64f62757d78ffddf456fc20419a4657f78ad4b4d
[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 int data_fd = -1;
26 static uschar *spool_name = US"";
27
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
29
30 #ifdef HAVE_LOCAL_SCAN
31 jmp_buf local_scan_env; /* error-handling context for local_scan */
32 unsigned had_local_scan_crash;
33 unsigned had_local_scan_timeout;
34 #endif
35
36
37 /*************************************************
38 * Non-SMTP character reading functions *
39 *************************************************/
40
41 /* These are the default functions that are set up in the variables such as
42 receive_getc initially. They just call the standard functions, passing stdin as
43 the file. (When SMTP input is occurring, different functions are used by
44 changing the pointer variables.) */
45
46 int
47 stdin_getc(unsigned lim)
48 {
49 int c = getc(stdin);
50
51 if (had_data_timeout)
52 {
53 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
54 log_write(L_lost_incoming_connection,
55 LOG_MAIN, "timed out while reading local message");
56 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
57 }
58 if (had_data_sigint)
59 {
60 if (filter_test == FTEST_NONE)
61 {
62 fprintf(stderr, "\nexim: %s received - message abandoned\n",
63 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
64 log_write(0, LOG_MAIN, "%s received while reading local message",
65 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
66 }
67 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
68 }
69 return c;
70 }
71
72 int
73 stdin_ungetc(int c)
74 {
75 return ungetc(c, stdin);
76 }
77
78 int
79 stdin_feof(void)
80 {
81 return feof(stdin);
82 }
83
84 int
85 stdin_ferror(void)
86 {
87 return ferror(stdin);
88 }
89
90
91
92
93 /*************************************************
94 * Check that a set sender is allowed *
95 *************************************************/
96
97 /* This function is called when a local caller sets an explicit sender address.
98 It checks whether this is permitted, which it is for trusted callers.
99 Otherwise, it must match the pattern(s) in untrusted_set_sender.
100
101 Arguments: the proposed sender address
102 Returns: TRUE for a trusted caller
103 TRUE if the address has been set, untrusted_set_sender has been
104 set, and the address matches something in the list
105 FALSE otherwise
106 */
107
108 BOOL
109 receive_check_set_sender(uschar *newsender)
110 {
111 uschar *qnewsender;
112 if (f.trusted_caller) return TRUE;
113 if (!newsender || !untrusted_set_sender) return FALSE;
114 qnewsender = Ustrchr(newsender, '@')
115 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
116 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
117 }
118
119
120
121
122 /*************************************************
123 * Read space info for a partition *
124 *************************************************/
125
126 /* This function is called by receive_check_fs() below, and also by string
127 expansion for variables such as $spool_space. The field names for the statvfs
128 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
129 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
130 have inodes, and they return -1 for the number available.
131
132 Later: It turns out that some file systems that do not have the concept of
133 inodes return 0 rather than -1. Such systems should also return 0 for the total
134 number of inodes, so we require that to be greater than zero before returning
135 an inode count.
136
137 Arguments:
138 isspool TRUE for spool partition, FALSE for log partition
139 inodeptr address of int to receive inode count; -1 if there isn't one
140
141 Returns: available on-root space, in kilobytes
142 -1 for log partition if there isn't one
143
144 All values are -1 if the STATFS functions are not available.
145 */
146
147 int_eximarith_t
148 receive_statvfs(BOOL isspool, int *inodeptr)
149 {
150 #ifdef HAVE_STATFS
151 struct STATVFS statbuf;
152 struct stat dummy;
153 uschar *path;
154 uschar *name;
155 uschar buffer[1024];
156
157 /* The spool directory must always exist. */
158
159 if (isspool)
160 {
161 path = spool_directory;
162 name = US"spool";
163 }
164
165 /* Need to cut down the log file path to the directory, and to ignore any
166 appearance of "syslog" in it. */
167
168 else
169 {
170 int sep = ':'; /* Not variable - outside scripts use */
171 const uschar *p = log_file_path;
172 name = US"log";
173
174 /* An empty log_file_path means "use the default". This is the same as an
175 empty item in a list. */
176
177 if (*p == 0) p = US":";
178 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
179 if (Ustrcmp(path, "syslog") != 0)
180 break;
181
182 if (path == NULL) /* No log files */
183 {
184 *inodeptr = -1;
185 return -1;
186 }
187
188 /* An empty string means use the default, which is in the spool directory.
189 But don't just use the spool directory, as it is possible that the log
190 subdirectory has been symbolically linked elsewhere. */
191
192 if (path[0] == 0)
193 {
194 sprintf(CS buffer, CS"%s/log", CS spool_directory);
195 path = buffer;
196 }
197 else
198 {
199 uschar *cp;
200 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
201 }
202 }
203
204 /* We now have the path; do the business */
205
206 memset(&statbuf, 0, sizeof(statbuf));
207
208 if (STATVFS(CS path, &statbuf) != 0)
209 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
210 { /* Can happen on first run after installation */
211 *inodeptr = -1;
212 return -1;
213 }
214 else
215 {
216 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
217 "%s directory %s: %s", name, path, strerror(errno));
218 smtp_closedown(US"spool or log directory problem");
219 exim_exit(EXIT_FAILURE, NULL);
220 }
221
222 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
223
224 /* Disks are getting huge. Take care with computing the size in kilobytes. */
225
226 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
227
228 #else
229 /* Unable to find partition sizes in this environment. */
230
231 *inodeptr = -1;
232 return -1;
233 #endif
234 }
235
236
237
238
239 /*************************************************
240 * Check space on spool and log partitions *
241 *************************************************/
242
243 /* This function is called before accepting a message; if any thresholds are
244 set, it checks them. If a message_size is supplied, it checks that there is
245 enough space for that size plus the threshold - i.e. that the message won't
246 reduce the space to the threshold. Not all OS have statvfs(); for those that
247 don't, this function always returns TRUE. For some OS the old function and
248 struct name statfs is used; that is handled by a macro, defined in exim.h.
249
250 Arguments:
251 msg_size the (estimated) size of an incoming message
252
253 Returns: FALSE if there isn't enough space, or if the information cannot
254 be obtained
255 TRUE if no check was done or there is enough space
256 */
257
258 BOOL
259 receive_check_fs(int msg_size)
260 {
261 int_eximarith_t space;
262 int 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 = " PR_EXIM_ARITH "K inodes = %d "
270 "check_space = " PR_EXIM_ARITH "K 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="
277 PR_EXIM_ARITH " 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 = " PR_EXIM_ARITH "K inodes = %d "
288 "check_space = " PR_EXIM_ARITH "K 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=" PR_EXIM_ARITH
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 (spool_data_file)
347 {
348 (void)fclose(spool_data_file);
349 spool_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 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
558 recipient);
559 for (int count = 0; count < recipients_count; count++)
560 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
561 {
562 if ((--recipients_count - count) > 0)
563 memmove(recipients_list + count, recipients_list + count + 1,
564 (recipients_count - count)*sizeof(recipient_item));
565 return TRUE;
566 }
567 return FALSE;
568 }
569
570
571
572
573
574 /* Pause for a while waiting for input. If none received in that time,
575 close the logfile, if we had one open; then if we wait for a long-running
576 datasource (months, in one use-case) log rotation will not leave us holding
577 the file copy. */
578
579 static void
580 log_close_chk(void)
581 {
582 if (!receive_timeout)
583 {
584 struct timeval t;
585 timesince(&t, &received_time);
586 if (t.tv_sec > 30*60)
587 mainlog_close();
588 else
589 {
590 fd_set r;
591 FD_ZERO(&r); FD_SET(0, &r);
592 t.tv_sec = 30*60 - t.tv_sec; t.tv_usec = 0;
593 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
594 }
595 }
596 }
597
598 /*************************************************
599 * Read data portion of a non-SMTP message *
600 *************************************************/
601
602 /* This function is called to read the remainder of a message (following the
603 header) when the input is not from SMTP - we are receiving a local message on
604 a standard input stream. The message is always terminated by EOF, and is also
605 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
606 two cases for maximum efficiency.
607
608 Ensure that the body ends with a newline. This will naturally be the case when
609 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
610 as "sequences of lines" - this of course strictly applies only to SMTP, but
611 deliveries into BSD-type mailbox files also require it. Exim used to have a
612 flag for doing this at delivery time, but as it was always set for all
613 transports, I decided to simplify things by putting the check here instead.
614
615 There is at least one MUA (dtmail) that sends CRLF via this interface, and
616 other programs are known to do this as well. Exim used to have a option for
617 dealing with this: in July 2003, after much discussion, the code has been
618 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
619
620 However, for the case when a dot on a line by itself terminates a message, the
621 only recognized terminating sequences before and after the dot are LF and CRLF.
622 Otherwise, having read EOL . CR, you don't know whether to read another
623 character or not.
624
625 Internally, in messages stored in Exim's spool files, LF is used as the line
626 terminator. Under the new regime, bare CRs will no longer appear in these
627 files.
628
629 Arguments:
630 fout a FILE to which to write the message
631
632 Returns: One of the END_xxx values indicating why it stopped reading
633 */
634
635 static int
636 read_message_data(FILE *fout)
637 {
638 int ch_state;
639 register int ch;
640 register int linelength = 0;
641
642 /* Handle the case when only EOF terminates the message */
643
644 if (!f.dot_ends)
645 {
646 int last_ch = '\n';
647
648 for ( ;
649 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
650 last_ch = ch)
651 {
652 if (ch == 0) body_zerocount++;
653 if (last_ch == '\r' && ch != '\n')
654 {
655 if (linelength > max_received_linelength)
656 max_received_linelength = linelength;
657 linelength = 0;
658 if (fputc('\n', fout) == EOF) return END_WERROR;
659 message_size++;
660 body_linecount++;
661 }
662 if (ch == '\r') continue;
663
664 if (fputc(ch, fout) == EOF) return END_WERROR;
665 if (ch == '\n')
666 {
667 if (linelength > max_received_linelength)
668 max_received_linelength = linelength;
669 linelength = 0;
670 body_linecount++;
671 }
672 else linelength++;
673 if (++message_size > thismessage_size_limit) return END_SIZE;
674 }
675
676 if (last_ch != '\n')
677 {
678 if (linelength > max_received_linelength)
679 max_received_linelength = linelength;
680 if (fputc('\n', fout) == EOF) return END_WERROR;
681 message_size++;
682 body_linecount++;
683 }
684
685 return END_EOF;
686 }
687
688 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
689
690 ch_state = 1;
691
692 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
693 {
694 if (ch == 0) body_zerocount++;
695 switch (ch_state)
696 {
697 case 0: /* Normal state (previous char written) */
698 if (ch == '\n')
699 {
700 body_linecount++;
701 if (linelength > max_received_linelength)
702 max_received_linelength = linelength;
703 linelength = -1;
704 ch_state = 1;
705 }
706 else if (ch == '\r')
707 { ch_state = 2; continue; }
708 break;
709
710 case 1: /* After written "\n" */
711 if (ch == '.') { ch_state = 3; continue; }
712 if (ch == '\r') { ch_state = 2; continue; }
713 if (ch == '\n') { body_linecount++; linelength = -1; }
714 else ch_state = 0;
715 break;
716
717 case 2:
718 body_linecount++; /* After unwritten "\r" */
719 if (linelength > max_received_linelength)
720 max_received_linelength = linelength;
721 if (ch == '\n')
722 {
723 ch_state = 1;
724 linelength = -1;
725 }
726 else
727 {
728 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
729 if (ch == '\r') continue;
730 ch_state = 0;
731 linelength = 0;
732 }
733 break;
734
735 case 3: /* After "\n." (\n written, dot not) */
736 if (ch == '\n') return END_DOT;
737 if (ch == '\r') { ch_state = 4; continue; }
738 message_size++;
739 linelength++;
740 if (fputc('.', fout) == EOF) return END_WERROR;
741 ch_state = 0;
742 break;
743
744 case 4: /* After "\n.\r" (\n written, rest not) */
745 if (ch == '\n') return END_DOT;
746 message_size += 2;
747 body_linecount++;
748 if (fputs(".\n", fout) == EOF) return END_WERROR;
749 if (ch == '\r') { ch_state = 2; continue; }
750 ch_state = 0;
751 break;
752 }
753
754 linelength++;
755 if (fputc(ch, fout) == EOF) return END_WERROR;
756 if (++message_size > thismessage_size_limit) return END_SIZE;
757 }
758
759 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
760 the message ends with a newline, and we must also write any characters that
761 were saved up while testing for an ending dot. */
762
763 if (ch_state != 1)
764 {
765 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
766 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
767 message_size += Ustrlen(ends[ch_state]);
768 body_linecount++;
769 }
770
771 return END_EOF;
772 }
773
774
775
776
777 /*************************************************
778 * Read data portion of an SMTP message *
779 *************************************************/
780
781 /* This function is called to read the remainder of an SMTP message (after the
782 headers), or to skip over it when an error has occurred. In this case, the
783 output file is passed as NULL.
784
785 If any line begins with a dot, that character is skipped. The input should only
786 be successfully terminated by CR LF . CR LF unless it is local (non-network)
787 SMTP, in which case the CRs are optional, but...
788
789 FUDGE: It seems that sites on the net send out messages with just LF
790 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
791 we make the CRs optional in all cases.
792
793 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
794 well, so that there are no CRs in spooled messages. However, the message
795 terminating dot is not recognized between two bare CRs.
796
797 Arguments:
798 fout a FILE to which to write the message; NULL if skipping
799
800 Returns: One of the END_xxx values indicating why it stopped reading
801 */
802
803 static int
804 read_message_data_smtp(FILE *fout)
805 {
806 int ch_state = 0;
807 int ch;
808 int linelength = 0;
809
810 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
811 {
812 if (ch == 0) body_zerocount++;
813 switch (ch_state)
814 {
815 case 0: /* After LF or CRLF */
816 if (ch == '.')
