64a8d511ca46637efc9bf58441fb8bfa329ca380
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 /* Code for receiving a message and setting up spool files. */
9
10 #include "exim.h"
11
12 #ifdef EXPERIMENTAL_DCC
13 extern int dcc_ok;
14 #endif
15
16 #ifdef EXPERIMENTAL_DMARC
17 # include "dmarc.h"
18 #endif /* EXPERIMENTAL_DMARC */
19
20 /*************************************************
21 * Local static variables *
22 *************************************************/
23
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
27
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
29
30
31 /*************************************************
32 * Non-SMTP character reading functions *
33 *************************************************/
34
35 /* These are the default functions that are set up in the variables such as
36 receive_getc initially. They just call the standard functions, passing stdin as
37 the file. (When SMTP input is occurring, different functions are used by
38 changing the pointer variables.) */
39
40 int
41 stdin_getc(unsigned lim)
42 {
43 return getc(stdin);
44 }
45
46 int
47 stdin_ungetc(int c)
48 {
49 return ungetc(c, stdin);
50 }
51
52 int
53 stdin_feof(void)
54 {
55 return feof(stdin);
56 }
57
58 int
59 stdin_ferror(void)
60 {
61 return ferror(stdin);
62 }
63
64
65
66
67 /*************************************************
68 * Check that a set sender is allowed *
69 *************************************************/
70
71 /* This function is called when a local caller sets an explicit sender address.
72 It checks whether this is permitted, which it is for trusted callers.
73 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74
75 Arguments: the proposed sender address
76 Returns: TRUE for a trusted caller
77 TRUE if the address has been set, untrusted_set_sender has been
78 set, and the address matches something in the list
79 FALSE otherwise
80 */
81
82 BOOL
83 receive_check_set_sender(uschar *newsender)
84 {
85 uschar *qnewsender;
86 if (trusted_caller) return TRUE;
87 if (!newsender || !untrusted_set_sender) return FALSE;
88 qnewsender = Ustrchr(newsender, '@')
89 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
91 }
92
93
94
95
96 /*************************************************
97 * Read space info for a partition *
98 *************************************************/
99
100 /* This function is called by receive_check_fs() below, and also by string
101 expansion for variables such as $spool_space. The field names for the statvfs
102 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
103 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
104 have inodes, and they return -1 for the number available.
105
106 Later: It turns out that some file systems that do not have the concept of
107 inodes return 0 rather than -1. Such systems should also return 0 for the total
108 number of inodes, so we require that to be greater than zero before returning
109 an inode count.
110
111 Arguments:
112 isspool TRUE for spool partition, FALSE for log partition
113 inodeptr address of int to receive inode count; -1 if there isn't one
114
115 Returns: available on-root space, in kilobytes
116 -1 for log partition if there isn't one
117
118 All values are -1 if the STATFS functions are not available.
119 */
120
121 int
122 receive_statvfs(BOOL isspool, int *inodeptr)
123 {
124 #ifdef HAVE_STATFS
125 struct STATVFS statbuf;
126 struct stat dummy;
127 uschar *path;
128 uschar *name;
129 uschar buffer[1024];
130
131 /* The spool directory must always exist. */
132
133 if (isspool)
134 {
135 path = spool_directory;
136 name = US"spool";
137 }
138
139 /* Need to cut down the log file path to the directory, and to ignore any
140 appearance of "syslog" in it. */
141
142 else
143 {
144 int sep = ':'; /* Not variable - outside scripts use */
145 const uschar *p = log_file_path;
146 name = US"log";
147
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
150
151 if (*p == 0) p = US":";
152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
153 if (Ustrcmp(path, "syslog") != 0)
154 break;
155
156 if (path == NULL) /* No log files */
157 {
158 *inodeptr = -1;
159 return -1;
160 }
161
162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
164 subdirectory has been symbolically linked elsewhere. */
165
166 if (path[0] == 0)
167 {
168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
169 path = buffer;
170 }
171 else
172 {
173 uschar *cp;
174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
175 }
176 }
177
178 /* We now have the path; do the business */
179
180 memset(&statbuf, 0, sizeof(statbuf));
181
182 if (STATVFS(CS path, &statbuf) != 0)
183 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
184 { /* Can happen on first run after installation */
185 *inodeptr = -1;
186 return -1;
187 }
188 else
189 {
190 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
191 "%s directory %s: %s", name, path, strerror(errno));
192 smtp_closedown(US"spool or log directory problem");
193 exim_exit(EXIT_FAILURE);
194 }
195
196 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
197
198 /* Disks are getting huge. Take care with computing the size in kilobytes. */
199
200 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
201
202 #else
203 /* Unable to find partition sizes in this environment. */
204
205 *inodeptr = -1;
206 return -1;
207 #endif
208 }
209
210
211
212
213 /*************************************************
214 * Check space on spool and log partitions *
215 *************************************************/
216
217 /* This function is called before accepting a message; if any thresholds are
218 set, it checks them. If a message_size is supplied, it checks that there is
219 enough space for that size plus the threshold - i.e. that the message won't
220 reduce the space to the threshold. Not all OS have statvfs(); for those that
221 don't, this function always returns TRUE. For some OS the old function and
222 struct name statfs is used; that is handled by a macro, defined in exim.h.
223
224 Arguments:
225 msg_size the (estimated) size of an incoming message
226
227 Returns: FALSE if there isn't enough space, or if the information cannot
228 be obtained
229 TRUE if no check was done or there is enough space
230 */
231
232 BOOL
233 receive_check_fs(int msg_size)
234 {
235 int space, inodes;
236
237 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
238 {
239 space = receive_statvfs(TRUE, &inodes);
240
241 DEBUG(D_receive)
242 debug_printf("spool directory space = %dK inodes = %d "
243 "check_space = %dK inodes = %d msg_size = %d\n",
244 space, inodes, check_spool_space, check_spool_inodes, msg_size);
245
246 if ((space >= 0 && space < check_spool_space) ||
247 (inodes >= 0 && inodes < check_spool_inodes))
248 {
249 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
250 "inodes=%d", space, inodes);
251 return FALSE;
252 }
253 }
254
255 if (check_log_space > 0 || check_log_inodes > 0)
256 {
257 space = receive_statvfs(FALSE, &inodes);
258
259 DEBUG(D_receive)
260 debug_printf("log directory space = %dK inodes = %d "
261 "check_space = %dK inodes = %d\n",
262 space, inodes, check_log_space, check_log_inodes);
263
264 if ((space >= 0 && space < check_log_space) ||
265 (inodes >= 0 && inodes < check_log_inodes))
266 {
267 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
268 "inodes=%d", space, inodes);
269 return FALSE;
270 }
271 }
272
273 return TRUE;
274 }
275
276
277
278 /*************************************************
279 * Bomb out while reading a message *
280 *************************************************/
281
282 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
283 received, or if there is a timeout. A rarer case might be if the log files are
284 screwed up and Exim can't open them to record a message's arrival. Handling
285 that case is done by setting a flag to cause the log functions to call this
286 function if there is an ultimate disaster. That is why it is globally
287 accessible.
288
289 Arguments:
290 reason text reason to pass to the not-quit ACL
291 msg default SMTP response to give if in an SMTP session
292 Returns: it doesn't
293 */
294
295 void
296 receive_bomb_out(uschar *reason, uschar *msg)
297 {
298 static BOOL already_bombing_out;
299 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
300 timeouts, if someone has something slow in their quit ACL. Since the only
301 things we should be doing are to close down cleanly ASAP, on the second
302 pass we also close down stuff that might be opened again, before bypassing
303 the ACL call and exiting. */
304
305 /* If spool_name is set, it contains the name of the data file that is being
306 written. Unlink it before closing so that it cannot be picked up by a delivery
307 process. Ensure that any header file is also removed. */
308
309 if (spool_name[0] != '\0')
310 {
311 Uunlink(spool_name);
312 spool_name[Ustrlen(spool_name) - 1] = 'H';
313 Uunlink(spool_name);
314 spool_name[0] = '\0';
315 }
316
317 /* Now close the file if it is open, either as a fd or a stream. */
318
319 if (data_file != NULL)
320 {
321 (void)fclose(data_file);
322 data_file = NULL;
323 } else if (data_fd >= 0) {
324 (void)close(data_fd);
325 data_fd = -1;
326 }
327
328 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
329 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
330 SMTP response. */
331
332 if (!already_bombing_out)
333 {
334 already_bombing_out = TRUE;
335 if (smtp_input)
336 {
337 if (smtp_batched_input)
338 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
339 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
340 smtp_active_hostname, msg);
341 }
342 }
343
344 /* Exit from the program (non-BSMTP cases) */
345
346 exim_exit(EXIT_FAILURE);
347 }
348
349
350 /*************************************************
351 * Data read timeout *
352 *************************************************/
353
354 /* Handler function for timeouts that occur while reading the data that
355 comprises a message.
356
357 Argument: the signal number
358 Returns: nothing
359 */
360
361 static void
362 data_timeout_handler(int sig)
363 {
364 uschar *msg = NULL;
365
366 sig = sig; /* Keep picky compilers happy */
367
368 if (smtp_input)
369 {
370 msg = US"SMTP incoming data timeout";
371 log_write(L_lost_incoming_connection,
372 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
373 "from %s F=<%s>",
374 (sender_fullhost != NULL)? sender_fullhost : US"local process",
375 sender_address);
376 }
377 else
378 {
379 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
380 log_write(L_lost_incoming_connection,
381 LOG_MAIN, "timed out while reading local message");
382 }
383
384 receive_bomb_out(US"data-timeout", msg); /* Does not return */
385 }
386
387
388
389 /*************************************************
390 * local_scan() timeout *
391 *************************************************/
392
393 /* Handler function for timeouts that occur while running a local_scan()
394 function.
395
396 Argument: the signal number
397 Returns: nothing
398 */
399
400 static void
401 local_scan_timeout_handler(int sig)
402 {
403 sig = sig; /* Keep picky compilers happy */
404 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
405 "message temporarily rejected (size %d)", message_size);
406 /* Does not return */
407 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
408 }
409
410
411
412 /*************************************************
413 * local_scan() crashed *
414 *************************************************/
415
416 /* Handler function for signals that occur while running a local_scan()
417 function.
418
419 Argument: the signal number
420 Returns: nothing
421 */
422
423 static void
424 local_scan_crash_handler(int sig)
425 {
426 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
427 "signal %d - message temporarily rejected (size %d)", sig, message_size);
428 /* Does not return */
429 receive_bomb_out(US"local-scan-error", US"local verification problem");
430 }
431
432
433 /*************************************************
434 * SIGTERM or SIGINT received *
435 *************************************************/
436
437 /* Handler for SIGTERM or SIGINT signals that occur while reading the
438 data that comprises a message.
439
440 Argument: the signal number
441 Returns: nothing
442 */
443
444 static void
445 data_sigterm_sigint_handler(int sig)
446 {
447 uschar *msg = NULL;
448
449 if (smtp_input)
450 {
451 msg = US"Service not available - SIGTERM or SIGINT received";
452 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
453 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
454 }
455 else
456 {
457 if (filter_test == FTEST_NONE)
458 {
459 fprintf(stderr, "\nexim: %s received - message abandoned\n",
460 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
461 log_write(0, LOG_MAIN, "%s received while reading local message",
462 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
463 }
464 }
465
466 receive_bomb_out(US"signal-exit", msg); /* Does not return */
467 }
468
469
470
471 /*************************************************
472 * Add new recipient to list *
473 *************************************************/
474
475 /* This function builds a list of recipient addresses in argc/argv
476 format.
477
478 Arguments:
479 recipient the next address to add to recipients_list
480 pno parent number for fixed aliases; -1 otherwise
481
482 Returns: nothing
483 */
484
485 void
486 receive_add_recipient(uschar *recipient, int pno)
487 {
488 if (recipients_count >= recipients_list_max)
489 {
490 recipient_item *oldlist = recipients_list;
491 int oldmax = recipients_list_max;
492 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
493 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
494 if (oldlist != NULL)
495 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
496 }
497
498 recipients_list[recipients_count].address = recipient;
499 recipients_list[recipients_count].pno = pno;
500 #ifdef EXPERIMENTAL_BRIGHTMAIL
501 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
502 /* reset optin string pointer for next recipient */
503 bmi_current_optin = NULL;
504 #endif
505 recipients_list[recipients_count].orcpt = NULL;
506 recipients_list[recipients_count].dsn_flags = 0;
507 recipients_list[recipients_count++].errors_to = NULL;
508 }
509
510
511
512
513 /*************************************************
514 * Send user response message *
515 *************************************************/
516
517 /* This function is passed a default response code and a user message. It calls
518 smtp_message_code() to check and possibly modify the response code, and then
519 calls smtp_respond() to transmit the response. I put this into a function
520 just to avoid a lot of repetition.
521
522 Arguments:
523 code the response code
524 user_msg the user message
525
526 Returns: nothing
527 */
528
529 #ifndef DISABLE_PRDR
530 static void
531 smtp_user_msg(uschar *code, uschar *user_msg)
532 {
533 int len = 3;
534 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
535 smtp_respond(code, len, TRUE, user_msg);
536 }
537 #endif
538
539
540
541
542
543 /*************************************************
544 * Remove a recipient from the list *
545 *************************************************/
546
547 /* This function is provided for local_scan() to use.
548
549 Argument:
550 recipient address to remove
551
552 Returns: TRUE if it did remove something; FALSE otherwise
553 */
554
555 BOOL
556 receive_remove_recipient(uschar *recipient)
557 {
558 int count;
559 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
560 recipient);
561 for (count = 0; count < recipients_count; count++)
562 {
563 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
564 {
565 if ((--recipients_count - count) > 0)
566 memmove(recipients_list + count, recipients_list + count + 1,
567 (recipients_count - count)*sizeof(recipient_item));
568 return TRUE;
569 }
570 }
571 return FALSE;
572 }
573
574
575
576
577
578 /*************************************************
579 * Read data portion of a non-SMTP message *
580 *************************************************/
581
582 /* This function is called to read the remainder of a message (following the
583 header) when the input is not from SMTP - we are receiving a local message on
584 a standard input stream. The message is always terminated by EOF, and is also
585 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
586 two cases for maximum efficiency.
587
588 Ensure that the body ends with a newline. This will naturally be the case when
589 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
590 as "sequences of lines" - this of course strictly applies only to SMTP, but
591 deliveries into BSD-type mailbox files also require it. Exim used to have a
592 flag for doing this at delivery time, but as it was always set for all
593 transports, I decided to simplify things by putting the check here instead.
594
595 There is at least one MUA (dtmail) that sends CRLF via this interface, and
596 other programs are known to do this as well. Exim used to have a option for
597 dealing with this: in July 2003, after much discussion, the code has been
598 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
599
600 However, for the case when a dot on a line by itself terminates a message, the
601 only recognized terminating sequences before and after the dot are LF and CRLF.
602 Otherwise, having read EOL . CR, you don't know whether to read another
603 character or not.
604
605 Internally, in messages stored in Exim's spool files, LF is used as the line
606 terminator. Under the new regime, bare CRs will no longer appear in these
607 files.
