1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
12 #ifdef EXPERIMENTAL_DCC
16 /*************************************************
17 * Local static variables *
18 *************************************************/
20 static FILE *data_file = NULL;
21 static int data_fd = -1;
22 static uschar spool_name[256];
26 /*************************************************
27 * Non-SMTP character reading functions *
28 *************************************************/
30 /* These are the default functions that are set up in the variables such as
31 receive_getc initially. They just call the standard functions, passing stdin as
32 the file. (When SMTP input is occurring, different functions are used by
33 changing the pointer variables.) */
44 return ungetc(c, stdin);
62 /*************************************************
63 * Check that a set sender is allowed *
64 *************************************************/
66 /* This function is called when a local caller sets an explicit sender address.
67 It checks whether this is permitted, which it is for trusted callers.
68 Otherwise, it must match the pattern(s) in untrusted_set_sender.
70 Arguments: the proposed sender address
71 Returns: TRUE for a trusted caller
72 TRUE if the address has been set, untrusted_set_sender has been
73 set, and the address matches something in the list
78 receive_check_set_sender(uschar *newsender)
81 if (trusted_caller) return TRUE;
82 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
83 qnewsender = (Ustrchr(newsender, '@') != NULL)?
84 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
86 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
93 /*************************************************
94 * Read space info for a partition *
95 *************************************************/
97 /* This function is called by receive_check_fs() below, and also by string
98 expansion for variables such as $spool_space. The field names for the statvfs
99 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
100 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
101 have inodes, and they return -1 for the number available.
103 Later: It turns out that some file systems that do not have the concept of
104 inodes return 0 rather than -1. Such systems should also return 0 for the total
105 number of inodes, so we require that to be greater than zero before returning
109 isspool TRUE for spool partition, FALSE for log partition
110 inodeptr address of int to receive inode count; -1 if there isn't one
112 Returns: available on-root space, in kilobytes
113 -1 for log partition if there isn't one
115 All values are -1 if the STATFS functions are not available.
119 receive_statvfs(BOOL isspool, int *inodeptr)
122 struct STATVFS statbuf;
127 /* The spool directory must always exist. */
131 path = spool_directory;
135 /* Need to cut down the log file path to the directory, and to ignore any
136 appearance of "syslog" in it. */
140 int sep = ':'; /* Not variable - outside scripts use */
141 uschar *p = log_file_path;
144 /* An empty log_file_path means "use the default". This is the same as an
145 empty item in a list. */
147 if (*p == 0) p = US":";
148 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
150 if (Ustrcmp(path, "syslog") != 0) break;
153 if (path == NULL) /* No log files */
159 /* An empty string means use the default, which is in the spool directory.
160 But don't just use the spool directory, as it is possible that the log
161 subdirectory has been symbolically linked elsewhere. */
165 sprintf(CS buffer, CS"%s/log", CS spool_directory);
171 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
175 /* We now have the path; do the business */
177 memset(&statbuf, 0, sizeof(statbuf));
179 if (STATVFS(CS path, &statbuf) != 0)
181 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
182 "%s directory %s: %s", name, spool_directory, strerror(errno));
183 smtp_closedown(US"spool or log directory problem");
184 exim_exit(EXIT_FAILURE);
187 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
189 /* Disks are getting huge. Take care with computing the size in kilobytes. */
191 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
193 /* Unable to find partition sizes in this environment. */
204 /*************************************************
205 * Check space on spool and log partitions *
206 *************************************************/
208 /* This function is called before accepting a message; if any thresholds are
209 set, it checks them. If a message_size is supplied, it checks that there is
210 enough space for that size plus the threshold - i.e. that the message won't
211 reduce the space to the threshold. Not all OS have statvfs(); for those that
212 don't, this function always returns TRUE. For some OS the old function and
213 struct name statfs is used; that is handled by a macro, defined in exim.h.
216 msg_size the (estimated) size of an incoming message
218 Returns: FALSE if there isn't enough space, or if the information cannot
220 TRUE if no check was done or there is enough space
224 receive_check_fs(int msg_size)
228 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
230 space = receive_statvfs(TRUE, &inodes);
233 debug_printf("spool directory space = %dK inodes = %d "
234 "check_space = %dK inodes = %d msg_size = %d\n",
235 space, inodes, check_spool_space, check_spool_inodes, msg_size);
237 if ((space >= 0 && space < check_spool_space) ||
238 (inodes >= 0 && inodes < check_spool_inodes))
240 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
241 "inodes=%d", space, inodes);
246 if (check_log_space > 0 || check_log_inodes > 0)
248 space = receive_statvfs(FALSE, &inodes);
251 debug_printf("log directory space = %dK inodes = %d "
252 "check_space = %dK inodes = %d\n",
253 space, inodes, check_log_space, check_log_inodes);
255 if ((space >= 0 && space < check_log_space) ||
256 (inodes >= 0 && inodes < check_log_inodes))
258 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
259 "inodes=%d", space, inodes);
269 /*************************************************
270 * Bomb out while reading a message *
271 *************************************************/
273 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
274 received, or if there is a timeout. A rarer case might be if the log files are
275 screwed up and Exim can't open them to record a message's arrival. Handling
276 that case is done by setting a flag to cause the log functions to call this
277 function if there is an ultimate disaster. That is why it is globally
281 reason text reason to pass to the not-quit ACL
282 msg default SMTP response to give if in an SMTP session
287 receive_bomb_out(uschar *reason, uschar *msg)
289 /* If spool_name is set, it contains the name of the data file that is being
290 written. Unlink it before closing so that it cannot be picked up by a delivery
291 process. Ensure that any header file is also removed. */
293 if (spool_name[0] != 0)
296 spool_name[Ustrlen(spool_name) - 1] = 'H';
300 /* Now close the file if it is open, either as a fd or a stream. */
302 if (data_file != NULL) (void)fclose(data_file);
303 else if (data_fd >= 0) (void)close(data_fd);
305 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
306 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
311 if (smtp_batched_input)
312 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
313 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
314 smtp_active_hostname, msg);
317 /* Exit from the program (non-BSMTP cases) */
319 exim_exit(EXIT_FAILURE);
323 /*************************************************
324 * Data read timeout *
325 *************************************************/
327 /* Handler function for timeouts that occur while reading the data that
330 Argument: the signal number
335 data_timeout_handler(int sig)
339 sig = sig; /* Keep picky compilers happy */
343 msg = US"SMTP incoming data timeout";
344 log_write(L_lost_incoming_connection,
345 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
347 (sender_fullhost != NULL)? sender_fullhost : US"local process",
352 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
353 log_write(L_lost_incoming_connection,
354 LOG_MAIN, "timed out while reading local message");
357 receive_bomb_out(US"data-timeout", msg); /* Does not return */
362 /*************************************************
363 * local_scan() timeout *
364 *************************************************/
366 /* Handler function for timeouts that occur while running a local_scan()
369 Argument: the signal number
374 local_scan_timeout_handler(int sig)
376 sig = sig; /* Keep picky compilers happy */
377 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
378 "message temporarily rejected (size %d)", message_size);
379 /* Does not return */
380 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
385 /*************************************************
386 * local_scan() crashed *
387 *************************************************/
389 /* Handler function for signals that occur while running a local_scan()
392 Argument: the signal number
397 local_scan_crash_handler(int sig)
399 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
400 "signal %d - message temporarily rejected (size %d)", sig, message_size);
401 /* Does not return */
402 receive_bomb_out(US"local-scan-error", US"local verification problem");
406 /*************************************************
407 * SIGTERM or SIGINT received *
408 *************************************************/
410 /* Handler for SIGTERM or SIGINT signals that occur while reading the
411 data that comprises a message.
413 Argument: the signal number
418 data_sigterm_sigint_handler(int sig)
424 msg = US"Service not available - SIGTERM or SIGINT received";
425 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
426 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
430 if (filter_test == FTEST_NONE)
432 fprintf(stderr, "\nexim: %s received - message abandoned\n",
433 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
434 log_write(0, LOG_MAIN, "%s received while reading local message",
435 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
439 receive_bomb_out(US"signal-exit", msg); /* Does not return */
444 /*************************************************
445 * Add new recipient to list *
446 *************************************************/
448 /* This function builds a list of recipient addresses in argc/argv
452 recipient the next address to add to recipients_list
453 pno parent number for fixed aliases; -1 otherwise
459 receive_add_recipient(uschar *recipient, int pno)
461 if (recipients_count >= recipients_list_max)
463 recipient_item *oldlist = recipients_list;
464 int oldmax = recipients_list_max;
465 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
466 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
468 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
471 recipients_list[recipients_count].address = recipient;
472 recipients_list[recipients_count].pno = pno;
473 #ifdef EXPERIMENTAL_BRIGHTMAIL
474 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
475 /* reset optin string pointer for next recipient */
476 bmi_current_optin = NULL;
478 recipients_list[recipients_count++].errors_to = NULL;
484 /*************************************************
485 * Remove a recipient from the list *
486 *************************************************/
488 /* This function is provided for local_scan() to use.
491 recipient address to remove
493 Returns: TRUE if it did remove something; FALSE otherwise
497 receive_remove_recipient(uschar *recipient)
500 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
502 for (count = 0; count < recipients_count; count++)
504 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
506 if ((--recipients_count - count) > 0)
507 memmove(recipients_list + count, recipients_list + count + 1,
508 (recipients_count - count)*sizeof(recipient_item));
519 /*************************************************
520 * Read data portion of a non-SMTP message *
521 *************************************************/
523 /* This function is called to read the remainder of a message (following the
524 header) when the input is not from SMTP - we are receiving a local message on
525 a standard input stream. The message is always terminated by EOF, and is also
526 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
527 two cases for maximum efficiency.
529 Ensure that the body ends with a newline. This will naturally be the case when
530 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
531 as "sequences of lines" - this of course strictly applies only to SMTP, but
532 deliveries into BSD-type mailbox files also require it. Exim used to have a
533 flag for doing this at delivery time, but as it was always set for all
534 transports, I decided to simplify things by putting the check here instead.
536 There is at least one MUA (dtmail) that sends CRLF via this interface, and
537 other programs are known to do this as well. Exim used to have a option for
538 dealing with this: in July 2003, after much discussion, the code has been
539 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
541 However, for the case when a dot on a line by itself terminates a message, the
542 only recognized terminating sequences before and after the dot are LF and CRLF.
543 Otherwise, having read EOL . CR, you don't know whether to read another
546 Internally, in messages stored in Exim's spool files, LF is used as the line
547 terminator. Under the new regime, bare CRs will no longer appear in these
551 fout a FILE to which to write the message
553 Returns: One of the END_xxx values indicating why it stopped reading
557 read_message_data(FILE *fout)
561 register int linelength = 0;
563 /* Handle the case when only EOF terminates the message */
567 register int last_ch = '\n';
569 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
571 if (ch == 0) body_zerocount++;
572 if (last_ch == '\r' && ch != '\n')
574 if (linelength > max_received_linelength)
575 max_received_linelength = linelength;
577 if (fputc('\n', fout) == EOF) return END_WERROR;
581 if (ch == '\r') continue;
583 if (fputc(ch, fout) == EOF) return END_WERROR;
586 if (linelength > max_received_linelength)
587 max_received_linelength = linelength;
592 if (++message_size > thismessage_size_limit) return END_SIZE;
597 if (linelength > max_received_linelength)
598 max_received_linelength = linelength;
599 if (fputc('\n', fout) == EOF) return END_WERROR;
607 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
611 while ((ch = (receive_getc)()) != EOF)
613 if (ch == 0) body_zerocount++;
616 case 0: /* Normal state (previous char written) */
620 if (linelength > max_received_linelength)
621 max_received_linelength = linelength;
626 { ch_state = 2; continue; }
629 case 1: /* After written "\n" */
630 if (ch == '.') { ch_state = 3; continue; }
631 if (ch != '\n') ch_state = 0; else linelength = -1;
635 body_linecount++; /* After unwritten "\r" */
636 if (linelength > max_received_linelength)
637 max_received_linelength = linelength;
645 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
646 if (ch == '\r') continue;
652 case 3: /* After "\n." (\n written, dot not) */
653 if (ch == '\n') return END_DOT;
654 if (ch == '\r') { ch_state = 4; continue; }
657 if (fputc('.', fout) == EOF) return END_WERROR;
661 case 4: /* After "\n.\r" (\n written, rest not) */
662 if (ch == '\n') return END_DOT;
665 if (fputs(".\n", fout) == EOF) return END_WERROR;
666 if (ch == '\r') { ch_state = 2; continue; }
672 if (fputc(ch, fout) == EOF) return END_WERROR;
673 if (++message_size > thismessage_size_limit) return END_SIZE;
676 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
677 the message ends with a newline, and we must also write any characters that
678 were saved up while testing for an ending dot. */
682 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
683 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
684 message_size += Ustrlen(ends[ch_state]);
694 /*************************************************
695 * Read data portion of an SMTP message *
696 *************************************************/
698 /* This function is called to read the remainder of an SMTP message (after the
699 headers), or to skip over it when an error has occurred. In this case, the
700 output file is passed as NULL.