817 {
818 ch_state = 3;
819 continue; /* Don't ever write . after LF */
820 }
821 ch_state = 1;
822
823 /* Else fall through to handle as normal uschar. */
824
825 case 1: /* Normal state */
826 if (ch == '\n')
827 {
828 ch_state = 0;
829 body_linecount++;
830 if (linelength > max_received_linelength)
831 max_received_linelength = linelength;
832 linelength = -1;
833 }
834 else if (ch == '\r')
835 {
836 ch_state = 2;
837 continue;
838 }
839 break;
840
841 case 2: /* After (unwritten) CR */
842 body_linecount++;
843 if (linelength > max_received_linelength)
844 max_received_linelength = linelength;
845 linelength = -1;
846 if (ch == '\n')
847 {
848 ch_state = 0;
849 }
850 else
851 {
852 message_size++;
853 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
854 cutthrough_data_put_nl();
855 if (ch != '\r') ch_state = 1; else continue;
856 }
857 break;
858
859 case 3: /* After [CR] LF . */
860 if (ch == '\n')
861 return END_DOT;
862 if (ch == '\r')
863 {
864 ch_state = 4;
865 continue;
866 }
867 /* The dot was removed at state 3. For a doubled dot, here, reinstate
868 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
869 and to file below. */
870 if (ch == '.')
871 {
872 uschar c= ch;
873 cutthrough_data_puts(&c, 1);
874 }
875 ch_state = 1;
876 break;
877
878 case 4: /* After [CR] LF . CR */
879 if (ch == '\n') return END_DOT;
880 message_size++;
881 body_linecount++;
882 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
883 cutthrough_data_put_nl();
884 if (ch == '\r')
885 {
886 ch_state = 2;
887 continue;
888 }
889 ch_state = 1;
890 break;
891 }
892
893 /* Add the character to the spool file, unless skipping; then loop for the
894 next. */
895
896 message_size++;
897 linelength++;
898 if (fout)
899 {
900 if (fputc(ch, fout) == EOF) return END_WERROR;
901 if (message_size > thismessage_size_limit) return END_SIZE;
902 }
903 if(ch == '\n')
904 cutthrough_data_put_nl();
905 else
906 {
907 uschar c = ch;
908 cutthrough_data_puts(&c, 1);
909 }
910 }
911
912 /* Fall through here if EOF encountered. This indicates some kind of error,
913 since a correct message is terminated by [CR] LF . [CR] LF. */
914
915 return END_EOF;
916 }
917
918
919
920
921 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
922 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
923 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
924 body_linecount accounting for proper re-expansion for the wire, so use
925 a cut-down version of the state-machine above; we don't need to do leading-dot
926 detection and unstuffing.
927
928 Arguments:
929 fout a FILE to which to write the message; NULL if skipping;
930 must be open for both writing and reading.
931
932 Returns: One of the END_xxx values indicating why it stopped reading
933 */
934
935 static int
936 read_message_bdat_smtp(FILE *fout)
937 {
938 int linelength = 0, ch;
939 enum CH_STATE ch_state = LF_SEEN;
940 BOOL fix_nl = FALSE;
941
942 for(;;)
943 {
944 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
945 {
946 case EOF: return END_EOF;
947 case ERR: return END_PROTOCOL;
948 case EOD:
949 /* Nothing to get from the sender anymore. We check the last
950 character written to the spool.
951
952 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
953 If we would be strict, we would refuse such broken messages.
954 But we are liberal, so we fix it. It would be easy just to append
955 the "\n" to the spool.
956
957 But there are some more things (line counting, message size calculation and such),
958 that would need to be duplicated here. So we simply do some ungetc
959 trickery.
960 */
961 if (fout)
962 {
963 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
964 if (fgetc(fout) == '\n') return END_DOT;
965 }
966
967 if (linelength == -1) /* \r already seen (see below) */
968 {
969 DEBUG(D_receive) debug_printf("Add missing LF\n");
970 bdat_ungetc('\n');
971 continue;
972 }
973 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
974 bdat_ungetc('\r'); /* not even \r was seen */
975 fix_nl = TRUE;
976
977 continue;
978 case '\0': body_zerocount++; break;
979 }
980 switch (ch_state)
981 {
982 case LF_SEEN: /* After LF or CRLF */
983 ch_state = MID_LINE;
984 /* fall through to handle as normal uschar. */
985
986 case MID_LINE: /* Mid-line state */
987 if (ch == '\n')
988 {
989 ch_state = LF_SEEN;
990 body_linecount++;
991 if (linelength > max_received_linelength)
992 max_received_linelength = linelength;
993 linelength = -1;
994 }
995 else if (ch == '\r')
996 {
997 ch_state = CR_SEEN;
998 if (fix_nl) bdat_ungetc('\n');
999 continue; /* don't write CR */
1000 }
1001 break;
1002
1003 case CR_SEEN: /* After (unwritten) CR */
1004 body_linecount++;
1005 if (linelength > max_received_linelength)
1006 max_received_linelength = linelength;
1007 linelength = -1;
1008 if (ch == '\n')
1009 ch_state = LF_SEEN;
1010 else
1011 {
1012 message_size++;
1013 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1014 cutthrough_data_put_nl();
1015 if (ch == '\r') continue; /* don't write CR */
1016 ch_state = MID_LINE;
1017 }
1018 break;
1019 }
1020
1021 /* Add the character to the spool file, unless skipping */
1022
1023 message_size++;
1024 linelength++;
1025 if (fout)
1026 {
1027 if (fputc(ch, fout) == EOF) return END_WERROR;
1028 if (message_size > thismessage_size_limit) return END_SIZE;
1029 }
1030 if(ch == '\n')
1031 cutthrough_data_put_nl();
1032 else
1033 {
1034 uschar c = ch;
1035 cutthrough_data_puts(&c, 1);
1036 }
1037 }
1038 /*NOTREACHED*/
1039 }
1040
1041 static int
1042 read_message_bdat_smtp_wire(FILE *fout)
1043 {
1044 int ch;
1045
1046 /* Remember that this message uses wireformat. */
1047
1048 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1049 fout ? "writing spoolfile in wire format" : "flushing input");
1050 f.spool_file_wireformat = TRUE;
1051
1052 for (;;)
1053 {
1054 if (chunking_data_left > 0)
1055 {
1056 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1057 uschar * buf = bdat_getbuf(&len);
1058
1059 if (!buf) return END_EOF;
1060 message_size += len;
1061 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1062 }
1063 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1064 {
1065 case EOF: return END_EOF;
1066 case EOD: return END_DOT;
1067 case ERR: return END_PROTOCOL;
1068
1069 default:
1070 message_size++;
1071 /*XXX not done:
1072 linelength
1073 max_received_linelength
1074 body_linecount
1075 body_zerocount
1076 */
1077 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1078 break;
1079 }
1080 if (message_size > thismessage_size_limit) return END_SIZE;
1081 }
1082 /*NOTREACHED*/
1083 }
1084
1085
1086
1087
1088 /*************************************************
1089 * Swallow SMTP message *
1090 *************************************************/
1091
1092 /* This function is called when there has been some kind of error while reading
1093 an SMTP message, and the remaining data may need to be swallowed. It is global
1094 because it is called from smtp_closedown() to shut down an incoming call
1095 tidily.
1096
1097 Argument: a FILE from which to read the message
1098 Returns: nothing
1099 */
1100
1101 void
1102 receive_swallow_smtp(void)
1103 {
1104 if (message_ended >= END_NOTENDED)
1105 message_ended = chunking_state <= CHUNKING_OFFERED
1106 ? read_message_data_smtp(NULL)
1107 : read_message_bdat_smtp_wire(NULL);
1108 }
1109
1110
1111
1112 /*************************************************
1113 * Handle lost SMTP connection *
1114 *************************************************/
1115
1116 /* This function logs connection loss incidents and generates an appropriate
1117 SMTP response.
1118
1119 Argument: additional data for the message
1120 Returns: the SMTP response
1121 */
1122
1123 static uschar *
1124 handle_lost_connection(uschar *s)
1125 {
1126 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1127 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1128 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1129 return US"421 Lost incoming connection";
1130 }
1131
1132
1133
1134
1135 /*************************************************
1136 * Handle a non-smtp reception error *
1137 *************************************************/
1138
1139 /* This function is called for various errors during the reception of non-SMTP
1140 messages. It either sends a message to the sender of the problem message, or it
1141 writes to the standard error stream.
1142
1143 Arguments:
1144 errcode code for moan_to_sender(), identifying the error
1145 text1 first message text, passed to moan_to_sender()
1146 text2 second message text, used only for stderrr
1147 error_rc code to pass to exim_exit if no problem
1148 f FILE containing body of message (may be stdin)
1149 hptr pointer to instore headers or NULL
1150
1151 Returns: calls exim_exit(), which does not return
1152 */
1153
1154 static void
1155 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1156 FILE *f, header_line *hptr)
1157 {
1158 if (error_handling == ERRORS_SENDER)
1159 {
1160 error_block eblock;
1161 eblock.next = NULL;
1162 eblock.text1 = text1;
1163 eblock.text2 = US"";
1164 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1165 error_rc = EXIT_FAILURE;
1166 }
1167 else
1168 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1169 (void)fclose(f);
1170 exim_exit(error_rc, US"");
1171 }
1172
1173
1174
1175 /*************************************************
1176 * Add header lines set up by ACL *
1177 *************************************************/
1178
1179 /* This function is called to add the header lines that were set up by
1180 statements in an ACL to the list of headers in memory. It is done in two stages
1181 like this, because when the ACL for RCPT is running, the other headers have not
1182 yet been received. This function is called twice; once just before running the
1183 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1184 are visible to the DATA ACL.
1185
1186 Originally these header lines were added at the end. Now there is support for
1187 three different places: top, bottom, and after the Received: header(s). There
1188 will always be at least one Received: header, even if it is marked deleted, and
1189 even if something else has been put in front of it.
1190
1191 Arguments:
1192 acl_name text to identify which ACL
1193
1194 Returns: nothing
1195 */
1196
1197 static void
1198 add_acl_headers(int where, uschar *acl_name)
1199 {
1200 header_line *last_received = NULL;
1201
1202 switch(where)
1203 {
1204 case ACL_WHERE_DKIM:
1205 case ACL_WHERE_MIME:
1206 case ACL_WHERE_DATA:
1207 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1208 && (acl_removed_headers || acl_added_headers))
1209 {
1210 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1211 " will not take effect on cutthrough deliveries");
1212 return;
1213 }
1214 }
1215
1216 if (acl_removed_headers)
1217 {
1218 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1219
1220 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1221 {
1222 const uschar * list = acl_removed_headers;
1223 int sep = ':'; /* This is specified as a colon-separated list */
1224 uschar *s;
1225 uschar buffer[128];
1226
1227 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1228 if (header_testname(h, s, Ustrlen(s), FALSE))
1229 {
1230 h->type = htype_old;
1231 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1232 }
1233 }
1234 acl_removed_headers = NULL;
1235 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1236 }
1237
1238 if (!acl_added_headers) return;
1239 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1240
1241 for (header_line * h = acl_added_headers, * next; h; h = next)
1242 {
1243 next = h->next;
1244
1245 switch(h->type)
1246 {
1247 case htype_add_top:
1248 h->next = header_list;
1249 header_list = h;
1250 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1251 break;
1252
1253 case htype_add_rec:
1254 if (!last_received)
1255 {
1256 last_received = header_list;
1257 while (!header_testname(last_received, US"Received", 8, FALSE))
1258 last_received = last_received->next;
1259 while (last_received->next &&
1260 header_testname(last_received->next, US"Received", 8, FALSE))
1261 last_received = last_received->next;
1262 }
1263 h->next = last_received->next;
1264 last_received->next = h;
1265 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1266 break;
1267
1268 case htype_add_rfc:
1269 /* add header before any header which is NOT Received: or Resent- */
1270 last_received = header_list;
1271 while ( last_received->next &&
1272 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1273 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1274 last_received = last_received->next;
1275 /* last_received now points to the last Received: or Resent-* header
1276 in an uninterrupted chain of those header types (seen from the beginning
1277 of all headers. Our current header must follow it. */
1278 h->next = last_received->next;
1279 last_received->next = h;
1280 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1281 break;
1282
1283 default:
1284 h->next = NULL;
1285 header_last->next = h;
1286 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1287 break;
1288 }
1289
1290 if (!h->next) header_last = h;
1291
1292 /* Check for one of the known header types (From:, To:, etc.) though in
1293 practice most added headers are going to be "other". Lower case
1294 identification letters are never stored with the header; they are used
1295 for existence tests when messages are received. So discard any lower case
1296 flag values. */
1297
1298 h->type = header_checkname(h, FALSE);
1299 if (h->type >= 'a') h->type = htype_other;
1300
1301 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1302 }
1303
1304 acl_added_headers = NULL;
1305 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1306 }
1307
1308
1309
1310 /*************************************************
1311 * Add host information for log line *
1312 *************************************************/
1313
1314 /* Called for acceptance and rejecting log lines. This adds information about
1315 the calling host to a string that is being built dynamically.
