL_DMARC
1633 /* initialize libopendmarc */
1634 dmarc_up = dmarc_init();
1635 #endif
1636
1637 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1638 ids, and fractions of a second are required. See the comments that precede the
1639 message id creation below. */
1640
1641 (void)gettimeofday(&message_id_tv, NULL);
1642
1643 /* For other uses of the received time we can operate with granularity of one
1644 second, and for that we use the global variable received_time. This is for
1645 things like ultimate message timeouts. */
1646
1647 received_time = message_id_tv.tv_sec;
1648
1649 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1650 happen in the smtp_getc() function when it refills its buffer. */
1651
1652 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1653
1654 /* If not SMTP input, timeout happens only if configured, and we just set a
1655 single timeout for the whole message. */
1656
1657 else if (receive_timeout > 0)
1658 {
1659 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1660 alarm(receive_timeout);
1661 }
1662
1663 /* SIGTERM and SIGINT are caught always. */
1664
1665 signal(SIGTERM, data_sigterm_sigint_handler);
1666 signal(SIGINT, data_sigterm_sigint_handler);
1667
1668 /* Header lines in messages are not supposed to be very long, though when
1669 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1670 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1671 storing the header, and extend this as necessary using string_cat().
1672
1673 To cope with total lunacies, impose an upper limit on the length of the header
1674 section of the message, as otherwise the store will fill up. We must also cope
1675 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1676 Folded header lines are joined into one string, leaving the '\n' characters
1677 inside them, so that writing them out reproduces the input.
1678
1679 Loop for each character of each header; the next structure for chaining the
1680 header is set up already, with ptr the offset of the next character in
1681 next->text. */
1682
1683 for (;;)
1684 {
1685 int ch = (receive_getc)();
1686
1687 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1688 SMTP must have a correct "." terminator. */
1689
1690 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1691 {
1692 smtp_reply = handle_lost_connection(US" (header)");
1693 smtp_yield = FALSE;
1694 goto TIDYUP; /* Skip to end of function */
1695 }
1696
1697 /* See if we are at the current header's size limit - there must be at least
1698 four bytes left. This allows for the new character plus a zero, plus two for
1699 extra insertions when we are playing games with dots and carriage returns. If
1700 we are at the limit, extend the text buffer. This could have been done
1701 automatically using string_cat() but because this is a tightish loop storing
1702 only one character at a time, we choose to do it inline. Normally
1703 store_extend() will be able to extend the block; only at the end of a big
1704 store block will a copy be needed. To handle the case of very long headers
1705 (and sometimes lunatic messages can have ones that are 100s of K long) we
1706 call store_release() for strings that have been copied - if the string is at
1707 the start of a block (and therefore the only thing in it, because we aren't
1708 doing any other gets), the block gets freed. We can only do this because we
1709 know there are no other calls to store_get() going on. */
1710
1711 if (ptr >= header_size - 4)
1712 {
1713 int oldsize = header_size;
1714 /* header_size += 256; */
1715 header_size *= 2;
1716 if (!store_extend(next->text, oldsize, header_size))
1717 {
1718 uschar *newtext = store_get(header_size);
1719 memcpy(newtext, next->text, ptr);
1720 store_release(next->text);
1721 next->text = newtext;
1722 }
1723 }
1724
1725 /* Cope with receiving a binary zero. There is dispute about whether
1726 these should be allowed in RFC 822 messages. The middle view is that they
1727 should not be allowed in headers, at least. Exim takes this attitude at
1728 the moment. We can't just stomp on them here, because we don't know that
1729 this line is a header yet. Set a flag to cause scanning later. */
1730
1731 if (ch == 0) had_zero++;
1732
1733 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1734 those from data files use just LF. Treat LF in local SMTP input as a
1735 terminator too. Treat EOF as a line terminator always. */
1736
1737 if (ch == EOF) goto EOL;
1738
1739 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1740 other MTAs accept this. We are therefore forced into this "liberalisation"
1741 too, so we accept LF as a line terminator whatever the source of the message.
1742 However, if the first line of the message ended with a CRLF, we treat a bare
1743 LF specially by inserting a white space after it to ensure that the header
1744 line is not terminated. */
1745
1746 if (ch == '\n')
1747 {
1748 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1749 else if (first_line_ended_crlf) receive_ungetc(' ');
1750 goto EOL;
1751 }
1752
1753 /* This is not the end of the line. If this is SMTP input and this is
1754 the first character in the line and it is a "." character, ignore it.
1755 This implements the dot-doubling rule, though header lines starting with
1756 dots aren't exactly common. They are legal in RFC 822, though. If the
1757 following is CRLF or LF, this is the line that that terminates the
1758 entire message. We set message_ended to indicate this has happened (to
1759 prevent further reading), and break out of the loop, having freed the
1760 empty header, and set next = NULL to indicate no data line. */
1761
1762 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1763 {
1764 ch = (receive_getc)();
1765 if (ch == '\r')
1766 {
1767 ch = (receive_getc)();
1768 if (ch != '\n')
1769 {
1770 receive_ungetc(ch);
1771 ch = '\r'; /* Revert to CR */
1772 }
1773 }
1774 if (ch == '\n')
1775 {
1776 message_ended = END_DOT;
1777 store_reset(next);
1778 next = NULL;
1779 break; /* End character-reading loop */
1780 }
1781
1782 /* For non-SMTP input, the dot at the start of the line was really a data
1783 character. What is now in ch is the following character. We guaranteed
1784 enough space for this above. */
1785
1786 if (!smtp_input)
1787 {
1788 next->text[ptr++] = '.';
1789 message_size++;
1790 }
1791 }
1792
1793 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1794 remember this case if this is the first line ending. */
1795
1796 if (ch == '\r')
1797 {
1798 ch = (receive_getc)();
1799 if (ch == '\n')
1800 {
1801 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1802 goto EOL;
1803 }
1804
1805 /* Otherwise, put back the character after CR, and turn the bare CR
1806 into LF SP. */
1807
1808 ch = (receive_ungetc)(ch);
1809 next->text[ptr++] = '\n';
1810 message_size++;
1811 ch = ' ';
1812 }
1813
1814 /* We have a data character for the header line. */
1815
1816 next->text[ptr++] = ch; /* Add to buffer */
1817 message_size++; /* Total message size so far */
1818
1819 /* Handle failure due to a humungously long header section. The >= allows
1820 for the terminating \n. Add what we have so far onto the headers list so
1821 that it gets reflected in any error message, and back up the just-read
1822 character. */
1823
1824 if (message_size >= header_maxsize)
1825 {
1826 next->text[ptr] = 0;
1827 next->slen = ptr;
1828 next->type = htype_other;
1829 next->next = NULL;
1830 header_last->next = next;
1831 header_last = next;
1832
1833 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1834 "%s (more than %d characters): message abandoned",
1835 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1836
1837 if (smtp_input)
1838 {
1839 smtp_reply = US"552 Message header is ridiculously long";
1840 receive_swallow_smtp();
1841 goto TIDYUP; /* Skip to end of function */
1842 }
1843
1844 else
1845 {
1846 give_local_error(ERRMESS_VLONGHEADER,
1847 string_sprintf("message header longer than %d characters received: "
1848 "message not accepted", header_maxsize), US"", error_rc, stdin,
1849 header_list->next);
1850 /* Does not return */
1851 }
1852 }
1853
1854 continue; /* With next input character */
1855
1856 /* End of header line reached */
1857
1858 EOL:
1859
1860 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1861
1862 receive_linecount++;
1863 message_linecount++;
1864
1865 /* Keep track of maximum line length */
1866
1867 if (ptr - prevlines_length > max_received_linelength)
1868 max_received_linelength = ptr - prevlines_length;
1869 prevlines_length = ptr + 1;
1870
1871 /* Now put in the terminating newline. There is always space for
1872 at least two more characters. */
1873
1874 next->text[ptr++] = '\n';
1875 message_size++;
1876
1877 /* A blank line signals the end of the headers; release the unwanted
1878 space and set next to NULL to indicate this. */
1879
1880 if (ptr == 1)
1881 {
1882 store_reset(next);
1883 next = NULL;
1884 break;
1885 }
1886
1887 /* There is data in the line; see if the next input character is a
1888 whitespace character. If it is, we have a continuation of this header line.
1889 There is always space for at least one character at this point. */
1890
1891 if (ch != EOF)
1892 {
1893 int nextch = (receive_getc)();
1894 if (nextch == ' ' || nextch == '\t')
1895 {
1896 next->text[ptr++] = nextch;
1897 message_size++;
1898 continue; /* Iterate the loop */
1899 }
1900 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1901 else ch = EOF; /* Cause main loop to exit at end */
1902 }
1903
1904 /* We have got to the real line end. Terminate the string and release store
1905 beyond it. If it turns out to be a real header, internal binary zeros will
1906 be squashed later. */
1907
1908 next->text[ptr] = 0;
1909 next->slen = ptr;
1910 store_reset(next->text + ptr + 1);
1911
1912 /* Check the running total size against the overall message size limit. We
1913 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1914 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1915 headers - the code to read the body will then also hit the buffer. */
1916
1917 if (message_size > thismessage_size_limit) break;
1918
1919 /* A line that is not syntactically correct for a header also marks
1920 the end of the headers. In this case, we leave next containing the
1921 first data line. This might actually be several lines because of the
1922 continuation logic applied above, but that doesn't matter.
1923
1924 It turns out that smail, and presumably sendmail, accept leading lines
1925 of the form
1926
1927 From ph10 Fri Jan 5 12:35 GMT 1996
1928
1929 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1930 find any documentation of this, but for compatibility it had better be
1931 accepted. Exim restricts it to the case of non-smtp messages, and
1932 treats it as an alternative to the -f command line option. Thus it is
1933 ignored except for trusted users or filter testing. Otherwise it is taken
1934 as the sender address, unless -f was used (sendmail compatibility).
