1 /* $Cambridge: exim/src/src/receive.c,v 1.42 2007/09/28 12:21:57 tom Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2007 */
8 /* See the file NOTICE for conditions of use and distribution. */
10 /* Code for receiving a message and setting up spool files. */
14 #if (defined EXPERIMENTAL_DOMAINKEYS) && (defined EXPERIMENTAL_DKIM)
16 #warning Chaining Domainkeys via DKIM receive functions
17 #define RECEIVE_GETC dkim_receive_getc
18 #define RECEIVE_UNGETC dkim_receive_ungetc
22 #if (defined EXPERIMENTAL_DOMAINKEYS) || (defined EXPERIMENTAL_DKIM)
24 #ifdef EXPERIMENTAL_DOMAINKEYS
25 #warning Using Domainkeys receive functions
26 #define RECEIVE_GETC dk_receive_getc
27 #define RECEIVE_UNGETC dk_receive_ungetc
29 #ifdef EXPERIMENTAL_DKIM
30 #warning Using DKIM receive functions
31 #define RECEIVE_GETC dkim_receive_getc
32 #define RECEIVE_UNGETC dkim_receive_ungetc
37 /* Normal operation */
38 #define RECEIVE_GETC receive_getc
39 #define RECEIVE_UNGETC receive_ungetc
46 /*************************************************
47 * Local static variables *
48 *************************************************/
50 static FILE *data_file = NULL;
51 static int data_fd = -1;
52 static uschar spool_name[256];
56 /*************************************************
57 * Non-SMTP character reading functions *
58 *************************************************/
60 /* These are the default functions that are set up in the variables such as
61 receive_getc initially. They just call the standard functions, passing stdin as
62 the file. (When SMTP input is occurring, different functions are used by
63 changing the pointer variables.) */
74 return ungetc(c, stdin);
92 /*************************************************
93 * Check that a set sender is allowed *
94 *************************************************/
96 /* This function is called when a local caller sets an explicit sender address.
97 It checks whether this is permitted, which it is for trusted callers.
98 Otherwise, it must match the pattern(s) in untrusted_set_sender.
100 Arguments: the proposed sender address
101 Returns: TRUE for a trusted caller
102 TRUE if the address has been set, untrusted_set_sender has been
103 set, and the address matches something in the list
108 receive_check_set_sender(uschar *newsender)
111 if (trusted_caller) return TRUE;
112 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
113 qnewsender = (Ustrchr(newsender, '@') != NULL)?
114 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
116 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
123 /*************************************************
124 * Read space info for a partition *
125 *************************************************/
127 /* This function is called by receive_check_fs() below, and also by string
128 expansion for variables such as $spool_space. The field names for the statvfs
129 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
130 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
131 have inodes, and they return -1 for the number available.
133 Later: It turns out that some file systems that do not have the concept of
134 inodes return 0 rather than -1. Such systems should also return 0 for the total
135 number of inodes, so we require that to be greater than zero before returning
139 isspool TRUE for spool partition, FALSE for log partition
140 inodeptr address of int to receive inode count; -1 if there isn't one
142 Returns: available on-root space, in kilobytes
143 -1 for log partition if there isn't one
145 All values are -1 if the STATFS functions are not available.
149 receive_statvfs(BOOL isspool, int *inodeptr)
152 struct STATVFS statbuf;
157 /* The spool directory must always exist. */
161 path = spool_directory;
165 /* Need to cut down the log file path to the directory, and to ignore any
166 appearance of "syslog" in it. */
170 int sep = ':'; /* Not variable - outside scripts use */
171 uschar *p = log_file_path;
174 /* An empty log_file_path means "use the default". This is the same as an
175 empty item in a list. */
177 if (*p == 0) p = US":";
178 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
180 if (Ustrcmp(path, "syslog") != 0) break;
183 if (path == NULL) /* No log files */
189 /* An empty string means use the default, which is in the spool directory.
190 But don't just use the spool directory, as it is possible that the log
191 subdirectory has been symbolically linked elsewhere. */
195 sprintf(CS buffer, CS"%s/log", CS spool_directory);
201 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
205 /* We now have the path; do the business */
207 memset(&statbuf, 0, sizeof(statbuf));
209 if (STATVFS(CS path, &statbuf) != 0)
211 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
212 "%s directory %s: %s", name, spool_directory, strerror(errno));
213 smtp_closedown(US"spool or log directory problem");
214 exim_exit(EXIT_FAILURE);
217 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
219 /* Disks are getting huge. Take care with computing the size in kilobytes. */
221 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
223 /* Unable to find partition sizes in this environment. */
234 /*************************************************
235 * Check space on spool and log partitions *
236 *************************************************/
238 /* This function is called before accepting a message; if any thresholds are
239 set, it checks them. If a message_size is supplied, it checks that there is
240 enough space for that size plus the threshold - i.e. that the message won't
241 reduce the space to the threshold. Not all OS have statvfs(); for those that
242 don't, this function always returns TRUE. For some OS the old function and
243 struct name statfs is used; that is handled by a macro, defined in exim.h.
246 msg_size the (estimated) size of an incoming message
248 Returns: FALSE if there isn't enough space, or if the information cannot
250 TRUE if no check was done or there is enough space
254 receive_check_fs(int msg_size)
258 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
260 space = receive_statvfs(TRUE, &inodes);
263 debug_printf("spool directory space = %dK inodes = %d "
264 "check_space = %dK inodes = %d msg_size = %d\n",
265 space, inodes, check_spool_space, check_spool_inodes, msg_size);
267 if ((space >= 0 && space < check_spool_space) ||
268 (inodes >= 0 && inodes < check_spool_inodes))
270 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
271 "inodes=%d", space, inodes);
276 if (check_log_space > 0 || check_log_inodes > 0)
278 space = receive_statvfs(FALSE, &inodes);
281 debug_printf("log directory space = %dK inodes = %d "
282 "check_space = %dK inodes = %d\n",
283 space, inodes, check_log_space, check_log_inodes);
285 if ((space >= 0 && space < check_log_space) ||
286 (inodes >= 0 && inodes < check_log_inodes))
288 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
289 "inodes=%d", space, inodes);
299 /*************************************************
300 * Bomb out while reading a message *
301 *************************************************/
303 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
304 received, or if there is a timeout. A rarer case might be if the log files are
305 screwed up and Exim can't open them to record a message's arrival. Handling
306 that case is done by setting a flag to cause the log functions to call this
307 function if there is an ultimate disaster. That is why it is globally
311 reason text reason to pass to the not-quit ACL
312 msg default SMTP response to give if in an SMTP session
317 receive_bomb_out(uschar *reason, uschar *msg)
319 /* If spool_name is set, it contains the name of the data file that is being
320 written. Unlink it before closing so that it cannot be picked up by a delivery
321 process. Ensure that any header file is also removed. */
323 if (spool_name[0] != 0)
326 spool_name[Ustrlen(spool_name) - 1] = 'H';
330 /* Now close the file if it is open, either as a fd or a stream. */
332 if (data_file != NULL) (void)fclose(data_file);
333 else if (data_fd >= 0) (void)close(data_fd);
335 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
336 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
341 if (smtp_batched_input)
342 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
343 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
344 smtp_active_hostname, msg);
347 /* Exit from the program (non-BSMTP cases) */
349 exim_exit(EXIT_FAILURE);
353 /*************************************************
354 * Data read timeout *
355 *************************************************/
357 /* Handler function for timeouts that occur while reading the data that
360 Argument: the signal number
365 data_timeout_handler(int sig)
369 sig = sig; /* Keep picky compilers happy */
373 msg = US"SMTP incoming data timeout";
374 log_write(L_lost_incoming_connection,
375 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
377 (sender_fullhost != NULL)? sender_fullhost : US"local process",
382 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
383 log_write(L_lost_incoming_connection,
384 LOG_MAIN, "timed out while reading local message");
387 receive_bomb_out(US"data-timeout", msg); /* Does not return */
392 /*************************************************
393 * local_scan() timeout *
394 *************************************************/
396 /* Handler function for timeouts that occur while running a local_scan()
399 Argument: the signal number
404 local_scan_timeout_handler(int sig)
406 sig = sig; /* Keep picky compilers happy */
407 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
408 "message temporarily rejected (size %d)", message_size);
409 /* Does not return */
410 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
415 /*************************************************
416 * local_scan() crashed *
417 *************************************************/
419 /* Handler function for signals that occur while running a local_scan()
422 Argument: the signal number
427 local_scan_crash_handler(int sig)
429 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
430 "signal %d - message temporarily rejected (size %d)", sig, message_size);
431 /* Does not return */
432 receive_bomb_out(US"local-scan-error", US"local verification problem");
436 /*************************************************
437 * SIGTERM or SIGINT received *
438 *************************************************/
440 /* Handler for SIGTERM or SIGINT signals that occur while reading the
441 data that comprises a message.
443 Argument: the signal number
448 data_sigterm_sigint_handler(int sig)
454 msg = US"Service not available - SIGTERM or SIGINT received";
455 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
456 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
460 if (filter_test == FTEST_NONE)
462 fprintf(stderr, "\nexim: %s received - message abandoned\n",
463 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
464 log_write(0, LOG_MAIN, "%s received while reading local message",
465 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
469 receive_bomb_out(US"signal-exit", msg); /* Does not return */
474 /*************************************************
475 * Add new recipient to list *
476 *************************************************/
478 /* This function builds a list of recipient addresses in argc/argv
482 recipient the next address to add to recipients_list
483 pno parent number for fixed aliases; -1 otherwise
489 receive_add_recipient(uschar *recipient, int pno)
491 if (recipients_count >= recipients_list_max)
493 recipient_item *oldlist = recipients_list;
494 int oldmax = recipients_list_max;
495 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
496 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
498 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
501 recipients_list[recipients_count].address = recipient;
502 recipients_list[recipients_count].pno = pno;
503 #ifdef EXPERIMENTAL_BRIGHTMAIL
504 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
505 /* reset optin string pointer for next recipient */
506 bmi_current_optin = NULL;
508 recipients_list[recipients_count++].errors_to = NULL;
514 /*************************************************
515 * Remove a recipient from the list *
516 *************************************************/
518 /* This function is provided for local_scan() to use.
521 recipient address to remove
523 Returns: TRUE if it did remove something; FALSE otherwise
527 receive_remove_recipient(uschar *recipient)
530 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
532 for (count = 0; count < recipients_count; count++)
534 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
536 if ((--recipients_count - count) > 0)
537 memmove(recipients_list + count, recipients_list + count + 1,
538 (recipients_count - count)*sizeof(recipient_item));
549 /*************************************************
550 * Read data portion of a non-SMTP message *
551 *************************************************/
553 /* This function is called to read the remainder of a message (following the
554 header) when the input is not from SMTP - we are receiving a local message on
555 a standard input stream. The message is always terminated by EOF, and is also
556 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
557 two cases for maximum efficiency.
559 Ensure that the body ends with a newline. This will naturally be the case when
560 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
561 as "sequences of lines" - this of course strictly applies only to SMTP, but
562 deliveries into BSD-type mailbox files also require it. Exim used to have a
563 flag for doing this at delivery time, but as it was always set for all
564 transports, I decided to simplify things by putting the check here instead.
