b97f1d2b4f20d29e49b70ce825b58cb8ed215911
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
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 #include <setjmp.h>
12
13 #ifdef EXPERIMENTAL_DCC
14 extern int dcc_ok;
15 #endif
16
17 #ifdef EXPERIMENTAL_DMARC
18 # include "dmarc.h"
19 #endif /* EXPERIMENTAL_DMARC */
20
21 /*************************************************
22 * Local static variables *
23 *************************************************/
24
25 static FILE *data_file = NULL;
26 static int data_fd = -1;
27 static uschar *spool_name = US"";
28
29 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
30
31 #ifdef HAVE_LOCAL_SCAN
32 jmp_buf local_scan_env; /* error-handling context for local_scan */
33 unsigned had_local_scan_crash;
34 unsigned had_local_scan_timeout;
35 #endif
36
37
38 /*************************************************
39 * Non-SMTP character reading functions *
40 *************************************************/
41
42 /* These are the default functions that are set up in the variables such as
43 receive_getc initially. They just call the standard functions, passing stdin as
44 the file. (When SMTP input is occurring, different functions are used by
45 changing the pointer variables.) */
46
47 int
48 stdin_getc(unsigned lim)
49 {
50 int c = getc(stdin);
51
52 if (had_data_timeout)
53 {
54 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
55 log_write(L_lost_incoming_connection,
56 LOG_MAIN, "timed out while reading local message");
57 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
58 }
59 if (had_data_sigint)
60 {
61 if (filter_test == FTEST_NONE)
62 {
63 fprintf(stderr, "\nexim: %s received - message abandoned\n",
64 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
65 log_write(0, LOG_MAIN, "%s received while reading local message",
66 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
67 }
68 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
69 }
70 return c;
71 }
72
73 int
74 stdin_ungetc(int c)
75 {
76 return ungetc(c, stdin);
77 }
78
79 int
80 stdin_feof(void)
81 {
82 return feof(stdin);
83 }
84
85 int
86 stdin_ferror(void)
87 {
88 return ferror(stdin);
89 }
90
91
92
93
94 /*************************************************
95 * Check that a set sender is allowed *
96 *************************************************/
97
98 /* This function is called when a local caller sets an explicit sender address.
99 It checks whether this is permitted, which it is for trusted callers.
100 Otherwise, it must match the pattern(s) in untrusted_set_sender.
101
102 Arguments: the proposed sender address
103 Returns: TRUE for a trusted caller
104 TRUE if the address has been set, untrusted_set_sender has been
105 set, and the address matches something in the list
106 FALSE otherwise
107 */
108
109 BOOL
110 receive_check_set_sender(uschar *newsender)
111 {
112 uschar *qnewsender;
113 if (trusted_caller) return TRUE;
114 if (!newsender || !untrusted_set_sender) return FALSE;
115 qnewsender = Ustrchr(newsender, '@')
116 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
117 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
118 }
119
120
121
122
123 /*************************************************
124 * Read space info for a partition *
125 *************************************************/
126
127 /* This function is called by receive_check_fs() below, and also by string
128 expansion for variables such as $spool_space. The field names for the statvfs
129 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
130 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
131 have inodes, and they return -1 for the number available.
132
133 Later: It turns out that some file systems that do not have the concept of
134 inodes return 0 rather than -1. Such systems should also return 0 for the total
135 number of inodes, so we require that to be greater than zero before returning
136 an inode count.
137
138 Arguments:
139 isspool TRUE for spool partition, FALSE for log partition
140 inodeptr address of int to receive inode count; -1 if there isn't one
141
142 Returns: available on-root space, in kilobytes
143 -1 for log partition if there isn't one
144
145 All values are -1 if the STATFS functions are not available.
146 */
147
148 int
149 receive_statvfs(BOOL isspool, int *inodeptr)
150 {
151 #ifdef HAVE_STATFS
152 struct STATVFS statbuf;
153 struct stat dummy;
154 uschar *path;
155 uschar *name;
156 uschar buffer[1024];
157
158 /* The spool directory must always exist. */
159
160 if (isspool)
161 {
162 path = spool_directory;
163 name = US"spool";
164 }
165
166 /* Need to cut down the log file path to the directory, and to ignore any
167 appearance of "syslog" in it. */
168
169 else
170 {
171 int sep = ':'; /* Not variable - outside scripts use */
172 const uschar *p = log_file_path;
173 name = US"log";
174
175 /* An empty log_file_path means "use the default". This is the same as an
176 empty item in a list. */
177
178 if (*p == 0) p = US":";
179 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
180 if (Ustrcmp(path, "syslog") != 0)
181 break;
182
183 if (path == NULL) /* No log files */
184 {
185 *inodeptr = -1;
186 return -1;
187 }
188
189 /* An empty string means use the default, which is in the spool directory.
190 But don't just use the spool directory, as it is possible that the log
191 subdirectory has been symbolically linked elsewhere. */
192
193 if (path[0] == 0)
194 {
195 sprintf(CS buffer, CS"%s/log", CS spool_directory);
196 path = buffer;
197 }
198 else
199 {
200 uschar *cp;
201 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
202 }
203 }
204
205 /* We now have the path; do the business */
206
207 memset(&statbuf, 0, sizeof(statbuf));
208
209 if (STATVFS(CS path, &statbuf) != 0)
210 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
211 { /* Can happen on first run after installation */
212 *inodeptr = -1;
213 return -1;
214 }
215 else
216 {
217 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
218 "%s directory %s: %s", name, path, strerror(errno));
219 smtp_closedown(US"spool or log directory problem");
220 exim_exit(EXIT_FAILURE, NULL);
221 }
222
223 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
224
225 /* Disks are getting huge. Take care with computing the size in kilobytes. */
226
227 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
228
229 #else
230 /* Unable to find partition sizes in this environment. */
231
232 *inodeptr = -1;
233 return -1;
234 #endif
235 }
236
237
238
239
240 /*************************************************
241 * Check space on spool and log partitions *
242 *************************************************/
243
244 /* This function is called before accepting a message; if any thresholds are
245 set, it checks them. If a message_size is supplied, it checks that there is
246 enough space for that size plus the threshold - i.e. that the message won't
247 reduce the space to the threshold. Not all OS have statvfs(); for those that
248 don't, this function always returns TRUE. For some OS the old function and
249 struct name statfs is used; that is handled by a macro, defined in exim.h.
250
251 Arguments:
252 msg_size the (estimated) size of an incoming message
253
254 Returns: FALSE if there isn't enough space, or if the information cannot
255 be obtained
256 TRUE if no check was done or there is enough space
257 */
258
259 BOOL
260 receive_check_fs(int msg_size)
261 {
262 int space, inodes;
263
264 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
265 {
266 space = receive_statvfs(TRUE, &inodes);
267
268 DEBUG(D_receive)
269 debug_printf("spool directory space = %dK inodes = %d "
270 "check_space = %dK inodes = %d msg_size = %d\n",
271 space, inodes, check_spool_space, check_spool_inodes, msg_size);
272
273 if ((space >= 0 && space < check_spool_space) ||
274 (inodes >= 0 && inodes < check_spool_inodes))
275 {
276 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
277 "inodes=%d", space, inodes);
278 return FALSE;
279 }
280 }
281
282 if (check_log_space > 0 || check_log_inodes > 0)
283 {
284 space = receive_statvfs(FALSE, &inodes);
285
286 DEBUG(D_receive)
287 debug_printf("log directory space = %dK inodes = %d "
288 "check_space = %dK inodes = %d\n",
289 space, inodes, check_log_space, check_log_inodes);
290
291 if ((space >= 0 && space < check_log_space) ||
292 (inodes >= 0 && inodes < check_log_inodes))
293 {
294 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
295 "inodes=%d", space, inodes);
296 return FALSE;
297 }
298 }
299
300 return TRUE;
301 }
302
303
304
305 /*************************************************
306 * Bomb out while reading a message *
307 *************************************************/
308
309 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
310 received, or if there is a timeout. A rarer case might be if the log files are
311 screwed up and Exim can't open them to record a message's arrival. Handling
312 that case is done by setting a flag to cause the log functions to call this
313 function if there is an ultimate disaster. That is why it is globally
314 accessible.
315
316 Arguments:
317 reason text reason to pass to the not-quit ACL
318 msg default SMTP response to give if in an SMTP session
319 Returns: it doesn't
320 */
321
322 void
323 receive_bomb_out(uschar *reason, uschar *msg)
324 {
325 static BOOL already_bombing_out;
326 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
327 timeouts, if someone has something slow in their quit ACL. Since the only
328 things we should be doing are to close down cleanly ASAP, on the second
329 pass we also close down stuff that might be opened again, before bypassing
330 the ACL call and exiting. */
331
332 /* If spool_name is set, it contains the name of the data file that is being
333 written. Unlink it before closing so that it cannot be picked up by a delivery
334 process. Ensure that any header file is also removed. */
335
336 if (spool_name[0] != '\0')
337 {
338 Uunlink(spool_name);
339 spool_name[Ustrlen(spool_name) - 1] = 'H';
340 Uunlink(spool_name);
341 spool_name[0] = '\0';
342 }
343
344 /* Now close the file if it is open, either as a fd or a stream. */
345
346 if (data_file)
347 {
348 (void)fclose(data_file);
349 data_file = NULL;
350 }
351 else if (data_fd >= 0)
352 {
353 (void)close(data_fd);
354 data_fd = -1;
355 }
356
357 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
358 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
359 SMTP response. */
360
361 if (!already_bombing_out)
362 {
363 already_bombing_out = TRUE;
364 if (smtp_input)
365 {
366 if (smtp_batched_input)
367 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
368 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
369 smtp_active_hostname, msg);
370 }
371 }
372
373 /* Exit from the program (non-BSMTP cases) */
374
375 exim_exit(EXIT_FAILURE, NULL);
376 }
377
378
379 /*************************************************
380 * Data read timeout *
381 *************************************************/
382
383 /* Handler function for timeouts that occur while reading the data that
384 comprises a message.
385
386 Argument: the signal number
387 Returns: nothing
388 */
389
390 static void
391 data_timeout_handler(int sig)
392 {
393 had_data_timeout = sig;
394 }
395
396
397
398 #ifdef HAVE_LOCAL_SCAN
399 /*************************************************
400 * local_scan() timeout *
401 *************************************************/
402
403 /* Handler function for timeouts that occur while running a local_scan()
404 function. Posix recommends against calling longjmp() from a signal-handler,
405 but the GCC manual says you can so we will, and trust that it's better than
406 calling probably non-signal-safe funxtions during logging from within the
407 handler, even with other compilers.
408
409 See also https://cwe.mitre.org/data/definitions/745.html which also lists
410 it as unsafe.
411
412 This is all because we have no control over what might be written for a
413 local-scan function, so cannot sprinkle had-signal checks after each
414 call-site. At least with the default "do-nothing" function we won't
415 ever get here.
416
417 Argument: the signal number
418 Returns: nothing
419 */
420
421 static void
422 local_scan_timeout_handler(int sig)
423 {
424 had_local_scan_timeout = sig;
425 siglongjmp(local_scan_env, 1);
426 }
427
428
429
430 /*************************************************
431 * local_scan() crashed *
432 *************************************************/
433
434 /* Handler function for signals that occur while running a local_scan()
435 function.
436
437 Argument: the signal number
438 Returns: nothing
439 */
440
441 static void
442 local_scan_crash_handler(int sig)
443 {
444 had_local_scan_crash = sig;
445 siglongjmp(local_scan_env, 1);
446 }
447
448 #endif /*HAVE_LOCAL_SCAN*/
449
450
451 /*************************************************
452 * SIGTERM or SIGINT received *
453 *************************************************/
454
455 /* Handler for SIGTERM or SIGINT signals that occur while reading the
456 data that comprises a message.
457
458 Argument: the signal number
459 Returns: nothing
460 */
461
462 static void
463 data_sigterm_sigint_handler(int sig)
464 {
465 had_data_sigint = sig;
466 }
467
468
469
470 /*************************************************
471 * Add new recipient to list *
472 *************************************************/
473
474 /* This function builds a list of recipient addresses in argc/argv
475 format.
476
477 Arguments:
478 recipient the next address to add to recipients_list
479 pno parent number for fixed aliases; -1 otherwise
480
481 Returns: nothing
482 */
483
484 void
485 receive_add_recipient(uschar *recipient, int pno)
486 {
487 if (recipients_count >= recipients_list_max)
488 {
489 recipient_item *oldlist = recipients_list;
490 int oldmax = recipients_list_max;
491 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
492 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
493 if (oldlist != NULL)
494 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
495 }
496
497 recipients_list[recipients_count].address = recipient;
498 recipients_list[recipients_count].pno = pno;
499 #ifdef EXPERIMENTAL_BRIGHTMAIL
500 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
501 /* reset optin string pointer for next recipient */
502 bmi_current_optin = NULL;
503 #endif
504 recipients_list[recipients_count].orcpt = NULL;
505 recipients_list[recipients_count].dsn_flags = 0;
506 recipients_list[recipients_count++].errors_to = NULL;
507 }
508
509
510
511
512 /*************************************************
513 * Send user response message *
514 *************************************************/
515
516 /* This function is passed a default response code and a user message. It calls
517 smtp_message_code() to check and possibly modify the response code, and then
518 calls smtp_respond() to transmit the response. I put this into a function
519 just to avoid a lot of repetition.
520
521 Arguments:
522 code the response code
523 user_msg the user message
524
525 Returns: nothing
526 */
527
528 #ifndef DISABLE_PRDR
529 static void
530 smtp_user_msg(uschar *code, uschar *user_msg)
531 {
532 int len = 3;
533 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
534 smtp_respond(code, len, TRUE, user_msg);
535 }
536 #endif
537
538
539
540
541
542 /*************************************************
543 * Remove a recipient from the list *
544 *************************************************/
545
546 /* This function is provided for local_scan() to use.
547
548 Argument:
549 recipient address to remove
550
551 Returns: TRUE if it did remove something; FALSE otherwise
552 */
553
554 BOOL
555 receive_remove_recipient(uschar *recipient)
556 {
557 int count;
558 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
559 recipient);
560 for (count = 0; count < recipients_count; count++)
561 {
562 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
563 {
564 if ((--recipients_count - count) > 0)
565 memmove(recipients_list + count, recipients_list + count + 1,
566 (recipients_count - count)*sizeof(recipient_item));
567 return TRUE;
568 }
569 }
570 return FALSE;
571 }
572
573
574
575
576
577 /*************************************************
578 * Read data portion of a non-SMTP message *
579 *************************************************/
580
581 /* This function is called to read the remainder of a message (following the
582 header) when the input is not from SMTP - we are receiving a local message on
583 a standard input stream. The message is always terminated by EOF, and is also
584 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
585 two cases for maximum efficiency.
586
587 Ensure that the body ends with a newline. This will naturally be the case when
588 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
589 as "sequences of lines" - this of course strictly applies only to SMTP, but
590 deliveries into BSD-type mailbox files also require it. Exim used to have a
591 flag for doing this at delivery time, but as it was always set for all
592 transports, I decided to simplify things by putting the check here instead.
