f22816920da93f3bf72460add13cd48de066c06b
[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 SUPPORT_DMARC
18 # include "dmarc.h"
19 #endif
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);
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 + msg_size / 1024 < 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);
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), FALSE);
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 /*XXX we do a gettimeofday before checking for every received char,
649 which is hardly clever. The function-indirection doesn't help, but
650 an additional function to check for nonempty read buffer would help.
651 See stdin_getc() / smtp_getc() / tls_getc() / bdat_getc(). */
652
653 for ( ;
654 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
655 last_ch = ch)
656 {
657 if (ch == 0) body_zerocount++;
658 if (last_ch == '\r' && ch != '\n')
659 {
660 if (linelength > max_received_linelength)
661 max_received_linelength = linelength;
662 linelength = 0;
663 if (fputc('\n', fout) == EOF) return END_WERROR;
664 message_size++;
665 body_linecount++;
666 }
667 if (ch == '\r') continue;
668
669 if (fputc(ch, fout) == EOF) return END_WERROR;
670 if (ch == '\n')
671 {
672 if (linelength > max_received_linelength)
673 max_received_linelength = linelength;
674 linelength = 0;
675 body_linecount++;
676 }
677 else linelength++;
678 if (++message_size > thismessage_size_limit) return END_SIZE;
679 }
680
681 if (last_ch != '\n')
682 {
683 if (linelength > max_received_linelength)
684 max_received_linelength = linelength;
685 if (fputc('\n', fout) == EOF) return END_WERROR;
686 message_size++;
687 body_linecount++;
688 }
689
690 return END_EOF;
691 }
692
693 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
694
695 ch_state = 1;
696
697 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
698 {
699 if (ch == 0) body_zerocount++;
700 switch (ch_state)
701 {
702 case 0: /* Normal state (previous char written) */
703 if (ch == '\n')
704 {
705 body_linecount++;
706 if (linelength > max_received_linelength)
707 max_received_linelength = linelength;
708 linelength = -1;
709 ch_state = 1;
710 }
711 else if (ch == '\r')
712 { ch_state = 2; continue; }
713 break;
714
715 case 1: /* After written "\n" */
716 if (ch == '.') { ch_state = 3; continue; }
717 if (ch == '\r') { ch_state = 2; continue; }
718 if (ch == '\n') { body_linecount++; linelength = -1; }
719 else ch_state = 0;
720 break;
721
722 case 2:
723 body_linecount++; /* After unwritten "\r" */
724 if (linelength > max_received_linelength)
725 max_received_linelength = linelength;
726 if (ch == '\n')
727 {
728 ch_state = 1;
729 linelength = -1;
730 }
731 else
732 {
733 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
734 if (ch == '\r') continue;
735 ch_state = 0;
736 linelength = 0;
737 }
738 break;
739
740 case 3: /* After "\n." (\n written, dot not) */
741 if (ch == '\n') return END_DOT;
742 if (ch == '\r') { ch_state = 4; continue; }
743 message_size++;
744 linelength++;
745 if (fputc('.', fout) == EOF) return END_WERROR;
746 ch_state = 0;
747 break;
748
749 case 4: /* After "\n.\r" (\n written, rest not) */
750 if (ch == '\n') return END_DOT;
751 message_size += 2;
752 body_linecount++;
753 if (fputs(".\n", fout) == EOF) return END_WERROR;
754 if (ch == '\r') { ch_state = 2; continue; }
755 ch_state = 0;
756 break;
757 }
758
759 linelength++;
760 if (fputc(ch, fout) == EOF) return END_WERROR;
761 if (++message_size > thismessage_size_limit) return END_SIZE;
762 }
763
764 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
765 the message ends with a newline, and we must also write any characters that
766 were saved up while testing for an ending dot. */
767
768 if (ch_state != 1)
769 {
770 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
771 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
772 message_size += Ustrlen(ends[ch_state]);
773 body_linecount++;
774 }
775
776 return END_EOF;
777 }
778
779
780
781
782 /*************************************************
783 * Read data portion of an SMTP message *
784 *************************************************/
785
786 /* This function is called to read the remainder of an SMTP message (after the
787 headers), or to skip over it when an error has occurred. In this case, the
788 output file is passed as NULL.
789
790 If any line begins with a dot, that character is skipped. The input should only
791 be successfully terminated by CR LF . CR LF unless it is local (non-network)
792 SMTP, in which case the CRs are optional, but...
793
794 FUDGE: It seems that sites on the net send out messages with just LF
795 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
796 we make the CRs optional in all cases.
797
798 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
799 well, so that there are no CRs in spooled messages. However, the message
800 terminating dot is not recognized between two bare CRs.
801
802 Arguments:
803 fout a FILE to which to write the message; NULL if skipping
804
805 Returns: One of the END_xxx values indicating why it stopped reading
806 */
807
808 static int
809 read_message_data_smtp(FILE *fout)
810 {
811 int ch_state = 0;
812 int ch;
813 int linelength = 0;
814
815 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
816 {
817 if (ch == 0) body_zerocount++;
818 switch (ch_state)
819 {
820 case 0: /* After LF or CRLF */
821 if (ch == '.')
822 {
823 ch_state = 3;
824 continue; /* Don't ever write . after LF */
825 }
826 ch_state = 1;
827
828 /* Else fall through to handle as normal uschar. */
829
830 case 1: /* Normal state */
831 if (ch == '\n')
832 {
833 ch_state = 0;
834 body_linecount++;
835 if (linelength > max_received_linelength)
836 max_received_linelength = linelength;
837 linelength = -1;
838 }
839 else if (ch == '\r')
840 {
841 ch_state = 2;
842 continue;
843 }
844 break;
845
846 case 2: /* After (unwritten) CR */
847 body_linecount++;
848 if (linelength > max_received_linelength)
849 max_received_linelength = linelength;
850 linelength = -1;
851 if (ch == '\n')
852 {
853 ch_state = 0;
854 }
855 else
856 {
857 message_size++;
858 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
859 cutthrough_data_put_nl();
860 if (ch != '\r') ch_state = 1; else continue;
861 }
862 break;
863
864 case 3: /* After [CR] LF . */
865 if (ch == '\n')
866 return END_DOT;
867 if (ch == '\r')
868 {
869 ch_state = 4;
870 continue;
871 }
872 /* The dot was removed at state 3. For a doubled dot, here, reinstate
873 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
874 and to file below. */
875 if (ch == '.')
876 {
877 uschar c= ch;
878 cutthrough_data_puts(&c, 1);
879 }
880 ch_state = 1;
881 break;
882
883 case 4: /* After [CR] LF . CR */
884 if (ch == '\n') return END_DOT;
885 message_size++;
886 body_linecount++;
887 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
888 cutthrough_data_put_nl();
889 if (ch == '\r')
890 {
891 ch_state = 2;
892 continue;
893 }
894 ch_state = 1;
895 break;
896 }
897
898 /* Add the character to the spool file, unless skipping; then loop for the
899 next. */
900
901 message_size++;
902 linelength++;
903 if (fout)
904 {
905 if (fputc(ch, fout) == EOF) return END_WERROR;
906 if (message_size > thismessage_size_limit) return END_SIZE;
907 }
908 if(ch == '\n')
909 cutthrough_data_put_nl();
910 else
911 {
912 uschar c = ch;
913 cutthrough_data_puts(&c, 1);
914 }
915 }
916
917 /* Fall through here if EOF encountered. This indicates some kind of error,
918 since a correct message is terminated by [CR] LF . [CR] LF. */
919
920 return END_EOF;
921 }
922
923
924
925
926 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
927 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
928 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
929 body_linecount accounting for proper re-expansion for the wire, so use
930 a cut-down version of the state-machine above; we don't need to do leading-dot
931 detection and unstuffing.
932
933 Arguments:
934 fout a FILE to which to write the message; NULL if skipping;
935 must be open for both writing and reading.
936
937 Returns: One of the END_xxx values indicating why it stopped reading
938 */
939
940 static int
941 read_message_bdat_smtp(FILE *fout)
942 {
943 int linelength = 0, ch;
944 enum CH_STATE ch_state = LF_SEEN;
945 BOOL fix_nl = FALSE;
946
947 for(;;)
948 {
949 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
950 {
951 case EOF: return END_EOF;
952 case ERR: return END_PROTOCOL;
953 case EOD:
954 /* Nothing to get from the sender anymore. We check the last
955 character written to the spool.
956
957 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
958 If we would be strict, we would refuse such broken messages.
959 But we are liberal, so we fix it. It would be easy just to append
960 the "\n" to the spool.
961
962 But there are some more things (line counting, message size calculation and such),
963 that would need to be duplicated here. So we simply do some ungetc
964 trickery.
965 */
966 if (fout)
967 {
968 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
969 if (fgetc(fout) == '\n') return END_DOT;
970 }
971
972 if (linelength == -1) /* \r already seen (see below) */
973 {
974 DEBUG(D_receive) debug_printf("Add missing LF\n");
975 bdat_ungetc('\n');
976 continue;
977 }
978 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
979 bdat_ungetc('\r'); /* not even \r was seen */
980 fix_nl = TRUE;
981
982 continue;
983 case '\0': body_zerocount++; break;
984 }
985 switch (ch_state)
986 {
987 case LF_SEEN: /* After LF or CRLF */
988 ch_state = MID_LINE;
989 /* fall through to handle as normal uschar. */
990
991 case MID_LINE: /* Mid-line state */
992 if (ch == '\n')
993 {
994 ch_state = LF_SEEN;
995 body_linecount++;
996 if (linelength > max_received_linelength)
997 max_received_linelength = linelength;
998 linelength = -1;
999 }
1000 else if (ch == '\r')
1001 {
1002 ch_state = CR_SEEN;
1003 if (fix_nl) bdat_ungetc('\n');
1004 continue; /* don't write CR */
1005 }
1006 break;
1007
1008 case CR_SEEN: /* After (unwritten) CR */
1009 body_linecount++;
1010 if (linelength > max_received_linelength)
1011 max_received_linelength = linelength;
1012 linelength = -1;
1013 if (ch == '\n')
1014 ch_state = LF_SEEN;
1015 else
1016 {
1017 message_size++;
1018 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1019 cutthrough_data_put_nl();
1020 if (ch == '\r') continue; /* don't write CR */
1021 ch_state = MID_LINE;
1022 }
1023 break;
1024 }
1025
1026 /* Add the character to the spool file, unless skipping */
1027
1028 message_size++;
1029 linelength++;
1030 if (fout)
1031 {
1032 if (fputc(ch, fout) == EOF) return END_WERROR;
1033 if (message_size > thismessage_size_limit) return END_SIZE;
1034 }
1035 if(ch == '\n')
1036 cutthrough_data_put_nl();
1037 else
1038 {
1039 uschar c = ch;
1040 cutthrough_data_puts(&c, 1);
1041 }
1042 }
1043 /*NOTREACHED*/
1044 }
1045
1046 static int
1047 read_message_bdat_smtp_wire(FILE *fout)
1048 {
1049 int ch;
1050
1051 /* Remember that this message uses wireformat. */
1052
1053 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1054 fout ? "writing spoolfile in wire format" : "flushing input");
1055 f.spool_file_wireformat = TRUE;
1056
1057 for (;;)
1058 {
1059 if (chunking_data_left > 0)
1060 {
1061 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1062 uschar * buf = bdat_getbuf(&len);
1063
1064 if (!buf) return END_EOF;
1065 message_size += len;
1066 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1067 }
1068 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1069 {
1070 case EOF: return END_EOF;
1071 case EOD: return END_DOT;
1072 case ERR: return END_PROTOCOL;
1073
1074 default:
1075 message_size++;
1076 /*XXX not done:
1077 linelength
1078 max_received_linelength
1079 body_linecount
1080 body_zerocount
1081 */
1082 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1083 break;
1084 }
1085 if (message_size > thismessage_size_limit) return END_SIZE;
1086 }
1087 /*NOTREACHED*/
1088 }
1089
1090
1091
1092
1093 /*************************************************
1094 * Swallow SMTP message *
1095 *************************************************/
1096
1097 /* This function is called when there has been some kind of error while reading
1098 an SMTP message, and the remaining data may need to be swallowed. It is global
1099 because it is called from smtp_closedown() to shut down an incoming call
1100 tidily.
1101
1102 Argument: a FILE from which to read the message
1103 Returns: nothing
1104 */
1105
1106 void
1107 receive_swallow_smtp(void)
1108 {
1109 if (message_ended >= END_NOTENDED)
1110 message_ended = chunking_state <= CHUNKING_OFFERED
1111 ? read_message_data_smtp(NULL)
1112 : read_message_bdat_smtp_wire(NULL);
1113 }
1114
1115
1116
1117 /*************************************************
1118 * Handle lost SMTP connection *
1119 *************************************************/
1120
1121 /* This function logs connection loss incidents and generates an appropriate
1122 SMTP response.
1123
1124 Argument: additional data for the message
1125 Returns: the SMTP response
1126 */
1127
1128 static uschar *
1129 handle_lost_connection(uschar *s)
1130 {
1131 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1132 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1133 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1134 return US"421 Lost incoming connection";
1135 }
1136
1137
1138
1139
1140 /*************************************************
1141 * Handle a non-smtp reception error *
1142 *************************************************/
1143
1144 /* This function is called for various errors during the reception of non-SMTP
1145 messages. It either sends a message to the sender of the problem message, or it
1146 writes to the standard error stream.