1935
1936 It further turns out that some UUCPs generate the From_line in a different
1937 format, e.g.
1938
1939 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1940
1941 The regex for matching these things is now capable of recognizing both
1942 formats (including 2- and 4-digit years in the latter). In fact, the regex
1943 is now configurable, as is the expansion string to fish out the sender.
1944
1945 Even further on it has been discovered that some broken clients send
1946 these lines in SMTP messages. There is now an option to ignore them from
1947 specified hosts or networks. Sigh. */
1948
1949 if (header_last == header_list &&
1950 (!smtp_input
1951 ||
1952 (sender_host_address != NULL &&
1953 verify_check_host(&ignore_fromline_hosts) == OK)
1954 ||
1955 (sender_host_address == NULL && ignore_fromline_local)
1956 ) &&
1957 regex_match_and_setup(regex_From, next->text, 0, -1))
1958 {
1959 if (!sender_address_forced)
1960 {
1961 uschar *uucp_sender = expand_string(uucp_from_sender);
1962 if (uucp_sender == NULL)
1963 {
1964 log_write(0, LOG_MAIN|LOG_PANIC,
1965 "expansion of \"%s\" failed after matching "
1966 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1967 }
1968 else
1969 {
1970 int start, end, domain;
1971 uschar *errmess;
1972 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1973 &start, &end, &domain, TRUE);
1974 if (newsender != NULL)
1975 {
1976 if (domain == 0 && newsender[0] != 0)
1977 newsender = rewrite_address_qualify(newsender, FALSE);
1978
1979 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1980 {
1981 sender_address = newsender;
1982
1983 if (trusted_caller || filter_test != FTEST_NONE)
1984 {
1985 authenticated_sender = NULL;
1986 originator_name = US"";
1987 sender_local = FALSE;
1988 }
1989
1990 if (filter_test != FTEST_NONE)
1991 printf("Sender taken from \"From \" line\n");
1992 }
1993 }
1994 }
1995 }
1996 }
1997
1998 /* Not a leading "From " line. Check to see if it is a valid header line.
1999 Header names may contain any non-control characters except space and colon,
2000 amazingly. */
2001
2002 else
2003 {
2004 uschar *p = next->text;
2005
2006 /* If not a valid header line, break from the header reading loop, leaving
2007 next != NULL, indicating that it holds the first line of the body. */
2008
2009 if (isspace(*p)) break;
2010 while (mac_isgraph(*p) && *p != ':') p++;
2011 while (isspace(*p)) p++;
2012 if (*p != ':')
2013 {
2014 body_zerocount = had_zero;
2015 break;
2016 }
2017
2018 /* We have a valid header line. If there were any binary zeroes in
2019 the line, stomp on them here. */
2020
2021 if (had_zero > 0)
2022 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2023
2024 /* It is perfectly legal to have an empty continuation line
2025 at the end of a header, but it is confusing to humans
2026 looking at such messages, since it looks like a blank line.
2027 Reduce confusion by removing redundant white space at the
2028 end. We know that there is at least one printing character
2029 (the ':' tested for above) so there is no danger of running
2030 off the end. */
2031
2032 p = next->text + ptr - 2;
2033 for (;;)
2034 {
2035 while (*p == ' ' || *p == '\t') p--;
2036 if (*p != '\n') break;
2037 ptr = (p--) - next->text + 1;
2038 message_size -= next->slen - ptr;
2039 next->text[ptr] = 0;
2040 next->slen = ptr;
2041 }
2042
2043 /* Add the header to the chain */
2044
2045 next->type = htype_other;
2046 next->next = NULL;
2047 header_last->next = next;
2048 header_last = next;
2049
2050 /* Check the limit for individual line lengths. This comes after adding to
2051 the chain so that the failing line is reflected if a bounce is generated
2052 (for a local message). */
2053
2054 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2055 {
2056 log_write(0, LOG_MAIN, "overlong message header line received from "
2057 "%s (more than %d characters): message abandoned",
2058 sender_host_unknown? sender_ident : sender_fullhost,
2059 header_line_maxsize);
2060
2061 if (smtp_input)
2062 {
2063 smtp_reply = US"552 A message header line is too long";
2064 receive_swallow_smtp();
2065 goto TIDYUP; /* Skip to end of function */
2066 }
2067
2068 else
2069 {
2070 give_local_error(ERRMESS_VLONGHDRLINE,
2071 string_sprintf("message header line longer than %d characters "
2072 "received: message not accepted", header_line_maxsize), US"",
2073 error_rc, stdin, header_list->next);
2074 /* Does not return */
2075 }
2076 }
2077
2078 /* Note if any resent- fields exist. */
2079
2080 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2081 {
2082 resents_exist = TRUE;
2083 resent_prefix = US"Resent-";
2084 }
2085 }
2086
2087 /* The line has been handled. If we have hit EOF, break out of the loop,
2088 indicating no pending data line. */
2089
2090 if (ch == EOF) { next = NULL; break; }
2091
2092 /* Set up for the next header */
2093
2094 header_size = 256;
2095 next = store_get(sizeof(header_line));
2096 next->text = store_get(header_size);
2097 ptr = 0;
2098 had_zero = 0;
2099 prevlines_length = 0;
2100 } /* Continue, starting to read the next header */
2101
2102 /* At this point, we have read all the headers into a data structure in main
2103 store. The first header is still the dummy placeholder for the Received: header
2104 we are going to generate a bit later on. If next != NULL, it contains the first
2105 data line - which terminated the headers before reaching a blank line (not the
2106 normal case). */
2107
2108 DEBUG(D_receive)
2109 {
2110 debug_printf(">>Headers received:\n");
2111 for (h = header_list->next; h != NULL; h = h->next)
2112 debug_printf("%s", h->text);
2113 debug_printf("\n");
2114 }
2115
2116 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2117 is dropped immediately after valid headers, the next thing we will see is EOF.
2118 We must test for this specially, as further down the reading of the data is
2119 skipped if already at EOF. */
2120
2121 if (smtp_input && (receive_feof)())
2122 {
2123 smtp_reply = handle_lost_connection(US" (after header)");
2124 smtp_yield = FALSE;
2125 goto TIDYUP; /* Skip to end of function */
2126 }
2127
2128 /* If this is a filter test run and no headers were read, output a warning
2129 in case there is a mistake in the test message. */
2130
2131 if (filter_test != FTEST_NONE && header_list->next == NULL)
2132 printf("Warning: no message headers read\n");
2133
2134
2135 /* Scan the headers to identify them. Some are merely marked for later
2136 processing; some are dealt with here. */
2137
2138 for (h = header_list->next; h != NULL; h = h->next)
2139 {
2140 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2141 if (is_resent) contains_resent_headers = TRUE;
2142
2143 switch (header_checkname(h, is_resent))
2144 {
2145 case htype_bcc:
2146 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2147 break;
2148
2149 case htype_cc:
2150 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2151 break;
2152
2153 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2154
2155 case htype_date:
2156 if (!resents_exist || is_resent) date_header_exists = TRUE;
2157 break;
2158
2159 /* Same comments as about Return-Path: below. */
2160
2161 case htype_delivery_date:
2162 if (delivery_date_remove) h->type = htype_old;
2163 break;
2164
2165 /* Same comments as about Return-Path: below. */
2166
2167 case htype_envelope_to:
2168 if (envelope_to_remove) h->type = htype_old;
2169 break;
2170
2171 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2172 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2173 header consists of just the login id of the user who called Exim, rewrite
2174 it with the gecos field first. Apply this rule to Resent-From: if there
2175 are resent- fields. */
2176
2177 case htype_from:
2178 h->type = htype_from;
2179 if (!resents_exist || is_resent)
2180 {
2181 from_header = h;
2182 if (!smtp_input)
2183 {
2184 int len;
2185 uschar *s = Ustrchr(h->text, ':') + 1;
2186 while (isspace(*s)) s++;
2187 len = h->slen - (s - h->text) - 1;
2188 if (Ustrlen(originator_login) == len &&
2189 strncmpic(s, originator_login, len) == 0)
2190 {
2191 uschar *name = is_resent? US"Resent-From" : US"From";
2192 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2193 originator_login, qualify_domain_sender);
2194 from_header = header_last;
2195 h->type = htype_old;
2196 DEBUG(D_receive|D_rewrite)
2197 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2198 }
2199 }
2200 }
2201 break;
2202
2203 /* Identify the Message-id: header for generating "in-reply-to" in the
2204 autoreply transport. For incoming logging, save any resent- value. In both
2205 cases, take just the first of any multiples. */
2206
2207 case htype_id:
2208 if (msgid_header == NULL && (!resents_exist || is_resent))
2209 {
2210 msgid_header = h;
2211 h->type = htype_id;
2212 }
2213 break;
2214
2215 /* Flag all Received: headers */
2216
2217 case htype_received:
2218 h->type = htype_received;
2219 received_count++;
2220 break;
2221
2222 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2223
2224 case htype_reply_to:
2225 h->type = htype_reply_to;
2226 break;
2227
2228 /* The Return-path: header is supposed to be added to messages when
2229 they leave the SMTP system. We shouldn't receive messages that already
2230 contain Return-path. However, since Exim generates Return-path: on
2231 local delivery, resent messages may well contain it. We therefore
2232 provide an option (which defaults on) to remove any Return-path: headers
2233 on input. Removal actually means flagging as "old", which prevents the
2234 header being transmitted with the message. */
2235
2236 case htype_return_path:
2237 if (return_path_remove) h->type = htype_old;
2238
2239 /* If we are testing a mail filter file, use the value of the
2240 Return-Path: header to set up the return_path variable, which is not
2241 otherwise set. However, remove any <> that surround the address
2242 because the variable doesn't have these. */
2243
2244 if (filter_test != FTEST_NONE)
2245 {
2246 uschar *start = h->text + 12;
2247 uschar *end = start + Ustrlen(start);
2248 while (isspace(*start)) start++;
2249 while (end > start && isspace(end[-1])) end--;
2250 if (*start == '<' && end[-1] == '>')
2251 {
2252 start++;
2253 end--;
2254 }
2255 return_path = string_copyn(start, end - start);
2256 printf("Return-path taken from \"Return-path:\" header line\n");
2257 }
2258 break;
2259
2260 /* If there is a "Sender:" header and the message is locally originated,
2261 and from an untrusted caller and suppress_local_fixups is not set, or if we
2262 are in submission mode for a remote message, mark it "old" so that it will
2263 not be transmitted with the message, unless active_local_sender_retain is
2264 set. (This can only be true if active_local_from_check is false.) If there
2265 are any resent- headers in the message, apply this rule to Resent-Sender:
2266 instead of Sender:. Messages with multiple resent- header sets cannot be
2267 tidily handled. (For this reason, at least one MUA - Pine - turns old
2268 resent- headers into X-resent- headers when resending, leaving just one
2269 set.) */
2270
2271 case htype_sender:
2272 h->type = ((!active_local_sender_retain &&
2273 (
2274 (sender_local && !trusted_caller && !suppress_local_fixups)
2275 || submission_mode
2276 )
2277 ) &&
2278 (!resents_exist||is_resent))?
