1 /* $Cambridge: exim/src/src/receive.c,v 1.49 2009/10/15 13:49:43 tom Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2007 */
8 /* See the file NOTICE for conditions of use and distribution. */
10 /* Code for receiving a message and setting up spool files. */
14 #ifdef EXPERIMENTAL_DCC
18 /*************************************************
19 * Local static variables *
20 *************************************************/
22 static FILE *data_file = NULL;
23 static int data_fd = -1;
24 static uschar spool_name[256];
28 /*************************************************
29 * Non-SMTP character reading functions *
30 *************************************************/
32 /* These are the default functions that are set up in the variables such as
33 receive_getc initially. They just call the standard functions, passing stdin as
34 the file. (When SMTP input is occurring, different functions are used by
35 changing the pointer variables.) */
46 return ungetc(c, stdin);
64 /*************************************************
65 * Check that a set sender is allowed *
66 *************************************************/
68 /* This function is called when a local caller sets an explicit sender address.
69 It checks whether this is permitted, which it is for trusted callers.
70 Otherwise, it must match the pattern(s) in untrusted_set_sender.
72 Arguments: the proposed sender address
73 Returns: TRUE for a trusted caller
74 TRUE if the address has been set, untrusted_set_sender has been
75 set, and the address matches something in the list
80 receive_check_set_sender(uschar *newsender)
83 if (trusted_caller) return TRUE;
84 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
85 qnewsender = (Ustrchr(newsender, '@') != NULL)?
86 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
88 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
95 /*************************************************
96 * Read space info for a partition *
97 *************************************************/
99 /* This function is called by receive_check_fs() below, and also by string
100 expansion for variables such as $spool_space. The field names for the statvfs
101 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
102 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
103 have inodes, and they return -1 for the number available.
105 Later: It turns out that some file systems that do not have the concept of
106 inodes return 0 rather than -1. Such systems should also return 0 for the total
107 number of inodes, so we require that to be greater than zero before returning
111 isspool TRUE for spool partition, FALSE for log partition
112 inodeptr address of int to receive inode count; -1 if there isn't one
114 Returns: available on-root space, in kilobytes
115 -1 for log partition if there isn't one
117 All values are -1 if the STATFS functions are not available.
121 receive_statvfs(BOOL isspool, int *inodeptr)
124 struct STATVFS statbuf;
129 /* The spool directory must always exist. */
133 path = spool_directory;
137 /* Need to cut down the log file path to the directory, and to ignore any
138 appearance of "syslog" in it. */
142 int sep = ':'; /* Not variable - outside scripts use */
143 uschar *p = log_file_path;
146 /* An empty log_file_path means "use the default". This is the same as an
147 empty item in a list. */
149 if (*p == 0) p = US":";
150 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
152 if (Ustrcmp(path, "syslog") != 0) break;
155 if (path == NULL) /* No log files */
161 /* An empty string means use the default, which is in the spool directory.
162 But don't just use the spool directory, as it is possible that the log
163 subdirectory has been symbolically linked elsewhere. */
167 sprintf(CS buffer, CS"%s/log", CS spool_directory);
173 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
177 /* We now have the path; do the business */
179 memset(&statbuf, 0, sizeof(statbuf));
181 if (STATVFS(CS path, &statbuf) != 0)
183 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
184 "%s directory %s: %s", name, spool_directory, strerror(errno));
185 smtp_closedown(US"spool or log directory problem");
186 exim_exit(EXIT_FAILURE);
189 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
191 /* Disks are getting huge. Take care with computing the size in kilobytes. */
193 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
195 /* Unable to find partition sizes in this environment. */
206 /*************************************************
207 * Check space on spool and log partitions *
208 *************************************************/
210 /* This function is called before accepting a message; if any thresholds are
211 set, it checks them. If a message_size is supplied, it checks that there is
212 enough space for that size plus the threshold - i.e. that the message won't
213 reduce the space to the threshold. Not all OS have statvfs(); for those that
214 don't, this function always returns TRUE. For some OS the old function and
215 struct name statfs is used; that is handled by a macro, defined in exim.h.