1147
1148 Arguments:
1149 errcode code for moan_to_sender(), identifying the error
1150 text1 first message text, passed to moan_to_sender()
1151 text2 second message text, used only for stderrr
1152 error_rc code to pass to exim_exit if no problem
1153 f FILE containing body of message (may be stdin)
1154 hptr pointer to instore headers or NULL
1155
1156 Returns: calls exim_exit(), which does not return
1157 */
1158
1159 static void
1160 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1161 FILE *f, header_line *hptr)
1162 {
1163 if (error_handling == ERRORS_SENDER)
1164 {
1165 error_block eblock;
1166 eblock.next = NULL;
1167 eblock.text1 = text1;
1168 eblock.text2 = US"";
1169 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1170 error_rc = EXIT_FAILURE;
1171 }
1172 else
1173 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1174 (void)fclose(f);
1175 exim_exit(error_rc);
1176 }
1177
1178
1179
1180 /*************************************************
1181 * Add header lines set up by ACL *
1182 *************************************************/
1183
1184 /* This function is called to add the header lines that were set up by
1185 statements in an ACL to the list of headers in memory. It is done in two stages
1186 like this, because when the ACL for RCPT is running, the other headers have not
1187 yet been received. This function is called twice; once just before running the
1188 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1189 are visible to the DATA ACL.
1190
1191 Originally these header lines were added at the end. Now there is support for
1192 three different places: top, bottom, and after the Received: header(s). There
1193 will always be at least one Received: header, even if it is marked deleted, and
1194 even if something else has been put in front of it.
1195
1196 Arguments:
1197 acl_name text to identify which ACL
1198
1199 Returns: nothing
1200 */
1201
1202 static void
1203 add_acl_headers(int where, uschar *acl_name)
1204 {
1205 header_line *last_received = NULL;
1206
1207 switch(where)
1208 {
1209 case ACL_WHERE_DKIM:
1210 case ACL_WHERE_MIME:
1211 case ACL_WHERE_DATA:
1212 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1213 && (acl_removed_headers || acl_added_headers))
1214 {
1215 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1216 " will not take effect on cutthrough deliveries");
1217 return;
1218 }
1219 }
1220
1221 if (acl_removed_headers)
1222 {
1223 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1224
1225 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1226 {
1227 const uschar * list = acl_removed_headers;
1228 int sep = ':'; /* This is specified as a colon-separated list */
1229 uschar *s;
1230 uschar buffer[128];
1231
1232 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1233 if (header_testname(h, s, Ustrlen(s), FALSE))
1234 {
1235 h->type = htype_old;
1236 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1237 }
1238 }
1239 acl_removed_headers = NULL;
1240 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1241 }
1242
1243 if (!acl_added_headers) return;
1244 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1245
1246 for (header_line * h = acl_added_headers, * next; h; h = next)
1247 {
1248 next = h->next;
1249
1250 switch(h->type)
1251 {
1252 case htype_add_top:
1253 h->next = header_list;
1254 header_list = h;
1255 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1256 break;
1257
1258 case htype_add_rec:
1259 if (!last_received)
1260 {
1261 last_received = header_list;
1262 while (!header_testname(last_received, US"Received", 8, FALSE))
1263 last_received = last_received->next;
1264 while (last_received->next &&
1265 header_testname(last_received->next, US"Received", 8, FALSE))
1266 last_received = last_received->next;
1267 }
1268 h->next = last_received->next;
1269 last_received->next = h;
1270 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1271 break;
1272
1273 case htype_add_rfc:
1274 /* add header before any header which is NOT Received: or Resent- */
1275 last_received = header_list;
1276 while ( last_received->next &&
1277 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1278 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1279 last_received = last_received->next;
1280 /* last_received now points to the last Received: or Resent-* header
1281 in an uninterrupted chain of those header types (seen from the beginning
1282 of all headers. Our current header must follow it. */
1283 h->next = last_received->next;
1284 last_received->next = h;
1285 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1286 break;
1287
1288 default:
1289 h->next = NULL;
1290 header_last->next = h;
1291 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1292 break;
1293 }
1294
1295 if (!h->next) header_last = h;
1296
1297 /* Check for one of the known header types (From:, To:, etc.) though in
1298 practice most added headers are going to be "other". Lower case
1299 identification letters are never stored with the header; they are used
1300 for existence tests when messages are received. So discard any lower case
1301 flag values. */
1302
1303 h->type = header_checkname(h, FALSE);
1304 if (h->type >= 'a') h->type = htype_other;
1305
1306 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1307 }
1308
1309 acl_added_headers = NULL;
1310 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1311 }
1312
1313
1314
1315 /*************************************************
1316 * Add host information for log line *
1317 *************************************************/
1318
1319 /* Called for acceptance and rejecting log lines. This adds information about
1320 the calling host to a string that is being built dynamically.
1321
1322 Arguments:
1323 s the dynamic string
1324
1325 Returns: the extended string
1326 */
1327
1328 static gstring *
1329 add_host_info_for_log(gstring * g)
1330 {
1331 if (sender_fullhost)
1332 {
1333 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1334 g = string_catn(g, US" DS", 3);
1335 g = string_append(g, 2, US" H=", sender_fullhost);
1336 if (LOGGING(incoming_interface) && interface_address)
1337 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1338 }
1339 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1340 {
1341 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1342 f.tcp_in_fastopen_logged = TRUE;
1343 }
1344 if (sender_ident)
1345 g = string_append(g, 2, US" U=", sender_ident);
1346 if (received_protocol)
1347 g = string_append(g, 2, US" P=", received_protocol);
1348 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1349 {
1350 g = string_catn(g, US" L", 2);
1351 #ifndef DISABLE_PIPE_CONNECT
1352 if (f.smtp_in_early_pipe_used)
1353 g = string_catn(g, US"*", 1);
1354 else if (f.smtp_in_early_pipe_advertised)
1355 g = string_catn(g, US".", 1);
1356 #endif
1357 if (!f.smtp_in_pipelining_used)
1358 g = string_catn(g, US"-", 1);
1359 }
1360 return g;
1361 }
1362
1363
1364
1365 #ifdef WITH_CONTENT_SCAN
1366
1367 /*************************************************
1368 * Run the MIME ACL on a message *
1369 *************************************************/
1370
1371 /* This code is in a subroutine so that it can be used for both SMTP
1372 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1373
1374 Arguments:
1375 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1376 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1377 smtp_reply_ptr Where SMTP reply is being built
1378 blackholed_by_ptr Where "blackholed by" message is being built
1379
1380 Returns: TRUE to carry on; FALSE to abandon the message
1381 */
1382
1383 static BOOL
1384 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1385 uschar **blackholed_by_ptr)
1386 {
1387 FILE *mbox_file;
1388 uschar * rfc822_file_path = NULL;
1389 unsigned long mbox_size;
1390 uschar *user_msg, *log_msg;
1391 int mime_part_count_buffer = -1;
1392 uschar * mbox_filename;
1393 int rc = OK;
1394
1395 /* check if it is a MIME message */
1396
1397 for (header_line * my_headerlist = header_list; my_headerlist;
1398 my_headerlist = my_headerlist->next)
1399 if ( my_headerlist->type != '*' /* skip deleted headers */
1400 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1401 )
1402 {
1403 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1404 goto DO_MIME_ACL;
1405 }
1406
1407 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1408 return TRUE;
1409
1410 DO_MIME_ACL:
1411
1412 /* make sure the eml mbox file is spooled up */
1413 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1414 { /* error while spooling */
1415 log_write(0, LOG_MAIN|LOG_PANIC,
1416 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1417 Uunlink(spool_name);
1418 unspool_mbox();
1419 #ifdef EXPERIMENTAL_DCC
1420 dcc_ok = 0;
1421 #endif
1422 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1423 message_id[0] = 0; /* Indicate no message accepted */
1424 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1425 return FALSE; /* Indicate skip to end of receive function */
1426 }
1427
1428 mime_is_rfc822 = 0;
1429
1430 MIME_ACL_CHECK:
1431 mime_part_count = -1;
1432 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1433 (void)fclose(mbox_file);
1434
1435 if (rfc822_file_path)
1436 {
1437 mime_part_count = mime_part_count_buffer;
1438
1439 if (unlink(CS rfc822_file_path) == -1)
1440 {
1441 log_write(0, LOG_PANIC,
1442 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1443 goto END_MIME_ACL;
1444 }
1445 rfc822_file_path = NULL;
1446 }
1447
1448 /* check if we must check any message/rfc822 attachments */
1449 if (rc == OK)
1450 {
1451 uschar * scandir = string_copyn(mbox_filename,
1452 Ustrrchr(mbox_filename, '/') - mbox_filename);
1453 struct dirent * entry;
1454 DIR * tempdir;
1455
1456 for (tempdir = exim_opendir(scandir); entry = readdir(tempdir); )
1457 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1458 {
1459 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1460 DEBUG(D_receive)
1461 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1462 rfc822_file_path);
1463 break;
1464 }
1465 closedir(tempdir);
1466
1467 if (rfc822_file_path)
1468 {
1469 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1470 {
1471 /* set RFC822 expansion variable */
1472 mime_is_rfc822 = 1;
1473 mime_part_count_buffer = mime_part_count;
1474 goto MIME_ACL_CHECK;
1475 }
1476 log_write(0, LOG_PANIC,
1477 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1478 unlink(CS rfc822_file_path);
1479 }
1480 }
1481
1482 END_MIME_ACL:
1483 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1484 if (rc == DISCARD)
1485 {
1486 recipients_count = 0;
1487 *blackholed_by_ptr = US"MIME ACL";
1488 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1489 }
1490 else if (rc != OK)
1491 {
1492 Uunlink(spool_name);
1493 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1494 unspool_mbox();
1495 #ifdef EXPERIMENTAL_DCC
1496 dcc_ok = 0;
1497 #endif
1498 if (smtp_input)
1499 {
1500 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1501 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1502 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1503 }
1504 message_id[0] = 0; /* Indicate no message accepted */
1505 return FALSE; /* Cause skip to end of receive function */
1506 }
1507
1508 return TRUE;
1509 }
1510
1511 #endif /* WITH_CONTENT_SCAN */
1512
1513
1514
1515 void
1516 received_header_gen(void)
1517 {
1518 uschar *received;
1519 uschar *timestamp;
1520 header_line *received_header= header_list;
1521
1522 timestamp = expand_string(US"${tod_full}");
1523 if (recipients_count == 1) received_for = recipients_list[0].address;
1524 received = expand_string(received_header_text);
1525 received_for = NULL;
1526
1527 if (!received)
1528 {
1529 if(spool_name[0] != 0)
1530 Uunlink(spool_name); /* Lose the data file */
1531 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1532 "(received_header_text) failed: %s", string_printing(received_header_text),
1533 expand_string_message);
1534 }
1535
1536 /* The first element on the header chain is reserved for the Received header,
1537 so all we have to do is fill in the text pointer, and set the type. However, if
1538 the result of the expansion is an empty string, we leave the header marked as
1539 "old" so as to refrain from adding a Received header. */
1540
1541 if (received[0] == 0)
1542 {
1543 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1544 received_header->type = htype_old;
1545 }
1546 else
1547 {
1548 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1549 received_header->type = htype_received;
1550 }
1551
1552 received_header->slen = Ustrlen(received_header->text);
1553
1554 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1555 received_header->type, received_header->text);
1556 }
1557
1558
1559
1560 /*************************************************
1561 * Receive message *
1562 *************************************************/
1563
1564 /* Receive a message on the given input, and put it into a pair of spool files.
1565 Either a non-null list of recipients, or the extract flag will be true, or
1566 both. The flag sender_local is true for locally generated messages. The flag
1567 submission_mode is true if an ACL has obeyed "control = submission". The flag
1568 suppress_local_fixups is true if an ACL has obeyed "control =
1569 suppress_local_fixups" or -G was passed on the command-line.
1570 The flag smtp_input is true if the message is to be
1571 handled using SMTP conventions about termination and lines starting with dots.
1572 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1573
1574 If a message was successfully read, message_id[0] will be non-zero.
1575
1576 The general actions of this function are:
1577
1578 . Read the headers of the message (if any) into a chain of store
1579 blocks.
1580
1581 . If there is a "sender:" header and the message is locally originated,
1582 throw it away, unless the caller is trusted, or unless
1583 active_local_sender_retain is set - which can only happen if
1584 active_local_from_check is false.
1585
1586 . If recipients are to be extracted from the message, build the
1587 recipients list from the headers, removing any that were on the
1588 original recipients list (unless extract_addresses_remove_arguments is
1589 false), and at the same time, remove any bcc header that may be present.
1590
1591 . Get the spool file for the data, sort out its unique name, open
1592 and lock it (but don't give it the name yet).
1593
1594 . Generate a "Message-Id" header if the message doesn't have one, for
1595 locally-originated messages.