2279 htype_old : htype_sender;
2280 break;
2281
2282 /* Remember the Subject: header for logging. There is no Resent-Subject */
2283
2284 case htype_subject:
2285 subject_header = h;
2286 break;
2287
2288 /* "To:" gets flagged, and the existence of a recipient header is noted,
2289 whether it's resent- or not. */
2290
2291 case htype_to:
2292 h->type = htype_to;
2293 /****
2294 to_or_cc_header_exists = TRUE;
2295 ****/
2296 break;
2297 }
2298 }
2299
2300 /* Extract recipients from the headers if that is required (the -t option).
2301 Note that this is documented as being done *before* any address rewriting takes
2302 place. There are two possibilities:
2303
2304 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2305 recipients already listed are to be REMOVED from the message. Smail 3 works
2306 like this. We need to build a non-recipients tree for that list, because in
2307 subsequent processing this data is held in a tree and that's what the
2308 spool_write_header() function expects. Make sure that non-recipient addresses
2309 are fully qualified and rewritten if necessary.
2310
2311 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2312 those in the command line arguments (and it is rumoured some other MTAs do
2313 this). Therefore, there is an option to make Exim behave this way.
2314
2315 *** Notes on "Resent-" header lines ***
2316
2317 The presence of resent-headers in the message makes -t horribly ambiguous.
2318 Experiments with sendmail showed that it uses recipients for all resent-
2319 headers, totally ignoring the concept of "sets of resent- headers" as described
2320 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2321 with all the addresses in one instance of each header.
2322
2323 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2324 error for -t if there were resent- headers in the message. However, after a
2325 discussion on the mailing list, I've learned that there are MUAs that use
2326 resent- headers with -t, and also that the stuff about sets of resent- headers
2327 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2328 message with -t and resent- header lines makes sure that only *its* resent-
2329 headers are present; previous ones are often renamed as X-resent- for example.
2330
2331 Consequently, Exim has been changed so that, if any resent- header lines are
2332 present, the recipients are taken from all of the appropriate resent- lines,
2333 and not from the ordinary To:, Cc:, etc. */
2334
2335 if (extract_recip)
2336 {
2337 int rcount = 0;
2338 error_block **bnext = &bad_addresses;
2339
2340 if (extract_addresses_remove_arguments)
2341 {
2342 while (recipients_count-- > 0)
2343 {
2344 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2345 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2346 tree_add_nonrecipient(s);
2347 }
2348 recipients_list = NULL;
2349 recipients_count = recipients_list_max = 0;
2350 }
2351
2352 /* Now scan the headers */
2353
2354 for (h = header_list->next; h != NULL; h = h->next)
2355 {
2356 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2357 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2358 {
2359 uschar *s = Ustrchr(h->text, ':') + 1;
2360 while (isspace(*s)) s++;
2361
2362 parse_allow_group = TRUE; /* Allow address group syntax */
2363
2364 while (*s != 0)
2365 {
2366 uschar *ss = parse_find_address_end(s, FALSE);
2367 uschar *recipient, *errmess, *p, *pp;
2368 int start, end, domain;
2369
2370 /* Check on maximum */
2371
2372 if (recipients_max > 0 && ++rcount > recipients_max)
2373 {
2374 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2375 US"message rejected: ", error_rc, stdin, NULL);
2376 /* Does not return */
2377 }
2378
2379 /* Make a copy of the address, and remove any internal newlines. These
2380 may be present as a result of continuations of the header line. The
2381 white space that follows the newline must not be removed - it is part
2382 of the header. */
2383
2384 pp = recipient = store_get(ss - s + 1);
2385 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2386 *pp = 0;
2387
2388 #ifdef SUPPORT_I18N
2389 {
2390 BOOL b = allow_utf8_domains;
2391 allow_utf8_domains = TRUE;
2392 #endif
2393 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2394 &domain, FALSE);
2395
2396 #ifdef SUPPORT_I18N
2397 if (string_is_utf8(recipient))
2398 message_smtputf8 = TRUE;
2399 else
2400 allow_utf8_domains = b;
2401 }
2402 #endif
2403
2404 /* Keep a list of all the bad addresses so we can send a single
2405 error message at the end. However, an empty address is not an error;
2406 just ignore it. This can come from an empty group list like
2407
2408 To: Recipients of list:;
2409
2410 If there are no recipients at all, an error will occur later. */
2411
2412 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2413 {
2414 int len = Ustrlen(s);
2415 error_block *b = store_get(sizeof(error_block));
2416 while (len > 0 && isspace(s[len-1])) len--;
2417 b->next = NULL;
2418 b->text1 = string_printing(string_copyn(s, len));
2419 b->text2 = errmess;
2420 *bnext = b;
2421 bnext = &(b->next);
2422 }
2423
2424 /* If the recipient is already in the nonrecipients tree, it must
2425 have appeared on the command line with the option extract_addresses_
2426 remove_arguments set. Do not add it to the recipients, and keep a note
2427 that this has happened, in order to give a better error if there are
2428 no recipients left. */
2429
2430 else if (recipient != NULL)
2431 {
2432 if (tree_search(tree_nonrecipients, recipient) == NULL)
2433 receive_add_recipient(recipient, -1);
2434 else
2435 extracted_ignored = TRUE;
2436 }
2437
2438 /* Move on past this address */
2439
2440 s = ss + (*ss? 1:0);
2441 while (isspace(*s)) s++;
2442 } /* Next address */
2443
2444 parse_allow_group = FALSE; /* Reset group syntax flags */
2445 parse_found_group = FALSE;
2446
2447 /* If this was the bcc: header, mark it "old", which means it
2448 will be kept on the spool, but not transmitted as part of the
2449 message. */
2450
2451 if (h->type == htype_bcc) h->type = htype_old;
2452 } /* For appropriate header line */
2453 } /* For each header line */
2454
2455 }
2456
2457 /* Now build the unique message id. This has changed several times over the
2458 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2459 Retaining all the history in the comment has become too unwieldy - read
2460 previous release sources if you want it.
2461
2462 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2463 The first part is the current time, in seconds. The second part is the current
2464 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2465 can hold a number in the range 0-3843. It used to be a computed sequence
2466 number, but is now the fractional component of the current time in units of
2467 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2468 received, Exim ensures that the timer has ticked at the appropriate level
2469 before proceeding, to avoid duplication if the pid happened to be re-used
2470 within the same time period. It seems likely that most messages will take at
2471 least half a millisecond to be received, so no delay will normally be
2472 necessary. At least for some time...
2473
2474 There is a modification when localhost_number is set. Formerly this was allowed
2475 to be as large as 255. Now it is restricted to the range 0-16, and the final
2476 component of the message id becomes (localhost_number * 200) + fractional time
2477 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2478
2479 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2480 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2481 still allows the tttttt field to hold a large enough number to last for some
2482 more decades, and the final two-digit field can hold numbers up to 1295, which
2483 is enough for milliseconds (instead of 1/2000 of a second).
2484
2485 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2486 pid, so it is probably safe because pids have to be positive. The
2487 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2488 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2489
2490 Note that string_base62() returns its data in a static storage block, so it
2491 must be copied before calling string_base62() again. It always returns exactly
2492 6 characters.
2493
2494 There doesn't seem to be anything in the RFC which requires a message id to
2495 start with a letter, but Smail was changed to ensure this. The external form of
2496 the message id (as supplied by string expansion) therefore starts with an
2497 additional leading 'E'. The spool file names do not include this leading
2498 letter and it is not used internally.