1316
1317 Arguments:
1318 s the dynamic string
1319
1320 Returns: the extended string
1321 */
1322
1323 static gstring *
1324 add_host_info_for_log(gstring * g)
1325 {
1326 if (sender_fullhost)
1327 {
1328 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1329 g = string_catn(g, US" DS", 3);
1330 g = string_append(g, 2, US" H=", sender_fullhost);
1331 if (LOGGING(incoming_interface) && interface_address)
1332 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1333 }
1334 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1335 {
1336 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1337 f.tcp_in_fastopen_logged = TRUE;
1338 }
1339 if (sender_ident)
1340 g = string_append(g, 2, US" U=", sender_ident);
1341 if (received_protocol)
1342 g = string_append(g, 2, US" P=", received_protocol);
1343 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1344 {
1345 g = string_catn(g, US" L", 2);
1346 #ifdef EXPERIMENTAL_PIPE_CONNECT
1347 if (f.smtp_in_early_pipe_used)
1348 g = string_catn(g, US"*", 1);
1349 else if (f.smtp_in_early_pipe_advertised)
1350 g = string_catn(g, US".", 1);
1351 #endif
1352 if (!f.smtp_in_pipelining_used)
1353 g = string_catn(g, US"-", 1);
1354 }
1355 return g;
1356 }
1357
1358
1359
1360 #ifdef WITH_CONTENT_SCAN
1361
1362 /*************************************************
1363 * Run the MIME ACL on a message *
1364 *************************************************/
1365
1366 /* This code is in a subroutine so that it can be used for both SMTP
1367 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1368
1369 Arguments:
1370 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1371 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1372 smtp_reply_ptr Where SMTP reply is being built
1373 blackholed_by_ptr Where "blackholed by" message is being built
1374
1375 Returns: TRUE to carry on; FALSE to abandon the message
1376 */
1377
1378 static BOOL
1379 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1380 uschar **blackholed_by_ptr)
1381 {
1382 FILE *mbox_file;
1383 uschar * rfc822_file_path = NULL;
1384 unsigned long mbox_size;
1385 uschar *user_msg, *log_msg;
1386 int mime_part_count_buffer = -1;
1387 uschar * mbox_filename;
1388 int rc = OK;
1389
1390 /* check if it is a MIME message */
1391
1392 for (header_line * my_headerlist = header_list; my_headerlist;
1393 my_headerlist = my_headerlist->next)
1394 if ( my_headerlist->type != '*' /* skip deleted headers */
1395 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1396 )
1397 {
1398 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1399 goto DO_MIME_ACL;
1400 }
1401
1402 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1403 return TRUE;
1404
1405 DO_MIME_ACL:
1406
1407 /* make sure the eml mbox file is spooled up */
1408 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1409 { /* error while spooling */
1410 log_write(0, LOG_MAIN|LOG_PANIC,
1411 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1412 Uunlink(spool_name);
1413 unspool_mbox();
1414 #ifdef EXPERIMENTAL_DCC
1415 dcc_ok = 0;
1416 #endif
1417 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1418 message_id[0] = 0; /* Indicate no message accepted */
1419 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1420 return FALSE; /* Indicate skip to end of receive function */
1421 }
1422
1423 mime_is_rfc822 = 0;
1424
1425 MIME_ACL_CHECK:
1426 mime_part_count = -1;
1427 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1428 (void)fclose(mbox_file);
1429
1430 if (rfc822_file_path)
1431 {
1432 mime_part_count = mime_part_count_buffer;
1433
1434 if (unlink(CS rfc822_file_path) == -1)
1435 {
1436 log_write(0, LOG_PANIC,
1437 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1438 goto END_MIME_ACL;
1439 }
1440 rfc822_file_path = NULL;
1441 }
1442
1443 /* check if we must check any message/rfc822 attachments */
1444 if (rc == OK)
1445 {
1446 uschar * scandir = string_copyn(mbox_filename,
1447 Ustrrchr(mbox_filename, '/') - mbox_filename);
1448 struct dirent * entry;
1449 DIR * tempdir;
1450
1451 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1452 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1453 {
1454 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1455 DEBUG(D_receive)
1456 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1457 rfc822_file_path);
1458 break;
1459 }
1460 closedir(tempdir);
1461
1462 if (rfc822_file_path)
1463 {
1464 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1465 {
1466 /* set RFC822 expansion variable */
1467 mime_is_rfc822 = 1;
1468 mime_part_count_buffer = mime_part_count;
1469 goto MIME_ACL_CHECK;
1470 }
1471 log_write(0, LOG_PANIC,
1472 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1473 unlink(CS rfc822_file_path);
1474 }
1475 }
1476
1477 END_MIME_ACL:
1478 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1479 if (rc == DISCARD)
1480 {
1481 recipients_count = 0;
1482 *blackholed_by_ptr = US"MIME ACL";
1483 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1484 }
1485 else if (rc != OK)
1486 {
1487 Uunlink(spool_name);
1488 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1489 unspool_mbox();
1490 #ifdef EXPERIMENTAL_DCC
1491 dcc_ok = 0;
1492 #endif
1493 if (smtp_input)
1494 {
1495 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1496 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1497 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1498 }
1499 message_id[0] = 0; /* Indicate no message accepted */
1500 return FALSE; /* Cause skip to end of receive function */
1501 }
1502
1503 return TRUE;
1504 }
1505
1506 #endif /* WITH_CONTENT_SCAN */
1507
1508
1509
1510 void
1511 received_header_gen(void)
1512 {
1513 uschar *received;
1514 uschar *timestamp;
1515 header_line *received_header= header_list;
1516
1517 timestamp = expand_string(US"${tod_full}");
1518 if (recipients_count == 1) received_for = recipients_list[0].address;
1519 received = expand_string(received_header_text);
1520 received_for = NULL;
1521
1522 if (!received)
1523 {
1524 if(spool_name[0] != 0)
1525 Uunlink(spool_name); /* Lose the data file */
1526 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1527 "(received_header_text) failed: %s", string_printing(received_header_text),
1528 expand_string_message);
1529 }
1530
1531 /* The first element on the header chain is reserved for the Received header,
1532 so all we have to do is fill in the text pointer, and set the type. However, if
1533 the result of the expansion is an empty string, we leave the header marked as
1534 "old" so as to refrain from adding a Received header. */
1535
1536 if (received[0] == 0)
1537 {
1538 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1539 received_header->type = htype_old;
1540 }
1541 else
1542 {
1543 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1544 received_header->type = htype_received;
1545 }
1546
1547 received_header->slen = Ustrlen(received_header->text);
1548
1549 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1550 received_header->type, received_header->text);
1551 }
1552
1553
1554
1555 /*************************************************
1556 * Receive message *
1557 *************************************************/
1558
1559 /* Receive a message on the given input, and put it into a pair of spool files.
1560 Either a non-null list of recipients, or the extract flag will be true, or
1561 both. The flag sender_local is true for locally generated messages. The flag
1562 submission_mode is true if an ACL has obeyed "control = submission". The flag
1563 suppress_local_fixups is true if an ACL has obeyed "control =
1564 suppress_local_fixups" or -G was passed on the command-line.
1565 The flag smtp_input is true if the message is to be
1566 handled using SMTP conventions about termination and lines starting with dots.
1567 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1568
1569 If a message was successfully read, message_id[0] will be non-zero.
1570
1571 The general actions of this function are:
1572
1573 . Read the headers of the message (if any) into a chain of store
1574 blocks.
1575
1576 . If there is a "sender:" header and the message is locally originated,
1577 throw it away, unless the caller is trusted, or unless
1578 active_local_sender_retain is set - which can only happen if
1579 active_local_from_check is false.
1580
1581 . If recipients are to be extracted from the message, build the
1582 recipients list from the headers, removing any that were on the
1583 original recipients list (unless extract_addresses_remove_arguments is
1584 false), and at the same time, remove any bcc header that may be present.
1585
1586 . Get the spool file for the data, sort out its unique name, open
1587 and lock it (but don't give it the name yet).
1588
1589 . Generate a "Message-Id" header if the message doesn't have one, for
1590 locally-originated messages.
1591
1592 . Generate a "Received" header.
1593
1594 . Ensure the recipients list is fully qualified and rewritten if necessary.
1595
1596 . If there are any rewriting rules, apply them to the sender address
1597 and also to the headers.
1598
1599 . If there is no from: header, generate one, for locally-generated messages
1600 and messages in "submission mode" only.
1601
1602 . If the sender is local, check that from: is correct, and if not, generate
1603 a Sender: header, unless message comes from a trusted caller, or this
1604 feature is disabled by active_local_from_check being false.
1605
1606 . If there is no "date" header, generate one, for locally-originated
1607 or submission mode messages only.
1608
1609 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1610 dot_ends mode, to the data file. Leave it open, to hold the lock.
1611
1612 . Write the envelope and the headers to a new file.
1613
1614 . Set the name for the header file; close it.
1615
1616 . Set the name for the data file; close it.
1617
1618 Because this function can potentially be called many times in a single
1619 SMTP connection, all store should be got by store_get(), so that it will be
1620 automatically retrieved after the message is accepted.
1621
1622 FUDGE: It seems that sites on the net send out messages with just LF
1623 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1624 we make the CRs optional in all cases.
1625
1626 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1627 new regime is now in place in which bare CRs in header lines are turned into LF
1628 followed by a space, so as not to terminate the header line.
1629
1630 February 2004: A bare LF in a header line in a message whose first line was
1631 terminated by CRLF is treated in the same way as a bare CR.
1632
1633 Arguments:
1634 extract_recip TRUE if recipients are to be extracted from the message's
1635 headers
1636
1637 Returns: TRUE there are more messages to be read (SMTP input)
1638 FALSE there are no more messages to be read (non-SMTP input
1639 or SMTP connection collapsed, or other failure)
1640
1641 When reading a message for filter testing, the returned value indicates
1642 whether the headers (which is all that is read) were terminated by '.' or
1643 not. */
1644
1645 BOOL
1646 receive_msg(BOOL extract_recip)
1647 {
1648 int rc = FAIL;
1649 int msg_size = 0;
1650 int process_info_len = Ustrlen(process_info);
1651 int error_rc = error_handling == ERRORS_SENDER
1652 ? errors_sender_rc : EXIT_FAILURE;
1653 int header_size = 256;
1654 int start, end, domain;
1655 int id_resolution = 0;
1656 int had_zero = 0;
1657 int prevlines_length = 0;
1658
1659 int ptr = 0;
1660
1661 BOOL contains_resent_headers = FALSE;
1662 BOOL extracted_ignored = FALSE;
1663 BOOL first_line_ended_crlf = TRUE_UNSET;
1664 BOOL smtp_yield = TRUE;
1665 BOOL yield = FALSE;
1666
1667 BOOL resents_exist = FALSE;
1668 uschar *resent_prefix = US"";
1669 uschar *blackholed_by = NULL;
1670 uschar *blackhole_log_msg = US"";
1671 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1672
1673 flock_t lock_data;
1674 error_block *bad_addresses = NULL;
1675
1676 uschar *frozen_by = NULL;
1677 uschar *queued_by = NULL;
1678
1679 uschar *errmsg;
1680 gstring * g;
1681 struct stat statbuf;
1682
1683 /* Final message to give to SMTP caller, and messages from ACLs */
1684
1685 uschar *smtp_reply = NULL;
1686 uschar *user_msg, *log_msg;
1687
1688 /* Working header pointers */
1689
1690 header_line *next;
1691
1692 /* Flags for noting the existence of certain headers (only one left) */
1693
1694 BOOL date_header_exists = FALSE;
1695
1696 /* Pointers to receive the addresses of headers whose contents we need. */
1697
1698 header_line *from_header = NULL;
1699 header_line *subject_header = NULL;
1700 header_line *msgid_header = NULL;
1701 header_line *received_header;
1702 BOOL msgid_header_newly_created = FALSE;
1703
1704 #ifdef EXPERIMENTAL_DMARC
1705 int dmarc_up = 0;
1706 #endif /* EXPERIMENTAL_DMARC */
1707
1708 /* Variables for use when building the Received: header. */
1709
1710 uschar *timestamp;
1711 int tslen;
1712
1713
1714 /* Release any open files that might have been cached while preparing to
1715 accept the message - e.g. by verifying addresses - because reading a message
1716 might take a fair bit of real time. */
1717
1718 search_tidyup();
1719
1720 /* Extracting the recipient list from an input file is incompatible with
1721 cutthrough delivery with the no-spool option. It shouldn't be possible
1722 to set up the combination, but just in case kill any ongoing connection. */
1723 if (extract_recip || !smtp_input)
1724 cancel_cutthrough_connection(TRUE, US"not smtp input");
1725
1726 /* Initialize the chain of headers by setting up a place-holder for Received:
1727 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1728 pointing to the end of the chain to make adding headers simple. */
1729
1730 received_header = header_list = header_last = store_get(sizeof(header_line));
1731 header_list->next = NULL;
1732 header_list->type = htype_old;
1733 header_list->text = NULL;
1734 header_list->slen = 0;
1735
1736 /* Control block for the next header to be read. */
1737
1738 next = store_get(sizeof(header_line));
1739 next->text = store_get(header_size);
1740
1741 /* Initialize message id to be null (indicating no message read), and the
1742 header names list to be the normal list. Indicate there is no data file open
1743 yet, initialize the size and warning count, and deal with no size limit. */
1744
1745 message_id[0] = 0;
1746 spool_data_file = NULL;
1747 data_fd = -1;
1748 spool_name = US"";
1749 message_size = 0;
1750 warning_count = 0;
1751 received_count = 1; /* For the one we will add */
1752
1753 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1754
1755 /* While reading the message, the following counts are computed. */
1756
1757 message_linecount = body_linecount = body_zerocount =
1758 max_received_linelength = 0;
1759
1760 #ifndef DISABLE_DKIM
1761 /* Call into DKIM to set up the context. In CHUNKING mode
1762 we clear the dot-stuffing flag */
1763 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1764 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1765 #endif
1766
1767 #ifdef EXPERIMENTAL_DMARC
1768 /* initialize libopendmarc */
1769 dmarc_up = dmarc_init();
1770 #endif
1771
1772 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1773 ids, and fractions of a second are required. See the comments that precede the
1774 message id creation below. */
1775
1776 (void)gettimeofday(&message_id_tv, NULL);
1777
1778 /* For other uses of the received time we can operate with granularity of one
1779 second, and for that we use the global variable received_time. This is for
1780 things like ultimate message timeouts. */
1781
1782 received_time = message_id_tv;
1783
1784 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1785 happen in the smtp_getc() function when it refills its buffer. */
1786
1787 had_data_timeout = 0;
1788 if (smtp_input)
1789 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1790
1791 /* If not SMTP input, timeout happens only if configured, and we just set a
1792 single timeout for the whole message. */
1793
1794 else if (receive_timeout > 0)
1795 {
1796 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1797 ALARM(receive_timeout);
1798 }
1799
1800 /* SIGTERM and SIGINT are caught always. */
1801
1802 had_data_sigint = 0;
1803 signal(SIGTERM, data_sigterm_sigint_handler);
1804 signal(SIGINT, data_sigterm_sigint_handler);
1805
1806 /* Header lines in messages are not supposed to be very long, though when
1807 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1808 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1809 storing the header, and extend this as necessary using string_cat().
1810
1811 To cope with total lunacies, impose an upper limit on the length of the header
1812 section of the message, as otherwise the store will fill up. We must also cope
1813 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1814 Folded header lines are joined into one string, leaving the '\n' characters
1815 inside them, so that writing them out reproduces the input.