566 There is at least one MUA (dtmail) that sends CRLF via this interface, and
567 other programs are known to do this as well. Exim used to have a option for
568 dealing with this: in July 2003, after much discussion, the code has been
569 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
571 However, for the case when a dot on a line by itself terminates a message, the
572 only recognized terminating sequences before and after the dot are LF and CRLF.
573 Otherwise, having read EOL . CR, you don't know whether to read another
576 Internally, in messages stored in Exim's spool files, LF is used as the line
577 terminator. Under the new regime, bare CRs will no longer appear in these
581 fout a FILE to which to write the message
583 Returns: One of the END_xxx values indicating why it stopped reading
587 read_message_data(FILE *fout)
591 register int linelength = 0;
593 /* Handle the case when only EOF terminates the message */
597 register int last_ch = '\n';
599 for (; (ch = (RECEIVE_GETC)()) != EOF; last_ch = ch)
601 if (ch == 0) body_zerocount++;
602 if (last_ch == '\r' && ch != '\n')
604 if (linelength > max_received_linelength)
605 max_received_linelength = linelength;
607 if (fputc('\n', fout) == EOF) return END_WERROR;
611 if (ch == '\r') continue;
613 if (fputc(ch, fout) == EOF) return END_WERROR;
616 if (linelength > max_received_linelength)
617 max_received_linelength = linelength;
622 if (++message_size > thismessage_size_limit) return END_SIZE;
627 if (linelength > max_received_linelength)
628 max_received_linelength = linelength;
629 if (fputc('\n', fout) == EOF) return END_WERROR;
637 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
641 while ((ch = (RECEIVE_GETC)()) != EOF)
643 if (ch == 0) body_zerocount++;
646 case 0: /* Normal state (previous char written) */
650 if (linelength > max_received_linelength)
651 max_received_linelength = linelength;
656 { ch_state = 2; continue; }
659 case 1: /* After written "\n" */
660 if (ch == '.') { ch_state = 3; continue; }
661 if (ch != '\n') ch_state = 0; else linelength = -1;
665 body_linecount++; /* After unwritten "\r" */
666 if (linelength > max_received_linelength)
667 max_received_linelength = linelength;
675 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
676 if (ch == '\r') continue;
682 case 3: /* After "\n." (\n written, dot not) */
683 if (ch == '\n') return END_DOT;
684 if (ch == '\r') { ch_state = 4; continue; }
687 if (fputc('.', fout) == EOF) return END_WERROR;
691 case 4: /* After "\n.\r" (\n written, rest not) */
692 if (ch == '\n') return END_DOT;
695 if (fputs(".\n", fout) == EOF) return END_WERROR;
696 if (ch == '\r') { ch_state = 2; continue; }
702 if (fputc(ch, fout) == EOF) return END_WERROR;
703 if (++message_size > thismessage_size_limit) return END_SIZE;
706 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
707 the message ends with a newline, and we must also write any characters that
708 were saved up while testing for an ending dot. */
712 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
713 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
714 message_size += Ustrlen(ends[ch_state]);
724 /*************************************************
725 * Read data portion of an SMTP message *
726 *************************************************/
728 /* This function is called to read the remainder of an SMTP message (after the
729 headers), or to skip over it when an error has occurred. In this case, the
730 output file is passed as NULL.
732 If any line begins with a dot, that character is skipped. The input should only
733 be successfully terminated by CR LF . CR LF unless it is local (non-network)
734 SMTP, in which case the CRs are optional, but...
736 FUDGE: It seems that sites on the net send out messages with just LF
737 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
738 we make the CRs optional in all cases.
740 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
741 well, so that there are no CRs in spooled messages. However, the message
742 terminating dot is not recognized between two bare CRs.
745 fout a FILE to which to write the message; NULL if skipping
747 Returns: One of the END_xxx values indicating why it stopped reading
751 read_message_data_smtp(FILE *fout)
755 register int linelength = 0;
757 while ((ch = (RECEIVE_GETC)()) != EOF)
759 if (ch == 0) body_zerocount++;
762 case 0: /* After LF or CRLF */
766 continue; /* Don't ever write . after LF */
770 /* Else fall through to handle as normal uschar. */
772 case 1: /* Normal state */
777 if (linelength > max_received_linelength)
778 max_received_linelength = linelength;
788 case 2: /* After (unwritten) CR */
790 if (linelength > max_received_linelength)
791 max_received_linelength = linelength;
800 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
801 if (ch != '\r') ch_state = 1; else continue;
805 case 3: /* After [CR] LF . */
813 ch_state = 1; /* The dot itself is removed */
816 case 4: /* After [CR] LF . CR */
817 if (ch == '\n') return END_DOT;
820 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
830 /* Add the character to the spool file, unless skipping; then loop for the
837 if (fputc(ch, fout) == EOF) return END_WERROR;
838 if (message_size > thismessage_size_limit) return END_SIZE;
842 /* Fall through here if EOF encountered. This indicates some kind of error,
843 since a correct message is terminated by [CR] LF . [CR] LF. */
851 /*************************************************
852 * Swallow SMTP message *
853 *************************************************/
855 /* This function is called when there has been some kind of error while reading
856 an SMTP message, and the remaining data may need to be swallowed. It is global
857 because it is called from smtp_closedown() to shut down an incoming call
860 Argument: a FILE from which to read the message
865 receive_swallow_smtp(void)
867 if (message_ended >= END_NOTENDED)
868 message_ended = read_message_data_smtp(NULL);
873 /*************************************************
874 * Handle lost SMTP connection *
875 *************************************************/
877 /* This function logs connection loss incidents and generates an appropriate
880 Argument: additional data for the message
881 Returns: the SMTP response
885 handle_lost_connection(uschar *s)
887 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
888 "%s lost while reading message data%s", smtp_get_connection_info(), s);
889 return US"421 Lost incoming connection";
895 /*************************************************
896 * Handle a non-smtp reception error *
897 *************************************************/
899 /* This function is called for various errors during the reception of non-SMTP
900 messages. It either sends a message to the sender of the problem message, or it
901 writes to the standard error stream.
904 errcode code for moan_to_sender(), identifying the error
905 text1 first message text, passed to moan_to_sender()
906 text2 second message text, used only for stderrr
907 error_rc code to pass to exim_exit if no problem
908 f FILE containing body of message (may be stdin)
909 hptr pointer to instore headers or NULL
911 Returns: calls exim_exit(), which does not return
915 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
916 FILE *f, header_line *hptr)
918 if (error_handling == ERRORS_SENDER)
922 eblock.text1 = text1;
923 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
924 error_rc = EXIT_FAILURE;
926 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
933 /*************************************************
934 * Add header lines set up by ACL *
935 *************************************************/
937 /* This function is called to add the header lines that were set up by
938 statements in an ACL to the list of headers in memory. It is done in two stages
939 like this, because when the ACL for RCPT is running, the other headers have not
940 yet been received. This function is called twice; once just before running the
941 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
942 are visible to the DATA ACL.
944 Originally these header lines were added at the end. Now there is support for
945 three different places: top, bottom, and after the Received: header(s). There
946 will always be at least one Received: header, even if it is marked deleted, and
947 even if something else has been put in front of it.
950 acl_name text to identify which ACL
956 add_acl_headers(uschar *acl_name)
958 header_line *h, *next;
959 header_line *last_received = NULL;
961 if (acl_added_headers == NULL) return;
962 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
964 for (h = acl_added_headers; h != NULL; h = next)
971 h->next = header_list;
973 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
977 if (last_received == NULL)
979 last_received = header_list;
980 while (!header_testname(last_received, US"Received", 8, FALSE))
981 last_received = last_received->next;
982 while (last_received->next != NULL &&
983 header_testname(last_received->next, US"Received", 8, FALSE))
984 last_received = last_received->next;
986 h->next = last_received->next;
987 last_received->next = h;
988 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
992 /* add header before any header which is NOT Received: or Resent- */
993 last_received = header_list;
994 while ( (last_received->next != NULL) &&
995 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
996 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
997 last_received = last_received->next;
998 /* last_received now points to the last Received: or Resent-* header
999 in an uninterrupted chain of those header types (seen from the beginning
1000 of all headers. Our current header must follow it. */
1001 h->next = last_received->next;
1002 last_received->next = h;
1003 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1008 header_last->next = h;
1012 if (h->next == NULL) header_last = h;
1014 /* Check for one of the known header types (From:, To:, etc.) though in
1015 practice most added headers are going to be "other". Lower case
1016 identification letters are never stored with the header; they are used
1017 for existence tests when messages are received. So discard any lower case
1020 h->type = header_checkname(h, FALSE);
1021 if (h->type >= 'a') h->type = htype_other;
1023 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1026 acl_added_headers = NULL;
1027 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1032 /*************************************************
1033 * Add host information for log line *
1034 *************************************************/
1036 /* Called for acceptance and rejecting log lines. This adds information about
1037 the calling host to a string that is being built dynamically.
1040 s the dynamic string
1041 sizeptr points to the size variable
1042 ptrptr points to the pointer variable
1044 Returns: the extended string
1048 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1050 if (sender_fullhost != NULL)
1052 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1053 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1054 interface_address != NULL)
1056 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1058 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1061 if (sender_ident != NULL)
1062 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1063 if (received_protocol != NULL)
1064 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1070 #ifdef WITH_CONTENT_SCAN
1072 /*************************************************
1073 * Run the MIME ACL on a message *
1074 *************************************************/
1076 /* This code is in a subroutine so that it can be used for both SMTP
1077 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1080 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1081 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1082 smtp_reply_ptr Where SMTP reply is being built
1083 blackholed_by_ptr Where "blackholed by" message is being built
1085 Returns: TRUE to carry on; FALSE to abandon the message
1089 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1090 uschar **blackholed_by_ptr)
1093 uschar rfc822_file_path[2048];
1094 unsigned long mbox_size;
1095 header_line *my_headerlist;
1096 uschar *user_msg, *log_msg;
1097 int mime_part_count_buffer = -1;
1100 memset(CS rfc822_file_path,0,2048);
1102 /* check if it is a MIME message */
1103 my_headerlist = header_list;
1104 while (my_headerlist != NULL)
1106 /* skip deleted headers */
1107 if (my_headerlist->type == '*')
1109 my_headerlist = my_headerlist->next;
1112 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1114 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1117 my_headerlist = my_headerlist->next;
1120 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1124 /* make sure the eml mbox file is spooled up */
1125 mbox_file = spool_mbox(&mbox_size);
1126 if (mbox_file == NULL) {
1127 /* error while spooling */
1128 log_write(0, LOG_MAIN|LOG_PANIC,
1129 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1130 Uunlink(spool_name);
1132 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1133 message_id[0] = 0; /* Indicate no message accepted */
1134 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1135 return FALSE; /* Indicate skip to end of receive function */
1141 mime_part_count = -1;
1142 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1143 (void)fclose(mbox_file);
1145 if (Ustrlen(rfc822_file_path) > 0)
1147 mime_part_count = mime_part_count_buffer;
1149 if (unlink(CS rfc822_file_path) == -1)
1151 log_write(0, LOG_PANIC,
1152 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1157 /* check if we must check any message/rfc822 attachments */
1160 uschar temp_path[1024];
1162 struct dirent *entry;
1165 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1168 tempdir = opendir(CS temp_path);
1172 entry = readdir(tempdir);
1173 if (entry == NULL) break;
1174 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1176 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1177 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1185 mbox_file = Ufopen(rfc822_file_path,"rb");
1186 if (mbox_file == NULL)
1188 log_write(0, LOG_PANIC,
1189 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1190 unlink(CS rfc822_file_path);
1193 /* set RFC822 expansion variable */
1195 mime_part_count_buffer = mime_part_count;
1196 goto MIME_ACL_CHECK;
1201 add_acl_headers(US"MIME");
1204 recipients_count = 0;
1205 *blackholed_by_ptr = US"MIME ACL";
1209 Uunlink(spool_name);
1211 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1212 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1213 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1214 message_id[0] = 0; /* Indicate no message accepted */
1215 return FALSE; /* Cause skip to end of receive function */
1221 #endif /* WITH_CONTENT_SCAN */
1224 /*************************************************
1226 *************************************************/
1228 /* Receive a message on the given input, and put it into a pair of spool files.