702 If any line begins with a dot, that character is skipped. The input should only
703 be successfully terminated by CR LF . CR LF unless it is local (non-network)
704 SMTP, in which case the CRs are optional, but...
706 FUDGE: It seems that sites on the net send out messages with just LF
707 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
708 we make the CRs optional in all cases.
710 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
711 well, so that there are no CRs in spooled messages. However, the message
712 terminating dot is not recognized between two bare CRs.
715 fout a FILE to which to write the message; NULL if skipping
717 Returns: One of the END_xxx values indicating why it stopped reading
719 /*XXX cutthrough - need to copy to destination, not including the
720 terminating dot, canonicalizing newlines.
724 read_message_data_smtp(FILE *fout)
728 register int linelength = 0;
730 while ((ch = (receive_getc)()) != EOF)
732 if (ch == 0) body_zerocount++;
735 case 0: /* After LF or CRLF */
739 continue; /* Don't ever write . after LF */
743 /* Else fall through to handle as normal uschar. */
745 case 1: /* Normal state */
750 if (linelength > max_received_linelength)
751 max_received_linelength = linelength;
761 case 2: /* After (unwritten) CR */
763 if (linelength > max_received_linelength)
764 max_received_linelength = linelength;
773 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
774 (void) cutthrough_put_nl();
775 if (ch != '\r') ch_state = 1; else continue;
779 case 3: /* After [CR] LF . */
787 ch_state = 1; /* The dot itself is removed */
790 case 4: /* After [CR] LF . CR */
791 if (ch == '\n') return END_DOT;
794 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
795 (void) cutthrough_put_nl();
805 /* Add the character to the spool file, unless skipping; then loop for the
812 if (fputc(ch, fout) == EOF) return END_WERROR;
813 if (message_size > thismessage_size_limit) return END_SIZE;
816 (void) cutthrough_put_nl();
820 (void) cutthrough_puts(&c, 1);
824 /* Fall through here if EOF encountered. This indicates some kind of error,
825 since a correct message is terminated by [CR] LF . [CR] LF. */
833 /*************************************************
834 * Swallow SMTP message *
835 *************************************************/
837 /* This function is called when there has been some kind of error while reading
838 an SMTP message, and the remaining data may need to be swallowed. It is global
839 because it is called from smtp_closedown() to shut down an incoming call
842 Argument: a FILE from which to read the message
847 receive_swallow_smtp(void)
849 if (message_ended >= END_NOTENDED)
850 message_ended = read_message_data_smtp(NULL);
855 /*************************************************
856 * Handle lost SMTP connection *
857 *************************************************/
859 /* This function logs connection loss incidents and generates an appropriate
862 Argument: additional data for the message
863 Returns: the SMTP response
867 handle_lost_connection(uschar *s)
869 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
870 "%s lost while reading message data%s", smtp_get_connection_info(), s);
871 return US"421 Lost incoming connection";
877 /*************************************************
878 * Handle a non-smtp reception error *
879 *************************************************/
881 /* This function is called for various errors during the reception of non-SMTP
882 messages. It either sends a message to the sender of the problem message, or it
883 writes to the standard error stream.
886 errcode code for moan_to_sender(), identifying the error
887 text1 first message text, passed to moan_to_sender()
888 text2 second message text, used only for stderrr
889 error_rc code to pass to exim_exit if no problem
890 f FILE containing body of message (may be stdin)
891 hptr pointer to instore headers or NULL
893 Returns: calls exim_exit(), which does not return
897 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
898 FILE *f, header_line *hptr)
900 if (error_handling == ERRORS_SENDER)
904 eblock.text1 = text1;
905 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
906 error_rc = EXIT_FAILURE;
908 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
915 /*************************************************
916 * Add header lines set up by ACL *
917 *************************************************/
919 /* This function is called to add the header lines that were set up by
920 statements in an ACL to the list of headers in memory. It is done in two stages
921 like this, because when the ACL for RCPT is running, the other headers have not
922 yet been received. This function is called twice; once just before running the
923 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
924 are visible to the DATA ACL.
926 Originally these header lines were added at the end. Now there is support for
927 three different places: top, bottom, and after the Received: header(s). There
928 will always be at least one Received: header, even if it is marked deleted, and
929 even if something else has been put in front of it.
932 acl_name text to identify which ACL
938 add_acl_headers(uschar *acl_name)
940 header_line *h, *next;
941 header_line *last_received = NULL;
943 if (acl_added_headers == NULL) return;
944 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
946 for (h = acl_added_headers; h != NULL; h = next)
953 h->next = header_list;
955 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
959 if (last_received == NULL)
961 last_received = header_list;
962 while (!header_testname(last_received, US"Received", 8, FALSE))
963 last_received = last_received->next;
964 while (last_received->next != NULL &&
965 header_testname(last_received->next, US"Received", 8, FALSE))
966 last_received = last_received->next;
968 h->next = last_received->next;
969 last_received->next = h;
970 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
974 /* add header before any header which is NOT Received: or Resent- */
975 last_received = header_list;
976 while ( (last_received->next != NULL) &&
977 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
978 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
979 last_received = last_received->next;
980 /* last_received now points to the last Received: or Resent-* header
981 in an uninterrupted chain of those header types (seen from the beginning
982 of all headers. Our current header must follow it. */
983 h->next = last_received->next;
984 last_received->next = h;
985 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
990 header_last->next = h;
994 if (h->next == NULL) header_last = h;
996 /* Check for one of the known header types (From:, To:, etc.) though in
997 practice most added headers are going to be "other". Lower case
998 identification letters are never stored with the header; they are used
999 for existence tests when messages are received. So discard any lower case
1002 h->type = header_checkname(h, FALSE);
1003 if (h->type >= 'a') h->type = htype_other;
1005 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1008 acl_added_headers = NULL;
1009 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1014 /*************************************************
1015 * Add host information for log line *
1016 *************************************************/
1018 /* Called for acceptance and rejecting log lines. This adds information about
1019 the calling host to a string that is being built dynamically.
1022 s the dynamic string
1023 sizeptr points to the size variable
1024 ptrptr points to the pointer variable
1026 Returns: the extended string
1030 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1032 if (sender_fullhost != NULL)
1034 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1035 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1036 interface_address != NULL)
1038 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1040 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1043 if (sender_ident != NULL)
1044 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1045 if (received_protocol != NULL)
1046 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1052 #ifdef WITH_CONTENT_SCAN
1054 /*************************************************
1055 * Run the MIME ACL on a message *
1056 *************************************************/
1058 /* This code is in a subroutine so that it can be used for both SMTP
1059 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1062 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1063 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1064 smtp_reply_ptr Where SMTP reply is being built
1065 blackholed_by_ptr Where "blackholed by" message is being built
1067 Returns: TRUE to carry on; FALSE to abandon the message
1071 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1072 uschar **blackholed_by_ptr)
1075 uschar rfc822_file_path[2048];
1076 unsigned long mbox_size;
1077 header_line *my_headerlist;
1078 uschar *user_msg, *log_msg;
1079 int mime_part_count_buffer = -1;
1082 memset(CS rfc822_file_path,0,2048);
1084 /* check if it is a MIME message */
1085 my_headerlist = header_list;
1086 while (my_headerlist != NULL)
1088 /* skip deleted headers */
1089 if (my_headerlist->type == '*')
1091 my_headerlist = my_headerlist->next;
1094 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1096 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1099 my_headerlist = my_headerlist->next;
1102 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1106 /* make sure the eml mbox file is spooled up */
1107 mbox_file = spool_mbox(&mbox_size, NULL);
1108 if (mbox_file == NULL) {
1109 /* error while spooling */
1110 log_write(0, LOG_MAIN|LOG_PANIC,
1111 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1112 Uunlink(spool_name);
1114 #ifdef EXPERIMENTAL_DCC
1117 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1118 message_id[0] = 0; /* Indicate no message accepted */
1119 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1120 return FALSE; /* Indicate skip to end of receive function */
1126 mime_part_count = -1;
1127 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1128 (void)fclose(mbox_file);
1130 if (Ustrlen(rfc822_file_path) > 0)
1132 mime_part_count = mime_part_count_buffer;
1134 if (unlink(CS rfc822_file_path) == -1)
1136 log_write(0, LOG_PANIC,
1137 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1142 /* check if we must check any message/rfc822 attachments */
1145 uschar temp_path[1024];
1147 struct dirent *entry;
1150 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1153 tempdir = opendir(CS temp_path);
1157 entry = readdir(tempdir);
1158 if (entry == NULL) break;
1159 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1161 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1162 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1170 mbox_file = Ufopen(rfc822_file_path,"rb");
1171 if (mbox_file == NULL)
1173 log_write(0, LOG_PANIC,
1174 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1175 unlink(CS rfc822_file_path);
1178 /* set RFC822 expansion variable */
1180 mime_part_count_buffer = mime_part_count;
1181 goto MIME_ACL_CHECK;
1186 add_acl_headers(US"MIME");
1189 recipients_count = 0;
1190 *blackholed_by_ptr = US"MIME ACL";
1194 Uunlink(spool_name);
1196 #ifdef EXPERIMENTAL_DCC
1199 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1200 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1201 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1202 message_id[0] = 0; /* Indicate no message accepted */
1203 return FALSE; /* Cause skip to end of receive function */
1209 #endif /* WITH_CONTENT_SCAN */
1214 received_header_gen(void)
1218 header_line *received_header= header_list;
1220 timestamp = expand_string(US"${tod_full}");
1221 if (recipients_count == 1) received_for = recipients_list[0].address;
1222 received = expand_string(received_header_text);
1223 received_for = NULL;
1225 if (received == NULL)
1227 if(spool_name[0] != 0)
1228 Uunlink(spool_name); /* Lose the data file */
1229 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1230 "(received_header_text) failed: %s", string_printing(received_header_text),
1231 expand_string_message);
1234 /* The first element on the header chain is reserved for the Received header,
1235 so all we have to do is fill in the text pointer, and set the type. However, if
1236 the result of the expansion is an empty string, we leave the header marked as
1237 "old" so as to refrain from adding a Received header. */
1239 if (received[0] == 0)
1241 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1242 received_header->type = htype_old;
1246 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1247 received_header->type = htype_received;
1250 received_header->slen = Ustrlen(received_header->text);
1252 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1253 received_header->type, received_header->text);
1258 /*************************************************
1260 *************************************************/
1262 /* Receive a message on the given input, and put it into a pair of spool files.
1263 Either a non-null list of recipients, or the extract flag will be true, or
1264 both. The flag sender_local is true for locally generated messages. The flag
1265 submission_mode is true if an ACL has obeyed "control = submission". The flag
1266 suppress_local_fixups is true if an ACL has obeyed "control =
1267 suppress_local_fixups" or -G was passed on the command-line.