1816
1817 Loop for each character of each header; the next structure for chaining the
1818 header is set up already, with ptr the offset of the next character in
1819 next->text. */
1820
1821 for (;;)
1822 {
1823 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1824
1825 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1826 SMTP must have a correct "." terminator. */
1827
1828 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1829 {
1830 smtp_reply = handle_lost_connection(US" (header)");
1831 smtp_yield = FALSE;
1832 goto TIDYUP; /* Skip to end of function */
1833 }
1834
1835 /* See if we are at the current header's size limit - there must be at least
1836 four bytes left. This allows for the new character plus a zero, plus two for
1837 extra insertions when we are playing games with dots and carriage returns. If
1838 we are at the limit, extend the text buffer. This could have been done
1839 automatically using string_cat() but because this is a tightish loop storing
1840 only one character at a time, we choose to do it inline. Normally
1841 store_extend() will be able to extend the block; only at the end of a big
1842 store block will a copy be needed. To handle the case of very long headers
1843 (and sometimes lunatic messages can have ones that are 100s of K long) we
1844 call store_release() for strings that have been copied - if the string is at
1845 the start of a block (and therefore the only thing in it, because we aren't
1846 doing any other gets), the block gets freed. We can only do this release if
1847 there were no allocations since the once that we want to free. */
1848
1849 if (ptr >= header_size - 4)
1850 {
1851 int oldsize = header_size;
1852
1853 if (header_size >= INT_MAX/2)
1854 goto OVERSIZE;
1855 header_size *= 2;
1856
1857 if (!store_extend(next->text, oldsize, header_size))
1858 next->text = store_newblock(next->text, header_size, ptr);
1859 }
1860
1861 /* Cope with receiving a binary zero. There is dispute about whether
1862 these should be allowed in RFC 822 messages. The middle view is that they
1863 should not be allowed in headers, at least. Exim takes this attitude at
1864 the moment. We can't just stomp on them here, because we don't know that
1865 this line is a header yet. Set a flag to cause scanning later. */
1866
1867 if (ch == 0) had_zero++;
1868
1869 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1870 those from data files use just LF. Treat LF in local SMTP input as a
1871 terminator too. Treat EOF as a line terminator always. */
1872
1873 if (ch == EOF) goto EOL;
1874
1875 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1876 other MTAs accept this. We are therefore forced into this "liberalisation"
1877 too, so we accept LF as a line terminator whatever the source of the message.
1878 However, if the first line of the message ended with a CRLF, we treat a bare
1879 LF specially by inserting a white space after it to ensure that the header
1880 line is not terminated. */
1881
1882 if (ch == '\n')
1883 {
1884 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1885 else if (first_line_ended_crlf) receive_ungetc(' ');
1886 goto EOL;
1887 }
1888
1889 /* This is not the end of the line. If this is SMTP input and this is
1890 the first character in the line and it is a "." character, ignore it.
1891 This implements the dot-doubling rule, though header lines starting with
1892 dots aren't exactly common. They are legal in RFC 822, though. If the
1893 following is CRLF or LF, this is the line that that terminates the
1894 entire message. We set message_ended to indicate this has happened (to
1895 prevent further reading), and break out of the loop, having freed the
1896 empty header, and set next = NULL to indicate no data line. */
1897
1898 if (ptr == 0 && ch == '.' && f.dot_ends)
1899 {
1900 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1901 if (ch == '\r')
1902 {
1903 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1904 if (ch != '\n')
1905 {
1906 receive_ungetc(ch);
1907 ch = '\r'; /* Revert to CR */
1908 }
1909 }
1910 if (ch == '\n')
1911 {
1912 message_ended = END_DOT;
1913 store_reset(next);
1914 next = NULL;
1915 break; /* End character-reading loop */
1916 }
1917
1918 /* For non-SMTP input, the dot at the start of the line was really a data
1919 character. What is now in ch is the following character. We guaranteed
1920 enough space for this above. */
1921
1922 if (!smtp_input)
1923 {
1924 next->text[ptr++] = '.';
1925 message_size++;
1926 }
1927 }
1928
1929 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1930 remember this case if this is the first line ending. */
1931
1932 if (ch == '\r')
1933 {
1934 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1935 if (ch == '\n')
1936 {
1937 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1938 goto EOL;
1939 }
1940
1941 /* Otherwise, put back the character after CR, and turn the bare CR
1942 into LF SP. */
1943
1944 ch = (receive_ungetc)(ch);
1945 next->text[ptr++] = '\n';
1946 message_size++;
1947 ch = ' ';
1948 }
1949
1950 /* We have a data character for the header line. */
1951
1952 next->text[ptr++] = ch; /* Add to buffer */
1953 message_size++; /* Total message size so far */
1954
1955 /* Handle failure due to a humungously long header section. The >= allows
1956 for the terminating \n. Add what we have so far onto the headers list so
1957 that it gets reflected in any error message, and back up the just-read
1958 character. */
1959
1960 if (message_size >= header_maxsize)
1961 {
1962 OVERSIZE:
1963 next->text[ptr] = 0;
1964 next->slen = ptr;
1965 next->type = htype_other;
1966 next->next = NULL;
1967 header_last->next = next;
1968 header_last = next;
1969
1970 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1971 "%s (more than %d characters): message abandoned",
1972 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1973
1974 if (smtp_input)
1975 {
1976 smtp_reply = US"552 Message header is ridiculously long";
1977 receive_swallow_smtp();
1978 goto TIDYUP; /* Skip to end of function */
1979 }
1980
1981 else
1982 {
1983 give_local_error(ERRMESS_VLONGHEADER,
1984 string_sprintf("message header longer than %d characters received: "
1985 "message not accepted", header_maxsize), US"", error_rc, stdin,
1986 header_list->next);
1987 /* Does not return */
1988 }
1989 }
1990
1991 continue; /* With next input character */
1992
1993 /* End of header line reached */
1994
1995 EOL:
1996
1997 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1998
1999 receive_linecount++;
2000 message_linecount++;
2001
2002 /* Keep track of maximum line length */
2003
2004 if (ptr - prevlines_length > max_received_linelength)
2005 max_received_linelength = ptr - prevlines_length;
2006 prevlines_length = ptr + 1;
2007
2008 /* Now put in the terminating newline. There is always space for
2009 at least two more characters. */
2010
2011 next->text[ptr++] = '\n';
2012 message_size++;
2013
2014 /* A blank line signals the end of the headers; release the unwanted
2015 space and set next to NULL to indicate this. */
2016
2017 if (ptr == 1)
2018 {
2019 store_reset(next);
2020 next = NULL;
2021 break;
2022 }
2023
2024 /* There is data in the line; see if the next input character is a
2025 whitespace character. If it is, we have a continuation of this header line.
2026 There is always space for at least one character at this point. */
2027
2028 if (ch != EOF)
2029 {
2030 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2031 if (nextch == ' ' || nextch == '\t')
2032 {
2033 next->text[ptr++] = nextch;
2034 if (++message_size >= header_maxsize)
2035 goto OVERSIZE;
2036 continue; /* Iterate the loop */
2037 }
2038 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2039 else ch = EOF; /* Cause main loop to exit at end */
2040 }
2041
2042 /* We have got to the real line end. Terminate the string and release store
2043 beyond it. If it turns out to be a real header, internal binary zeros will
2044 be squashed later. */
2045
2046 next->text[ptr] = 0;
2047 next->slen = ptr;
2048 store_reset(next->text + ptr + 1);
2049
2050 /* Check the running total size against the overall message size limit. We
2051 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2052 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2053 headers - the code to read the body will then also hit the buffer. */
2054
2055 if (message_size > thismessage_size_limit) break;
2056
2057 /* A line that is not syntactically correct for a header also marks
2058 the end of the headers. In this case, we leave next containing the
2059 first data line. This might actually be several lines because of the
2060 continuation logic applied above, but that doesn't matter.
2061
2062 It turns out that smail, and presumably sendmail, accept leading lines
2063 of the form
2064
2065 From ph10 Fri Jan 5 12:35 GMT 1996
2066
2067 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2068 find any documentation of this, but for compatibility it had better be
2069 accepted. Exim restricts it to the case of non-smtp messages, and
2070 treats it as an alternative to the -f command line option. Thus it is
2071 ignored except for trusted users or filter testing. Otherwise it is taken
2072 as the sender address, unless -f was used (sendmail compatibility).
2073
2074 It further turns out that some UUCPs generate the From_line in a different
2075 format, e.g.
2076
2077 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2078
2079 The regex for matching these things is now capable of recognizing both
2080 formats (including 2- and 4-digit years in the latter). In fact, the regex
2081 is now configurable, as is the expansion string to fish out the sender.
2082
2083 Even further on it has been discovered that some broken clients send
2084 these lines in SMTP messages. There is now an option to ignore them from
2085 specified hosts or networks. Sigh. */
2086
2087 if ( header_last == header_list
2088 && ( !smtp_input
2089 || ( sender_host_address
2090 && verify_check_host(&ignore_fromline_hosts) == OK
2091 )
2092 || (!sender_host_address && ignore_fromline_local)
2093 )
2094 && regex_match_and_setup(regex_From, next->text, 0, -1)
2095 )
2096 {
2097 if (!f.sender_address_forced)
2098 {
2099 uschar *uucp_sender = expand_string(uucp_from_sender);
2100 if (!uucp_sender)
2101 log_write(0, LOG_MAIN|LOG_PANIC,
2102 "expansion of \"%s\" failed after matching "
2103 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2104 else
2105 {
2106 int start, end, domain;
2107 uschar *errmess;
2108 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2109 &start, &end, &domain, TRUE);
2110 if (newsender)
2111 {
2112 if (domain == 0 && newsender[0] != 0)
2113 newsender = rewrite_address_qualify(newsender, FALSE);
2114
2115 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2116 {
2117 sender_address = newsender;
2118
2119 if (f.trusted_caller || filter_test != FTEST_NONE)
2120 {
2121 authenticated_sender = NULL;
2122 originator_name = US"";
2123 f.sender_local = FALSE;
2124 }
2125
2126 if (filter_test != FTEST_NONE)
2127 printf("Sender taken from \"From \" line\n");
2128 }
2129 }
2130 }
2131 }
2132 }
2133
2134 /* Not a leading "From " line. Check to see if it is a valid header line.
2135 Header names may contain any non-control characters except space and colon,
2136 amazingly. */
2137
2138 else
2139 {
2140 uschar *p = next->text;
2141
2142 /* If not a valid header line, break from the header reading loop, leaving
2143 next != NULL, indicating that it holds the first line of the body. */
2144
2145 if (isspace(*p)) break;
2146 while (mac_isgraph(*p) && *p != ':') p++;
2147 while (isspace(*p)) p++;
2148 if (*p != ':')
2149 {
2150 body_zerocount = had_zero;
2151 break;
2152 }
2153
2154 /* We have a valid header line. If there were any binary zeroes in
2155 the line, stomp on them here. */
2156
2157 if (had_zero > 0)
2158 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2159 *p = '?';
2160
2161 /* It is perfectly legal to have an empty continuation line
2162 at the end of a header, but it is confusing to humans
2163 looking at such messages, since it looks like a blank line.
2164 Reduce confusion by removing redundant white space at the
2165 end. We know that there is at least one printing character
2166 (the ':' tested for above) so there is no danger of running
2167 off the end. */
2168
2169 p = next->text + ptr - 2;
2170 for (;;)
2171 {
2172 while (*p == ' ' || *p == '\t') p--;
2173 if (*p != '\n') break;
2174 ptr = (p--) - next->text + 1;
2175 message_size -= next->slen - ptr;
2176 next->text[ptr] = 0;
2177 next->slen = ptr;
2178 }
2179
2180 /* Add the header to the chain */
2181
2182 next->type = htype_other;
2183 next->next = NULL;
2184 header_last->next = next;
2185 header_last = next;
2186
2187 /* Check the limit for individual line lengths. This comes after adding to
2188 the chain so that the failing line is reflected if a bounce is generated
2189 (for a local message). */
2190
2191 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2192 {
2193 log_write(0, LOG_MAIN, "overlong message header line received from "
2194 "%s (more than %d characters): message abandoned",
2195 f.sender_host_unknown ? sender_ident : sender_fullhost,
2196 header_line_maxsize);
2197
2198 if (smtp_input)
2199 {
2200 smtp_reply = US"552 A message header line is too long";
2201 receive_swallow_smtp();
2202 goto TIDYUP; /* Skip to end of function */
2203 }
2204
2205 else
2206 give_local_error(ERRMESS_VLONGHDRLINE,
2207 string_sprintf("message header line longer than %d characters "
2208 "received: message not accepted", header_line_maxsize), US"",
2209 error_rc, stdin, header_list->next);
2210 /* Does not return */
2211 }
2212
2213 /* Note if any resent- fields exist. */
2214
2215 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2216 {
2217 resents_exist = TRUE;
2218 resent_prefix = US"Resent-";
2219 }
2220 }
2221
2222 /* Reject CHUNKING messages that do not CRLF their first header line */
2223
2224 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2225 {
2226 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2227 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2228 sender_address,
2229 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2230 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2231 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2232 bdat_flush_data();
2233 smtp_reply = US"";
2234 goto TIDYUP; /* Skip to end of function */
2235 }
2236
2237 /* The line has been handled. If we have hit EOF, break out of the loop,
2238 indicating no pending data line. */
2239
2240 if (ch == EOF) { next = NULL; break; }
2241
2242 /* Set up for the next header */
2243
2244 header_size = 256;
2245 next = store_get(sizeof(header_line));
2246 next->text = store_get(header_size);
2247 ptr = 0;
2248 had_zero = 0;
2249 prevlines_length = 0;
2250 } /* Continue, starting to read the next header */
2251
2252 /* At this point, we have read all the headers into a data structure in main
2253 store. The first header is still the dummy placeholder for the Received: header
2254 we are going to generate a bit later on. If next != NULL, it contains the first
2255 data line - which terminated the headers before reaching a blank line (not the
2256 normal case). */
2257
2258 DEBUG(D_receive)
2259 {
2260 debug_printf(">>Headers received:\n");
2261 for (header_line * h = header_list->next; h; h = h->next)
2262 debug_printf("%s", h->text);
2263 debug_printf("\n");
2264 }
2265
2266 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2267 is dropped immediately after valid headers, the next thing we will see is EOF.