1229 Either a non-null list of recipients, or the extract flag will be true, or
1230 both. The flag sender_local is true for locally generated messages. The flag
1231 submission_mode is true if an ACL has obeyed "control = submission". The flag
1232 suppress_local_fixups is true if an ACL has obeyed "control =
1233 suppress_local_fixups". The flag smtp_input is true if the message is to be
1234 handled using SMTP conventions about termination and lines starting with dots.
1235 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1237 If a message was successfully read, message_id[0] will be non-zero.
1239 The general actions of this function are:
1241 . Read the headers of the message (if any) into a chain of store
1244 . If there is a "sender:" header and the message is locally originated,
1245 throw it away, unless the caller is trusted, or unless
1246 active_local_sender_retain is set - which can only happen if
1247 active_local_from_check is false.
1249 . If recipients are to be extracted from the message, build the
1250 recipients list from the headers, removing any that were on the
1251 original recipients list (unless extract_addresses_remove_arguments is
1252 false), and at the same time, remove any bcc header that may be present.
1254 . Get the spool file for the data, sort out its unique name, open
1255 and lock it (but don't give it the name yet).
1257 . Generate a "Message-Id" header if the message doesn't have one, for
1258 locally-originated messages.
1260 . Generate a "Received" header.
1262 . Ensure the recipients list is fully qualified and rewritten if necessary.
1264 . If there are any rewriting rules, apply them to the sender address
1265 and also to the headers.
1267 . If there is no from: header, generate one, for locally-generated messages
1268 and messages in "submission mode" only.
1270 . If the sender is local, check that from: is correct, and if not, generate
1271 a Sender: header, unless message comes from a trusted caller, or this
1272 feature is disabled by active_local_from_check being false.
1274 . If there is no "date" header, generate one, for locally-originated
1275 or submission mode messages only.
1277 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1278 dot_ends mode, to the data file. Leave it open, to hold the lock.
1280 . Write the envelope and the headers to a new file.
1282 . Set the name for the header file; close it.
1284 . Set the name for the data file; close it.
1286 Because this function can potentially be called many times in a single
1287 SMTP connection, all store should be got by store_get(), so that it will be
1288 automatically retrieved after the message is accepted.
1290 FUDGE: It seems that sites on the net send out messages with just LF
1291 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1292 we make the CRs optional in all cases.
1294 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1295 new regime is now in place in which bare CRs in header lines are turned into LF
1296 followed by a space, so as not to terminate the header line.
1298 February 2004: A bare LF in a header line in a message whose first line was
1299 terminated by CRLF is treated in the same way as a bare CR.
1302 extract_recip TRUE if recipients are to be extracted from the message's
1305 Returns: TRUE there are more messages to be read (SMTP input)
1306 FALSE there are no more messages to be read (non-SMTP input
1307 or SMTP connection collapsed, or other failure)
1309 When reading a message for filter testing, the returned value indicates
1310 whether the headers (which is all that is read) were terminated by '.' or
1314 receive_msg(BOOL extract_recip)
1318 int process_info_len = Ustrlen(process_info);
1319 int error_rc = (error_handling == ERRORS_SENDER)?
1320 errors_sender_rc : EXIT_FAILURE;
1321 int header_size = 256;
1322 int start, end, domain, size, sptr;
1325 int prevlines_length = 0;
1327 register int ptr = 0;
1329 BOOL contains_resent_headers = FALSE;
1330 BOOL extracted_ignored = FALSE;
1331 BOOL first_line_ended_crlf = TRUE_UNSET;
1332 BOOL smtp_yield = TRUE;
1335 BOOL resents_exist = FALSE;
1336 uschar *resent_prefix = US"";
1337 uschar *blackholed_by = NULL;
1338 uschar *blackhole_log_msg = US"";
1341 error_block *bad_addresses = NULL;
1343 uschar *frozen_by = NULL;
1344 uschar *queued_by = NULL;
1347 struct stat statbuf;
1349 /* Final message to give to SMTP caller, and messages from ACLs */
1351 uschar *smtp_reply = NULL;
1352 uschar *user_msg, *log_msg;
1354 /* Working header pointers */
1356 header_line *h, *next;
1358 /* Flags for noting the existence of certain headers (only one left) */
1360 BOOL date_header_exists = FALSE;
1362 /* Pointers to receive the addresses of headers whose contents we need. */
1364 header_line *from_header = NULL;
1365 header_line *subject_header = NULL;
1366 header_line *msgid_header = NULL;
1367 header_line *received_header;
1369 /* Variables for use when building the Received: header. */
1375 /* Release any open files that might have been cached while preparing to
1376 accept the message - e.g. by verifying addresses - because reading a message
1377 might take a fair bit of real time. */
1381 /* Initialize the chain of headers by setting up a place-holder for Received:
1382 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1383 pointing to the end of the chain to make adding headers simple. */
1385 received_header = header_list = header_last = store_get(sizeof(header_line));
1386 header_list->next = NULL;
1387 header_list->type = htype_old;
1388 header_list->text = NULL;
1389 header_list->slen = 0;
1391 /* Control block for the next header to be read. */
1393 next = store_get(sizeof(header_line));
1394 next->text = store_get(header_size);
1396 /* Initialize message id to be null (indicating no message read), and the
1397 header names list to be the normal list. Indicate there is no data file open
1398 yet, initialize the size and warning count, and deal with no size limit. */
1406 received_count = 1; /* For the one we will add */
1408 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1410 /* While reading the message, the following counts are computed. */
1412 message_linecount = body_linecount = body_zerocount =
1413 max_received_linelength = 0;
1415 #ifdef EXPERIMENTAL_DOMAINKEYS
1416 /* Call into DK to set up the context. Check if DK is to be run are carried out
1417 inside dk_exim_verify_init(). */
1418 dk_exim_verify_init();
1420 #ifdef EXPERIMENTAL_DKIM
1421 /* Call into DKIM to set up the context. Check if DKIM is to be run are carried out
1422 inside dk_exim_verify_init(). */
1423 dkim_exim_verify_init();
1427 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1428 ids, and fractions of a second are required. See the comments that precede the
1429 message id creation below. */
1431 (void)gettimeofday(&message_id_tv, NULL);
1433 /* For other uses of the received time we can operate with granularity of one
1434 second, and for that we use the global variable received_time. This is for
1435 things like ultimate message timeouts. */
1437 received_time = message_id_tv.tv_sec;
1439 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1440 happen in the smtp_getc() function when it refills its buffer. */
1442 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1444 /* If not SMTP input, timeout happens only if configured, and we just set a
1445 single timeout for the whole message. */
1447 else if (receive_timeout > 0)
1449 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1450 alarm(receive_timeout);
1453 /* SIGTERM and SIGINT are caught always. */
1455 signal(SIGTERM, data_sigterm_sigint_handler);
1456 signal(SIGINT, data_sigterm_sigint_handler);
1458 /* Header lines in messages are not supposed to be very long, though when
1459 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1460 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1461 storing the header, and extend this as necessary using string_cat().
1463 To cope with total lunacies, impose an upper limit on the length of the header
1464 section of the message, as otherwise the store will fill up. We must also cope
1465 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1466 Folded header lines are joined into one string, leaving the '\n' characters
1467 inside them, so that writing them out reproduces the input.
1469 Loop for each character of each header; the next structure for chaining the
1470 header is set up already, with ptr the offset of the next character in
1475 int ch = (RECEIVE_GETC)();
1477 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1478 SMTP must have a correct "." terminator. */
1480 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1482 smtp_reply = handle_lost_connection(US" (header)");
1484 goto TIDYUP; /* Skip to end of function */
1487 /* See if we are at the current header's size limit - there must be at least
1488 four bytes left. This allows for the new character plus a zero, plus two for
1489 extra insertions when we are playing games with dots and carriage returns. If
1490 we are at the limit, extend the text buffer. This could have been done
1491 automatically using string_cat() but because this is a tightish loop storing
1492 only one character at a time, we choose to do it inline. Normally
1493 store_extend() will be able to extend the block; only at the end of a big
1494 store block will a copy be needed. To handle the case of very long headers
1495 (and sometimes lunatic messages can have ones that are 100s of K long) we
1496 call store_release() for strings that have been copied - if the string is at
1497 the start of a block (and therefore the only thing in it, because we aren't
1498 doing any other gets), the block gets freed. We can only do this because we
1499 know there are no other calls to store_get() going on. */
1501 if (ptr >= header_size - 4)
1503 int oldsize = header_size;
1504 /* header_size += 256; */
1506 if (!store_extend(next->text, oldsize, header_size))
1508 uschar *newtext = store_get(header_size);
1509 memcpy(newtext, next->text, ptr);
1510 store_release(next->text);
1511 next->text = newtext;
1515 /* Cope with receiving a binary zero. There is dispute about whether
1516 these should be allowed in RFC 822 messages. The middle view is that they
1517 should not be allowed in headers, at least. Exim takes this attitude at
1518 the moment. We can't just stomp on them here, because we don't know that
1519 this line is a header yet. Set a flag to cause scanning later. */
1521 if (ch == 0) had_zero++;
1523 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1524 those from data files use just LF. Treat LF in local SMTP input as a
1525 terminator too. Treat EOF as a line terminator always. */
1527 if (ch == EOF) goto EOL;
1529 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1530 other MTAs accept this. We are therefore forced into this "liberalisation"
1531 too, so we accept LF as a line terminator whatever the source of the message.
1532 However, if the first line of the message ended with a CRLF, we treat a bare
1533 LF specially by inserting a white space after it to ensure that the header
1534 line is not terminated. */
1538 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1539 else if (first_line_ended_crlf) RECEIVE_UNGETC(' ');
1543 /* This is not the end of the line. If this is SMTP input and this is
1544 the first character in the line and it is a "." character, ignore it.