218 msg_size the (estimated) size of an incoming message
220 Returns: FALSE if there isn't enough space, or if the information cannot
222 TRUE if no check was done or there is enough space
226 receive_check_fs(int msg_size)
230 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
232 space = receive_statvfs(TRUE, &inodes);
235 debug_printf("spool directory space = %dK inodes = %d "
236 "check_space = %dK inodes = %d msg_size = %d\n",
237 space, inodes, check_spool_space, check_spool_inodes, msg_size);
239 if ((space >= 0 && space < check_spool_space) ||
240 (inodes >= 0 && inodes < check_spool_inodes))
242 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
243 "inodes=%d", space, inodes);
248 if (check_log_space > 0 || check_log_inodes > 0)
250 space = receive_statvfs(FALSE, &inodes);
253 debug_printf("log directory space = %dK inodes = %d "
254 "check_space = %dK inodes = %d\n",
255 space, inodes, check_log_space, check_log_inodes);
257 if ((space >= 0 && space < check_log_space) ||
258 (inodes >= 0 && inodes < check_log_inodes))
260 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
261 "inodes=%d", space, inodes);
271 /*************************************************
272 * Bomb out while reading a message *
273 *************************************************/
275 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
276 received, or if there is a timeout. A rarer case might be if the log files are
277 screwed up and Exim can't open them to record a message's arrival. Handling
278 that case is done by setting a flag to cause the log functions to call this
279 function if there is an ultimate disaster. That is why it is globally
283 reason text reason to pass to the not-quit ACL
284 msg default SMTP response to give if in an SMTP session
289 receive_bomb_out(uschar *reason, uschar *msg)
291 /* If spool_name is set, it contains the name of the data file that is being
292 written. Unlink it before closing so that it cannot be picked up by a delivery
293 process. Ensure that any header file is also removed. */
295 if (spool_name[0] != 0)
298 spool_name[Ustrlen(spool_name) - 1] = 'H';
302 /* Now close the file if it is open, either as a fd or a stream. */
304 if (data_file != NULL) (void)fclose(data_file);
305 else if (data_fd >= 0) (void)close(data_fd);
307 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
308 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
313 if (smtp_batched_input)
314 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
315 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
316 smtp_active_hostname, msg);
319 /* Exit from the program (non-BSMTP cases) */
321 exim_exit(EXIT_FAILURE);
325 /*************************************************
326 * Data read timeout *
327 *************************************************/
329 /* Handler function for timeouts that occur while reading the data that
332 Argument: the signal number
337 data_timeout_handler(int sig)
341 sig = sig; /* Keep picky compilers happy */
345 msg = US"SMTP incoming data timeout";
346 log_write(L_lost_incoming_connection,
347 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
349 (sender_fullhost != NULL)? sender_fullhost : US"local process",
354 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
355 log_write(L_lost_incoming_connection,
356 LOG_MAIN, "timed out while reading local message");
359 receive_bomb_out(US"data-timeout", msg); /* Does not return */
364 /*************************************************
365 * local_scan() timeout *
366 *************************************************/
368 /* Handler function for timeouts that occur while running a local_scan()
371 Argument: the signal number
376 local_scan_timeout_handler(int sig)
378 sig = sig; /* Keep picky compilers happy */
379 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
380 "message temporarily rejected (size %d)", message_size);
381 /* Does not return */
382 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
387 /*************************************************
388 * local_scan() crashed *
389 *************************************************/
391 /* Handler function for signals that occur while running a local_scan()
394 Argument: the signal number
399 local_scan_crash_handler(int sig)
401 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
402 "signal %d - message temporarily rejected (size %d)", sig, message_size);
403 /* Does not return */
404 receive_bomb_out(US"local-scan-error", US"local verification problem");
408 /*************************************************
409 * SIGTERM or SIGINT received *
410 *************************************************/
412 /* Handler for SIGTERM or SIGINT signals that occur while reading the
413 data that comprises a message.
415 Argument: the signal number
420 data_sigterm_sigint_handler(int sig)
426 msg = US"Service not available - SIGTERM or SIGINT received";
427 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
428 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
432 if (filter_test == FTEST_NONE)
434 fprintf(stderr, "\nexim: %s received - message abandoned\n",
435 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
436 log_write(0, LOG_MAIN, "%s received while reading local message",
437 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
441 receive_bomb_out(US"signal-exit", msg); /* Does not return */
446 /*************************************************
447 * Add new recipient to list *
448 *************************************************/
450 /* This function builds a list of recipient addresses in argc/argv
454 recipient the next address to add to recipients_list
455 pno parent number for fixed aliases; -1 otherwise
461 receive_add_recipient(uschar *recipient, int pno)
463 if (recipients_count >= recipients_list_max)
465 recipient_item *oldlist = recipients_list;
466 int oldmax = recipients_list_max;
467 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
468 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
470 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
473 recipients_list[recipients_count].address = recipient;
474 recipients_list[recipients_count].pno = pno;
475 #ifdef EXPERIMENTAL_BRIGHTMAIL
476 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
477 /* reset optin string pointer for next recipient */
478 bmi_current_optin = NULL;
480 recipients_list[recipients_count++].errors_to = NULL;
486 /*************************************************
487 * Remove a recipient from the list *
488 *************************************************/
490 /* This function is provided for local_scan() to use.