1596
1597 . Generate a "Received" header.
1598
1599 . Ensure the recipients list is fully qualified and rewritten if necessary.
1600
1601 . If there are any rewriting rules, apply them to the sender address
1602 and also to the headers.
1603
1604 . If there is no from: header, generate one, for locally-generated messages
1605 and messages in "submission mode" only.
1606
1607 . If the sender is local, check that from: is correct, and if not, generate
1608 a Sender: header, unless message comes from a trusted caller, or this
1609 feature is disabled by active_local_from_check being false.
1610
1611 . If there is no "date" header, generate one, for locally-originated
1612 or submission mode messages only.
1613
1614 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1615 dot_ends mode, to the data file. Leave it open, to hold the lock.
1616
1617 . Write the envelope and the headers to a new file.
1618
1619 . Set the name for the header file; close it.
1620
1621 . Set the name for the data file; close it.
1622
1623 Because this function can potentially be called many times in a single
1624 SMTP connection, all store should be got by store_get(), so that it will be
1625 automatically retrieved after the message is accepted.
1626
1627 FUDGE: It seems that sites on the net send out messages with just LF
1628 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1629 we make the CRs optional in all cases.
1630
1631 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1632 new regime is now in place in which bare CRs in header lines are turned into LF
1633 followed by a space, so as not to terminate the header line.
1634
1635 February 2004: A bare LF in a header line in a message whose first line was
1636 terminated by CRLF is treated in the same way as a bare CR.
1637
1638 Arguments:
1639 extract_recip TRUE if recipients are to be extracted from the message's
1640 headers
1641
1642 Returns: TRUE there are more messages to be read (SMTP input)
1643 FALSE there are no more messages to be read (non-SMTP input
1644 or SMTP connection collapsed, or other failure)
1645
1646 When reading a message for filter testing, the returned value indicates
1647 whether the headers (which is all that is read) were terminated by '.' or
1648 not. */
1649
1650 BOOL
1651 receive_msg(BOOL extract_recip)
1652 {
1653 int rc = FAIL;
1654 int msg_size = 0;
1655 int process_info_len = Ustrlen(process_info);
1656 int error_rc = error_handling == ERRORS_SENDER
1657 ? errors_sender_rc : EXIT_FAILURE;
1658 int header_size = 256;
1659 int start, end, domain;
1660 int id_resolution = 0;
1661 int had_zero = 0;
1662 int prevlines_length = 0;
1663
1664 int ptr = 0;
1665
1666 BOOL contains_resent_headers = FALSE;
1667 BOOL extracted_ignored = FALSE;
1668 BOOL first_line_ended_crlf = TRUE_UNSET;
1669 BOOL smtp_yield = TRUE;
1670 BOOL yield = FALSE;
1671
1672 BOOL resents_exist = FALSE;
1673 uschar *resent_prefix = US"";
1674 uschar *blackholed_by = NULL;
1675 uschar *blackhole_log_msg = US"";
1676 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1677
1678 flock_t lock_data;
1679 error_block *bad_addresses = NULL;
1680
1681 uschar *frozen_by = NULL;
1682 uschar *queued_by = NULL;
1683
1684 uschar *errmsg;
1685 rmark rcvd_log_reset_point;
1686 gstring * g;
1687 struct stat statbuf;
1688
1689 /* Final message to give to SMTP caller, and messages from ACLs */
1690
1691 uschar *smtp_reply = NULL;
1692 uschar *user_msg, *log_msg;
1693
1694 /* Working header pointers */
1695
1696 rmark reset_point;
1697 header_line *next;
1698
1699 /* Flags for noting the existence of certain headers (only one left) */
1700
1701 BOOL date_header_exists = FALSE;
1702
1703 /* Pointers to receive the addresses of headers whose contents we need. */
1704
1705 header_line *from_header = NULL;
1706 header_line *subject_header = NULL;
1707 header_line *msgid_header = NULL;
1708 header_line *received_header;
1709 BOOL msgid_header_newly_created = FALSE;
1710
1711 /* Variables for use when building the Received: header. */
1712
1713 uschar *timestamp;
1714 int tslen;
1715
1716
1717 /* Release any open files that might have been cached while preparing to
1718 accept the message - e.g. by verifying addresses - because reading a message
1719 might take a fair bit of real time. */
1720
1721 search_tidyup();
1722
1723 /* Extracting the recipient list from an input file is incompatible with
1724 cutthrough delivery with the no-spool option. It shouldn't be possible
1725 to set up the combination, but just in case kill any ongoing connection. */
1726 if (extract_recip || !smtp_input)
1727 cancel_cutthrough_connection(TRUE, US"not smtp input");
1728
1729 /* Initialize the chain of headers by setting up a place-holder for Received:
1730 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1731 pointing to the end of the chain to make adding headers simple. */
1732
1733 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1734 header_list->next = NULL;
1735 header_list->type = htype_old;
1736 header_list->text = NULL;
1737 header_list->slen = 0;
1738
1739 /* Control block for the next header to be read. */
1740
1741 reset_point = store_mark();
1742 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1743 next->text = store_get(header_size, TRUE); /* tainted */
1744
1745 /* Initialize message id to be null (indicating no message read), and the
1746 header names list to be the normal list. Indicate there is no data file open
1747 yet, initialize the size and warning count, and deal with no size limit. */
1748
1749 message_id[0] = 0;
1750 spool_data_file = NULL;
1751 data_fd = -1;
1752 spool_name = US"";
1753 message_size = 0;
1754 warning_count = 0;
1755 received_count = 1; /* For the one we will add */
1756
1757 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1758
1759 /* While reading the message, the following counts are computed. */
1760
1761 message_linecount = body_linecount = body_zerocount =
1762 max_received_linelength = 0;
1763
1764 #ifdef WITH_CONTENT_SCAN
1765 /* reset non-per-part mime variables */
1766 mime_is_coverletter = 0;
1767 mime_is_rfc822 = 0;
1768 mime_part_count = -1;
1769 #endif
1770
1771 #ifndef DISABLE_DKIM
1772 /* Call into DKIM to set up the context. In CHUNKING mode
1773 we clear the dot-stuffing flag */
1774 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1775 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1776 #endif
1777
1778 #ifdef SUPPORT_DMARC
1779 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1780 #endif
1781
1782 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1783 ids, and fractions of a second are required. See the comments that precede the
1784 message id creation below. */
1785
1786 (void)gettimeofday(&message_id_tv, NULL);
1787
1788 /* For other uses of the received time we can operate with granularity of one
1789 second, and for that we use the global variable received_time. This is for
1790 things like ultimate message timeouts. */
1791
1792 received_time = message_id_tv;
1793
1794 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1795 happen in the smtp_getc() function when it refills its buffer. */
1796
1797 had_data_timeout = 0;
1798 if (smtp_input)
1799 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1800
1801 /* If not SMTP input, timeout happens only if configured, and we just set a
1802 single timeout for the whole message. */
1803
1804 else if (receive_timeout > 0)
1805 {
1806 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1807 ALARM(receive_timeout);
1808 }
1809
1810 /* SIGTERM and SIGINT are caught always. */
1811
1812 had_data_sigint = 0;
1813 signal(SIGTERM, data_sigterm_sigint_handler);
1814 signal(SIGINT, data_sigterm_sigint_handler);
1815
1816 /* Header lines in messages are not supposed to be very long, though when
1817 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1818 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1819 storing the header, and extend this as necessary using string_cat().
1820
1821 To cope with total lunacies, impose an upper limit on the length of the header
1822 section of the message, as otherwise the store will fill up. We must also cope
1823 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1824 Folded header lines are joined into one string, leaving the '\n' characters
1825 inside them, so that writing them out reproduces the input.
1826
1827 Loop for each character of each header; the next structure for chaining the
1828 header is set up already, with ptr the offset of the next character in
1829 next->text. */
1830
1831 for (;;)
1832 {
1833 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1834
1835 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1836 SMTP must have a correct "." terminator. */
1837
1838 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1839 {
1840 smtp_reply = handle_lost_connection(US" (header)");
1841 smtp_yield = FALSE;
1842 goto TIDYUP; /* Skip to end of function */
1843 }
1844
1845 /* See if we are at the current header's size limit - there must be at least
1846 four bytes left. This allows for the new character plus a zero, plus two for
1847 extra insertions when we are playing games with dots and carriage returns. If
1848 we are at the limit, extend the text buffer. This could have been done
1849 automatically using string_cat() but because this is a tightish loop storing
1850 only one character at a time, we choose to do it inline. Normally
1851 store_extend() will be able to extend the block; only at the end of a big
1852 store block will a copy be needed. To handle the case of very long headers
1853 (and sometimes lunatic messages can have ones that are 100s of K long) we
1854 call store_release() for strings that have been copied - if the string is at
1855 the start of a block (and therefore the only thing in it, because we aren't
1856 doing any other gets), the block gets freed. We can only do this release if
1857 there were no allocations since the once that we want to free. */
1858
1859 if (ptr >= header_size - 4)
1860 {
1861 int oldsize = header_size;
1862
1863 if (header_size >= INT_MAX/2)
1864 goto OVERSIZE;
1865 header_size *= 2;
1866
1867 /* The data came from the message, so is tainted. */
1868
1869 if (!store_extend(next->text, TRUE, oldsize, header_size))
1870 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1871 }
1872
1873 /* Cope with receiving a binary zero. There is dispute about whether
1874 these should be allowed in RFC 822 messages. The middle view is that they
1875 should not be allowed in headers, at least. Exim takes this attitude at
1876 the moment. We can't just stomp on them here, because we don't know that
1877 this line is a header yet. Set a flag to cause scanning later. */
1878
1879 if (ch == 0) had_zero++;
1880
1881 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1882 those from data files use just LF. Treat LF in local SMTP input as a
1883 terminator too. Treat EOF as a line terminator always. */
1884
1885 if (ch == EOF) goto EOL;
1886
1887 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1888 other MTAs accept this. We are therefore forced into this "liberalisation"
1889 too, so we accept LF as a line terminator whatever the source of the message.
1890 However, if the first line of the message ended with a CRLF, we treat a bare
1891 LF specially by inserting a white space after it to ensure that the header
1892 line is not terminated. */
1893
1894 if (ch == '\n')
1895 {
1896 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1897 else if (first_line_ended_crlf) receive_ungetc(' ');
1898 goto EOL;
1899 }
1900
1901 /* This is not the end of the line. If this is SMTP input and this is
1902 the first character in the line and it is a "." character, ignore it.
1903 This implements the dot-doubling rule, though header lines starting with
1904 dots aren't exactly common. They are legal in RFC 822, though. If the
1905 following is CRLF or LF, this is the line that that terminates the
1906 entire message. We set message_ended to indicate this has happened (to
1907 prevent further reading), and break out of the loop, having freed the
1908 empty header, and set next = NULL to indicate no data line. */
1909
1910 if (ptr == 0 && ch == '.' && f.dot_ends)
1911 {
1912 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1913 if (ch == '\r')
1914 {
1915 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1916 if (ch != '\n')
1917 {
1918 receive_ungetc(ch);
1919 ch = '\r'; /* Revert to CR */
1920 }
1921 }
1922 if (ch == '\n')
1923 {
1924 message_ended = END_DOT;
1925 reset_point = store_reset(reset_point);
1926 next = NULL;
1927 break; /* End character-reading loop */
1928 }
1929
1930 /* For non-SMTP input, the dot at the start of the line was really a data
1931 character. What is now in ch is the following character. We guaranteed
1932 enough space for this above. */
1933
1934 if (!smtp_input)
1935 {
1936 next->text[ptr++] = '.';
1937 message_size++;
1938 }
1939 }
1940
1941 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1942 remember this case if this is the first line ending. */
1943
1944 if (ch == '\r')
1945 {
1946 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1947 if (ch == '\n')
1948 {
1949 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1950 goto EOL;
1951 }
1952
1953 /* Otherwise, put back the character after CR, and turn the bare CR
1954 into LF SP. */
1955
1956 ch = (receive_ungetc)(ch);
1957 next->text[ptr++] = '\n';
1958 message_size++;
1959 ch = ' ';
1960 }
1961
1962 /* We have a data character for the header line. */
1963
1964 next->text[ptr++] = ch; /* Add to buffer */
1965 message_size++; /* Total message size so far */
1966
1967 /* Handle failure due to a humungously long header section. The >= allows
1968 for the terminating \n. Add what we have so far onto the headers list so
1969 that it gets reflected in any error message, and back up the just-read
1970 character. */
1971
1972 if (message_size >= header_maxsize)
1973 {
1974 OVERSIZE:
1975 next->text[ptr] = 0;
1976 next->slen = ptr;
1977 next->type = htype_other;
1978 next->next = NULL;
1979 header_last->next = next;
1980 header_last = next;
1981
1982 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1983 "%s (more than %d characters): message abandoned",
1984 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1985
1986 if (smtp_input)
1987 {
1988 smtp_reply = US"552 Message header is ridiculously long";
1989 receive_swallow_smtp();
1990 goto TIDYUP; /* Skip to end of function */
1991 }
1992
1993 else
1994 {
1995 give_local_error(ERRMESS_VLONGHEADER,
1996 string_sprintf("message header longer than %d characters received: "
1997 "message not accepted", header_maxsize), US"", error_rc, stdin,
1998 header_list->next);
1999 /* Does not return */
2000 }
2001 }
2002
2003 continue; /* With next input character */
2004
2005 /* End of header line reached */
2006
2007 EOL:
2008
2009 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2010
2011 receive_linecount++;
2012 message_linecount++;
2013
2014 /* Keep track of maximum line length */
2015
2016 if (ptr - prevlines_length > max_received_linelength)
2017 max_received_linelength = ptr - prevlines_length;
2018 prevlines_length = ptr + 1;
2019
2020 /* Now put in the terminating newline. There is always space for
2021 at least two more characters. */
2022
2023 next->text[ptr++] = '\n';
2024 message_size++;
2025
2026 /* A blank line signals the end of the headers; release the unwanted
2027 space and set next to NULL to indicate this. */
2028
2029 if (ptr == 1)
2030 {
2031 reset_point = store_reset(reset_point);
2032 next = NULL;
2033 break;
2034 }
2035
2036 /* There is data in the line; see if the next input character is a
2037 whitespace character. If it is, we have a continuation of this header line.