593
594 There is at least one MUA (dtmail) that sends CRLF via this interface, and
595 other programs are known to do this as well. Exim used to have a option for
596 dealing with this: in July 2003, after much discussion, the code has been
597 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
598
599 However, for the case when a dot on a line by itself terminates a message, the
600 only recognized terminating sequences before and after the dot are LF and CRLF.
601 Otherwise, having read EOL . CR, you don't know whether to read another
602 character or not.
603
604 Internally, in messages stored in Exim's spool files, LF is used as the line
605 terminator. Under the new regime, bare CRs will no longer appear in these
606 files.
607
608 Arguments:
609 fout a FILE to which to write the message
610
611 Returns: One of the END_xxx values indicating why it stopped reading
612 */
613
614 static int
615 read_message_data(FILE *fout)
616 {
617 int ch_state;
618 register int ch;
619 register int linelength = 0;
620
621 /* Handle the case when only EOF terminates the message */
622
623 if (!dot_ends)
624 {
625 register int last_ch = '\n';
626
627 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
628 {
629 if (ch == 0) body_zerocount++;
630 if (last_ch == '\r' && ch != '\n')
631 {
632 if (linelength > max_received_linelength)
633 max_received_linelength = linelength;
634 linelength = 0;
635 if (fputc('\n', fout) == EOF) return END_WERROR;
636 message_size++;
637 body_linecount++;
638 }
639 if (ch == '\r') continue;
640
641 if (fputc(ch, fout) == EOF) return END_WERROR;
642 if (ch == '\n')
643 {
644 if (linelength > max_received_linelength)
645 max_received_linelength = linelength;
646 linelength = 0;
647 body_linecount++;
648 }
649 else linelength++;
650 if (++message_size > thismessage_size_limit) return END_SIZE;
651 }
652
653 if (last_ch != '\n')
654 {
655 if (linelength > max_received_linelength)
656 max_received_linelength = linelength;
657 if (fputc('\n', fout) == EOF) return END_WERROR;
658 message_size++;
659 body_linecount++;
660 }
661
662 return END_EOF;
663 }
664
665 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
666
667 ch_state = 1;
668
669 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
670 {
671 if (ch == 0) body_zerocount++;
672 switch (ch_state)
673 {
674 case 0: /* Normal state (previous char written) */
675 if (ch == '\n')
676 {
677 body_linecount++;
678 if (linelength > max_received_linelength)
679 max_received_linelength = linelength;
680 linelength = -1;
681 ch_state = 1;
682 }
683 else if (ch == '\r')
684 { ch_state = 2; continue; }
685 break;
686
687 case 1: /* After written "\n" */
688 if (ch == '.') { ch_state = 3; continue; }
689 if (ch == '\r') { ch_state = 2; continue; }
690 if (ch == '\n') { body_linecount++; linelength = -1; }
691 else ch_state = 0;
692 break;
693
694 case 2:
695 body_linecount++; /* After unwritten "\r" */
696 if (linelength > max_received_linelength)
697 max_received_linelength = linelength;
698 if (ch == '\n')
699 {
700 ch_state = 1;
701 linelength = -1;
702 }
703 else
704 {
705 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
706 if (ch == '\r') continue;
707 ch_state = 0;
708 linelength = 0;
709 }
710 break;
711
712 case 3: /* After "\n." (\n written, dot not) */
713 if (ch == '\n') return END_DOT;
714 if (ch == '\r') { ch_state = 4; continue; }
715 message_size++;
716 linelength++;
717 if (fputc('.', fout) == EOF) return END_WERROR;
718 ch_state = 0;
719 break;
720
721 case 4: /* After "\n.\r" (\n written, rest not) */
722 if (ch == '\n') return END_DOT;
723 message_size += 2;
724 body_linecount++;
725 if (fputs(".\n", fout) == EOF) return END_WERROR;
726 if (ch == '\r') { ch_state = 2; continue; }
727 ch_state = 0;
728 break;
729 }
730
731 linelength++;
732 if (fputc(ch, fout) == EOF) return END_WERROR;
733 if (++message_size > thismessage_size_limit) return END_SIZE;
734 }
735
736 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
737 the message ends with a newline, and we must also write any characters that
738 were saved up while testing for an ending dot. */
739
740 if (ch_state != 1)
741 {
742 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
743 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
744 message_size += Ustrlen(ends[ch_state]);
745 body_linecount++;
746 }
747
748 return END_EOF;
749 }
750
751
752
753
754 /*************************************************
755 * Read data portion of an SMTP message *
756 *************************************************/
757
758 /* This function is called to read the remainder of an SMTP message (after the
759 headers), or to skip over it when an error has occurred. In this case, the
760 output file is passed as NULL.
761
762 If any line begins with a dot, that character is skipped. The input should only
763 be successfully terminated by CR LF . CR LF unless it is local (non-network)
764 SMTP, in which case the CRs are optional, but...
765
766 FUDGE: It seems that sites on the net send out messages with just LF
767 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
768 we make the CRs optional in all cases.
769
770 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
771 well, so that there are no CRs in spooled messages. However, the message
772 terminating dot is not recognized between two bare CRs.
773
774 Arguments:
775 fout a FILE to which to write the message; NULL if skipping
776
777 Returns: One of the END_xxx values indicating why it stopped reading
778 */
779
780 static int
781 read_message_data_smtp(FILE *fout)
782 {
783 int ch_state = 0;
784 int ch;
785 int linelength = 0;
786
787 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
788 {
789 if (ch == 0) body_zerocount++;
790 switch (ch_state)
791 {
792 case 0: /* After LF or CRLF */
793 if (ch == '.')
794 {
795 ch_state = 3;
796 continue; /* Don't ever write . after LF */
797 }
798 ch_state = 1;
799
800 /* Else fall through to handle as normal uschar. */
801
802 case 1: /* Normal state */
803 if (ch == '\n')
804 {
805 ch_state = 0;
806 body_linecount++;
807 if (linelength > max_received_linelength)
808 max_received_linelength = linelength;
809 linelength = -1;
810 }
811 else if (ch == '\r')
812 {
813 ch_state = 2;
814 continue;
815 }
816 break;
817
818 case 2: /* After (unwritten) CR */
819 body_linecount++;
820 if (linelength > max_received_linelength)
821 max_received_linelength = linelength;
822 linelength = -1;
823 if (ch == '\n')
824 {
825 ch_state = 0;
826 }
827 else
828 {
829 message_size++;
830 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
831 cutthrough_data_put_nl();
832 if (ch != '\r') ch_state = 1; else continue;
833 }
834 break;
835
836 case 3: /* After [CR] LF . */
837 if (ch == '\n')
838 return END_DOT;
839 if (ch == '\r')
840 {
841 ch_state = 4;
842 continue;
843 }
844 /* The dot was removed at state 3. For a doubled dot, here, reinstate
845 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
846 and to file below. */
847 if (ch == '.')
848 {
849 uschar c= ch;
850 cutthrough_data_puts(&c, 1);
851 }
852 ch_state = 1;
853 break;
854
855 case 4: /* After [CR] LF . CR */
856 if (ch == '\n') return END_DOT;
857 message_size++;
858 body_linecount++;
859 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
860 cutthrough_data_put_nl();
861 if (ch == '\r')
862 {
863 ch_state = 2;
864 continue;
865 }
866 ch_state = 1;
867 break;
868 }
869
870 /* Add the character to the spool file, unless skipping; then loop for the
871 next. */
872
873 message_size++;
874 linelength++;
875 if (fout)
876 {
877 if (fputc(ch, fout) == EOF) return END_WERROR;
878 if (message_size > thismessage_size_limit) return END_SIZE;
879 }
880 if(ch == '\n')
881 cutthrough_data_put_nl();
882 else
883 {
884 uschar c = ch;
885 cutthrough_data_puts(&c, 1);
886 }
887 }
888
889 /* Fall through here if EOF encountered. This indicates some kind of error,
890 since a correct message is terminated by [CR] LF . [CR] LF. */
891
892 return END_EOF;
893 }
894
895
896
897
898 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
899 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
900 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
901 body_linecount accounting for proper re-expansion for the wire, so use
902 a cut-down version of the state-machine above; we don't need to do leading-dot
903 detection and unstuffing.
904
905 Arguments:
906 fout a FILE to which to write the message; NULL if skipping;
907 must be open for both writing and reading.
908
909 Returns: One of the END_xxx values indicating why it stopped reading
910 */
911
912 static int
913 read_message_bdat_smtp(FILE *fout)
914 {
915 int linelength = 0, ch;
916 enum CH_STATE ch_state = LF_SEEN;
917 BOOL fix_nl = FALSE;
918
919 for(;;)
920 {
921 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
922 {
923 case EOF: return END_EOF;
924 case ERR: return END_PROTOCOL;
925 case EOD:
926 /* Nothing to get from the sender anymore. We check the last
927 character written to the spool.
928
929 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
930 If we would be strict, we would refuse such broken messages.
931 But we are liberal, so we fix it. It would be easy just to append
932 the "\n" to the spool.
933
934 But there are some more things (line counting, message size calculation and such),
935 that would need to be duplicated here. So we simply do some ungetc
936 trickery.
937 */
938 if (fout)
939 {
940 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
941 if (fgetc(fout) == '\n') return END_DOT;
942 }
943
944 if (linelength == -1) /* \r already seen (see below) */
945 {
946 DEBUG(D_receive) debug_printf("Add missing LF\n");
947 bdat_ungetc('\n');
948 continue;
949 }
950 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
951 bdat_ungetc('\r'); /* not even \r was seen */
952 fix_nl = TRUE;
953
954 continue;
955 case '\0': body_zerocount++; break;
956 }
957 switch (ch_state)
958 {
959 case LF_SEEN: /* After LF or CRLF */
960 ch_state = MID_LINE;
961 /* fall through to handle as normal uschar. */
962
963 case MID_LINE: /* Mid-line state */
964 if (ch == '\n')
965 {
966 ch_state = LF_SEEN;
967 body_linecount++;
968 if (linelength > max_received_linelength)
969 max_received_linelength = linelength;
970 linelength = -1;
971 }
972 else if (ch == '\r')
973 {
974 ch_state = CR_SEEN;
975 if (fix_nl) bdat_ungetc('\n');
976 continue; /* don't write CR */
977 }
978 break;
979
980 case CR_SEEN: /* After (unwritten) CR */
981 body_linecount++;
982 if (linelength > max_received_linelength)
983 max_received_linelength = linelength;
984 linelength = -1;
985 if (ch == '\n')
986 ch_state = LF_SEEN;
987 else
988 {
989 message_size++;
990 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
991 cutthrough_data_put_nl();
992 if (ch == '\r') continue; /* don't write CR */
993 ch_state = MID_LINE;
994 }
995 break;
996 }
997
998 /* Add the character to the spool file, unless skipping */
999
1000 message_size++;
1001 linelength++;
1002 if (fout)
1003 {
1004 if (fputc(ch, fout) == EOF) return END_WERROR;
1005 if (message_size > thismessage_size_limit) return END_SIZE;
1006 }
1007 if(ch == '\n')
1008 cutthrough_data_put_nl();
1009 else
1010 {
1011 uschar c = ch;
1012 cutthrough_data_puts(&c, 1);
1013 }
1014 }
1015 /*NOTREACHED*/
1016 }
1017
1018 static int
1019 read_message_bdat_smtp_wire(FILE *fout)
1020 {
1021 int ch;
1022
1023 /* Remember that this message uses wireformat. */
1024
1025 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1026 fout ? "writing spoolfile in wire format" : "flushing input");
1027 spool_file_wireformat = TRUE;
1028
1029 for (;;)
1030 {
1031 if (chunking_data_left > 0)
1032 {
1033 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1034 uschar * buf = bdat_getbuf(&len);
1035
1036 if (!buf) return END_EOF;
1037 message_size += len;
1038 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1039 }
1040 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1041 {
1042 case EOF: return END_EOF;
1043 case EOD: return END_DOT;
1044 case ERR: return END_PROTOCOL;
1045
1046 default:
1047 message_size++;
1048 /*XXX not done:
1049 linelength
1050 max_received_linelength
1051 body_linecount
1052 body_zerocount
1053 */
1054 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1055 break;
1056 }
1057 if (message_size > thismessage_size_limit) return END_SIZE;
1058 }
1059 /*NOTREACHED*/
1060 }
1061
1062
1063
1064
1065 /*************************************************
1066 * Swallow SMTP message *
1067 *************************************************/
1068
1069 /* This function is called when there has been some kind of error while reading
1070 an SMTP message, and the remaining data may need to be swallowed. It is global
1071 because it is called from smtp_closedown() to shut down an incoming call
1072 tidily.
1073
1074 Argument: a FILE from which to read the message
1075 Returns: nothing
1076 */
1077
1078 void
1079 receive_swallow_smtp(void)
1080 {
1081 if (message_ended >= END_NOTENDED)
1082 message_ended = chunking_state <= CHUNKING_OFFERED
1083 ? read_message_data_smtp(NULL)
1084 : read_message_bdat_smtp_wire(NULL);
1085 }
1086
1087
1088
1089 /*************************************************
1090 * Handle lost SMTP connection *
1091 *************************************************/
1092
1093 /* This function logs connection loss incidents and generates an appropriate
1094 SMTP response.
1095
1096 Argument: additional data for the message
1097 Returns: the SMTP response
1098 */
1099
1100 static uschar *
1101 handle_lost_connection(uschar *s)
1102 {
1103 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1104 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1105 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1106 return US"421 Lost incoming connection";
1107 }
1108
1109
1110
1111
1112 /*************************************************
1113 * Handle a non-smtp reception error *
1114 *************************************************/
1115
1116 /* This function is called for various errors during the reception of non-SMTP
1117 messages. It either sends a message to the sender of the problem message, or it
1118 writes to the standard error stream.
1119
1120 Arguments:
1121 errcode code for moan_to_sender(), identifying the error
1122 text1 first message text, passed to moan_to_sender()
1123 text2 second message text, used only for stderrr
1124 error_rc code to pass to exim_exit if no problem
1125 f FILE containing body of message (may be stdin)
1126 hptr pointer to instore headers or NULL
1127
1128 Returns: calls exim_exit(), which does not return
1129 */
1130
1131 static void
1132 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1133 FILE *f, header_line *hptr)
1134 {
1135 if (error_handling == ERRORS_SENDER)
1136 {
1137 error_block eblock;
1138 eblock.next = NULL;
1139 eblock.text1 = text1;
1140 eblock.text2 = US"";
1141 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1142 error_rc = EXIT_FAILURE;
1143 }
1144 else
1145 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1146 (void)fclose(f);
1147 exim_exit(error_rc, US"");
1148 }
1149
1150
1151
1152 /*************************************************
1153 * Add header lines set up by ACL *
1154 *************************************************/
1155
1156 /* This function is called to add the header lines that were set up by
1157 statements in an ACL to the list of headers in memory. It is done in two stages
1158 like this, because when the ACL for RCPT is running, the other headers have not
1159 yet been received. This function is called twice; once just before running the
1160 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1161 are visible to the DATA ACL.