608
609 Arguments:
610 fout a FILE to which to write the message
611
612 Returns: One of the END_xxx values indicating why it stopped reading
613 */
614
615 static int
616 read_message_data(FILE *fout)
617 {
618 int ch_state;
619 register int ch;
620 register int linelength = 0;
621
622 /* Handle the case when only EOF terminates the message */
623
624 if (!dot_ends)
625 {
626 register int last_ch = '\n';
627
628 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
629 {
630 if (ch == 0) body_zerocount++;
631 if (last_ch == '\r' && ch != '\n')
632 {
633 if (linelength > max_received_linelength)
634 max_received_linelength = linelength;
635 linelength = 0;
636 if (fputc('\n', fout) == EOF) return END_WERROR;
637 message_size++;
638 body_linecount++;
639 }
640 if (ch == '\r') continue;
641
642 if (fputc(ch, fout) == EOF) return END_WERROR;
643 if (ch == '\n')
644 {
645 if (linelength > max_received_linelength)
646 max_received_linelength = linelength;
647 linelength = 0;
648 body_linecount++;
649 }
650 else linelength++;
651 if (++message_size > thismessage_size_limit) return END_SIZE;
652 }
653
654 if (last_ch != '\n')
655 {
656 if (linelength > max_received_linelength)
657 max_received_linelength = linelength;
658 if (fputc('\n', fout) == EOF) return END_WERROR;
659 message_size++;
660 body_linecount++;
661 }
662
663 return END_EOF;
664 }
665
666 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
667
668 ch_state = 1;
669
670 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
671 {
672 if (ch == 0) body_zerocount++;
673 switch (ch_state)
674 {
675 case 0: /* Normal state (previous char written) */
676 if (ch == '\n')
677 {
678 body_linecount++;
679 if (linelength > max_received_linelength)
680 max_received_linelength = linelength;
681 linelength = -1;
682 ch_state = 1;
683 }
684 else if (ch == '\r')
685 { ch_state = 2; continue; }
686 break;
687
688 case 1: /* After written "\n" */
689 if (ch == '.') { ch_state = 3; continue; }
690 if (ch == '\r') { ch_state = 2; continue; }
691 if (ch == '\n') { body_linecount++; linelength = -1; }
692 else ch_state = 0;
693 break;
694
695 case 2:
696 body_linecount++; /* After unwritten "\r" */
697 if (linelength > max_received_linelength)
698 max_received_linelength = linelength;
699 if (ch == '\n')
700 {
701 ch_state = 1;
702 linelength = -1;
703 }
704 else
705 {
706 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
707 if (ch == '\r') continue;
708 ch_state = 0;
709 linelength = 0;
710 }
711 break;
712
713 case 3: /* After "\n." (\n written, dot not) */
714 if (ch == '\n') return END_DOT;
715 if (ch == '\r') { ch_state = 4; continue; }
716 message_size++;
717 linelength++;
718 if (fputc('.', fout) == EOF) return END_WERROR;
719 ch_state = 0;
720 break;
721
722 case 4: /* After "\n.\r" (\n written, rest not) */
723 if (ch == '\n') return END_DOT;
724 message_size += 2;
725 body_linecount++;
726 if (fputs(".\n", fout) == EOF) return END_WERROR;
727 if (ch == '\r') { ch_state = 2; continue; }
728 ch_state = 0;
729 break;
730 }
731
732 linelength++;
733 if (fputc(ch, fout) == EOF) return END_WERROR;
734 if (++message_size > thismessage_size_limit) return END_SIZE;
735 }
736
737 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
738 the message ends with a newline, and we must also write any characters that
739 were saved up while testing for an ending dot. */
740
741 if (ch_state != 1)
742 {
743 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
744 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
745 message_size += Ustrlen(ends[ch_state]);
746 body_linecount++;
747 }
748
749 return END_EOF;
750 }
751
752
753
754
755 /*************************************************
756 * Read data portion of an SMTP message *
757 *************************************************/
758
759 /* This function is called to read the remainder of an SMTP message (after the
760 headers), or to skip over it when an error has occurred. In this case, the
761 output file is passed as NULL.
762
763 If any line begins with a dot, that character is skipped. The input should only
764 be successfully terminated by CR LF . CR LF unless it is local (non-network)
765 SMTP, in which case the CRs are optional, but...
766
767 FUDGE: It seems that sites on the net send out messages with just LF
768 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
769 we make the CRs optional in all cases.
770
771 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
772 well, so that there are no CRs in spooled messages. However, the message
773 terminating dot is not recognized between two bare CRs.
774
775 Arguments:
776 fout a FILE to which to write the message; NULL if skipping
777
778 Returns: One of the END_xxx values indicating why it stopped reading
779 */
780
781 static int
782 read_message_data_smtp(FILE *fout)
783 {
784 int ch_state = 0;
785 int ch;
786 int linelength = 0;
787
788 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
789 {
790 if (ch == 0) body_zerocount++;
791 switch (ch_state)
792 {
793 case 0: /* After LF or CRLF */
794 if (ch == '.')
795 {
796 ch_state = 3;
797 continue; /* Don't ever write . after LF */
798 }
799 ch_state = 1;
800
801 /* Else fall through to handle as normal uschar. */
802
803 case 1: /* Normal state */
804 if (ch == '\n')
805 {
806 ch_state = 0;
807 body_linecount++;
808 if (linelength > max_received_linelength)
809 max_received_linelength = linelength;
810 linelength = -1;
811 }
812 else if (ch == '\r')
813 {
814 ch_state = 2;
815 continue;
816 }
817 break;
818
819 case 2: /* After (unwritten) CR */
820 body_linecount++;
821 if (linelength > max_received_linelength)
822 max_received_linelength = linelength;
823 linelength = -1;
824 if (ch == '\n')
825 {
826 ch_state = 0;
827 }
828 else
829 {
830 message_size++;
831 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
832 cutthrough_data_put_nl();
833 if (ch != '\r') ch_state = 1; else continue;
834 }
835 break;
836
837 case 3: /* After [CR] LF . */
838 if (ch == '\n')
839 return END_DOT;
840 if (ch == '\r')
841 {
842 ch_state = 4;
843 continue;
844 }
845 /* The dot was removed at state 3. For a doubled dot, here, reinstate
846 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
847 and to file below. */
848 if (ch == '.')
849 {
850 uschar c= ch;
851 cutthrough_data_puts(&c, 1);
852 }
853 ch_state = 1;
854 break;
855
856 case 4: /* After [CR] LF . CR */
857 if (ch == '\n') return END_DOT;
858 message_size++;
859 body_linecount++;
860 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
861 cutthrough_data_put_nl();
862 if (ch == '\r')
863 {
864 ch_state = 2;
865 continue;
866 }
867 ch_state = 1;
868 break;
869 }
870
871 /* Add the character to the spool file, unless skipping; then loop for the
872 next. */
873
874 message_size++;
875 linelength++;
876 if (fout)
877 {
878 if (fputc(ch, fout) == EOF) return END_WERROR;
879 if (message_size > thismessage_size_limit) return END_SIZE;
880 }
881 if(ch == '\n')
882 cutthrough_data_put_nl();
883 else
884 {
885 uschar c = ch;
886 cutthrough_data_puts(&c, 1);
887 }
888 }
889
890 /* Fall through here if EOF encountered. This indicates some kind of error,
891 since a correct message is terminated by [CR] LF . [CR] LF. */
892
893 return END_EOF;
894 }
895
896
897
898
899 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
900 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
901 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
902 body_linecount accounting for proper re-expansion for the wire, so use
903 a cut-down version of the state-machine above; we don't need to do leading-dot
904 detection and unstuffing.
905
906 Arguments:
907 fout a FILE to which to write the message; NULL if skipping;
908 must be open for both writing and reading.
909
910 Returns: One of the END_xxx values indicating why it stopped reading
911 */
912
913 static int
914 read_message_bdat_smtp(FILE *fout)
915 {
916 int linelength = 0, ch;
917 enum CH_STATE ch_state = LF_SEEN;
918 BOOL fix_nl = FALSE;
919
920 for(;;)
921 {
922 switch ((ch = (bdat_getc)(GETC_BUFFER_UNLIMITED)))
923 {
924 case EOF: return END_EOF;
925 case ERR: return END_PROTOCOL;
926 case EOD:
927 /* Nothing to get from the sender anymore. We check the last
928 character written to the spool.
929
930 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
931 If we would be strict, we would refuse such broken messages.
932 But we are liberal, so we fix it. It would be easy just to append
933 the "\n" to the spool.
934
935 But there are some more things (line counting, message size calculation and such),
936 that would need to be duplicated here. So we simply do some ungetc
937 trickery.
938 */
939 if (fout)
940 {
941 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
942 if (fgetc(fout) == '\n') return END_DOT;
943 }
944
945 if (linelength == -1) /* \r already seen (see below) */
946 {
947 DEBUG(D_receive) debug_printf("Add missing LF\n");
948 bdat_ungetc('\n');
949 continue;
950 }
951 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
952 bdat_ungetc('\r'); /* not even \r was seen */
953 fix_nl = TRUE;
954
955 continue;
956 case '\0': body_zerocount++; break;
957 }
958 switch (ch_state)
959 {
960 case LF_SEEN: /* After LF or CRLF */
961 ch_state = MID_LINE;
962 /* fall through to handle as normal uschar. */
963
964 case MID_LINE: /* Mid-line state */
965 if (ch == '\n')
966 {
967 ch_state = LF_SEEN;
968 body_linecount++;
969 if (linelength > max_received_linelength)
970 max_received_linelength = linelength;
971 linelength = -1;
972 }
973 else if (ch == '\r')
974 {
975 ch_state = CR_SEEN;
976 if (fix_nl) bdat_ungetc('\n');
977 continue; /* don't write CR */
978 }
979 break;
980
981 case CR_SEEN: /* After (unwritten) CR */
982 body_linecount++;
983 if (linelength > max_received_linelength)
984 max_received_linelength = linelength;
985 linelength = -1;
986 if (ch == '\n')
987 ch_state = LF_SEEN;
988 else
989 {
990 message_size++;
991 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
992 cutthrough_data_put_nl();
993 if (ch == '\r') continue; /* don't write CR */
994 ch_state = MID_LINE;
995 }
996 break;
997 }
998
999 /* Add the character to the spool file, unless skipping */
1000
1001 message_size++;
1002 linelength++;
1003 if (fout)
1004 {
1005 if (fputc(ch, fout) == EOF) return END_WERROR;
1006 if (message_size > thismessage_size_limit) return END_SIZE;
1007 }
1008 if(ch == '\n')
1009 cutthrough_data_put_nl();
1010 else
1011 {
1012 uschar c = ch;
1013 cutthrough_data_puts(&c, 1);
1014 }
1015 }
1016 /*NOTREACHED*/
1017 }
1018
1019
1020
1021
1022 /*************************************************
1023 * Swallow SMTP message *
1024 *************************************************/
1025
1026 /* This function is called when there has been some kind of error while reading
1027 an SMTP message, and the remaining data may need to be swallowed. It is global
1028 because it is called from smtp_closedown() to shut down an incoming call
1029 tidily.
1030
1031 Argument: a FILE from which to read the message
1032 Returns: nothing
1033 */
1034
1035 void
1036 receive_swallow_smtp(void)
1037 {
1038 /*XXX CHUNKING: not enough. read chunks until RSET? */
1039 if (message_ended >= END_NOTENDED)
1040 message_ended = read_message_data_smtp(NULL);
1041 }
1042
1043
1044
1045 /*************************************************
1046 * Handle lost SMTP connection *
1047 *************************************************/
1048
1049 /* This function logs connection loss incidents and generates an appropriate
1050 SMTP response.
1051
1052 Argument: additional data for the message
1053 Returns: the SMTP response
1054 */
1055
1056 static uschar *
1057 handle_lost_connection(uschar *s)
1058 {
1059 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1060 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1061 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1062 return US"421 Lost incoming connection";
1063 }
1064
1065
1066
1067
1068 /*************************************************
1069 * Handle a non-smtp reception error *
1070 *************************************************/
1071
1072 /* This function is called for various errors during the reception of non-SMTP
1073 messages. It either sends a message to the sender of the problem message, or it
1074 writes to the standard error stream.
1075
1076 Arguments:
1077 errcode code for moan_to_sender(), identifying the error
1078 text1 first message text, passed to moan_to_sender()
1079 text2 second message text, used only for stderrr
1080 error_rc code to pass to exim_exit if no problem
1081 f FILE containing body of message (may be stdin)
1082 hptr pointer to instore headers or NULL
1083
1084 Returns: calls exim_exit(), which does not return
1085 */
1086
1087 static void
1088 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1089 FILE *f, header_line *hptr)
1090 {
1091 if (error_handling == ERRORS_SENDER)
1092 {
1093 error_block eblock;
1094 eblock.next = NULL;
1095 eblock.text1 = text1;
1096 eblock.text2 = US"";
1097 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1098 error_rc = EXIT_FAILURE;
1099 }
1100 else
1101 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1102 (void)fclose(f);
1103 exim_exit(error_rc);
1104 }
1105
1106
1107
1108 /*************************************************
1109 * Add header lines set up by ACL *
1110 *************************************************/
1111
1112 /* This function is called to add the header lines that were set up by
1113 statements in an ACL to the list of headers in memory. It is done in two stages
1114 like this, because when the ACL for RCPT is running, the other headers have not
1115 yet been received. This function is called twice; once just before running the
1116 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1117 are visible to the DATA ACL.
1118
1119 Originally these header lines were added at the end. Now there is support for
1120 three different places: top, bottom, and after the Received: header(s). There
1121 will always be at least one Received: header, even if it is marked deleted, and
1122 even if something else has been put in front of it.