1545 This implements the dot-doubling rule, though header lines starting with
1546 dots aren't exactly common. They are legal in RFC 822, though. If the
1547 following is CRLF or LF, this is the line that that terminates the
1548 entire message. We set message_ended to indicate this has happened (to
1549 prevent further reading), and break out of the loop, having freed the
1550 empty header, and set next = NULL to indicate no data line. */
1552 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1554 ch = (RECEIVE_GETC)();
1557 ch = (RECEIVE_GETC)();
1561 ch = '\r'; /* Revert to CR */
1566 message_ended = END_DOT;
1569 break; /* End character-reading loop */
1572 /* For non-SMTP input, the dot at the start of the line was really a data
1573 character. What is now in ch is the following character. We guaranteed
1574 enough space for this above. */
1578 next->text[ptr++] = '.';
1583 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1584 remember this case if this is the first line ending. */
1588 ch = (RECEIVE_GETC)();
1591 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1595 /* Otherwise, put back the character after CR, and turn the bare CR
1598 ch = (RECEIVE_UNGETC)(ch);
1599 next->text[ptr++] = '\n';
1604 /* We have a data character for the header line. */
1606 next->text[ptr++] = ch; /* Add to buffer */
1607 message_size++; /* Total message size so far */
1609 /* Handle failure due to a humungously long header section. The >= allows
1610 for the terminating \n. Add what we have so far onto the headers list so
1611 that it gets reflected in any error message, and back up the just-read
1614 if (message_size >= header_maxsize)
1616 next->text[ptr] = 0;
1618 next->type = htype_other;
1620 header_last->next = next;
1623 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1624 "%s (more than %d characters): message abandoned",
1625 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1629 smtp_reply = US"552 Message header is ridiculously long";
1630 receive_swallow_smtp();
1631 goto TIDYUP; /* Skip to end of function */
1636 give_local_error(ERRMESS_VLONGHEADER,
1637 string_sprintf("message header longer than %d characters received: "
1638 "message not accepted", header_maxsize), US"", error_rc, stdin,
1640 /* Does not return */
1644 continue; /* With next input character */
1646 /* End of header line reached */
1650 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1652 receive_linecount++;
1653 message_linecount++;
1655 /* Keep track of maximum line length */
1657 if (ptr - prevlines_length > max_received_linelength)
1658 max_received_linelength = ptr - prevlines_length;
1659 prevlines_length = ptr + 1;
1661 /* Now put in the terminating newline. There is always space for
1662 at least two more characters. */
1664 next->text[ptr++] = '\n';
1667 /* A blank line signals the end of the headers; release the unwanted
1668 space and set next to NULL to indicate this. */
1677 /* There is data in the line; see if the next input character is a
1678 whitespace character. If it is, we have a continuation of this header line.
1679 There is always space for at least one character at this point. */
1683 int nextch = (RECEIVE_GETC)();
1684 if (nextch == ' ' || nextch == '\t')
1686 next->text[ptr++] = nextch;
1688 continue; /* Iterate the loop */
1690 else if (nextch != EOF) (RECEIVE_UNGETC)(nextch); /* For next time */
1691 else ch = EOF; /* Cause main loop to exit at end */
1694 /* We have got to the real line end. Terminate the string and release store
1695 beyond it. If it turns out to be a real header, internal binary zeros will
1696 be squashed later. */
1698 next->text[ptr] = 0;
1700 store_reset(next->text + ptr + 1);
1702 /* Check the running total size against the overall message size limit. We
1703 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1704 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1705 headers - the code to read the body will then also hit the buffer. */
1707 if (message_size > thismessage_size_limit) break;
1709 /* A line that is not syntactically correct for a header also marks
1710 the end of the headers. In this case, we leave next containing the
1711 first data line. This might actually be several lines because of the
1712 continuation logic applied above, but that doesn't matter.
1714 It turns out that smail, and presumably sendmail, accept leading lines
1717 From ph10 Fri Jan 5 12:35 GMT 1996
1719 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1720 find any documentation of this, but for compatibility it had better be
1721 accepted. Exim restricts it to the case of non-smtp messages, and
1722 treats it as an alternative to the -f command line option. Thus it is
1723 ignored except for trusted users or filter testing. Otherwise it is taken
1724 as the sender address, unless -f was used (sendmail compatibility).
1726 It further turns out that some UUCPs generate the From_line in a different
1729 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1731 The regex for matching these things is now capable of recognizing both
1732 formats (including 2- and 4-digit years in the latter). In fact, the regex
1733 is now configurable, as is the expansion string to fish out the sender.
1735 Even further on it has been discovered that some broken clients send
1736 these lines in SMTP messages. There is now an option to ignore them from
1737 specified hosts or networks. Sigh. */
1739 if (header_last == header_list &&
1742 (sender_host_address != NULL &&
1743 verify_check_host(&ignore_fromline_hosts) == OK)
1745 (sender_host_address == NULL && ignore_fromline_local)
1747 regex_match_and_setup(regex_From, next->text, 0, -1))
1749 if (!sender_address_forced)
1751 uschar *uucp_sender = expand_string(uucp_from_sender);
1752 if (uucp_sender == NULL)
1754 log_write(0, LOG_MAIN|LOG_PANIC,
1755 "expansion of \"%s\" failed after matching "
1756 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1760 int start, end, domain;
1762 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1763 &start, &end, &domain, TRUE);
1764 if (newsender != NULL)
1766 if (domain == 0 && newsender[0] != 0)
1767 newsender = rewrite_address_qualify(newsender, FALSE);
1769 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1771 sender_address = newsender;
1773 if (trusted_caller || filter_test != FTEST_NONE)
1775 authenticated_sender = NULL;
1776 originator_name = US"";
1777 sender_local = FALSE;
1780 if (filter_test != FTEST_NONE)
1781 printf("Sender taken from \"From \" line\n");
1788 /* Not a leading "From " line. Check to see if it is a valid header line.
1789 Header names may contain any non-control characters except space and colon,
1794 uschar *p = next->text;
1796 /* If not a valid header line, break from the header reading loop, leaving
1797 next != NULL, indicating that it holds the first line of the body. */
1799 if (isspace(*p)) break;
1800 while (mac_isgraph(*p) && *p != ':') p++;
1801 while (isspace(*p)) p++;
1804 body_zerocount = had_zero;
1808 /* We have a valid header line. If there were any binary zeroes in
1809 the line, stomp on them here. */
1812 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1814 /* It is perfectly legal to have an empty continuation line
1815 at the end of a header, but it is confusing to humans
1816 looking at such messages, since it looks like a blank line.
1817 Reduce confusion by removing redundant white space at the
1818 end. We know that there is at least one printing character
1819 (the ':' tested for above) so there is no danger of running
1822 p = next->text + ptr - 2;
1825 while (*p == ' ' || *p == '\t') p--;
1826 if (*p != '\n') break;
1827 ptr = (p--) - next->text + 1;
1828 message_size -= next->slen - ptr;
1829 next->text[ptr] = 0;
1833 /* Add the header to the chain */
1835 next->type = htype_other;
1837 header_last->next = next;
1840 /* Check the limit for individual line lengths. This comes after adding to
1841 the chain so that the failing line is reflected if a bounce is generated
1842 (for a local message). */
1844 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1846 log_write(0, LOG_MAIN, "overlong message header line received from "
1847 "%s (more than %d characters): message abandoned",
1848 sender_host_unknown? sender_ident : sender_fullhost,
1849 header_line_maxsize);
1853 smtp_reply = US"552 A message header line is too long";
1854 receive_swallow_smtp();
1855 goto TIDYUP; /* Skip to end of function */
1860 give_local_error(ERRMESS_VLONGHDRLINE,
1861 string_sprintf("message header line longer than %d characters "
1862 "received: message not accepted", header_line_maxsize), US"",
1863 error_rc, stdin, header_list->next);
1864 /* Does not return */
1868 /* Note if any resent- fields exist. */
1870 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1872 resents_exist = TRUE;
1873 resent_prefix = US"Resent-";
1877 /* The line has been handled. If we have hit EOF, break out of the loop,
1878 indicating no pending data line. */
1880 if (ch == EOF) { next = NULL; break; }
1882 /* Set up for the next header */
1885 next = store_get(sizeof(header_line));
1886 next->text = store_get(header_size);
1889 prevlines_length = 0;
1890 } /* Continue, starting to read the next header */
1892 /* At this point, we have read all the headers into a data structure in main
1893 store. The first header is still the dummy placeholder for the Received: header
1894 we are going to generate a bit later on. If next != NULL, it contains the first
1895 data line - which terminated the headers before reaching a blank line (not the
1900 debug_printf(">>Headers received:\n");
1901 for (h = header_list->next; h != NULL; h = h->next)
1902 debug_printf("%s", h->text);
1906 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1907 is dropped immediately after valid headers, the next thing we will see is EOF.
1908 We must test for this specially, as further down the reading of the data is
1909 skipped if already at EOF. */
1911 if (smtp_input && (receive_feof)())
1913 smtp_reply = handle_lost_connection(US" (after header)");
1915 goto TIDYUP; /* Skip to end of function */
1918 /* If this is a filter test run and no headers were read, output a warning
1919 in case there is a mistake in the test message. */
1921 if (filter_test != FTEST_NONE && header_list->next == NULL)
1922 printf("Warning: no message headers read\n");
1925 /* Scan the headers to identify them. Some are merely marked for later
1926 processing; some are dealt with here. */
1928 for (h = header_list->next; h != NULL; h = h->next)
1930 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1931 if (is_resent) contains_resent_headers = TRUE;
1933 switch (header_checkname(h, is_resent))
1936 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
1940 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
1943 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1946 date_header_exists = !resents_exist || is_resent;
1949 /* Same comments as about Return-Path: below. */
1951 case htype_delivery_date:
1952 if (delivery_date_remove) h->type = htype_old;
1955 /* Same comments as about Return-Path: below. */
1957 case htype_envelope_to:
1958 if (envelope_to_remove) h->type = htype_old;
1961 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1962 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1963 header consists of just the login id of the user who called Exim, rewrite
1964 it with the gecos field first. Apply this rule to Resent-From: if there
1965 are resent- fields. */
1968 h->type = htype_from;
1969 if (!resents_exist || is_resent)
1974 uschar *s = Ustrchr(h->text, ':') + 1;
1975 while (isspace(*s)) s++;
1976 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1978 uschar *name = is_resent? US"Resent-From" : US"From";
1979 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1980 originator_login, qualify_domain_sender);
1981 from_header = header_last;
1982 h->type = htype_old;
1983 DEBUG(D_receive|D_rewrite)
1984 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1990 /* Identify the Message-id: header for generating "in-reply-to" in the
1991 autoreply transport. For incoming logging, save any resent- value. In both
1992 cases, take just the first of any multiples. */
1995 if (msgid_header == NULL && (!resents_exist || is_resent))
2002 /* Flag all Received: headers */
2004 case htype_received:
2005 h->type = htype_received;
2009 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2011 case htype_reply_to:
2012 h->type = htype_reply_to;
2015 /* The Return-path: header is supposed to be added to messages when
2016 they leave the SMTP system. We shouldn't receive messages that already
2017 contain Return-path. However, since Exim generates Return-path: on
2018 local delivery, resent messages may well contain it. We therefore
2019 provide an option (which defaults on) to remove any Return-path: headers
2020 on input. Removal actually means flagging as "old", which prevents the
2021 header being transmitted with the message. */
2023 case htype_return_path:
2024 if (return_path_remove) h->type = htype_old;
2026 /* If we are testing a mail filter file, use the value of the
2027 Return-Path: header to set up the return_path variable, which is not
2028 otherwise set. However, remove any <> that surround the address
2029 because the variable doesn't have these. */
2031 if (filter_test != FTEST_NONE)
2033 uschar *start = h->text + 12;
2034 uschar *end = start + Ustrlen(start);
2035 while (isspace(*start)) start++;
2036 while (end > start && isspace(end[-1])) end--;
2037 if (*start == '<' && end[-1] == '>')
2042 return_path = string_copyn(start, end - start);
2043 printf("Return-path taken from \"Return-path:\" header line\n");
2047 /* If there is a "Sender:" header and the message is locally originated,
2048 and from an untrusted caller and suppress_local_fixups is not set, or if we
2049 are in submission mode for a remote message, mark it "old" so that it will
2050 not be transmitted with the message, unless active_local_sender_retain is
2051 set. (This can only be true if active_local_from_check is false.) If there
2052 are any resent- headers in the message, apply this rule to Resent-Sender:
2053 instead of Sender:. Messages with multiple resent- header sets cannot be
2054 tidily handled. (For this reason, at least one MUA - Pine - turns old
2055 resent- headers into X-resent- headers when resending, leaving just one
2059 h->type = ((!active_local_sender_retain &&
2061 (sender_local && !trusted_caller && !suppress_local_fixups)
2065 (!resents_exist||is_resent))?