2499
2500 NOTE: If ever the format of message ids is changed, the regular expression for
2501 checking that a string is in this format must be updated in a corresponding
2502 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2503 must also be changed to reflect the correct string length. Then, of course,
2504 other programs that rely on the message id format will need updating too. */
2505
2506 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2507 message_id[6] = '-';
2508 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2509
2510 /* Deal with the case where the host number is set. The value of the number was
2511 checked when it was read, to ensure it isn't too big. The timing granularity is
2512 left in id_resolution so that an appropriate wait can be done after receiving
2513 the message, if necessary (we hope it won't be). */
2514
2515 if (host_number_string != NULL)
2516 {
2517 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2518 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2519 string_base62((long int)(
2520 host_number * (1000000/id_resolution) +
2521 message_id_tv.tv_usec/id_resolution)) + 4);
2522 }
2523
2524 /* Host number not set: final field is just the fractional time at an
2525 appropriate resolution. */
2526
2527 else
2528 {
2529 id_resolution = (BASE_62 == 62)? 500 : 1000;
2530 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2531 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2532 }
2533
2534 /* Add the current message id onto the current process info string if
2535 it will fit. */
2536
2537 (void)string_format(process_info + process_info_len,
2538 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2539
2540 /* If we are using multiple input directories, set up the one for this message
2541 to be the least significant base-62 digit of the time of arrival. Otherwise
2542 ensure that it is an empty string. */
2543
2544 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2545
2546 /* Now that we have the message-id, if there is no message-id: header, generate
2547 one, but only for local (without suppress_local_fixups) or submission mode
2548 messages. This can be user-configured if required, but we had better flatten
2549 any illegal characters therein. */
2550
2551 if (msgid_header == NULL &&
2552 ((sender_host_address == NULL && !suppress_local_fixups)
2553 || submission_mode))
2554 {
2555 uschar *p;
2556 uschar *id_text = US"";
2557 uschar *id_domain = primary_hostname;
2558
2559 /* Permit only letters, digits, dots, and hyphens in the domain */
2560
2561 if (message_id_domain != NULL)
2562 {
2563 uschar *new_id_domain = expand_string(message_id_domain);
2564 if (new_id_domain == NULL)
2565 {
2566 if (!expand_string_forcedfail)
2567 log_write(0, LOG_MAIN|LOG_PANIC,
2568 "expansion of \"%s\" (message_id_header_domain) "
2569 "failed: %s", message_id_domain, expand_string_message);
2570 }
2571 else if (*new_id_domain != 0)
2572 {
2573 id_domain = new_id_domain;
2574 for (p = id_domain; *p != 0; p++)
2575 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2576 }
2577 }
2578
2579 /* Permit all characters except controls and RFC 2822 specials in the
2580 additional text part. */
2581
2582 if (message_id_text != NULL)
2583 {
2584 uschar *new_id_text = expand_string(message_id_text);
2585 if (new_id_text == NULL)
2586 {
2587 if (!expand_string_forcedfail)
2588 log_write(0, LOG_MAIN|LOG_PANIC,
2589 "expansion of \"%s\" (message_id_header_text) "
2590 "failed: %s", message_id_text, expand_string_message);
2591 }
2592 else if (*new_id_text != 0)
2593 {
2594 id_text = new_id_text;
2595 for (p = id_text; *p != 0; p++)
2596 if (mac_iscntrl_or_special(*p)) *p = '-';
2597 }
2598 }
2599
2600 /* Add the header line
2601 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2602 * appended, to preserve classical expectations of header ordering. */
2603
2604 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2605 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2606 (*id_text == 0)? "" : ".", id_text, id_domain);
2607 }
2608
2609 /* If we are to log recipients, keep a copy of the raw ones before any possible
2610 rewriting. Must copy the count, because later ACLs and the local_scan()
2611 function may mess with the real recipients. */
2612
2613 if (LOGGING(received_recipients))
2614 {
2615 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2616 for (i = 0; i < recipients_count; i++)
2617 raw_recipients[i] = string_copy(recipients_list[i].address);
2618 raw_recipients_count = recipients_count;
2619 }
2620
2621 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2622 recipients will get here only if the conditions were right (allow_unqualified_
2623 recipient is TRUE). */
2624
2625 for (i = 0; i < recipients_count; i++)
2626 recipients_list[i].address =
2627 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2628 global_rewrite_rules, rewrite_existflags);
2629
2630 /* If there is no From: header, generate one for local (without
2631 suppress_local_fixups) or submission_mode messages. If there is no sender
2632 address, but the sender is local or this is a local delivery error, use the
2633 originator login. This shouldn't happen for genuine bounces, but might happen
2634 for autoreplies. The addition of From: must be done *before* checking for the
2635 possible addition of a Sender: header, because untrusted_set_sender allows an
2636 untrusted user to set anything in the envelope (which might then get info
2637 From:) but we still want to ensure a valid Sender: if it is required. */
2638
2639 if (from_header == NULL &&
2640 ((sender_host_address == NULL && !suppress_local_fixups)
2641 || submission_mode))
2642 {
2643 uschar *oname = US"";
2644
2645 /* Use the originator_name if this is a locally submitted message and the
2646 caller is not trusted. For trusted callers, use it only if -F was used to
2647 force its value or if we have a non-SMTP message for which -f was not used
2648 to set the sender. */
2649
2650 if (sender_host_address == NULL)
2651 {
2652 if (!trusted_caller || sender_name_forced ||
2653 (!smtp_input && !sender_address_forced))
2654 oname = originator_name;
2655 }
2656
2657 /* For non-locally submitted messages, the only time we use the originator
2658 name is when it was forced by the /name= option on control=submission. */
2659
2660 else
2661 {
2662 if (submission_name != NULL) oname = submission_name;
2663 }
2664
2665 /* Envelope sender is empty */
2666
2667 if (sender_address[0] == 0)
2668 {
2669 uschar *fromstart, *fromend;
2670
2671 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2672 oname, (oname[0] == 0)? "" : " <");
2673 fromend = (oname[0] == 0)? US"" : US">";
2674
2675 if (sender_local || local_error_message)
2676 {
2677 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2678 local_part_quote(originator_login), qualify_domain_sender,
2679 fromend);
2680 }
2681 else if (submission_mode && authenticated_id != NULL)
2682 {
2683 if (submission_domain == NULL)
2684 {
2685 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2686 local_part_quote(authenticated_id), qualify_domain_sender,
2687 fromend);
2688 }
2689 else if (submission_domain[0] == 0) /* empty => whole address set */
2690 {
2691 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2692 fromend);
2693 }
2694 else
2695 {
2696 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2697 local_part_quote(authenticated_id), submission_domain,
2698 fromend);
2699 }
2700 from_header = header_last; /* To get it checked for Sender: */
2701 }
2702 }
2703
2704 /* There is a non-null envelope sender. Build the header using the original
2705 sender address, before any rewriting that might have been done while
2706 verifying it. */
2707
2708 else
2709 {
2710 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2711 oname,
2712 (oname[0] == 0)? "" : " <",
2713 (sender_address_unrewritten == NULL)?
2714 sender_address : sender_address_unrewritten,
2715 (oname[0] == 0)? "" : ">");
2716
2717 from_header = header_last; /* To get it checked for Sender: */
2718 }
2719 }
2720
2721
2722 /* If the sender is local (without suppress_local_fixups), or if we are in
2723 submission mode and there is an authenticated_id, check that an existing From:
2724 is correct, and if not, generate a Sender: header, unless disabled. Any
2725 previously-existing Sender: header was removed above. Note that sender_local,
2726 as well as being TRUE if the caller of exim is not trusted, is also true if a
2727 trusted caller did not supply a -f argument for non-smtp input. To allow
2728 trusted callers to forge From: without supplying -f, we have to test explicitly
2729 here. If the From: header contains more than one address, then the call to
2730 parse_extract_address fails, and a Sender: header is inserted, as required. */
2731
2732 if (from_header != NULL &&
2733 (active_local_from_check &&
2734 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2735 (submission_mode && authenticated_id != NULL))
2736 ))
2737 {
2738 BOOL make_sender = TRUE;
2739 int start, end, domain;
2740 uschar *errmess;
2741 uschar *from_address =
2742 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2743 &start, &end, &domain, FALSE);
2744 uschar *generated_sender_address;
2745
2746 if (submission_mode)
2747 {
2748 if (submission_domain == NULL)
2749 {
2750 generated_sender_address = string_sprintf("%s@%s",
2751 local_part_quote(authenticated_id), qualify_domain_sender);
2752 }
2753 else if (submission_domain[0] == 0) /* empty => full address */
2754 {
2755 generated_sender_address = string_sprintf("%s",
2756 authenticated_id);
2757 }
2758 else
2759 {
2760 generated_sender_address = string_sprintf("%s@%s",
2761 local_part_quote(authenticated_id), submission_domain);
2762 }
2763 }
2764 else
2765 generated_sender_address = string_sprintf("%s@%s",
2766 local_part_quote(originator_login), qualify_domain_sender);
2767
2768 /* Remove permitted prefixes and suffixes from the local part of the From:
2769 address before doing the comparison with the generated sender. */
2770
2771 if (from_address != NULL)
2772 {
2773 int slen;
2774 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2775
2776 if (at != NULL) *at = 0;
2777 from_address += route_check_prefix(from_address, local_from_prefix);
2778 slen = route_check_suffix(from_address, local_from_suffix);
2779 if (slen > 0)
2780 {
2781 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2782 from_address += slen;
2783 }
2784 if (at != NULL) *at = '@';
2785
2786 if (strcmpic(generated_sender_address, from_address) == 0 ||
2787 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2788 make_sender = FALSE;
2789 }
2790
2791 /* We have to cause the Sender header to be rewritten if there are
2792 appropriate rewriting rules. */
2793
2794 if (make_sender)
2795 {
2796 if (submission_mode && submission_name == NULL)
2797 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2798 generated_sender_address);
2799 else
2800 header_add(htype_sender, "%sSender: %s <%s>\n",
2801 resent_prefix,
2802 submission_mode? submission_name : originator_name,
2803 generated_sender_address);
2804 }
2805
2806 /* Ensure that a non-null envelope sender address corresponds to the
2807 submission mode sender address. */
2808
2809 if (submission_mode && sender_address[0] != 0)
2810 {
2811 if (sender_address_unrewritten == NULL)
2812 sender_address_unrewritten = sender_address;
2813 sender_address = generated_sender_address;
2814 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2815 log_write(L_address_rewrite, LOG_MAIN,
2816 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2817 sender_address_unrewritten, generated_sender_address);
2818 }
2819 }
2820
2821 /* If there are any rewriting rules, apply them to the sender address, unless
2822 it has already been rewritten as part of verification for SMTP input. */
2823
2824 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2825 sender_address[0] != 0)
2826 {
2827 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2828 global_rewrite_rules, rewrite_existflags);
2829 DEBUG(D_receive|D_rewrite)
2830 debug_printf("rewritten sender = %s\n", sender_address);
2831 }
2832
2833
2834 /* The headers must be run through rewrite_header(), because it ensures that
2835 addresses are fully qualified, as well as applying any rewriting rules that may
2836 exist.