2038 There is always space for at least one character at this point. */
2039
2040 if (ch != EOF)
2041 {
2042 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2043 if (nextch == ' ' || nextch == '\t')
2044 {
2045 next->text[ptr++] = nextch;
2046 if (++message_size >= header_maxsize)
2047 goto OVERSIZE;
2048 continue; /* Iterate the loop */
2049 }
2050 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2051 else ch = EOF; /* Cause main loop to exit at end */
2052 }
2053
2054 /* We have got to the real line end. Terminate the string and release store
2055 beyond it. If it turns out to be a real header, internal binary zeros will
2056 be squashed later. */
2057
2058 next->text[ptr] = 0;
2059 next->slen = ptr;
2060 store_release_above(next->text + ptr + 1);
2061
2062 /* Check the running total size against the overall message size limit. We
2063 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2064 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2065 headers - the code to read the body will then also hit the buffer. */
2066
2067 if (message_size > thismessage_size_limit) break;
2068
2069 /* A line that is not syntactically correct for a header also marks
2070 the end of the headers. In this case, we leave next containing the
2071 first data line. This might actually be several lines because of the
2072 continuation logic applied above, but that doesn't matter.
2073
2074 It turns out that smail, and presumably sendmail, accept leading lines
2075 of the form
2076
2077 From ph10 Fri Jan 5 12:35 GMT 1996
2078
2079 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2080 find any documentation of this, but for compatibility it had better be
2081 accepted. Exim restricts it to the case of non-smtp messages, and
2082 treats it as an alternative to the -f command line option. Thus it is
2083 ignored except for trusted users or filter testing. Otherwise it is taken
2084 as the sender address, unless -f was used (sendmail compatibility).
2085
2086 It further turns out that some UUCPs generate the From_line in a different
2087 format, e.g.
2088
2089 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2090
2091 The regex for matching these things is now capable of recognizing both
2092 formats (including 2- and 4-digit years in the latter). In fact, the regex
2093 is now configurable, as is the expansion string to fish out the sender.
2094
2095 Even further on it has been discovered that some broken clients send
2096 these lines in SMTP messages. There is now an option to ignore them from
2097 specified hosts or networks. Sigh. */
2098
2099 if ( header_last == header_list
2100 && ( !smtp_input
2101 || ( sender_host_address
2102 && verify_check_host(&ignore_fromline_hosts) == OK
2103 )
2104 || (!sender_host_address && ignore_fromline_local)
2105 )
2106 && regex_match_and_setup(regex_From, next->text, 0, -1)
2107 )
2108 {
2109 if (!f.sender_address_forced)
2110 {
2111 uschar *uucp_sender = expand_string(uucp_from_sender);
2112 if (!uucp_sender)
2113 log_write(0, LOG_MAIN|LOG_PANIC,
2114 "expansion of \"%s\" failed after matching "
2115 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2116 else
2117 {
2118 int start, end, domain;
2119 uschar *errmess;
2120 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2121 &start, &end, &domain, TRUE);
2122 if (newsender)
2123 {
2124 if (domain == 0 && newsender[0] != 0)
2125 newsender = rewrite_address_qualify(newsender, FALSE);
2126
2127 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2128 {
2129 sender_address = newsender;
2130
2131 if (f.trusted_caller || filter_test != FTEST_NONE)
2132 {
2133 authenticated_sender = NULL;
2134 originator_name = US"";
2135 f.sender_local = FALSE;
2136 }
2137
2138 if (filter_test != FTEST_NONE)
2139 printf("Sender taken from \"From \" line\n");
2140 }
2141 }
2142 }
2143 }
2144 }
2145
2146 /* Not a leading "From " line. Check to see if it is a valid header line.
2147 Header names may contain any non-control characters except space and colon,
2148 amazingly. */
2149
2150 else
2151 {
2152 uschar *p = next->text;
2153
2154 /* If not a valid header line, break from the header reading loop, leaving
2155 next != NULL, indicating that it holds the first line of the body. */
2156
2157 if (isspace(*p)) break;
2158 while (mac_isgraph(*p) && *p != ':') p++;
2159 while (isspace(*p)) p++;
2160 if (*p != ':')
2161 {
2162 body_zerocount = had_zero;
2163 break;
2164 }
2165
2166 /* We have a valid header line. If there were any binary zeroes in
2167 the line, stomp on them here. */
2168
2169 if (had_zero > 0)
2170 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2171 *p = '?';
2172
2173 /* It is perfectly legal to have an empty continuation line
2174 at the end of a header, but it is confusing to humans
2175 looking at such messages, since it looks like a blank line.
2176 Reduce confusion by removing redundant white space at the
2177 end. We know that there is at least one printing character
2178 (the ':' tested for above) so there is no danger of running
2179 off the end. */
2180
2181 p = next->text + ptr - 2;
2182 for (;;)
2183 {
2184 while (*p == ' ' || *p == '\t') p--;
2185 if (*p != '\n') break;
2186 ptr = (p--) - next->text + 1;
2187 message_size -= next->slen - ptr;
2188 next->text[ptr] = 0;
2189 next->slen = ptr;
2190 }
2191
2192 /* Add the header to the chain */
2193
2194 next->type = htype_other;
2195 next->next = NULL;
2196 header_last->next = next;
2197 header_last = next;
2198
2199 /* Check the limit for individual line lengths. This comes after adding to
2200 the chain so that the failing line is reflected if a bounce is generated
2201 (for a local message). */
2202
2203 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2204 {
2205 log_write(0, LOG_MAIN, "overlong message header line received from "
2206 "%s (more than %d characters): message abandoned",
2207 f.sender_host_unknown ? sender_ident : sender_fullhost,
2208 header_line_maxsize);
2209
2210 if (smtp_input)
2211 {
2212 smtp_reply = US"552 A message header line is too long";
2213 receive_swallow_smtp();
2214 goto TIDYUP; /* Skip to end of function */
2215 }
2216
2217 else
2218 give_local_error(ERRMESS_VLONGHDRLINE,
2219 string_sprintf("message header line longer than %d characters "
2220 "received: message not accepted", header_line_maxsize), US"",
2221 error_rc, stdin, header_list->next);
2222 /* Does not return */
2223 }
2224
2225 /* Note if any resent- fields exist. */
2226
2227 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2228 {
2229 resents_exist = TRUE;
2230 resent_prefix = US"Resent-";
2231 }
2232 }
2233
2234 /* Reject CHUNKING messages that do not CRLF their first header line */
2235
2236 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2237 {
2238 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2239 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2240 sender_address,
2241 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2242 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2243 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2244 bdat_flush_data();
2245 smtp_reply = US"";
2246 goto TIDYUP; /* Skip to end of function */
2247 }
2248
2249 /* The line has been handled. If we have hit EOF, break out of the loop,
2250 indicating no pending data line. */
2251
2252 if (ch == EOF) { next = NULL; break; }
2253
2254 /* Set up for the next header */
2255
2256 reset_point = store_mark();
2257 header_size = 256;
2258 next = store_get(sizeof(header_line), FALSE);
2259 next->text = store_get(header_size, TRUE);
2260 ptr = 0;
2261 had_zero = 0;
2262 prevlines_length = 0;
2263 } /* Continue, starting to read the next header */
2264
2265 /* At this point, we have read all the headers into a data structure in main
2266 store. The first header is still the dummy placeholder for the Received: header
2267 we are going to generate a bit later on. If next != NULL, it contains the first
2268 data line - which terminated the headers before reaching a blank line (not the
2269 normal case). */
2270
2271 DEBUG(D_receive)
2272 {
2273 debug_printf(">>Headers received:\n");
2274 for (header_line * h = header_list->next; h; h = h->next)
2275 debug_printf("%s", h->text);
2276 debug_printf("\n");
2277 }
2278
2279 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2280 is dropped immediately after valid headers, the next thing we will see is EOF.
2281 We must test for this specially, as further down the reading of the data is
2282 skipped if already at EOF. */
2283
2284 if (smtp_input && (receive_feof)())
2285 {
2286 smtp_reply = handle_lost_connection(US" (after header)");
2287 smtp_yield = FALSE;
2288 goto TIDYUP; /* Skip to end of function */
2289 }
2290
2291 /* If this is a filter test run and no headers were read, output a warning
2292 in case there is a mistake in the test message. */
2293
2294 if (filter_test != FTEST_NONE && header_list->next == NULL)
2295 printf("Warning: no message headers read\n");
2296
2297
2298 /* Scan the headers to identify them. Some are merely marked for later
2299 processing; some are dealt with here. */
2300
2301 for (header_line * h = header_list->next; h; h = h->next)
2302 {
2303 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2304 if (is_resent) contains_resent_headers = TRUE;
2305
2306 switch (header_checkname(h, is_resent))
2307 {
2308 case htype_bcc:
2309 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2310 break;
2311
2312 case htype_cc:
2313 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2314 break;
2315
2316 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2317
2318 case htype_date:
2319 if (!resents_exist || is_resent) date_header_exists = TRUE;
2320 break;
2321
2322 /* Same comments as about Return-Path: below. */
2323
2324 case htype_delivery_date:
2325 if (delivery_date_remove) h->type = htype_old;
2326 break;
2327
2328 /* Same comments as about Return-Path: below. */
2329
2330 case htype_envelope_to:
2331 if (envelope_to_remove) h->type = htype_old;
2332 break;
2333
2334 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2335 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2336 header consists of just the login id of the user who called Exim, rewrite
2337 it with the gecos field first. Apply this rule to Resent-From: if there
2338 are resent- fields. */
2339
2340 case htype_from:
2341 h->type = htype_from;
2342 if (!resents_exist || is_resent)
2343 {
2344 from_header = h;
2345 if (!smtp_input)
2346 {
2347 int len;
2348 uschar *s = Ustrchr(h->text, ':') + 1;
2349 while (isspace(*s)) s++;
2350 len = h->slen - (s - h->text) - 1;
2351 if (Ustrlen(originator_login) == len &&
2352 strncmpic(s, originator_login, len) == 0)
2353 {
2354 uschar *name = is_resent? US"Resent-From" : US"From";
2355 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2356 originator_login, qualify_domain_sender);
2357 from_header = header_last;
2358 h->type = htype_old;
2359 DEBUG(D_receive|D_rewrite)
2360 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2361 }
2362 }
2363 }
2364 break;
2365
2366 /* Identify the Message-id: header for generating "in-reply-to" in the
2367 autoreply transport. For incoming logging, save any resent- value. In both
2368 cases, take just the first of any multiples. */
2369
2370 case htype_id:
2371 if (!msgid_header && (!resents_exist || is_resent))
2372 {
2373 msgid_header = h;
2374 h->type = htype_id;
2375 }
2376 break;
2377
2378 /* Flag all Received: headers */
2379
2380 case htype_received:
2381 h->type = htype_received;
2382 received_count++;
2383 break;
2384
2385 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2386
2387 case htype_reply_to:
2388 h->type = htype_reply_to;
2389 break;
2390
2391 /* The Return-path: header is supposed to be added to messages when
2392 they leave the SMTP system. We shouldn't receive messages that already
2393 contain Return-path. However, since Exim generates Return-path: on
2394 local delivery, resent messages may well contain it. We therefore
2395 provide an option (which defaults on) to remove any Return-path: headers
2396 on input. Removal actually means flagging as "old", which prevents the
2397 header being transmitted with the message. */
2398
2399 case htype_return_path:
2400 if (return_path_remove) h->type = htype_old;
2401
2402 /* If we are testing a mail filter file, use the value of the
2403 Return-Path: header to set up the return_path variable, which is not
2404 otherwise set. However, remove any <> that surround the address
2405 because the variable doesn't have these. */
2406
2407 if (filter_test != FTEST_NONE)
2408 {
2409 uschar *start = h->text + 12;
2410 uschar *end = start + Ustrlen(start);
2411 while (isspace(*start)) start++;
2412 while (end > start && isspace(end[-1])) end--;
2413 if (*start == '<' && end[-1] == '>')
2414 {
2415 start++;
2416 end--;
2417 }
2418 return_path = string_copyn(start, end - start);
2419 printf("Return-path taken from \"Return-path:\" header line\n");
2420 }
2421 break;
2422
2423 /* If there is a "Sender:" header and the message is locally originated,
2424 and from an untrusted caller and suppress_local_fixups is not set, or if we
2425 are in submission mode for a remote message, mark it "old" so that it will
2426 not be transmitted with the message, unless active_local_sender_retain is
2427 set. (This can only be true if active_local_from_check is false.) If there
2428 are any resent- headers in the message, apply this rule to Resent-Sender:
2429 instead of Sender:. Messages with multiple resent- header sets cannot be
2430 tidily handled. (For this reason, at least one MUA - Pine - turns old
2431 resent- headers into X-resent- headers when resending, leaving just one
2432 set.) */
2433
2434 case htype_sender:
2435 h->type = !f.active_local_sender_retain
2436 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2437 || f.submission_mode
2438 )
2439 && (!resents_exist || is_resent)
2440 ? htype_old : htype_sender;
2441 break;
2442
2443 /* Remember the Subject: header for logging. There is no Resent-Subject */
2444
2445 case htype_subject:
2446 subject_header = h;
2447 break;
2448
2449 /* "To:" gets flagged, and the existence of a recipient header is noted,
2450 whether it's resent- or not. */
2451
2452 case htype_to:
2453 h->type = htype_to;
2454 /****
2455 to_or_cc_header_exists = TRUE;
2456 ****/
2457 break;
2458 }
2459 }
2460
2461 /* Extract recipients from the headers if that is required (the -t option).