1162
1163 Originally these header lines were added at the end. Now there is support for
1164 three different places: top, bottom, and after the Received: header(s). There
1165 will always be at least one Received: header, even if it is marked deleted, and
1166 even if something else has been put in front of it.
1167
1168 Arguments:
1169 acl_name text to identify which ACL
1170
1171 Returns: nothing
1172 */
1173
1174 static void
1175 add_acl_headers(int where, uschar *acl_name)
1176 {
1177 header_line *h, *next;
1178 header_line *last_received = NULL;
1179
1180 switch(where)
1181 {
1182 case ACL_WHERE_DKIM:
1183 case ACL_WHERE_MIME:
1184 case ACL_WHERE_DATA:
1185 if ( cutthrough.fd >= 0 && cutthrough.delivery
1186 && (acl_removed_headers || acl_added_headers))
1187 {
1188 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1189 " will not take effect on cutthrough deliveries");
1190 return;
1191 }
1192 }
1193
1194 if (acl_removed_headers)
1195 {
1196 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1197
1198 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1199 {
1200 const uschar * list = acl_removed_headers;
1201 int sep = ':'; /* This is specified as a colon-separated list */
1202 uschar *s;
1203 uschar buffer[128];
1204
1205 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1206 if (header_testname(h, s, Ustrlen(s), FALSE))
1207 {
1208 h->type = htype_old;
1209 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1210 }
1211 }
1212 acl_removed_headers = NULL;
1213 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1214 }
1215
1216 if (!acl_added_headers) return;
1217 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1218
1219 for (h = acl_added_headers; h; h = next)
1220 {
1221 next = h->next;
1222
1223 switch(h->type)
1224 {
1225 case htype_add_top:
1226 h->next = header_list;
1227 header_list = h;
1228 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1229 break;
1230
1231 case htype_add_rec:
1232 if (!last_received)
1233 {
1234 last_received = header_list;
1235 while (!header_testname(last_received, US"Received", 8, FALSE))
1236 last_received = last_received->next;
1237 while (last_received->next &&
1238 header_testname(last_received->next, US"Received", 8, FALSE))
1239 last_received = last_received->next;
1240 }
1241 h->next = last_received->next;
1242 last_received->next = h;
1243 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1244 break;
1245
1246 case htype_add_rfc:
1247 /* add header before any header which is NOT Received: or Resent- */
1248 last_received = header_list;
1249 while ( last_received->next &&
1250 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1251 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1252 last_received = last_received->next;
1253 /* last_received now points to the last Received: or Resent-* header
1254 in an uninterrupted chain of those header types (seen from the beginning
1255 of all headers. Our current header must follow it. */
1256 h->next = last_received->next;
1257 last_received->next = h;
1258 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1259 break;
1260
1261 default:
1262 h->next = NULL;
1263 header_last->next = h;
1264 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1265 break;
1266 }
1267
1268 if (!h->next) header_last = h;
1269
1270 /* Check for one of the known header types (From:, To:, etc.) though in
1271 practice most added headers are going to be "other". Lower case
1272 identification letters are never stored with the header; they are used
1273 for existence tests when messages are received. So discard any lower case
1274 flag values. */
1275
1276 h->type = header_checkname(h, FALSE);
1277 if (h->type >= 'a') h->type = htype_other;
1278
1279 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1280 }
1281
1282 acl_added_headers = NULL;
1283 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1284 }
1285
1286
1287
1288 /*************************************************
1289 * Add host information for log line *
1290 *************************************************/
1291
1292 /* Called for acceptance and rejecting log lines. This adds information about
1293 the calling host to a string that is being built dynamically.
1294
1295 Arguments:
1296 s the dynamic string
1297
1298 Returns: the extended string
1299 */
1300
1301 static gstring *
1302 add_host_info_for_log(gstring * g)
1303 {
1304 if (sender_fullhost)
1305 {
1306 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1307 g = string_catn(g, US" DS", 3);
1308 g = string_append(g, 2, US" H=", sender_fullhost);
1309 if (LOGGING(incoming_interface) && interface_address != NULL)
1310 {
1311 g = string_cat(g,
1312 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1313 }
1314 }
1315 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1316 {
1317 g = string_catn(g, US" TFO", 4);
1318 tcp_in_fastopen_logged = TRUE;
1319 }
1320 if (sender_ident)
1321 g = string_append(g, 2, US" U=", sender_ident);
1322 if (received_protocol)
1323 g = string_append(g, 2, US" P=", received_protocol);
1324 return g;
1325 }
1326
1327
1328
1329 #ifdef WITH_CONTENT_SCAN
1330
1331 /*************************************************
1332 * Run the MIME ACL on a message *
1333 *************************************************/
1334
1335 /* This code is in a subroutine so that it can be used for both SMTP
1336 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1337
1338 Arguments:
1339 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1340 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1341 smtp_reply_ptr Where SMTP reply is being built
1342 blackholed_by_ptr Where "blackholed by" message is being built
1343
1344 Returns: TRUE to carry on; FALSE to abandon the message
1345 */
1346
1347 static BOOL
1348 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1349 uschar **blackholed_by_ptr)
1350 {
1351 FILE *mbox_file;
1352 uschar * rfc822_file_path = NULL;
1353 unsigned long mbox_size;
1354 header_line *my_headerlist;
1355 uschar *user_msg, *log_msg;
1356 int mime_part_count_buffer = -1;
1357 uschar * mbox_filename;
1358 int rc = OK;
1359
1360 /* check if it is a MIME message */
1361
1362 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1363 if ( my_headerlist->type != '*' /* skip deleted headers */
1364 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1365 )
1366 {
1367 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1368 goto DO_MIME_ACL;
1369 }
1370
1371 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1372 return TRUE;
1373
1374 DO_MIME_ACL:
1375
1376 /* make sure the eml mbox file is spooled up */
1377 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1378 { /* error while spooling */
1379 log_write(0, LOG_MAIN|LOG_PANIC,
1380 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1381 Uunlink(spool_name);
1382 unspool_mbox();
1383 #ifdef EXPERIMENTAL_DCC
1384 dcc_ok = 0;
1385 #endif
1386 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1387 message_id[0] = 0; /* Indicate no message accepted */
1388 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1389 return FALSE; /* Indicate skip to end of receive function */
1390 }
1391
1392 mime_is_rfc822 = 0;
1393
1394 MIME_ACL_CHECK:
1395 mime_part_count = -1;
1396 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1397 (void)fclose(mbox_file);
1398
1399 if (rfc822_file_path)
1400 {
1401 mime_part_count = mime_part_count_buffer;
1402
1403 if (unlink(CS rfc822_file_path) == -1)
1404 {
1405 log_write(0, LOG_PANIC,
1406 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1407 goto END_MIME_ACL;
1408 }
1409 rfc822_file_path = NULL;
1410 }
1411
1412 /* check if we must check any message/rfc822 attachments */
1413 if (rc == OK)
1414 {
1415 uschar * scandir = string_copyn(mbox_filename,
1416 Ustrrchr(mbox_filename, '/') - mbox_filename);
1417 struct dirent * entry;
1418 DIR * tempdir;
1419
1420 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1421 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1422 {
1423 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1424 DEBUG(D_receive)
1425 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1426 rfc822_file_path);
1427 break;
1428 }
1429 closedir(tempdir);
1430
1431 if (rfc822_file_path)
1432 {
1433 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1434 {
1435 /* set RFC822 expansion variable */
1436 mime_is_rfc822 = 1;
1437 mime_part_count_buffer = mime_part_count;
1438 goto MIME_ACL_CHECK;
1439 }
1440 log_write(0, LOG_PANIC,
1441 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1442 unlink(CS rfc822_file_path);
1443 }
1444 }
1445
1446 END_MIME_ACL:
1447 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1448 if (rc == DISCARD)
1449 {
1450 recipients_count = 0;
1451 *blackholed_by_ptr = US"MIME ACL";
1452 }
1453 else if (rc != OK)
1454 {
1455 Uunlink(spool_name);
1456 unspool_mbox();
1457 #ifdef EXPERIMENTAL_DCC
1458 dcc_ok = 0;
1459 #endif
1460 if (smtp_input)
1461 {
1462 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1463 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1464 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1465 }
1466 message_id[0] = 0; /* Indicate no message accepted */
1467 return FALSE; /* Cause skip to end of receive function */
1468 }
1469
1470 return TRUE;
1471 }
1472
1473 #endif /* WITH_CONTENT_SCAN */
1474
1475
1476
1477 void
1478 received_header_gen(void)
1479 {
1480 uschar *received;
1481 uschar *timestamp;
1482 header_line *received_header= header_list;
1483
1484 timestamp = expand_string(US"${tod_full}");
1485 if (recipients_count == 1) received_for = recipients_list[0].address;
1486 received = expand_string(received_header_text);
1487 received_for = NULL;
1488
1489 if (!received)
1490 {
1491 if(spool_name[0] != 0)
1492 Uunlink(spool_name); /* Lose the data file */
1493 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1494 "(received_header_text) failed: %s", string_printing(received_header_text),
1495 expand_string_message);
1496 }
1497
1498 /* The first element on the header chain is reserved for the Received header,
1499 so all we have to do is fill in the text pointer, and set the type. However, if
1500 the result of the expansion is an empty string, we leave the header marked as
1501 "old" so as to refrain from adding a Received header. */
1502
1503 if (received[0] == 0)
1504 {
1505 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1506 received_header->type = htype_old;
1507 }
1508 else
1509 {
1510 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1511 received_header->type = htype_received;
1512 }
1513
1514 received_header->slen = Ustrlen(received_header->text);
1515
1516 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1517 received_header->type, received_header->text);
1518 }
1519
1520
1521
1522 /*************************************************
1523 * Receive message *
1524 *************************************************/
1525
1526 /* Receive a message on the given input, and put it into a pair of spool files.
1527 Either a non-null list of recipients, or the extract flag will be true, or
1528 both. The flag sender_local is true for locally generated messages. The flag
1529 submission_mode is true if an ACL has obeyed "control = submission". The flag
1530 suppress_local_fixups is true if an ACL has obeyed "control =
1531 suppress_local_fixups" or -G was passed on the command-line.
1532 The flag smtp_input is true if the message is to be
1533 handled using SMTP conventions about termination and lines starting with dots.
1534 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1535
1536 If a message was successfully read, message_id[0] will be non-zero.
1537
1538 The general actions of this function are:
1539
1540 . Read the headers of the message (if any) into a chain of store
1541 blocks.
1542
1543 . If there is a "sender:" header and the message is locally originated,
1544 throw it away, unless the caller is trusted, or unless
1545 active_local_sender_retain is set - which can only happen if
1546 active_local_from_check is false.
1547
1548 . If recipients are to be extracted from the message, build the
1549 recipients list from the headers, removing any that were on the
1550 original recipients list (unless extract_addresses_remove_arguments is
1551 false), and at the same time, remove any bcc header that may be present.
1552
1553 . Get the spool file for the data, sort out its unique name, open
1554 and lock it (but don't give it the name yet).
1555
1556 . Generate a "Message-Id" header if the message doesn't have one, for
1557 locally-originated messages.
1558
1559 . Generate a "Received" header.
1560
1561 . Ensure the recipients list is fully qualified and rewritten if necessary.
1562
1563 . If there are any rewriting rules, apply them to the sender address
1564 and also to the headers.
1565
1566 . If there is no from: header, generate one, for locally-generated messages
1567 and messages in "submission mode" only.
1568
1569 . If the sender is local, check that from: is correct, and if not, generate
1570 a Sender: header, unless message comes from a trusted caller, or this
1571 feature is disabled by active_local_from_check being false.
1572
1573 . If there is no "date" header, generate one, for locally-originated
1574 or submission mode messages only.
1575
1576 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1577 dot_ends mode, to the data file. Leave it open, to hold the lock.
1578
1579 . Write the envelope and the headers to a new file.
1580
1581 . Set the name for the header file; close it.
1582
1583 . Set the name for the data file; close it.
1584
1585 Because this function can potentially be called many times in a single
1586 SMTP connection, all store should be got by store_get(), so that it will be
1587 automatically retrieved after the message is accepted.
1588
1589 FUDGE: It seems that sites on the net send out messages with just LF
1590 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1591 we make the CRs optional in all cases.
1592
1593 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1594 new regime is now in place in which bare CRs in header lines are turned into LF
1595 followed by a space, so as not to terminate the header line.
1596
1597 February 2004: A bare LF in a header line in a message whose first line was
1598 terminated by CRLF is treated in the same way as a bare CR.