2837
2838 Qualification of header addresses in a message from a remote host happens only
2839 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2840 appropriate. For local messages, qualification always happens, unless -bnq is
2841 used to explicitly suppress it. No rewriting is done for an unqualified address
2842 that is left untouched.
2843
2844 We start at the second header, skipping our own Received:. This rewriting is
2845 documented as happening *after* recipient addresses are taken from the headers
2846 by the -t command line option. An added Sender: gets rewritten here. */
2847
2848 for (h = header_list->next; h != NULL; h = h->next)
2849 {
2850 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2851 rewrite_existflags, TRUE);
2852 if (newh != NULL) h = newh;
2853 }
2854
2855
2856 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2857 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2858 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2859 exists, this applies to the set of resent- headers rather than the normal set.
2860
2861 The requirement for a recipient header has been removed in RFC 2822. At this
2862 point in the code, earlier versions of Exim added a To: header for locally
2863 submitted messages, and an empty Bcc: header for others. In the light of the
2864 changes in RFC 2822, this was dropped in November 2003. */
2865
2866
2867 /* If there is no date header, generate one if the message originates locally
2868 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2869 submission mode flag is set. Messages without Date: are not valid, but it seems
2870 to be more confusing if Exim adds one to all remotely-originated messages.
2871 As per Message-Id, we prepend if resending, else append.
2872 */
2873
2874 if (!date_header_exists &&
2875 ((sender_host_address == NULL && !suppress_local_fixups)
2876 || submission_mode))
2877 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2878 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2879
2880 search_tidyup(); /* Free any cached resources */
2881
2882 /* Show the complete set of headers if debugging. Note that the first one (the
2883 new Received:) has not yet been set. */
2884
2885 DEBUG(D_receive)
2886 {
2887 debug_printf(">>Headers after rewriting and local additions:\n");
2888 for (h = header_list->next; h != NULL; h = h->next)
2889 debug_printf("%c %s", h->type, h->text);
2890 debug_printf("\n");
2891 }
2892
2893 /* The headers are now complete in store. If we are running in filter
2894 testing mode, that is all this function does. Return TRUE if the message
2895 ended with a dot. */
2896
2897 if (filter_test != FTEST_NONE)
2898 {
2899 process_info[process_info_len] = 0;
2900 return message_ended == END_DOT;
2901 }
2902
2903 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2904 think more if it could be handled. Cannot do onward CHUNKING unless
2905 inbound is, but inbound chunking ought to be ok with outbound plain.
2906 Could we do onward CHUNKING given inbound CHUNKING?
2907 */
2908 if (chunking_state > CHUNKING_OFFERED)
2909 cancel_cutthrough_connection("chunking active");
2910
2911 /* Cutthrough delivery:
2912 We have to create the Received header now rather than at the end of reception,
2913 so the timestamp behaviour is a change to the normal case.
2914 XXX Ensure this gets documented XXX.
2915 Having created it, send the headers to the destination. */
2916 if (cutthrough.fd >= 0)
2917 {
2918 if (received_count > received_headers_max)
2919 {
2920 cancel_cutthrough_connection("too many headers");
2921 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2922 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2923 "Too many \"Received\" headers",
2924 sender_address,
2925 (sender_fullhost == NULL)? "" : " H=",
2926 (sender_fullhost == NULL)? US"" : sender_fullhost,
2927 (sender_ident == NULL)? "" : " U=",
2928 (sender_ident == NULL)? US"" : sender_ident);
2929 message_id[0] = 0; /* Indicate no message accepted */
2930 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2931 goto TIDYUP; /* Skip to end of function */
2932 }
2933 received_header_gen();
2934 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2935 (void) cutthrough_headers_send();
2936 }
2937
2938
2939 /* Open a new spool file for the data portion of the message. We need
2940 to access it both via a file descriptor and a stream. Try to make the
2941 directory if it isn't there. */
2942
2943 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
2944 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
2945
2946 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
2947 {
2948 if (errno == ENOENT)
2949 {
2950 (void) directory_make(spool_directory,
2951 spool_sname(US"input", message_subdir),
2952 INPUT_DIRECTORY_MODE, TRUE);
2953 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2954 }
2955 if (data_fd < 0)
2956 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2957 spool_name, strerror(errno));
2958 }
2959
2960 /* Make sure the file's group is the Exim gid, and double-check the mode
2961 because the group setting doesn't always get set automatically. */
2962
2963 if (fchown(data_fd, exim_uid, exim_gid))
2964 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2965 "Failed setting ownership on spool file %s: %s",
2966 spool_name, strerror(errno));
2967 (void)fchmod(data_fd, SPOOL_MODE);
2968
2969 /* We now have data file open. Build a stream for it and lock it. We lock only
2970 the first line of the file (containing the message ID) because otherwise there
2971 are problems when Exim is run under Cygwin (I'm told). See comments in
2972 spool_in.c, where the same locking is done. */
2973
2974 data_file = fdopen(data_fd, "w+");
2975 lock_data.l_type = F_WRLCK;
2976 lock_data.l_whence = SEEK_SET;
2977 lock_data.l_start = 0;
2978 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2979
2980 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2981 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2982 errno, strerror(errno));
2983
2984 /* We have an open, locked data file. Write the message id to it to make it
2985 self-identifying. Then read the remainder of the input of this message and
2986 write it to the data file. If the variable next != NULL, it contains the first
2987 data line (which was read as a header but then turned out not to have the right
2988 format); write it (remembering that it might contain binary zeros). The result
2989 of fwrite() isn't inspected; instead we call ferror() below. */
2990
2991 fprintf(data_file, "%s-D\n", message_id);
2992 if (next != NULL)
2993 {
2994 uschar *s = next->text;
2995 int len = next->slen;
2996 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2997 body_linecount++; /* Assumes only 1 line */
2998 }
2999
3000 /* Note that we might already be at end of file, or the logical end of file
3001 (indicated by '.'), or might have encountered an error while writing the
3002 message id or "next" line. */
3003
3004 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3005 {
3006 if (smtp_input)
3007 {
3008 message_ended = chunking_state > CHUNKING_OFFERED
3009 ? read_message_bdat_smtp(data_file)
3010 : read_message_data_smtp(data_file);
3011 receive_linecount++; /* The terminating "." line */
3012 }
3013 else message_ended = read_message_data(data_file);
3014
3015 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3016 message_linecount += body_linecount;
3017
3018 switch (message_ended)
3019 {
3020 /* Handle premature termination of SMTP */
3021
3022 case END_EOF:
3023 if (smtp_input)
3024 {
3025 Uunlink(spool_name); /* Lose data file when closed */
3026 cancel_cutthrough_connection("sender closed connection");
3027 message_id[0] = 0; /* Indicate no message accepted */
3028 smtp_reply = handle_lost_connection(US"");
3029 smtp_yield = FALSE;
3030 goto TIDYUP; /* Skip to end of function */
3031 }
3032 break;
3033
3034 /* Handle message that is too big. Don't use host_or_ident() in the log
3035 message; we want to see the ident value even for non-remote messages. */
3036
3037 case END_SIZE:
3038 Uunlink(spool_name); /* Lose the data file when closed */
3039 cancel_cutthrough_connection("mail too big");
3040 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3041
3042 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3043 "message too big: read=%d max=%d",
3044 sender_address,
3045 (sender_fullhost == NULL)? "" : " H=",
3046 (sender_fullhost == NULL)? US"" : sender_fullhost,
3047 (sender_ident == NULL)? "" : " U=",
3048 (sender_ident == NULL)? US"" : sender_ident,
3049 message_size,
3050 thismessage_size_limit);
3051
3052 if (smtp_input)
3053 {
3054 smtp_reply = US"552 Message size exceeds maximum permitted";
3055 message_id[0] = 0; /* Indicate no message accepted */
3056 goto TIDYUP; /* Skip to end of function */
3057 }
3058 else
3059 {
3060 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3061 give_local_error(ERRMESS_TOOBIG,
3062 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3063 US"message rejected: ", error_rc, data_file, header_list);
3064 /* Does not return */
3065 }
3066 break;
3067
3068 /* Handle bad BDAT protocol sequence */
3069
3070 case END_PROTOCOL:
3071 Uunlink(spool_name); /* Lose the data file when closed */
3072 cancel_cutthrough_connection("sender protocol error");
3073 smtp_reply = US""; /* Response already sent */
3074 message_id[0] = 0; /* Indicate no message accepted */
3075 goto TIDYUP; /* Skip to end of function */
3076 }
3077 }
3078
3079 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3080 example, there may be some expansion in an ACL that uses a timer.) */
3081
3082 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3083
3084 /* The message body has now been read into the data file. Call fflush() to
3085 empty the buffers in C, and then call fsync() to get the data written out onto
3086 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3087 having to do this). If there was an I/O error on either input or output,
3088 attempt to send an error message, and unlink the spool file. For non-SMTP input
3089 we can then give up. Note that for SMTP input we must swallow the remainder of
3090 the input in cases of output errors, since the far end doesn't expect to see
3091 anything until the terminating dot line is sent. */
3092
3093 if (fflush(data_file) == EOF || ferror(data_file) ||
3094 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3095 {
3096 uschar *msg_errno = US strerror(errno);
3097 BOOL input_error = (receive_ferror)() != 0;
3098 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3099 input_error? "Input read" : "Spool write",
3100 msg_errno,
3101 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3102
3103 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3104 Uunlink(spool_name); /* Lose the data file */
3105 cancel_cutthrough_connection("error writing spoolfile");
3106
3107 if (smtp_input)
3108 {
3109 if (input_error)
3110 smtp_reply = US"451 Error while reading input data";
3111 else
3112 {
3113 smtp_reply = US"451 Error while writing spool file";
3114 receive_swallow_smtp();
3115 }
3116 message_id[0] = 0; /* Indicate no message accepted */
3117 goto TIDYUP; /* Skip to end of function */
3118 }
3119
3120 else
3121 {
3122 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3123 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3124 header_list);
3125 /* Does not return */
3126 }
3127 }
3128
3129
3130 /* No I/O errors were encountered while writing the data file. */
3131
3132 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3133
3134
3135 /* If there were any bad addresses extracted by -t, or there were no recipients
3136 left after -t, send a message to the sender of this message, or write it to
3137 stderr if the error handling option is set that way. Note that there may
3138 legitimately be no recipients for an SMTP message if they have all been removed
3139 by "discard".