2462 Note that this is documented as being done *before* any address rewriting takes
2463 place. There are two possibilities:
2464
2465 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2466 recipients already listed are to be REMOVED from the message. Smail 3 works
2467 like this. We need to build a non-recipients tree for that list, because in
2468 subsequent processing this data is held in a tree and that's what the
2469 spool_write_header() function expects. Make sure that non-recipient addresses
2470 are fully qualified and rewritten if necessary.
2471
2472 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2473 those in the command line arguments (and it is rumoured some other MTAs do
2474 this). Therefore, there is an option to make Exim behave this way.
2475
2476 *** Notes on "Resent-" header lines ***
2477
2478 The presence of resent-headers in the message makes -t horribly ambiguous.
2479 Experiments with sendmail showed that it uses recipients for all resent-
2480 headers, totally ignoring the concept of "sets of resent- headers" as described
2481 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2482 with all the addresses in one instance of each header.
2483
2484 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2485 error for -t if there were resent- headers in the message. However, after a
2486 discussion on the mailing list, I've learned that there are MUAs that use
2487 resent- headers with -t, and also that the stuff about sets of resent- headers
2488 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2489 message with -t and resent- header lines makes sure that only *its* resent-
2490 headers are present; previous ones are often renamed as X-resent- for example.
2491
2492 Consequently, Exim has been changed so that, if any resent- header lines are
2493 present, the recipients are taken from all of the appropriate resent- lines,
2494 and not from the ordinary To:, Cc:, etc. */
2495
2496 if (extract_recip)
2497 {
2498 int rcount = 0;
2499 error_block **bnext = &bad_addresses;
2500
2501 if (extract_addresses_remove_arguments)
2502 {
2503 while (recipients_count-- > 0)
2504 {
2505 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2506 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2507 tree_add_nonrecipient(s);
2508 }
2509 recipients_list = NULL;
2510 recipients_count = recipients_list_max = 0;
2511 }
2512
2513 /* Now scan the headers */
2514
2515 for (header_line * h = header_list->next; h; h = h->next)
2516 {
2517 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2518 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2519 {
2520 uschar *s = Ustrchr(h->text, ':') + 1;
2521 while (isspace(*s)) s++;
2522
2523 f.parse_allow_group = TRUE; /* Allow address group syntax */
2524
2525 while (*s != 0)
2526 {
2527 uschar *ss = parse_find_address_end(s, FALSE);
2528 uschar *recipient, *errmess, *pp;
2529 int start, end, domain;
2530
2531 /* Check on maximum */
2532
2533 if (recipients_max > 0 && ++rcount > recipients_max)
2534 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2535 US"message rejected: ", error_rc, stdin, NULL);
2536 /* Does not return */
2537
2538 /* Make a copy of the address, and remove any internal newlines. These
2539 may be present as a result of continuations of the header line. The
2540 white space that follows the newline must not be removed - it is part
2541 of the header. */
2542
2543 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2544 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2545 *pp = 0;
2546
2547 #ifdef SUPPORT_I18N
2548 {
2549 BOOL b = allow_utf8_domains;
2550 allow_utf8_domains = TRUE;
2551 #endif
2552 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2553 &domain, FALSE);
2554
2555 #ifdef SUPPORT_I18N
2556 if (string_is_utf8(recipient))
2557 message_smtputf8 = TRUE;
2558 else
2559 allow_utf8_domains = b;
2560 }
2561 #endif
2562
2563 /* Keep a list of all the bad addresses so we can send a single
2564 error message at the end. However, an empty address is not an error;
2565 just ignore it. This can come from an empty group list like
2566
2567 To: Recipients of list:;
2568
2569 If there are no recipients at all, an error will occur later. */
2570
2571 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2572 {
2573 int len = Ustrlen(s);
2574 error_block *b = store_get(sizeof(error_block), FALSE);
2575 while (len > 0 && isspace(s[len-1])) len--;
2576 b->next = NULL;
2577 b->text1 = string_printing(string_copyn(s, len));
2578 b->text2 = errmess;
2579 *bnext = b;
2580 bnext = &(b->next);
2581 }
2582
2583 /* If the recipient is already in the nonrecipients tree, it must
2584 have appeared on the command line with the option extract_addresses_
2585 remove_arguments set. Do not add it to the recipients, and keep a note
2586 that this has happened, in order to give a better error if there are
2587 no recipients left. */
2588
2589 else if (recipient != NULL)
2590 {
2591 if (tree_search(tree_nonrecipients, recipient) == NULL)
2592 receive_add_recipient(recipient, -1);
2593 else
2594 extracted_ignored = TRUE;
2595 }
2596
2597 /* Move on past this address */
2598
2599 s = ss + (*ss? 1:0);
2600 while (isspace(*s)) s++;
2601 } /* Next address */
2602
2603 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2604 f.parse_found_group = FALSE;
2605
2606 /* If this was the bcc: header, mark it "old", which means it
2607 will be kept on the spool, but not transmitted as part of the
2608 message. */
2609
2610 if (h->type == htype_bcc) h->type = htype_old;
2611 } /* For appropriate header line */
2612 } /* For each header line */
2613
2614 }
2615
2616 /* Now build the unique message id. This has changed several times over the
2617 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2618 Retaining all the history in the comment has become too unwieldy - read
2619 previous release sources if you want it.
2620
2621 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2622 The first part is the current time, in seconds. The second part is the current
2623 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2624 can hold a number in the range 0-3843. It used to be a computed sequence
2625 number, but is now the fractional component of the current time in units of
2626 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2627 received, Exim ensures that the timer has ticked at the appropriate level
2628 before proceeding, to avoid duplication if the pid happened to be re-used
2629 within the same time period. It seems likely that most messages will take at
2630 least half a millisecond to be received, so no delay will normally be
2631 necessary. At least for some time...
2632
2633 There is a modification when localhost_number is set. Formerly this was allowed
2634 to be as large as 255. Now it is restricted to the range 0-16, and the final
2635 component of the message id becomes (localhost_number * 200) + fractional time
2636 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2637
2638 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2639 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2640 still allows the tttttt field to hold a large enough number to last for some
2641 more decades, and the final two-digit field can hold numbers up to 1295, which
2642 is enough for milliseconds (instead of 1/2000 of a second).
2643
2644 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2645 pid, so it is probably safe because pids have to be positive. The
2646 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2647 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2648
2649 Note that string_base62() returns its data in a static storage block, so it
2650 must be copied before calling string_base62() again. It always returns exactly
2651 6 characters.
2652
2653 There doesn't seem to be anything in the RFC which requires a message id to
2654 start with a letter, but Smail was changed to ensure this. The external form of
2655 the message id (as supplied by string expansion) therefore starts with an
2656 additional leading 'E'. The spool file names do not include this leading
2657 letter and it is not used internally.
2658
2659 NOTE: If ever the format of message ids is changed, the regular expression for
2660 checking that a string is in this format must be updated in a corresponding
2661 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2662 must also be changed to reflect the correct string length. The queue-sort code
2663 needs to know the layout. Then, of course, other programs that rely on the
2664 message id format will need updating too. */
2665
2666 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2667 message_id[6] = '-';
2668 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2669
2670 /* Deal with the case where the host number is set. The value of the number was
2671 checked when it was read, to ensure it isn't too big. The timing granularity is
2672 left in id_resolution so that an appropriate wait can be done after receiving
2673 the message, if necessary (we hope it won't be). */
2674
2675 if (host_number_string)
2676 {
2677 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2678 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2679 string_base62((long int)(
2680 host_number * (1000000/id_resolution) +
2681 message_id_tv.tv_usec/id_resolution)) + 4);
2682 }
2683
2684 /* Host number not set: final field is just the fractional time at an
2685 appropriate resolution. */
2686
2687 else
2688 {
2689 id_resolution = BASE_62 == 62 ? 500 : 1000;
2690 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2691 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2692 }
2693
2694 /* Add the current message id onto the current process info string if
2695 it will fit. */
2696
2697 (void)string_format(process_info + process_info_len,
2698 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2699
2700 /* If we are using multiple input directories, set up the one for this message
2701 to be the least significant base-62 digit of the time of arrival. Otherwise
2702 ensure that it is an empty string. */
2703
2704 set_subdir_str(message_subdir, message_id, 0);
2705
2706 /* Now that we have the message-id, if there is no message-id: header, generate
2707 one, but only for local (without suppress_local_fixups) or submission mode
2708 messages. This can be user-configured if required, but we had better flatten
2709 any illegal characters therein. */
2710
2711 if ( !msgid_header
2712 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2713 {
2714 uschar *id_text = US"";
2715 uschar *id_domain = primary_hostname;
2716 header_line * h;
2717
2718 /* Permit only letters, digits, dots, and hyphens in the domain */
2719
2720 if (message_id_domain)
2721 {
2722 uschar *new_id_domain = expand_string(message_id_domain);
2723 if (!new_id_domain)
2724 {
2725 if (!f.expand_string_forcedfail)
2726 log_write(0, LOG_MAIN|LOG_PANIC,
2727 "expansion of \"%s\" (message_id_header_domain) "
2728 "failed: %s", message_id_domain, expand_string_message);
2729 }
2730 else if (*new_id_domain)
2731 {
2732 id_domain = new_id_domain;
2733 for (uschar * p = id_domain; *p; p++)
2734 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2735 }
2736 }
2737
2738 /* Permit all characters except controls and RFC 2822 specials in the
2739 additional text part. */
2740
2741 if (message_id_text)
2742 {
2743 uschar *new_id_text = expand_string(message_id_text);
2744 if (!new_id_text)
2745 {
2746 if (!f.expand_string_forcedfail)
2747 log_write(0, LOG_MAIN|LOG_PANIC,
2748 "expansion of \"%s\" (message_id_header_text) "
2749 "failed: %s", message_id_text, expand_string_message);
2750 }
2751 else if (*new_id_text)
2752 {
2753 id_text = new_id_text;
2754 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2755 }
2756 }
2757
2758 /* Add the header line.