1599
1600 Arguments:
1601 extract_recip TRUE if recipients are to be extracted from the message's
1602 headers
1603
1604 Returns: TRUE there are more messages to be read (SMTP input)
1605 FALSE there are no more messages to be read (non-SMTP input
1606 or SMTP connection collapsed, or other failure)
1607
1608 When reading a message for filter testing, the returned value indicates
1609 whether the headers (which is all that is read) were terminated by '.' or
1610 not. */
1611
1612 BOOL
1613 receive_msg(BOOL extract_recip)
1614 {
1615 int i;
1616 int rc = FAIL;
1617 int msg_size = 0;
1618 int process_info_len = Ustrlen(process_info);
1619 int error_rc = error_handling == ERRORS_SENDER
1620 ? errors_sender_rc : EXIT_FAILURE;
1621 int header_size = 256;
1622 int start, end, domain;
1623 int id_resolution;
1624 int had_zero = 0;
1625 int prevlines_length = 0;
1626
1627 int ptr = 0;
1628
1629 BOOL contains_resent_headers = FALSE;
1630 BOOL extracted_ignored = FALSE;
1631 BOOL first_line_ended_crlf = TRUE_UNSET;
1632 BOOL smtp_yield = TRUE;
1633 BOOL yield = FALSE;
1634
1635 BOOL resents_exist = FALSE;
1636 uschar *resent_prefix = US"";
1637 uschar *blackholed_by = NULL;
1638 uschar *blackhole_log_msg = US"";
1639 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1640
1641 flock_t lock_data;
1642 error_block *bad_addresses = NULL;
1643
1644 uschar *frozen_by = NULL;
1645 uschar *queued_by = NULL;
1646
1647 uschar *errmsg;
1648 gstring * g;
1649 struct stat statbuf;
1650
1651 /* Final message to give to SMTP caller, and messages from ACLs */
1652
1653 uschar *smtp_reply = NULL;
1654 uschar *user_msg, *log_msg;
1655
1656 /* Working header pointers */
1657
1658 header_line *h, *next;
1659
1660 /* Flags for noting the existence of certain headers (only one left) */
1661
1662 BOOL date_header_exists = FALSE;
1663
1664 /* Pointers to receive the addresses of headers whose contents we need. */
1665
1666 header_line *from_header = NULL;
1667 header_line *subject_header = NULL;
1668 header_line *msgid_header = NULL;
1669 header_line *received_header;
1670
1671 #ifdef EXPERIMENTAL_DMARC
1672 int dmarc_up = 0;
1673 #endif /* EXPERIMENTAL_DMARC */
1674
1675 /* Variables for use when building the Received: header. */
1676
1677 uschar *timestamp;
1678 int tslen;
1679
1680
1681 /* Release any open files that might have been cached while preparing to
1682 accept the message - e.g. by verifying addresses - because reading a message
1683 might take a fair bit of real time. */
1684
1685 search_tidyup();
1686
1687 /* Extracting the recipient list from an input file is incompatible with
1688 cutthrough delivery with the no-spool option. It shouldn't be possible
1689 to set up the combination, but just in case kill any ongoing connection. */
1690 if (extract_recip || !smtp_input)
1691 cancel_cutthrough_connection(TRUE, US"not smtp input");
1692
1693 /* Initialize the chain of headers by setting up a place-holder for Received:
1694 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1695 pointing to the end of the chain to make adding headers simple. */
1696
1697 received_header = header_list = header_last = store_get(sizeof(header_line));
1698 header_list->next = NULL;
1699 header_list->type = htype_old;
1700 header_list->text = NULL;
1701 header_list->slen = 0;
1702
1703 /* Control block for the next header to be read. */
1704
1705 next = store_get(sizeof(header_line));
1706 next->text = store_get(header_size);
1707
1708 /* Initialize message id to be null (indicating no message read), and the
1709 header names list to be the normal list. Indicate there is no data file open
1710 yet, initialize the size and warning count, and deal with no size limit. */
1711
1712 message_id[0] = 0;
1713 data_file = NULL;
1714 data_fd = -1;
1715 spool_name = US"";
1716 message_size = 0;
1717 warning_count = 0;
1718 received_count = 1; /* For the one we will add */
1719
1720 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1721
1722 /* While reading the message, the following counts are computed. */
1723
1724 message_linecount = body_linecount = body_zerocount =
1725 max_received_linelength = 0;
1726
1727 #ifndef DISABLE_DKIM
1728 /* Call into DKIM to set up the context. In CHUNKING mode
1729 we clear the dot-stuffing flag */
1730 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1731 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1732 #endif
1733
1734 #ifdef EXPERIMENTAL_DMARC
1735 /* initialize libopendmarc */
1736 dmarc_up = dmarc_init();
1737 #endif
1738
1739 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1740 ids, and fractions of a second are required. See the comments that precede the
1741 message id creation below. */
1742
1743 (void)gettimeofday(&message_id_tv, NULL);
1744
1745 /* For other uses of the received time we can operate with granularity of one
1746 second, and for that we use the global variable received_time. This is for
1747 things like ultimate message timeouts. */
1748
1749 received_time = message_id_tv;
1750
1751 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1752 happen in the smtp_getc() function when it refills its buffer. */
1753
1754 had_data_timeout = 0;
1755 if (smtp_input)
1756 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1757
1758 /* If not SMTP input, timeout happens only if configured, and we just set a
1759 single timeout for the whole message. */
1760
1761 else if (receive_timeout > 0)
1762 {
1763 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1764 alarm(receive_timeout);
1765 }
1766
1767 /* SIGTERM and SIGINT are caught always. */
1768
1769 had_data_sigint = 0;
1770 signal(SIGTERM, data_sigterm_sigint_handler);
1771 signal(SIGINT, data_sigterm_sigint_handler);
1772
1773 /* Header lines in messages are not supposed to be very long, though when
1774 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1775 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1776 storing the header, and extend this as necessary using string_cat().
1777
1778 To cope with total lunacies, impose an upper limit on the length of the header
1779 section of the message, as otherwise the store will fill up. We must also cope
1780 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1781 Folded header lines are joined into one string, leaving the '\n' characters
1782 inside them, so that writing them out reproduces the input.
1783
1784 Loop for each character of each header; the next structure for chaining the
1785 header is set up already, with ptr the offset of the next character in
1786 next->text. */
1787
1788 for (;;)
1789 {
1790 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1791
1792 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1793 SMTP must have a correct "." terminator. */
1794
1795 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1796 {
1797 smtp_reply = handle_lost_connection(US" (header)");
1798 smtp_yield = FALSE;
1799 goto TIDYUP; /* Skip to end of function */
1800 }
1801
1802 /* See if we are at the current header's size limit - there must be at least
1803 four bytes left. This allows for the new character plus a zero, plus two for
1804 extra insertions when we are playing games with dots and carriage returns. If
1805 we are at the limit, extend the text buffer. This could have been done
1806 automatically using string_cat() but because this is a tightish loop storing
1807 only one character at a time, we choose to do it inline. Normally
1808 store_extend() will be able to extend the block; only at the end of a big
1809 store block will a copy be needed. To handle the case of very long headers
1810 (and sometimes lunatic messages can have ones that are 100s of K long) we
1811 call store_release() for strings that have been copied - if the string is at
1812 the start of a block (and therefore the only thing in it, because we aren't
1813 doing any other gets), the block gets freed. We can only do this release if
1814 there were no allocations since the once that we want to free. */
1815
1816 if (ptr >= header_size - 4)
1817 {
1818 int oldsize = header_size;
1819 /* header_size += 256; */
1820 header_size *= 2;
1821 if (!store_extend(next->text, oldsize, header_size))
1822 next->text = store_newblock(next->text, header_size, ptr);
1823 }
1824
1825 /* Cope with receiving a binary zero. There is dispute about whether
1826 these should be allowed in RFC 822 messages. The middle view is that they
1827 should not be allowed in headers, at least. Exim takes this attitude at
1828 the moment. We can't just stomp on them here, because we don't know that
1829 this line is a header yet. Set a flag to cause scanning later. */
1830
1831 if (ch == 0) had_zero++;
1832
1833 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1834 those from data files use just LF. Treat LF in local SMTP input as a
1835 terminator too. Treat EOF as a line terminator always. */
1836
1837 if (ch == EOF) goto EOL;
1838
1839 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1840 other MTAs accept this. We are therefore forced into this "liberalisation"
1841 too, so we accept LF as a line terminator whatever the source of the message.
1842 However, if the first line of the message ended with a CRLF, we treat a bare
1843 LF specially by inserting a white space after it to ensure that the header
1844 line is not terminated. */
1845
1846 if (ch == '\n')
1847 {
1848 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1849 else if (first_line_ended_crlf) receive_ungetc(' ');
1850 goto EOL;
1851 }
1852
1853 /* This is not the end of the line. If this is SMTP input and this is
1854 the first character in the line and it is a "." character, ignore it.
1855 This implements the dot-doubling rule, though header lines starting with
1856 dots aren't exactly common. They are legal in RFC 822, though. If the
1857 following is CRLF or LF, this is the line that that terminates the
1858 entire message. We set message_ended to indicate this has happened (to
1859 prevent further reading), and break out of the loop, having freed the
1860 empty header, and set next = NULL to indicate no data line. */
1861
1862 if (ptr == 0 && ch == '.' && dot_ends)
1863 {
1864 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1865 if (ch == '\r')
1866 {
1867 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1868 if (ch != '\n')
1869 {
1870 receive_ungetc(ch);
1871 ch = '\r'; /* Revert to CR */
1872 }
1873 }
1874 if (ch == '\n')
1875 {
1876 message_ended = END_DOT;
1877 store_reset(next);
1878 next = NULL;
1879 break; /* End character-reading loop */
1880 }
1881
1882 /* For non-SMTP input, the dot at the start of the line was really a data
1883 character. What is now in ch is the following character. We guaranteed
1884 enough space for this above. */
1885
1886 if (!smtp_input)
1887 {
1888 next->text[ptr++] = '.';
1889 message_size++;
1890 }
1891 }
1892
1893 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1894 remember this case if this is the first line ending. */
1895
1896 if (ch == '\r')
1897 {
1898 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1899 if (ch == '\n')
1900 {
1901 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1902 goto EOL;
1903 }
1904
1905 /* Otherwise, put back the character after CR, and turn the bare CR
1906 into LF SP. */
1907
1908 ch = (receive_ungetc)(ch);
1909 next->text[ptr++] = '\n';
1910 message_size++;
1911 ch = ' ';
1912 }
1913
1914 /* We have a data character for the header line. */
1915
1916 next->text[ptr++] = ch; /* Add to buffer */
1917 message_size++; /* Total message size so far */
1918
1919 /* Handle failure due to a humungously long header section. The >= allows
1920 for the terminating \n. Add what we have so far onto the headers list so
1921 that it gets reflected in any error message, and back up the just-read
1922 character. */
1923
1924 if (message_size >= header_maxsize)
1925 {
1926 next->text[ptr] = 0;
1927 next->slen = ptr;
1928 next->type = htype_other;
1929 next->next = NULL;
1930 header_last->next = next;
1931 header_last = next;
1932
1933 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1934 "%s (more than %d characters): message abandoned",
1935 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1936
1937 if (smtp_input)
1938 {
1939 smtp_reply = US"552 Message header is ridiculously long";
1940 receive_swallow_smtp();
1941 goto TIDYUP; /* Skip to end of function */
1942 }
1943
1944 else
1945 {
1946 give_local_error(ERRMESS_VLONGHEADER,
1947 string_sprintf("message header longer than %d characters received: "
1948 "message not accepted", header_maxsize), US"", error_rc, stdin,
1949 header_list->next);
1950 /* Does not return */
1951 }
1952 }
1953
1954 continue; /* With next input character */
1955
1956 /* End of header line reached */
1957
1958 EOL:
1959
1960 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1961
1962 receive_linecount++;
1963 message_linecount++;
1964
1965 /* Keep track of maximum line length */
1966
1967 if (ptr - prevlines_length > max_received_linelength)
1968 max_received_linelength = ptr - prevlines_length;
1969 prevlines_length = ptr + 1;
1970
1971 /* Now put in the terminating newline. There is always space for
1972 at least two more characters. */
1973
1974 next->text[ptr++] = '\n';
1975 message_size++;
1976
1977 /* A blank line signals the end of the headers; release the unwanted
1978 space and set next to NULL to indicate this. */
1979
1980 if (ptr == 1)
1981 {
1982 store_reset(next);
1983 next = NULL;
1984 break;
1985 }
1986
1987 /* There is data in the line; see if the next input character is a
1988 whitespace character. If it is, we have a continuation of this header line.
1989 There is always space for at least one character at this point. */
1990
1991 if (ch != EOF)
1992 {
1993 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1994 if (nextch == ' ' || nextch == '\t')
1995 {
1996 next->text[ptr++] = nextch;
1997 message_size++;
1998 continue; /* Iterate the loop */
1999 }
2000 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2001 else ch = EOF; /* Cause main loop to exit at end */
2002 }
2003
2004 /* We have got to the real line end. Terminate the string and release store
2005 beyond it. If it turns out to be a real header, internal binary zeros will
2006 be squashed later. */
2007
2008 next->text[ptr] = 0;
2009 next->slen = ptr;
2010 store_reset(next->text + ptr + 1);
2011
2012 /* Check the running total size against the overall message size limit. We
2013 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2014 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2015 headers - the code to read the body will then also hit the buffer. */
2016
2017 if (message_size > thismessage_size_limit) break;
2018
2019 /* A line that is not syntactically correct for a header also marks
2020 the end of the headers. In this case, we leave next containing the
2021 first data line. This might actually be several lines because of the
2022 continuation logic applied above, but that doesn't matter.
2023
2024 It turns out that smail, and presumably sendmail, accept leading lines
2025 of the form
2026
2027 From ph10 Fri Jan 5 12:35 GMT 1996
2028
2029 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2030 find any documentation of this, but for compatibility it had better be
2031 accepted. Exim restricts it to the case of non-smtp messages, and
2032 treats it as an alternative to the -f command line option. Thus it is
2033 ignored except for trusted users or filter testing. Otherwise it is taken
2034 as the sender address, unless -f was used (sendmail compatibility).
2035
2036 It further turns out that some UUCPs generate the From_line in a different
2037 format, e.g.
2038
2039 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2040
2041 The regex for matching these things is now capable of recognizing both
2042 formats (including 2- and 4-digit years in the latter). In fact, the regex
2043 is now configurable, as is the expansion string to fish out the sender.
2044
2045 Even further on it has been discovered that some broken clients send
2046 these lines in SMTP messages. There is now an option to ignore them from
2047 specified hosts or networks. Sigh. */
2048
2049 if ( header_last == header_list
2050 && ( !smtp_input
2051 || ( sender_host_address
2052 && verify_check_host(&ignore_fromline_hosts) == OK
2053 )
2054 || (!sender_host_address && ignore_fromline_local)
2055 )
2056 && regex_match_and_setup(regex_From, next->text, 0, -1)
2057 )
2058 {
2059 if (!sender_address_forced)
2060 {
2061 uschar *uucp_sender = expand_string(uucp_from_sender);
2062 if (!uucp_sender)
2063 log_write(0, LOG_MAIN|LOG_PANIC,
2064 "expansion of \"%s\" failed after matching "
2065 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2066 else
2067 {
2068 int start, end, domain;
2069 uschar *errmess;
2070 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2071 &start, &end, &domain, TRUE);
2072 if (newsender)
2073 {
2074 if (domain == 0 && newsender[0] != 0)
2075 newsender = rewrite_address_qualify(newsender, FALSE);
2076
2077 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2078 {
2079 sender_address = newsender;
2080
2081 if (trusted_caller || filter_test != FTEST_NONE)
2082 {
2083 authenticated_sender = NULL;
2084 originator_name = US"";
2085 sender_local = FALSE;
2086 }
2087
2088 if (filter_test != FTEST_NONE)
2089 printf("Sender taken from \"From \" line\n");
2090 }
2091 }
2092 }
2093 }
2094 }
2095
2096 /* Not a leading "From " line. Check to see if it is a valid header line.
2097 Header names may contain any non-control characters except space and colon,
2098 amazingly. */
2099
2100 else
2101 {
2102 uschar *p = next->text;
2103
2104 /* If not a valid header line, break from the header reading loop, leaving
2105 next != NULL, indicating that it holds the first line of the body. */
2106
2107 if (isspace(*p)) break;
2108 while (mac_isgraph(*p) && *p != ':') p++;
2109 while (isspace(*p)) p++;
2110 if (*p != ':')
2111 {
2112 body_zerocount = had_zero;
2113 break;
2114 }
2115
2116 /* We have a valid header line. If there were any binary zeroes in
2117 the line, stomp on them here. */
2118
2119 if (had_zero > 0)
2120 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2121
2122 /* It is perfectly legal to have an empty continuation line
2123 at the end of a header, but it is confusing to humans
2124 looking at such messages, since it looks like a blank line.