3140
3141 We need to rewind the data file in order to read it. In the case of no
3142 recipients or stderr error writing, throw the data file away afterwards, and
3143 exit. (This can't be SMTP, which always ensures there's at least one
3144 syntactically good recipient address.) */
3145
3146 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3147 {
3148 DEBUG(D_receive)
3149 {
3150 if (recipients_count == 0) debug_printf("*** No recipients\n");
3151 if (bad_addresses != NULL)
3152 {
3153 error_block *eblock = bad_addresses;
3154 debug_printf("*** Bad address(es)\n");
3155 while (eblock != NULL)
3156 {
3157 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3158 eblock = eblock->next;
3159 }
3160 }
3161 }
3162
3163 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3164
3165 /* If configured to send errors to the sender, but this fails, force
3166 a failure error code. We use a special one for no recipients so that it
3167 can be detected by the autoreply transport. Otherwise error_rc is set to
3168 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3169 it is EXIT_SUCCESS. */
3170
3171 if (error_handling == ERRORS_SENDER)
3172 {
3173 if (!moan_to_sender(
3174 (bad_addresses == NULL)?
3175 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3176 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3177 bad_addresses, header_list, data_file, FALSE))
3178 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3179 }
3180 else
3181 {
3182 if (bad_addresses == NULL)
3183 {
3184 if (extracted_ignored)
3185 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3186 else
3187 fprintf(stderr, "exim: no recipients in message\n");
3188 }
3189 else
3190 {
3191 fprintf(stderr, "exim: invalid address%s",
3192 (bad_addresses->next == NULL)? ":" : "es:\n");
3193 while (bad_addresses != NULL)
3194 {
3195 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3196 bad_addresses->text2);
3197 bad_addresses = bad_addresses->next;
3198 }
3199 }
3200 }
3201
3202 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3203 {
3204 Uunlink(spool_name);
3205 (void)fclose(data_file);
3206 exim_exit(error_rc);
3207 }
3208 }
3209
3210 /* Data file successfully written. Generate text for the Received: header by
3211 expanding the configured string, and adding a timestamp. By leaving this
3212 operation till now, we ensure that the timestamp is the time that message
3213 reception was completed. However, this is deliberately done before calling the
3214 data ACL and local_scan().
3215
3216 This Received: header may therefore be inspected by the data ACL and by code in
3217 the local_scan() function. When they have run, we update the timestamp to be
3218 the final time of reception.
3219
3220 If there is just one recipient, set up its value in the $received_for variable
3221 for use when we generate the Received: header.
3222
3223 Note: the checking for too many Received: headers is handled by the delivery
3224 code. */
3225 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3226
3227 if (received_header->text == NULL) /* Non-cutthrough case */
3228 {
3229 received_header_gen();
3230
3231 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3232
3233 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3234 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3235
3236 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3237 now, before running the DATA ACL. */
3238
3239 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3240 }
3241 else
3242 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3243 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3244
3245 /* If an ACL is specified for checking things at this stage of reception of a
3246 message, run it, unless all the recipients were removed by "discard" in earlier
3247 ACLs. That is the only case in which recipients_count can be zero at this
3248 stage. Set deliver_datafile to point to the data file so that $message_body and
3249 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3250 */
3251
3252 deliver_datafile = data_fd;
3253 user_msg = NULL;
3254
3255 enable_dollar_recipients = TRUE;
3256
3257 if (recipients_count == 0)
3258 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3259
3260 else
3261 {
3262 /* Handle interactive SMTP messages */
3263
3264 if (smtp_input && !smtp_batched_input)
3265 {
3266
3267 #ifndef DISABLE_DKIM
3268 if (!dkim_disable_verify)
3269 {
3270 /* Finish verification, this will log individual signature results to
3271 the mainlog */
3272 dkim_exim_verify_finish();
3273
3274 /* Check if we must run the DKIM ACL */
3275 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3276 {
3277 uschar *dkim_verify_signers_expanded =
3278 expand_string(dkim_verify_signers);
3279 if (!dkim_verify_signers_expanded)
3280 log_write(0, LOG_MAIN|LOG_PANIC,
3281 "expansion of dkim_verify_signers option failed: %s",
3282 expand_string_message);
3283
3284 else
3285 {
3286 int sep = 0;
3287 const uschar *ptr = dkim_verify_signers_expanded;
3288 uschar *item = NULL;
3289 uschar *seen_items = NULL;
3290 int seen_items_size = 0;
3291 int seen_items_offset = 0;
3292 /* Default to OK when no items are present */
3293 rc = OK;
3294 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3295 {
3296 /* Prevent running ACL for an empty item */
3297 if (!item || !*item) continue;
3298
3299 /* Only run ACL once for each domain or identity,
3300 no matter how often it appears in the expanded list. */
3301 if (seen_items)
3302 {
3303 uschar *seen_item = NULL;
3304 const uschar *seen_items_list = seen_items;
3305 BOOL seen_this_item = FALSE;
3306
3307 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3308 NULL, 0)))
3309 if (Ustrcmp(seen_item,item) == 0)
3310 {
3311 seen_this_item = TRUE;
3312 break;
3313 }
3314
3315 if (seen_this_item)
3316 {
3317 DEBUG(D_receive)
3318 debug_printf("acl_smtp_dkim: skipping signer %s, "
3319 "already seen\n", item);
3320 continue;
3321 }
3322
3323 seen_items = string_append(seen_items, &seen_items_size,
3324 &seen_items_offset, 1, ":");
3325 }
3326
3327 seen_items = string_append(seen_items, &seen_items_size,
3328 &seen_items_offset, 1, item);
3329 seen_items[seen_items_offset] = '\0';
3330
3331 DEBUG(D_receive)
3332 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3333 item);
3334
3335 dkim_exim_acl_setup(item);
3336 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3337 &user_msg, &log_msg);
3338
3339 if (rc != OK)
3340 {
3341 DEBUG(D_receive)
3342 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3343 "skipping remaining items\n", rc, item);
3344 cancel_cutthrough_connection("dkim acl not ok");
3345 break;
3346 }
3347 }
3348 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3349 if (rc == DISCARD)
3350 {
3351 recipients_count = 0;
3352 blackholed_by = US"DKIM ACL";
3353 if (log_msg != NULL)
3354 blackhole_log_msg = string_sprintf(": %s", log_msg);
3355 }
3356 else if (rc != OK)
3357 {
3358 Uunlink(spool_name);
3359 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3360 smtp_yield = FALSE; /* No more messages after dropped connection */
3361 smtp_reply = US""; /* Indicate reply already sent */
3362 message_id[0] = 0; /* Indicate no message accepted */
3363 goto TIDYUP; /* Skip to end of function */
3364 }
3365 }
3366 }
3367 }
3368 #endif /* DISABLE_DKIM */
3369
3370 #ifdef WITH_CONTENT_SCAN
3371 if (recipients_count > 0 &&
3372 acl_smtp_mime != NULL &&
3373 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3374 goto TIDYUP;
3375 #endif /* WITH_CONTENT_SCAN */
3376
3377 #ifdef EXPERIMENTAL_DMARC
3378 dmarc_up = dmarc_store_data(from_header);
3379 #endif /* EXPERIMENTAL_DMARC */
3380
3381 #ifndef DISABLE_PRDR
3382 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3383 {
3384 unsigned int c;
3385 int all_pass = OK;
3386 int all_fail = FAIL;
3387
3388 smtp_printf("353 PRDR content analysis beginning\r\n");
3389 /* Loop through recipients, responses must be in same order received */
3390 for (c = 0; recipients_count > c; c++)
3391 {
3392 uschar * addr= recipients_list[c].address;
3393 uschar * msg= US"PRDR R=<%s> %s";
3394 uschar * code;
3395 DEBUG(D_receive)
3396 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3397 addr, c+1, recipients_count);
3398 rc = acl_check(ACL_WHERE_PRDR, addr,
3399 acl_smtp_data_prdr, &user_msg, &log_msg);
3400
3401 /* If any recipient rejected content, indicate it in final message */
3402 all_pass |= rc;
3403 /* If all recipients rejected, indicate in final message */
3404 all_fail &= rc;
3405
3406 switch (rc)
3407 {
3408 case OK: case DISCARD: code = US"250"; break;
3409 case DEFER: code = US"450"; break;
3410 default: code = US"550"; break;
3411 }
3412 if (user_msg != NULL)
3413 smtp_user_msg(code, user_msg);
3414 else
3415 {
3416 switch (rc)
3417 {
3418 case OK: case DISCARD:
3419 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3420 case DEFER:
3421 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3422 default:
3423 msg = string_sprintf(CS msg, addr, "refusal"); break;
3424 }
3425 smtp_user_msg(code, msg);
3426 }
3427 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3428 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3429 else log_write(0, LOG_MAIN, "%s", CS msg);
3430
3431 if (rc != OK) { receive_remove_recipient(addr); c--; }
3432 }
3433 /* Set up final message, used if data acl gives OK */
3434 smtp_reply = string_sprintf("%s id=%s message %s",
3435 all_fail == FAIL ? US"550" : US"250",
3436 message_id,
3437 all_fail == FAIL
3438 ? US"rejected for all recipients"
3439 : all_pass == OK
3440 ? US"accepted"
3441 : US"accepted for some recipients");
3442 if (recipients_count == 0)
3443 {
3444 message_id[0] = 0; /* Indicate no message accepted */
3445 goto TIDYUP;
3446 }
3447 }
3448 else
3449 prdr_requested = FALSE;
3450 #endif /* !DISABLE_PRDR */
3451
3452 /* Check the recipients count again, as the MIME ACL might have changed
3453 them. */
3454
3455 if (acl_smtp_data != NULL && recipients_count > 0)
3456 {
3457 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3458 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3459 if (rc == DISCARD)