2759 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2760 appended, to preserve classical expectations of header ordering. */
2761
2762 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2763 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2764 *id_text == 0 ? "" : ".", id_text, id_domain);
2765
2766 /* Arrange for newly-created Message-Id to be logged */
2767
2768 if (!resents_exist)
2769 {
2770 msgid_header_newly_created = TRUE;
2771 msgid_header = h;
2772 }
2773 }
2774
2775 /* If we are to log recipients, keep a copy of the raw ones before any possible
2776 rewriting. Must copy the count, because later ACLs and the local_scan()
2777 function may mess with the real recipients. */
2778
2779 if (LOGGING(received_recipients))
2780 {
2781 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2782 for (int i = 0; i < recipients_count; i++)
2783 raw_recipients[i] = string_copy(recipients_list[i].address);
2784 raw_recipients_count = recipients_count;
2785 }
2786
2787 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2788 recipients will get here only if the conditions were right (allow_unqualified_
2789 recipient is TRUE). */
2790
2791 for (int i = 0; i < recipients_count; i++)
2792 recipients_list[i].address =
2793 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2794 global_rewrite_rules, rewrite_existflags);
2795
2796 /* If there is no From: header, generate one for local (without
2797 suppress_local_fixups) or submission_mode messages. If there is no sender
2798 address, but the sender is local or this is a local delivery error, use the
2799 originator login. This shouldn't happen for genuine bounces, but might happen
2800 for autoreplies. The addition of From: must be done *before* checking for the
2801 possible addition of a Sender: header, because untrusted_set_sender allows an
2802 untrusted user to set anything in the envelope (which might then get info
2803 From:) but we still want to ensure a valid Sender: if it is required. */
2804
2805 if ( !from_header
2806 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2807 {
2808 uschar *oname = US"";
2809
2810 /* Use the originator_name if this is a locally submitted message and the
2811 caller is not trusted. For trusted callers, use it only if -F was used to
2812 force its value or if we have a non-SMTP message for which -f was not used
2813 to set the sender. */
2814
2815 if (!sender_host_address)
2816 {
2817 if (!f.trusted_caller || f.sender_name_forced ||
2818 (!smtp_input && !f.sender_address_forced))
2819 oname = originator_name;
2820 }
2821
2822 /* For non-locally submitted messages, the only time we use the originator
2823 name is when it was forced by the /name= option on control=submission. */
2824
2825 else if (submission_name) oname = submission_name;
2826
2827 /* Envelope sender is empty */
2828
2829 if (!*sender_address)
2830 {
2831 uschar *fromstart, *fromend;
2832
2833 fromstart = string_sprintf("%sFrom: %s%s",
2834 resent_prefix, oname, *oname ? " <" : "");
2835 fromend = *oname ? US">" : US"";
2836
2837 if (f.sender_local || f.local_error_message)
2838 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2839 local_part_quote(originator_login), qualify_domain_sender,
2840 fromend);
2841
2842 else if (f.submission_mode && authenticated_id)
2843 {
2844 if (!submission_domain)
2845 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2846 local_part_quote(authenticated_id), qualify_domain_sender,
2847 fromend);
2848
2849 else if (!*submission_domain) /* empty => whole address set */
2850 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2851 fromend);
2852
2853 else
2854 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2855 local_part_quote(authenticated_id), submission_domain, fromend);
2856
2857 from_header = header_last; /* To get it checked for Sender: */
2858 }
2859 }
2860
2861 /* There is a non-null envelope sender. Build the header using the original
2862 sender address, before any rewriting that might have been done while
2863 verifying it. */
2864
2865 else
2866 {
2867 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2868 oname,
2869 *oname ? " <" : "",
2870 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2871 *oname ? ">" : "");
2872
2873 from_header = header_last; /* To get it checked for Sender: */
2874 }
2875 }
2876
2877
2878 /* If the sender is local (without suppress_local_fixups), or if we are in
2879 submission mode and there is an authenticated_id, check that an existing From:
2880 is correct, and if not, generate a Sender: header, unless disabled. Any
2881 previously-existing Sender: header was removed above. Note that sender_local,
2882 as well as being TRUE if the caller of exim is not trusted, is also true if a
2883 trusted caller did not supply a -f argument for non-smtp input. To allow
2884 trusted callers to forge From: without supplying -f, we have to test explicitly
2885 here. If the From: header contains more than one address, then the call to
2886 parse_extract_address fails, and a Sender: header is inserted, as required. */
2887
2888 if ( from_header
2889 && ( f.active_local_from_check
2890 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2891 || f.submission_mode && authenticated_id
2892 ) ) )
2893 {
2894 BOOL make_sender = TRUE;
2895 int start, end, domain;
2896 uschar *errmess;
2897 uschar *from_address =
2898 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2899 &start, &end, &domain, FALSE);
2900 uschar *generated_sender_address;
2901
2902 generated_sender_address = f.submission_mode
2903 ? !submission_domain
2904 ? string_sprintf("%s@%s",
2905 local_part_quote(authenticated_id), qualify_domain_sender)
2906 : !*submission_domain /* empty => full address */
2907 ? string_sprintf("%s", authenticated_id)
2908 : string_sprintf("%s@%s",
2909 local_part_quote(authenticated_id), submission_domain)
2910 : string_sprintf("%s@%s",
2911 local_part_quote(originator_login), qualify_domain_sender);
2912
2913 /* Remove permitted prefixes and suffixes from the local part of the From:
2914 address before doing the comparison with the generated sender. */
2915
2916 if (from_address)
2917 {
2918 int slen;
2919 uschar *at = domain ? from_address + domain - 1 : NULL;
2920
2921 if (at) *at = 0;
2922 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2923 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2924 {
2925 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2926 from_address += slen;
2927 }
2928 if (at) *at = '@';
2929
2930 if ( strcmpic(generated_sender_address, from_address) == 0
2931 || (!domain && strcmpic(from_address, originator_login) == 0))
2932 make_sender = FALSE;
2933 }
2934
2935 /* We have to cause the Sender header to be rewritten if there are
2936 appropriate rewriting rules. */
2937
2938 if (make_sender)
2939 if (f.submission_mode && !submission_name)
2940 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2941 generated_sender_address);
2942 else
2943 header_add(htype_sender, "%sSender: %s <%s>\n",
2944 resent_prefix,
2945 f.submission_mode ? submission_name : originator_name,
2946 generated_sender_address);
2947
2948 /* Ensure that a non-null envelope sender address corresponds to the
2949 submission mode sender address. */
2950
2951 if (f.submission_mode && *sender_address)
2952 {
2953 if (!sender_address_unrewritten)
2954 sender_address_unrewritten = sender_address;
2955 sender_address = generated_sender_address;
2956 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2957 log_write(L_address_rewrite, LOG_MAIN,
2958 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2959 sender_address_unrewritten, generated_sender_address);
2960 }
2961 }
2962
2963 /* If there are any rewriting rules, apply them to the sender address, unless
2964 it has already been rewritten as part of verification for SMTP input. */
2965
2966 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2967 {
2968 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2969 global_rewrite_rules, rewrite_existflags);
2970 DEBUG(D_receive|D_rewrite)
2971 debug_printf("rewritten sender = %s\n", sender_address);
2972 }
2973
2974
2975 /* The headers must be run through rewrite_header(), because it ensures that
2976 addresses are fully qualified, as well as applying any rewriting rules that may
2977 exist.
2978
2979 Qualification of header addresses in a message from a remote host happens only
2980 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2981 appropriate. For local messages, qualification always happens, unless -bnq is
2982 used to explicitly suppress it. No rewriting is done for an unqualified address
2983 that is left untouched.
2984
2985 We start at the second header, skipping our own Received:. This rewriting is
2986 documented as happening *after* recipient addresses are taken from the headers
2987 by the -t command line option. An added Sender: gets rewritten here. */
2988
2989 for (header_line * h = header_list->next; h; h = h->next)
2990 {
2991 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2992 rewrite_existflags, TRUE);
2993 if (newh) h = newh;
2994 }
2995
2996
2997 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2998 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2999 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3000 exists, this applies to the set of resent- headers rather than the normal set.
3001
3002 The requirement for a recipient header has been removed in RFC 2822. At this
3003 point in the code, earlier versions of Exim added a To: header for locally
3004 submitted messages, and an empty Bcc: header for others. In the light of the
3005 changes in RFC 2822, this was dropped in November 2003. */
3006
3007
3008 /* If there is no date header, generate one if the message originates locally
3009 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3010 submission mode flag is set. Messages without Date: are not valid, but it seems
3011 to be more confusing if Exim adds one to all remotely-originated messages.
3012 As per Message-Id, we prepend if resending, else append.
3013 */
3014
3015 if ( !date_header_exists
3016 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3017 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3018 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3019
3020 search_tidyup(); /* Free any cached resources */
3021
3022 /* Show the complete set of headers if debugging. Note that the first one (the
3023 new Received:) has not yet been set. */
3024
3025 DEBUG(D_receive)
3026 {
3027 debug_printf(">>Headers after rewriting and local additions:\n");
3028 for (header_line * h = header_list->next; h; h = h->next)
3029 debug_printf("%c %s", h->type, h->text);
3030 debug_printf("\n");
3031 }
3032
3033 /* The headers are now complete in store. If we are running in filter
3034 testing mode, that is all this function does. Return TRUE if the message
3035 ended with a dot. */
3036
3037 if (filter_test != FTEST_NONE)
3038 {
3039 process_info[process_info_len] = 0;
3040 return message_ended == END_DOT;
3041 }
3042
3043 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3044 think more if it could be handled. Cannot do onward CHUNKING unless
3045 inbound is, but inbound chunking ought to be ok with outbound plain.
3046 Could we do onward CHUNKING given inbound CHUNKING?
3047 */
3048 if (chunking_state > CHUNKING_OFFERED)
3049 cancel_cutthrough_connection(FALSE, US"chunking active");
3050
3051 /* Cutthrough delivery:
3052 We have to create the Received header now rather than at the end of reception,
3053 so the timestamp behaviour is a change to the normal case.
3054 Having created it, send the headers to the destination. */
3055
3056 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3057 {
3058 if (received_count > received_headers_max)
3059 {
3060 cancel_cutthrough_connection(TRUE, US"too many headers");
3061 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3062 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3063 "Too many \"Received\" headers",
3064 sender_address,
3065 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3066 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3067 message_id[0] = 0; /* Indicate no message accepted */
3068 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3069 goto TIDYUP; /* Skip to end of function */
3070 }
3071 received_header_gen();
3072 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3073 (void) cutthrough_headers_send();
3074 }
3075
3076
3077 /* Open a new spool file for the data portion of the message. We need
3078 to access it both via a file descriptor and a stream. Try to make the
3079 directory if it isn't there. */
3080
3081 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3082 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3083
3084 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3085 {
3086 if (errno == ENOENT)
3087 {
3088 (void) directory_make(spool_directory,
3089 spool_sname(US"input", message_subdir),
3090 INPUT_DIRECTORY_MODE, TRUE);
3091 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3092 }
3093 if (data_fd < 0)
3094 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3095 spool_name, strerror(errno));
3096 }
3097
3098 /* Make sure the file's group is the Exim gid, and double-check the mode
3099 because the group setting doesn't always get set automatically. */
3100
3101 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3102 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3103 "Failed setting ownership on spool file %s: %s",
3104 spool_name, strerror(errno));
3105 (void)fchmod(data_fd, SPOOL_MODE);
3106
3107 /* We now have data file open. Build a stream for it and lock it. We lock only
3108 the first line of the file (containing the message ID) because otherwise there
3109 are problems when Exim is run under Cygwin (I'm told). See comments in
3110 spool_in.c, where the same locking is done. */
3111
3112 spool_data_file = fdopen(data_fd, "w+");
3113 lock_data.l_type = F_WRLCK;
3114 lock_data.l_whence = SEEK_SET;
3115 lock_data.l_start = 0;
3116 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3117
3118 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3119 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3120 errno, strerror(errno));
3121
3122 /* We have an open, locked data file. Write the message id to it to make it
3123 self-identifying. Then read the remainder of the input of this message and
3124 write it to the data file. If the variable next != NULL, it contains the first
3125 data line (which was read as a header but then turned out not to have the right
3126 format); write it (remembering that it might contain binary zeros). The result
3127 of fwrite() isn't inspected; instead we call ferror() below. */
3128
3129 fprintf(spool_data_file, "%s-D\n", message_id);
3130 if (next)
3131 {
3132 uschar *s = next->text;
3133 int len = next->slen;
3134 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3135 body_linecount++; /* Assumes only 1 line */
3136 }
3137
3138 /* Note that we might already be at end of file, or the logical end of file
3139 (indicated by '.'), or might have encountered an error while writing the
3140 message id or "next" line. */
3141
3142 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3143 {
3144 if (smtp_input)
3145 {
3146 message_ended = chunking_state <= CHUNKING_OFFERED
3147 ? read_message_data_smtp(spool_data_file)
3148 : spool_wireformat
3149 ? read_message_bdat_smtp_wire(spool_data_file)
3150 : read_message_bdat_smtp(spool_data_file);
3151 receive_linecount++; /* The terminating "." line */
3152 }
3153 else
3154 message_ended = read_message_data(spool_data_file);
3155
3156 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3157 message_linecount += body_linecount;
3158
3159 switch (message_ended)
3160 {
3161 /* Handle premature termination of SMTP */
3162
3163 case END_EOF:
3164 if (smtp_input)
3165 {
3166 Uunlink(spool_name); /* Lose data file when closed */
3167 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3168 message_id[0] = 0; /* Indicate no message accepted */
3169 smtp_reply = handle_lost_connection(US"");
3170 smtp_yield = FALSE;
3171 goto TIDYUP; /* Skip to end of function */
3172 }
3173 break;
3174
3175 /* Handle message that is too big. Don't use host_or_ident() in the log
3176 message; we want to see the ident value even for non-remote messages. */
3177
3178 case END_SIZE:
3179 Uunlink(spool_name); /* Lose the data file when closed */
3180 cancel_cutthrough_connection(TRUE, US"mail too big");
3181 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3182
3183 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3184 "message too big: read=%d max=%d",
3185 sender_address,
3186 sender_fullhost ? " H=" : "",
3187 sender_fullhost ? sender_fullhost : US"",
3188 sender_ident ? " U=" : "",
3189 sender_ident ? sender_ident : US"",
3190 message_size,
3191 thismessage_size_limit);
3192
3193 if (smtp_input)
3194 {
3195 smtp_reply = US"552 Message size exceeds maximum permitted";
3196 message_id[0] = 0; /* Indicate no message accepted */
3197 goto TIDYUP; /* Skip to end of function */
3198 }
3199 else
3200 {
3201 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3202 give_local_error(ERRMESS_TOOBIG,
3203 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3204 US"message rejected: ", error_rc, spool_data_file, header_list);
3205 /* Does not return */
3206 }
3207 break;
3208
3209 /* Handle bad BDAT protocol sequence */
3210
3211 case END_PROTOCOL:
3212 Uunlink(spool_name); /* Lose the data file when closed */
3213 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3214 smtp_reply = US""; /* Response already sent */
3215 message_id[0] = 0; /* Indicate no message accepted */
3216 goto TIDYUP; /* Skip to end of function */
3217 }
3218 }
3219
3220 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3221 example, there may be some expansion in an ACL that uses a timer.) */
3222
3223 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3224
3225 /* The message body has now been read into the data file. Call fflush() to
3226 empty the buffers in C, and then call fsync() to get the data written out onto
3227 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3228 having to do this). If there was an I/O error on either input or output,
3229 attempt to send an error message, and unlink the spool file. For non-SMTP input
3230 we can then give up. Note that for SMTP input we must swallow the remainder of
3231 the input in cases of output errors, since the far end doesn't expect to see
3232 anything until the terminating dot line is sent. */
3233
3234 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3235 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3236 {
3237 uschar *msg_errno = US strerror(errno);
3238 BOOL input_error = (receive_ferror)() != 0;
3239 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3240 input_error? "Input read" : "Spool write",
3241 msg_errno,
3242 sender_fullhost ? sender_fullhost : sender_ident);
3243
3244 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3245 Uunlink(spool_name); /* Lose the data file */
3246 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3247
3248 if (smtp_input)
3249 {
3250 if (input_error)
3251 smtp_reply = US"451 Error while reading input data";
3252 else
3253 {
3254 smtp_reply = US"451 Error while writing spool file";
3255 receive_swallow_smtp();
3256 }
3257 message_id[0] = 0; /* Indicate no message accepted */
3258 goto TIDYUP; /* Skip to end of function */
3259 }
3260
3261 else
3262 {
3263 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3264 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3265 header_list);
3266 /* Does not return */
3267 }
3268 }
3269
3270
3271 /* No I/O errors were encountered while writing the data file. */
3272
3273 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3274 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3275
3276
3277 /* If there were any bad addresses extracted by -t, or there were no recipients
3278 left after -t, send a message to the sender of this message, or write it to
3279 stderr if the error handling option is set that way. Note that there may
3280 legitimately be no recipients for an SMTP message if they have all been removed
3281 by "discard".