1123
1124 Arguments:
1125 acl_name text to identify which ACL
1126
1127 Returns: nothing
1128 */
1129
1130 static void
1131 add_acl_headers(int where, uschar *acl_name)
1132 {
1133 header_line *h, *next;
1134 header_line *last_received = NULL;
1135
1136 switch(where)
1137 {
1138 case ACL_WHERE_DKIM:
1139 case ACL_WHERE_MIME:
1140 case ACL_WHERE_DATA:
1141 if ( cutthrough.fd >= 0 && cutthrough.delivery
1142 && (acl_removed_headers || acl_added_headers))
1143 {
1144 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1145 " will not take effect on cutthrough deliveries");
1146 return;
1147 }
1148 }
1149
1150 if (acl_removed_headers)
1151 {
1152 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1153
1154 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1155 {
1156 const uschar * list = acl_removed_headers;
1157 int sep = ':'; /* This is specified as a colon-separated list */
1158 uschar *s;
1159 uschar buffer[128];
1160
1161 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1162 if (header_testname(h, s, Ustrlen(s), FALSE))
1163 {
1164 h->type = htype_old;
1165 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1166 }
1167 }
1168 acl_removed_headers = NULL;
1169 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1170 }
1171
1172 if (!acl_added_headers) return;
1173 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1174
1175 for (h = acl_added_headers; h; h = next)
1176 {
1177 next = h->next;
1178
1179 switch(h->type)
1180 {
1181 case htype_add_top:
1182 h->next = header_list;
1183 header_list = h;
1184 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1185 break;
1186
1187 case htype_add_rec:
1188 if (last_received == NULL)
1189 {
1190 last_received = header_list;
1191 while (!header_testname(last_received, US"Received", 8, FALSE))
1192 last_received = last_received->next;
1193 while (last_received->next != NULL &&
1194 header_testname(last_received->next, US"Received", 8, FALSE))
1195 last_received = last_received->next;
1196 }
1197 h->next = last_received->next;
1198 last_received->next = h;
1199 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1200 break;
1201
1202 case htype_add_rfc:
1203 /* add header before any header which is NOT Received: or Resent- */
1204 last_received = header_list;
1205 while ( (last_received->next != NULL) &&
1206 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1207 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1208 last_received = last_received->next;
1209 /* last_received now points to the last Received: or Resent-* header
1210 in an uninterrupted chain of those header types (seen from the beginning
1211 of all headers. Our current header must follow it. */
1212 h->next = last_received->next;
1213 last_received->next = h;
1214 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1215 break;
1216
1217 default:
1218 h->next = NULL;
1219 header_last->next = h;
1220 break;
1221 }
1222
1223 if (h->next == NULL) header_last = h;
1224
1225 /* Check for one of the known header types (From:, To:, etc.) though in
1226 practice most added headers are going to be "other". Lower case
1227 identification letters are never stored with the header; they are used
1228 for existence tests when messages are received. So discard any lower case
1229 flag values. */
1230
1231 h->type = header_checkname(h, FALSE);
1232 if (h->type >= 'a') h->type = htype_other;
1233
1234 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", header_last->text);
1235 }
1236
1237 acl_added_headers = NULL;
1238 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1239 }
1240
1241
1242
1243 /*************************************************
1244 * Add host information for log line *
1245 *************************************************/
1246
1247 /* Called for acceptance and rejecting log lines. This adds information about
1248 the calling host to a string that is being built dynamically.
1249
1250 Arguments:
1251 s the dynamic string
1252 sizeptr points to the size variable
1253 ptrptr points to the pointer variable
1254
1255 Returns: the extended string
1256 */
1257
1258 static uschar *
1259 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1260 {
1261 if (sender_fullhost)
1262 {
1263 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1264 s = string_cat(s, sizeptr, ptrptr, US" DS");
1265 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1266 if (LOGGING(incoming_interface) && interface_address != NULL)
1267 {
1268 s = string_cat(s, sizeptr, ptrptr,
1269 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1270 }
1271 }
1272 if (sender_ident != NULL)
1273 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1274 if (received_protocol != NULL)
1275 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1276 return s;
1277 }
1278
1279
1280
1281 #ifdef WITH_CONTENT_SCAN
1282
1283 /*************************************************
1284 * Run the MIME ACL on a message *
1285 *************************************************/
1286
1287 /* This code is in a subroutine so that it can be used for both SMTP
1288 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1289
1290 Arguments:
1291 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1292 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1293 smtp_reply_ptr Where SMTP reply is being built
1294 blackholed_by_ptr Where "blackholed by" message is being built
1295
1296 Returns: TRUE to carry on; FALSE to abandon the message
1297 */
1298
1299 static BOOL
1300 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1301 uschar **blackholed_by_ptr)
1302 {
1303 FILE *mbox_file;
1304 uschar rfc822_file_path[2048];
1305 unsigned long mbox_size;
1306 header_line *my_headerlist;
1307 uschar *user_msg, *log_msg;
1308 int mime_part_count_buffer = -1;
1309 int rc = OK;
1310
1311 memset(CS rfc822_file_path,0,2048);
1312
1313 /* check if it is a MIME message */
1314 my_headerlist = header_list;
1315 while (my_headerlist != NULL)
1316 {
1317 /* skip deleted headers */
1318 if (my_headerlist->type == '*')
1319 {
1320 my_headerlist = my_headerlist->next;
1321 continue;
1322 }
1323 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1324 {
1325 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1326 goto DO_MIME_ACL;
1327 }
1328 my_headerlist = my_headerlist->next;
1329 }
1330
1331 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1332 return TRUE;
1333
1334 DO_MIME_ACL:
1335 /* make sure the eml mbox file is spooled up */
1336 mbox_file = spool_mbox(&mbox_size, NULL);
1337 if (mbox_file == NULL) {
1338 /* error while spooling */
1339 log_write(0, LOG_MAIN|LOG_PANIC,
1340 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1341 Uunlink(spool_name);
1342 unspool_mbox();
1343 #ifdef EXPERIMENTAL_DCC
1344 dcc_ok = 0;
1345 #endif
1346 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1347 message_id[0] = 0; /* Indicate no message accepted */
1348 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1349 return FALSE; /* Indicate skip to end of receive function */
1350 };
1351
1352 mime_is_rfc822 = 0;
1353
1354 MIME_ACL_CHECK:
1355 mime_part_count = -1;
1356 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1357 (void)fclose(mbox_file);
1358
1359 if (Ustrlen(rfc822_file_path) > 0)
1360 {
1361 mime_part_count = mime_part_count_buffer;
1362
1363 if (unlink(CS rfc822_file_path) == -1)
1364 {
1365 log_write(0, LOG_PANIC,
1366 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1367 goto END_MIME_ACL;
1368 }
1369 }
1370
1371 /* check if we must check any message/rfc822 attachments */
1372 if (rc == OK)
1373 {
1374 uschar temp_path[1024];
1375 struct dirent * entry;
1376 DIR * tempdir;
1377
1378 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1379 spool_directory, message_id);
1380
1381 tempdir = opendir(CS temp_path);
1382 for (;;)
1383 {
1384 if (!(entry = readdir(tempdir)))
1385 break;
1386 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1387 {
1388 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1389 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1390 DEBUG(D_receive) debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1391 rfc822_file_path);
1392 break;
1393 }
1394 }
1395 closedir(tempdir);
1396
1397 if (entry)
1398 {
1399 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1400 {
1401 /* set RFC822 expansion variable */
1402 mime_is_rfc822 = 1;
1403 mime_part_count_buffer = mime_part_count;
1404 goto MIME_ACL_CHECK;
1405 }
1406 log_write(0, LOG_PANIC,
1407 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1408 unlink(CS rfc822_file_path);
1409 }
1410 }
1411
1412 END_MIME_ACL:
1413 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1414 if (rc == DISCARD)
1415 {
1416 recipients_count = 0;
1417 *blackholed_by_ptr = US"MIME ACL";
1418 }
1419 else if (rc != OK)
1420 {
1421 Uunlink(spool_name);
1422 unspool_mbox();
1423 #ifdef EXPERIMENTAL_DCC
1424 dcc_ok = 0;
1425 #endif
1426 if ( smtp_input
1427 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1428 {
1429 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1430 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1431 }
1432 message_id[0] = 0; /* Indicate no message accepted */
1433 return FALSE; /* Cause skip to end of receive function */
1434 }
1435
1436 return TRUE;
1437 }
1438
1439 #endif /* WITH_CONTENT_SCAN */
1440
1441
1442
1443 void
1444 received_header_gen(void)
1445 {
1446 uschar *received;
1447 uschar *timestamp;
1448 header_line *received_header= header_list;
1449
1450 timestamp = expand_string(US"${tod_full}");
1451 if (recipients_count == 1) received_for = recipients_list[0].address;
1452 received = expand_string(received_header_text);
1453 received_for = NULL;
1454
1455 if (!received)
1456 {
1457 if(spool_name[0] != 0)
1458 Uunlink(spool_name); /* Lose the data file */
1459 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1460 "(received_header_text) failed: %s", string_printing(received_header_text),
1461 expand_string_message);
1462 }
1463
1464 /* The first element on the header chain is reserved for the Received header,
1465 so all we have to do is fill in the text pointer, and set the type. However, if
1466 the result of the expansion is an empty string, we leave the header marked as
1467 "old" so as to refrain from adding a Received header. */
1468
1469 if (received[0] == 0)
1470 {
1471 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1472 received_header->type = htype_old;
1473 }
1474 else
1475 {
1476 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1477 received_header->type = htype_received;
1478 }
1479
1480 received_header->slen = Ustrlen(received_header->text);
1481
1482 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1483 received_header->type, received_header->text);
1484 }
1485
1486
1487
1488 /*************************************************
1489 * Receive message *
1490 *************************************************/
1491
1492 /* Receive a message on the given input, and put it into a pair of spool files.
1493 Either a non-null list of recipients, or the extract flag will be true, or
1494 both. The flag sender_local is true for locally generated messages. The flag
1495 submission_mode is true if an ACL has obeyed "control = submission". The flag
1496 suppress_local_fixups is true if an ACL has obeyed "control =
1497 suppress_local_fixups" or -G was passed on the command-line.
1498 The flag smtp_input is true if the message is to be
1499 handled using SMTP conventions about termination and lines starting with dots.
1500 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1501
1502 If a message was successfully read, message_id[0] will be non-zero.
1503
1504 The general actions of this function are:
1505
1506 . Read the headers of the message (if any) into a chain of store
1507 blocks.
1508
1509 . If there is a "sender:" header and the message is locally originated,
1510 throw it away, unless the caller is trusted, or unless
1511 active_local_sender_retain is set - which can only happen if
1512 active_local_from_check is false.
1513
1514 . If recipients are to be extracted from the message, build the
1515 recipients list from the headers, removing any that were on the
1516 original recipients list (unless extract_addresses_remove_arguments is
1517 false), and at the same time, remove any bcc header that may be present.
1518
1519 . Get the spool file for the data, sort out its unique name, open
1520 and lock it (but don't give it the name yet).
1521
1522 . Generate a "Message-Id" header if the message doesn't have one, for
1523 locally-originated messages.
1524
1525 . Generate a "Received" header.
1526
1527 . Ensure the recipients list is fully qualified and rewritten if necessary.
1528
1529 . If there are any rewriting rules, apply them to the sender address
1530 and also to the headers.
1531
1532 . If there is no from: header, generate one, for locally-generated messages
1533 and messages in "submission mode" only.
1534
1535 . If the sender is local, check that from: is correct, and if not, generate
1536 a Sender: header, unless message comes from a trusted caller, or this
1537 feature is disabled by active_local_from_check being false.
1538
1539 . If there is no "date" header, generate one, for locally-originated
1540 or submission mode messages only.
1541
1542 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1543 dot_ends mode, to the data file. Leave it open, to hold the lock.
1544
1545 . Write the envelope and the headers to a new file.
1546
1547 . Set the name for the header file; close it.
1548
1549 . Set the name for the data file; close it.
1550
1551 Because this function can potentially be called many times in a single
1552 SMTP connection, all store should be got by store_get(), so that it will be
1553 automatically retrieved after the message is accepted.
1554
1555 FUDGE: It seems that sites on the net send out messages with just LF
1556 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1557 we make the CRs optional in all cases.
1558
1559 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1560 new regime is now in place in which bare CRs in header lines are turned into LF
1561 followed by a space, so as not to terminate the header line.
1562
1563 February 2004: A bare LF in a header line in a message whose first line was
1564 terminated by CRLF is treated in the same way as a bare CR.
1565
1566 Arguments:
1567 extract_recip TRUE if recipients are to be extracted from the message's
1568 headers
1569
1570 Returns: TRUE there are more messages to be read (SMTP input)
1571 FALSE there are no more messages to be read (non-SMTP input
1572 or SMTP connection collapsed, or other failure)
1573
1574 When reading a message for filter testing, the returned value indicates
1575 whether the headers (which is all that is read) were terminated by '.' or
1576 not. */
1577
1578 BOOL
1579 receive_msg(BOOL extract_recip)
1580 {
1581 int i;
1582 int rc = FAIL;
1583 int msg_size = 0;
1584 int process_info_len = Ustrlen(process_info);
1585 int error_rc = (error_handling == ERRORS_SENDER)?
1586 errors_sender_rc : EXIT_FAILURE;
1587 int header_size = 256;
1588 int start, end, domain, size, sptr;
1589 int id_resolution;
1590 int had_zero = 0;
1591 int prevlines_length = 0;
1592
1593 register int ptr = 0;
1594
1595 BOOL contains_resent_headers = FALSE;
1596 BOOL extracted_ignored = FALSE;
1597 BOOL first_line_ended_crlf = TRUE_UNSET;
1598 BOOL smtp_yield = TRUE;
1599 BOOL yield = FALSE;
1600
1601 BOOL resents_exist = FALSE;
1602 uschar *resent_prefix = US"";
1603 uschar *blackholed_by = NULL;
1604 uschar *blackhole_log_msg = US"";
1605 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1606
1607 flock_t lock_data;
1608 error_block *bad_addresses = NULL;
1609
1610 uschar *frozen_by = NULL;
1611 uschar *queued_by = NULL;
1612
1613 uschar *errmsg, *s;
1614 struct stat statbuf;
1615
1616 /* Final message to give to SMTP caller, and messages from ACLs */
1617
1618 uschar *smtp_reply = NULL;
1619 uschar *user_msg, *log_msg;
1620
1621 /* Working header pointers */
1622
1623 header_line *h, *next;
1624
1625 /* Flags for noting the existence of certain headers (only one left) */
1626
1627 BOOL date_header_exists = FALSE;
1628
1629 /* Pointers to receive the addresses of headers whose contents we need. */
1630
1631 header_line *from_header = NULL;
1632 header_line *subject_header = NULL;
1633 header_line *msgid_header = NULL;
1634 header_line *received_header;
1635
1636 #ifdef EXPERIMENTAL_DMARC
1637 int dmarc_up = 0;
1638 #endif /* EXPERIMENTAL_DMARC */
1639
1640 /* Variables for use when building the Received: header. */
1641
1642 uschar *timestamp;
1643 int tslen;
1644
1645 /* Release any open files that might have been cached while preparing to
1646 accept the message - e.g. by verifying addresses - because reading a message
1647 might take a fair bit of real time. */
1648
1649 search_tidyup();
1650
1651 /* Extracting the recipient list from an input file is incompatible with
1652 cutthrough delivery with the no-spool option. It shouldn't be possible
1653 to set up the combination, but just in case kill any ongoing connection. */
1654 if (extract_recip || !smtp_input)
1655 cancel_cutthrough_connection(TRUE, US"not smtp input");
1656
1657 /* Initialize the chain of headers by setting up a place-holder for Received:
1658 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1659 pointing to the end of the chain to make adding headers simple. */
1660
1661 received_header = header_list = header_last = store_get(sizeof(header_line));
1662 header_list->next = NULL;
1663 header_list->type = htype_old;
1664 header_list->text = NULL;
1665 header_list->slen = 0;
1666
1667 /* Control block for the next header to be read. */
1668
1669 next = store_get(sizeof(header_line));
1670 next->text = store_get(header_size);
1671
1672 /* Initialize message id to be null (indicating no message read), and the
1673 header names list to be the normal list. Indicate there is no data file open
1674 yet, initialize the size and warning count, and deal with no size limit. */
1675
1676 message_id[0] = 0;
1677 data_file = NULL;
1678 data_fd = -1;
1679 spool_name = US"";
1680 message_size = 0;
1681 warning_count = 0;
1682 received_count = 1; /* For the one we will add */
1683
1684 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1685
1686 /* While reading the message, the following counts are computed. */
1687
1688 message_linecount = body_linecount = body_zerocount =
1689 max_received_linelength = 0;
1690
1691 #ifndef DISABLE_DKIM
1692 /* Call into DKIM to set up the context. In CHUNKING mode
1693 we clear the dot-stuffing flag */
1694 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1695 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1696 #endif
1697
1698 #ifdef EXPERIMENTAL_DMARC
1699 /* initialize libopendmarc */
1700 dmarc_up = dmarc_init();
1701 #endif
1702
1703 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1704 ids, and fractions of a second are required. See the comments that precede the
1705 message id creation below. */
1706
1707 (void)gettimeofday(&message_id_tv, NULL);
1708
1709 /* For other uses of the received time we can operate with granularity of one
1710 second, and for that we use the global variable received_time. This is for
1711 things like ultimate message timeouts. */
1712
1713 received_time = message_id_tv.tv_sec;
1714
1715 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1716 happen in the smtp_getc() function when it refills its buffer. */
1717
1718 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1719
1720 /* If not SMTP input, timeout happens only if configured, and we just set a
1721 single timeout for the whole message. */
1722
1723 else if (receive_timeout > 0)
1724 {
1725 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1726 alarm(receive_timeout);
1727 }
1728
1729 /* SIGTERM and SIGINT are caught always. */
1730
1731 signal(SIGTERM, data_sigterm_sigint_handler);
1732 signal(SIGINT, data_sigterm_sigint_handler);
1733
1734 /* Header lines in messages are not supposed to be very long, though when
1735 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1736 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1737 storing the header, and extend this as necessary using string_cat().