2125 Reduce confusion by removing redundant white space at the
2126 end. We know that there is at least one printing character
2127 (the ':' tested for above) so there is no danger of running
2128 off the end. */
2129
2130 p = next->text + ptr - 2;
2131 for (;;)
2132 {
2133 while (*p == ' ' || *p == '\t') p--;
2134 if (*p != '\n') break;
2135 ptr = (p--) - next->text + 1;
2136 message_size -= next->slen - ptr;
2137 next->text[ptr] = 0;
2138 next->slen = ptr;
2139 }
2140
2141 /* Add the header to the chain */
2142
2143 next->type = htype_other;
2144 next->next = NULL;
2145 header_last->next = next;
2146 header_last = next;
2147
2148 /* Check the limit for individual line lengths. This comes after adding to
2149 the chain so that the failing line is reflected if a bounce is generated
2150 (for a local message). */
2151
2152 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2153 {
2154 log_write(0, LOG_MAIN, "overlong message header line received from "
2155 "%s (more than %d characters): message abandoned",
2156 sender_host_unknown? sender_ident : sender_fullhost,
2157 header_line_maxsize);
2158
2159 if (smtp_input)
2160 {
2161 smtp_reply = US"552 A message header line is too long";
2162 receive_swallow_smtp();
2163 goto TIDYUP; /* Skip to end of function */
2164 }
2165
2166 else
2167 give_local_error(ERRMESS_VLONGHDRLINE,
2168 string_sprintf("message header line longer than %d characters "
2169 "received: message not accepted", header_line_maxsize), US"",
2170 error_rc, stdin, header_list->next);
2171 /* Does not return */
2172 }
2173
2174 /* Note if any resent- fields exist. */
2175
2176 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2177 {
2178 resents_exist = TRUE;
2179 resent_prefix = US"Resent-";
2180 }
2181 }
2182
2183 /* Reject CHUNKING messages that do not CRLF their first header line */
2184
2185 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2186 {
2187 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2188 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2189 sender_address,
2190 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2191 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2192 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2193 bdat_flush_data();
2194 smtp_reply = US"";
2195 goto TIDYUP; /* Skip to end of function */
2196 }
2197
2198 /* The line has been handled. If we have hit EOF, break out of the loop,
2199 indicating no pending data line. */
2200
2201 if (ch == EOF) { next = NULL; break; }
2202
2203 /* Set up for the next header */
2204
2205 header_size = 256;
2206 next = store_get(sizeof(header_line));
2207 next->text = store_get(header_size);
2208 ptr = 0;
2209 had_zero = 0;
2210 prevlines_length = 0;
2211 } /* Continue, starting to read the next header */
2212
2213 /* At this point, we have read all the headers into a data structure in main
2214 store. The first header is still the dummy placeholder for the Received: header
2215 we are going to generate a bit later on. If next != NULL, it contains the first
2216 data line - which terminated the headers before reaching a blank line (not the
2217 normal case). */
2218
2219 DEBUG(D_receive)
2220 {
2221 debug_printf(">>Headers received:\n");
2222 for (h = header_list->next; h; h = h->next)
2223 debug_printf("%s", h->text);
2224 debug_printf("\n");
2225 }
2226
2227 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2228 is dropped immediately after valid headers, the next thing we will see is EOF.
2229 We must test for this specially, as further down the reading of the data is
2230 skipped if already at EOF. */
2231
2232 if (smtp_input && (receive_feof)())
2233 {
2234 smtp_reply = handle_lost_connection(US" (after header)");
2235 smtp_yield = FALSE;
2236 goto TIDYUP; /* Skip to end of function */
2237 }
2238
2239 /* If this is a filter test run and no headers were read, output a warning
2240 in case there is a mistake in the test message. */
2241
2242 if (filter_test != FTEST_NONE && header_list->next == NULL)
2243 printf("Warning: no message headers read\n");
2244
2245
2246 /* Scan the headers to identify them. Some are merely marked for later
2247 processing; some are dealt with here. */
2248
2249 for (h = header_list->next; h; h = h->next)
2250 {
2251 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2252 if (is_resent) contains_resent_headers = TRUE;
2253
2254 switch (header_checkname(h, is_resent))
2255 {
2256 case htype_bcc:
2257 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2258 break;
2259
2260 case htype_cc:
2261 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2262 break;
2263
2264 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2265
2266 case htype_date:
2267 if (!resents_exist || is_resent) date_header_exists = TRUE;
2268 break;
2269
2270 /* Same comments as about Return-Path: below. */
2271
2272 case htype_delivery_date:
2273 if (delivery_date_remove) h->type = htype_old;
2274 break;
2275
2276 /* Same comments as about Return-Path: below. */
2277
2278 case htype_envelope_to:
2279 if (envelope_to_remove) h->type = htype_old;
2280 break;
2281
2282 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2283 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2284 header consists of just the login id of the user who called Exim, rewrite
2285 it with the gecos field first. Apply this rule to Resent-From: if there
2286 are resent- fields. */
2287
2288 case htype_from:
2289 h->type = htype_from;
2290 if (!resents_exist || is_resent)
2291 {
2292 from_header = h;
2293 if (!smtp_input)
2294 {
2295 int len;
2296 uschar *s = Ustrchr(h->text, ':') + 1;
2297 while (isspace(*s)) s++;
2298 len = h->slen - (s - h->text) - 1;
2299 if (Ustrlen(originator_login) == len &&
2300 strncmpic(s, originator_login, len) == 0)
2301 {
2302 uschar *name = is_resent? US"Resent-From" : US"From";
2303 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2304 originator_login, qualify_domain_sender);
2305 from_header = header_last;
2306 h->type = htype_old;
2307 DEBUG(D_receive|D_rewrite)
2308 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2309 }
2310 }
2311 }
2312 break;
2313
2314 /* Identify the Message-id: header for generating "in-reply-to" in the
2315 autoreply transport. For incoming logging, save any resent- value. In both
2316 cases, take just the first of any multiples. */
2317
2318 case htype_id:
2319 if (!msgid_header && (!resents_exist || is_resent))
2320 {
2321 msgid_header = h;
2322 h->type = htype_id;
2323 }
2324 break;
2325
2326 /* Flag all Received: headers */
2327
2328 case htype_received:
2329 h->type = htype_received;
2330 received_count++;
2331 break;
2332
2333 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2334
2335 case htype_reply_to:
2336 h->type = htype_reply_to;
2337 break;
2338
2339 /* The Return-path: header is supposed to be added to messages when
2340 they leave the SMTP system. We shouldn't receive messages that already
2341 contain Return-path. However, since Exim generates Return-path: on
2342 local delivery, resent messages may well contain it. We therefore
2343 provide an option (which defaults on) to remove any Return-path: headers
2344 on input. Removal actually means flagging as "old", which prevents the
2345 header being transmitted with the message. */
2346
2347 case htype_return_path:
2348 if (return_path_remove) h->type = htype_old;
2349
2350 /* If we are testing a mail filter file, use the value of the
2351 Return-Path: header to set up the return_path variable, which is not
2352 otherwise set. However, remove any <> that surround the address
2353 because the variable doesn't have these. */
2354
2355 if (filter_test != FTEST_NONE)
2356 {
2357 uschar *start = h->text + 12;
2358 uschar *end = start + Ustrlen(start);
2359 while (isspace(*start)) start++;
2360 while (end > start && isspace(end[-1])) end--;
2361 if (*start == '<' && end[-1] == '>')
2362 {
2363 start++;
2364 end--;
2365 }
2366 return_path = string_copyn(start, end - start);
2367 printf("Return-path taken from \"Return-path:\" header line\n");
2368 }
2369 break;
2370
2371 /* If there is a "Sender:" header and the message is locally originated,
2372 and from an untrusted caller and suppress_local_fixups is not set, or if we
2373 are in submission mode for a remote message, mark it "old" so that it will
2374 not be transmitted with the message, unless active_local_sender_retain is
2375 set. (This can only be true if active_local_from_check is false.) If there
2376 are any resent- headers in the message, apply this rule to Resent-Sender:
2377 instead of Sender:. Messages with multiple resent- header sets cannot be
2378 tidily handled. (For this reason, at least one MUA - Pine - turns old
2379 resent- headers into X-resent- headers when resending, leaving just one
2380 set.) */
2381
2382 case htype_sender:
2383 h->type = !active_local_sender_retain
2384 && ( sender_local && !trusted_caller && !suppress_local_fixups
2385 || submission_mode
2386 )
2387 && (!resents_exist || is_resent)
2388 ? htype_old : htype_sender;
2389 break;
2390
2391 /* Remember the Subject: header for logging. There is no Resent-Subject */
2392
2393 case htype_subject:
2394 subject_header = h;
2395 break;
2396
2397 /* "To:" gets flagged, and the existence of a recipient header is noted,
2398 whether it's resent- or not. */
2399
2400 case htype_to:
2401 h->type = htype_to;
2402 /****
2403 to_or_cc_header_exists = TRUE;
2404 ****/
2405 break;
2406 }
2407 }
2408
2409 /* Extract recipients from the headers if that is required (the -t option).
2410 Note that this is documented as being done *before* any address rewriting takes
2411 place. There are two possibilities:
2412
2413 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2414 recipients already listed are to be REMOVED from the message. Smail 3 works
2415 like this. We need to build a non-recipients tree for that list, because in
2416 subsequent processing this data is held in a tree and that's what the
2417 spool_write_header() function expects. Make sure that non-recipient addresses
2418 are fully qualified and rewritten if necessary.
2419
2420 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2421 those in the command line arguments (and it is rumoured some other MTAs do
2422 this). Therefore, there is an option to make Exim behave this way.
2423
2424 *** Notes on "Resent-" header lines ***
2425
2426 The presence of resent-headers in the message makes -t horribly ambiguous.
2427 Experiments with sendmail showed that it uses recipients for all resent-
2428 headers, totally ignoring the concept of "sets of resent- headers" as described
2429 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2430 with all the addresses in one instance of each header.
2431
2432 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2433 error for -t if there were resent- headers in the message. However, after a
2434 discussion on the mailing list, I've learned that there are MUAs that use
2435 resent- headers with -t, and also that the stuff about sets of resent- headers
2436 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2437 message with -t and resent- header lines makes sure that only *its* resent-
2438 headers are present; previous ones are often renamed as X-resent- for example.
2439
2440 Consequently, Exim has been changed so that, if any resent- header lines are
2441 present, the recipients are taken from all of the appropriate resent- lines,
2442 and not from the ordinary To:, Cc:, etc. */
2443
2444 if (extract_recip)
2445 {
2446 int rcount = 0;
2447 error_block **bnext = &bad_addresses;
2448
2449 if (extract_addresses_remove_arguments)
2450 {
2451 while (recipients_count-- > 0)
2452 {
2453 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2454 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2455 tree_add_nonrecipient(s);
2456 }
2457 recipients_list = NULL;
2458 recipients_count = recipients_list_max = 0;
2459 }
2460
2461 /* Now scan the headers */
2462
2463 for (h = header_list->next; h; h = h->next)
2464 {
2465 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2466 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2467 {
2468 uschar *s = Ustrchr(h->text, ':') + 1;
2469 while (isspace(*s)) s++;
2470
2471 parse_allow_group = TRUE; /* Allow address group syntax */
2472
2473 while (*s != 0)
2474 {
2475 uschar *ss = parse_find_address_end(s, FALSE);
2476 uschar *recipient, *errmess, *p, *pp;
2477 int start, end, domain;
2478
2479 /* Check on maximum */
2480
2481 if (recipients_max > 0 && ++rcount > recipients_max)
2482 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2483 US"message rejected: ", error_rc, stdin, NULL);
2484 /* Does not return */
2485
2486 /* Make a copy of the address, and remove any internal newlines. These
2487 may be present as a result of continuations of the header line. The
2488 white space that follows the newline must not be removed - it is part
2489 of the header. */
2490
2491 pp = recipient = store_get(ss - s + 1);
2492 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2493 *pp = 0;
2494
2495 #ifdef SUPPORT_I18N
2496 {
2497 BOOL b = allow_utf8_domains;
2498 allow_utf8_domains = TRUE;
2499 #endif
2500 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2501 &domain, FALSE);
2502
2503 #ifdef SUPPORT_I18N
2504 if (string_is_utf8(recipient))
2505 message_smtputf8 = TRUE;
2506 else
2507 allow_utf8_domains = b;
2508 }
2509 #endif
2510
2511 /* Keep a list of all the bad addresses so we can send a single
2512 error message at the end. However, an empty address is not an error;
2513 just ignore it. This can come from an empty group list like
2514
2515 To: Recipients of list:;
2516
2517 If there are no recipients at all, an error will occur later. */
2518
2519 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2520 {
2521 int len = Ustrlen(s);
2522 error_block *b = store_get(sizeof(error_block));
2523 while (len > 0 && isspace(s[len-1])) len--;
2524 b->next = NULL;
2525 b->text1 = string_printing(string_copyn(s, len));
2526 b->text2 = errmess;
2527 *bnext = b;
2528 bnext = &(b->next);
2529 }
2530
2531 /* If the recipient is already in the nonrecipients tree, it must
2532 have appeared on the command line with the option extract_addresses_
2533 remove_arguments set. Do not add it to the recipients, and keep a note
2534 that this has happened, in order to give a better error if there are
2535 no recipients left. */
2536
2537 else if (recipient != NULL)
2538 {
2539 if (tree_search(tree_nonrecipients, recipient) == NULL)
2540 receive_add_recipient(recipient, -1);
2541 else
2542 extracted_ignored = TRUE;
2543 }
2544
2545 /* Move on past this address */
2546
2547 s = ss + (*ss? 1:0);
2548 while (isspace(*s)) s++;
2549 } /* Next address */
2550
2551 parse_allow_group = FALSE; /* Reset group syntax flags */
2552 parse_found_group = FALSE;
2553
2554 /* If this was the bcc: header, mark it "old", which means it
2555 will be kept on the spool, but not transmitted as part of the
2556 message. */
2557
2558 if (h->type == htype_bcc) h->type = htype_old;
2559 } /* For appropriate header line */
2560 } /* For each header line */
2561
2562 }
2563
2564 /* Now build the unique message id. This has changed several times over the
2565 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2566 Retaining all the history in the comment has become too unwieldy - read
2567 previous release sources if you want it.
2568
2569 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2570 The first part is the current time, in seconds. The second part is the current
2571 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2572 can hold a number in the range 0-3843. It used to be a computed sequence
2573 number, but is now the fractional component of the current time in units of
2574 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2575 received, Exim ensures that the timer has ticked at the appropriate level
2576 before proceeding, to avoid duplication if the pid happened to be re-used
2577 within the same time period. It seems likely that most messages will take at
2578 least half a millisecond to be received, so no delay will normally be
2579 necessary. At least for some time...
2580
2581 There is a modification when localhost_number is set. Formerly this was allowed
2582 to be as large as 255. Now it is restricted to the range 0-16, and the final
2583 component of the message id becomes (localhost_number * 200) + fractional time
2584 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2585
2586 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2587 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2588 still allows the tttttt field to hold a large enough number to last for some
2589 more decades, and the final two-digit field can hold numbers up to 1295, which
2590 is enough for milliseconds (instead of 1/2000 of a second).
2591
2592 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2593 pid, so it is probably safe because pids have to be positive. The
2594 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2595 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2596
2597 Note that string_base62() returns its data in a static storage block, so it
2598 must be copied before calling string_base62() again. It always returns exactly
2599 6 characters.
2600
2601 There doesn't seem to be anything in the RFC which requires a message id to
2602 start with a letter, but Smail was changed to ensure this. The external form of
2603 the message id (as supplied by string expansion) therefore starts with an
2604 additional leading 'E'. The spool file names do not include this leading
2605 letter and it is not used internally.