3460 {
3461 recipients_count = 0;
3462 blackholed_by = US"DATA ACL";
3463 if (log_msg != NULL)
3464 blackhole_log_msg = string_sprintf(": %s", log_msg);
3465 cancel_cutthrough_connection("data acl discard");
3466 }
3467 else if (rc != OK)
3468 {
3469 Uunlink(spool_name);
3470 cancel_cutthrough_connection("data acl not ok");
3471 #ifdef WITH_CONTENT_SCAN
3472 unspool_mbox();
3473 #endif
3474 #ifdef EXPERIMENTAL_DCC
3475 dcc_ok = 0;
3476 #endif
3477 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3478 smtp_yield = FALSE; /* No more messages after dropped connection */
3479 smtp_reply = US""; /* Indicate reply already sent */
3480 message_id[0] = 0; /* Indicate no message accepted */
3481 goto TIDYUP; /* Skip to end of function */
3482 }
3483 }
3484 }
3485
3486 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3487 we cannot take different actions for permanent and temporary rejections. */
3488
3489 else
3490 {
3491
3492 #ifdef WITH_CONTENT_SCAN
3493 if (acl_not_smtp_mime != NULL &&
3494 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3495 &blackholed_by))
3496 goto TIDYUP;
3497 #endif /* WITH_CONTENT_SCAN */
3498
3499 if (acl_not_smtp != NULL)
3500 {
3501 uschar *user_msg, *log_msg;
3502 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3503 if (rc == DISCARD)
3504 {
3505 recipients_count = 0;
3506 blackholed_by = US"non-SMTP ACL";
3507 if (log_msg != NULL)
3508 blackhole_log_msg = string_sprintf(": %s", log_msg);
3509 }
3510 else if (rc != OK)
3511 {
3512 Uunlink(spool_name);
3513 #ifdef WITH_CONTENT_SCAN
3514 unspool_mbox();
3515 #endif
3516 #ifdef EXPERIMENTAL_DCC
3517 dcc_ok = 0;
3518 #endif
3519 /* The ACL can specify where rejections are to be logged, possibly
3520 nowhere. The default is main and reject logs. */
3521
3522 if (log_reject_target != 0)
3523 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3524 sender_address, log_msg);
3525
3526 if (user_msg == NULL) user_msg = US"local configuration problem";
3527 if (smtp_batched_input)
3528 {
3529 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3530 /* Does not return */
3531 }
3532 else
3533 {
3534 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3535 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3536 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3537 header_list);
3538 /* Does not return */
3539 }
3540 }
3541 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3542 }
3543 }
3544
3545 /* The applicable ACLs have been run */
3546
3547 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3548 if (queue_only_policy) queued_by = US"ACL";
3549 }
3550
3551 #ifdef WITH_CONTENT_SCAN
3552 unspool_mbox();
3553 #endif
3554
3555 #ifdef EXPERIMENTAL_DCC
3556 dcc_ok = 0;
3557 #endif
3558
3559
3560 /* The final check on the message is to run the scan_local() function. The
3561 version supplied with Exim always accepts, but this is a hook for sysadmins to
3562 supply their own checking code. The local_scan() function is run even when all
3563 the recipients have been discarded. */
3564
3565 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3566
3567 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3568 deleted, and the incident gets logged. */
3569
3570 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3571 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3572 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3573 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3574
3575 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3576 local_scan_timeout);
3577 local_scan_data = NULL;
3578
3579 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3580 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3581 rc = local_scan(data_fd, &local_scan_data);
3582 alarm(0);
3583 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3584
3585 enable_dollar_recipients = FALSE;
3586
3587 store_pool = POOL_MAIN; /* In case changed */
3588 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3589 local_scan_data);
3590
3591 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3592 os_non_restarting_signal(SIGFPE, SIG_DFL);
3593 os_non_restarting_signal(SIGILL, SIG_DFL);
3594 os_non_restarting_signal(SIGBUS, SIG_DFL);
3595
3596 /* The length check is paranoia against some runaway code, and also because
3597 (for a success return) lines in the spool file are read into big_buffer. */
3598
3599 if (local_scan_data != NULL)
3600 {
3601 int len = Ustrlen(local_scan_data);
3602 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3603 local_scan_data = string_copyn(local_scan_data, len);
3604 }
3605
3606 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3607 {
3608 if (!deliver_freeze) /* ACL might have already frozen */
3609 {
3610 deliver_freeze = TRUE;
3611 deliver_frozen_at = time(NULL);
3612 frozen_by = US"local_scan()";
3613 }
3614 rc = LOCAL_SCAN_ACCEPT;
3615 }
3616 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3617 {
3618 if (!queue_only_policy) /* ACL might have already queued */
3619 {
3620 queue_only_policy = TRUE;
3621 queued_by = US"local_scan()";
3622 }
3623 rc = LOCAL_SCAN_ACCEPT;
3624 }
3625
3626 /* Message accepted: remove newlines in local_scan_data because otherwise
3627 the spool file gets corrupted. Ensure that all recipients are qualified. */
3628
3629 if (rc == LOCAL_SCAN_ACCEPT)
3630 {
3631 if (local_scan_data != NULL)
3632 {
3633 uschar *s;
3634 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3635 }
3636 for (i = 0; i < recipients_count; i++)
3637 {
3638 recipient_item *r = recipients_list + i;
3639 r->address = rewrite_address_qualify(r->address, TRUE);
3640 if (r->errors_to != NULL)
3641 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3642 }
3643 if (recipients_count == 0 && blackholed_by == NULL)
3644 blackholed_by = US"local_scan";
3645 }
3646
3647 /* Message rejected: newlines permitted in local_scan_data to generate
3648 multiline SMTP responses. */
3649
3650 else
3651 {
3652 uschar *istemp = US"";
3653 uschar *s = NULL;
3654 uschar *smtp_code;
3655 int size = 0;
3656 int sptr = 0;
3657
3658 errmsg = local_scan_data;
3659
3660 Uunlink(spool_name); /* Cancel this message */
3661 switch(rc)
3662 {
3663 default:
3664 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3665 "rejection given", rc);
3666 goto TEMPREJECT;
3667
3668 case LOCAL_SCAN_REJECT_NOLOGHDR:
3669 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3670 /* Fall through */
3671
3672 case LOCAL_SCAN_REJECT:
3673 smtp_code = US"550";
3674 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3675 break;
3676
3677 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3678 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3679 /* Fall through */
3680
3681 case LOCAL_SCAN_TEMPREJECT:
3682 TEMPREJECT:
3683 smtp_code = US"451";
3684 if (errmsg == NULL) errmsg = US"Temporary local problem";
3685 istemp = US"temporarily ";
3686 break;
3687 }
3688
3689 s = string_append(s, &size, &sptr, 2, US"F=",
3690 (sender_address[0] == 0)? US"<>" : sender_address);
3691 s = add_host_info_for_log(s, &size, &sptr);
3692 s[sptr] = 0;
3693
3694 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3695 s, istemp, string_printing(errmsg));
3696
3697 if (smtp_input)
3698 {
3699 if (!smtp_batched_input)
3700 {
3701 smtp_respond(smtp_code, 3, TRUE, errmsg);
3702 message_id[0] = 0; /* Indicate no message accepted */
3703 smtp_reply = US""; /* Indicate reply already sent */
3704 goto TIDYUP; /* Skip to end of function */
3705 }
3706 else
3707 {
3708 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3709 /* Does not return */
3710 }
3711 }
3712 else
3713 {
3714 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3715 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3716 US"message rejected by local scan code: ", error_rc, data_file,
3717 header_list);
3718 /* Does not return */
3719 }
3720 }
3721
3722 /* Reset signal handlers to ignore signals that previously would have caused
3723 the message to be abandoned. */
3724
3725 signal(SIGTERM, SIG_IGN);
3726 signal(SIGINT, SIG_IGN);
3727
3728
3729 /* Ensure the first time flag is set in the newly-received message. */
3730
3731 deliver_firsttime = TRUE;
3732
3733 #ifdef EXPERIMENTAL_BRIGHTMAIL
3734 if (bmi_run == 1)
3735 { /* rewind data file */
3736 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3737 bmi_verdicts = bmi_process_message(header_list, data_fd);
3738 }
3739 #endif
3740
3741 /* Update the timestamp in our Received: header to account for any time taken by
3742 an ACL or by local_scan(). The new time is the time that all reception
3743 processing is complete. */
3744
3745 timestamp = expand_string(US"${tod_full}");
3746 tslen = Ustrlen(timestamp);
3747
3748 memcpy(received_header->text + received_header->slen - tslen - 1,
3749 timestamp, tslen);
3750
3751 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3752
3753 if (mua_wrapper)
3754 {
3755 deliver_freeze = FALSE;
3756 queue_only_policy = FALSE;
3757 }
3758
3759 /* Keep the data file open until we have written the header file, in order to
3760 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3761 don't write the header file, and we unlink the data file. If writing the header
3762 file fails, we have failed to accept this message. */
3763
3764 if (host_checking || blackholed_by != NULL)
3765 {
3766 header_line *h;
3767 Uunlink(spool_name);
3768 msg_size = 0; /* Compute size for log line */
3769 for (h = header_list; h != NULL; h = h->next)
3770 if (h->type != '*') msg_size += h->slen;
3771 }
3772
3773 /* Write the -H file */
3774
3775 else
3776 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3777 {
3778 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3779 Uunlink(spool_name); /* Lose the data file */
3780
3781 if (smtp_input)
3782 {
3783 smtp_reply = US"451 Error in writing spool file";
3784 message_id[0] = 0; /* Indicate no message accepted */
3785 goto TIDYUP;
3786 }
3787 else
3788 {
3789 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3790 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3791 header_list);
3792 /* Does not return */