1738
1739 To cope with total lunacies, impose an upper limit on the length of the header
1740 section of the message, as otherwise the store will fill up. We must also cope
1741 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1742 Folded header lines are joined into one string, leaving the '\n' characters
1743 inside them, so that writing them out reproduces the input.
1744
1745 Loop for each character of each header; the next structure for chaining the
1746 header is set up already, with ptr the offset of the next character in
1747 next->text. */
1748
1749 for (;;)
1750 {
1751 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1752
1753 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1754 SMTP must have a correct "." terminator. */
1755
1756 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1757 {
1758 smtp_reply = handle_lost_connection(US" (header)");
1759 smtp_yield = FALSE;
1760 goto TIDYUP; /* Skip to end of function */
1761 }
1762
1763 /* See if we are at the current header's size limit - there must be at least
1764 four bytes left. This allows for the new character plus a zero, plus two for
1765 extra insertions when we are playing games with dots and carriage returns. If
1766 we are at the limit, extend the text buffer. This could have been done
1767 automatically using string_cat() but because this is a tightish loop storing
1768 only one character at a time, we choose to do it inline. Normally
1769 store_extend() will be able to extend the block; only at the end of a big
1770 store block will a copy be needed. To handle the case of very long headers
1771 (and sometimes lunatic messages can have ones that are 100s of K long) we
1772 call store_release() for strings that have been copied - if the string is at
1773 the start of a block (and therefore the only thing in it, because we aren't
1774 doing any other gets), the block gets freed. We can only do this because we
1775 know there are no other calls to store_get() going on. */
1776
1777 if (ptr >= header_size - 4)
1778 {
1779 int oldsize = header_size;
1780 /* header_size += 256; */
1781 header_size *= 2;
1782 if (!store_extend(next->text, oldsize, header_size))
1783 {
1784 uschar *newtext = store_get(header_size);
1785 memcpy(newtext, next->text, ptr);
1786 store_release(next->text);
1787 next->text = newtext;
1788 }
1789 }
1790
1791 /* Cope with receiving a binary zero. There is dispute about whether
1792 these should be allowed in RFC 822 messages. The middle view is that they
1793 should not be allowed in headers, at least. Exim takes this attitude at
1794 the moment. We can't just stomp on them here, because we don't know that
1795 this line is a header yet. Set a flag to cause scanning later. */
1796
1797 if (ch == 0) had_zero++;
1798
1799 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1800 those from data files use just LF. Treat LF in local SMTP input as a
1801 terminator too. Treat EOF as a line terminator always. */
1802
1803 if (ch == EOF) goto EOL;
1804
1805 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1806 other MTAs accept this. We are therefore forced into this "liberalisation"
1807 too, so we accept LF as a line terminator whatever the source of the message.
1808 However, if the first line of the message ended with a CRLF, we treat a bare
1809 LF specially by inserting a white space after it to ensure that the header
1810 line is not terminated. */
1811
1812 if (ch == '\n')
1813 {
1814 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1815 else if (first_line_ended_crlf) receive_ungetc(' ');
1816 goto EOL;
1817 }
1818
1819 /* This is not the end of the line. If this is SMTP input and this is
1820 the first character in the line and it is a "." character, ignore it.
1821 This implements the dot-doubling rule, though header lines starting with
1822 dots aren't exactly common. They are legal in RFC 822, though. If the
1823 following is CRLF or LF, this is the line that that terminates the
1824 entire message. We set message_ended to indicate this has happened (to
1825 prevent further reading), and break out of the loop, having freed the
1826 empty header, and set next = NULL to indicate no data line. */
1827
1828 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1829 {
1830 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1831 if (ch == '\r')
1832 {
1833 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1834 if (ch != '\n')
1835 {
1836 receive_ungetc(ch);
1837 ch = '\r'; /* Revert to CR */
1838 }
1839 }
1840 if (ch == '\n')
1841 {
1842 message_ended = END_DOT;
1843 store_reset(next);
1844 next = NULL;
1845 break; /* End character-reading loop */
1846 }
1847
1848 /* For non-SMTP input, the dot at the start of the line was really a data
1849 character. What is now in ch is the following character. We guaranteed
1850 enough space for this above. */
1851
1852 if (!smtp_input)
1853 {
1854 next->text[ptr++] = '.';
1855 message_size++;
1856 }
1857 }
1858
1859 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1860 remember this case if this is the first line ending. */
1861
1862 if (ch == '\r')
1863 {
1864 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1865 if (ch == '\n')
1866 {
1867 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1868 goto EOL;
1869 }
1870
1871 /* Otherwise, put back the character after CR, and turn the bare CR
1872 into LF SP. */
1873
1874 ch = (receive_ungetc)(ch);
1875 next->text[ptr++] = '\n';
1876 message_size++;
1877 ch = ' ';
1878 }
1879
1880 /* We have a data character for the header line. */
1881
1882 next->text[ptr++] = ch; /* Add to buffer */
1883 message_size++; /* Total message size so far */
1884
1885 /* Handle failure due to a humungously long header section. The >= allows
1886 for the terminating \n. Add what we have so far onto the headers list so
1887 that it gets reflected in any error message, and back up the just-read
1888 character. */
1889
1890 if (message_size >= header_maxsize)
1891 {
1892 next->text[ptr] = 0;
1893 next->slen = ptr;
1894 next->type = htype_other;
1895 next->next = NULL;
1896 header_last->next = next;
1897 header_last = next;
1898
1899 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1900 "%s (more than %d characters): message abandoned",
1901 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1902
1903 if (smtp_input)
1904 {
1905 smtp_reply = US"552 Message header is ridiculously long";
1906 receive_swallow_smtp();
1907 goto TIDYUP; /* Skip to end of function */
1908 }
1909
1910 else
1911 {
1912 give_local_error(ERRMESS_VLONGHEADER,
1913 string_sprintf("message header longer than %d characters received: "
1914 "message not accepted", header_maxsize), US"", error_rc, stdin,
1915 header_list->next);
1916 /* Does not return */
1917 }
1918 }
1919
1920 continue; /* With next input character */
1921
1922 /* End of header line reached */
1923
1924 EOL:
1925
1926 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1927
1928 receive_linecount++;
1929 message_linecount++;
1930
1931 /* Keep track of maximum line length */
1932
1933 if (ptr - prevlines_length > max_received_linelength)
1934 max_received_linelength = ptr - prevlines_length;
1935 prevlines_length = ptr + 1;
1936
1937 /* Now put in the terminating newline. There is always space for
1938 at least two more characters. */
1939
1940 next->text[ptr++] = '\n';
1941 message_size++;
1942
1943 /* A blank line signals the end of the headers; release the unwanted
1944 space and set next to NULL to indicate this. */
1945
1946 if (ptr == 1)
1947 {
1948 store_reset(next);
1949 next = NULL;
1950 break;
1951 }
1952
1953 /* There is data in the line; see if the next input character is a
1954 whitespace character. If it is, we have a continuation of this header line.
1955 There is always space for at least one character at this point. */
1956
1957 if (ch != EOF)
1958 {
1959 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1960 if (nextch == ' ' || nextch == '\t')
1961 {
1962 next->text[ptr++] = nextch;
1963 message_size++;
1964 continue; /* Iterate the loop */
1965 }
1966 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1967 else ch = EOF; /* Cause main loop to exit at end */
1968 }
1969
1970 /* We have got to the real line end. Terminate the string and release store
1971 beyond it. If it turns out to be a real header, internal binary zeros will
1972 be squashed later. */
1973
1974 next->text[ptr] = 0;
1975 next->slen = ptr;
1976 store_reset(next->text + ptr + 1);
1977
1978 /* Check the running total size against the overall message size limit. We
1979 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1980 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1981 headers - the code to read the body will then also hit the buffer. */
1982
1983 if (message_size > thismessage_size_limit) break;
1984
1985 /* A line that is not syntactically correct for a header also marks
1986 the end of the headers. In this case, we leave next containing the
1987 first data line. This might actually be several lines because of the
1988 continuation logic applied above, but that doesn't matter.
1989
1990 It turns out that smail, and presumably sendmail, accept leading lines
1991 of the form
1992
1993 From ph10 Fri Jan 5 12:35 GMT 1996
1994
1995 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1996 find any documentation of this, but for compatibility it had better be
1997 accepted. Exim restricts it to the case of non-smtp messages, and
1998 treats it as an alternative to the -f command line option. Thus it is
1999 ignored except for trusted users or filter testing. Otherwise it is taken
2000 as the sender address, unless -f was used (sendmail compatibility).
2001
2002 It further turns out that some UUCPs generate the From_line in a different
2003 format, e.g.
2004
2005 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2006
2007 The regex for matching these things is now capable of recognizing both
2008 formats (including 2- and 4-digit years in the latter). In fact, the regex
2009 is now configurable, as is the expansion string to fish out the sender.
2010
2011 Even further on it has been discovered that some broken clients send
2012 these lines in SMTP messages. There is now an option to ignore them from
2013 specified hosts or networks. Sigh. */
2014
2015 if (header_last == header_list &&
2016 (!smtp_input
2017 ||
2018 (sender_host_address != NULL &&
2019 verify_check_host(&ignore_fromline_hosts) == OK)
2020 ||
2021 (sender_host_address == NULL && ignore_fromline_local)
2022 ) &&
2023 regex_match_and_setup(regex_From, next->text, 0, -1))
2024 {
2025 if (!sender_address_forced)
2026 {
2027 uschar *uucp_sender = expand_string(uucp_from_sender);
2028 if (uucp_sender == NULL)
2029 {
2030 log_write(0, LOG_MAIN|LOG_PANIC,
2031 "expansion of \"%s\" failed after matching "
2032 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2033 }
2034 else
2035 {
2036 int start, end, domain;
2037 uschar *errmess;
2038 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2039 &start, &end, &domain, TRUE);
2040 if (newsender != NULL)
2041 {
2042 if (domain == 0 && newsender[0] != 0)
2043 newsender = rewrite_address_qualify(newsender, FALSE);
2044
2045 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2046 {
2047 sender_address = newsender;
2048
2049 if (trusted_caller || filter_test != FTEST_NONE)
2050 {
2051 authenticated_sender = NULL;
2052 originator_name = US"";
2053 sender_local = FALSE;
2054 }
2055
2056 if (filter_test != FTEST_NONE)
2057 printf("Sender taken from \"From \" line\n");
2058 }
2059 }
2060 }
2061 }
2062 }
2063
2064 /* Not a leading "From " line. Check to see if it is a valid header line.
2065 Header names may contain any non-control characters except space and colon,
2066 amazingly. */
2067
2068 else
2069 {
2070 uschar *p = next->text;
2071
2072 /* If not a valid header line, break from the header reading loop, leaving
2073 next != NULL, indicating that it holds the first line of the body. */
2074
2075 if (isspace(*p)) break;
2076 while (mac_isgraph(*p) && *p != ':') p++;
2077 while (isspace(*p)) p++;
2078 if (*p != ':')
2079 {
2080 body_zerocount = had_zero;
2081 break;
2082 }
2083
2084 /* We have a valid header line. If there were any binary zeroes in
2085 the line, stomp on them here. */
2086
2087 if (had_zero > 0)
2088 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2089
2090 /* It is perfectly legal to have an empty continuation line
2091 at the end of a header, but it is confusing to humans
2092 looking at such messages, since it looks like a blank line.
2093 Reduce confusion by removing redundant white space at the
2094 end. We know that there is at least one printing character
2095 (the ':' tested for above) so there is no danger of running
2096 off the end. */
2097
2098 p = next->text + ptr - 2;
2099 for (;;)
2100 {
2101 while (*p == ' ' || *p == '\t') p--;
2102 if (*p != '\n') break;
2103 ptr = (p--) - next->text + 1;
2104 message_size -= next->slen - ptr;
2105 next->text[ptr] = 0;
2106 next->slen = ptr;
2107 }
2108
2109 /* Add the header to the chain */
2110
2111 next->type = htype_other;
2112 next->next = NULL;
2113 header_last->next = next;
2114 header_last = next;
2115
2116 /* Check the limit for individual line lengths. This comes after adding to
2117 the chain so that the failing line is reflected if a bounce is generated
2118 (for a local message). */
2119
2120 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2121 {
2122 log_write(0, LOG_MAIN, "overlong message header line received from "
2123 "%s (more than %d characters): message abandoned",
2124 sender_host_unknown? sender_ident : sender_fullhost,
2125 header_line_maxsize);
2126
2127 if (smtp_input)
2128 {
2129 smtp_reply = US"552 A message header line is too long";
2130 receive_swallow_smtp();
2131 goto TIDYUP; /* Skip to end of function */
2132 }
2133
2134 else
2135 {
2136 give_local_error(ERRMESS_VLONGHDRLINE,
2137 string_sprintf("message header line longer than %d characters "
2138 "received: message not accepted", header_line_maxsize), US"",
2139 error_rc, stdin, header_list->next);
2140 /* Does not return */
2141 }
2142 }
2143
2144 /* Note if any resent- fields exist. */
2145
2146 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2147 {
2148 resents_exist = TRUE;
2149 resent_prefix = US"Resent-";
2150 }
2151 }
2152
2153 /* Reject CHUNKING messages that do not CRLF their first header line */
2154
2155 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2156 {
2157 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2158 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2159 sender_address,
2160 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2161 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2162 smtp_printf("552 Message header not CRLF terminated\r\n");
2163 bdat_flush_data();
2164 smtp_reply = US"";
2165 goto TIDYUP; /* Skip to end of function */
2166 }
2167
2168 /* The line has been handled. If we have hit EOF, break out of the loop,
2169 indicating no pending data line. */
2170
2171 if (ch == EOF) { next = NULL; break; }
2172
2173 /* Set up for the next header */
2174
2175 header_size = 256;
2176 next = store_get(sizeof(header_line));
2177 next->text = store_get(header_size);
2178 ptr = 0;
2179 had_zero = 0;
2180 prevlines_length = 0;
2181 } /* Continue, starting to read the next header */
2182
2183 /* At this point, we have read all the headers into a data structure in main
2184 store. The first header is still the dummy placeholder for the Received: header
2185 we are going to generate a bit later on. If next != NULL, it contains the first
2186 data line - which terminated the headers before reaching a blank line (not the
2187 normal case). */
2188
2189 DEBUG(D_receive)
2190 {
2191 debug_printf(">>Headers received:\n");
2192 for (h = header_list->next; h; h = h->next)
2193 debug_printf("%s", h->text);
2194 debug_printf("\n");
2195 }
2196
2197 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2198 is dropped immediately after valid headers, the next thing we will see is EOF.