3282
3283 We need to rewind the data file in order to read it. In the case of no
3284 recipients or stderr error writing, throw the data file away afterwards, and
3285 exit. (This can't be SMTP, which always ensures there's at least one
3286 syntactically good recipient address.) */
3287
3288 if (extract_recip && (bad_addresses || recipients_count == 0))
3289 {
3290 DEBUG(D_receive)
3291 {
3292 if (recipients_count == 0) debug_printf("*** No recipients\n");
3293 if (bad_addresses)
3294 {
3295 debug_printf("*** Bad address(es)\n");
3296 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3297 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3298 }
3299 }
3300
3301 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3302 message_id, bad_addresses ? "bad addresses" : "no recipients");
3303
3304 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3305
3306 /* If configured to send errors to the sender, but this fails, force
3307 a failure error code. We use a special one for no recipients so that it
3308 can be detected by the autoreply transport. Otherwise error_rc is set to
3309 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3310 it is EXIT_SUCCESS. */
3311
3312 if (error_handling == ERRORS_SENDER)
3313 {
3314 if (!moan_to_sender(
3315 bad_addresses
3316 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3317 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3318 bad_addresses, header_list, spool_data_file, FALSE
3319 ) )
3320 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3321 }
3322 else
3323 {
3324 if (!bad_addresses)
3325 if (extracted_ignored)
3326 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3327 else
3328 fprintf(stderr, "exim: no recipients in message\n");
3329 else
3330 {
3331 fprintf(stderr, "exim: invalid address%s",
3332 bad_addresses->next ? "es:\n" : ":");
3333 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3334 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3335 bad_addresses->text2);
3336 }
3337 }
3338
3339 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3340 {
3341 Uunlink(spool_name);
3342 (void)fclose(spool_data_file);
3343 exim_exit(error_rc);
3344 }
3345 }
3346
3347 /* Data file successfully written. Generate text for the Received: header by
3348 expanding the configured string, and adding a timestamp. By leaving this
3349 operation till now, we ensure that the timestamp is the time that message
3350 reception was completed. However, this is deliberately done before calling the
3351 data ACL and local_scan().
3352
3353 This Received: header may therefore be inspected by the data ACL and by code in
3354 the local_scan() function. When they have run, we update the timestamp to be
3355 the final time of reception.
3356
3357 If there is just one recipient, set up its value in the $received_for variable
3358 for use when we generate the Received: header.
3359
3360 Note: the checking for too many Received: headers is handled by the delivery
3361 code. */
3362 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3363
3364 if (!received_header->text) /* Non-cutthrough case */
3365 {
3366 received_header_gen();
3367
3368 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3369
3370 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3371 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3372
3373 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3374 now, before running the DATA ACL. */
3375
3376 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3377 }
3378 else
3379 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3380 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3381
3382 /* If an ACL is specified for checking things at this stage of reception of a
3383 message, run it, unless all the recipients were removed by "discard" in earlier
3384 ACLs. That is the only case in which recipients_count can be zero at this
3385 stage. Set deliver_datafile to point to the data file so that $message_body and
3386 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3387 */
3388
3389 deliver_datafile = data_fd;
3390 user_msg = NULL;
3391
3392 f.enable_dollar_recipients = TRUE;
3393
3394 if (recipients_count == 0)
3395 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3396
3397 else
3398 {
3399 /* Handle interactive SMTP messages */
3400
3401 if (smtp_input && !smtp_batched_input)
3402 {
3403
3404 #ifndef DISABLE_DKIM
3405 if (!f.dkim_disable_verify)
3406 {
3407 /* Finish verification */
3408 dkim_exim_verify_finish();
3409
3410 /* Check if we must run the DKIM ACL */
3411 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3412 {
3413 uschar * dkim_verify_signers_expanded =
3414 expand_string(dkim_verify_signers);
3415 gstring * results = NULL;
3416 int signer_sep = 0;
3417 const uschar * ptr;
3418 uschar * item;
3419 gstring * seen_items = NULL;
3420 int old_pool = store_pool;
3421
3422 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3423
3424 if (!(ptr = dkim_verify_signers_expanded))
3425 log_write(0, LOG_MAIN|LOG_PANIC,
3426 "expansion of dkim_verify_signers option failed: %s",
3427 expand_string_message);
3428
3429 /* Default to OK when no items are present */
3430 rc = OK;
3431 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3432 {
3433 /* Prevent running ACL for an empty item */
3434 if (!item || !*item) continue;
3435
3436 /* Only run ACL once for each domain or identity,
3437 no matter how often it appears in the expanded list. */
3438 if (seen_items)
3439 {
3440 uschar * seen_item;
3441 const uschar * seen_items_list = string_from_gstring(seen_items);
3442 int seen_sep = ':';
3443 BOOL seen_this_item = FALSE;
3444
3445 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3446 NULL, 0)))
3447 if (Ustrcmp(seen_item,item) == 0)
3448 {
3449 seen_this_item = TRUE;
3450 break;
3451 }
3452
3453 if (seen_this_item)
3454 {
3455 DEBUG(D_receive)
3456 debug_printf("acl_smtp_dkim: skipping signer %s, "
3457 "already seen\n", item);
3458 continue;
3459 }
3460
3461 seen_items = string_catn(seen_items, US":", 1);
3462 }
3463 seen_items = string_cat(seen_items, item);
3464
3465 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3466 if (rc != OK)
3467 {
3468 DEBUG(D_receive)
3469 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3470 "skipping remaining items\n", rc, item);
3471 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3472 break;
3473 }
3474 }
3475 dkim_verify_status = string_from_gstring(results);
3476 store_pool = old_pool;
3477 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3478 if (rc == DISCARD)
3479 {
3480 recipients_count = 0;
3481 blackholed_by = US"DKIM ACL";
3482 if (log_msg)
3483 blackhole_log_msg = string_sprintf(": %s", log_msg);
3484 }
3485 else if (rc != OK)
3486 {
3487 Uunlink(spool_name);
3488 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3489 smtp_yield = FALSE; /* No more messages after dropped connection */
3490 smtp_reply = US""; /* Indicate reply already sent */
3491 message_id[0] = 0; /* Indicate no message accepted */
3492 goto TIDYUP; /* Skip to end of function */
3493 }
3494 }
3495 else
3496 dkim_exim_verify_log_all();
3497 }
3498 #endif /* DISABLE_DKIM */
3499
3500 #ifdef WITH_CONTENT_SCAN
3501 if ( recipients_count > 0
3502 && acl_smtp_mime
3503 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3504 )
3505 goto TIDYUP;
3506 #endif /* WITH_CONTENT_SCAN */
3507
3508 #ifdef SUPPORT_DMARC
3509 dmarc_store_data(from_header);
3510 #endif
3511
3512 #ifndef DISABLE_PRDR
3513 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3514 {
3515 int all_pass = OK;
3516 int all_fail = FAIL;
3517
3518 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3519 /* Loop through recipients, responses must be in same order received */
3520 for (unsigned int c = 0; recipients_count > c; c++)
3521 {
3522 uschar * addr= recipients_list[c].address;
3523 uschar * msg= US"PRDR R=<%s> %s";
3524 uschar * code;
3525 DEBUG(D_receive)
3526 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3527 addr, c+1, recipients_count);
3528 rc = acl_check(ACL_WHERE_PRDR, addr,
3529 acl_smtp_data_prdr, &user_msg, &log_msg);
3530
3531 /* If any recipient rejected content, indicate it in final message */
3532 all_pass |= rc;
3533 /* If all recipients rejected, indicate in final message */
3534 all_fail &= rc;
3535
3536 switch (rc)
3537 {
3538 case OK: case DISCARD: code = US"250"; break;
3539 case DEFER: code = US"450"; break;
3540 default: code = US"550"; break;
3541 }
3542 if (user_msg != NULL)
3543 smtp_user_msg(code, user_msg);
3544 else
3545 {
3546 switch (rc)
3547 {
3548 case OK: case DISCARD:
3549 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3550 case DEFER:
3551 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3552 default:
3553 msg = string_sprintf(CS msg, addr, "refusal"); break;
3554 }
3555 smtp_user_msg(code, msg);
3556 }
3557 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3558 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3559 else log_write(0, LOG_MAIN, "%s", CS msg);
3560
3561 if (rc != OK) { receive_remove_recipient(addr); c--; }
3562 }
3563 /* Set up final message, used if data acl gives OK */
3564 smtp_reply = string_sprintf("%s id=%s message %s",
3565 all_fail == FAIL ? US"550" : US"250",
3566 message_id,
3567 all_fail == FAIL
3568 ? US"rejected for all recipients"
3569 : all_pass == OK
3570 ? US"accepted"
3571 : US"accepted for some recipients");
3572 if (recipients_count == 0)
3573 {
3574 message_id[0] = 0; /* Indicate no message accepted */
3575 goto TIDYUP;
3576 }
3577 }
3578 else
3579 prdr_requested = FALSE;
3580 #endif /* !DISABLE_PRDR */
3581
3582 /* Check the recipients count again, as the MIME ACL might have changed
3583 them. */
3584
3585 if (acl_smtp_data != NULL && recipients_count > 0)
3586 {
3587 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3588 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3589 if (rc == DISCARD)
3590 {
3591 recipients_count = 0;
3592 blackholed_by = US"DATA ACL";
3593 if (log_msg)
3594 blackhole_log_msg = string_sprintf(": %s", log_msg);
3595 cancel_cutthrough_connection(TRUE, US"data acl discard");
3596 }
3597 else if (rc != OK)
3598 {
3599 Uunlink(spool_name);
3600 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3601 #ifdef WITH_CONTENT_SCAN
3602 unspool_mbox();
3603 #endif
3604 #ifdef EXPERIMENTAL_DCC
3605 dcc_ok = 0;
3606 #endif
3607 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3608 smtp_yield = FALSE; /* No more messages after dropped connection */
3609 smtp_reply = US""; /* Indicate reply already sent */
3610 message_id[0] = 0; /* Indicate no message accepted */
3611 goto TIDYUP; /* Skip to end of function */
3612 }
3613 }
3614 }
3615
3616 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3617 we cannot take different actions for permanent and temporary rejections. */
3618
3619 else
3620 {
3621
3622 #ifdef WITH_CONTENT_SCAN
3623 if ( acl_not_smtp_mime
3624 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3625 &blackholed_by)
3626 )
3627 goto TIDYUP;
3628 #endif /* WITH_CONTENT_SCAN */
3629
3630 if (acl_not_smtp)
3631 {
3632 uschar *user_msg, *log_msg;
3633 f.authentication_local = TRUE;
3634 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3635 if (rc == DISCARD)
3636 {
3637 recipients_count = 0;
3638 blackholed_by = US"non-SMTP ACL";
3639 if (log_msg)
3640 blackhole_log_msg = string_sprintf(": %s", log_msg);
3641 }
3642 else if (rc != OK)
3643 {
3644 Uunlink(spool_name);
3645 #ifdef WITH_CONTENT_SCAN
3646 unspool_mbox();
3647 #endif
3648 #ifdef EXPERIMENTAL_DCC
3649 dcc_ok = 0;
3650 #endif
3651 /* The ACL can specify where rejections are to be logged, possibly
3652 nowhere. The default is main and reject logs. */
3653
3654 if (log_reject_target)
3655 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3656 sender_address, log_msg);
3657
3658 if (!user_msg) user_msg = US"local configuration problem";
3659 if (smtp_batched_input)
3660 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3661 /* Does not return */
3662 else
3663 {
3664 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3665 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3666 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3667 header_list);
3668 /* Does not return */
3669 }
3670 }
3671 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3672 }
3673 }
3674
3675 /* The applicable ACLs have been run */
3676
3677 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3678 if (f.queue_only_policy) queued_by = US"ACL";
3679 }
3680
3681 #ifdef WITH_CONTENT_SCAN
3682 unspool_mbox();
3683 #endif
3684
3685 #ifdef EXPERIMENTAL_DCC