1268 The flag smtp_input is true if the message is to be
1269 handled using SMTP conventions about termination and lines starting with dots.
1270 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1272 If a message was successfully read, message_id[0] will be non-zero.
1274 The general actions of this function are:
1276 . Read the headers of the message (if any) into a chain of store
1279 . If there is a "sender:" header and the message is locally originated,
1280 throw it away, unless the caller is trusted, or unless
1281 active_local_sender_retain is set - which can only happen if
1282 active_local_from_check is false.
1284 . If recipients are to be extracted from the message, build the
1285 recipients list from the headers, removing any that were on the
1286 original recipients list (unless extract_addresses_remove_arguments is
1287 false), and at the same time, remove any bcc header that may be present.
1289 . Get the spool file for the data, sort out its unique name, open
1290 and lock it (but don't give it the name yet).
1292 . Generate a "Message-Id" header if the message doesn't have one, for
1293 locally-originated messages.
1295 . Generate a "Received" header.
1297 . Ensure the recipients list is fully qualified and rewritten if necessary.
1299 . If there are any rewriting rules, apply them to the sender address
1300 and also to the headers.
1302 . If there is no from: header, generate one, for locally-generated messages
1303 and messages in "submission mode" only.
1305 . If the sender is local, check that from: is correct, and if not, generate
1306 a Sender: header, unless message comes from a trusted caller, or this
1307 feature is disabled by active_local_from_check being false.
1309 . If there is no "date" header, generate one, for locally-originated
1310 or submission mode messages only.
1312 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1313 dot_ends mode, to the data file. Leave it open, to hold the lock.
1315 . Write the envelope and the headers to a new file.
1317 . Set the name for the header file; close it.
1319 . Set the name for the data file; close it.
1321 Because this function can potentially be called many times in a single
1322 SMTP connection, all store should be got by store_get(), so that it will be
1323 automatically retrieved after the message is accepted.
1325 FUDGE: It seems that sites on the net send out messages with just LF
1326 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1327 we make the CRs optional in all cases.
1329 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1330 new regime is now in place in which bare CRs in header lines are turned into LF
1331 followed by a space, so as not to terminate the header line.
1333 February 2004: A bare LF in a header line in a message whose first line was
1334 terminated by CRLF is treated in the same way as a bare CR.
1337 extract_recip TRUE if recipients are to be extracted from the message's
1340 Returns: TRUE there are more messages to be read (SMTP input)
1341 FALSE there are no more messages to be read (non-SMTP input
1342 or SMTP connection collapsed, or other failure)
1344 When reading a message for filter testing, the returned value indicates
1345 whether the headers (which is all that is read) were terminated by '.' or
1349 receive_msg(BOOL extract_recip)
1354 int process_info_len = Ustrlen(process_info);
1355 int error_rc = (error_handling == ERRORS_SENDER)?
1356 errors_sender_rc : EXIT_FAILURE;
1357 int header_size = 256;
1358 int start, end, domain, size, sptr;
1361 int prevlines_length = 0;
1363 register int ptr = 0;
1365 BOOL contains_resent_headers = FALSE;
1366 BOOL extracted_ignored = FALSE;
1367 BOOL first_line_ended_crlf = TRUE_UNSET;
1368 BOOL smtp_yield = TRUE;
1371 BOOL resents_exist = FALSE;
1372 uschar *resent_prefix = US"";
1373 uschar *blackholed_by = NULL;
1374 uschar *blackhole_log_msg = US"";
1377 error_block *bad_addresses = NULL;
1379 uschar *frozen_by = NULL;
1380 uschar *queued_by = NULL;
1383 struct stat statbuf;
1385 /* Final message to give to SMTP caller, and messages from ACLs */
1387 uschar *smtp_reply = NULL;
1388 uschar *user_msg, *log_msg;
1390 /* Working header pointers */
1392 header_line *h, *next;
1394 /* Flags for noting the existence of certain headers (only one left) */
1396 BOOL date_header_exists = FALSE;
1398 /* Pointers to receive the addresses of headers whose contents we need. */
1400 header_line *from_header = NULL;
1401 header_line *subject_header = NULL;
1402 header_line *msgid_header = NULL;
1403 header_line *received_header;
1405 /* Variables for use when building the Received: header. */
1410 /* Release any open files that might have been cached while preparing to
1411 accept the message - e.g. by verifying addresses - because reading a message
1412 might take a fair bit of real time. */
1416 /* Extracting the recipient list from an input file is incompatible with
1417 cutthrough delivery with the no-spool option. It shouldn't be possible
1418 to set up the combination, but just in case kill any ongoing connection. */
1419 /*XXX add no-spool */
1420 if (extract_recip || !smtp_input)
1421 cancel_cutthrough_connection();
1423 /* Initialize the chain of headers by setting up a place-holder for Received:
1424 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1425 pointing to the end of the chain to make adding headers simple. */
1427 received_header = header_list = header_last = store_get(sizeof(header_line));
1428 header_list->next = NULL;
1429 header_list->type = htype_old;
1430 header_list->text = NULL;
1431 header_list->slen = 0;
1433 /* Control block for the next header to be read. */
1435 next = store_get(sizeof(header_line));
1436 next->text = store_get(header_size);
1438 /* Initialize message id to be null (indicating no message read), and the
1439 header names list to be the normal list. Indicate there is no data file open
1440 yet, initialize the size and warning count, and deal with no size limit. */
1448 received_count = 1; /* For the one we will add */
1450 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1452 /* While reading the message, the following counts are computed. */
1454 message_linecount = body_linecount = body_zerocount =
1455 max_received_linelength = 0;
1457 #ifndef DISABLE_DKIM
1458 /* Call into DKIM to set up the context. */
1459 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1462 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1463 ids, and fractions of a second are required. See the comments that precede the
1464 message id creation below. */
1466 (void)gettimeofday(&message_id_tv, NULL);
1468 /* For other uses of the received time we can operate with granularity of one
1469 second, and for that we use the global variable received_time. This is for
1470 things like ultimate message timeouts. */
1472 received_time = message_id_tv.tv_sec;
1474 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1475 happen in the smtp_getc() function when it refills its buffer. */
1477 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1479 /* If not SMTP input, timeout happens only if configured, and we just set a
1480 single timeout for the whole message. */
1482 else if (receive_timeout > 0)
1484 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1485 alarm(receive_timeout);
1488 /* SIGTERM and SIGINT are caught always. */
1490 signal(SIGTERM, data_sigterm_sigint_handler);
1491 signal(SIGINT, data_sigterm_sigint_handler);
1493 /* Header lines in messages are not supposed to be very long, though when
1494 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1495 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1496 storing the header, and extend this as necessary using string_cat().
1498 To cope with total lunacies, impose an upper limit on the length of the header
1499 section of the message, as otherwise the store will fill up. We must also cope
1500 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1501 Folded header lines are joined into one string, leaving the '\n' characters
1502 inside them, so that writing them out reproduces the input.
1504 Loop for each character of each header; the next structure for chaining the
1505 header is set up already, with ptr the offset of the next character in
1510 int ch = (receive_getc)();
1512 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1513 SMTP must have a correct "." terminator. */
1515 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1517 smtp_reply = handle_lost_connection(US" (header)");
1519 goto TIDYUP; /* Skip to end of function */
1522 /* See if we are at the current header's size limit - there must be at least
1523 four bytes left. This allows for the new character plus a zero, plus two for
1524 extra insertions when we are playing games with dots and carriage returns. If
1525 we are at the limit, extend the text buffer. This could have been done
1526 automatically using string_cat() but because this is a tightish loop storing
1527 only one character at a time, we choose to do it inline. Normally
1528 store_extend() will be able to extend the block; only at the end of a big
1529 store block will a copy be needed. To handle the case of very long headers
1530 (and sometimes lunatic messages can have ones that are 100s of K long) we
1531 call store_release() for strings that have been copied - if the string is at
1532 the start of a block (and therefore the only thing in it, because we aren't
1533 doing any other gets), the block gets freed. We can only do this because we
1534 know there are no other calls to store_get() going on. */
1536 if (ptr >= header_size - 4)
1538 int oldsize = header_size;
1539 /* header_size += 256; */
1541 if (!store_extend(next->text, oldsize, header_size))
1543 uschar *newtext = store_get(header_size);
1544 memcpy(newtext, next->text, ptr);
1545 store_release(next->text);
1546 next->text = newtext;
1550 /* Cope with receiving a binary zero. There is dispute about whether
1551 these should be allowed in RFC 822 messages. The middle view is that they
1552 should not be allowed in headers, at least. Exim takes this attitude at
1553 the moment. We can't just stomp on them here, because we don't know that
1554 this line is a header yet. Set a flag to cause scanning later. */
1556 if (ch == 0) had_zero++;
1558 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1559 those from data files use just LF. Treat LF in local SMTP input as a
1560 terminator too. Treat EOF as a line terminator always. */
1562 if (ch == EOF) goto EOL;
1564 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1565 other MTAs accept this. We are therefore forced into this "liberalisation"
1566 too, so we accept LF as a line terminator whatever the source of the message.
1567 However, if the first line of the message ended with a CRLF, we treat a bare
1568 LF specially by inserting a white space after it to ensure that the header
1569 line is not terminated. */
1573 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1574 else if (first_line_ended_crlf) receive_ungetc(' ');
1578 /* This is not the end of the line. If this is SMTP input and this is
1579 the first character in the line and it is a "." character, ignore it.
1580 This implements the dot-doubling rule, though header lines starting with
1581 dots aren't exactly common. They are legal in RFC 822, though. If the
1582 following is CRLF or LF, this is the line that that terminates the
1583 entire message. We set message_ended to indicate this has happened (to
1584 prevent further reading), and break out of the loop, having freed the
1585 empty header, and set next = NULL to indicate no data line. */
1587 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1589 ch = (receive_getc)();
1592 ch = (receive_getc)();
1596 ch = '\r'; /* Revert to CR */
1601 message_ended = END_DOT;
1604 break; /* End character-reading loop */
1607 /* For non-SMTP input, the dot at the start of the line was really a data
1608 character. What is now in ch is the following character. We guaranteed
1609 enough space for this above. */
1613 next->text[ptr++] = '.';
1618 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1619 remember this case if this is the first line ending. */
1623 ch = (receive_getc)();
1626 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1630 /* Otherwise, put back the character after CR, and turn the bare CR
1633 ch = (receive_ungetc)(ch);
1634 next->text[ptr++] = '\n';
1639 /* We have a data character for the header line. */
1641 next->text[ptr++] = ch; /* Add to buffer */
1642 message_size++; /* Total message size so far */
1644 /* Handle failure due to a humungously long header section. The >= allows
1645 for the terminating \n. Add what we have so far onto the headers list so
1646 that it gets reflected in any error message, and back up the just-read
1649 if (message_size >= header_maxsize)
1651 next->text[ptr] = 0;
1653 next->type = htype_other;
1655 header_last->next = next;
1658 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1659 "%s (more than %d characters): message abandoned",
1660 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1664 smtp_reply = US"552 Message header is ridiculously long";
1665 receive_swallow_smtp();
1666 goto TIDYUP; /* Skip to end of function */
1671 give_local_error(ERRMESS_VLONGHEADER,
1672 string_sprintf("message header longer than %d characters received: "
1673 "message not accepted", header_maxsize), US"", error_rc, stdin,
1675 /* Does not return */
1679 continue; /* With next input character */
1681 /* End of header line reached */
1685 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1687 receive_linecount++;
1688 message_linecount++;
1690 /* Keep track of maximum line length */
1692 if (ptr - prevlines_length > max_received_linelength)
1693 max_received_linelength = ptr - prevlines_length;
1694 prevlines_length = ptr + 1;
1696 /* Now put in the terminating newline. There is always space for
1697 at least two more characters. */
1699 next->text[ptr++] = '\n';
1702 /* A blank line signals the end of the headers; release the unwanted
1703 space and set next to NULL to indicate this. */
1712 /* There is data in the line; see if the next input character is a
1713 whitespace character. If it is, we have a continuation of this header line.