2199 We must test for this specially, as further down the reading of the data is
2200 skipped if already at EOF. */
2201
2202 if (smtp_input && (receive_feof)())
2203 {
2204 smtp_reply = handle_lost_connection(US" (after header)");
2205 smtp_yield = FALSE;
2206 goto TIDYUP; /* Skip to end of function */
2207 }
2208
2209 /* If this is a filter test run and no headers were read, output a warning
2210 in case there is a mistake in the test message. */
2211
2212 if (filter_test != FTEST_NONE && header_list->next == NULL)
2213 printf("Warning: no message headers read\n");
2214
2215
2216 /* Scan the headers to identify them. Some are merely marked for later
2217 processing; some are dealt with here. */
2218
2219 for (h = header_list->next; h; h = h->next)
2220 {
2221 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2222 if (is_resent) contains_resent_headers = TRUE;
2223
2224 switch (header_checkname(h, is_resent))
2225 {
2226 case htype_bcc:
2227 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2228 break;
2229
2230 case htype_cc:
2231 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2232 break;
2233
2234 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2235
2236 case htype_date:
2237 if (!resents_exist || is_resent) date_header_exists = TRUE;
2238 break;
2239
2240 /* Same comments as about Return-Path: below. */
2241
2242 case htype_delivery_date:
2243 if (delivery_date_remove) h->type = htype_old;
2244 break;
2245
2246 /* Same comments as about Return-Path: below. */
2247
2248 case htype_envelope_to:
2249 if (envelope_to_remove) h->type = htype_old;
2250 break;
2251
2252 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2253 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2254 header consists of just the login id of the user who called Exim, rewrite
2255 it with the gecos field first. Apply this rule to Resent-From: if there
2256 are resent- fields. */
2257
2258 case htype_from:
2259 h->type = htype_from;
2260 if (!resents_exist || is_resent)
2261 {
2262 from_header = h;
2263 if (!smtp_input)
2264 {
2265 int len;
2266 uschar *s = Ustrchr(h->text, ':') + 1;
2267 while (isspace(*s)) s++;
2268 len = h->slen - (s - h->text) - 1;
2269 if (Ustrlen(originator_login) == len &&
2270 strncmpic(s, originator_login, len) == 0)
2271 {
2272 uschar *name = is_resent? US"Resent-From" : US"From";
2273 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2274 originator_login, qualify_domain_sender);
2275 from_header = header_last;
2276 h->type = htype_old;
2277 DEBUG(D_receive|D_rewrite)
2278 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2279 }
2280 }
2281 }
2282 break;
2283
2284 /* Identify the Message-id: header for generating "in-reply-to" in the
2285 autoreply transport. For incoming logging, save any resent- value. In both
2286 cases, take just the first of any multiples. */
2287
2288 case htype_id:
2289 if (msgid_header == NULL && (!resents_exist || is_resent))
2290 {
2291 msgid_header = h;
2292 h->type = htype_id;
2293 }
2294 break;
2295
2296 /* Flag all Received: headers */
2297
2298 case htype_received:
2299 h->type = htype_received;
2300 received_count++;
2301 break;
2302
2303 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2304
2305 case htype_reply_to:
2306 h->type = htype_reply_to;
2307 break;
2308
2309 /* The Return-path: header is supposed to be added to messages when
2310 they leave the SMTP system. We shouldn't receive messages that already
2311 contain Return-path. However, since Exim generates Return-path: on
2312 local delivery, resent messages may well contain it. We therefore
2313 provide an option (which defaults on) to remove any Return-path: headers
2314 on input. Removal actually means flagging as "old", which prevents the
2315 header being transmitted with the message. */
2316
2317 case htype_return_path:
2318 if (return_path_remove) h->type = htype_old;
2319
2320 /* If we are testing a mail filter file, use the value of the
2321 Return-Path: header to set up the return_path variable, which is not
2322 otherwise set. However, remove any <> that surround the address
2323 because the variable doesn't have these. */
2324
2325 if (filter_test != FTEST_NONE)
2326 {
2327 uschar *start = h->text + 12;
2328 uschar *end = start + Ustrlen(start);
2329 while (isspace(*start)) start++;
2330 while (end > start && isspace(end[-1])) end--;
2331 if (*start == '<' && end[-1] == '>')
2332 {
2333 start++;
2334 end--;
2335 }
2336 return_path = string_copyn(start, end - start);
2337 printf("Return-path taken from \"Return-path:\" header line\n");
2338 }
2339 break;
2340
2341 /* If there is a "Sender:" header and the message is locally originated,
2342 and from an untrusted caller and suppress_local_fixups is not set, or if we
2343 are in submission mode for a remote message, mark it "old" so that it will
2344 not be transmitted with the message, unless active_local_sender_retain is
2345 set. (This can only be true if active_local_from_check is false.) If there
2346 are any resent- headers in the message, apply this rule to Resent-Sender:
2347 instead of Sender:. Messages with multiple resent- header sets cannot be
2348 tidily handled. (For this reason, at least one MUA - Pine - turns old
2349 resent- headers into X-resent- headers when resending, leaving just one
2350 set.) */
2351
2352 case htype_sender:
2353 h->type = ((!active_local_sender_retain &&
2354 (
2355 (sender_local && !trusted_caller && !suppress_local_fixups)
2356 || submission_mode
2357 )
2358 ) &&
2359 (!resents_exist||is_resent))?
2360 htype_old : htype_sender;
2361 break;
2362
2363 /* Remember the Subject: header for logging. There is no Resent-Subject */
2364
2365 case htype_subject:
2366 subject_header = h;
2367 break;
2368
2369 /* "To:" gets flagged, and the existence of a recipient header is noted,
2370 whether it's resent- or not. */
2371
2372 case htype_to:
2373 h->type = htype_to;
2374 /****
2375 to_or_cc_header_exists = TRUE;
2376 ****/
2377 break;
2378 }
2379 }
2380
2381 /* Extract recipients from the headers if that is required (the -t option).
2382 Note that this is documented as being done *before* any address rewriting takes
2383 place. There are two possibilities:
2384
2385 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2386 recipients already listed are to be REMOVED from the message. Smail 3 works
2387 like this. We need to build a non-recipients tree for that list, because in
2388 subsequent processing this data is held in a tree and that's what the
2389 spool_write_header() function expects. Make sure that non-recipient addresses
2390 are fully qualified and rewritten if necessary.
2391
2392 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2393 those in the command line arguments (and it is rumoured some other MTAs do
2394 this). Therefore, there is an option to make Exim behave this way.
2395
2396 *** Notes on "Resent-" header lines ***
2397
2398 The presence of resent-headers in the message makes -t horribly ambiguous.
2399 Experiments with sendmail showed that it uses recipients for all resent-
2400 headers, totally ignoring the concept of "sets of resent- headers" as described
2401 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2402 with all the addresses in one instance of each header.
2403
2404 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2405 error for -t if there were resent- headers in the message. However, after a
2406 discussion on the mailing list, I've learned that there are MUAs that use
2407 resent- headers with -t, and also that the stuff about sets of resent- headers
2408 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2409 message with -t and resent- header lines makes sure that only *its* resent-
2410 headers are present; previous ones are often renamed as X-resent- for example.
2411
2412 Consequently, Exim has been changed so that, if any resent- header lines are
2413 present, the recipients are taken from all of the appropriate resent- lines,
2414 and not from the ordinary To:, Cc:, etc. */
2415
2416 if (extract_recip)
2417 {
2418 int rcount = 0;
2419 error_block **bnext = &bad_addresses;
2420
2421 if (extract_addresses_remove_arguments)
2422 {
2423 while (recipients_count-- > 0)
2424 {
2425 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2426 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2427 tree_add_nonrecipient(s);
2428 }
2429 recipients_list = NULL;
2430 recipients_count = recipients_list_max = 0;
2431 }
2432
2433 /* Now scan the headers */
2434
2435 for (h = header_list->next; h; h = h->next)
2436 {
2437 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2438 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2439 {
2440 uschar *s = Ustrchr(h->text, ':') + 1;
2441 while (isspace(*s)) s++;
2442
2443 parse_allow_group = TRUE; /* Allow address group syntax */
2444
2445 while (*s != 0)
2446 {
2447 uschar *ss = parse_find_address_end(s, FALSE);
2448 uschar *recipient, *errmess, *p, *pp;
2449 int start, end, domain;
2450
2451 /* Check on maximum */
2452
2453 if (recipients_max > 0 && ++rcount > recipients_max)
2454 {
2455 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2456 US"message rejected: ", error_rc, stdin, NULL);
2457 /* Does not return */
2458 }
2459
2460 /* Make a copy of the address, and remove any internal newlines. These
2461 may be present as a result of continuations of the header line. The
2462 white space that follows the newline must not be removed - it is part
2463 of the header. */
2464
2465 pp = recipient = store_get(ss - s + 1);
2466 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2467 *pp = 0;
2468
2469 #ifdef SUPPORT_I18N
2470 {
2471 BOOL b = allow_utf8_domains;
2472 allow_utf8_domains = TRUE;
2473 #endif
2474 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2475 &domain, FALSE);
2476
2477 #ifdef SUPPORT_I18N
2478 if (string_is_utf8(recipient))
2479 message_smtputf8 = TRUE;
2480 else
2481 allow_utf8_domains = b;
2482 }
2483 #endif
2484
2485 /* Keep a list of all the bad addresses so we can send a single
2486 error message at the end. However, an empty address is not an error;
2487 just ignore it. This can come from an empty group list like
2488
2489 To: Recipients of list:;
2490
2491 If there are no recipients at all, an error will occur later. */
2492
2493 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2494 {
2495 int len = Ustrlen(s);
2496 error_block *b = store_get(sizeof(error_block));
2497 while (len > 0 && isspace(s[len-1])) len--;
2498 b->next = NULL;
2499 b->text1 = string_printing(string_copyn(s, len));
2500 b->text2 = errmess;
2501 *bnext = b;
2502 bnext = &(b->next);
2503 }
2504
2505 /* If the recipient is already in the nonrecipients tree, it must
2506 have appeared on the command line with the option extract_addresses_
2507 remove_arguments set. Do not add it to the recipients, and keep a note
2508 that this has happened, in order to give a better error if there are
2509 no recipients left. */
2510
2511 else if (recipient != NULL)
2512 {
2513 if (tree_search(tree_nonrecipients, recipient) == NULL)
2514 receive_add_recipient(recipient, -1);
2515 else
2516 extracted_ignored = TRUE;
2517 }
2518
2519 /* Move on past this address */
2520
2521 s = ss + (*ss? 1:0);
2522 while (isspace(*s)) s++;
2523 } /* Next address */
2524
2525 parse_allow_group = FALSE; /* Reset group syntax flags */
2526 parse_found_group = FALSE;
2527
2528 /* If this was the bcc: header, mark it "old", which means it
2529 will be kept on the spool, but not transmitted as part of the
2530 message. */
2531
2532 if (h->type == htype_bcc) h->type = htype_old;
2533 } /* For appropriate header line */
2534 } /* For each header line */
2535
2536 }
2537
2538 /* Now build the unique message id. This has changed several times over the
2539 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2540 Retaining all the history in the comment has become too unwieldy - read
2541 previous release sources if you want it.
2542
2543 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2544 The first part is the current time, in seconds. The second part is the current
2545 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2546 can hold a number in the range 0-3843. It used to be a computed sequence
2547 number, but is now the fractional component of the current time in units of
2548 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2549 received, Exim ensures that the timer has ticked at the appropriate level
2550 before proceeding, to avoid duplication if the pid happened to be re-used
2551 within the same time period. It seems likely that most messages will take at
2552 least half a millisecond to be received, so no delay will normally be
2553 necessary. At least for some time...
2554
2555 There is a modification when localhost_number is set. Formerly this was allowed
2556 to be as large as 255. Now it is restricted to the range 0-16, and the final
2557 component of the message id becomes (localhost_number * 200) + fractional time
2558 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2559
2560 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2561 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2562 still allows the tttttt field to hold a large enough number to last for some
2563 more decades, and the final two-digit field can hold numbers up to 1295, which
2564 is enough for milliseconds (instead of 1/2000 of a second).
2565
2566 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2567 pid, so it is probably safe because pids have to be positive. The
2568 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2569 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2570
2571 Note that string_base62() returns its data in a static storage block, so it
2572 must be copied before calling string_base62() again. It always returns exactly
2573 6 characters.
2574
2575 There doesn't seem to be anything in the RFC which requires a message id to
2576 start with a letter, but Smail was changed to ensure this. The external form of
2577 the message id (as supplied by string expansion) therefore starts with an
2578 additional leading 'E'. The spool file names do not include this leading
2579 letter and it is not used internally.