2606
2607 NOTE: If ever the format of message ids is changed, the regular expression for
2608 checking that a string is in this format must be updated in a corresponding
2609 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2610 must also be changed to reflect the correct string length. The queue-sort code
2611 needs to know the layout. Then, of course, other programs that rely on the
2612 message id format will need updating too. */
2613
2614 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2615 message_id[6] = '-';
2616 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2617
2618 /* Deal with the case where the host number is set. The value of the number was
2619 checked when it was read, to ensure it isn't too big. The timing granularity is
2620 left in id_resolution so that an appropriate wait can be done after receiving
2621 the message, if necessary (we hope it won't be). */
2622
2623 if (host_number_string)
2624 {
2625 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2626 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2627 string_base62((long int)(
2628 host_number * (1000000/id_resolution) +
2629 message_id_tv.tv_usec/id_resolution)) + 4);
2630 }
2631
2632 /* Host number not set: final field is just the fractional time at an
2633 appropriate resolution. */
2634
2635 else
2636 {
2637 id_resolution = (BASE_62 == 62)? 500 : 1000;
2638 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2639 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2640 }
2641
2642 /* Add the current message id onto the current process info string if
2643 it will fit. */
2644
2645 (void)string_format(process_info + process_info_len,
2646 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2647
2648 /* If we are using multiple input directories, set up the one for this message
2649 to be the least significant base-62 digit of the time of arrival. Otherwise
2650 ensure that it is an empty string. */
2651
2652 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2653
2654 /* Now that we have the message-id, if there is no message-id: header, generate
2655 one, but only for local (without suppress_local_fixups) or submission mode
2656 messages. This can be user-configured if required, but we had better flatten
2657 any illegal characters therein. */
2658
2659 if ( !msgid_header
2660 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2661 {
2662 uschar *p;
2663 uschar *id_text = US"";
2664 uschar *id_domain = primary_hostname;
2665
2666 /* Permit only letters, digits, dots, and hyphens in the domain */
2667
2668 if (message_id_domain)
2669 {
2670 uschar *new_id_domain = expand_string(message_id_domain);
2671 if (!new_id_domain)
2672 {
2673 if (!expand_string_forcedfail)
2674 log_write(0, LOG_MAIN|LOG_PANIC,
2675 "expansion of \"%s\" (message_id_header_domain) "
2676 "failed: %s", message_id_domain, expand_string_message);
2677 }
2678 else if (*new_id_domain)
2679 {
2680 id_domain = new_id_domain;
2681 for (p = id_domain; *p; p++)
2682 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2683 }
2684 }
2685
2686 /* Permit all characters except controls and RFC 2822 specials in the
2687 additional text part. */
2688
2689 if (message_id_text)
2690 {
2691 uschar *new_id_text = expand_string(message_id_text);
2692 if (!new_id_text)
2693 {
2694 if (!expand_string_forcedfail)
2695 log_write(0, LOG_MAIN|LOG_PANIC,
2696 "expansion of \"%s\" (message_id_header_text) "
2697 "failed: %s", message_id_text, expand_string_message);
2698 }
2699 else if (*new_id_text)
2700 {
2701 id_text = new_id_text;
2702 for (p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2703 }
2704 }
2705
2706 /* Add the header line
2707 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2708 * appended, to preserve classical expectations of header ordering. */
2709
2710 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2711 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2712 (*id_text == 0)? "" : ".", id_text, id_domain);
2713 }
2714
2715 /* If we are to log recipients, keep a copy of the raw ones before any possible
2716 rewriting. Must copy the count, because later ACLs and the local_scan()
2717 function may mess with the real recipients. */
2718
2719 if (LOGGING(received_recipients))
2720 {
2721 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2722 for (i = 0; i < recipients_count; i++)
2723 raw_recipients[i] = string_copy(recipients_list[i].address);
2724 raw_recipients_count = recipients_count;
2725 }
2726
2727 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2728 recipients will get here only if the conditions were right (allow_unqualified_
2729 recipient is TRUE). */
2730
2731 for (i = 0; i < recipients_count; i++)
2732 recipients_list[i].address =
2733 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2734 global_rewrite_rules, rewrite_existflags);
2735
2736 /* If there is no From: header, generate one for local (without
2737 suppress_local_fixups) or submission_mode messages. If there is no sender
2738 address, but the sender is local or this is a local delivery error, use the
2739 originator login. This shouldn't happen for genuine bounces, but might happen
2740 for autoreplies. The addition of From: must be done *before* checking for the
2741 possible addition of a Sender: header, because untrusted_set_sender allows an
2742 untrusted user to set anything in the envelope (which might then get info
2743 From:) but we still want to ensure a valid Sender: if it is required. */
2744
2745 if ( !from_header
2746 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2747 {
2748 uschar *oname = US"";
2749
2750 /* Use the originator_name if this is a locally submitted message and the
2751 caller is not trusted. For trusted callers, use it only if -F was used to
2752 force its value or if we have a non-SMTP message for which -f was not used
2753 to set the sender. */
2754
2755 if (!sender_host_address)
2756 {
2757 if (!trusted_caller || sender_name_forced ||
2758 (!smtp_input && !sender_address_forced))
2759 oname = originator_name;
2760 }
2761
2762 /* For non-locally submitted messages, the only time we use the originator
2763 name is when it was forced by the /name= option on control=submission. */
2764
2765 else if (submission_name) oname = submission_name;
2766
2767 /* Envelope sender is empty */
2768
2769 if (!*sender_address)
2770 {
2771 uschar *fromstart, *fromend;
2772
2773 fromstart = string_sprintf("%sFrom: %s%s",
2774 resent_prefix, oname, *oname ? " <" : "");
2775 fromend = *oname ? US">" : US"";
2776
2777 if (sender_local || local_error_message)
2778 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2779 local_part_quote(originator_login), qualify_domain_sender,
2780 fromend);
2781
2782 else if (submission_mode && authenticated_id)
2783 {
2784 if (!submission_domain)
2785 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2786 local_part_quote(authenticated_id), qualify_domain_sender,
2787 fromend);
2788
2789 else if (!*submission_domain) /* empty => whole address set */
2790 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2791 fromend);
2792
2793 else
2794 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2795 local_part_quote(authenticated_id), submission_domain, fromend);
2796
2797 from_header = header_last; /* To get it checked for Sender: */
2798 }
2799 }
2800
2801 /* There is a non-null envelope sender. Build the header using the original
2802 sender address, before any rewriting that might have been done while
2803 verifying it. */
2804
2805 else
2806 {
2807 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2808 oname,
2809 *oname ? " <" : "",
2810 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2811 *oname ? ">" : "");
2812
2813 from_header = header_last; /* To get it checked for Sender: */
2814 }
2815 }
2816
2817
2818 /* If the sender is local (without suppress_local_fixups), or if we are in
2819 submission mode and there is an authenticated_id, check that an existing From:
2820 is correct, and if not, generate a Sender: header, unless disabled. Any
2821 previously-existing Sender: header was removed above. Note that sender_local,
2822 as well as being TRUE if the caller of exim is not trusted, is also true if a
2823 trusted caller did not supply a -f argument for non-smtp input. To allow
2824 trusted callers to forge From: without supplying -f, we have to test explicitly
2825 here. If the From: header contains more than one address, then the call to
2826 parse_extract_address fails, and a Sender: header is inserted, as required. */
2827
2828 if ( from_header
2829 && ( active_local_from_check
2830 && ( sender_local && !trusted_caller && !suppress_local_fixups
2831 || submission_mode && authenticated_id
2832 ) ) )
2833 {
2834 BOOL make_sender = TRUE;
2835 int start, end, domain;
2836 uschar *errmess;
2837 uschar *from_address =
2838 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2839 &start, &end, &domain, FALSE);
2840 uschar *generated_sender_address;
2841
2842 generated_sender_address = submission_mode
2843 ? !submission_domain
2844 ? string_sprintf("%s@%s",
2845 local_part_quote(authenticated_id), qualify_domain_sender)
2846 : !*submission_domain /* empty => full address */
2847 ? string_sprintf("%s", authenticated_id)
2848 : string_sprintf("%s@%s",
2849 local_part_quote(authenticated_id), submission_domain)
2850 : string_sprintf("%s@%s",
2851 local_part_quote(originator_login), qualify_domain_sender);
2852
2853 /* Remove permitted prefixes and suffixes from the local part of the From:
2854 address before doing the comparison with the generated sender. */
2855
2856 if (from_address)
2857 {
2858 int slen;
2859 uschar *at = domain ? from_address + domain - 1 : NULL;
2860
2861 if (at) *at = 0;
2862 from_address += route_check_prefix(from_address, local_from_prefix);
2863 slen = route_check_suffix(from_address, local_from_suffix);
2864 if (slen > 0)
2865 {
2866 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2867 from_address += slen;
2868 }
2869 if (at) *at = '@';
2870
2871 if ( strcmpic(generated_sender_address, from_address) == 0
2872 || (!domain && strcmpic(from_address, originator_login) == 0))
2873 make_sender = FALSE;
2874 }
2875
2876 /* We have to cause the Sender header to be rewritten if there are
2877 appropriate rewriting rules. */
2878
2879 if (make_sender)
2880 if (submission_mode && !submission_name)
2881 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2882 generated_sender_address);
2883 else
2884 header_add(htype_sender, "%sSender: %s <%s>\n",
2885 resent_prefix,
2886 submission_mode? submission_name : originator_name,
2887 generated_sender_address);
2888
2889 /* Ensure that a non-null envelope sender address corresponds to the
2890 submission mode sender address. */
2891
2892 if (submission_mode && *sender_address)
2893 {
2894 if (!sender_address_unrewritten)
2895 sender_address_unrewritten = sender_address;
2896 sender_address = generated_sender_address;
2897 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2898 log_write(L_address_rewrite, LOG_MAIN,
2899 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2900 sender_address_unrewritten, generated_sender_address);
2901 }
2902 }
2903
2904 /* If there are any rewriting rules, apply them to the sender address, unless
2905 it has already been rewritten as part of verification for SMTP input. */
2906
2907 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2908 {
2909 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2910 global_rewrite_rules, rewrite_existflags);
2911 DEBUG(D_receive|D_rewrite)
2912 debug_printf("rewritten sender = %s\n", sender_address);
2913 }
2914
2915
2916 /* The headers must be run through rewrite_header(), because it ensures that
2917 addresses are fully qualified, as well as applying any rewriting rules that may
2918 exist.
2919
2920 Qualification of header addresses in a message from a remote host happens only
2921 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2922 appropriate. For local messages, qualification always happens, unless -bnq is
2923 used to explicitly suppress it. No rewriting is done for an unqualified address
2924 that is left untouched.
2925
2926 We start at the second header, skipping our own Received:. This rewriting is
2927 documented as happening *after* recipient addresses are taken from the headers
2928 by the -t command line option. An added Sender: gets rewritten here. */
2929
2930 for (h = header_list->next; h; h = h->next)
2931 {
2932 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2933 rewrite_existflags, TRUE);
2934 if (newh) h = newh;
2935 }
2936
2937
2938 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2939 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2940 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2941 exists, this applies to the set of resent- headers rather than the normal set.
2942
2943 The requirement for a recipient header has been removed in RFC 2822. At this
2944 point in the code, earlier versions of Exim added a To: header for locally
2945 submitted messages, and an empty Bcc: header for others. In the light of the
2946 changes in RFC 2822, this was dropped in November 2003. */
2947
2948
2949 /* If there is no date header, generate one if the message originates locally
2950 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2951 submission mode flag is set. Messages without Date: are not valid, but it seems
2952 to be more confusing if Exim adds one to all remotely-originated messages.