2268 We must test for this specially, as further down the reading of the data is
2269 skipped if already at EOF. */
2270
2271 if (smtp_input && (receive_feof)())
2272 {
2273 smtp_reply = handle_lost_connection(US" (after header)");
2274 smtp_yield = FALSE;
2275 goto TIDYUP; /* Skip to end of function */
2276 }
2277
2278 /* If this is a filter test run and no headers were read, output a warning
2279 in case there is a mistake in the test message. */
2280
2281 if (filter_test != FTEST_NONE && header_list->next == NULL)
2282 printf("Warning: no message headers read\n");
2283
2284
2285 /* Scan the headers to identify them. Some are merely marked for later
2286 processing; some are dealt with here. */
2287
2288 for (header_line * h = header_list->next; h; h = h->next)
2289 {
2290 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2291 if (is_resent) contains_resent_headers = TRUE;
2292
2293 switch (header_checkname(h, is_resent))
2294 {
2295 case htype_bcc:
2296 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2297 break;
2298
2299 case htype_cc:
2300 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2301 break;
2302
2303 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2304
2305 case htype_date:
2306 if (!resents_exist || is_resent) date_header_exists = TRUE;
2307 break;
2308
2309 /* Same comments as about Return-Path: below. */
2310
2311 case htype_delivery_date:
2312 if (delivery_date_remove) h->type = htype_old;
2313 break;
2314
2315 /* Same comments as about Return-Path: below. */
2316
2317 case htype_envelope_to:
2318 if (envelope_to_remove) h->type = htype_old;
2319 break;
2320
2321 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2322 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2323 header consists of just the login id of the user who called Exim, rewrite
2324 it with the gecos field first. Apply this rule to Resent-From: if there
2325 are resent- fields. */
2326
2327 case htype_from:
2328 h->type = htype_from;
2329 if (!resents_exist || is_resent)
2330 {
2331 from_header = h;
2332 if (!smtp_input)
2333 {
2334 int len;
2335 uschar *s = Ustrchr(h->text, ':') + 1;
2336 while (isspace(*s)) s++;
2337 len = h->slen - (s - h->text) - 1;
2338 if (Ustrlen(originator_login) == len &&
2339 strncmpic(s, originator_login, len) == 0)
2340 {
2341 uschar *name = is_resent? US"Resent-From" : US"From";
2342 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2343 originator_login, qualify_domain_sender);
2344 from_header = header_last;
2345 h->type = htype_old;
2346 DEBUG(D_receive|D_rewrite)
2347 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2348 }
2349 }
2350 }
2351 break;
2352
2353 /* Identify the Message-id: header for generating "in-reply-to" in the
2354 autoreply transport. For incoming logging, save any resent- value. In both
2355 cases, take just the first of any multiples. */
2356
2357 case htype_id:
2358 if (!msgid_header && (!resents_exist || is_resent))
2359 {
2360 msgid_header = h;
2361 h->type = htype_id;
2362 }
2363 break;
2364
2365 /* Flag all Received: headers */
2366
2367 case htype_received:
2368 h->type = htype_received;
2369 received_count++;
2370 break;
2371
2372 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2373
2374 case htype_reply_to:
2375 h->type = htype_reply_to;
2376 break;
2377
2378 /* The Return-path: header is supposed to be added to messages when
2379 they leave the SMTP system. We shouldn't receive messages that already
2380 contain Return-path. However, since Exim generates Return-path: on
2381 local delivery, resent messages may well contain it. We therefore
2382 provide an option (which defaults on) to remove any Return-path: headers
2383 on input. Removal actually means flagging as "old", which prevents the
2384 header being transmitted with the message. */
2385
2386 case htype_return_path:
2387 if (return_path_remove) h->type = htype_old;
2388
2389 /* If we are testing a mail filter file, use the value of the
2390 Return-Path: header to set up the return_path variable, which is not
2391 otherwise set. However, remove any <> that surround the address
2392 because the variable doesn't have these. */
2393
2394 if (filter_test != FTEST_NONE)
2395 {
2396 uschar *start = h->text + 12;
2397 uschar *end = start + Ustrlen(start);
2398 while (isspace(*start)) start++;
2399 while (end > start && isspace(end[-1])) end--;
2400 if (*start == '<' && end[-1] == '>')
2401 {
2402 start++;
2403 end--;
2404 }
2405 return_path = string_copyn(start, end - start);
2406 printf("Return-path taken from \"Return-path:\" header line\n");
2407 }
2408 break;
2409
2410 /* If there is a "Sender:" header and the message is locally originated,
2411 and from an untrusted caller and suppress_local_fixups is not set, or if we
2412 are in submission mode for a remote message, mark it "old" so that it will
2413 not be transmitted with the message, unless active_local_sender_retain is
2414 set. (This can only be true if active_local_from_check is false.) If there
2415 are any resent- headers in the message, apply this rule to Resent-Sender:
2416 instead of Sender:. Messages with multiple resent- header sets cannot be
2417 tidily handled. (For this reason, at least one MUA - Pine - turns old
2418 resent- headers into X-resent- headers when resending, leaving just one
2419 set.) */
2420
2421 case htype_sender:
2422 h->type = !f.active_local_sender_retain
2423 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2424 || f.submission_mode
2425 )
2426 && (!resents_exist || is_resent)
2427 ? htype_old : htype_sender;
2428 break;
2429
2430 /* Remember the Subject: header for logging. There is no Resent-Subject */
2431
2432 case htype_subject:
2433 subject_header = h;
2434 break;
2435
2436 /* "To:" gets flagged, and the existence of a recipient header is noted,
2437 whether it's resent- or not. */
2438
2439 case htype_to:
2440 h->type = htype_to;
2441 /****
2442 to_or_cc_header_exists = TRUE;
2443 ****/
2444 break;
2445 }
2446 }
2447
2448 /* Extract recipients from the headers if that is required (the -t option).
2449 Note that this is documented as being done *before* any address rewriting takes
2450 place. There are two possibilities:
2451
2452 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2453 recipients already listed are to be REMOVED from the message. Smail 3 works
2454 like this. We need to build a non-recipients tree for that list, because in
2455 subsequent processing this data is held in a tree and that's what the
2456 spool_write_header() function expects. Make sure that non-recipient addresses
2457 are fully qualified and rewritten if necessary.
2458
2459 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2460 those in the command line arguments (and it is rumoured some other MTAs do
2461 this). Therefore, there is an option to make Exim behave this way.
2462
2463 *** Notes on "Resent-" header lines ***
2464
2465 The presence of resent-headers in the message makes -t horribly ambiguous.
2466 Experiments with sendmail showed that it uses recipients for all resent-
2467 headers, totally ignoring the concept of "sets of resent- headers" as described
2468 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2469 with all the addresses in one instance of each header.
2470
2471 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2472 error for -t if there were resent- headers in the message. However, after a
2473 discussion on the mailing list, I've learned that there are MUAs that use
2474 resent- headers with -t, and also that the stuff about sets of resent- headers
2475 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2476 message with -t and resent- header lines makes sure that only *its* resent-
2477 headers are present; previous ones are often renamed as X-resent- for example.
2478
2479 Consequently, Exim has been changed so that, if any resent- header lines are
2480 present, the recipients are taken from all of the appropriate resent- lines,
2481 and not from the ordinary To:, Cc:, etc. */
2482
2483 if (extract_recip)
2484 {
2485 int rcount = 0;
2486 error_block **bnext = &bad_addresses;
2487
2488 if (extract_addresses_remove_arguments)
2489 {
2490 while (recipients_count-- > 0)
2491 {
2492 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2493 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2494 tree_add_nonrecipient(s);
2495 }
2496 recipients_list = NULL;
2497 recipients_count = recipients_list_max = 0;
2498 }
2499
2500 /* Now scan the headers */
2501
2502 for (header_line * h = header_list->next; h; h = h->next)
2503 {
2504 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2505 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2506 {
2507 uschar *s = Ustrchr(h->text, ':') + 1;
2508 while (isspace(*s)) s++;
2509
2510 f.parse_allow_group = TRUE; /* Allow address group syntax */
2511
2512 while (*s != 0)
2513 {
2514 uschar *ss = parse_find_address_end(s, FALSE);
2515 uschar *recipient, *errmess, *pp;
2516 int start, end, domain;
2517
2518 /* Check on maximum */
2519
2520 if (recipients_max > 0 && ++rcount > recipients_max)
2521 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2522 US"message rejected: ", error_rc, stdin, NULL);
2523 /* Does not return */
2524
2525 /* Make a copy of the address, and remove any internal newlines. These
2526 may be present as a result of continuations of the header line. The
2527 white space that follows the newline must not be removed - it is part
2528 of the header. */
2529
2530 pp = recipient = store_get(ss - s + 1);
2531 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2532 *pp = 0;
2533
2534 #ifdef SUPPORT_I18N
2535 {
2536 BOOL b = allow_utf8_domains;
2537 allow_utf8_domains = TRUE;
2538 #endif
2539 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2540 &domain, FALSE);
2541
2542 #ifdef SUPPORT_I18N
2543 if (string_is_utf8(recipient))
2544 message_smtputf8 = TRUE;
2545 else
2546 allow_utf8_domains = b;
2547 }
2548 #endif
2549
2550 /* Keep a list of all the bad addresses so we can send a single
2551 error message at the end. However, an empty address is not an error;
2552 just ignore it. This can come from an empty group list like
2553
2554 To: Recipients of list:;
2555
2556 If there are no recipients at all, an error will occur later. */
2557
2558 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2559 {
2560 int len = Ustrlen(s);
2561 error_block *b = store_get(sizeof(error_block));
2562 while (len > 0 && isspace(s[len-1])) len--;
2563 b->next = NULL;
2564 b->text1 = string_printing(string_copyn(s, len));
2565 b->text2 = errmess;
2566 *bnext = b;
2567 bnext = &(b->next);
2568 }
2569
2570 /* If the recipient is already in the nonrecipients tree, it must
2571 have appeared on the command line with the option extract_addresses_
2572 remove_arguments set. Do not add it to the recipients, and keep a note
2573 that this has happened, in order to give a better error if there are
2574 no recipients left. */
2575
2576 else if (recipient != NULL)
2577 {
2578 if (tree_search(tree_nonrecipients, recipient) == NULL)
2579 receive_add_recipient(recipient, -1);
2580 else
2581 extracted_ignored = TRUE;
2582 }
2583
2584 /* Move on past this address */
2585
2586 s = ss + (*ss? 1:0);
2587 while (isspace(*s)) s++;
2588 } /* Next address */
2589
2590 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2591 f.parse_found_group = FALSE;
2592
2593 /* If this was the bcc: header, mark it "old", which means it
2594 will be kept on the spool, but not transmitted as part of the
2595 message. */
2596
2597 if (h->type == htype_bcc) h->type = htype_old;
2598 } /* For appropriate header line */
2599 } /* For each header line */
2600
2601 }
2602
2603 /* Now build the unique message id. This has changed several times over the
2604 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2605 Retaining all the history in the comment has become too unwieldy - read
2606 previous release sources if you want it.
2607
2608 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2609 The first part is the current time, in seconds. The second part is the current
2610 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2611 can hold a number in the range 0-3843. It used to be a computed sequence
2612 number, but is now the fractional component of the current time in units of
2613 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2614 received, Exim ensures that the timer has ticked at the appropriate level
2615 before proceeding, to avoid duplication if the pid happened to be re-used
2616 within the same time period. It seems likely that most messages will take at
2617 least half a millisecond to be received, so no delay will normally be
2618 necessary. At least for some time...
2619
2620 There is a modification when localhost_number is set. Formerly this was allowed
2621 to be as large as 255. Now it is restricted to the range 0-16, and the final
2622 component of the message id becomes (localhost_number * 200) + fractional time
2623 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2624
2625 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2626 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2627 still allows the tttttt field to hold a large enough number to last for some
2628 more decades, and the final two-digit field can hold numbers up to 1295, which
2629 is enough for milliseconds (instead of 1/2000 of a second).
2630
2631 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2632 pid, so it is probably safe because pids have to be positive. The
2633 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2634 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2635
2636 Note that string_base62() returns its data in a static storage block, so it
2637 must be copied before calling string_base62() again. It always returns exactly
2638 6 characters.
2639
2640 There doesn't seem to be anything in the RFC which requires a message id to
2641 start with a letter, but Smail was changed to ensure this. The external form of
2642 the message id (as supplied by string expansion) therefore starts with an
2643 additional leading 'E'. The spool file names do not include this leading
2644 letter and it is not used internally.
2645
2646 NOTE: If ever the format of message ids is changed, the regular expression for
2647 checking that a string is in this format must be updated in a corresponding
2648 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2649 must also be changed to reflect the correct string length. The queue-sort code
2650 needs to know the layout. Then, of course, other programs that rely on the
2651 message id format will need updating too. */
2652
2653 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2654 message_id[6] = '-';
2655 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2656
2657 /* Deal with the case where the host number is set. The value of the number was
2658 checked when it was read, to ensure it isn't too big. The timing granularity is
2659 left in id_resolution so that an appropriate wait can be done after receiving
2660 the message, if necessary (we hope it won't be). */
2661
2662 if (host_number_string)
2663 {
2664 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2665 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2666 string_base62((long int)(
2667 host_number * (1000000/id_resolution) +
2668 message_id_tv.tv_usec/id_resolution)) + 4);
2669 }
2670
2671 /* Host number not set: final field is just the fractional time at an
2672 appropriate resolution. */
2673
2674 else
2675 {
2676 id_resolution = BASE_62 == 62 ? 500 : 1000;
2677 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2678 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2679 }
2680
2681 /* Add the current message id onto the current process info string if
2682 it will fit. */
2683
2684 (void)string_format(process_info + process_info_len,
2685 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2686
2687 /* If we are using multiple input directories, set up the one for this message
2688 to be the least significant base-62 digit of the time of arrival. Otherwise
2689 ensure that it is an empty string. */
2690
2691 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2692
2693 /* Now that we have the message-id, if there is no message-id: header, generate
2694 one, but only for local (without suppress_local_fixups) or submission mode
2695 messages. This can be user-configured if required, but we had better flatten
2696 any illegal characters therein. */
2697
2698 if ( !msgid_header
2699 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2700 {
2701 uschar *id_text = US"";
2702 uschar *id_domain = primary_hostname;
2703 header_line * h;
2704
2705 /* Permit only letters, digits, dots, and hyphens in the domain */
2706
2707 if (message_id_domain)
2708 {
2709 uschar *new_id_domain = expand_string(message_id_domain);
2710 if (!new_id_domain)
2711 {
2712 if (!f.expand_string_forcedfail)
2713 log_write(0, LOG_MAIN|LOG_PANIC,
2714 "expansion of \"%s\" (message_id_header_domain) "
2715 "failed: %s", message_id_domain, expand_string_message);
2716 }
2717 else if (*new_id_domain)
2718 {
2719 id_domain = new_id_domain;
2720 for (uschar * p = id_domain; *p; p++)
2721 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2722 }
2723 }
2724
2725 /* Permit all characters except controls and RFC 2822 specials in the
2726 additional text part. */
2727
2728 if (message_id_text)
2729 {
2730 uschar *new_id_text = expand_string(message_id_text);
2731 if (!new_id_text)
2732 {
2733 if (!f.expand_string_forcedfail)
2734 log_write(0, LOG_MAIN|LOG_PANIC,
2735 "expansion of \"%s\" (message_id_header_text) "
2736 "failed: %s", message_id_text, expand_string_message);
2737 }
2738 else if (*new_id_text)
2739 {
2740 id_text = new_id_text;
2741 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2742 }
2743 }
2744
2745 /* Add the header line.