1714 There is always space for at least one character at this point. */
1718 int nextch = (receive_getc)();
1719 if (nextch == ' ' || nextch == '\t')
1721 next->text[ptr++] = nextch;
1723 continue; /* Iterate the loop */
1725 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1726 else ch = EOF; /* Cause main loop to exit at end */
1729 /* We have got to the real line end. Terminate the string and release store
1730 beyond it. If it turns out to be a real header, internal binary zeros will
1731 be squashed later. */
1733 next->text[ptr] = 0;
1735 store_reset(next->text + ptr + 1);
1737 /* Check the running total size against the overall message size limit. We
1738 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1739 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1740 headers - the code to read the body will then also hit the buffer. */
1742 if (message_size > thismessage_size_limit) break;
1744 /* A line that is not syntactically correct for a header also marks
1745 the end of the headers. In this case, we leave next containing the
1746 first data line. This might actually be several lines because of the
1747 continuation logic applied above, but that doesn't matter.
1749 It turns out that smail, and presumably sendmail, accept leading lines
1752 From ph10 Fri Jan 5 12:35 GMT 1996
1754 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1755 find any documentation of this, but for compatibility it had better be
1756 accepted. Exim restricts it to the case of non-smtp messages, and
1757 treats it as an alternative to the -f command line option. Thus it is
1758 ignored except for trusted users or filter testing. Otherwise it is taken
1759 as the sender address, unless -f was used (sendmail compatibility).
1761 It further turns out that some UUCPs generate the From_line in a different
1764 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1766 The regex for matching these things is now capable of recognizing both
1767 formats (including 2- and 4-digit years in the latter). In fact, the regex
1768 is now configurable, as is the expansion string to fish out the sender.
1770 Even further on it has been discovered that some broken clients send
1771 these lines in SMTP messages. There is now an option to ignore them from
1772 specified hosts or networks. Sigh. */
1774 if (header_last == header_list &&
1777 (sender_host_address != NULL &&
1778 verify_check_host(&ignore_fromline_hosts) == OK)
1780 (sender_host_address == NULL && ignore_fromline_local)
1782 regex_match_and_setup(regex_From, next->text, 0, -1))
1784 if (!sender_address_forced)
1786 uschar *uucp_sender = expand_string(uucp_from_sender);
1787 if (uucp_sender == NULL)
1789 log_write(0, LOG_MAIN|LOG_PANIC,
1790 "expansion of \"%s\" failed after matching "
1791 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1795 int start, end, domain;
1797 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1798 &start, &end, &domain, TRUE);
1799 if (newsender != NULL)
1801 if (domain == 0 && newsender[0] != 0)
1802 newsender = rewrite_address_qualify(newsender, FALSE);
1804 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1806 sender_address = newsender;
1808 if (trusted_caller || filter_test != FTEST_NONE)
1810 authenticated_sender = NULL;
1811 originator_name = US"";
1812 sender_local = FALSE;
1815 if (filter_test != FTEST_NONE)
1816 printf("Sender taken from \"From \" line\n");
1823 /* Not a leading "From " line. Check to see if it is a valid header line.
1824 Header names may contain any non-control characters except space and colon,
1829 uschar *p = next->text;
1831 /* If not a valid header line, break from the header reading loop, leaving
1832 next != NULL, indicating that it holds the first line of the body. */
1834 if (isspace(*p)) break;
1835 while (mac_isgraph(*p) && *p != ':') p++;
1836 while (isspace(*p)) p++;
1839 body_zerocount = had_zero;
1843 /* We have a valid header line. If there were any binary zeroes in
1844 the line, stomp on them here. */
1847 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1849 /* It is perfectly legal to have an empty continuation line
1850 at the end of a header, but it is confusing to humans
1851 looking at such messages, since it looks like a blank line.
1852 Reduce confusion by removing redundant white space at the
1853 end. We know that there is at least one printing character
1854 (the ':' tested for above) so there is no danger of running
1857 p = next->text + ptr - 2;
1860 while (*p == ' ' || *p == '\t') p--;
1861 if (*p != '\n') break;
1862 ptr = (p--) - next->text + 1;
1863 message_size -= next->slen - ptr;
1864 next->text[ptr] = 0;
1868 /* Add the header to the chain */
1870 next->type = htype_other;
1872 header_last->next = next;
1875 /* Check the limit for individual line lengths. This comes after adding to
1876 the chain so that the failing line is reflected if a bounce is generated
1877 (for a local message). */
1879 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1881 log_write(0, LOG_MAIN, "overlong message header line received from "
1882 "%s (more than %d characters): message abandoned",
1883 sender_host_unknown? sender_ident : sender_fullhost,
1884 header_line_maxsize);
1888 smtp_reply = US"552 A message header line is too long";
1889 receive_swallow_smtp();
1890 goto TIDYUP; /* Skip to end of function */
1895 give_local_error(ERRMESS_VLONGHDRLINE,
1896 string_sprintf("message header line longer than %d characters "
1897 "received: message not accepted", header_line_maxsize), US"",
1898 error_rc, stdin, header_list->next);
1899 /* Does not return */
1903 /* Note if any resent- fields exist. */
1905 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1907 resents_exist = TRUE;
1908 resent_prefix = US"Resent-";
1912 /* The line has been handled. If we have hit EOF, break out of the loop,
1913 indicating no pending data line. */
1915 if (ch == EOF) { next = NULL; break; }
1917 /* Set up for the next header */
1920 next = store_get(sizeof(header_line));
1921 next->text = store_get(header_size);
1924 prevlines_length = 0;
1925 } /* Continue, starting to read the next header */
1927 /* At this point, we have read all the headers into a data structure in main
1928 store. The first header is still the dummy placeholder for the Received: header
1929 we are going to generate a bit later on. If next != NULL, it contains the first
1930 data line - which terminated the headers before reaching a blank line (not the
1935 debug_printf(">>Headers received:\n");
1936 for (h = header_list->next; h != NULL; h = h->next)
1937 debug_printf("%s", h->text);
1941 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1942 is dropped immediately after valid headers, the next thing we will see is EOF.
1943 We must test for this specially, as further down the reading of the data is
1944 skipped if already at EOF. */
1946 if (smtp_input && (receive_feof)())
1948 smtp_reply = handle_lost_connection(US" (after header)");
1950 goto TIDYUP; /* Skip to end of function */
1953 /* If this is a filter test run and no headers were read, output a warning
1954 in case there is a mistake in the test message. */
1956 if (filter_test != FTEST_NONE && header_list->next == NULL)
1957 printf("Warning: no message headers read\n");
1960 /* Scan the headers to identify them. Some are merely marked for later
1961 processing; some are dealt with here. */
1963 for (h = header_list->next; h != NULL; h = h->next)
1965 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1966 if (is_resent) contains_resent_headers = TRUE;
1968 switch (header_checkname(h, is_resent))
1971 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
1975 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
1978 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1981 if (!resents_exist || is_resent) date_header_exists = TRUE;
1984 /* Same comments as about Return-Path: below. */
1986 case htype_delivery_date:
1987 if (delivery_date_remove) h->type = htype_old;
1990 /* Same comments as about Return-Path: below. */
1992 case htype_envelope_to:
1993 if (envelope_to_remove) h->type = htype_old;
1996 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1997 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1998 header consists of just the login id of the user who called Exim, rewrite
1999 it with the gecos field first. Apply this rule to Resent-From: if there
2000 are resent- fields. */
2003 h->type = htype_from;
2004 if (!resents_exist || is_resent)
2009 uschar *s = Ustrchr(h->text, ':') + 1;
2010 while (isspace(*s)) s++;
2011 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
2013 uschar *name = is_resent? US"Resent-From" : US"From";
2014 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2015 originator_login, qualify_domain_sender);
2016 from_header = header_last;
2017 h->type = htype_old;
2018 DEBUG(D_receive|D_rewrite)
2019 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2025 /* Identify the Message-id: header for generating "in-reply-to" in the
2026 autoreply transport. For incoming logging, save any resent- value. In both
2027 cases, take just the first of any multiples. */
2030 if (msgid_header == NULL && (!resents_exist || is_resent))
2037 /* Flag all Received: headers */
2039 case htype_received:
2040 h->type = htype_received;
2041 /*XXX cutthrough delivery - need to error on excessive number here */
2045 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2047 case htype_reply_to:
2048 h->type = htype_reply_to;
2051 /* The Return-path: header is supposed to be added to messages when
2052 they leave the SMTP system. We shouldn't receive messages that already
2053 contain Return-path. However, since Exim generates Return-path: on
2054 local delivery, resent messages may well contain it. We therefore
2055 provide an option (which defaults on) to remove any Return-path: headers
2056 on input. Removal actually means flagging as "old", which prevents the
2057 header being transmitted with the message. */
2059 case htype_return_path:
2060 if (return_path_remove) h->type = htype_old;
2062 /* If we are testing a mail filter file, use the value of the
2063 Return-Path: header to set up the return_path variable, which is not
2064 otherwise set. However, remove any <> that surround the address
2065 because the variable doesn't have these. */
2067 if (filter_test != FTEST_NONE)
2069 uschar *start = h->text + 12;
2070 uschar *end = start + Ustrlen(start);
2071 while (isspace(*start)) start++;
2072 while (end > start && isspace(end[-1])) end--;
2073 if (*start == '<' && end[-1] == '>')
2078 return_path = string_copyn(start, end - start);
2079 printf("Return-path taken from \"Return-path:\" header line\n");
2083 /* If there is a "Sender:" header and the message is locally originated,
2084 and from an untrusted caller and suppress_local_fixups is not set, or if we
2085 are in submission mode for a remote message, mark it "old" so that it will
2086 not be transmitted with the message, unless active_local_sender_retain is
2087 set. (This can only be true if active_local_from_check is false.) If there
2088 are any resent- headers in the message, apply this rule to Resent-Sender:
2089 instead of Sender:. Messages with multiple resent- header sets cannot be
2090 tidily handled. (For this reason, at least one MUA - Pine - turns old
2091 resent- headers into X-resent- headers when resending, leaving just one
2095 h->type = ((!active_local_sender_retain &&
2097 (sender_local && !trusted_caller && !suppress_local_fixups)
2101 (!resents_exist||is_resent))?
2102 htype_old : htype_sender;
2105 /* Remember the Subject: header for logging. There is no Resent-Subject */
2111 /* "To:" gets flagged, and the existence of a recipient header is noted,
2112 whether it's resent- or not. */
2117 to_or_cc_header_exists = TRUE;
2123 /* Extract recipients from the headers if that is required (the -t option).
2124 Note that this is documented as being done *before* any address rewriting takes
2125 place. There are two possibilities:
2127 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2128 recipients already listed are to be REMOVED from the message. Smail 3 works
2129 like this. We need to build a non-recipients tree for that list, because in
2130 subsequent processing this data is held in a tree and that's what the
2131 spool_write_header() function expects. Make sure that non-recipient addresses
2132 are fully qualified and rewritten if necessary.
2134 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2135 those in the command line arguments (and it is rumoured some other MTAs do
2136 this). Therefore, there is an option to make Exim behave this way.
2138 *** Notes on "Resent-" header lines ***
2140 The presence of resent-headers in the message makes -t horribly ambiguous.
2141 Experiments with sendmail showed that it uses recipients for all resent-
2142 headers, totally ignoring the concept of "sets of resent- headers" as described
2143 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2144 with all the addresses in one instance of each header.
2146 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2147 error for -t if there were resent- headers in the message. However, after a
2148 discussion on the mailing list, I've learned that there are MUAs that use
2149 resent- headers with -t, and also that the stuff about sets of resent- headers
2150 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2151 message with -t and resent- header lines makes sure that only *its* resent-
2152 headers are present; previous ones are often renamed as X-resent- for example.