2066 htype_old : htype_sender;
2069 /* Remember the Subject: header for logging. There is no Resent-Subject */
2075 /* "To:" gets flagged, and the existence of a recipient header is noted,
2076 whether it's resent- or not. */
2081 to_or_cc_header_exists = TRUE;
2087 /* Extract recipients from the headers if that is required (the -t option).
2088 Note that this is documented as being done *before* any address rewriting takes
2089 place. There are two possibilities:
2091 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2092 recipients already listed are to be REMOVED from the message. Smail 3 works
2093 like this. We need to build a non-recipients tree for that list, because in
2094 subsequent processing this data is held in a tree and that's what the
2095 spool_write_header() function expects. Make sure that non-recipient addresses
2096 are fully qualified and rewritten if necessary.
2098 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2099 those in the command line arguments (and it is rumoured some other MTAs do
2100 this). Therefore, there is an option to make Exim behave this way.
2102 *** Notes on "Resent-" header lines ***
2104 The presence of resent-headers in the message makes -t horribly ambiguous.
2105 Experiments with sendmail showed that it uses recipients for all resent-
2106 headers, totally ignoring the concept of "sets of resent- headers" as described
2107 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2108 with all the addresses in one instance of each header.
2110 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2111 error for -t if there were resent- headers in the message. However, after a
2112 discussion on the mailing list, I've learned that there are MUAs that use
2113 resent- headers with -t, and also that the stuff about sets of resent- headers
2114 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2115 message with -t and resent- header lines makes sure that only *its* resent-
2116 headers are present; previous ones are often renamed as X-resent- for example.
2118 Consequently, Exim has been changed so that, if any resent- header lines are
2119 present, the recipients are taken from all of the appropriate resent- lines,
2120 and not from the ordinary To:, Cc:, etc. */
2125 error_block **bnext = &bad_addresses;
2127 if (extract_addresses_remove_arguments)
2129 while (recipients_count-- > 0)
2131 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2132 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2133 tree_add_nonrecipient(s);
2135 recipients_list = NULL;
2136 recipients_count = recipients_list_max = 0;
2139 /* Now scan the headers */
2141 for (h = header_list->next; h != NULL; h = h->next)
2143 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2144 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2146 uschar *s = Ustrchr(h->text, ':') + 1;
2147 while (isspace(*s)) s++;
2149 parse_allow_group = TRUE; /* Allow address group syntax */
2153 uschar *ss = parse_find_address_end(s, FALSE);
2154 uschar *recipient, *errmess, *p, *pp;
2155 int start, end, domain;
2157 /* Check on maximum */
2159 if (recipients_max > 0 && ++rcount > recipients_max)
2161 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2162 US"message rejected: ", error_rc, stdin, NULL);
2163 /* Does not return */
2166 /* Make a copy of the address, and remove any internal newlines. These
2167 may be present as a result of continuations of the header line. The
2168 white space that follows the newline must not be removed - it is part
2171 pp = recipient = store_get(ss - s + 1);
2172 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2174 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2177 /* Keep a list of all the bad addresses so we can send a single
2178 error message at the end. However, an empty address is not an error;
2179 just ignore it. This can come from an empty group list like
2181 To: Recipients of list:;
2183 If there are no recipients at all, an error will occur later. */
2185 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2187 int len = Ustrlen(s);
2188 error_block *b = store_get(sizeof(error_block));
2189 while (len > 0 && isspace(s[len-1])) len--;
2191 b->text1 = string_printing(string_copyn(s, len));
2197 /* If the recipient is already in the nonrecipients tree, it must
2198 have appeared on the command line with the option extract_addresses_
2199 remove_arguments set. Do not add it to the recipients, and keep a note
2200 that this has happened, in order to give a better error if there are
2201 no recipients left. */
2203 else if (recipient != NULL)
2205 if (tree_search(tree_nonrecipients, recipient) == NULL)
2206 receive_add_recipient(recipient, -1);
2208 extracted_ignored = TRUE;
2211 /* Move on past this address */
2213 s = ss + (*ss? 1:0);
2214 while (isspace(*s)) s++;
2215 } /* Next address */
2217 parse_allow_group = FALSE; /* Reset group syntax flags */
2218 parse_found_group = FALSE;
2220 /* If this was the bcc: header, mark it "old", which means it
2221 will be kept on the spool, but not transmitted as part of the
2224 if (h->type == htype_bcc) h->type = htype_old;
2225 } /* For appropriate header line */
2226 } /* For each header line */
2230 /* Now build the unique message id. This has changed several times over the
2231 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2232 Retaining all the history in the comment has become too unwieldy - read
2233 previous release sources if you want it.
2235 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2236 The first part is the current time, in seconds. The second part is the current
2237 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2238 can hold a number in the range 0-3843. It used to be a computed sequence
2239 number, but is now the fractional component of the current time in units of
2240 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2241 received, Exim ensures that the timer has ticked at the appropriate level
2242 before proceeding, to avoid duplication if the pid happened to be re-used
2243 within the same time period. It seems likely that most messages will take at
2244 least half a millisecond to be received, so no delay will normally be
2245 necessary. At least for some time...
2247 There is a modification when localhost_number is set. Formerly this was allowed
2248 to be as large as 255. Now it is restricted to the range 0-16, and the final
2249 component of the message id becomes (localhost_number * 200) + fractional time
2250 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2252 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2253 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2254 still allows the tttttt field to hold a large enough number to last for some
2255 more decades, and the final two-digit field can hold numbers up to 1295, which
2256 is enough for milliseconds (instead of 1/2000 of a second).
2258 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2259 pid, so it is probably safe because pids have to be positive. The
2260 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2261 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2263 Note that string_base62() returns its data in a static storage block, so it
2264 must be copied before calling string_base62() again. It always returns exactly
2267 There doesn't seem to be anything in the RFC which requires a message id to
2268 start with a letter, but Smail was changed to ensure this. The external form of
2269 the message id (as supplied by string expansion) therefore starts with an
2270 additional leading 'E'. The spool file names do not include this leading
2271 letter and it is not used internally.
2273 NOTE: If ever the format of message ids is changed, the regular expression for
2274 checking that a string is in this format must be updated in a corresponding
2275 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2276 must also be changed to reflect the correct string length. Then, of course,
2277 other programs that rely on the message id format will need updating too. */
2279 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2280 message_id[6] = '-';
2281 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2283 /* Deal with the case where the host number is set. The value of the number was
2284 checked when it was read, to ensure it isn't too big. The timing granularity is
2285 left in id_resolution so that an appropriate wait can be done after receiving
2286 the message, if necessary (we hope it won't be). */
2288 if (host_number_string != NULL)
2290 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2291 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2292 string_base62((long int)(
2293 host_number * (1000000/id_resolution) +
2294 message_id_tv.tv_usec/id_resolution)) + 4);
2297 /* Host number not set: final field is just the fractional time at an
2298 appropriate resolution. */
2302 id_resolution = (BASE_62 == 62)? 500 : 1000;
2303 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2304 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2307 /* Add the current message id onto the current process info string if
2310 (void)string_format(process_info + process_info_len,
2311 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2313 /* If we are using multiple input directories, set up the one for this message
2314 to be the least significant base-62 digit of the time of arrival. Otherwise
2315 ensure that it is an empty string. */
2317 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2319 /* Now that we have the message-id, if there is no message-id: header, generate
2320 one, but only for local (without suppress_local_fixups) or submission mode
2321 messages. This can be user-configured if required, but we had better flatten
2322 any illegal characters therein. */
2324 if (msgid_header == NULL &&
2325 ((sender_host_address == NULL && !suppress_local_fixups)
2326 || submission_mode))
2329 uschar *id_text = US"";
2330 uschar *id_domain = primary_hostname;
2332 /* Permit only letters, digits, dots, and hyphens in the domain */
2334 if (message_id_domain != NULL)
2336 uschar *new_id_domain = expand_string(message_id_domain);
2337 if (new_id_domain == NULL)
2339 if (!expand_string_forcedfail)
2340 log_write(0, LOG_MAIN|LOG_PANIC,
2341 "expansion of \"%s\" (message_id_header_domain) "
2342 "failed: %s", message_id_domain, expand_string_message);
2344 else if (*new_id_domain != 0)
2346 id_domain = new_id_domain;
2347 for (p = id_domain; *p != 0; p++)
2348 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2352 /* Permit all characters except controls and RFC 2822 specials in the
2353 additional text part. */
2355 if (message_id_text != NULL)
2357 uschar *new_id_text = expand_string(message_id_text);
2358 if (new_id_text == NULL)
2360 if (!expand_string_forcedfail)
2361 log_write(0, LOG_MAIN|LOG_PANIC,
2362 "expansion of \"%s\" (message_id_header_text) "
2363 "failed: %s", message_id_text, expand_string_message);
2365 else if (*new_id_text != 0)
2367 id_text = new_id_text;
2368 for (p = id_text; *p != 0; p++)
2369 if (mac_iscntrl_or_special(*p)) *p = '-';
2373 /* Add the header line */
2375 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2376 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2379 /* If we are to log recipients, keep a copy of the raw ones before any possible
2380 rewriting. Must copy the count, because later ACLs and the local_scan()
2381 function may mess with the real recipients. */
2383 if ((log_extra_selector & LX_received_recipients) != 0)
2385 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2386 for (i = 0; i < recipients_count; i++)
2387 raw_recipients[i] = string_copy(recipients_list[i].address);
2388 raw_recipients_count = recipients_count;
2391 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2392 recipients will get here only if the conditions were right (allow_unqualified_
2393 recipient is TRUE). */
2395 for (i = 0; i < recipients_count; i++)
2396 recipients_list[i].address =
2397 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2398 global_rewrite_rules, rewrite_existflags);
2400 /* If there is no From: header, generate one for local (without
2401 suppress_local_fixups) or submission_mode messages. If there is no sender
2402 address, but the sender is local or this is a local delivery error, use the
2403 originator login. This shouldn't happen for genuine bounces, but might happen
2404 for autoreplies. The addition of From: must be done *before* checking for the
2405 possible addition of a Sender: header, because untrusted_set_sender allows an
2406 untrusted user to set anything in the envelope (which might then get info
2407 From:) but we still want to ensure a valid Sender: if it is required. */
2409 if (from_header == NULL &&
2410 ((sender_host_address == NULL && !suppress_local_fixups)
2411 || submission_mode))
2413 uschar *oname = US"";
2415 /* Use the originator_name if this is a locally submitted message and the
2416 caller is not trusted. For trusted callers, use it only if -F was used to
2417 force its value or if we have a non-SMTP message for which -f was not used
2418 to set the sender. */
2420 if (sender_host_address == NULL)
2422 if (!trusted_caller || sender_name_forced ||
2423 (!smtp_input && !sender_address_forced))
2424 oname = originator_name;
2427 /* For non-locally submitted messages, the only time we use the originator
2428 name is when it was forced by the /name= option on control=submission. */
2432 if (submission_name != NULL) oname = submission_name;
2435 /* Envelope sender is empty */
2437 if (sender_address[0] == 0)
2439 uschar *fromstart, *fromend;
2441 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2442 oname, (oname[0] == 0)? "" : " <");
2443 fromend = (oname[0] == 0)? US"" : US">";
2445 if (sender_local || local_error_message)
2447 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2448 local_part_quote(originator_login), qualify_domain_sender,
2451 else if (submission_mode && authenticated_id != NULL)
2453 if (submission_domain == NULL)
2455 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2456 local_part_quote(authenticated_id), qualify_domain_sender,
2459 else if (submission_domain[0] == 0) /* empty => whole address set */
2461 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2466 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2467 local_part_quote(authenticated_id), submission_domain,
2470 from_header = header_last; /* To get it checked for Sender: */
2474 /* There is a non-null envelope sender. Build the header using the original
2475 sender address, before any rewriting that might have been done while
2480 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2482 (oname[0] == 0)? "" : " <",
2483 (sender_address_unrewritten == NULL)?