3793 }
3794 }
3795
3796
3797 /* The message has now been successfully received. */
3798
3799 receive_messagecount++;
3800
3801 /* In SMTP sessions we may receive several in one connection. After each one,
3802 we wait for the clock to tick at the level of message-id granularity. This is
3803 so that the combination of time+pid is unique, even on systems where the pid
3804 can be re-used within our time interval. We can't shorten the interval without
3805 re-designing the message-id. See comments above where the message id is
3806 created. This is Something For The Future. */
3807
3808 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3809 exim_wait_tick(&message_id_tv, id_resolution);
3810
3811 /* Add data size to written header size. We do not count the initial file name
3812 that is in the file, but we do add one extra for the notional blank line that
3813 precedes the data. This total differs from message_size in that it include the
3814 added Received: header and any other headers that got created locally. */
3815
3816 fflush(data_file);
3817 fstat(data_fd, &statbuf);
3818
3819 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3820
3821 /* Generate a "message received" log entry. We do this by building up a dynamic
3822 string as required. Since we commonly want to add two items at a time, use a
3823 macro to simplify the coding. We log the arrival of a new message while the
3824 file is still locked, just in case the machine is *really* fast, and delivers
3825 it first! Include any message id that is in the message - since the syntax of a
3826 message id is actually an addr-spec, we can use the parse routine to canonicalize
3827 it. */
3828
3829 size = 256;
3830 sptr = 0;
3831 s = store_get(size);
3832
3833 s = string_append(s, &size, &sptr, 2,
3834 fake_response == FAIL ? US"(= " : US"<= ",
3835 sender_address[0] == 0 ? US"<>" : sender_address);
3836 if (message_reference)
3837 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3838
3839 s = add_host_info_for_log(s, &size, &sptr);
3840
3841 #ifdef SUPPORT_TLS
3842 if (LOGGING(tls_cipher) && tls_in.cipher)
3843 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3844 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3845 s = string_append(s, &size, &sptr, 2, US" CV=",
3846 tls_in.certificate_verified ? "yes":"no");
3847 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3848 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3849 string_printing(tls_in.peerdn), US"\"");
3850 if (LOGGING(tls_sni) && tls_in.sni)
3851 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3852 string_printing(tls_in.sni), US"\"");
3853 #endif
3854
3855 if (sender_host_authenticated)
3856 {
3857 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3858 if (authenticated_id)
3859 {
3860 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3861 if (LOGGING(smtp_mailauth) && authenticated_sender)
3862 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3863 }
3864 }
3865
3866 #ifndef DISABLE_PRDR
3867 if (prdr_requested)
3868 s = string_catn(s, &size, &sptr, US" PRDR", 5);
3869 #endif
3870
3871 #ifdef SUPPORT_PROXY
3872 if (proxy_session && LOGGING(proxy))
3873 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3874 #endif
3875
3876 if (chunking_state > CHUNKING_OFFERED)
3877 s = string_catn(s, &size, &sptr, US" K", 2);
3878
3879 sprintf(CS big_buffer, "%d", msg_size);
3880 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3881
3882 /* log 8BITMIME mode announced in MAIL_FROM
3883 0 ... no BODY= used
3884 7 ... 7BIT
3885 8 ... 8BITMIME */
3886 if (LOGGING(8bitmime))
3887 {
3888 sprintf(CS big_buffer, "%d", body_8bitmime);
3889 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3890 }
3891
3892 if (*queue_name)
3893 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
3894
3895 /* If an addr-spec in a message-id contains a quoted string, it can contain
3896 any characters except " \ and CR and so in particular it can contain NL!
3897 Therefore, make sure we use a printing-characters only version for the log.
3898 Also, allow for domain literals in the message id. */
3899
3900 if (msgid_header)
3901 {
3902 uschar *old_id;
3903 BOOL save_allow_domain_literals = allow_domain_literals;
3904 allow_domain_literals = TRUE;
3905 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3906 &errmsg, &start, &end, &domain, FALSE);
3907 allow_domain_literals = save_allow_domain_literals;
3908 if (old_id != NULL)
3909 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3910 }
3911
3912 /* If subject logging is turned on, create suitable printing-character
3913 text. By expanding $h_subject: we make use of the MIME decoding. */
3914
3915 if (LOGGING(subject) && subject_header != NULL)
3916 {
3917 int i;
3918 uschar *p = big_buffer;
3919 uschar *ss = expand_string(US"$h_subject:");
3920
3921 /* Backslash-quote any double quotes or backslashes so as to make a
3922 a C-like string, and turn any non-printers into escape sequences. */
3923
3924 *p++ = '\"';
3925 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3926 {
3927 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3928 *p++ = ss[i];
3929 }
3930 *p++ = '\"';
3931 *p = 0;
3932 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3933 }
3934
3935 /* Terminate the string: string_cat() and string_append() leave room, but do
3936 not put the zero in. */
3937
3938 s[sptr] = 0;
3939
3940 /* Create a message log file if message logs are being used and this message is
3941 not blackholed. Write the reception stuff to it. We used to leave message log
3942 creation until the first delivery, but this has proved confusing for some
3943 people. */
3944
3945 if (message_logs && blackholed_by == NULL)
3946 {
3947 int fd;
3948
3949 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
3950
3951 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
3952 && errno == ENOENT
3953 )
3954 {
3955 (void)directory_make(spool_directory,
3956 spool_sname(US"msglog", message_subdir),
3957 MSGLOG_DIRECTORY_MODE, TRUE);
3958 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3959 }
3960
3961 if (fd < 0)
3962 {
3963 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3964 spool_name, strerror(errno));
3965 }
3966
3967 else
3968 {
3969 FILE *message_log = fdopen(fd, "a");
3970 if (message_log == NULL)
3971 {
3972 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3973 spool_name, strerror(errno));
3974 (void)close(fd);
3975 }
3976 else
3977 {
3978 uschar *now = tod_stamp(tod_log);
3979 fprintf(message_log, "%s Received from %s\n", now, s+3);
3980 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3981 frozen_by);
3982 if (queue_only_policy) fprintf(message_log,
3983 "%s no immediate delivery: queued%s%s by %s\n", now,
3984 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
3985 queued_by);
3986 (void)fclose(message_log);
3987 }
3988 }
3989 }
3990
3991 /* Everything has now been done for a successful message except logging its
3992 arrival, and outputting an SMTP response. While writing to the log, set a flag
3993 to cause a call to receive_bomb_out() if the log cannot be opened. */
3994
3995 receive_call_bombout = TRUE;
3996
3997 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3998 connection has gone away. This can only be done if there is no unconsumed input
3999 waiting in the local input buffer. We can test for this by calling
4000 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4001 input to be sent following the final dot, so the presence of following input is
4002 not an error.
4003
4004 If the connection is still present, but there is no unread input for the
4005 socket, the result of a select() call will be zero. If, however, the connection
4006 has gone away, or if there is pending input, the result of select() will be
4007 non-zero. The two cases can be distinguished by trying to read the next input
4008 character. If we succeed, we can unread it so that it remains in the local
4009 buffer for handling later. If not, the connection has been lost.
4010
4011 Of course, since TCP/IP is asynchronous, there is always a chance that the
4012 connection will vanish between the time of this test and the sending of the
4013 response, but the chance of this happening should be small. */
4014
4015 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4016 !receive_smtp_buffered())
4017 {
4018 struct timeval tv;
4019 fd_set select_check;
4020 FD_ZERO(&select_check);
4021 FD_SET(fileno(smtp_in), &select_check);
4022 tv.tv_sec = 0;
4023 tv.tv_usec = 0;
4024
4025 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4026 {
4027 int c = (receive_getc)();
4028 if (c != EOF) (receive_ungetc)(c); else
4029 {
4030 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4031 smtp_reply = US""; /* No attempt to send a response */
4032 smtp_yield = FALSE; /* Nothing more on this connection */
4033
4034 /* Re-use the log line workspace */
4035
4036 sptr = 0;
4037 s = string_cat(s, &size, &sptr, US"SMTP connection lost after final dot");
4038 s = add_host_info_for_log(s, &size, &sptr);
4039 s[sptr] = 0;
4040 log_write(0, LOG_MAIN, "%s", s);
4041
4042 /* Delete the files for this aborted message. */
4043
4044 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4045 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4046 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4047
4048 goto TIDYUP;
4049 }
4050 }
4051 }
4052
4053 /* The connection has not gone away; we really are going to take responsibility
4054 for this message. */
4055
4056 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4057 data onward by now.
4058
4059 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4060 the sender's dot (below).
4061 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4062 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4063 in which case pass temp-reject back to initiator and dump the files.
4064
4065 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4066
4067 XXX We do not handle queue-only, freezing, or blackholes.
4068 */
4069 if(cutthrough.fd >= 0)
4070 {
4071 uschar * msg=