2580
2581 NOTE: If ever the format of message ids is changed, the regular expression for
2582 checking that a string is in this format must be updated in a corresponding
2583 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2584 must also be changed to reflect the correct string length. Then, of course,
2585 other programs that rely on the message id format will need updating too. */
2586
2587 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2588 message_id[6] = '-';
2589 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2590
2591 /* Deal with the case where the host number is set. The value of the number was
2592 checked when it was read, to ensure it isn't too big. The timing granularity is
2593 left in id_resolution so that an appropriate wait can be done after receiving
2594 the message, if necessary (we hope it won't be). */
2595
2596 if (host_number_string != NULL)
2597 {
2598 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2599 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2600 string_base62((long int)(
2601 host_number * (1000000/id_resolution) +
2602 message_id_tv.tv_usec/id_resolution)) + 4);
2603 }
2604
2605 /* Host number not set: final field is just the fractional time at an
2606 appropriate resolution. */
2607
2608 else
2609 {
2610 id_resolution = (BASE_62 == 62)? 500 : 1000;
2611 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2612 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2613 }
2614
2615 /* Add the current message id onto the current process info string if
2616 it will fit. */
2617
2618 (void)string_format(process_info + process_info_len,
2619 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2620
2621 /* If we are using multiple input directories, set up the one for this message
2622 to be the least significant base-62 digit of the time of arrival. Otherwise
2623 ensure that it is an empty string. */
2624
2625 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2626
2627 /* Now that we have the message-id, if there is no message-id: header, generate
2628 one, but only for local (without suppress_local_fixups) or submission mode
2629 messages. This can be user-configured if required, but we had better flatten
2630 any illegal characters therein. */
2631
2632 if (msgid_header == NULL &&
2633 ((sender_host_address == NULL && !suppress_local_fixups)
2634 || submission_mode))
2635 {
2636 uschar *p;
2637 uschar *id_text = US"";
2638 uschar *id_domain = primary_hostname;
2639
2640 /* Permit only letters, digits, dots, and hyphens in the domain */
2641
2642 if (message_id_domain != NULL)
2643 {
2644 uschar *new_id_domain = expand_string(message_id_domain);
2645 if (new_id_domain == NULL)
2646 {
2647 if (!expand_string_forcedfail)
2648 log_write(0, LOG_MAIN|LOG_PANIC,
2649 "expansion of \"%s\" (message_id_header_domain) "
2650 "failed: %s", message_id_domain, expand_string_message);
2651 }
2652 else if (*new_id_domain != 0)
2653 {
2654 id_domain = new_id_domain;
2655 for (p = id_domain; *p != 0; p++)
2656 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2657 }
2658 }
2659
2660 /* Permit all characters except controls and RFC 2822 specials in the
2661 additional text part. */
2662
2663 if (message_id_text != NULL)
2664 {
2665 uschar *new_id_text = expand_string(message_id_text);
2666 if (new_id_text == NULL)
2667 {
2668 if (!expand_string_forcedfail)
2669 log_write(0, LOG_MAIN|LOG_PANIC,
2670 "expansion of \"%s\" (message_id_header_text) "
2671 "failed: %s", message_id_text, expand_string_message);
2672 }
2673 else if (*new_id_text != 0)
2674 {
2675 id_text = new_id_text;
2676 for (p = id_text; *p != 0; p++)
2677 if (mac_iscntrl_or_special(*p)) *p = '-';
2678 }
2679 }
2680
2681 /* Add the header line
2682 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2683 * appended, to preserve classical expectations of header ordering. */
2684
2685 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2686 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2687 (*id_text == 0)? "" : ".", id_text, id_domain);
2688 }
2689
2690 /* If we are to log recipients, keep a copy of the raw ones before any possible
2691 rewriting. Must copy the count, because later ACLs and the local_scan()
2692 function may mess with the real recipients. */
2693
2694 if (LOGGING(received_recipients))
2695 {
2696 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2697 for (i = 0; i < recipients_count; i++)
2698 raw_recipients[i] = string_copy(recipients_list[i].address);
2699 raw_recipients_count = recipients_count;
2700 }
2701
2702 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2703 recipients will get here only if the conditions were right (allow_unqualified_
2704 recipient is TRUE). */
2705
2706 for (i = 0; i < recipients_count; i++)
2707 recipients_list[i].address =
2708 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2709 global_rewrite_rules, rewrite_existflags);
2710
2711 /* If there is no From: header, generate one for local (without
2712 suppress_local_fixups) or submission_mode messages. If there is no sender
2713 address, but the sender is local or this is a local delivery error, use the
2714 originator login. This shouldn't happen for genuine bounces, but might happen
2715 for autoreplies. The addition of From: must be done *before* checking for the
2716 possible addition of a Sender: header, because untrusted_set_sender allows an
2717 untrusted user to set anything in the envelope (which might then get info
2718 From:) but we still want to ensure a valid Sender: if it is required. */
2719
2720 if (from_header == NULL &&
2721 ((sender_host_address == NULL && !suppress_local_fixups)
2722 || submission_mode))
2723 {
2724 uschar *oname = US"";
2725
2726 /* Use the originator_name if this is a locally submitted message and the
2727 caller is not trusted. For trusted callers, use it only if -F was used to
2728 force its value or if we have a non-SMTP message for which -f was not used
2729 to set the sender. */
2730
2731 if (sender_host_address == NULL)
2732 {
2733 if (!trusted_caller || sender_name_forced ||
2734 (!smtp_input && !sender_address_forced))
2735 oname = originator_name;
2736 }
2737
2738 /* For non-locally submitted messages, the only time we use the originator
2739 name is when it was forced by the /name= option on control=submission. */
2740
2741 else
2742 {
2743 if (submission_name != NULL) oname = submission_name;
2744 }
2745
2746 /* Envelope sender is empty */
2747
2748 if (sender_address[0] == 0)
2749 {
2750 uschar *fromstart, *fromend;
2751
2752 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2753 oname, (oname[0] == 0)? "" : " <");
2754 fromend = (oname[0] == 0)? US"" : US">";
2755
2756 if (sender_local || local_error_message)
2757 {
2758 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2759 local_part_quote(originator_login), qualify_domain_sender,
2760 fromend);
2761 }
2762 else if (submission_mode && authenticated_id != NULL)
2763 {
2764 if (submission_domain == NULL)
2765 {
2766 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2767 local_part_quote(authenticated_id), qualify_domain_sender,
2768 fromend);
2769 }
2770 else if (submission_domain[0] == 0) /* empty => whole address set */
2771 {
2772 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2773 fromend);
2774 }
2775 else
2776 {
2777 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2778 local_part_quote(authenticated_id), submission_domain,
2779 fromend);
2780 }
2781 from_header = header_last; /* To get it checked for Sender: */
2782 }
2783 }
2784
2785 /* There is a non-null envelope sender. Build the header using the original
2786 sender address, before any rewriting that might have been done while
2787 verifying it. */
2788
2789 else
2790 {
2791 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2792 oname,
2793 (oname[0] == 0)? "" : " <",
2794 (sender_address_unrewritten == NULL)?
2795 sender_address : sender_address_unrewritten,
2796 (oname[0] == 0)? "" : ">");
2797
2798 from_header = header_last; /* To get it checked for Sender: */
2799 }
2800 }
2801
2802
2803 /* If the sender is local (without suppress_local_fixups), or if we are in
2804 submission mode and there is an authenticated_id, check that an existing From:
2805 is correct, and if not, generate a Sender: header, unless disabled. Any
2806 previously-existing Sender: header was removed above. Note that sender_local,
2807 as well as being TRUE if the caller of exim is not trusted, is also true if a
2808 trusted caller did not supply a -f argument for non-smtp input. To allow
2809 trusted callers to forge From: without supplying -f, we have to test explicitly
2810 here. If the From: header contains more than one address, then the call to
2811 parse_extract_address fails, and a Sender: header is inserted, as required. */
2812
2813 if (from_header != NULL &&
2814 (active_local_from_check &&
2815 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2816 (submission_mode && authenticated_id != NULL))
2817 ))
2818 {
2819 BOOL make_sender = TRUE;
2820 int start, end, domain;
2821 uschar *errmess;
2822 uschar *from_address =
2823 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2824 &start, &end, &domain, FALSE);
2825 uschar *generated_sender_address;
2826
2827 if (submission_mode)
2828 {
2829 if (submission_domain == NULL)
2830 {
2831 generated_sender_address = string_sprintf("%s@%s",
2832 local_part_quote(authenticated_id), qualify_domain_sender);
2833 }
2834 else if (submission_domain[0] == 0) /* empty => full address */
2835 {
2836 generated_sender_address = string_sprintf("%s",
2837 authenticated_id);
2838 }
2839 else
2840 {
2841 generated_sender_address = string_sprintf("%s@%s",
2842 local_part_quote(authenticated_id), submission_domain);
2843 }
2844 }
2845 else
2846 generated_sender_address = string_sprintf("%s@%s",
2847 local_part_quote(originator_login), qualify_domain_sender);
2848
2849 /* Remove permitted prefixes and suffixes from the local part of the From:
2850 address before doing the comparison with the generated sender. */
2851
2852 if (from_address != NULL)
2853 {
2854 int slen;
2855 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2856
2857 if (at != NULL) *at = 0;
2858 from_address += route_check_prefix(from_address, local_from_prefix);
2859 slen = route_check_suffix(from_address, local_from_suffix);
2860 if (slen > 0)
2861 {
2862 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2863 from_address += slen;
2864 }
2865 if (at != NULL) *at = '@';
2866
2867 if (strcmpic(generated_sender_address, from_address) == 0 ||
2868 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2869 make_sender = FALSE;
2870 }
2871
2872 /* We have to cause the Sender header to be rewritten if there are
2873 appropriate rewriting rules. */
2874
2875 if (make_sender)
2876 {
2877 if (submission_mode && submission_name == NULL)
2878 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2879 generated_sender_address);
2880 else
2881 header_add(htype_sender, "%sSender: %s <%s>\n",
2882 resent_prefix,
2883 submission_mode? submission_name : originator_name,
2884 generated_sender_address);
2885 }
2886
2887 /* Ensure that a non-null envelope sender address corresponds to the
2888 submission mode sender address. */
2889
2890 if (submission_mode && sender_address[0] != 0)
2891 {
2892 if (sender_address_unrewritten == NULL)
2893 sender_address_unrewritten = sender_address;
2894 sender_address = generated_sender_address;
2895 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2896 log_write(L_address_rewrite, LOG_MAIN,
2897 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2898 sender_address_unrewritten, generated_sender_address);
2899 }
2900 }
2901
2902 /* If there are any rewriting rules, apply them to the sender address, unless
2903 it has already been rewritten as part of verification for SMTP input. */
2904
2905 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2906 sender_address[0] != 0)
2907 {
2908 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2909 global_rewrite_rules, rewrite_existflags);
2910 DEBUG(D_receive|D_rewrite)
2911 debug_printf("rewritten sender = %s\n", sender_address);
2912 }
2913
2914
2915 /* The headers must be run through rewrite_header(), because it ensures that
2916 addresses are fully qualified, as well as applying any rewriting rules that may
2917 exist.
2918
2919 Qualification of header addresses in a message from a remote host happens only
2920 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2921 appropriate. For local messages, qualification always happens, unless -bnq is
2922 used to explicitly suppress it. No rewriting is done for an unqualified address
2923 that is left untouched.
2924
2925 We start at the second header, skipping our own Received:. This rewriting is
2926 documented as happening *after* recipient addresses are taken from the headers
2927 by the -t command line option. An added Sender: gets rewritten here. */
2928
2929 for (h = header_list->next; h; h = h->next)
2930 {
2931 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2932 rewrite_existflags, TRUE);
2933 if (newh) h = newh;
2934 }
2935
2936
2937 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2938 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2939 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2940 exists, this applies to the set of resent- headers rather than the normal set.
2941
2942 The requirement for a recipient header has been removed in RFC 2822. At this
2943 point in the code, earlier versions of Exim added a To: header for locally
2944 submitted messages, and an empty Bcc: header for others. In the light of the
2945 changes in RFC 2822, this was dropped in November 2003. */
2946
2947
2948 /* If there is no date header, generate one if the message originates locally
2949 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2950 submission mode flag is set. Messages without Date: are not valid, but it seems
2951 to be more confusing if Exim adds one to all remotely-originated messages.
2952 As per Message-Id, we prepend if resending, else append.
2953 */
2954
2955 if (!date_header_exists &&
2956 ((sender_host_address == NULL && !suppress_local_fixups)
2957 || submission_mode))
2958 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2959 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2960
2961 search_tidyup(); /* Free any cached resources */
2962
2963 /* Show the complete set of headers if debugging. Note that the first one (the
2964 new Received:) has not yet been set. */
2965
2966 DEBUG(D_receive)
2967 {
2968 debug_printf(">>Headers after rewriting and local additions:\n");
2969 for (h = header_list->next; h != NULL; h = h->next)
2970 debug_printf("%c %s", h->type, h->text);
2971 debug_printf("\n");
2972 }
2973
2974 /* The headers are now complete in store. If we are running in filter
2975 testing mode, that is all this function does. Return TRUE if the message
2976 ended with a dot. */
2977
2978 if (filter_test != FTEST_NONE)
2979 {
2980 process_info[process_info_len] = 0;
2981 return message_ended == END_DOT;
2982 }
2983
2984 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2985 think more if it could be handled. Cannot do onward CHUNKING unless
2986 inbound is, but inbound chunking ought to be ok with outbound plain.
2987 Could we do onward CHUNKING given inbound CHUNKING?
2988 */
2989 if (chunking_state > CHUNKING_OFFERED)
2990 cancel_cutthrough_connection(FALSE, US"chunking active");
2991
2992 /* Cutthrough delivery:
2993 We have to create the Received header now rather than at the end of reception,
2994 so the timestamp behaviour is a change to the normal case.