2746 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2747 appended, to preserve classical expectations of header ordering. */
2748
2749 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2750 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2751 *id_text == 0 ? "" : ".", id_text, id_domain);
2752
2753 /* Arrange for newly-created Message-Id to be logged */
2754
2755 if (!resents_exist)
2756 {
2757 msgid_header_newly_created = TRUE;
2758 msgid_header = h;
2759 }
2760 }
2761
2762 /* If we are to log recipients, keep a copy of the raw ones before any possible
2763 rewriting. Must copy the count, because later ACLs and the local_scan()
2764 function may mess with the real recipients. */
2765
2766 if (LOGGING(received_recipients))
2767 {
2768 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2769 for (int i = 0; i < recipients_count; i++)
2770 raw_recipients[i] = string_copy(recipients_list[i].address);
2771 raw_recipients_count = recipients_count;
2772 }
2773
2774 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2775 recipients will get here only if the conditions were right (allow_unqualified_
2776 recipient is TRUE). */
2777
2778 for (int i = 0; i < recipients_count; i++)
2779 recipients_list[i].address =
2780 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2781 global_rewrite_rules, rewrite_existflags);
2782
2783 /* If there is no From: header, generate one for local (without
2784 suppress_local_fixups) or submission_mode messages. If there is no sender
2785 address, but the sender is local or this is a local delivery error, use the
2786 originator login. This shouldn't happen for genuine bounces, but might happen
2787 for autoreplies. The addition of From: must be done *before* checking for the
2788 possible addition of a Sender: header, because untrusted_set_sender allows an
2789 untrusted user to set anything in the envelope (which might then get info
2790 From:) but we still want to ensure a valid Sender: if it is required. */
2791
2792 if ( !from_header
2793 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2794 {
2795 uschar *oname = US"";
2796
2797 /* Use the originator_name if this is a locally submitted message and the
2798 caller is not trusted. For trusted callers, use it only if -F was used to
2799 force its value or if we have a non-SMTP message for which -f was not used
2800 to set the sender. */
2801
2802 if (!sender_host_address)
2803 {
2804 if (!f.trusted_caller || f.sender_name_forced ||
2805 (!smtp_input && !f.sender_address_forced))
2806 oname = originator_name;
2807 }
2808
2809 /* For non-locally submitted messages, the only time we use the originator
2810 name is when it was forced by the /name= option on control=submission. */
2811
2812 else if (submission_name) oname = submission_name;
2813
2814 /* Envelope sender is empty */
2815
2816 if (!*sender_address)
2817 {
2818 uschar *fromstart, *fromend;
2819
2820 fromstart = string_sprintf("%sFrom: %s%s",
2821 resent_prefix, oname, *oname ? " <" : "");
2822 fromend = *oname ? US">" : US"";
2823
2824 if (f.sender_local || f.local_error_message)
2825 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2826 local_part_quote(originator_login), qualify_domain_sender,
2827 fromend);
2828
2829 else if (f.submission_mode && authenticated_id)
2830 {
2831 if (!submission_domain)
2832 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2833 local_part_quote(authenticated_id), qualify_domain_sender,
2834 fromend);
2835
2836 else if (!*submission_domain) /* empty => whole address set */
2837 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2838 fromend);
2839
2840 else
2841 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2842 local_part_quote(authenticated_id), submission_domain, fromend);
2843
2844 from_header = header_last; /* To get it checked for Sender: */
2845 }
2846 }
2847
2848 /* There is a non-null envelope sender. Build the header using the original
2849 sender address, before any rewriting that might have been done while
2850 verifying it. */
2851
2852 else
2853 {
2854 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2855 oname,
2856 *oname ? " <" : "",
2857 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2858 *oname ? ">" : "");
2859
2860 from_header = header_last; /* To get it checked for Sender: */
2861 }
2862 }
2863
2864
2865 /* If the sender is local (without suppress_local_fixups), or if we are in
2866 submission mode and there is an authenticated_id, check that an existing From:
2867 is correct, and if not, generate a Sender: header, unless disabled. Any
2868 previously-existing Sender: header was removed above. Note that sender_local,
2869 as well as being TRUE if the caller of exim is not trusted, is also true if a
2870 trusted caller did not supply a -f argument for non-smtp input. To allow
2871 trusted callers to forge From: without supplying -f, we have to test explicitly
2872 here. If the From: header contains more than one address, then the call to
2873 parse_extract_address fails, and a Sender: header is inserted, as required. */
2874
2875 if ( from_header
2876 && ( f.active_local_from_check
2877 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2878 || f.submission_mode && authenticated_id
2879 ) ) )
2880 {
2881 BOOL make_sender = TRUE;
2882 int start, end, domain;
2883 uschar *errmess;
2884 uschar *from_address =
2885 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2886 &start, &end, &domain, FALSE);
2887 uschar *generated_sender_address;
2888
2889 generated_sender_address = f.submission_mode
2890 ? !submission_domain
2891 ? string_sprintf("%s@%s",
2892 local_part_quote(authenticated_id), qualify_domain_sender)
2893 : !*submission_domain /* empty => full address */
2894 ? string_sprintf("%s", authenticated_id)
2895 : string_sprintf("%s@%s",
2896 local_part_quote(authenticated_id), submission_domain)
2897 : string_sprintf("%s@%s",
2898 local_part_quote(originator_login), qualify_domain_sender);
2899
2900 /* Remove permitted prefixes and suffixes from the local part of the From:
2901 address before doing the comparison with the generated sender. */
2902
2903 if (from_address)
2904 {
2905 int slen;
2906 uschar *at = domain ? from_address + domain - 1 : NULL;
2907
2908 if (at) *at = 0;
2909 from_address += route_check_prefix(from_address, local_from_prefix);
2910 slen = route_check_suffix(from_address, local_from_suffix);
2911 if (slen > 0)
2912 {
2913 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2914 from_address += slen;
2915 }
2916 if (at) *at = '@';
2917
2918 if ( strcmpic(generated_sender_address, from_address) == 0
2919 || (!domain && strcmpic(from_address, originator_login) == 0))
2920 make_sender = FALSE;
2921 }
2922
2923 /* We have to cause the Sender header to be rewritten if there are
2924 appropriate rewriting rules. */
2925
2926 if (make_sender)
2927 if (f.submission_mode && !submission_name)
2928 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2929 generated_sender_address);
2930 else
2931 header_add(htype_sender, "%sSender: %s <%s>\n",
2932 resent_prefix,
2933 f.submission_mode ? submission_name : originator_name,
2934 generated_sender_address);
2935
2936 /* Ensure that a non-null envelope sender address corresponds to the
2937 submission mode sender address. */
2938
2939 if (f.submission_mode && *sender_address)
2940 {
2941 if (!sender_address_unrewritten)
2942 sender_address_unrewritten = sender_address;
2943 sender_address = generated_sender_address;
2944 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2945 log_write(L_address_rewrite, LOG_MAIN,
2946 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2947 sender_address_unrewritten, generated_sender_address);
2948 }
2949 }
2950
2951 /* If there are any rewriting rules, apply them to the sender address, unless
2952 it has already been rewritten as part of verification for SMTP input. */
2953
2954 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2955 {
2956 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2957 global_rewrite_rules, rewrite_existflags);
2958 DEBUG(D_receive|D_rewrite)
2959 debug_printf("rewritten sender = %s\n", sender_address);
2960 }
2961
2962
2963 /* The headers must be run through rewrite_header(), because it ensures that
2964 addresses are fully qualified, as well as applying any rewriting rules that may
2965 exist.
2966
2967 Qualification of header addresses in a message from a remote host happens only
2968 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2969 appropriate. For local messages, qualification always happens, unless -bnq is
2970 used to explicitly suppress it. No rewriting is done for an unqualified address
2971 that is left untouched.
2972
2973 We start at the second header, skipping our own Received:. This rewriting is
2974 documented as happening *after* recipient addresses are taken from the headers
2975 by the -t command line option. An added Sender: gets rewritten here. */
2976
2977 for (header_line * h = header_list->next; h; h = h->next)
2978 {
2979 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2980 rewrite_existflags, TRUE);
2981 if (newh) h = newh;
2982 }
2983
2984
2985 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2986 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2987 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2988 exists, this applies to the set of resent- headers rather than the normal set.
2989
2990 The requirement for a recipient header has been removed in RFC 2822. At this
2991 point in the code, earlier versions of Exim added a To: header for locally
2992 submitted messages, and an empty Bcc: header for others. In the light of the
2993 changes in RFC 2822, this was dropped in November 2003. */
2994
2995
2996 /* If there is no date header, generate one if the message originates locally
2997 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2998 submission mode flag is set. Messages without Date: are not valid, but it seems
2999 to be more confusing if Exim adds one to all remotely-originated messages.
3000 As per Message-Id, we prepend if resending, else append.
3001 */
3002
3003 if ( !date_header_exists
3004 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3005 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3006 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3007
3008 search_tidyup(); /* Free any cached resources */
3009
3010 /* Show the complete set of headers if debugging. Note that the first one (the
3011 new Received:) has not yet been set. */
3012
3013 DEBUG(D_receive)
3014 {
3015 debug_printf(">>Headers after rewriting and local additions:\n");
3016 for (header_line * h = header_list->next; h; h = h->next)
3017 debug_printf("%c %s", h->type, h->text);
3018 debug_printf("\n");
3019 }
3020
3021 /* The headers are now complete in store. If we are running in filter
3022 testing mode, that is all this function does. Return TRUE if the message
3023 ended with a dot. */
3024
3025 if (filter_test != FTEST_NONE)
3026 {
3027 process_info[process_info_len] = 0;
3028 return message_ended == END_DOT;
3029 }
3030
3031 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3032 think more if it could be handled. Cannot do onward CHUNKING unless
3033 inbound is, but inbound chunking ought to be ok with outbound plain.
3034 Could we do onward CHUNKING given inbound CHUNKING?
3035 */
3036 if (chunking_state > CHUNKING_OFFERED)
3037 cancel_cutthrough_connection(FALSE, US"chunking active");
3038
3039 /* Cutthrough delivery:
3040 We have to create the Received header now rather than at the end of reception,
3041 so the timestamp behaviour is a change to the normal case.