3686 dcc_ok = 0;
3687 #endif
3688
3689
3690 #ifdef HAVE_LOCAL_SCAN
3691 /* The final check on the message is to run the scan_local() function. The
3692 version supplied with Exim always accepts, but this is a hook for sysadmins to
3693 supply their own checking code. The local_scan() function is run even when all
3694 the recipients have been discarded. */
3695
3696 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3697
3698 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3699 deleted, and the incident gets logged. */
3700
3701 if (sigsetjmp(local_scan_env, 1) == 0)
3702 {
3703 had_local_scan_crash = 0;
3704 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3705 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3706 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3707 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3708
3709 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3710 local_scan_timeout);
3711 local_scan_data = NULL;
3712
3713 had_local_scan_timeout = 0;
3714 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3715 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3716 rc = local_scan(data_fd, &local_scan_data);
3717 ALARM_CLR(0);
3718 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3719
3720 f.enable_dollar_recipients = FALSE;
3721
3722 store_pool = POOL_MAIN; /* In case changed */
3723 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3724 local_scan_data);
3725
3726 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3727 os_non_restarting_signal(SIGFPE, SIG_DFL);
3728 os_non_restarting_signal(SIGILL, SIG_DFL);
3729 os_non_restarting_signal(SIGBUS, SIG_DFL);
3730 }
3731 else
3732 {
3733 if (had_local_scan_crash)
3734 {
3735 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3736 "signal %d - message temporarily rejected (size %d)",
3737 had_local_scan_crash, message_size);
3738 receive_bomb_out(US"local-scan-error", US"local verification problem");
3739 /* Does not return */
3740 }
3741 if (had_local_scan_timeout)
3742 {
3743 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3744 "message temporarily rejected (size %d)", message_size);
3745 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3746 /* Does not return */
3747 }
3748 }
3749
3750 /* The length check is paranoia against some runaway code, and also because
3751 (for a success return) lines in the spool file are read into big_buffer. */
3752
3753 if (local_scan_data)
3754 {
3755 int len = Ustrlen(local_scan_data);
3756 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3757 local_scan_data = string_copyn(local_scan_data, len);
3758 }
3759
3760 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3761 {
3762 if (!f.deliver_freeze) /* ACL might have already frozen */
3763 {
3764 f.deliver_freeze = TRUE;
3765 deliver_frozen_at = time(NULL);
3766 frozen_by = US"local_scan()";
3767 }
3768 rc = LOCAL_SCAN_ACCEPT;
3769 }
3770 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3771 {
3772 if (!f.queue_only_policy) /* ACL might have already queued */
3773 {
3774 f.queue_only_policy = TRUE;
3775 queued_by = US"local_scan()";
3776 }
3777 rc = LOCAL_SCAN_ACCEPT;
3778 }
3779
3780 /* Message accepted: remove newlines in local_scan_data because otherwise
3781 the spool file gets corrupted. Ensure that all recipients are qualified. */
3782
3783 if (rc == LOCAL_SCAN_ACCEPT)
3784 {
3785 if (local_scan_data)
3786 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3787 for (int i = 0; i < recipients_count; i++)
3788 {
3789 recipient_item *r = recipients_list + i;
3790 r->address = rewrite_address_qualify(r->address, TRUE);
3791 if (r->errors_to)
3792 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3793 }
3794 if (recipients_count == 0 && !blackholed_by)
3795 blackholed_by = US"local_scan";
3796 }
3797
3798 /* Message rejected: newlines permitted in local_scan_data to generate
3799 multiline SMTP responses. */
3800
3801 else
3802 {
3803 uschar *istemp = US"";
3804 uschar *smtp_code;
3805 gstring * g;
3806
3807 errmsg = local_scan_data;
3808
3809 Uunlink(spool_name); /* Cancel this message */
3810 switch(rc)
3811 {
3812 default:
3813 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3814 "rejection given", rc);
3815 goto TEMPREJECT;
3816
3817 case LOCAL_SCAN_REJECT_NOLOGHDR:
3818 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3819 /* Fall through */
3820
3821 case LOCAL_SCAN_REJECT:
3822 smtp_code = US"550";
3823 if (!errmsg) errmsg = US"Administrative prohibition";
3824 break;
3825
3826 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3827 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3828 /* Fall through */
3829
3830 case LOCAL_SCAN_TEMPREJECT:
3831 TEMPREJECT:
3832 smtp_code = US"451";
3833 if (!errmsg) errmsg = US"Temporary local problem";
3834 istemp = US"temporarily ";
3835 break;
3836 }
3837
3838 g = string_append(NULL, 2, US"F=",
3839 sender_address[0] == 0 ? US"<>" : sender_address);
3840 g = add_host_info_for_log(g);
3841
3842 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3843 string_from_gstring(g), istemp, string_printing(errmsg));
3844
3845 if (smtp_input)
3846 if (!smtp_batched_input)
3847 {
3848 smtp_respond(smtp_code, 3, TRUE, errmsg);
3849 message_id[0] = 0; /* Indicate no message accepted */
3850 smtp_reply = US""; /* Indicate reply already sent */
3851 goto TIDYUP; /* Skip to end of function */
3852 }
3853 else
3854 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3855 /* Does not return */
3856 else
3857 {
3858 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3859 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3860 US"message rejected by local scan code: ", error_rc, spool_data_file,
3861 header_list);
3862 /* Does not return */
3863 }
3864 }
3865
3866 /* Reset signal handlers to ignore signals that previously would have caused
3867 the message to be abandoned. */
3868
3869 signal(SIGTERM, SIG_IGN);
3870 signal(SIGINT, SIG_IGN);
3871 #endif /* HAVE_LOCAL_SCAN */
3872
3873
3874 /* Ensure the first time flag is set in the newly-received message. */
3875
3876 f.deliver_firsttime = TRUE;
3877
3878 #ifdef EXPERIMENTAL_BRIGHTMAIL
3879 if (bmi_run == 1)
3880 { /* rewind data file */
3881 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3882 bmi_verdicts = bmi_process_message(header_list, data_fd);
3883 }
3884 #endif
3885
3886 /* Update the timestamp in our Received: header to account for any time taken by
3887 an ACL or by local_scan(). The new time is the time that all reception
3888 processing is complete. */
3889
3890 timestamp = expand_string(US"${tod_full}");
3891 tslen = Ustrlen(timestamp);
3892
3893 memcpy(received_header->text + received_header->slen - tslen - 1,
3894 timestamp, tslen);
3895
3896 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3897
3898 if (mua_wrapper)
3899 {
3900 f.deliver_freeze = FALSE;
3901 f.queue_only_policy = FALSE;
3902 }
3903
3904 /* Keep the data file open until we have written the header file, in order to
3905 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3906 don't write the header file, and we unlink the data file. If writing the header
3907 file fails, we have failed to accept this message. */
3908
3909 if (host_checking || blackholed_by)
3910 {
3911 Uunlink(spool_name);
3912 msg_size = 0; /* Compute size for log line */
3913 for (header_line * h = header_list; h; h = h->next)
3914 if (h->type != '*') msg_size += h->slen;
3915 }
3916
3917 /* Write the -H file */
3918
3919 else
3920 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3921 {
3922 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3923 Uunlink(spool_name); /* Lose the data file */
3924
3925 if (smtp_input)
3926 {
3927 smtp_reply = US"451 Error in writing spool file";
3928 message_id[0] = 0; /* Indicate no message accepted */
3929 goto TIDYUP;
3930 }
3931 else
3932 {
3933 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3934 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3935 header_list);
3936 /* Does not return */
3937 }
3938 }
3939
3940
3941 /* The message has now been successfully received. */
3942
3943 receive_messagecount++;
3944
3945 /* Add data size to written header size. We do not count the initial file name
3946 that is in the file, but we do add one extra for the notional blank line that
3947 precedes the data. This total differs from message_size in that it include the
3948 added Received: header and any other headers that got created locally. */
3949
3950 if (fflush(spool_data_file))
3951 {
3952 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3953 log_write(0, LOG_MAIN, "%s\n", errmsg);
3954 Uunlink(spool_name); /* Lose the data file */
3955
3956 if (smtp_input)
3957 {
3958 smtp_reply = US"451 Error in writing spool file";
3959 message_id[0] = 0; /* Indicate no message accepted */
3960 goto TIDYUP;
3961 }
3962 else
3963 {
3964 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3965 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3966 header_list);
3967 /* Does not return */
3968 }
3969 }
3970 fstat(data_fd, &statbuf);
3971
3972 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3973
3974 /* Generate a "message received" log entry. We do this by building up a dynamic
3975 string as required. We log the arrival of a new message while the
3976 file is still locked, just in case the machine is *really* fast, and delivers
3977 it first! Include any message id that is in the message - since the syntax of a
3978 message id is actually an addr-spec, we can use the parse routine to canonicalize
3979 it. */
3980
3981 rcvd_log_reset_point = store_mark();
3982 g = string_get(256);
3983
3984 g = string_append(g, 2,
3985 fake_response == FAIL ? US"(= " : US"<= ",
3986 sender_address[0] == 0 ? US"<>" : sender_address);
3987 if (message_reference)
3988 g = string_append(g, 2, US" R=", message_reference);
3989
3990 g = add_host_info_for_log(g);
3991
3992 #ifndef DISABLE_TLS
3993 if (LOGGING(tls_cipher) && tls_in.cipher)
3994 {
3995 g = string_append(g, 2, US" X=", tls_in.cipher);
3996 # ifdef EXPERIMENTAL_TLS_RESUME
3997 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
3998 g = string_catn(g, US"*", 1);
3999 # endif
4000 }
4001 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4002 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4003 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4004 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4005 if (LOGGING(tls_sni) && tls_in.sni)
4006 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
4007 #endif
4008
4009 if (sender_host_authenticated)
4010 {
4011 g = string_append(g, 2, US" A=", sender_host_authenticated);
4012 if (authenticated_id)
4013 {
4014 g = string_append(g, 2, US":", authenticated_id);
4015 if (LOGGING(smtp_mailauth) && authenticated_sender)
4016 g = string_append(g, 2, US":", authenticated_sender);
4017 }
4018 }
4019
4020 #ifndef DISABLE_PRDR
4021 if (prdr_requested)
4022 g = string_catn(g, US" PRDR", 5);
4023 #endif
4024
4025 #ifdef SUPPORT_PROXY
4026 if (proxy_session && LOGGING(proxy))
4027 g = string_append(g, 2, US" PRX=", proxy_local_address);
4028 #endif
4029
4030 if (chunking_state > CHUNKING_OFFERED)
4031 g = string_catn(g, US" K", 2);
4032
4033 g = string_fmt_append(g, " S=%d", msg_size);
4034
4035 /* log 8BITMIME mode announced in MAIL_FROM
4036 0 ... no BODY= used
4037 7 ... 7BIT
4038 8 ... 8BITMIME */
4039 if (LOGGING(8bitmime))
4040 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4041
4042 #ifndef DISABLE_DKIM
4043 if (LOGGING(dkim) && dkim_verify_overall)
4044 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4045 # ifdef EXPERIMENTAL_ARC
4046 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4047 g = string_catn(g, US" ARC", 4);
4048 # endif
4049 #endif
4050
4051 if (LOGGING(receive_time))
4052 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
4053
4054 if (*queue_name)
4055 g = string_append(g, 2, US" Q=", queue_name);
4056
4057 /* If an addr-spec in a message-id contains a quoted string, it can contain
4058 any characters except " \ and CR and so in particular it can contain NL!
4059 Therefore, make sure we use a printing-characters only version for the log.
4060 Also, allow for domain literals in the message id. */
4061
4062 if ( LOGGING(msg_id) && msgid_header
4063 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4064 )
4065 {
4066 uschar * old_id;
4067 BOOL save_allow_domain_literals = allow_domain_literals;
4068 allow_domain_literals = TRUE;
4069 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4070 &errmsg, &start, &end, &domain, FALSE);
4071 allow_domain_literals = save_allow_domain_literals;