2154 Consequently, Exim has been changed so that, if any resent- header lines are
2155 present, the recipients are taken from all of the appropriate resent- lines,
2156 and not from the ordinary To:, Cc:, etc. */
2161 error_block **bnext = &bad_addresses;
2163 if (extract_addresses_remove_arguments)
2165 while (recipients_count-- > 0)
2167 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2168 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2169 tree_add_nonrecipient(s);
2171 recipients_list = NULL;
2172 recipients_count = recipients_list_max = 0;
2175 /* Now scan the headers */
2177 for (h = header_list->next; h != NULL; h = h->next)
2179 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2180 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2182 uschar *s = Ustrchr(h->text, ':') + 1;
2183 while (isspace(*s)) s++;
2185 parse_allow_group = TRUE; /* Allow address group syntax */
2189 uschar *ss = parse_find_address_end(s, FALSE);
2190 uschar *recipient, *errmess, *p, *pp;
2191 int start, end, domain;
2193 /* Check on maximum */
2195 if (recipients_max > 0 && ++rcount > recipients_max)
2197 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2198 US"message rejected: ", error_rc, stdin, NULL);
2199 /* Does not return */
2202 /* Make a copy of the address, and remove any internal newlines. These
2203 may be present as a result of continuations of the header line. The
2204 white space that follows the newline must not be removed - it is part
2207 pp = recipient = store_get(ss - s + 1);
2208 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2210 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2213 /* Keep a list of all the bad addresses so we can send a single
2214 error message at the end. However, an empty address is not an error;
2215 just ignore it. This can come from an empty group list like
2217 To: Recipients of list:;
2219 If there are no recipients at all, an error will occur later. */
2221 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2223 int len = Ustrlen(s);
2224 error_block *b = store_get(sizeof(error_block));
2225 while (len > 0 && isspace(s[len-1])) len--;
2227 b->text1 = string_printing(string_copyn(s, len));
2233 /* If the recipient is already in the nonrecipients tree, it must
2234 have appeared on the command line with the option extract_addresses_
2235 remove_arguments set. Do not add it to the recipients, and keep a note
2236 that this has happened, in order to give a better error if there are
2237 no recipients left. */
2239 else if (recipient != NULL)
2241 if (tree_search(tree_nonrecipients, recipient) == NULL)
2242 receive_add_recipient(recipient, -1);
2244 extracted_ignored = TRUE;
2247 /* Move on past this address */
2249 s = ss + (*ss? 1:0);
2250 while (isspace(*s)) s++;
2251 } /* Next address */
2253 parse_allow_group = FALSE; /* Reset group syntax flags */
2254 parse_found_group = FALSE;
2256 /* If this was the bcc: header, mark it "old", which means it
2257 will be kept on the spool, but not transmitted as part of the
2260 if (h->type == htype_bcc) h->type = htype_old;
2261 } /* For appropriate header line */
2262 } /* For each header line */
2266 /* Now build the unique message id. This has changed several times over the
2267 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2268 Retaining all the history in the comment has become too unwieldy - read
2269 previous release sources if you want it.
2271 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2272 The first part is the current time, in seconds. The second part is the current
2273 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2274 can hold a number in the range 0-3843. It used to be a computed sequence
2275 number, but is now the fractional component of the current time in units of
2276 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2277 received, Exim ensures that the timer has ticked at the appropriate level
2278 before proceeding, to avoid duplication if the pid happened to be re-used
2279 within the same time period. It seems likely that most messages will take at
2280 least half a millisecond to be received, so no delay will normally be
2281 necessary. At least for some time...
2283 There is a modification when localhost_number is set. Formerly this was allowed
2284 to be as large as 255. Now it is restricted to the range 0-16, and the final
2285 component of the message id becomes (localhost_number * 200) + fractional time
2286 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2288 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2289 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2290 still allows the tttttt field to hold a large enough number to last for some
2291 more decades, and the final two-digit field can hold numbers up to 1295, which
2292 is enough for milliseconds (instead of 1/2000 of a second).
2294 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2295 pid, so it is probably safe because pids have to be positive. The
2296 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2297 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2299 Note that string_base62() returns its data in a static storage block, so it
2300 must be copied before calling string_base62() again. It always returns exactly
2303 There doesn't seem to be anything in the RFC which requires a message id to
2304 start with a letter, but Smail was changed to ensure this. The external form of
2305 the message id (as supplied by string expansion) therefore starts with an
2306 additional leading 'E'. The spool file names do not include this leading
2307 letter and it is not used internally.
2309 NOTE: If ever the format of message ids is changed, the regular expression for
2310 checking that a string is in this format must be updated in a corresponding
2311 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2312 must also be changed to reflect the correct string length. Then, of course,
2313 other programs that rely on the message id format will need updating too. */
2315 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2316 message_id[6] = '-';
2317 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2319 /* Deal with the case where the host number is set. The value of the number was
2320 checked when it was read, to ensure it isn't too big. The timing granularity is
2321 left in id_resolution so that an appropriate wait can be done after receiving
2322 the message, if necessary (we hope it won't be). */
2324 if (host_number_string != NULL)
2326 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2327 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2328 string_base62((long int)(
2329 host_number * (1000000/id_resolution) +
2330 message_id_tv.tv_usec/id_resolution)) + 4);
2333 /* Host number not set: final field is just the fractional time at an
2334 appropriate resolution. */
2338 id_resolution = (BASE_62 == 62)? 500 : 1000;
2339 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2340 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2343 /* Add the current message id onto the current process info string if
2346 (void)string_format(process_info + process_info_len,
2347 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2349 /* If we are using multiple input directories, set up the one for this message
2350 to be the least significant base-62 digit of the time of arrival. Otherwise
2351 ensure that it is an empty string. */
2353 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2355 /* Now that we have the message-id, if there is no message-id: header, generate
2356 one, but only for local (without suppress_local_fixups) or submission mode
2357 messages. This can be user-configured if required, but we had better flatten
2358 any illegal characters therein. */
2360 if (msgid_header == NULL &&
2361 ((sender_host_address == NULL && !suppress_local_fixups)
2362 || submission_mode))
2365 uschar *id_text = US"";
2366 uschar *id_domain = primary_hostname;
2368 /* Permit only letters, digits, dots, and hyphens in the domain */
2370 if (message_id_domain != NULL)
2372 uschar *new_id_domain = expand_string(message_id_domain);
2373 if (new_id_domain == NULL)
2375 if (!expand_string_forcedfail)
2376 log_write(0, LOG_MAIN|LOG_PANIC,
2377 "expansion of \"%s\" (message_id_header_domain) "
2378 "failed: %s", message_id_domain, expand_string_message);
2380 else if (*new_id_domain != 0)
2382 id_domain = new_id_domain;
2383 for (p = id_domain; *p != 0; p++)
2384 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2388 /* Permit all characters except controls and RFC 2822 specials in the
2389 additional text part. */
2391 if (message_id_text != NULL)
2393 uschar *new_id_text = expand_string(message_id_text);
2394 if (new_id_text == NULL)
2396 if (!expand_string_forcedfail)
2397 log_write(0, LOG_MAIN|LOG_PANIC,
2398 "expansion of \"%s\" (message_id_header_text) "
2399 "failed: %s", message_id_text, expand_string_message);
2401 else if (*new_id_text != 0)
2403 id_text = new_id_text;
2404 for (p = id_text; *p != 0; p++)
2405 if (mac_iscntrl_or_special(*p)) *p = '-';
2409 /* Add the header line
2410 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2411 * appended, to preserve classical expectations of header ordering. */
2413 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2414 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2415 (*id_text == 0)? "" : ".", id_text, id_domain);
2418 /* If we are to log recipients, keep a copy of the raw ones before any possible
2419 rewriting. Must copy the count, because later ACLs and the local_scan()
2420 function may mess with the real recipients. */
2422 if ((log_extra_selector & LX_received_recipients) != 0)
2424 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2425 for (i = 0; i < recipients_count; i++)
2426 raw_recipients[i] = string_copy(recipients_list[i].address);
2427 raw_recipients_count = recipients_count;
2430 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2431 recipients will get here only if the conditions were right (allow_unqualified_
2432 recipient is TRUE). */
2434 for (i = 0; i < recipients_count; i++)
2435 recipients_list[i].address =
2436 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2437 global_rewrite_rules, rewrite_existflags);
2439 /* If there is no From: header, generate one for local (without
2440 suppress_local_fixups) or submission_mode messages. If there is no sender
2441 address, but the sender is local or this is a local delivery error, use the
2442 originator login. This shouldn't happen for genuine bounces, but might happen
2443 for autoreplies. The addition of From: must be done *before* checking for the
2444 possible addition of a Sender: header, because untrusted_set_sender allows an
2445 untrusted user to set anything in the envelope (which might then get info
2446 From:) but we still want to ensure a valid Sender: if it is required. */
2448 if (from_header == NULL &&
2449 ((sender_host_address == NULL && !suppress_local_fixups)
2450 || submission_mode))
2452 uschar *oname = US"";
2454 /* Use the originator_name if this is a locally submitted message and the
2455 caller is not trusted. For trusted callers, use it only if -F was used to
2456 force its value or if we have a non-SMTP message for which -f was not used
2457 to set the sender. */
2459 if (sender_host_address == NULL)
2461 if (!trusted_caller || sender_name_forced ||
2462 (!smtp_input && !sender_address_forced))
2463 oname = originator_name;
2466 /* For non-locally submitted messages, the only time we use the originator
2467 name is when it was forced by the /name= option on control=submission. */
2471 if (submission_name != NULL) oname = submission_name;
2474 /* Envelope sender is empty */
2476 if (sender_address[0] == 0)
2478 uschar *fromstart, *fromend;
2480 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2481 oname, (oname[0] == 0)? "" : " <");
2482 fromend = (oname[0] == 0)? US"" : US">";
2484 if (sender_local || local_error_message)
2486 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2487 local_part_quote(originator_login), qualify_domain_sender,
2490 else if (submission_mode && authenticated_id != NULL)
2492 if (submission_domain == NULL)
2494 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2495 local_part_quote(authenticated_id), qualify_domain_sender,
2498 else if (submission_domain[0] == 0) /* empty => whole address set */
2500 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2505 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2506 local_part_quote(authenticated_id), submission_domain,
2509 from_header = header_last; /* To get it checked for Sender: */
2513 /* There is a non-null envelope sender. Build the header using the original
2514 sender address, before any rewriting that might have been done while
2519 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2521 (oname[0] == 0)? "" : " <",
2522 (sender_address_unrewritten == NULL)?