2995 XXX Ensure this gets documented XXX.
2996 Having created it, send the headers to the destination. */
2997
2998 if (cutthrough.fd >= 0 && cutthrough.delivery)
2999 {
3000 if (received_count > received_headers_max)
3001 {
3002 cancel_cutthrough_connection(TRUE, US"too many headers");
3003 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3004 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3005 "Too many \"Received\" headers",
3006 sender_address,
3007 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3008 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3009 message_id[0] = 0; /* Indicate no message accepted */
3010 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3011 goto TIDYUP; /* Skip to end of function */
3012 }
3013 received_header_gen();
3014 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3015 (void) cutthrough_headers_send();
3016 }
3017
3018
3019 /* Open a new spool file for the data portion of the message. We need
3020 to access it both via a file descriptor and a stream. Try to make the
3021 directory if it isn't there. */
3022
3023 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3024 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3025
3026 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3027 {
3028 if (errno == ENOENT)
3029 {
3030 (void) directory_make(spool_directory,
3031 spool_sname(US"input", message_subdir),
3032 INPUT_DIRECTORY_MODE, TRUE);
3033 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3034 }
3035 if (data_fd < 0)
3036 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3037 spool_name, strerror(errno));
3038 }
3039
3040 /* Make sure the file's group is the Exim gid, and double-check the mode
3041 because the group setting doesn't always get set automatically. */
3042
3043 if (fchown(data_fd, exim_uid, exim_gid))
3044 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3045 "Failed setting ownership on spool file %s: %s",
3046 spool_name, strerror(errno));
3047 (void)fchmod(data_fd, SPOOL_MODE);
3048
3049 /* We now have data file open. Build a stream for it and lock it. We lock only
3050 the first line of the file (containing the message ID) because otherwise there
3051 are problems when Exim is run under Cygwin (I'm told). See comments in
3052 spool_in.c, where the same locking is done. */
3053
3054 data_file = fdopen(data_fd, "w+");
3055 lock_data.l_type = F_WRLCK;
3056 lock_data.l_whence = SEEK_SET;
3057 lock_data.l_start = 0;
3058 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3059
3060 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3061 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3062 errno, strerror(errno));
3063
3064 /* We have an open, locked data file. Write the message id to it to make it
3065 self-identifying. Then read the remainder of the input of this message and
3066 write it to the data file. If the variable next != NULL, it contains the first
3067 data line (which was read as a header but then turned out not to have the right
3068 format); write it (remembering that it might contain binary zeros). The result
3069 of fwrite() isn't inspected; instead we call ferror() below. */
3070
3071 fprintf(data_file, "%s-D\n", message_id);
3072 if (next != NULL)
3073 {
3074 uschar *s = next->text;
3075 int len = next->slen;
3076 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3077 body_linecount++; /* Assumes only 1 line */
3078 }
3079
3080 /* Note that we might already be at end of file, or the logical end of file
3081 (indicated by '.'), or might have encountered an error while writing the
3082 message id or "next" line. */
3083
3084 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3085 {
3086 if (smtp_input)
3087 {
3088 message_ended = chunking_state > CHUNKING_OFFERED
3089 ? read_message_bdat_smtp(data_file)
3090 : read_message_data_smtp(data_file);
3091 receive_linecount++; /* The terminating "." line */
3092 }
3093 else message_ended = read_message_data(data_file);
3094
3095 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3096 message_linecount += body_linecount;
3097
3098 switch (message_ended)
3099 {
3100 /* Handle premature termination of SMTP */
3101
3102 case END_EOF:
3103 if (smtp_input)
3104 {
3105 Uunlink(spool_name); /* Lose data file when closed */
3106 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3107 message_id[0] = 0; /* Indicate no message accepted */
3108 smtp_reply = handle_lost_connection(US"");
3109 smtp_yield = FALSE;
3110 goto TIDYUP; /* Skip to end of function */
3111 }
3112 break;
3113
3114 /* Handle message that is too big. Don't use host_or_ident() in the log
3115 message; we want to see the ident value even for non-remote messages. */
3116
3117 case END_SIZE:
3118 Uunlink(spool_name); /* Lose the data file when closed */
3119 cancel_cutthrough_connection(TRUE, US"mail too big");
3120 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3121
3122 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3123 "message too big: read=%d max=%d",
3124 sender_address,
3125 (sender_fullhost == NULL)? "" : " H=",
3126 (sender_fullhost == NULL)? US"" : sender_fullhost,
3127 (sender_ident == NULL)? "" : " U=",
3128 (sender_ident == NULL)? US"" : sender_ident,
3129 message_size,
3130 thismessage_size_limit);
3131
3132 if (smtp_input)
3133 {
3134 smtp_reply = US"552 Message size exceeds maximum permitted";
3135 message_id[0] = 0; /* Indicate no message accepted */
3136 goto TIDYUP; /* Skip to end of function */
3137 }
3138 else
3139 {
3140 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3141 give_local_error(ERRMESS_TOOBIG,
3142 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3143 US"message rejected: ", error_rc, data_file, header_list);
3144 /* Does not return */
3145 }
3146 break;
3147
3148 /* Handle bad BDAT protocol sequence */
3149
3150 case END_PROTOCOL:
3151 Uunlink(spool_name); /* Lose the data file when closed */
3152 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3153 smtp_reply = US""; /* Response already sent */
3154 message_id[0] = 0; /* Indicate no message accepted */
3155 goto TIDYUP; /* Skip to end of function */
3156 }
3157 }
3158
3159 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3160 example, there may be some expansion in an ACL that uses a timer.) */
3161
3162 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3163
3164 /* The message body has now been read into the data file. Call fflush() to
3165 empty the buffers in C, and then call fsync() to get the data written out onto
3166 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3167 having to do this). If there was an I/O error on either input or output,
3168 attempt to send an error message, and unlink the spool file. For non-SMTP input
3169 we can then give up. Note that for SMTP input we must swallow the remainder of
3170 the input in cases of output errors, since the far end doesn't expect to see
3171 anything until the terminating dot line is sent. */
3172
3173 if (fflush(data_file) == EOF || ferror(data_file) ||
3174 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3175 {
3176 uschar *msg_errno = US strerror(errno);
3177 BOOL input_error = (receive_ferror)() != 0;
3178 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3179 input_error? "Input read" : "Spool write",
3180 msg_errno,
3181 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3182
3183 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3184 Uunlink(spool_name); /* Lose the data file */
3185 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3186
3187 if (smtp_input)
3188 {
3189 if (input_error)
3190 smtp_reply = US"451 Error while reading input data";
3191 else
3192 {
3193 smtp_reply = US"451 Error while writing spool file";
3194 receive_swallow_smtp();
3195 }
3196 message_id[0] = 0; /* Indicate no message accepted */
3197 goto TIDYUP; /* Skip to end of function */
3198 }
3199
3200 else
3201 {
3202 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3203 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3204 header_list);
3205 /* Does not return */
3206 }
3207 }
3208
3209
3210 /* No I/O errors were encountered while writing the data file. */
3211
3212 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3213
3214
3215 /* If there were any bad addresses extracted by -t, or there were no recipients
3216 left after -t, send a message to the sender of this message, or write it to
3217 stderr if the error handling option is set that way. Note that there may
3218 legitimately be no recipients for an SMTP message if they have all been removed
3219 by "discard".
3220
3221 We need to rewind the data file in order to read it. In the case of no
3222 recipients or stderr error writing, throw the data file away afterwards, and
3223 exit. (This can't be SMTP, which always ensures there's at least one
3224 syntactically good recipient address.) */
3225
3226 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3227 {
3228 DEBUG(D_receive)
3229 {
3230 if (recipients_count == 0) debug_printf("*** No recipients\n");
3231 if (bad_addresses != NULL)
3232 {
3233 error_block *eblock = bad_addresses;
3234 debug_printf("*** Bad address(es)\n");
3235 while (eblock != NULL)
3236 {
3237 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3238 eblock = eblock->next;
3239 }
3240 }
3241 }
3242
3243 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3244
3245 /* If configured to send errors to the sender, but this fails, force
3246 a failure error code. We use a special one for no recipients so that it
3247 can be detected by the autoreply transport. Otherwise error_rc is set to
3248 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3249 it is EXIT_SUCCESS. */
3250
3251 if (error_handling == ERRORS_SENDER)
3252 {
3253 if (!moan_to_sender(
3254 (bad_addresses == NULL)?
3255 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3256 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3257 bad_addresses, header_list, data_file, FALSE))
3258 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3259 }
3260 else
3261 {
3262 if (bad_addresses == NULL)
3263 {
3264 if (extracted_ignored)
3265 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3266 else
3267 fprintf(stderr, "exim: no recipients in message\n");
3268 }
3269 else
3270 {
3271 fprintf(stderr, "exim: invalid address%s",
3272 (bad_addresses->next == NULL)? ":" : "es:\n");
3273 while (bad_addresses != NULL)
3274 {
3275 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3276 bad_addresses->text2);
3277 bad_addresses = bad_addresses->next;
3278 }
3279 }
3280 }
3281
3282 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3283 {
3284 Uunlink(spool_name);
3285 (void)fclose(data_file);
3286 exim_exit(error_rc);
3287 }
3288 }
3289
3290 /* Data file successfully written. Generate text for the Received: header by
3291 expanding the configured string, and adding a timestamp. By leaving this
3292 operation till now, we ensure that the timestamp is the time that message
3293 reception was completed. However, this is deliberately done before calling the
3294 data ACL and local_scan().
3295
3296 This Received: header may therefore be inspected by the data ACL and by code in
3297 the local_scan() function. When they have run, we update the timestamp to be
3298 the final time of reception.
3299
3300 If there is just one recipient, set up its value in the $received_for variable
3301 for use when we generate the Received: header.
3302
3303 Note: the checking for too many Received: headers is handled by the delivery
3304 code. */
3305 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3306
3307 if (received_header->text == NULL) /* Non-cutthrough case */
3308 {
3309 received_header_gen();
3310
3311 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3312
3313 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3314 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3315
3316 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3317 now, before running the DATA ACL. */
3318
3319 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3320 }
3321 else
3322 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3323 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3324
3325 /* If an ACL is specified for checking things at this stage of reception of a
3326 message, run it, unless all the recipients were removed by "discard" in earlier
3327 ACLs. That is the only case in which recipients_count can be zero at this
3328 stage. Set deliver_datafile to point to the data file so that $message_body and
3329 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3330 */
3331
3332 deliver_datafile = data_fd;
3333 user_msg = NULL;
3334
3335 enable_dollar_recipients = TRUE;
3336
3337 if (recipients_count == 0)
3338 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3339
3340 else
3341 {
3342 /* Handle interactive SMTP messages */
3343
3344 if (smtp_input && !smtp_batched_input)
3345 {
3346
3347 #ifndef DISABLE_DKIM
3348 if (!dkim_disable_verify)
3349 {
3350 /* Finish verification, this will log individual signature results to
3351 the mainlog */
3352 dkim_exim_verify_finish();
3353
3354 /* Check if we must run the DKIM ACL */
3355 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3356 {
3357 uschar *dkim_verify_signers_expanded =
3358 expand_string(dkim_verify_signers);
3359 if (!dkim_verify_signers_expanded)
3360 log_write(0, LOG_MAIN|LOG_PANIC,
3361 "expansion of dkim_verify_signers option failed: %s",
3362 expand_string_message);
3363
3364 else
3365 {
3366 int sep = 0;
3367 const uschar *ptr = dkim_verify_signers_expanded;
3368 uschar *item = NULL;
3369 uschar *seen_items = NULL;
3370 int seen_items_size = 0;
3371 int seen_items_offset = 0;
3372 /* Default to OK when no items are present */
3373 rc = OK;
3374 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3375 {
3376 /* Prevent running ACL for an empty item */
3377 if (!item || !*item) continue;
3378
3379 /* Only run ACL once for each domain or identity,
3380 no matter how often it appears in the expanded list. */
3381 if (seen_items)
3382 {
3383 uschar *seen_item = NULL;
3384 const uschar *seen_items_list = seen_items;
3385 BOOL seen_this_item = FALSE;
3386
3387 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3388 NULL, 0)))
3389 if (Ustrcmp(seen_item,item) == 0)
3390 {
3391 seen_this_item = TRUE;
3392 break;
3393 }
3394
3395 if (seen_this_item)
3396 {
3397 DEBUG(D_receive)
3398 debug_printf("acl_smtp_dkim: skipping signer %s, "
3399 "already seen\n", item);
3400 continue;
3401 }
3402
3403 seen_items = string_append(seen_items, &seen_items_size,
3404 &seen_items_offset, 1, ":");
3405 }
3406
3407 seen_items = string_append(seen_items, &seen_items_size,
3408 &seen_items_offset, 1, item);
3409 seen_items[seen_items_offset] = '\0';
3410
3411 DEBUG(D_receive)
3412 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3413 item);
3414
3415 dkim_exim_acl_setup(item);
3416 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3417 &user_msg, &log_msg);
3418
3419 if (rc != OK)
3420 {
3421 DEBUG(D_receive)
3422 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3423 "skipping remaining items\n", rc, item);
3424 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3425 break;
3426 }
3427 }
3428 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3429 if (rc == DISCARD)
3430 {
3431 recipients_count = 0;
3432 blackholed_by = US"DKIM ACL";
3433 if (log_msg != NULL)
3434 blackhole_log_msg = string_sprintf(": %s", log_msg);
3435 }
3436 else if (rc != OK)
3437 {
3438 Uunlink(spool_name);
3439 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3440 smtp_yield = FALSE; /* No more messages after dropped connection */
3441 smtp_reply = US""; /* Indicate reply already sent */
3442 message_id[0] = 0; /* Indicate no message accepted */
3443 goto TIDYUP; /* Skip to end of function */
3444 }
3445 }
3446 }
3447 }
3448 #endif /* DISABLE_DKIM */
3449
3450 #ifdef WITH_CONTENT_SCAN
3451 if (recipients_count > 0 &&
3452 acl_smtp_mime != NULL &&
3453 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3454 goto TIDYUP;
3455 #endif /* WITH_CONTENT_SCAN */
3456
3457 #ifdef EXPERIMENTAL_DMARC
3458 dmarc_up = dmarc_store_data(from_header);
3459 #endif /* EXPERIMENTAL_DMARC */
3460
3461 #ifndef DISABLE_PRDR
3462 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3463 {
3464 unsigned int c;
3465 int all_pass = OK;
3466 int all_fail = FAIL;
3467
3468 smtp_printf("353 PRDR content analysis beginning\r\n");
3469 /* Loop through recipients, responses must be in same order received */
3470 for (c = 0; recipients_count > c; c++)
3471 {
3472 uschar * addr= recipients_list[c].address;
3473 uschar * msg= US"PRDR R=<%s> %s";
3474 uschar * code;
3475 DEBUG(D_receive)
3476 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3477 addr, c+1, recipients_count);
3478 rc = acl_check(ACL_WHERE_PRDR, addr,
3479 acl_smtp_data_prdr, &user_msg, &log_msg);
3480
3481 /* If any recipient rejected content, indicate it in final message */
3482 all_pass |= rc;
3483 /* If all recipients rejected, indicate in final message */
3484 all_fail &= rc;
3485
3486 switch (rc)
3487 {
3488 case OK: case DISCARD: code = US"250"; break;
3489 case DEFER: code = US"450"; break;
3490 default: code = US"550"; break;
3491 }
3492 if (user_msg != NULL)
3493 smtp_user_msg(code, user_msg);
3494 else
3495 {
3496 switch (rc)
3497 {
3498 case OK: case DISCARD:
3499 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3500 case DEFER:
3501 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3502 default:
3503 msg = string_sprintf(CS msg, addr, "refusal"); break;
3504 }
3505 smtp_user_msg(code, msg);
3506 }
3507 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3508 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3509 else log_write(0, LOG_MAIN, "%s", CS msg);
3510