2953 As per Message-Id, we prepend if resending, else append.
2954 */
2955
2956 if ( !date_header_exists
2957 && ((!sender_host_address && !suppress_local_fixups) || 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; 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 Having created it, send the headers to the destination. */
2996
2997 if (cutthrough.fd >= 0 && cutthrough.delivery)
2998 {
2999 if (received_count > received_headers_max)
3000 {
3001 cancel_cutthrough_connection(TRUE, US"too many headers");
3002 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3003 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3004 "Too many \"Received\" headers",
3005 sender_address,
3006 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3007 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3008 message_id[0] = 0; /* Indicate no message accepted */
3009 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3010 goto TIDYUP; /* Skip to end of function */
3011 }
3012 received_header_gen();
3013 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3014 (void) cutthrough_headers_send();
3015 }
3016
3017
3018 /* Open a new spool file for the data portion of the message. We need
3019 to access it both via a file descriptor and a stream. Try to make the
3020 directory if it isn't there. */
3021
3022 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3023 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3024
3025 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3026 {
3027 if (errno == ENOENT)
3028 {
3029 (void) directory_make(spool_directory,
3030 spool_sname(US"input", message_subdir),
3031 INPUT_DIRECTORY_MODE, TRUE);
3032 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3033 }
3034 if (data_fd < 0)
3035 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3036 spool_name, strerror(errno));
3037 }
3038
3039 /* Make sure the file's group is the Exim gid, and double-check the mode
3040 because the group setting doesn't always get set automatically. */
3041
3042 if (fchown(data_fd, exim_uid, exim_gid))
3043 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3044 "Failed setting ownership on spool file %s: %s",
3045 spool_name, strerror(errno));
3046 (void)fchmod(data_fd, SPOOL_MODE);
3047
3048 /* We now have data file open. Build a stream for it and lock it. We lock only
3049 the first line of the file (containing the message ID) because otherwise there
3050 are problems when Exim is run under Cygwin (I'm told). See comments in
3051 spool_in.c, where the same locking is done. */
3052
3053 data_file = fdopen(data_fd, "w+");
3054 lock_data.l_type = F_WRLCK;
3055 lock_data.l_whence = SEEK_SET;
3056 lock_data.l_start = 0;
3057 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3058
3059 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3060 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3061 errno, strerror(errno));
3062
3063 /* We have an open, locked data file. Write the message id to it to make it
3064 self-identifying. Then read the remainder of the input of this message and
3065 write it to the data file. If the variable next != NULL, it contains the first
3066 data line (which was read as a header but then turned out not to have the right
3067 format); write it (remembering that it might contain binary zeros). The result
3068 of fwrite() isn't inspected; instead we call ferror() below. */
3069
3070 fprintf(data_file, "%s-D\n", message_id);
3071 if (next)
3072 {
3073 uschar *s = next->text;
3074 int len = next->slen;
3075 if (fwrite(s, 1, len, data_file) == len) /* "if" for compiler quietening */
3076 body_linecount++; /* Assumes only 1 line */
3077 }
3078
3079 /* Note that we might already be at end of file, or the logical end of file
3080 (indicated by '.'), or might have encountered an error while writing the
3081 message id or "next" line. */
3082
3083 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3084 {
3085 if (smtp_input)
3086 {
3087 message_ended = chunking_state <= CHUNKING_OFFERED
3088 ? read_message_data_smtp(data_file)
3089 : spool_wireformat
3090 ? read_message_bdat_smtp_wire(data_file)
3091 : read_message_bdat_smtp(data_file);
3092 receive_linecount++; /* The terminating "." line */
3093 }
3094 else
3095 message_ended = read_message_data(data_file);
3096
3097 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3098 message_linecount += body_linecount;
3099
3100 switch (message_ended)
3101 {
3102 /* Handle premature termination of SMTP */
3103
3104 case END_EOF:
3105 if (smtp_input)
3106 {
3107 Uunlink(spool_name); /* Lose data file when closed */
3108 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3109 message_id[0] = 0; /* Indicate no message accepted */
3110 smtp_reply = handle_lost_connection(US"");
3111 smtp_yield = FALSE;
3112 goto TIDYUP; /* Skip to end of function */
3113 }
3114 break;
3115
3116 /* Handle message that is too big. Don't use host_or_ident() in the log
3117 message; we want to see the ident value even for non-remote messages. */
3118
3119 case END_SIZE:
3120 Uunlink(spool_name); /* Lose the data file when closed */
3121 cancel_cutthrough_connection(TRUE, US"mail too big");
3122 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3123
3124 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3125 "message too big: read=%d max=%d",
3126 sender_address,
3127 sender_fullhost ? " H=" : "",
3128 sender_fullhost ? sender_fullhost : US"",
3129 sender_ident ? " U=" : "",
3130 sender_ident ? sender_ident : US"",
3131 message_size,
3132 thismessage_size_limit);
3133
3134 if (smtp_input)
3135 {
3136 smtp_reply = US"552 Message size exceeds maximum permitted";
3137 message_id[0] = 0; /* Indicate no message accepted */
3138 goto TIDYUP; /* Skip to end of function */
3139 }
3140 else
3141 {
3142 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3143 give_local_error(ERRMESS_TOOBIG,
3144 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3145 US"message rejected: ", error_rc, data_file, header_list);
3146 /* Does not return */
3147 }
3148 break;
3149
3150 /* Handle bad BDAT protocol sequence */
3151
3152 case END_PROTOCOL:
3153 Uunlink(spool_name); /* Lose the data file when closed */
3154 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3155 smtp_reply = US""; /* Response already sent */
3156 message_id[0] = 0; /* Indicate no message accepted */
3157 goto TIDYUP; /* Skip to end of function */
3158 }
3159 }
3160
3161 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3162 example, there may be some expansion in an ACL that uses a timer.) */
3163
3164 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3165
3166 /* The message body has now been read into the data file. Call fflush() to
3167 empty the buffers in C, and then call fsync() to get the data written out onto
3168 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3169 having to do this). If there was an I/O error on either input or output,
3170 attempt to send an error message, and unlink the spool file. For non-SMTP input
3171 we can then give up. Note that for SMTP input we must swallow the remainder of
3172 the input in cases of output errors, since the far end doesn't expect to see
3173 anything until the terminating dot line is sent. */
3174
3175 if (fflush(data_file) == EOF || ferror(data_file) ||
3176 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3177 {
3178 uschar *msg_errno = US strerror(errno);
3179 BOOL input_error = (receive_ferror)() != 0;
3180 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3181 input_error? "Input read" : "Spool write",
3182 msg_errno,
3183 sender_fullhost ? sender_fullhost : sender_ident);
3184
3185 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3186 Uunlink(spool_name); /* Lose the data file */
3187 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3188
3189 if (smtp_input)
3190 {
3191 if (input_error)
3192 smtp_reply = US"451 Error while reading input data";
3193 else
3194 {
3195 smtp_reply = US"451 Error while writing spool file";
3196 receive_swallow_smtp();
3197 }
3198 message_id[0] = 0; /* Indicate no message accepted */
3199 goto TIDYUP; /* Skip to end of function */
3200 }
3201
3202 else
3203 {
3204 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3205 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3206 header_list);
3207 /* Does not return */
3208 }
3209 }
3210
3211
3212 /* No I/O errors were encountered while writing the data file. */
3213
3214 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3215 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3216
3217
3218 /* If there were any bad addresses extracted by -t, or there were no recipients
3219 left after -t, send a message to the sender of this message, or write it to
3220 stderr if the error handling option is set that way. Note that there may
3221 legitimately be no recipients for an SMTP message if they have all been removed
3222 by "discard".
3223
3224 We need to rewind the data file in order to read it. In the case of no
3225 recipients or stderr error writing, throw the data file away afterwards, and
3226 exit. (This can't be SMTP, which always ensures there's at least one
3227 syntactically good recipient address.) */
3228
3229 if (extract_recip && (bad_addresses || recipients_count == 0))
3230 {
3231 DEBUG(D_receive)
3232 {
3233 if (recipients_count == 0) debug_printf("*** No recipients\n");
3234 if (bad_addresses)
3235 {
3236 error_block *eblock = bad_addresses;
3237 debug_printf("*** Bad address(es)\n");
3238 while (eblock != NULL)
3239 {
3240 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3241 eblock = eblock->next;
3242 }
3243 }
3244 }
3245
3246 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3247
3248 /* If configured to send errors to the sender, but this fails, force
3249 a failure error code. We use a special one for no recipients so that it
3250 can be detected by the autoreply transport. Otherwise error_rc is set to
3251 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3252 it is EXIT_SUCCESS. */
3253
3254 if (error_handling == ERRORS_SENDER)
3255 {
3256 if (!moan_to_sender(
3257 (bad_addresses == NULL)?
3258 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3259 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3260 bad_addresses, header_list, data_file, FALSE))
3261 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3262 }
3263 else
3264 {
3265 if (!bad_addresses)
3266 if (extracted_ignored)
3267 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3268 else
3269 fprintf(stderr, "exim: no recipients in message\n");
3270 else
3271 {
3272 fprintf(stderr, "exim: invalid address%s",
3273 bad_addresses->next ? "es:\n" : ":");
3274 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3275 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3276 bad_addresses->text2);
3277 }
3278 }
3279
3280 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3281 {
3282 Uunlink(spool_name);
3283 (void)fclose(data_file);
3284 exim_exit(error_rc, US"receiving");
3285 }
3286 }
3287
3288 /* Data file successfully written. Generate text for the Received: header by
3289 expanding the configured string, and adding a timestamp. By leaving this
3290 operation till now, we ensure that the timestamp is the time that message
3291 reception was completed. However, this is deliberately done before calling the
3292 data ACL and local_scan().
3293
3294 This Received: header may therefore be inspected by the data ACL and by code in
3295 the local_scan() function. When they have run, we update the timestamp to be
3296 the final time of reception.
3297
3298 If there is just one recipient, set up its value in the $received_for variable
3299 for use when we generate the Received: header.
3300
3301 Note: the checking for too many Received: headers is handled by the delivery
3302 code. */
3303 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3304
3305 if (!received_header->text) /* Non-cutthrough case */
3306 {
3307 received_header_gen();
3308
3309 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3310
3311 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3312 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3313
3314 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3315 now, before running the DATA ACL. */
3316
3317 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3318 }
3319 else
3320 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3321 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3322
3323 /* If an ACL is specified for checking things at this stage of reception of a
3324 message, run it, unless all the recipients were removed by "discard" in earlier
3325 ACLs. That is the only case in which recipients_count can be zero at this
3326 stage. Set deliver_datafile to point to the data file so that $message_body and
3327 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3328 */
3329
3330 deliver_datafile = data_fd;
3331 user_msg = NULL;
3332
3333 enable_dollar_recipients = TRUE;
3334
3335 if (recipients_count == 0)
3336 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3337
3338 else
3339 {
3340 /* Handle interactive SMTP messages */
3341
3342 if (smtp_input && !smtp_batched_input)
3343 {
3344
3345 #ifndef DISABLE_DKIM
3346 if (!dkim_disable_verify)
3347 {
3348 /* Finish verification */
3349 dkim_exim_verify_finish();
3350
3351 /* Check if we must run the DKIM ACL */
3352 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3353 {
3354 uschar * dkim_verify_signers_expanded =
3355 expand_string(dkim_verify_signers);
3356 gstring * results = NULL;
3357 int signer_sep = 0;
3358 const uschar * ptr;
3359 uschar * item;
3360 gstring * seen_items = NULL;
3361 int old_pool = store_pool;
3362
3363 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3364
3365 if (!(ptr = dkim_verify_signers_expanded))
3366 log_write(0, LOG_MAIN|LOG_PANIC,
3367 "expansion of dkim_verify_signers option failed: %s",
3368 expand_string_message);
3369
3370 /* Default to OK when no items are present */
3371 rc = OK;
3372 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3373 {
3374 /* Prevent running ACL for an empty item */
3375 if (!item || !*item) continue;
3376
3377 /* Only run ACL once for each domain or identity,
3378 no matter how often it appears in the expanded list. */
3379 if (seen_items)
3380 {
3381 uschar * seen_item;
3382 const uschar * seen_items_list = string_from_gstring(seen_items);
3383 int seen_sep = ':';
3384 BOOL seen_this_item = FALSE;
3385
3386 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3387 NULL, 0)))
3388 if (Ustrcmp(seen_item,item) == 0)
3389 {
3390 seen_this_item = TRUE;
3391 break;
3392 }
3393
3394 if (seen_this_item)
3395 {
3396 DEBUG(D_receive)
3397 debug_printf("acl_smtp_dkim: skipping signer %s, "
3398 "already seen\n", item);
3399 continue;
3400 }
3401
3402 seen_items = string_catn(seen_items, US":", 1);
3403 }
3404 seen_items = string_cat(seen_items, item);
3405
3406 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3407 if (rc != OK)
3408 {
3409 DEBUG(D_receive)
3410 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3411 "skipping remaining items\n", rc, item);
3412 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3413 break;
3414 }
3415 }
3416 dkim_verify_status = string_from_gstring(results);
3417 store_pool = old_pool;
3418 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3419 if (rc == DISCARD)
3420 {
3421 recipients_count = 0;
3422 blackholed_by = US"DKIM ACL";
3423 if (log_msg)
3424 blackhole_log_msg = string_sprintf(": %s", log_msg);
3425 }
3426 else if (rc != OK)
3427 {
3428 Uunlink(spool_name);
3429 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3430 smtp_yield = FALSE; /* No more messages after dropped connection */
3431 smtp_reply = US""; /* Indicate reply already sent */
3432 message_id[0] = 0; /* Indicate no message accepted */
3433 goto TIDYUP; /* Skip to end of function */
3434 }
3435 }
3436 else
3437 dkim_exim_verify_log_all();
3438 }
3439 #endif /* DISABLE_DKIM */
3440
3441 #ifdef WITH_CONTENT_SCAN
3442 if ( recipients_count > 0
3443 && acl_smtp_mime
3444 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3445 )
3446 goto TIDYUP;
3447 #endif /* WITH_CONTENT_SCAN */
3448
3449 #ifdef EXPERIMENTAL_DMARC
3450 dmarc_up = dmarc_store_data(from_header);
3451 #endif /* EXPERIMENTAL_DMARC */
3452
3453 #ifndef DISABLE_PRDR
3454 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3455 {
3456 unsigned int c;
3457 int all_pass = OK;
3458 int all_fail = FAIL;
3459
3460 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3461 /* Loop through recipients, responses must be in same order received */
3462 for (c = 0; recipients_count > c; c++)
3463 {
3464 uschar * addr= recipients_list[c].address;
3465 uschar * msg= US"PRDR R=<%s> %s";
3466 uschar * code;
3467 DEBUG(D_receive)
3468 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3469 addr, c+1, recipients_count);
3470 rc = acl_check(ACL_WHERE_PRDR, addr,
3471 acl_smtp_data_prdr, &user_msg, &log_msg);
3472
3473 /* If any recipient rejected content, indicate it in final message */
3474 all_pass |= rc;
3475 /* If all recipients rejected, indicate in final message */
3476 all_fail &= rc;
3477
3478 switch (rc)
3479 {
3480 case OK: case DISCARD: code = US"250"; break;
3481 case DEFER: code = US"450"; break;
3482 default: code = US"550"; break;
3483 }
3484 if (user_msg != NULL)
3485 smtp_user_msg(code, user_msg);
3486 else
3487 {
3488 switch (rc)
3489 {
3490 case OK: case DISCARD:
3491 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3492 case DEFER:
3493 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3494 default:
3495 msg = string_sprintf(CS msg, addr, "refusal"); break;
3496 }
3497 smtp_user_msg(code, msg);
3498 }
3499 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3500 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3501 else log_write(0, LOG_MAIN, "%s", CS msg);
3502
3503 if (rc != OK) { receive_remove_recipient(addr); c--; }
3504 }
3505 /* Set up final message, used if data acl gives OK */
3506 smtp_reply = string_sprintf("%s id=%s message %s",
3507 all_fail == FAIL ? US"550" : US"250",
3508 message_id,
3509 all_fail == FAIL