2523 sender_address : sender_address_unrewritten,
2524 (oname[0] == 0)? "" : ">");
2526 from_header = header_last; /* To get it checked for Sender: */
2531 /* If the sender is local (without suppress_local_fixups), or if we are in
2532 submission mode and there is an authenticated_id, check that an existing From:
2533 is correct, and if not, generate a Sender: header, unless disabled. Any
2534 previously-existing Sender: header was removed above. Note that sender_local,
2535 as well as being TRUE if the caller of exim is not trusted, is also true if a
2536 trusted caller did not supply a -f argument for non-smtp input. To allow
2537 trusted callers to forge From: without supplying -f, we have to test explicitly
2538 here. If the From: header contains more than one address, then the call to
2539 parse_extract_address fails, and a Sender: header is inserted, as required. */
2541 if (from_header != NULL &&
2542 (active_local_from_check &&
2543 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2544 (submission_mode && authenticated_id != NULL))
2547 BOOL make_sender = TRUE;
2548 int start, end, domain;
2550 uschar *from_address =
2551 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2552 &start, &end, &domain, FALSE);
2553 uschar *generated_sender_address;
2555 if (submission_mode)
2557 if (submission_domain == NULL)
2559 generated_sender_address = string_sprintf("%s@%s",
2560 local_part_quote(authenticated_id), qualify_domain_sender);
2562 else if (submission_domain[0] == 0) /* empty => full address */
2564 generated_sender_address = string_sprintf("%s",
2569 generated_sender_address = string_sprintf("%s@%s",
2570 local_part_quote(authenticated_id), submission_domain);
2574 generated_sender_address = string_sprintf("%s@%s",
2575 local_part_quote(originator_login), qualify_domain_sender);
2577 /* Remove permitted prefixes and suffixes from the local part of the From:
2578 address before doing the comparison with the generated sender. */
2580 if (from_address != NULL)
2583 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2585 if (at != NULL) *at = 0;
2586 from_address += route_check_prefix(from_address, local_from_prefix);
2587 slen = route_check_suffix(from_address, local_from_suffix);
2590 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2591 from_address += slen;
2593 if (at != NULL) *at = '@';
2595 if (strcmpic(generated_sender_address, from_address) == 0 ||
2596 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2597 make_sender = FALSE;
2600 /* We have to cause the Sender header to be rewritten if there are
2601 appropriate rewriting rules. */
2605 if (submission_mode && submission_name == NULL)
2606 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2607 generated_sender_address);
2609 header_add(htype_sender, "%sSender: %s <%s>\n",
2611 submission_mode? submission_name : originator_name,
2612 generated_sender_address);
2615 /* Ensure that a non-null envelope sender address corresponds to the
2616 submission mode sender address. */
2618 if (submission_mode && sender_address[0] != 0)
2620 if (sender_address_unrewritten == NULL)
2621 sender_address_unrewritten = sender_address;
2622 sender_address = generated_sender_address;
2623 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2624 log_write(L_address_rewrite, LOG_MAIN,
2625 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2626 sender_address_unrewritten, generated_sender_address);
2631 /* If there are any rewriting rules, apply them to the sender address, unless
2632 it has already been rewritten as part of verification for SMTP input. */
2634 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2635 sender_address[0] != 0)
2637 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2638 global_rewrite_rules, rewrite_existflags);
2639 DEBUG(D_receive|D_rewrite)
2640 debug_printf("rewritten sender = %s\n", sender_address);
2644 /* The headers must be run through rewrite_header(), because it ensures that
2645 addresses are fully qualified, as well as applying any rewriting rules that may
2648 Qualification of header addresses in a message from a remote host happens only
2649 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2650 appropriate. For local messages, qualification always happens, unless -bnq is
2651 used to explicitly suppress it. No rewriting is done for an unqualified address
2652 that is left untouched.
2654 We start at the second header, skipping our own Received:. This rewriting is
2655 documented as happening *after* recipient addresses are taken from the headers
2656 by the -t command line option. An added Sender: gets rewritten here. */
2658 for (h = header_list->next; h != NULL; h = h->next)
2660 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2661 rewrite_existflags, TRUE);
2662 if (newh != NULL) h = newh;
2666 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2667 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2668 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2669 exists, this applies to the set of resent- headers rather than the normal set.
2671 The requirement for a recipient header has been removed in RFC 2822. At this
2672 point in the code, earlier versions of Exim added a To: header for locally
2673 submitted messages, and an empty Bcc: header for others. In the light of the
2674 changes in RFC 2822, this was dropped in November 2003. */
2677 /* If there is no date header, generate one if the message originates locally
2678 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2679 submission mode flag is set. Messages without Date: are not valid, but it seems
2680 to be more confusing if Exim adds one to all remotely-originated messages.
2681 As per Message-Id, we prepend if resending, else append.
2684 if (!date_header_exists &&
2685 ((sender_host_address == NULL && !suppress_local_fixups)
2686 || submission_mode))
2687 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2688 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2690 search_tidyup(); /* Free any cached resources */
2692 /* Show the complete set of headers if debugging. Note that the first one (the
2693 new Received:) has not yet been set. */
2697 debug_printf(">>Headers after rewriting and local additions:\n");
2698 for (h = header_list->next; h != NULL; h = h->next)
2699 debug_printf("%c %s", h->type, h->text);
2703 /* The headers are now complete in store. If we are running in filter
2704 testing mode, that is all this function does. Return TRUE if the message
2705 ended with a dot. */
2707 if (filter_test != FTEST_NONE)
2709 process_info[process_info_len] = 0;
2710 return message_ended == END_DOT;
2713 /*XXX cutthrough deliver:
2714 We have to create the Received header now rather than at the end of reception,
2715 so the timestamp behaviour is a change to the normal case.
2716 XXX Ensure this gets documented XXX.
2718 if (cutthrough_fd >= 0)
2720 received_header_gen();
2721 add_acl_headers(US"MAIL or RCPT");
2722 (void) cutthrough_headers_send();
2726 /*XXX cutthrough deliver:
2727 Here's where we open the data spoolfile. Want to optionally avoid.
2730 /* Open a new spool file for the data portion of the message. We need
2731 to access it both via a file descriptor and a stream. Try to make the
2732 directory if it isn't there. Note re use of sprintf: spool_directory
2733 is checked on input to be < 200 characters long. */
2735 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2737 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2740 if (errno == ENOENT)
2743 sprintf(CS temp, "input/%s", message_subdir);
2744 if (message_subdir[0] == 0) temp[5] = 0;
2745 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2746 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2749 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2750 spool_name, strerror(errno));
2753 /* Make sure the file's group is the Exim gid, and double-check the mode
2754 because the group setting doesn't always get set automatically. */
2756 (void)fchown(data_fd, exim_uid, exim_gid);
2757 (void)fchmod(data_fd, SPOOL_MODE);
2759 /* We now have data file open. Build a stream for it and lock it. We lock only
2760 the first line of the file (containing the message ID) because otherwise there
2761 are problems when Exim is run under Cygwin (I'm told). See comments in
2762 spool_in.c, where the same locking is done. */
2764 data_file = fdopen(data_fd, "w+");
2765 lock_data.l_type = F_WRLCK;
2766 lock_data.l_whence = SEEK_SET;
2767 lock_data.l_start = 0;
2768 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2770 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2771 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2772 errno, strerror(errno));
2774 /* We have an open, locked data file. Write the message id to it to make it
2775 self-identifying. Then read the remainder of the input of this message and
2776 write it to the data file. If the variable next != NULL, it contains the first
2777 data line (which was read as a header but then turned out not to have the right
2778 format); write it (remembering that it might contain binary zeros). The result
2779 of fwrite() isn't inspected; instead we call ferror() below. */
2781 fprintf(data_file, "%s-D\n", message_id);
2784 uschar *s = next->text;
2785 int len = next->slen;
2786 /*XXX cutthrough - writing the data spool file here. Want to optionally avoid. */
2787 (void)fwrite(s, 1, len, data_file);
2788 body_linecount++; /* Assumes only 1 line */
2791 /* Note that we might already be at end of file, or the logical end of file
2792 (indicated by '.'), or might have encountered an error while writing the
2793 message id or "next" line. */
2795 /* XXX cutthrough - no-spool option....... */
2796 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2800 /*XXX cutthrough - writing the data spool file here. Want to optionally avoid. */
2801 /* Would suffice to leave data_file arg NULL */
2802 message_ended = read_message_data_smtp(data_file);
2803 receive_linecount++; /* The terminating "." line */
2805 else message_ended = read_message_data(data_file);
2807 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2808 message_linecount += body_linecount;
2810 /* Handle premature termination of SMTP */
2812 if (smtp_input && message_ended == END_EOF)
2814 Uunlink(spool_name); /* Lose data file when closed */
2815 cancel_cutthrough_connection();
2816 message_id[0] = 0; /* Indicate no message accepted */
2817 smtp_reply = handle_lost_connection(US"");
2819 goto TIDYUP; /* Skip to end of function */
2822 /* Handle message that is too big. Don't use host_or_ident() in the log
2823 message; we want to see the ident value even for non-remote messages. */
2825 if (message_ended == END_SIZE)
2827 Uunlink(spool_name); /* Lose the data file when closed */
2828 cancel_cutthrough_connection();
2829 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2831 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2832 "message too big: read=%d max=%d",
2834 (sender_fullhost == NULL)? "" : " H=",
2835 (sender_fullhost == NULL)? US"" : sender_fullhost,
2836 (sender_ident == NULL)? "" : " U=",
2837 (sender_ident == NULL)? US"" : sender_ident,
2839 thismessage_size_limit);
2843 smtp_reply = US"552 Message size exceeds maximum permitted";
2844 message_id[0] = 0; /* Indicate no message accepted */
2845 goto TIDYUP; /* Skip to end of function */
2849 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2850 give_local_error(ERRMESS_TOOBIG,
2851 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2852 US"message rejected: ", error_rc, data_file, header_list);
2853 /* Does not return */
2858 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2859 example, there may be some expansion in an ACL that uses a timer.) */
2861 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2863 /* The message body has now been read into the data file. Call fflush() to
2864 empty the buffers in C, and then call fsync() to get the data written out onto
2865 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2866 having to do this). If there was an I/O error on either input or output,
2867 attempt to send an error message, and unlink the spool file. For non-SMTP input
2868 we can then give up. Note that for SMTP input we must swallow the remainder of
2869 the input in cases of output errors, since the far end doesn't expect to see
2870 anything until the terminating dot line is sent. */
2872 /* XXX cutthrough - no-spool option....... */
2873 if (fflush(data_file) == EOF || ferror(data_file) ||
2874 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2876 uschar *msg_errno = US strerror(errno);
2877 BOOL input_error = (receive_ferror)() != 0;
2878 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2879 input_error? "Input read" : "Spool write",
2881 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2883 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2884 Uunlink(spool_name); /* Lose the data file */
2885 cancel_cutthrough_connection();
2890 smtp_reply = US"451 Error while reading input data";
2893 smtp_reply = US"451 Error while writing spool file";
2894 receive_swallow_smtp();
2896 message_id[0] = 0; /* Indicate no message accepted */
2897 goto TIDYUP; /* Skip to end of function */
2902 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2903 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2905 /* Does not return */
2910 /* No I/O errors were encountered while writing the data file. */
2912 /*XXX cutthrough - avoid message if no-spool option */
2913 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2916 /* If there were any bad addresses extracted by -t, or there were no recipients
2917 left after -t, send a message to the sender of this message, or write it to
2918 stderr if the error handling option is set that way. Note that there may
2919 legitimately be no recipients for an SMTP message if they have all been removed
2922 We need to rewind the data file in order to read it. In the case of no
2923 recipients or stderr error writing, throw the data file away afterwards, and
2924 exit. (This can't be SMTP, which always ensures there's at least one
2925 syntactically good recipient address.) */
2927 /*XXX cutthrough - can't if no-spool option. extract_recip is a fn arg.
2928 Make incompat with no-spool at fn start. */
2930 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2934 if (recipients_count == 0) debug_printf("*** No recipients\n");
2935 if (bad_addresses != NULL)
2937 error_block *eblock = bad_addresses;
2938 debug_printf("*** Bad address(es)\n");
2939 while (eblock != NULL)
2941 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2942 eblock = eblock->next;
2947 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2949 /* If configured to send errors to the sender, but this fails, force
2950 a failure error code. We use a special one for no recipients so that it
2951 can be detected by the autoreply transport. Otherwise error_rc is set to
2952 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2953 it is EXIT_SUCCESS. */
2955 if (error_handling == ERRORS_SENDER)
2957 if (!moan_to_sender(
2958 (bad_addresses == NULL)?
2959 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2960 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2961 bad_addresses, header_list, data_file, FALSE))
2962 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2966 if (bad_addresses == NULL)
2968 if (extracted_ignored)
2969 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2971 fprintf(stderr, "exim: no recipients in message\n");
2975 fprintf(stderr, "exim: invalid address%s",
2976 (bad_addresses->next == NULL)? ":" : "es:\n");
2977 while (bad_addresses != NULL)
2979 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2980 bad_addresses->text2);
2981 bad_addresses = bad_addresses->next;
2986 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2988 Uunlink(spool_name);
2989 (void)fclose(data_file);
2990 exim_exit(error_rc);
2994 /* Data file successfully written. Generate text for the Received: header by
2995 expanding the configured string, and adding a timestamp. By leaving this
2996 operation till now, we ensure that the timestamp is the time that message
2997 reception was completed. However, this is deliberately done before calling the
2998 data ACL and local_scan().