2484 sender_address : sender_address_unrewritten,
2485 (oname[0] == 0)? "" : ">");
2487 from_header = header_last; /* To get it checked for Sender: */
2492 /* If the sender is local (without suppress_local_fixups), or if we are in
2493 submission mode and there is an authenticated_id, check that an existing From:
2494 is correct, and if not, generate a Sender: header, unless disabled. Any
2495 previously-existing Sender: header was removed above. Note that sender_local,
2496 as well as being TRUE if the caller of exim is not trusted, is also true if a
2497 trusted caller did not supply a -f argument for non-smtp input. To allow
2498 trusted callers to forge From: without supplying -f, we have to test explicitly
2499 here. If the From: header contains more than one address, then the call to
2500 parse_extract_address fails, and a Sender: header is inserted, as required. */
2502 if (from_header != NULL &&
2503 (active_local_from_check &&
2504 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2505 (submission_mode && authenticated_id != NULL))
2508 BOOL make_sender = TRUE;
2509 int start, end, domain;
2511 uschar *from_address =
2512 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2513 &start, &end, &domain, FALSE);
2514 uschar *generated_sender_address;
2516 if (submission_mode)
2518 if (submission_domain == NULL)
2520 generated_sender_address = string_sprintf("%s@%s",
2521 local_part_quote(authenticated_id), qualify_domain_sender);
2523 else if (submission_domain[0] == 0) /* empty => full address */
2525 generated_sender_address = string_sprintf("%s",
2530 generated_sender_address = string_sprintf("%s@%s",
2531 local_part_quote(authenticated_id), submission_domain);
2535 generated_sender_address = string_sprintf("%s@%s",
2536 local_part_quote(originator_login), qualify_domain_sender);
2538 /* Remove permitted prefixes and suffixes from the local part of the From:
2539 address before doing the comparison with the generated sender. */
2541 if (from_address != NULL)
2544 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2546 if (at != NULL) *at = 0;
2547 from_address += route_check_prefix(from_address, local_from_prefix);
2548 slen = route_check_suffix(from_address, local_from_suffix);
2551 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2552 from_address += slen;
2554 if (at != NULL) *at = '@';
2556 if (strcmpic(generated_sender_address, from_address) == 0 ||
2557 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2558 make_sender = FALSE;
2561 /* We have to cause the Sender header to be rewritten if there are
2562 appropriate rewriting rules. */
2566 if (submission_mode && submission_name == NULL)
2567 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2568 generated_sender_address);
2570 header_add(htype_sender, "%sSender: %s <%s>\n",
2572 submission_mode? submission_name : originator_name,
2573 generated_sender_address);
2576 /* Ensure that a non-null envelope sender address corresponds to the
2577 submission mode sender address. */
2579 if (submission_mode && sender_address[0] != 0)
2581 if (sender_address_unrewritten == NULL)
2582 sender_address_unrewritten = sender_address;
2583 sender_address = generated_sender_address;
2584 log_write(L_address_rewrite, LOG_MAIN,
2585 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2586 sender_address_unrewritten, generated_sender_address);
2591 /* If there are any rewriting rules, apply them to the sender address, unless
2592 it has already been rewritten as part of verification for SMTP input. */
2594 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2595 sender_address[0] != 0)
2597 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2598 global_rewrite_rules, rewrite_existflags);
2599 DEBUG(D_receive|D_rewrite)
2600 debug_printf("rewritten sender = %s\n", sender_address);
2604 /* The headers must be run through rewrite_header(), because it ensures that
2605 addresses are fully qualified, as well as applying any rewriting rules that may
2608 Qualification of header addresses in a message from a remote host happens only
2609 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2610 appropriate. For local messages, qualification always happens, unless -bnq is
2611 used to explicitly suppress it. No rewriting is done for an unqualified address
2612 that is left untouched.
2614 We start at the second header, skipping our own Received:. This rewriting is
2615 documented as happening *after* recipient addresses are taken from the headers
2616 by the -t command line option. An added Sender: gets rewritten here. */
2618 for (h = header_list->next; h != NULL; h = h->next)
2620 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2621 rewrite_existflags, TRUE);
2622 if (newh != NULL) h = newh;
2626 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2627 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2628 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2629 exists, this applies to the set of resent- headers rather than the normal set.
2631 The requirement for a recipient header has been removed in RFC 2822. At this
2632 point in the code, earlier versions of Exim added a To: header for locally
2633 submitted messages, and an empty Bcc: header for others. In the light of the
2634 changes in RFC 2822, this was dropped in November 2003. */
2637 /* If there is no date header, generate one if the message originates locally
2638 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2639 submission mode flag is set. Messages without Date: are not valid, but it seems
2640 to be more confusing if Exim adds one to all remotely-originated messages. */
2642 if (!date_header_exists &&
2643 ((sender_host_address == NULL && !suppress_local_fixups)
2644 || submission_mode))
2645 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2647 search_tidyup(); /* Free any cached resources */
2649 /* Show the complete set of headers if debugging. Note that the first one (the
2650 new Received:) has not yet been set. */
2654 debug_printf(">>Headers after rewriting and local additions:\n");
2655 for (h = header_list->next; h != NULL; h = h->next)
2656 debug_printf("%c %s", h->type, h->text);
2660 /* The headers are now complete in store. If we are running in filter
2661 testing mode, that is all this function does. Return TRUE if the message
2662 ended with a dot. */
2664 if (filter_test != FTEST_NONE)
2666 process_info[process_info_len] = 0;
2667 return message_ended == END_DOT;
2670 /* Open a new spool file for the data portion of the message. We need
2671 to access it both via a file descriptor and a stream. Try to make the
2672 directory if it isn't there. Note re use of sprintf: spool_directory
2673 is checked on input to be < 200 characters long. */
2675 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2677 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2680 if (errno == ENOENT)
2683 sprintf(CS temp, "input/%s", message_subdir);
2684 if (message_subdir[0] == 0) temp[5] = 0;
2685 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2686 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2689 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2690 spool_name, strerror(errno));
2693 /* Make sure the file's group is the Exim gid, and double-check the mode
2694 because the group setting doesn't always get set automatically. */
2696 (void)fchown(data_fd, exim_uid, exim_gid);
2697 (void)fchmod(data_fd, SPOOL_MODE);
2699 /* We now have data file open. Build a stream for it and lock it. We lock only
2700 the first line of the file (containing the message ID) because otherwise there
2701 are problems when Exim is run under Cygwin (I'm told). See comments in
2702 spool_in.c, where the same locking is done. */
2704 data_file = fdopen(data_fd, "w+");
2705 lock_data.l_type = F_WRLCK;
2706 lock_data.l_whence = SEEK_SET;
2707 lock_data.l_start = 0;
2708 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2710 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2711 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2712 errno, strerror(errno));
2714 /* We have an open, locked data file. Write the message id to it to make it
2715 self-identifying. Then read the remainder of the input of this message and
2716 write it to the data file. If the variable next != NULL, it contains the first
2717 data line (which was read as a header but then turned out not to have the right
2718 format); write it (remembering that it might contain binary zeros). The result
2719 of fwrite() isn't inspected; instead we call ferror() below. */
2721 fprintf(data_file, "%s-D\n", message_id);
2724 uschar *s = next->text;
2725 int len = next->slen;
2726 (void)fwrite(s, 1, len, data_file);
2727 body_linecount++; /* Assumes only 1 line */
2730 /* Note that we might already be at end of file, or the logical end of file
2731 (indicated by '.'), or might have encountered an error while writing the
2732 message id or "next" line. */
2734 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2738 message_ended = read_message_data_smtp(data_file);
2739 receive_linecount++; /* The terminating "." line */
2741 else message_ended = read_message_data(data_file);
2743 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2744 message_linecount += body_linecount;
2746 /* Handle premature termination of SMTP */
2748 if (smtp_input && message_ended == END_EOF)
2750 Uunlink(spool_name); /* Lose data file when closed */
2751 message_id[0] = 0; /* Indicate no message accepted */
2752 smtp_reply = handle_lost_connection(US"");
2754 goto TIDYUP; /* Skip to end of function */
2757 /* Handle message that is too big. Don't use host_or_ident() in the log
2758 message; we want to see the ident value even for non-remote messages. */
2760 if (message_ended == END_SIZE)
2762 Uunlink(spool_name); /* Lose the data file when closed */
2763 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2765 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2766 "message too big: read=%d max=%d",
2768 (sender_fullhost == NULL)? "" : " H=",
2769 (sender_fullhost == NULL)? US"" : sender_fullhost,
2770 (sender_ident == NULL)? "" : " U=",
2771 (sender_ident == NULL)? US"" : sender_ident,
2773 thismessage_size_limit);
2777 smtp_reply = US"552 Message size exceeds maximum permitted";
2778 message_id[0] = 0; /* Indicate no message accepted */
2779 goto TIDYUP; /* Skip to end of function */
2783 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2784 give_local_error(ERRMESS_TOOBIG,
2785 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2786 US"message rejected: ", error_rc, data_file, header_list);
2787 /* Does not return */
2792 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2793 example, there may be some expansion in an ACL that uses a timer.) */
2795 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2797 /* The message body has now been read into the data file. Call fflush() to
2798 empty the buffers in C, and then call fsync() to get the data written out onto
2799 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2800 having to do this). If there was an I/O error on either input or output,
2801 attempt to send an error message, and unlink the spool file. For non-SMTP input
2802 we can then give up. Note that for SMTP input we must swallow the remainder of
2803 the input in cases of output errors, since the far end doesn't expect to see
2804 anything until the terminating dot line is sent. */
2806 if (fflush(data_file) == EOF || ferror(data_file) ||
2807 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2809 uschar *msg_errno = US strerror(errno);
2810 BOOL input_error = (receive_ferror)() != 0;
2811 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2812 input_error? "Input read" : "Spool write",
2814 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2816 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2817 Uunlink(spool_name); /* Lose the data file */
2822 smtp_reply = US"451 Error while reading input data";
2825 smtp_reply = US"451 Error while writing spool file";
2826 receive_swallow_smtp();
2828 message_id[0] = 0; /* Indicate no message accepted */
2829 goto TIDYUP; /* Skip to end of function */
2834 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2835 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2837 /* Does not return */
2842 /* No I/O errors were encountered while writing the data file. */
2844 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2847 /* If there were any bad addresses extracted by -t, or there were no recipients
2848 left after -t, send a message to the sender of this message, or write it to
2849 stderr if the error handling option is set that way. Note that there may
2850 legitimately be no recipients for an SMTP message if they have all been removed
2853 We need to rewind the data file in order to read it. In the case of no
2854 recipients or stderr error writing, throw the data file away afterwards, and
2855 exit. (This can't be SMTP, which always ensures there's at least one
2856 syntactically good recipient address.) */
2858 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2862 if (recipients_count == 0) debug_printf("*** No recipients\n");
2863 if (bad_addresses != NULL)
2865 error_block *eblock = bad_addresses;
2866 debug_printf("*** Bad address(es)\n");
2867 while (eblock != NULL)
2869 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2870 eblock = eblock->next;
2875 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2877 /* If configured to send errors to the sender, but this fails, force
2878 a failure error code. We use a special one for no recipients so that it
2879 can be detected by the autoreply transport. Otherwise error_rc is set to
2880 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2881 it is EXIT_SUCCESS. */
2883 if (error_handling == ERRORS_SENDER)
2885 if (!moan_to_sender(
2886 (bad_addresses == NULL)?