3511 if (rc != OK) { receive_remove_recipient(addr); c--; }
3512 }
3513 /* Set up final message, used if data acl gives OK */
3514 smtp_reply = string_sprintf("%s id=%s message %s",
3515 all_fail == FAIL ? US"550" : US"250",
3516 message_id,
3517 all_fail == FAIL
3518 ? US"rejected for all recipients"
3519 : all_pass == OK
3520 ? US"accepted"
3521 : US"accepted for some recipients");
3522 if (recipients_count == 0)
3523 {
3524 message_id[0] = 0; /* Indicate no message accepted */
3525 goto TIDYUP;
3526 }
3527 }
3528 else
3529 prdr_requested = FALSE;
3530 #endif /* !DISABLE_PRDR */
3531
3532 /* Check the recipients count again, as the MIME ACL might have changed
3533 them. */
3534
3535 if (acl_smtp_data != NULL && recipients_count > 0)
3536 {
3537 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3538 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3539 if (rc == DISCARD)
3540 {
3541 recipients_count = 0;
3542 blackholed_by = US"DATA ACL";
3543 if (log_msg)
3544 blackhole_log_msg = string_sprintf(": %s", log_msg);
3545 cancel_cutthrough_connection(TRUE, US"data acl discard");
3546 }
3547 else if (rc != OK)
3548 {
3549 Uunlink(spool_name);
3550 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3551 #ifdef WITH_CONTENT_SCAN
3552 unspool_mbox();
3553 #endif
3554 #ifdef EXPERIMENTAL_DCC
3555 dcc_ok = 0;
3556 #endif
3557 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3558 smtp_yield = FALSE; /* No more messages after dropped connection */
3559 smtp_reply = US""; /* Indicate reply already sent */
3560 message_id[0] = 0; /* Indicate no message accepted */
3561 goto TIDYUP; /* Skip to end of function */
3562 }
3563 }
3564 }
3565
3566 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3567 we cannot take different actions for permanent and temporary rejections. */
3568
3569 else
3570 {
3571
3572 #ifdef WITH_CONTENT_SCAN
3573 if (acl_not_smtp_mime != NULL &&
3574 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3575 &blackholed_by))
3576 goto TIDYUP;
3577 #endif /* WITH_CONTENT_SCAN */
3578
3579 if (acl_not_smtp != NULL)
3580 {
3581 uschar *user_msg, *log_msg;
3582 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3583 if (rc == DISCARD)
3584 {
3585 recipients_count = 0;
3586 blackholed_by = US"non-SMTP ACL";
3587 if (log_msg != NULL)
3588 blackhole_log_msg = string_sprintf(": %s", log_msg);
3589 }
3590 else if (rc != OK)
3591 {
3592 Uunlink(spool_name);
3593 #ifdef WITH_CONTENT_SCAN
3594 unspool_mbox();
3595 #endif
3596 #ifdef EXPERIMENTAL_DCC
3597 dcc_ok = 0;
3598 #endif
3599 /* The ACL can specify where rejections are to be logged, possibly
3600 nowhere. The default is main and reject logs. */
3601
3602 if (log_reject_target != 0)
3603 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3604 sender_address, log_msg);
3605
3606 if (user_msg == NULL) user_msg = US"local configuration problem";
3607 if (smtp_batched_input)
3608 {
3609 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3610 /* Does not return */
3611 }
3612 else
3613 {
3614 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3615 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3616 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3617 header_list);
3618 /* Does not return */
3619 }
3620 }
3621 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3622 }
3623 }
3624
3625 /* The applicable ACLs have been run */
3626
3627 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3628 if (queue_only_policy) queued_by = US"ACL";
3629 }
3630
3631 #ifdef WITH_CONTENT_SCAN
3632 unspool_mbox();
3633 #endif
3634
3635 #ifdef EXPERIMENTAL_DCC
3636 dcc_ok = 0;
3637 #endif
3638
3639
3640 /* The final check on the message is to run the scan_local() function. The
3641 version supplied with Exim always accepts, but this is a hook for sysadmins to
3642 supply their own checking code. The local_scan() function is run even when all
3643 the recipients have been discarded. */
3644
3645 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3646
3647 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3648 deleted, and the incident gets logged. */
3649
3650 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3651 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3652 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3653 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3654
3655 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3656 local_scan_timeout);
3657 local_scan_data = NULL;
3658
3659 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3660 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3661 rc = local_scan(data_fd, &local_scan_data);
3662 alarm(0);
3663 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3664
3665 enable_dollar_recipients = FALSE;
3666
3667 store_pool = POOL_MAIN; /* In case changed */
3668 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3669 local_scan_data);
3670
3671 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3672 os_non_restarting_signal(SIGFPE, SIG_DFL);
3673 os_non_restarting_signal(SIGILL, SIG_DFL);
3674 os_non_restarting_signal(SIGBUS, SIG_DFL);
3675
3676 /* The length check is paranoia against some runaway code, and also because
3677 (for a success return) lines in the spool file are read into big_buffer. */
3678
3679 if (local_scan_data != NULL)
3680 {
3681 int len = Ustrlen(local_scan_data);
3682 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3683 local_scan_data = string_copyn(local_scan_data, len);
3684 }
3685
3686 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3687 {
3688 if (!deliver_freeze) /* ACL might have already frozen */
3689 {
3690 deliver_freeze = TRUE;
3691 deliver_frozen_at = time(NULL);
3692 frozen_by = US"local_scan()";
3693 }
3694 rc = LOCAL_SCAN_ACCEPT;
3695 }
3696 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3697 {
3698 if (!queue_only_policy) /* ACL might have already queued */
3699 {
3700 queue_only_policy = TRUE;
3701 queued_by = US"local_scan()";
3702 }
3703 rc = LOCAL_SCAN_ACCEPT;
3704 }
3705
3706 /* Message accepted: remove newlines in local_scan_data because otherwise
3707 the spool file gets corrupted. Ensure that all recipients are qualified. */
3708
3709 if (rc == LOCAL_SCAN_ACCEPT)
3710 {
3711 if (local_scan_data != NULL)
3712 {
3713 uschar *s;
3714 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3715 }
3716 for (i = 0; i < recipients_count; i++)
3717 {
3718 recipient_item *r = recipients_list + i;
3719 r->address = rewrite_address_qualify(r->address, TRUE);
3720 if (r->errors_to != NULL)
3721 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3722 }
3723 if (recipients_count == 0 && blackholed_by == NULL)
3724 blackholed_by = US"local_scan";
3725 }
3726
3727 /* Message rejected: newlines permitted in local_scan_data to generate
3728 multiline SMTP responses. */
3729
3730 else
3731 {
3732 uschar *istemp = US"";
3733 uschar *s = NULL;
3734 uschar *smtp_code;
3735 int size = 0;
3736 int sptr = 0;
3737
3738 errmsg = local_scan_data;
3739
3740 Uunlink(spool_name); /* Cancel this message */
3741 switch(rc)
3742 {
3743 default:
3744 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3745 "rejection given", rc);
3746 goto TEMPREJECT;
3747
3748 case LOCAL_SCAN_REJECT_NOLOGHDR:
3749 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3750 /* Fall through */
3751
3752 case LOCAL_SCAN_REJECT:
3753 smtp_code = US"550";
3754 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3755 break;
3756
3757 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3758 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3759 /* Fall through */
3760
3761 case LOCAL_SCAN_TEMPREJECT:
3762 TEMPREJECT:
3763 smtp_code = US"451";
3764 if (errmsg == NULL) errmsg = US"Temporary local problem";
3765 istemp = US"temporarily ";
3766 break;
3767 }
3768
3769 s = string_append(s, &size, &sptr, 2, US"F=",
3770 (sender_address[0] == 0)? US"<>" : sender_address);
3771 s = add_host_info_for_log(s, &size, &sptr);
3772 s[sptr] = 0;
3773
3774 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3775 s, istemp, string_printing(errmsg));
3776
3777 if (smtp_input)
3778 {
3779 if (!smtp_batched_input)
3780 {
3781 smtp_respond(smtp_code, 3, TRUE, errmsg);
3782 message_id[0] = 0; /* Indicate no message accepted */
3783 smtp_reply = US""; /* Indicate reply already sent */
3784 goto TIDYUP; /* Skip to end of function */
3785 }
3786 else
3787 {
3788 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3789 /* Does not return */
3790 }
3791 }
3792 else
3793 {
3794 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3795 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3796 US"message rejected by local scan code: ", error_rc, data_file,
3797 header_list);
3798 /* Does not return */
3799 }
3800 }
3801
3802 /* Reset signal handlers to ignore signals that previously would have caused
3803 the message to be abandoned. */
3804
3805 signal(SIGTERM, SIG_IGN);
3806 signal(SIGINT, SIG_IGN);
3807
3808
3809 /* Ensure the first time flag is set in the newly-received message. */
3810
3811 deliver_firsttime = TRUE;
3812
3813 #ifdef EXPERIMENTAL_BRIGHTMAIL
3814 if (bmi_run == 1)
3815 { /* rewind data file */
3816 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3817 bmi_verdicts = bmi_process_message(header_list, data_fd);
3818 }
3819 #endif
3820
3821 /* Update the timestamp in our Received: header to account for any time taken by
3822 an ACL or by local_scan(). The new time is the time that all reception
3823 processing is complete. */
3824
3825 timestamp = expand_string(US"${tod_full}");
3826 tslen = Ustrlen(timestamp);
3827
3828 memcpy(received_header->text + received_header->slen - tslen - 1,
3829 timestamp, tslen);
3830
3831 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3832
3833 if (mua_wrapper)
3834 {
3835 deliver_freeze = FALSE;
3836 queue_only_policy = FALSE;
3837 }
3838
3839 /* Keep the data file open until we have written the header file, in order to
3840 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3841 don't write the header file, and we unlink the data file. If writing the header
3842 file fails, we have failed to accept this message. */
3843
3844 if (host_checking || blackholed_by != NULL)
3845 {
3846 header_line *h;
3847 Uunlink(spool_name);
3848 msg_size = 0; /* Compute size for log line */
3849 for (h = header_list; h != NULL; h = h->next)
3850 if (h->type != '*') msg_size += h->slen;
3851 }
3852
3853 /* Write the -H file */
3854
3855 else
3856 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3857 {
3858 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3859 Uunlink(spool_name); /* Lose the data file */
3860
3861 if (smtp_input)
3862 {
3863 smtp_reply = US"451 Error in writing spool file";
3864 message_id[0] = 0; /* Indicate no message accepted */
3865 goto TIDYUP;
3866 }
3867 else
3868 {
3869 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3870 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3871 header_list);
3872 /* Does not return */
3873 }
3874 }
3875
3876
3877 /* The message has now been successfully received. */
3878
3879 receive_messagecount++;
3880
3881 /* In SMTP sessions we may receive several in one connection. After each one,
3882 we wait for the clock to tick at the level of message-id granularity. This is
3883 so that the combination of time+pid is unique, even on systems where the pid
3884 can be re-used within our time interval. We can't shorten the interval without
3885 re-designing the message-id. See comments above where the message id is
3886 created. This is Something For The Future. */
3887
3888 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3889 exim_wait_tick(&message_id_tv, id_resolution);
3890
3891 /* Add data size to written header size. We do not count the initial file name
3892 that is in the file, but we do add one extra for the notional blank line that
3893 precedes the data. This total differs from message_size in that it include the
3894 added Received: header and any other headers that got created locally. */
3895
3896 fflush(data_file);
3897 fstat(data_fd, &statbuf);
3898
3899 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3900
3901 /* Generate a "message received" log entry. We do this by building up a dynamic
3902 string as required. Since we commonly want to add two items at a time, use a
3903 macro to simplify the coding. We log the arrival of a new message while the
3904 file is still locked, just in case the machine is *really* fast, and delivers
3905 it first! Include any message id that is in the message - since the syntax of a
3906 message id is actually an addr-spec, we can use the parse routine to canonicalize
3907 it. */
3908
3909 size = 256;
3910 sptr = 0;
3911 s = store_get(size);
3912
3913 s = string_append(s, &size, &sptr, 2,
3914 fake_response == FAIL ? US"(= " : US"<= ",
3915 sender_address[0] == 0 ? US"<>" : sender_address);
3916 if (message_reference)
3917 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3918
3919 s = add_host_info_for_log(s, &size, &sptr);
3920
3921 #ifdef SUPPORT_TLS
3922 if (LOGGING(tls_cipher) && tls_in.cipher)
3923 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3924 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3925 s = string_append(s, &size, &sptr, 2, US" CV=",
3926 tls_in.certificate_verified ? "yes":"no");
3927 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3928 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3929 string_printing(tls_in.peerdn), US"\"");
3930 if (LOGGING(tls_sni) && tls_in.sni)
3931 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3932 string_printing(tls_in.sni), US"\"");
3933 #endif
3934
3935 if (sender_host_authenticated)
3936 {
3937 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3938 if (authenticated_id)
3939 {
3940 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3941 if (LOGGING(smtp_mailauth) && authenticated_sender)
3942 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3943 }
3944 }
3945
3946 #ifndef DISABLE_PRDR
3947 if (prdr_requested)
3948 s = string_catn(s, &size, &sptr, US" PRDR", 5);
3949 #endif
3950
3951 #ifdef SUPPORT_PROXY
3952 if (proxy_session && LOGGING(proxy))
3953 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3954 #endif
3955
3956 if (chunking_state > CHUNKING_OFFERED)
3957 s = string_catn(s, &size, &sptr, US" K", 2);
3958
3959 sprintf(CS big_buffer, "%d", msg_size);
3960 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3961
3962 /* log 8BITMIME mode announced in MAIL_FROM
3963 0 ... no BODY= used
3964 7 ... 7BIT
3965 8 ... 8BITMIME */
3966 if (LOGGING(8bitmime))
3967 {
3968 sprintf(CS big_buffer, "%d", body_8bitmime);
3969 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3970 }
3971
3972 if (*queue_name)
3973 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
3974
3975 /* If an addr-spec in a message-id contains a quoted string, it can contain
3976 any characters except " \ and CR and so in particular it can contain NL!
3977 Therefore, make sure we use a printing-characters only version for the log.
3978 Also, allow for domain literals in the message id. */
3979
3980 if (msgid_header)
3981 {
3982 uschar *old_id;
3983 BOOL save_allow_domain_literals = allow_domain_literals;
3984 allow_domain_literals = TRUE;
3985 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3986 &errmsg, &start, &end, &domain, FALSE);
3987 allow_domain_literals = save_allow_domain_literals;
3988 if (old_id != NULL)
3989 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3990 }
3991
3992 /* If subject logging is turned on, create suitable printing-character
3993 text. By expanding $h_subject: we make use of the MIME decoding. */
3994
3995 if (LOGGING(subject) && subject_header != NULL)
3996 {
3997 int i;
3998 uschar *p = big_buffer;
3999 uschar *ss = expand_string(US"$h_subject:");
4000
4001 /* Backslash-quote any double quotes or backslashes so as to make a
4002 a C-like string, and turn any non-printers into escape sequences. */
4003
4004 *p++ = '\"';
4005 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4006 {
4007 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4008 *p++ = ss[i];
4009 }
4010 *p++ = '\"';
4011 *p = 0;
4012 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
4013 }
4014
4015 /* Terminate the string: string_cat() and string_append() leave room, but do
4016 not put the zero in. */
4017
4018 s[sptr] = 0;
4019
4020 /* Create a message log file if message logs are being used and this message is
4021 not blackholed. Write the reception stuff to it. We used to leave message log
4022 creation until the first delivery, but this has proved confusing for some
4023 people. */
4024
4025 if (message_logs && blackholed_by == NULL)
4026 {
4027 int fd;
4028
4029 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4030
4031 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4032 && errno == ENOENT
4033 )
4034 {
4035 (void)directory_make(spool_directory,
4036 spool_sname(US"msglog", message_subdir),
4037 MSGLOG_DIRECTORY_MODE, TRUE);
4038 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4039 }
4040
4041 if (fd < 0)
4042 {
4043 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4044 spool_name, strerror(errno));
4045 }
4046
4047 else
4048 {
4049 FILE *message_log = fdopen(fd, "a");
4050 if (message_log == NULL)
4051 {
4052 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4053 spool_name, strerror(errno));
4054 (void)close(fd);
4055 }
4056 else
4057 {
4058 uschar *now = tod_stamp(tod_log);
4059 fprintf(message_log, "%s Received from %s\n", now, s+3);
4060 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4061 frozen_by);
4062 if (queue_only_policy) fprintf(message_log,
4063 "%s no immediate delivery: queued%s%s by %s\n", now,
4064 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4065 queued_by);
4066 (void)fclose(message_log);