3510 ? US"rejected for all recipients"
3511 : all_pass == OK
3512 ? US"accepted"
3513 : US"accepted for some recipients");
3514 if (recipients_count == 0)
3515 {
3516 message_id[0] = 0; /* Indicate no message accepted */
3517 goto TIDYUP;
3518 }
3519 }
3520 else
3521 prdr_requested = FALSE;
3522 #endif /* !DISABLE_PRDR */
3523
3524 /* Check the recipients count again, as the MIME ACL might have changed
3525 them. */
3526
3527 if (acl_smtp_data != NULL && recipients_count > 0)
3528 {
3529 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3530 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3531 if (rc == DISCARD)
3532 {
3533 recipients_count = 0;
3534 blackholed_by = US"DATA ACL";
3535 if (log_msg)
3536 blackhole_log_msg = string_sprintf(": %s", log_msg);
3537 cancel_cutthrough_connection(TRUE, US"data acl discard");
3538 }
3539 else if (rc != OK)
3540 {
3541 Uunlink(spool_name);
3542 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3543 #ifdef WITH_CONTENT_SCAN
3544 unspool_mbox();
3545 #endif
3546 #ifdef EXPERIMENTAL_DCC
3547 dcc_ok = 0;
3548 #endif
3549 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3550 smtp_yield = FALSE; /* No more messages after dropped connection */
3551 smtp_reply = US""; /* Indicate reply already sent */
3552 message_id[0] = 0; /* Indicate no message accepted */
3553 goto TIDYUP; /* Skip to end of function */
3554 }
3555 }
3556 }
3557
3558 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3559 we cannot take different actions for permanent and temporary rejections. */
3560
3561 else
3562 {
3563
3564 #ifdef WITH_CONTENT_SCAN
3565 if ( acl_not_smtp_mime
3566 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3567 &blackholed_by)
3568 )
3569 goto TIDYUP;
3570 #endif /* WITH_CONTENT_SCAN */
3571
3572 if (acl_not_smtp)
3573 {
3574 uschar *user_msg, *log_msg;
3575 authentication_local = TRUE;
3576 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3577 if (rc == DISCARD)
3578 {
3579 recipients_count = 0;
3580 blackholed_by = US"non-SMTP ACL";
3581 if (log_msg)
3582 blackhole_log_msg = string_sprintf(": %s", log_msg);
3583 }
3584 else if (rc != OK)
3585 {
3586 Uunlink(spool_name);
3587 #ifdef WITH_CONTENT_SCAN
3588 unspool_mbox();
3589 #endif
3590 #ifdef EXPERIMENTAL_DCC
3591 dcc_ok = 0;
3592 #endif
3593 /* The ACL can specify where rejections are to be logged, possibly
3594 nowhere. The default is main and reject logs. */
3595
3596 if (log_reject_target)
3597 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3598 sender_address, log_msg);
3599
3600 if (!user_msg) user_msg = US"local configuration problem";
3601 if (smtp_batched_input)
3602 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3603 /* Does not return */
3604 else
3605 {
3606 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3607 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3608 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3609 header_list);
3610 /* Does not return */
3611 }
3612 }
3613 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3614 }
3615 }
3616
3617 /* The applicable ACLs have been run */
3618
3619 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3620 if (queue_only_policy) queued_by = US"ACL";
3621 }
3622
3623 #ifdef WITH_CONTENT_SCAN
3624 unspool_mbox();
3625 #endif
3626
3627 #ifdef EXPERIMENTAL_DCC
3628 dcc_ok = 0;
3629 #endif
3630
3631
3632 #ifdef HAVE_LOCAL_SCAN
3633 /* The final check on the message is to run the scan_local() function. The
3634 version supplied with Exim always accepts, but this is a hook for sysadmins to
3635 supply their own checking code. The local_scan() function is run even when all
3636 the recipients have been discarded. */
3637
3638 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3639
3640 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3641 deleted, and the incident gets logged. */
3642
3643 if (sigsetjmp(local_scan_env, 1) == 0)
3644 {
3645 had_local_scan_crash = 0;
3646 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3647 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3648 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3649 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3650
3651 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3652 local_scan_timeout);
3653 local_scan_data = NULL;
3654
3655 had_local_scan_timeout = 0;
3656 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3657 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3658 rc = local_scan(data_fd, &local_scan_data);
3659 alarm(0);
3660 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3661
3662 enable_dollar_recipients = FALSE;
3663
3664 store_pool = POOL_MAIN; /* In case changed */
3665 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3666 local_scan_data);
3667
3668 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3669 os_non_restarting_signal(SIGFPE, SIG_DFL);
3670 os_non_restarting_signal(SIGILL, SIG_DFL);
3671 os_non_restarting_signal(SIGBUS, SIG_DFL);
3672 }
3673 else
3674 {
3675 if (had_local_scan_crash)
3676 {
3677 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3678 "signal %d - message temporarily rejected (size %d)",
3679 had_local_scan_crash, message_size);
3680 receive_bomb_out(US"local-scan-error", US"local verification problem");
3681 /* Does not return */
3682 }
3683 if (had_local_scan_timeout)
3684 {
3685 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3686 "message temporarily rejected (size %d)", message_size);
3687 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3688 /* Does not return */
3689 }
3690 }
3691
3692 /* The length check is paranoia against some runaway code, and also because
3693 (for a success return) lines in the spool file are read into big_buffer. */
3694
3695 if (local_scan_data)
3696 {
3697 int len = Ustrlen(local_scan_data);
3698 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3699 local_scan_data = string_copyn(local_scan_data, len);
3700 }
3701
3702 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3703 {
3704 if (!deliver_freeze) /* ACL might have already frozen */
3705 {
3706 deliver_freeze = TRUE;
3707 deliver_frozen_at = time(NULL);
3708 frozen_by = US"local_scan()";
3709 }
3710 rc = LOCAL_SCAN_ACCEPT;
3711 }
3712 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3713 {
3714 if (!queue_only_policy) /* ACL might have already queued */
3715 {
3716 queue_only_policy = TRUE;
3717 queued_by = US"local_scan()";
3718 }
3719 rc = LOCAL_SCAN_ACCEPT;
3720 }
3721
3722 /* Message accepted: remove newlines in local_scan_data because otherwise
3723 the spool file gets corrupted. Ensure that all recipients are qualified. */
3724
3725 if (rc == LOCAL_SCAN_ACCEPT)
3726 {
3727 if (local_scan_data)
3728 {
3729 uschar *s;
3730 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3731 }
3732 for (i = 0; i < recipients_count; i++)
3733 {
3734 recipient_item *r = recipients_list + i;
3735 r->address = rewrite_address_qualify(r->address, TRUE);
3736 if (r->errors_to != NULL)
3737 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3738 }
3739 if (recipients_count == 0 && blackholed_by == NULL)
3740 blackholed_by = US"local_scan";
3741 }
3742
3743 /* Message rejected: newlines permitted in local_scan_data to generate
3744 multiline SMTP responses. */
3745
3746 else
3747 {
3748 uschar *istemp = US"";
3749 uschar *smtp_code;
3750 gstring * g;
3751
3752 errmsg = local_scan_data;
3753
3754 Uunlink(spool_name); /* Cancel this message */
3755 switch(rc)
3756 {
3757 default:
3758 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3759 "rejection given", rc);
3760 goto TEMPREJECT;
3761
3762 case LOCAL_SCAN_REJECT_NOLOGHDR:
3763 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3764 /* Fall through */
3765
3766 case LOCAL_SCAN_REJECT:
3767 smtp_code = US"550";
3768 if (!errmsg) errmsg = US"Administrative prohibition";
3769 break;
3770
3771 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3772 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3773 /* Fall through */
3774
3775 case LOCAL_SCAN_TEMPREJECT:
3776 TEMPREJECT:
3777 smtp_code = US"451";
3778 if (!errmsg) errmsg = US"Temporary local problem";
3779 istemp = US"temporarily ";
3780 break;
3781 }
3782
3783 g = string_append(NULL, 2, US"F=",
3784 sender_address[0] == 0 ? US"<>" : sender_address);
3785 g = add_host_info_for_log(g);
3786
3787 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3788 string_from_gstring(g), istemp, string_printing(errmsg));
3789
3790 if (smtp_input)
3791 {
3792 if (!smtp_batched_input)
3793 {
3794 smtp_respond(smtp_code, 3, TRUE, errmsg);
3795 message_id[0] = 0; /* Indicate no message accepted */
3796 smtp_reply = US""; /* Indicate reply already sent */
3797 goto TIDYUP; /* Skip to end of function */
3798 }
3799 else
3800 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3801 /* Does not return */
3802 }
3803 else
3804 {
3805 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3806 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3807 US"message rejected by local scan code: ", error_rc, data_file,
3808 header_list);
3809 /* Does not return */
3810 }
3811 }
3812
3813 /* Reset signal handlers to ignore signals that previously would have caused
3814 the message to be abandoned. */
3815
3816 signal(SIGTERM, SIG_IGN);
3817 signal(SIGINT, SIG_IGN);
3818 #endif /* HAVE_LOCAL_SCAN */
3819
3820
3821 /* Ensure the first time flag is set in the newly-received message. */
3822
3823 deliver_firsttime = TRUE;
3824
3825 #ifdef EXPERIMENTAL_BRIGHTMAIL
3826 if (bmi_run == 1)
3827 { /* rewind data file */
3828 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3829 bmi_verdicts = bmi_process_message(header_list, data_fd);
3830 }
3831 #endif
3832
3833 /* Update the timestamp in our Received: header to account for any time taken by
3834 an ACL or by local_scan(). The new time is the time that all reception
3835 processing is complete. */
3836
3837 timestamp = expand_string(US"${tod_full}");
3838 tslen = Ustrlen(timestamp);
3839
3840 memcpy(received_header->text + received_header->slen - tslen - 1,
3841 timestamp, tslen);
3842
3843 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3844
3845 if (mua_wrapper)
3846 {
3847 deliver_freeze = FALSE;
3848 queue_only_policy = FALSE;
3849 }
3850
3851 /* Keep the data file open until we have written the header file, in order to
3852 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3853 don't write the header file, and we unlink the data file. If writing the header
3854 file fails, we have failed to accept this message. */
3855
3856 if (host_checking || blackholed_by)
3857 {
3858 header_line *h;
3859 Uunlink(spool_name);
3860 msg_size = 0; /* Compute size for log line */
3861 for (h = header_list; h; h = h->next)
3862 if (h->type != '*') msg_size += h->slen;
3863 }
3864
3865 /* Write the -H file */
3866
3867 else
3868 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3869 {
3870 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3871 Uunlink(spool_name); /* Lose the data file */
3872
3873 if (smtp_input)
3874 {
3875 smtp_reply = US"451 Error in writing spool file";
3876 message_id[0] = 0; /* Indicate no message accepted */
3877 goto TIDYUP;
3878 }
3879 else
3880 {
3881 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3882 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3883 header_list);
3884 /* Does not return */
3885 }
3886 }
3887
3888
3889 /* The message has now been successfully received. */
3890
3891 receive_messagecount++;
3892
3893 /* In SMTP sessions we may receive several in one connection. After each one,
3894 we wait for the clock to tick at the level of message-id granularity. This is
3895 so that the combination of time+pid is unique, even on systems where the pid
3896 can be re-used within our time interval. We can't shorten the interval without
3897 re-designing the message-id. See comments above where the message id is
3898 created. This is Something For The Future. */
3899
3900 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3901 exim_wait_tick(&message_id_tv, id_resolution);
3902
3903 /* Add data size to written header size. We do not count the initial file name
3904 that is in the file, but we do add one extra for the notional blank line that
3905 precedes the data. This total differs from message_size in that it include the
3906 added Received: header and any other headers that got created locally. */
3907
3908 if (fflush(data_file))
3909 {
3910 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3911 log_write(0, LOG_MAIN, "%s\n", errmsg);
3912 Uunlink(spool_name); /* Lose the data file */
3913
3914 if (smtp_input)
3915 {
3916 smtp_reply = US"451 Error in writing spool file";
3917 message_id[0] = 0; /* Indicate no message accepted */
3918 goto TIDYUP;
3919 }
3920 else
3921 {
3922 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3923 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3924 header_list);
3925 /* Does not return */
3926 }
3927 }
3928 fstat(data_fd, &statbuf);
3929
3930 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3931
3932 /* Generate a "message received" log entry. We do this by building up a dynamic
3933 string as required. We log the arrival of a new message while the
3934 file is still locked, just in case the machine is *really* fast, and delivers
3935 it first! Include any message id that is in the message - since the syntax of a
3936 message id is actually an addr-spec, we can use the parse routine to canonicalize
3937 it. */
3938
3939 g = string_get(256);
3940
3941 g = string_append(g, 2,
3942 fake_response == FAIL ? US"(= " : US"<= ",
3943 sender_address[0] == 0 ? US"<>" : sender_address);
3944 if (message_reference)
3945 g = string_append(g, 2, US" R=", message_reference);
3946
3947 g = add_host_info_for_log(g);
3948
3949 #ifdef SUPPORT_TLS
3950 if (LOGGING(tls_cipher) && tls_in.cipher)
3951 g = string_append(g, 2, US" X=", tls_in.cipher);
3952 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3953 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3954 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3955 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3956 if (LOGGING(tls_sni) && tls_in.sni)
3957 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3958 #endif
3959
3960 if (sender_host_authenticated)
3961 {
3962 g = string_append(g, 2, US" A=", sender_host_authenticated);
3963 if (authenticated_id)
3964 {
3965 g = string_append(g, 2, US":", authenticated_id);
3966 if (LOGGING(smtp_mailauth) && authenticated_sender)
3967 g = string_append(g, 2, US":", authenticated_sender);
3968 }
3969 }
3970
3971 #ifndef DISABLE_PRDR
3972 if (prdr_requested)
3973 g = string_catn(g, US" PRDR", 5);
3974 #endif
3975
3976 #ifdef SUPPORT_PROXY
3977 if (proxy_session && LOGGING(proxy))
3978 g = string_append(g, 2, US" PRX=", proxy_local_address);
3979 #endif
3980
3981 if (chunking_state > CHUNKING_OFFERED)
3982 g = string_catn(g, US" K", 2);
3983
3984 sprintf(CS big_buffer, "%d", msg_size);
3985 g = string_append(g, 2, US" S=", big_buffer);
3986
3987 /* log 8BITMIME mode announced in MAIL_FROM
3988 0 ... no BODY= used
3989 7 ... 7BIT
3990 8 ... 8BITMIME */
3991 if (LOGGING(8bitmime))
3992 {
3993 sprintf(CS big_buffer, "%d", body_8bitmime);
3994 g = string_append(g, 2, US" M8S=", big_buffer);
3995 }
3996
3997 #ifndef DISABLE_DKIM
3998 if (LOGGING(dkim) && dkim_verify_overall)
3999 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4000 # ifdef EXPERIMENTAL_ARC
4001 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4002 g = string_catn(g, US" ARC", 4);
4003 # endif
4004 #endif
4005
4006 if (LOGGING(receive_time))
4007 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
4008
4009 if (*queue_name)
4010 g = string_append(g, 2, US" Q=", queue_name);
4011
4012 /* If an addr-spec in a message-id contains a quoted string, it can contain
4013 any characters except " \ and CR and so in particular it can contain NL!
4014 Therefore, make sure we use a printing-characters only version for the log.
4015 Also, allow for domain literals in the message id. */
4016
4017 if (msgid_header)
4018 {
4019 uschar *old_id;
4020 BOOL save_allow_domain_literals = allow_domain_literals;
4021 allow_domain_literals = TRUE;
4022 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4023 &errmsg, &start, &end, &domain, FALSE);
4024 allow_domain_literals = save_allow_domain_literals;
4025 if (old_id != NULL)
4026 g = string_append(g, 2, US" id=", string_printing(old_id));
4027 }
4028
4029 /* If subject logging is turned on, create suitable printing-character
4030 text. By expanding $h_subject: we make use of the MIME decoding. */
4031
4032 if (LOGGING(subject) && subject_header)
4033 {
4034 int i;
4035 uschar *p = big_buffer;
4036 uschar *ss = expand_string(US"$h_subject:");
4037
4038 /* Backslash-quote any double quotes or backslashes so as to make a
4039 a C-like string, and turn any non-printers into escape sequences. */
4040
4041 *p++ = '\"';
4042 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4043 {
4044 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4045 *p++ = ss[i];
4046 }
4047 *p++ = '\"';
4048 *p = 0;
4049 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4050 }
4051
4052 /* Terminate the string: string_cat() and string_append() leave room, but do
4053 not put the zero in. */
4054
4055 (void) string_from_gstring(g);
4056
4057 /* Create a message log file if message logs are being used and this message is
4058 not blackholed. Write the reception stuff to it. We used to leave message log
4059 creation until the first delivery, but this has proved confusing for some
4060 people. */
4061
4062 if (message_logs && !blackholed_by)
4063 {
4064 int fd;
4065 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4066
4067 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4068 && errno == ENOENT
4069 )
4070 {
4071 (void)directory_make(spool_directory,
4072 spool_sname(US"msglog", message_subdir),
4073 MSGLOG_DIRECTORY_MODE, TRUE);
4074 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4075 }
4076
4077 if (fd < 0)
4078 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4079 m_name, strerror(errno));
4080 else
4081 {
4082 FILE *message_log =