2887 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2888 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2889 bad_addresses, header_list, data_file, FALSE))
2890 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2894 if (bad_addresses == NULL)
2896 if (extracted_ignored)
2897 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2899 fprintf(stderr, "exim: no recipients in message\n");
2903 fprintf(stderr, "exim: invalid address%s",
2904 (bad_addresses->next == NULL)? ":" : "es:\n");
2905 while (bad_addresses != NULL)
2907 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2908 bad_addresses->text2);
2909 bad_addresses = bad_addresses->next;
2914 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2916 Uunlink(spool_name);
2917 (void)fclose(data_file);
2918 exim_exit(error_rc);
2922 /* Data file successfully written. Generate text for the Received: header by
2923 expanding the configured string, and adding a timestamp. By leaving this
2924 operation till now, we ensure that the timestamp is the time that message
2925 reception was completed. However, this is deliberately done before calling the
2926 data ACL and local_scan().
2928 This Received: header may therefore be inspected by the data ACL and by code in
2929 the local_scan() function. When they have run, we update the timestamp to be
2930 the final time of reception.
2932 If there is just one recipient, set up its value in the $received_for variable
2933 for use when we generate the Received: header.
2935 Note: the checking for too many Received: headers is handled by the delivery
2938 timestamp = expand_string(US"${tod_full}");
2939 if (recipients_count == 1) received_for = recipients_list[0].address;
2940 received = expand_string(received_header_text);
2941 received_for = NULL;
2943 if (received == NULL)
2945 Uunlink(spool_name); /* Lose the data file */
2946 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2947 "(received_header_text) failed: %s", string_printing(received_header_text),
2948 expand_string_message);
2951 /* The first element on the header chain is reserved for the Received header,
2952 so all we have to do is fill in the text pointer, and set the type. However, if
2953 the result of the expansion is an empty string, we leave the header marked as
2954 "old" so as to refrain from adding a Received header. */
2956 if (received[0] == 0)
2958 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2959 received_header->type = htype_old;
2963 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2964 received_header->type = htype_received;
2967 received_header->slen = Ustrlen(received_header->text);
2969 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2970 received_header->type, received_header->text);
2972 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2974 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2975 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2977 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2978 now, before running the DATA ACL. */
2980 add_acl_headers(US"MAIL or RCPT");
2982 /* If an ACL is specified for checking things at this stage of reception of a
2983 message, run it, unless all the recipients were removed by "discard" in earlier
2984 ACLs. That is the only case in which recipients_count can be zero at this
2985 stage. Set deliver_datafile to point to the data file so that $message_body and
2986 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2989 deliver_datafile = data_fd;
2992 enable_dollar_recipients = TRUE;
2994 if (recipients_count == 0)
2996 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3000 /* Handle interactive SMTP messages */
3002 if (smtp_input && !smtp_batched_input)
3005 #ifdef EXPERIMENTAL_DOMAINKEYS
3006 dk_exim_verify_finish();
3008 #ifdef EXPERIMENTAL_DKIM
3009 dkim_exim_verify_finish();
3012 #ifdef WITH_CONTENT_SCAN
3013 if (acl_smtp_mime != NULL &&
3014 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3016 #endif /* WITH_CONTENT_SCAN */
3018 /* Check the recipients count again, as the MIME ACL might have changed
3021 if (acl_smtp_data != NULL && recipients_count > 0)
3023 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3024 add_acl_headers(US"DATA");
3027 recipients_count = 0;
3028 blackholed_by = US"DATA ACL";
3029 if (log_msg != NULL)
3030 blackhole_log_msg = string_sprintf(": %s", log_msg);
3034 Uunlink(spool_name);
3035 #ifdef WITH_CONTENT_SCAN
3038 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3039 smtp_yield = FALSE; /* No more messsages after dropped connection */
3040 smtp_reply = US""; /* Indicate reply already sent */
3041 message_id[0] = 0; /* Indicate no message accepted */
3042 goto TIDYUP; /* Skip to end of function */
3047 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3048 we cannot take different actions for permanent and temporary rejections. */
3053 #ifdef WITH_CONTENT_SCAN
3054 if (acl_not_smtp_mime != NULL &&
3055 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3058 #endif /* WITH_CONTENT_SCAN */
3060 if (acl_not_smtp != NULL)
3062 uschar *user_msg, *log_msg;
3063 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3066 recipients_count = 0;
3067 blackholed_by = US"non-SMTP ACL";
3068 if (log_msg != NULL)
3069 blackhole_log_msg = string_sprintf(": %s", log_msg);
3073 Uunlink(spool_name);
3074 #ifdef WITH_CONTENT_SCAN
3077 /* The ACL can specify where rejections are to be logged, possibly
3078 nowhere. The default is main and reject logs. */
3080 if (log_reject_target != 0)
3081 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3082 sender_address, log_msg);
3084 if (user_msg == NULL) user_msg = US"local configuration problem";
3085 if (smtp_batched_input)
3087 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3088 /* Does not return */
3092 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3093 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3094 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3096 /* Does not return */
3099 add_acl_headers(US"non-SMTP");
3103 /* The applicable ACLs have been run */
3105 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3106 if (queue_only_policy) queued_by = US"ACL";
3109 #ifdef WITH_CONTENT_SCAN
3113 /* The final check on the message is to run the scan_local() function. The
3114 version supplied with Exim always accepts, but this is a hook for sysadmins to
3115 supply their own checking code. The local_scan() function is run even when all
3116 the recipients have been discarded. */
3118 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3120 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3121 deleted, and the incident gets logged. */
3123 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3124 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3125 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3126 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3128 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3129 local_scan_timeout);
3130 local_scan_data = NULL;
3132 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3133 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3134 rc = local_scan(data_fd, &local_scan_data);
3136 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3138 enable_dollar_recipients = FALSE;
3140 store_pool = POOL_MAIN; /* In case changed */
3141 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3144 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3145 os_non_restarting_signal(SIGFPE, SIG_DFL);
3146 os_non_restarting_signal(SIGILL, SIG_DFL);
3147 os_non_restarting_signal(SIGBUS, SIG_DFL);
3149 /* The length check is paranoia against some runaway code, and also because
3150 (for a success return) lines in the spool file are read into big_buffer. */
3152 if (local_scan_data != NULL)
3154 int len = Ustrlen(local_scan_data);
3155 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3156 local_scan_data = string_copyn(local_scan_data, len);
3159 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3161 if (!deliver_freeze) /* ACL might have already frozen */
3163 deliver_freeze = TRUE;
3164 deliver_frozen_at = time(NULL);
3165 frozen_by = US"local_scan()";
3167 rc = LOCAL_SCAN_ACCEPT;
3169 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3171 if (!queue_only_policy) /* ACL might have already queued */
3173 queue_only_policy = TRUE;
3174 queued_by = US"local_scan()";
3176 rc = LOCAL_SCAN_ACCEPT;
3179 /* Message accepted: remove newlines in local_scan_data because otherwise
3180 the spool file gets corrupted. Ensure that all recipients are qualified. */
3182 if (rc == LOCAL_SCAN_ACCEPT)
3184 if (local_scan_data != NULL)
3187 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3189 for (i = 0; i < recipients_count; i++)
3191 recipient_item *r = recipients_list + i;
3192 r->address = rewrite_address_qualify(r->address, TRUE);
3193 if (r->errors_to != NULL)
3194 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3196 if (recipients_count == 0 && blackholed_by == NULL)
3197 blackholed_by = US"local_scan";
3200 /* Message rejected: newlines permitted in local_scan_data to generate
3201 multiline SMTP responses. */
3205 uschar *istemp = US"";
3211 errmsg = local_scan_data;
3213 Uunlink(spool_name); /* Cancel this message */
3217 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3218 "rejection given", rc);
3221 case LOCAL_SCAN_REJECT_NOLOGHDR:
3222 log_extra_selector &= ~LX_rejected_header;
3225 case LOCAL_SCAN_REJECT:
3226 smtp_code = US"550";
3227 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3230 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3231 log_extra_selector &= ~LX_rejected_header;
3234 case LOCAL_SCAN_TEMPREJECT:
3236 smtp_code = US"451";
3237 if (errmsg == NULL) errmsg = US"Temporary local problem";
3238 istemp = US"temporarily ";
3242 s = string_append(s, &size, &sptr, 2, US"F=",
3243 (sender_address[0] == 0)? US"<>" : sender_address);
3244 s = add_host_info_for_log(s, &size, &sptr);
3247 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3248 s, istemp, string_printing(errmsg));
3252 if (!smtp_batched_input)
3254 smtp_respond(smtp_code, 3, TRUE, errmsg);
3255 message_id[0] = 0; /* Indicate no message accepted */
3256 smtp_reply = US""; /* Indicate reply already sent */
3257 goto TIDYUP; /* Skip to end of function */
3261 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3262 /* Does not return */
3267 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3268 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3269 US"message rejected by local scan code: ", error_rc, data_file,
3271 /* Does not return */
3275 /* Reset signal handlers to ignore signals that previously would have caused
3276 the message to be abandoned. */
3278 signal(SIGTERM, SIG_IGN);
3279 signal(SIGINT, SIG_IGN);
3281 /* Ensure the first time flag is set in the newly-received message. */
3283 deliver_firsttime = TRUE;
3285 #ifdef EXPERIMENTAL_BRIGHTMAIL
3287 /* rewind data file */
3288 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3289 bmi_verdicts = bmi_process_message(header_list, data_fd);
3293 /* Update the timstamp in our Received: header to account for any time taken by
3294 an ACL or by local_scan(). The new time is the time that all reception
3295 processing is complete. */
3297 timestamp = expand_string(US"${tod_full}");
3298 tslen = Ustrlen(timestamp);
3300 memcpy(received_header->text + received_header->slen - tslen - 1,
3303 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3307 deliver_freeze = FALSE;
3308 queue_only_policy = FALSE;
3311 /* Keep the data file open until we have written the header file, in order to
3312 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3313 don't write the header file, and we unlink the data file. If writing the header
3314 file fails, we have failed to accept this message. */
3316 if (host_checking || blackholed_by != NULL)
3319 Uunlink(spool_name);
3320 msg_size = 0; /* Compute size for log line */
3321 for (h = header_list; h != NULL; h = h->next)
3322 if (h->type != '*') msg_size += h->slen;
3325 /* Write the -H file */
3329 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3331 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3332 Uunlink(spool_name); /* Lose the data file */
3336 smtp_reply = US"451 Error in writing spool file";
3337 message_id[0] = 0; /* Indicate no message accepted */