3042 Having created it, send the headers to the destination. */
3043
3044 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3045 {
3046 if (received_count > received_headers_max)
3047 {
3048 cancel_cutthrough_connection(TRUE, US"too many headers");
3049 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3050 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3051 "Too many \"Received\" headers",
3052 sender_address,
3053 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3054 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3055 message_id[0] = 0; /* Indicate no message accepted */
3056 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3057 goto TIDYUP; /* Skip to end of function */
3058 }
3059 received_header_gen();
3060 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3061 (void) cutthrough_headers_send();
3062 }
3063
3064
3065 /* Open a new spool file for the data portion of the message. We need
3066 to access it both via a file descriptor and a stream. Try to make the
3067 directory if it isn't there. */
3068
3069 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3070 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3071
3072 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3073 {
3074 if (errno == ENOENT)
3075 {
3076 (void) directory_make(spool_directory,
3077 spool_sname(US"input", message_subdir),
3078 INPUT_DIRECTORY_MODE, TRUE);
3079 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3080 }
3081 if (data_fd < 0)
3082 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3083 spool_name, strerror(errno));
3084 }
3085
3086 /* Make sure the file's group is the Exim gid, and double-check the mode
3087 because the group setting doesn't always get set automatically. */
3088
3089 if (fchown(data_fd, exim_uid, exim_gid))
3090 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3091 "Failed setting ownership on spool file %s: %s",
3092 spool_name, strerror(errno));
3093 (void)fchmod(data_fd, SPOOL_MODE);
3094
3095 /* We now have data file open. Build a stream for it and lock it. We lock only
3096 the first line of the file (containing the message ID) because otherwise there
3097 are problems when Exim is run under Cygwin (I'm told). See comments in
3098 spool_in.c, where the same locking is done. */
3099
3100 spool_data_file = fdopen(data_fd, "w+");
3101 lock_data.l_type = F_WRLCK;
3102 lock_data.l_whence = SEEK_SET;
3103 lock_data.l_start = 0;
3104 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3105
3106 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3107 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3108 errno, strerror(errno));
3109
3110 /* We have an open, locked data file. Write the message id to it to make it
3111 self-identifying. Then read the remainder of the input of this message and
3112 write it to the data file. If the variable next != NULL, it contains the first
3113 data line (which was read as a header but then turned out not to have the right
3114 format); write it (remembering that it might contain binary zeros). The result
3115 of fwrite() isn't inspected; instead we call ferror() below. */
3116
3117 fprintf(spool_data_file, "%s-D\n", message_id);
3118 if (next)
3119 {
3120 uschar *s = next->text;
3121 int len = next->slen;
3122 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3123 body_linecount++; /* Assumes only 1 line */
3124 }
3125
3126 /* Note that we might already be at end of file, or the logical end of file
3127 (indicated by '.'), or might have encountered an error while writing the
3128 message id or "next" line. */
3129
3130 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3131 {
3132 if (smtp_input)
3133 {
3134 message_ended = chunking_state <= CHUNKING_OFFERED
3135 ? read_message_data_smtp(spool_data_file)
3136 : spool_wireformat
3137 ? read_message_bdat_smtp_wire(spool_data_file)
3138 : read_message_bdat_smtp(spool_data_file);
3139 receive_linecount++; /* The terminating "." line */
3140 }
3141 else
3142 message_ended = read_message_data(spool_data_file);
3143
3144 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3145 message_linecount += body_linecount;
3146
3147 switch (message_ended)
3148 {
3149 /* Handle premature termination of SMTP */
3150
3151 case END_EOF:
3152 if (smtp_input)
3153 {
3154 Uunlink(spool_name); /* Lose data file when closed */
3155 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3156 message_id[0] = 0; /* Indicate no message accepted */
3157 smtp_reply = handle_lost_connection(US"");
3158 smtp_yield = FALSE;
3159 goto TIDYUP; /* Skip to end of function */
3160 }
3161 break;
3162
3163 /* Handle message that is too big. Don't use host_or_ident() in the log
3164 message; we want to see the ident value even for non-remote messages. */
3165
3166 case END_SIZE:
3167 Uunlink(spool_name); /* Lose the data file when closed */
3168 cancel_cutthrough_connection(TRUE, US"mail too big");
3169 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3170
3171 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3172 "message too big: read=%d max=%d",
3173 sender_address,
3174 sender_fullhost ? " H=" : "",
3175 sender_fullhost ? sender_fullhost : US"",
3176 sender_ident ? " U=" : "",
3177 sender_ident ? sender_ident : US"",
3178 message_size,
3179 thismessage_size_limit);
3180
3181 if (smtp_input)
3182 {
3183 smtp_reply = US"552 Message size exceeds maximum permitted";
3184 message_id[0] = 0; /* Indicate no message accepted */
3185 goto TIDYUP; /* Skip to end of function */
3186 }
3187 else
3188 {
3189 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3190 give_local_error(ERRMESS_TOOBIG,
3191 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3192 US"message rejected: ", error_rc, spool_data_file, header_list);
3193 /* Does not return */
3194 }
3195 break;
3196
3197 /* Handle bad BDAT protocol sequence */
3198
3199 case END_PROTOCOL:
3200 Uunlink(spool_name); /* Lose the data file when closed */
3201 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3202 smtp_reply = US""; /* Response already sent */
3203 message_id[0] = 0; /* Indicate no message accepted */
3204 goto TIDYUP; /* Skip to end of function */
3205 }
3206 }
3207
3208 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3209 example, there may be some expansion in an ACL that uses a timer.) */
3210
3211 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3212
3213 /* The message body has now been read into the data file. Call fflush() to
3214 empty the buffers in C, and then call fsync() to get the data written out onto
3215 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3216 having to do this). If there was an I/O error on either input or output,
3217 attempt to send an error message, and unlink the spool file. For non-SMTP input
3218 we can then give up. Note that for SMTP input we must swallow the remainder of
3219 the input in cases of output errors, since the far end doesn't expect to see
3220 anything until the terminating dot line is sent. */
3221
3222 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3223 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3224 {
3225 uschar *msg_errno = US strerror(errno);
3226 BOOL input_error = (receive_ferror)() != 0;
3227 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3228 input_error? "Input read" : "Spool write",
3229 msg_errno,
3230 sender_fullhost ? sender_fullhost : sender_ident);
3231
3232 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3233 Uunlink(spool_name); /* Lose the data file */
3234 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3235
3236 if (smtp_input)
3237 {
3238 if (input_error)
3239 smtp_reply = US"451 Error while reading input data";
3240 else
3241 {
3242 smtp_reply = US"451 Error while writing spool file";
3243 receive_swallow_smtp();
3244 }
3245 message_id[0] = 0; /* Indicate no message accepted */
3246 goto TIDYUP; /* Skip to end of function */
3247 }
3248
3249 else
3250 {
3251 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3252 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3253 header_list);
3254 /* Does not return */
3255 }
3256 }
3257
3258
3259 /* No I/O errors were encountered while writing the data file. */
3260
3261 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3262 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3263
3264
3265 /* If there were any bad addresses extracted by -t, or there were no recipients
3266 left after -t, send a message to the sender of this message, or write it to
3267 stderr if the error handling option is set that way. Note that there may
3268 legitimately be no recipients for an SMTP message if they have all been removed
3269 by "discard".
3270
3271 We need to rewind the data file in order to read it. In the case of no
3272 recipients or stderr error writing, throw the data file away afterwards, and
3273 exit. (This can't be SMTP, which always ensures there's at least one
3274 syntactically good recipient address.) */
3275
3276 if (extract_recip && (bad_addresses || recipients_count == 0))
3277 {
3278 DEBUG(D_receive)
3279 {
3280 if (recipients_count == 0) debug_printf("*** No recipients\n");
3281 if (bad_addresses)
3282 {
3283 debug_printf("*** Bad address(es)\n");
3284 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3285 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3286 }
3287 }
3288
3289 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3290 message_id, bad_addresses ? "bad addresses" : "no recipients");
3291
3292 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3293
3294 /* If configured to send errors to the sender, but this fails, force
3295 a failure error code. We use a special one for no recipients so that it
3296 can be detected by the autoreply transport. Otherwise error_rc is set to
3297 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3298 it is EXIT_SUCCESS. */
3299
3300 if (error_handling == ERRORS_SENDER)
3301 {
3302 if (!moan_to_sender(
3303 bad_addresses
3304 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3305 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3306 bad_addresses, header_list, spool_data_file, FALSE
3307 ) )
3308 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3309 }
3310 else
3311 {
3312 if (!bad_addresses)
3313 if (extracted_ignored)
3314 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3315 else
3316 fprintf(stderr, "exim: no recipients in message\n");
3317 else
3318 {
3319 fprintf(stderr, "exim: invalid address%s",
3320 bad_addresses->next ? "es:\n" : ":");
3321 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3322 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3323 bad_addresses->text2);
3324 }
3325 }
3326
3327 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3328 {
3329 Uunlink(spool_name);
3330 (void)fclose(spool_data_file);
3331 exim_exit(error_rc, US"receiving");
3332 }
3333 }
3334
3335 /* Data file successfully written. Generate text for the Received: header by
3336 expanding the configured string, and adding a timestamp. By leaving this
3337 operation till now, we ensure that the timestamp is the time that message
3338 reception was completed. However, this is deliberately done before calling the
3339 data ACL and local_scan().
3340
3341 This Received: header may therefore be inspected by the data ACL and by code in
3342 the local_scan() function. When they have run, we update the timestamp to be
3343 the final time of reception.
3344
3345 If there is just one recipient, set up its value in the $received_for variable
3346 for use when we generate the Received: header.
3347
3348 Note: the checking for too many Received: headers is handled by the delivery
3349 code. */
3350 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3351
3352 if (!received_header->text) /* Non-cutthrough case */
3353 {
3354 received_header_gen();
3355
3356 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3357
3358 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3359 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3360
3361 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3362 now, before running the DATA ACL. */
3363
3364 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3365 }
3366 else
3367 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3368 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3369
3370 /* If an ACL is specified for checking things at this stage of reception of a
3371 message, run it, unless all the recipients were removed by "discard" in earlier
3372 ACLs. That is the only case in which recipients_count can be zero at this
3373 stage. Set deliver_datafile to point to the data file so that $message_body and
3374 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3375 */
3376
3377 deliver_datafile = data_fd;
3378 user_msg = NULL;
3379
3380 f.enable_dollar_recipients = TRUE;
3381
3382 if (recipients_count == 0)
3383 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3384
3385 else
3386 {
3387 /* Handle interactive SMTP messages */
3388
3389 if (smtp_input && !smtp_batched_input)
3390 {
3391
3392 #ifndef DISABLE_DKIM
3393 if (!f.dkim_disable_verify)
3394 {
3395 /* Finish verification */
3396 dkim_exim_verify_finish();
3397
3398 /* Check if we must run the DKIM ACL */
3399 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3400 {
3401 uschar * dkim_verify_signers_expanded =
3402 expand_string(dkim_verify_signers);
3403 gstring * results = NULL;
3404 int signer_sep = 0;
3405 const uschar * ptr;
3406 uschar * item;
3407 gstring * seen_items = NULL;
3408 int old_pool = store_pool;
3409
3410 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3411
3412 if (!(ptr = dkim_verify_signers_expanded))
3413 log_write(0, LOG_MAIN|LOG_PANIC,
3414 "expansion of dkim_verify_signers option failed: %s",
3415 expand_string_message);
3416
3417 /* Default to OK when no items are present */
3418 rc = OK;
3419 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3420 {
3421 /* Prevent running ACL for an empty item */
3422 if (!item || !*item) continue;
3423
3424 /* Only run ACL once for each domain or identity,
3425 no matter how often it appears in the expanded list. */
3426 if (seen_items)
3427 {
3428 uschar * seen_item;
3429 const uschar * seen_items_list = string_from_gstring(seen_items);
3430 int seen_sep = ':';
3431 BOOL seen_this_item = FALSE;
3432
3433 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3434 NULL, 0)))
3435 if (Ustrcmp(seen_item,item) == 0)
3436 {
3437 seen_this_item = TRUE;
3438 break;
3439 }
3440
3441 if (seen_this_item)
3442 {
3443 DEBUG(D_receive)
3444 debug_printf("acl_smtp_dkim: skipping signer %s, "
3445 "already seen\n", item);
3446 continue;
3447 }
3448
3449 seen_items = string_catn(seen_items, US":", 1);
3450 }
3451 seen_items = string_cat(seen_items, item);
3452
3453 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3454 if (rc != OK)
3455 {
3456 DEBUG(D_receive)
3457 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3458 "skipping remaining items\n", rc, item);
3459 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3460 break;
3461 }
3462 }
3463 dkim_verify_status = string_from_gstring(results);
3464 store_pool = old_pool;
3465 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3466 if (rc == DISCARD)
3467 {
3468 recipients_count = 0;
3469 blackholed_by = US"DKIM ACL";
3470 if (log_msg)
3471 blackhole_log_msg = string_sprintf(": %s", log_msg);
3472 }
3473 else if (rc != OK)
3474 {
3475 Uunlink(spool_name);
3476 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3477 smtp_yield = FALSE; /* No more messages after dropped connection */
3478 smtp_reply = US""; /* Indicate reply already sent */
3479 message_id[0] = 0; /* Indicate no message accepted */
3480 goto TIDYUP; /* Skip to end of function */
3481 }
3482 }
3483 else
3484 dkim_exim_verify_log_all();
3485 }
3486 #endif /* DISABLE_DKIM */
3487
3488 #ifdef WITH_CONTENT_SCAN
3489 if ( recipients_count > 0
3490 && acl_smtp_mime
3491 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3492 )
3493 goto TIDYUP;
3494 #endif /* WITH_CONTENT_SCAN */
3495
3496 #ifdef EXPERIMENTAL_DMARC
3497 dmarc_up = dmarc_store_data(from_header);
3498 #endif /* EXPERIMENTAL_DMARC */
3499
3500 #ifndef DISABLE_PRDR
3501 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3502 {
3503 int all_pass = OK;
3504 int all_fail = FAIL;
3505
3506 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3507 /* Loop through recipients, responses must be in same order received */
3508 for (unsigned int c = 0; recipients_count > c; c++)
3509 {
3510 uschar * addr= recipients_list[c].address;
3511 uschar * msg= US"PRDR R=<%s> %s";
3512 uschar * code;
3513 DEBUG(D_receive)
3514 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3515 addr, c+1, recipients_count);
3516 rc = acl_check(ACL_WHERE_PRDR, addr,
3517 acl_smtp_data_prdr, &user_msg, &log_msg);
3518
3519 /* If any recipient rejected content, indicate it in final message */
3520 all_pass |= rc;
3521 /* If all recipients rejected, indicate in final message */
3522 all_fail &= rc;
3523
3524 switch (rc)
3525 {
3526 case OK: case DISCARD: code = US"250"; break;
3527 case DEFER: code = US"450"; break;