3000 This Received: header may therefore be inspected by the data ACL and by code in
3001 the local_scan() function. When they have run, we update the timestamp to be
3002 the final time of reception.
3004 If there is just one recipient, set up its value in the $received_for variable
3005 for use when we generate the Received: header.
3007 Note: the checking for too many Received: headers is handled by the delivery
3009 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3011 if (received_header->text == NULL) /* Non-cutthrough case */
3013 received_header_gen();
3015 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3017 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3018 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3020 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3021 now, before running the DATA ACL. */
3023 add_acl_headers(US"MAIL or RCPT");
3025 else if (data_fd >= 0)
3026 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3027 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3029 /*XXX cutthrough - XXX how to get the body size? */
3030 /* perhaps a header-size to subtract from message_size? */
3031 message_body_size = message_size - 1;
3033 /* If an ACL is specified for checking things at this stage of reception of a
3034 message, run it, unless all the recipients were removed by "discard" in earlier
3035 ACLs. That is the only case in which recipients_count can be zero at this
3036 stage. Set deliver_datafile to point to the data file so that $message_body and
3037 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3040 deliver_datafile = data_fd;
3043 enable_dollar_recipients = TRUE;
3045 if (recipients_count == 0)
3047 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3051 /* Handle interactive SMTP messages */
3053 if (smtp_input && !smtp_batched_input)
3056 #ifndef DISABLE_DKIM
3057 if (!dkim_disable_verify)
3059 /* XXX cutthrough - no-spool option....... */
3060 /* Finish verification, this will log individual signature results to
3062 dkim_exim_verify_finish();
3064 /* Check if we must run the DKIM ACL */
3065 if ((acl_smtp_dkim != NULL) &&
3066 (dkim_verify_signers != NULL) &&
3067 (dkim_verify_signers[0] != '\0'))
3069 uschar *dkim_verify_signers_expanded =
3070 expand_string(dkim_verify_signers);
3071 if (dkim_verify_signers_expanded == NULL)
3073 log_write(0, LOG_MAIN|LOG_PANIC,
3074 "expansion of dkim_verify_signers option failed: %s",
3075 expand_string_message);
3080 uschar *ptr = dkim_verify_signers_expanded;
3081 uschar *item = NULL;
3082 uschar *seen_items = NULL;
3083 int seen_items_size = 0;
3084 int seen_items_offset = 0;
3085 uschar itembuf[256];
3086 /* Default to OK when no items are present */
3088 while ((item = string_nextinlist(&ptr, &sep,
3090 sizeof(itembuf))) != NULL)
3092 /* Prevent running ACL for an empty item */
3093 if (!item || (item[0] == '\0')) continue;
3094 /* Only run ACL once for each domain or identity, no matter how often it
3095 appears in the expanded list. */
3096 if (seen_items != NULL)
3098 uschar *seen_item = NULL;
3099 uschar seen_item_buf[256];
3100 uschar *seen_items_list = seen_items;
3101 int seen_this_item = 0;
3103 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3105 sizeof(seen_item_buf))) != NULL)
3107 if (Ustrcmp(seen_item,item) == 0)
3114 if (seen_this_item > 0)
3117 debug_printf("acl_smtp_dkim: skipping signer %s, already seen\n", item);
3121 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,":");
3124 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,item);
3125 seen_items[seen_items_offset] = '\0';
3128 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n", item);
3130 dkim_exim_acl_setup(item);
3131 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, &user_msg, &log_msg);
3136 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, skipping remaining items\n", rc, item);
3137 cancel_cutthrough_connection();
3141 add_acl_headers(US"DKIM");
3144 recipients_count = 0;
3145 blackholed_by = US"DKIM ACL";
3146 if (log_msg != NULL)
3147 blackhole_log_msg = string_sprintf(": %s", log_msg);
3151 Uunlink(spool_name);
3152 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3153 smtp_yield = FALSE; /* No more messsages after dropped connection */
3154 smtp_reply = US""; /* Indicate reply already sent */
3155 message_id[0] = 0; /* Indicate no message accepted */
3156 goto TIDYUP; /* Skip to end of function */
3161 #endif /* DISABLE_DKIM */
3163 #ifdef WITH_CONTENT_SCAN
3164 /* XXX cutthrough - no-spool option....... */
3165 if (recipients_count > 0 &&
3166 acl_smtp_mime != NULL &&
3167 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3169 #endif /* WITH_CONTENT_SCAN */
3171 /* Check the recipients count again, as the MIME ACL might have changed
3174 /* XXX cutthrough - no-spool option must document that data-acl has no file access */
3175 /* but can peek at headers */
3177 if (acl_smtp_data != NULL && recipients_count > 0)
3179 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3180 add_acl_headers(US"DATA");
3183 recipients_count = 0;
3184 blackholed_by = US"DATA ACL";
3185 if (log_msg != NULL)
3186 blackhole_log_msg = string_sprintf(": %s", log_msg);
3187 cancel_cutthrough_connection();
3191 Uunlink(spool_name);
3192 cancel_cutthrough_connection();
3193 #ifdef WITH_CONTENT_SCAN
3196 #ifdef EXPERIMENTAL_DCC
3199 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3200 smtp_yield = FALSE; /* No more messsages after dropped connection */
3201 smtp_reply = US""; /* Indicate reply already sent */
3202 message_id[0] = 0; /* Indicate no message accepted */
3203 goto TIDYUP; /* Skip to end of function */
3208 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3209 we cannot take different actions for permanent and temporary rejections. */
3214 #ifdef WITH_CONTENT_SCAN
3215 if (acl_not_smtp_mime != NULL &&
3216 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3219 #endif /* WITH_CONTENT_SCAN */
3221 if (acl_not_smtp != NULL)
3223 uschar *user_msg, *log_msg;
3224 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3227 recipients_count = 0;
3228 blackholed_by = US"non-SMTP ACL";
3229 if (log_msg != NULL)
3230 blackhole_log_msg = string_sprintf(": %s", log_msg);
3234 Uunlink(spool_name);
3235 #ifdef WITH_CONTENT_SCAN
3238 #ifdef EXPERIMENTAL_DCC
3241 /* The ACL can specify where rejections are to be logged, possibly
3242 nowhere. The default is main and reject logs. */
3244 if (log_reject_target != 0)
3245 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3246 sender_address, log_msg);
3248 if (user_msg == NULL) user_msg = US"local configuration problem";
3249 if (smtp_batched_input)
3251 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3252 /* Does not return */
3256 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3257 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3258 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3260 /* Does not return */
3263 add_acl_headers(US"non-SMTP");
3267 /* The applicable ACLs have been run */
3269 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3270 if (queue_only_policy) queued_by = US"ACL";
3273 #ifdef WITH_CONTENT_SCAN
3277 #ifdef EXPERIMENTAL_DCC
3282 /* The final check on the message is to run the scan_local() function. The
3283 version supplied with Exim always accepts, but this is a hook for sysadmins to
3284 supply their own checking code. The local_scan() function is run even when all
3285 the recipients have been discarded. */
3287 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3289 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3290 deleted, and the incident gets logged. */
3292 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3293 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3294 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3295 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3297 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3298 local_scan_timeout);
3299 local_scan_data = NULL;
3301 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3302 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3303 /* XXX cutthrough - no-spool option..... */
3304 rc = local_scan(data_fd, &local_scan_data);
3306 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3308 enable_dollar_recipients = FALSE;
3310 store_pool = POOL_MAIN; /* In case changed */
3311 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3314 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3315 os_non_restarting_signal(SIGFPE, SIG_DFL);
3316 os_non_restarting_signal(SIGILL, SIG_DFL);
3317 os_non_restarting_signal(SIGBUS, SIG_DFL);
3319 /* The length check is paranoia against some runaway code, and also because
3320 (for a success return) lines in the spool file are read into big_buffer. */
3322 if (local_scan_data != NULL)
3324 int len = Ustrlen(local_scan_data);
3325 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3326 local_scan_data = string_copyn(local_scan_data, len);
3329 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3331 if (!deliver_freeze) /* ACL might have already frozen */
3333 deliver_freeze = TRUE;
3334 deliver_frozen_at = time(NULL);
3335 frozen_by = US"local_scan()";
3337 rc = LOCAL_SCAN_ACCEPT;
3339 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3341 if (!queue_only_policy) /* ACL might have already queued */
3343 queue_only_policy = TRUE;
3344 queued_by = US"local_scan()";
3346 rc = LOCAL_SCAN_ACCEPT;
3349 /* Message accepted: remove newlines in local_scan_data because otherwise
3350 the spool file gets corrupted. Ensure that all recipients are qualified. */
3352 if (rc == LOCAL_SCAN_ACCEPT)
3354 if (local_scan_data != NULL)
3357 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3359 for (i = 0; i < recipients_count; i++)
3361 recipient_item *r = recipients_list + i;
3362 r->address = rewrite_address_qualify(r->address, TRUE);
3363 if (r->errors_to != NULL)
3364 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3366 if (recipients_count == 0 && blackholed_by == NULL)
3367 blackholed_by = US"local_scan";
3370 /* Message rejected: newlines permitted in local_scan_data to generate
3371 multiline SMTP responses. */
3375 uschar *istemp = US"";
3381 errmsg = local_scan_data;
3383 Uunlink(spool_name); /* Cancel this message */
3387 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3388 "rejection given", rc);
3391 case LOCAL_SCAN_REJECT_NOLOGHDR:
3392 log_extra_selector &= ~LX_rejected_header;
3395 case LOCAL_SCAN_REJECT:
3396 smtp_code = US"550";
3397 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3400 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3401 log_extra_selector &= ~LX_rejected_header;
3404 case LOCAL_SCAN_TEMPREJECT:
3406 smtp_code = US"451";
3407 if (errmsg == NULL) errmsg = US"Temporary local problem";
3408 istemp = US"temporarily ";
3412 s = string_append(s, &size, &sptr, 2, US"F=",
3413 (sender_address[0] == 0)? US"<>" : sender_address);
3414 s = add_host_info_for_log(s, &size, &sptr);
3417 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3418 s, istemp, string_printing(errmsg));
3422 if (!smtp_batched_input)
3424 smtp_respond(smtp_code, 3, TRUE, errmsg);
3425 message_id[0] = 0; /* Indicate no message accepted */
3426 smtp_reply = US""; /* Indicate reply already sent */
3427 goto TIDYUP; /* Skip to end of function */
3431 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3432 /* Does not return */
3437 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3438 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3439 US"message rejected by local scan code: ", error_rc, data_file,
3441 /* Does not return */
3445 /* Reset signal handlers to ignore signals that previously would have caused
3446 the message to be abandoned. */
3448 signal(SIGTERM, SIG_IGN);
3449 signal(SIGINT, SIG_IGN);
3452 /* Ensure the first time flag is set in the newly-received message. */
3454 deliver_firsttime = TRUE;
3456 #ifdef EXPERIMENTAL_BRIGHTMAIL
3458 /* rewind data file */
3459 /* XXX cutthrough - no-spool option..... */
3460 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3461 bmi_verdicts = bmi_process_message(header_list, data_fd);
3465 /* Update the timstamp in our Received: header to account for any time taken by
3466 an ACL or by local_scan(). The new time is the time that all reception
3467 processing is complete. */
3469 timestamp = expand_string(US"${tod_full}");
3470 tslen = Ustrlen(timestamp);
3472 memcpy(received_header->text + received_header->slen - tslen - 1,
3475 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3479 deliver_freeze = FALSE;
3480 queue_only_policy = FALSE;
3483 /* Keep the data file open until we have written the header file, in order to
3484 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3485 don't write the header file, and we unlink the data file. If writing the header
3486 file fails, we have failed to accept this message. */
3488 if (host_checking || blackholed_by != NULL)
3491 Uunlink(spool_name);
3492 msg_size = 0; /* Compute size for log line */
3493 for (h = header_list; h != NULL; h = h->next)
3494 if (h->type != '*') msg_size += h->slen;
3497 /* Write the -H file */
3502 Optionally want to avoid writing spool files (when no data-time filtering needed) */
3504 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3506 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3507 Uunlink(spool_name); /* Lose the data file */
3511 smtp_reply = US"451 Error in writing spool file";
3512 message_id[0] = 0; /* Indicate no message accepted */
3517 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3518 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3520 /* Does not return */
3526 /* The message has now been successfully received. */
3528 receive_messagecount++;
3530 /* In SMTP sessions we may receive several in one connection. After each one,
3531 we wait for the clock to tick at the level of message-id granularity. This is
3532 so that the combination of time+pid is unique, even on systems where the pid
3533 can be re-used within our time interval. We can't shorten the interval without
3534 re-designing the message-id. See comments above where the message id is
3535 created. This is Something For The Future. */
3537 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3538 exim_wait_tick(&message_id_tv, id_resolution);
3540 /* Add data size to written header size. We do not count the initial file name
3541 that is in the file, but we do add one extra for the notional blank line that
3542 precedes the data. This total differs from message_size in that it include the
3543 added Received: header and any other headers that got created locally. */
3546 fstat(data_fd, &statbuf);
3548 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3550 /* Generate a "message received" log entry. We do this by building up a dynamic
3551 string as required. Since we commonly want to add two items at a time, use a
3552 macro to simplify the coding. We log the arrival of a new message while the
3553 file is still locked, just in case the machine is *really* fast, and delivers
3554 it first! Include any message id that is in the message - since the syntax of a
3555 message id is actually an addr-spec, we can use the parse routine to canonicize
3560 s = store_get(size);
3562 s = string_append(s, &size, &sptr, 2, US"<= ",
3563 (sender_address[0] == 0)? US"<>" : sender_address);
3564 if (message_reference != NULL)
3565 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3567 s = add_host_info_for_log(s, &size, &sptr);
3570 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3571 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3572 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3574 s = string_append(s, &size, &sptr, 2, US" CV=",
3575 tls_certificate_verified? "yes":"no");
3576 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3577 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3578 string_printing(tls_peerdn), US"\"");
3579 if ((log_extra_selector & LX_tls_sni) != 0 && tls_sni != NULL)
3580 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3581 string_printing(tls_sni), US"\"");
3584 if (sender_host_authenticated != NULL)
3586 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3587 if (authenticated_id != NULL)
3588 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3591 sprintf(CS big_buffer, "%d", msg_size);
3592 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3594 /* If an addr-spec in a message-id contains a quoted string, it can contain
3595 any characters except " \ and CR and so in particular it can contain NL!