3342 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3343 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3345 /* Does not return */
3351 /* The message has now been successfully received. */
3353 receive_messagecount++;
3355 /* In SMTP sessions we may receive several in one connection. After each one,
3356 we wait for the clock to tick at the level of message-id granularity. This is
3357 so that the combination of time+pid is unique, even on systems where the pid
3358 can be re-used within our time interval. We can't shorten the interval without
3359 re-designing the message-id. See comments above where the message id is
3360 created. This is Something For The Future. */
3362 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3363 exim_wait_tick(&message_id_tv, id_resolution);
3365 /* Add data size to written header size. We do not count the initial file name
3366 that is in the file, but we do add one extra for the notional blank line that
3367 precedes the data. This total differs from message_size in that it include the
3368 added Received: header and any other headers that got created locally. */
3371 fstat(data_fd, &statbuf);
3373 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3375 /* Generate a "message received" log entry. We do this by building up a dynamic
3376 string as required. Since we commonly want to add two items at a time, use a
3377 macro to simplify the coding. We log the arrival of a new message while the
3378 file is still locked, just in case the machine is *really* fast, and delivers
3379 it first! Include any message id that is in the message - since the syntax of a
3380 message id is actually an addr-spec, we can use the parse routine to canonicize
3385 s = store_get(size);
3387 s = string_append(s, &size, &sptr, 2, US"<= ",
3388 (sender_address[0] == 0)? US"<>" : sender_address);
3389 if (message_reference != NULL)
3390 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3392 s = add_host_info_for_log(s, &size, &sptr);
3395 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3396 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3397 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3399 s = string_append(s, &size, &sptr, 2, US" CV=",
3400 tls_certificate_verified? "yes":"no");
3401 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3402 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3403 string_printing(tls_peerdn), US"\"");
3406 if (sender_host_authenticated != NULL)
3408 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3409 if (authenticated_id != NULL)
3410 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3413 sprintf(CS big_buffer, "%d", msg_size);
3414 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3416 /* If an addr-spec in a message-id contains a quoted string, it can contain
3417 any characters except " \ and CR and so in particular it can contain NL!
3418 Therefore, make sure we use a printing-characters only version for the log.
3419 Also, allow for domain literals in the message id. */
3421 if (msgid_header != NULL)
3424 BOOL save_allow_domain_literals = allow_domain_literals;
3425 allow_domain_literals = TRUE;
3426 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3427 &errmsg, &start, &end, &domain, FALSE);
3428 allow_domain_literals = save_allow_domain_literals;
3430 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3433 /* If subject logging is turned on, create suitable printing-character
3434 text. By expanding $h_subject: we make use of the MIME decoding. */
3436 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3439 uschar *p = big_buffer;
3440 uschar *ss = expand_string(US"$h_subject:");
3442 /* Backslash-quote any double quotes or backslashes so as to make a
3443 a C-like string, and turn any non-printers into escape sequences. */
3446 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3448 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3453 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3456 /* Terminate the string: string_cat() and string_append() leave room, but do
3457 not put the zero in. */
3461 /* Create a message log file if message logs are being used and this message is
3462 not blackholed. Write the reception stuff to it. We used to leave message log
3463 creation until the first delivery, but this has proved confusing for somep
3466 if (message_logs && blackholed_by == NULL)
3470 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3472 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3474 if (fd < 0 && errno == ENOENT)
3477 sprintf(CS temp, "msglog/%s", message_subdir);
3478 if (message_subdir[0] == 0) temp[6] = 0;
3479 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3480 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3485 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3486 spool_name, strerror(errno));
3491 FILE *message_log = fdopen(fd, "a");
3492 if (message_log == NULL)
3494 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3495 spool_name, strerror(errno));
3500 uschar *now = tod_stamp(tod_log);
3501 fprintf(message_log, "%s Received from %s\n", now, s+3);
3502 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3504 if (queue_only_policy) fprintf(message_log,
3505 "%s no immediate delivery: queued by %s\n", now, queued_by);
3506 (void)fclose(message_log);
3511 /* Everything has now been done for a successful message except logging its
3512 arrival, and outputting an SMTP response. While writing to the log, set a flag
3513 to cause a call to receive_bomb_out() if the log cannot be opened. */
3515 receive_call_bombout = TRUE;
3517 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3518 connection has gone away. This can only be done if there is no unconsumed input
3519 waiting in the local input buffer. We can test for this by calling
3520 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3521 input to be sent following the final dot, so the presence of following input is
3524 If the connection is still present, but there is no unread input for the
3525 socket, the result of a select() call will be zero. If, however, the connection
3526 has gone away, or if there is pending input, the result of select() will be
3527 non-zero. The two cases can be distinguished by trying to read the next input
3528 character. If we succeed, we can unread it so that it remains in the local
3529 buffer for handling later. If not, the connection has been lost.
3531 Of course, since TCP/IP is asynchronous, there is always a chance that the
3532 connection will vanish between the time of this test and the sending of the
3533 response, but the chance of this happening should be small. */
3535 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3536 !receive_smtp_buffered())
3539 fd_set select_check;
3540 FD_ZERO(&select_check);
3541 FD_SET(fileno(smtp_in), &select_check);
3545 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3547 int c = (RECEIVE_GETC)();
3548 if (c != EOF) (RECEIVE_UNGETC)(c); else
3550 uschar *msg = US"SMTP connection lost after final dot";
3551 smtp_reply = US""; /* No attempt to send a response */
3552 smtp_yield = FALSE; /* Nothing more on this connection */
3554 /* Re-use the log line workspace */
3557 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3558 s = add_host_info_for_log(s, &size, &sptr);
3560 log_write(0, LOG_MAIN, "%s", s);
3562 /* Delete the files for this aborted message. */
3564 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3565 message_subdir, message_id);
3566 Uunlink(spool_name);
3568 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3569 message_subdir, message_id);
3570 Uunlink(spool_name);
3572 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3573 message_subdir, message_id);
3574 Uunlink(spool_name);
3581 /* The connection has not gone away; we really are going to take responsibility
3582 for this message. */
3584 log_write(0, LOG_MAIN |
3585 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3586 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3588 receive_call_bombout = FALSE;
3590 /* Log any control actions taken by an ACL or local_scan(). */
3592 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3593 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3594 "no immediate delivery: queued by %s", queued_by);
3596 store_reset(s); /* The store for the main log message can be reused */
3598 /* If the message is frozen, and freeze_tell is set, do the telling. */
3600 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3602 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3603 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3604 message_id, frozen_by, sender_address);
3608 /* Either a message has been successfully received and written to the two spool
3609 files, or an error in writing the spool has occurred for an SMTP message, or
3610 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
3611 we will have already given up because there's no point in carrying on!) In
3612 either event, we must now close (and thereby unlock) the data file. In the
3613 successful case, this leaves the message on the spool, ready for delivery. In
3614 the error case, the spool file will be deleted. Then tidy up store, interact
3615 with an SMTP call if necessary, and return.
3617 A fflush() was done earlier in the expectation that any write errors on the
3618 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3619 possible for fclose() to fail - but what to do? What has happened to the lock
3623 process_info[process_info_len] = 0; /* Remove message id */
3624 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
3626 /* Now reset signal handlers to their defaults */
3628 signal(SIGTERM, SIG_DFL);
3629 signal(SIGINT, SIG_DFL);
3631 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3632 value, which defaults TRUE - meaning there may be more incoming messages from
3633 this connection. For non-SMTP callers (where there is only ever one message),
3634 the default is FALSE. */
3640 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3641 is set to the response that should be sent. When it is NULL, we generate
3642 default responses. After an ACL error or local_scan() error, the response has
3643 already been sent, and smtp_reply is an empty string to indicate this. */
3645 if (!smtp_batched_input)
3647 if (smtp_reply == NULL)
3649 if (fake_response != OK)
3650 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
3651 fake_response_text);
3653 /* An OK response is required; use "message" text if present. */
3655 else if (user_msg != NULL)
3657 uschar *code = US"250";
3659 smtp_message_code(&code, &len, &user_msg, NULL);
3660 smtp_respond(code, len, TRUE, user_msg);
3663 /* Default OK response */
3666 smtp_printf("250 OK id=%s\r\n", message_id);
3669 "\n**** SMTP testing: that is not a real message id!\n\n");
3672 /* smtp_reply is set non-empty */
3674 else if (smtp_reply[0] != 0)
3676 if (fake_response != OK && (smtp_reply[0] == '2'))
3677 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
3678 fake_response_text);
3680 smtp_printf("%.1024s\r\n", smtp_reply);
3684 /* For batched SMTP, generate an error message on failure, and do
3685 nothing on success. The function moan_smtp_batch() does not return -
3686 it exits from the program with a non-zero return code. */
3688 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
3692 /* If blackholing, we can immediately log this message's sad fate. The data
3693 file has already been unlinked, and the header file was never written to disk.
3694 We must now indicate that nothing was received, to prevent a delivery from
3697 if (blackholed_by != NULL)
3699 uschar *detail = (local_scan_data != NULL)?
3700 string_printing(local_scan_data) :
3701 string_sprintf("(%s discarded recipients)", blackholed_by);
3702 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
3703 log_write(0, LOG_MAIN, "Completed");
3707 /* Reset headers so that logging of rejects for a subsequent message doesn't
3708 include them. It is also important to set header_last = NULL before exiting
3709 from this function, as this prevents certain rewrites that might happen during
3710 subsequent verifying (of another incoming message) from trying to add headers
3711 when they shouldn't. */
3713 header_list = header_last = NULL;
3715 return yield; /* TRUE if more messages (SMTP only) */
3718 /* End of receive.c */