3528 default: code = US"550"; break;
3529 }
3530 if (user_msg != NULL)
3531 smtp_user_msg(code, user_msg);
3532 else
3533 {
3534 switch (rc)
3535 {
3536 case OK: case DISCARD:
3537 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3538 case DEFER:
3539 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3540 default:
3541 msg = string_sprintf(CS msg, addr, "refusal"); break;
3542 }
3543 smtp_user_msg(code, msg);
3544 }
3545 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3546 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3547 else log_write(0, LOG_MAIN, "%s", CS msg);
3548
3549 if (rc != OK) { receive_remove_recipient(addr); c--; }
3550 }
3551 /* Set up final message, used if data acl gives OK */
3552 smtp_reply = string_sprintf("%s id=%s message %s",
3553 all_fail == FAIL ? US"550" : US"250",
3554 message_id,
3555 all_fail == FAIL
3556 ? US"rejected for all recipients"
3557 : all_pass == OK
3558 ? US"accepted"
3559 : US"accepted for some recipients");
3560 if (recipients_count == 0)
3561 {
3562 message_id[0] = 0; /* Indicate no message accepted */
3563 goto TIDYUP;
3564 }
3565 }
3566 else
3567 prdr_requested = FALSE;
3568 #endif /* !DISABLE_PRDR */
3569
3570 /* Check the recipients count again, as the MIME ACL might have changed
3571 them. */
3572
3573 if (acl_smtp_data != NULL && recipients_count > 0)
3574 {
3575 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3576 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3577 if (rc == DISCARD)
3578 {
3579 recipients_count = 0;
3580 blackholed_by = US"DATA ACL";
3581 if (log_msg)
3582 blackhole_log_msg = string_sprintf(": %s", log_msg);
3583 cancel_cutthrough_connection(TRUE, US"data acl discard");
3584 }
3585 else if (rc != OK)
3586 {
3587 Uunlink(spool_name);
3588 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3589 #ifdef WITH_CONTENT_SCAN
3590 unspool_mbox();
3591 #endif
3592 #ifdef EXPERIMENTAL_DCC
3593 dcc_ok = 0;
3594 #endif
3595 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3596 smtp_yield = FALSE; /* No more messages after dropped connection */
3597 smtp_reply = US""; /* Indicate reply already sent */
3598 message_id[0] = 0; /* Indicate no message accepted */
3599 goto TIDYUP; /* Skip to end of function */
3600 }
3601 }
3602 }
3603
3604 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3605 we cannot take different actions for permanent and temporary rejections. */
3606
3607 else
3608 {
3609
3610 #ifdef WITH_CONTENT_SCAN
3611 if ( acl_not_smtp_mime
3612 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3613 &blackholed_by)
3614 )
3615 goto TIDYUP;
3616 #endif /* WITH_CONTENT_SCAN */
3617
3618 if (acl_not_smtp)
3619 {
3620 uschar *user_msg, *log_msg;
3621 f.authentication_local = TRUE;
3622 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3623 if (rc == DISCARD)
3624 {
3625 recipients_count = 0;
3626 blackholed_by = US"non-SMTP ACL";
3627 if (log_msg)
3628 blackhole_log_msg = string_sprintf(": %s", log_msg);
3629 }
3630 else if (rc != OK)
3631 {
3632 Uunlink(spool_name);
3633 #ifdef WITH_CONTENT_SCAN
3634 unspool_mbox();
3635 #endif
3636 #ifdef EXPERIMENTAL_DCC
3637 dcc_ok = 0;
3638 #endif
3639 /* The ACL can specify where rejections are to be logged, possibly
3640 nowhere. The default is main and reject logs. */
3641
3642 if (log_reject_target)
3643 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3644 sender_address, log_msg);
3645
3646 if (!user_msg) user_msg = US"local configuration problem";
3647 if (smtp_batched_input)
3648 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3649 /* Does not return */
3650 else
3651 {
3652 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3653 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3654 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3655 header_list);
3656 /* Does not return */
3657 }
3658 }
3659 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3660 }
3661 }
3662
3663 /* The applicable ACLs have been run */
3664
3665 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3666 if (f.queue_only_policy) queued_by = US"ACL";
3667 }
3668
3669 #ifdef WITH_CONTENT_SCAN
3670 unspool_mbox();
3671 #endif
3672
3673 #ifdef EXPERIMENTAL_DCC
3674 dcc_ok = 0;
3675 #endif
3676
3677
3678 #ifdef HAVE_LOCAL_SCAN
3679 /* The final check on the message is to run the scan_local() function. The
3680 version supplied with Exim always accepts, but this is a hook for sysadmins to
3681 supply their own checking code. The local_scan() function is run even when all
3682 the recipients have been discarded. */
3683
3684 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3685
3686 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3687 deleted, and the incident gets logged. */
3688
3689 if (sigsetjmp(local_scan_env, 1) == 0)
3690 {
3691 had_local_scan_crash = 0;
3692 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3693 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3694 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3695 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3696
3697 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3698 local_scan_timeout);
3699 local_scan_data = NULL;
3700
3701 had_local_scan_timeout = 0;
3702 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3703 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3704 rc = local_scan(data_fd, &local_scan_data);
3705 ALARM_CLR(0);
3706 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3707
3708 f.enable_dollar_recipients = FALSE;
3709
3710 store_pool = POOL_MAIN; /* In case changed */
3711 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3712 local_scan_data);
3713
3714 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3715 os_non_restarting_signal(SIGFPE, SIG_DFL);
3716 os_non_restarting_signal(SIGILL, SIG_DFL);
3717 os_non_restarting_signal(SIGBUS, SIG_DFL);
3718 }
3719 else
3720 {
3721 if (had_local_scan_crash)
3722 {
3723 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3724 "signal %d - message temporarily rejected (size %d)",
3725 had_local_scan_crash, message_size);
3726 receive_bomb_out(US"local-scan-error", US"local verification problem");
3727 /* Does not return */
3728 }
3729 if (had_local_scan_timeout)
3730 {
3731 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3732 "message temporarily rejected (size %d)", message_size);
3733 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3734 /* Does not return */
3735 }
3736 }
3737
3738 /* The length check is paranoia against some runaway code, and also because
3739 (for a success return) lines in the spool file are read into big_buffer. */
3740
3741 if (local_scan_data)
3742 {
3743 int len = Ustrlen(local_scan_data);
3744 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3745 local_scan_data = string_copyn(local_scan_data, len);
3746 }
3747
3748 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3749 {
3750 if (!f.deliver_freeze) /* ACL might have already frozen */
3751 {
3752 f.deliver_freeze = TRUE;
3753 deliver_frozen_at = time(NULL);
3754 frozen_by = US"local_scan()";
3755 }
3756 rc = LOCAL_SCAN_ACCEPT;
3757 }
3758 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3759 {
3760 if (!f.queue_only_policy) /* ACL might have already queued */
3761 {
3762 f.queue_only_policy = TRUE;
3763 queued_by = US"local_scan()";
3764 }
3765 rc = LOCAL_SCAN_ACCEPT;
3766 }
3767
3768 /* Message accepted: remove newlines in local_scan_data because otherwise
3769 the spool file gets corrupted. Ensure that all recipients are qualified. */
3770
3771 if (rc == LOCAL_SCAN_ACCEPT)
3772 {
3773 if (local_scan_data)
3774 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3775 for (int i = 0; i < recipients_count; i++)
3776 {
3777 recipient_item *r = recipients_list + i;
3778 r->address = rewrite_address_qualify(r->address, TRUE);
3779 if (r->errors_to)
3780 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3781 }
3782 if (recipients_count == 0 && !blackholed_by)
3783 blackholed_by = US"local_scan";
3784 }
3785
3786 /* Message rejected: newlines permitted in local_scan_data to generate
3787 multiline SMTP responses. */
3788
3789 else
3790 {
3791 uschar *istemp = US"";
3792 uschar *smtp_code;
3793 gstring * g;
3794
3795 errmsg = local_scan_data;
3796
3797 Uunlink(spool_name); /* Cancel this message */
3798 switch(rc)
3799 {
3800 default:
3801 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3802 "rejection given", rc);
3803 goto TEMPREJECT;
3804
3805 case LOCAL_SCAN_REJECT_NOLOGHDR:
3806 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3807 /* Fall through */
3808
3809 case LOCAL_SCAN_REJECT:
3810 smtp_code = US"550";
3811 if (!errmsg) errmsg = US"Administrative prohibition";
3812 break;
3813
3814 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3815 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3816 /* Fall through */
3817
3818 case LOCAL_SCAN_TEMPREJECT:
3819 TEMPREJECT:
3820 smtp_code = US"451";
3821 if (!errmsg) errmsg = US"Temporary local problem";
3822 istemp = US"temporarily ";
3823 break;
3824 }
3825
3826 g = string_append(NULL, 2, US"F=",
3827 sender_address[0] == 0 ? US"<>" : sender_address);
3828 g = add_host_info_for_log(g);
3829
3830 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3831 string_from_gstring(g), istemp, string_printing(errmsg));
3832
3833 if (smtp_input)
3834 {
3835 if (!smtp_batched_input)
3836 {
3837 smtp_respond(smtp_code, 3, TRUE, errmsg);
3838 message_id[0] = 0; /* Indicate no message accepted */
3839 smtp_reply = US""; /* Indicate reply already sent */
3840 goto TIDYUP; /* Skip to end of function */
3841 }
3842 else
3843 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3844 /* Does not return */
3845 }
3846 else
3847 {
3848 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3849 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3850 US"message rejected by local scan code: ", error_rc, spool_data_file,
3851 header_list);
3852 /* Does not return */
3853 }
3854 }
3855
3856 /* Reset signal handlers to ignore signals that previously would have caused
3857 the message to be abandoned. */
3858
3859 signal(SIGTERM, SIG_IGN);
3860 signal(SIGINT, SIG_IGN);
3861 #endif /* HAVE_LOCAL_SCAN */
3862
3863
3864 /* Ensure the first time flag is set in the newly-received message. */
3865
3866 f.deliver_firsttime = TRUE;
3867
3868 #ifdef EXPERIMENTAL_BRIGHTMAIL
3869 if (bmi_run == 1)
3870 { /* rewind data file */
3871 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3872 bmi_verdicts = bmi_process_message(header_list, data_fd);
3873 }
3874 #endif
3875
3876 /* Update the timestamp in our Received: header to account for any time taken by
3877 an ACL or by local_scan(). The new time is the time that all reception
3878 processing is complete. */
3879
3880 timestamp = expand_string(US"${tod_full}");
3881 tslen = Ustrlen(timestamp);
3882
3883 memcpy(received_header->text + received_header->slen - tslen - 1,
3884 timestamp, tslen);
3885
3886 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3887
3888 if (mua_wrapper)
3889 {
3890 f.deliver_freeze = FALSE;
3891 f.queue_only_policy = FALSE;
3892 }
3893
3894 /* Keep the data file open until we have written the header file, in order to
3895 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3896 don't write the header file, and we unlink the data file. If writing the header
3897 file fails, we have failed to accept this message. */
3898
3899 if (host_checking || blackholed_by)
3900 {
3901 Uunlink(spool_name);
3902 msg_size = 0; /* Compute size for log line */
3903 for (header_line * h = header_list; h; h = h->next)
3904 if (h->type != '*') msg_size += h->slen;
3905 }
3906
3907 /* Write the -H file */
3908
3909 else
3910 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3911 {
3912 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3913 Uunlink(spool_name); /* Lose the data file */
3914
3915 if (smtp_input)
3916 {
3917 smtp_reply = US"451 Error in writing spool file";
3918 message_id[0] = 0; /* Indicate no message accepted */
3919 goto TIDYUP;
3920 }
3921 else
3922 {
3923 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3924 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3925 header_list);
3926 /* Does not return */
3927 }
3928 }
3929
3930
3931 /* The message has now been successfully received. */
3932
3933 receive_messagecount++;
3934
3935 /* Add data size to written header size. We do not count the initial file name
3936 that is in the file, but we do add one extra for the notional blank line that
3937 precedes the data. This total differs from message_size in that it include the
3938 added Received: header and any other headers that got created locally. */
3939
3940 if (fflush(spool_data_file))
3941 {
3942 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3943 log_write(0, LOG_MAIN, "%s\n", errmsg);
3944 Uunlink(spool_name); /* Lose the data file */
3945
3946 if (smtp_input)
3947 {
3948 smtp_reply = US"451 Error in writing spool file";
3949 message_id[0] = 0; /* Indicate no message accepted */
3950 goto TIDYUP;
3951 }
3952 else
3953 {
3954 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3955 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3956 header_list);
3957 /* Does not return */
3958 }
3959 }
3960 fstat(data_fd, &statbuf);
3961
3962 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3963
3964 /* Generate a "message received" log entry. We do this by building up a dynamic
3965 string as required. We log the arrival of a new message while the
3966 file is still locked, just in case the machine is *really* fast, and delivers
3967 it first! Include any message id that is in the message - since the syntax of a
3968 message id is actually an addr-spec, we can use the parse routine to canonicalize
3969 it. */
3970
3971 g = string_get(256);
3972
3973 g = string_append(g, 2,
3974 fake_response == FAIL ? US"(= " : US"<= ",
3975 sender_address[0] == 0 ? US"<>" : sender_address);
3976 if (message_reference)
3977 g = string_append(g, 2, US" R=", message_reference);
3978
3979 g = add_host_info_for_log(g);
3980
3981 #ifdef SUPPORT_TLS
3982 if (LOGGING(tls_cipher) && tls_in.cipher)
3983 g = string_append(g, 2, US" X=", tls_in.cipher);
3984 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3985 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3986 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3987 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3988 if (LOGGING(tls_sni) && tls_in.sni)
3989 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3990 #endif
3991
3992 if (sender_host_authenticated)
3993 {
3994 g = string_append(g, 2, US" A=", sender_host_authenticated);
3995 if (authenticated_id)
3996 {
3997 g = string_append(g, 2, US":", authenticated_id);
3998 if (LOGGING(smtp_mailauth) && authenticated_sender)
3999 g = string_append(g, 2, US":", authenticated_sender);
4000 }
4001 }
4002
4003 #ifndef DISABLE_PRDR
4004 if (prdr_requested)
4005 g = string_catn(g, US" PRDR", 5);
4006 #endif
4007
4008 #ifdef SUPPORT_PROXY
4009 if (proxy_session && LOGGING(proxy))
4010 g = string_append(g, 2, US" PRX=", proxy_local_address);
4011 #endif
4012
4013 if (chunking_state > CHUNKING_OFFERED)
4014 g = string_catn(g, US" K", 2);
4015
4016 sprintf(CS big_buffer, "%d", msg_size);
4017 g = string_append(g, 2, US" S=", big_buffer);
4018
4019 /* log 8BITMIME mode announced in MAIL_FROM
4020 0 ... no BODY= used
4021 7 ... 7BIT
4022 8 ... 8BITMIME */
4023 if (LOGGING(8bitmime))
4024 {
4025 sprintf(CS big_buffer, "%d", body_8bitmime);
4026 g = string_append(g, 2, US" M8S=", big_buffer);
4027 }
4028
4029 #ifndef DISABLE_DKIM
4030 if (LOGGING(dkim) && dkim_verify_overall)
4031 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4032 # ifdef EXPERIMENTAL_ARC
4033 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4034 g = string_catn(g, US" ARC", 4);
4035 # endif
4036 #endif
4037
4038 if (LOGGING(receive_time))
4039 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
4040
4041 if (*queue_name)
4042 g = string_append(g, 2, US" Q=", queue_name);
4043
4044 /* If an addr-spec in a message-id contains a quoted string, it can contain
4045 any characters except " \ and CR and so in particular it can contain NL!
4046 Therefore, make sure we use a printing-characters only version for the log.
4047 Also, allow for domain literals in the message id. */
4048
4049 if ( LOGGING(msg_id) && msgid_header
4050 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4051 )
4052 {
4053 uschar * old_id;
4054 BOOL save_allow_domain_literals = allow_domain_literals;
4055 allow_domain_literals = TRUE;
4056 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4057 &errmsg, &start, &end, &domain, FALSE);
4058 allow_domain_literals = save_allow_domain_literals;
4059 if (old_id)
4060 g = string_append(g, 2,
4061 msgid_header_newly_created ? US" id*=" : US" id=",
4062 string_printing(old_id));
4063 }
4064
4065 /* If subject logging is turned on, create suitable printing-character
4066 text. By expanding $h_subject: we make use of the MIME decoding. */
4067
4068 if (LOGGING(subject) && subject_header)
4069 {
4070 uschar *p = big_buffer;
4071 uschar *ss = expand_string(US"$h_subject:");
4072