3596 Therefore, make sure we use a printing-characters only version for the log.
3597 Also, allow for domain literals in the message id. */
3599 if (msgid_header != NULL)
3602 BOOL save_allow_domain_literals = allow_domain_literals;
3603 allow_domain_literals = TRUE;
3604 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3605 &errmsg, &start, &end, &domain, FALSE);
3606 allow_domain_literals = save_allow_domain_literals;
3608 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3611 /* If subject logging is turned on, create suitable printing-character
3612 text. By expanding $h_subject: we make use of the MIME decoding. */
3614 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3617 uschar *p = big_buffer;
3618 uschar *ss = expand_string(US"$h_subject:");
3620 /* Backslash-quote any double quotes or backslashes so as to make a
3621 a C-like string, and turn any non-printers into escape sequences. */
3624 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3626 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3631 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3634 /* Terminate the string: string_cat() and string_append() leave room, but do
3635 not put the zero in. */
3639 /* Create a message log file if message logs are being used and this message is
3640 not blackholed. Write the reception stuff to it. We used to leave message log
3641 creation until the first delivery, but this has proved confusing for some
3644 if (message_logs && blackholed_by == NULL)
3648 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3650 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3652 if (fd < 0 && errno == ENOENT)
3655 sprintf(CS temp, "msglog/%s", message_subdir);
3656 if (message_subdir[0] == 0) temp[6] = 0;
3657 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3658 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3663 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3664 spool_name, strerror(errno));
3669 FILE *message_log = fdopen(fd, "a");
3670 if (message_log == NULL)
3672 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3673 spool_name, strerror(errno));
3678 uschar *now = tod_stamp(tod_log);
3679 fprintf(message_log, "%s Received from %s\n", now, s+3);
3680 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3682 if (queue_only_policy) fprintf(message_log,
3683 "%s no immediate delivery: queued by %s\n", now, queued_by);
3684 (void)fclose(message_log);
3689 /* Everything has now been done for a successful message except logging its
3690 arrival, and outputting an SMTP response. While writing to the log, set a flag
3691 to cause a call to receive_bomb_out() if the log cannot be opened. */
3693 receive_call_bombout = TRUE;
3695 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3696 connection has gone away. This can only be done if there is no unconsumed input
3697 waiting in the local input buffer. We can test for this by calling
3698 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3699 input to be sent following the final dot, so the presence of following input is
3702 If the connection is still present, but there is no unread input for the
3703 socket, the result of a select() call will be zero. If, however, the connection
3704 has gone away, or if there is pending input, the result of select() will be
3705 non-zero. The two cases can be distinguished by trying to read the next input
3706 character. If we succeed, we can unread it so that it remains in the local
3707 buffer for handling later. If not, the connection has been lost.
3709 Of course, since TCP/IP is asynchronous, there is always a chance that the
3710 connection will vanish between the time of this test and the sending of the
3711 response, but the chance of this happening should be small. */
3713 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3714 !receive_smtp_buffered())
3717 fd_set select_check;
3718 FD_ZERO(&select_check);
3719 FD_SET(fileno(smtp_in), &select_check);
3723 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3725 int c = (receive_getc)();
3726 if (c != EOF) (receive_ungetc)(c); else
3728 uschar *msg = US"SMTP connection lost after final dot";
3729 smtp_reply = US""; /* No attempt to send a response */
3730 smtp_yield = FALSE; /* Nothing more on this connection */
3732 /* Re-use the log line workspace */
3735 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3736 s = add_host_info_for_log(s, &size, &sptr);
3738 log_write(0, LOG_MAIN, "%s", s);
3740 /* Delete the files for this aborted message. */
3742 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3743 message_subdir, message_id);
3744 Uunlink(spool_name);
3746 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3747 message_subdir, message_id);
3748 Uunlink(spool_name);
3750 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3751 message_subdir, message_id);
3752 Uunlink(spool_name);
3759 /* The connection has not gone away; we really are going to take responsibility
3760 for this message. */
3762 /*XXX cutthrough - had sender last-dot; assume we've sent or bufferred all
3765 Send dot onward. If accepted, can the spooled files, log as delivered and accept
3766 the sender's dot (below).
3767 If not accepted: copy response to sender, can the spooled files, log approriately.
3769 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3771 if(cutthrough_fd >= 0)
3773 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the messsage */
3776 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3777 /* logging was done in finaldot() */
3778 if(data_file != NULL)
3780 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3781 message_subdir, message_id);
3782 Uunlink(spool_name);
3783 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3784 message_subdir, message_id);
3785 Uunlink(spool_name);
3786 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3787 message_subdir, message_id);
3788 Uunlink(spool_name);
3792 default: /* Unknown response, or error. Treat as temp-reject. */
3793 case '4': /* Temp-reject. If we wrote spoolfiles, keep them and accept. */
3794 /* If not, temp-reject the source. */
3795 /*XXX could we mark the spoolfile queue-only or already-tried? */
3796 log_write(0, LOG_MAIN, "cutthrough target temp-reject: %s", msg);
3797 if(data_file == NULL)
3798 smtp_reply= msg; /* Pass on the exact error */
3801 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
3802 log_write(0, LOG_MAIN, "cutthrough target perm-reject: %s", msg);
3803 smtp_reply= msg; /* Pass on the exact error */
3804 if(data_file != NULL)
3806 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3807 message_subdir, message_id);
3808 Uunlink(spool_name);
3809 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3810 message_subdir, message_id);
3811 Uunlink(spool_name);
3812 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3813 message_subdir, message_id);
3814 Uunlink(spool_name);
3820 if(smtp_reply == NULL)
3822 log_write(0, LOG_MAIN |
3823 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3824 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3827 /* Log any control actions taken by an ACL or local_scan(). */
3829 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3830 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3831 "no immediate delivery: queued by %s", queued_by);
3833 receive_call_bombout = FALSE;
3835 store_reset(s); /* The store for the main log message can be reused */
3837 /* If the message is frozen, and freeze_tell is set, do the telling. */
3839 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3841 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3842 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3843 message_id, frozen_by, sender_address);
3847 /* Either a message has been successfully received and written to the two spool
3848 files, or an error in writing the spool has occurred for an SMTP message, or
3849 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
3850 we will have already given up because there's no point in carrying on!) In
3851 either event, we must now close (and thereby unlock) the data file. In the
3852 successful case, this leaves the message on the spool, ready for delivery. In
3853 the error case, the spool file will be deleted. Then tidy up store, interact
3854 with an SMTP call if necessary, and return.
3856 A fflush() was done earlier in the expectation that any write errors on the
3857 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3858 possible for fclose() to fail - but what to do? What has happened to the lock
3863 process_info[process_info_len] = 0; /* Remove message id */
3864 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
3866 /* Now reset signal handlers to their defaults */
3868 signal(SIGTERM, SIG_DFL);
3869 signal(SIGINT, SIG_DFL);
3871 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3872 value, which defaults TRUE - meaning there may be more incoming messages from
3873 this connection. For non-SMTP callers (where there is only ever one message),
3874 the default is FALSE. */
3880 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3881 is set to the response that should be sent. When it is NULL, we generate
3882 default responses. After an ACL error or local_scan() error, the response has
3883 already been sent, and smtp_reply is an empty string to indicate this. */
3885 if (!smtp_batched_input)
3887 /*XXX cutthrough - here's where the originating sender gets given the data-acceptance */
3888 if (smtp_reply == NULL)
3890 if (fake_response != OK)
3891 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
3892 fake_response_text);
3894 /* An OK response is required; use "message" text if present. */
3896 else if (user_msg != NULL)
3898 uschar *code = US"250";
3900 smtp_message_code(&code, &len, &user_msg, NULL);
3901 smtp_respond(code, len, TRUE, user_msg);
3904 /* Default OK response */
3907 smtp_printf("250 OK id=%s\r\n", message_id);
3910 "\n**** SMTP testing: that is not a real message id!\n\n");
3913 /* smtp_reply is set non-empty */
3915 else if (smtp_reply[0] != 0)
3917 if (fake_response != OK && (smtp_reply[0] == '2'))
3918 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
3919 fake_response_text);
3921 smtp_printf("%.1024s\r\n", smtp_reply);
3924 if (cutthrough_delivery)
3926 log_write(0, LOG_MAIN, "Completed");
3927 message_id[0] = 0; /* Prevent a delivery from starting */
3931 /* For batched SMTP, generate an error message on failure, and do
3932 nothing on success. The function moan_smtp_batch() does not return -
3933 it exits from the program with a non-zero return code. */
3935 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
3939 /* If blackholing, we can immediately log this message's sad fate. The data
3940 file has already been unlinked, and the header file was never written to disk.
3941 We must now indicate that nothing was received, to prevent a delivery from
3944 if (blackholed_by != NULL)
3946 uschar *detail = (local_scan_data != NULL)?
3947 string_printing(local_scan_data) :
3948 string_sprintf("(%s discarded recipients)", blackholed_by);
3949 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
3950 log_write(0, LOG_MAIN, "Completed");
3954 /* Reset headers so that logging of rejects for a subsequent message doesn't
3955 include them. It is also important to set header_last = NULL before exiting
3956 from this function, as this prevents certain rewrites that might happen during
3957 subsequent verifying (of another incoming message) from trying to add headers
3958 when they shouldn't. */
3960 header_list = header_last = NULL;
3962 return yield; /* TRUE if more messages (SMTP only) */
3965 /* End of receive.c */