493 recipient address to remove
495 Returns: TRUE if it did remove something; FALSE otherwise
499 receive_remove_recipient(uschar *recipient)
502 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
504 for (count = 0; count < recipients_count; count++)
506 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
508 if ((--recipients_count - count) > 0)
509 memmove(recipients_list + count, recipients_list + count + 1,
510 (recipients_count - count)*sizeof(recipient_item));
521 /*************************************************
522 * Read data portion of a non-SMTP message *
523 *************************************************/
525 /* This function is called to read the remainder of a message (following the
526 header) when the input is not from SMTP - we are receiving a local message on
527 a standard input stream. The message is always terminated by EOF, and is also
528 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
529 two cases for maximum efficiency.
531 Ensure that the body ends with a newline. This will naturally be the case when
532 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
533 as "sequences of lines" - this of course strictly applies only to SMTP, but
534 deliveries into BSD-type mailbox files also require it. Exim used to have a
535 flag for doing this at delivery time, but as it was always set for all
536 transports, I decided to simplify things by putting the check here instead.
538 There is at least one MUA (dtmail) that sends CRLF via this interface, and
539 other programs are known to do this as well. Exim used to have a option for
540 dealing with this: in July 2003, after much discussion, the code has been
541 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
543 However, for the case when a dot on a line by itself terminates a message, the
544 only recognized terminating sequences before and after the dot are LF and CRLF.
545 Otherwise, having read EOL . CR, you don't know whether to read another
548 Internally, in messages stored in Exim's spool files, LF is used as the line
549 terminator. Under the new regime, bare CRs will no longer appear in these
553 fout a FILE to which to write the message
555 Returns: One of the END_xxx values indicating why it stopped reading
559 read_message_data(FILE *fout)
563 register int linelength = 0;
565 /* Handle the case when only EOF terminates the message */
569 register int last_ch = '\n';
571 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
573 if (ch == 0) body_zerocount++;
574 if (last_ch == '\r' && ch != '\n')
576 if (linelength > max_received_linelength)
577 max_received_linelength = linelength;
579 if (fputc('\n', fout) == EOF) return END_WERROR;
583 if (ch == '\r') continue;
585 if (fputc(ch, fout) == EOF) return END_WERROR;
588 if (linelength > max_received_linelength)
589 max_received_linelength = linelength;
594 if (++message_size > thismessage_size_limit) return END_SIZE;
599 if (linelength > max_received_linelength)
600 max_received_linelength = linelength;
601 if (fputc('\n', fout) == EOF) return END_WERROR;
609 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
613 while ((ch = (receive_getc)()) != EOF)
615 if (ch == 0) body_zerocount++;
618 case 0: /* Normal state (previous char written) */
622 if (linelength > max_received_linelength)
623 max_received_linelength = linelength;
628 { ch_state = 2; continue; }
631 case 1: /* After written "\n" */
632 if (ch == '.') { ch_state = 3; continue; }
633 if (ch != '\n') ch_state = 0; else linelength = -1;
637 body_linecount++; /* After unwritten "\r" */
638 if (linelength > max_received_linelength)
639 max_received_linelength = linelength;
647 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
648 if (ch == '\r') continue;
654 case 3: /* After "\n." (\n written, dot not) */
655 if (ch == '\n') return END_DOT;
656 if (ch == '\r') { ch_state = 4; continue; }
659 if (fputc('.', fout) == EOF) return END_WERROR;
663 case 4: /* After "\n.\r" (\n written, rest not) */
664 if (ch == '\n') return END_DOT;
667 if (fputs(".\n", fout) == EOF) return END_WERROR;
668 if (ch == '\r') { ch_state = 2; continue; }
674 if (fputc(ch, fout) == EOF) return END_WERROR;
675 if (++message_size > thismessage_size_limit) return END_SIZE;
678 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
679 the message ends with a newline, and we must also write any characters that
680 were saved up while testing for an ending dot. */
684 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
685 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
686 message_size += Ustrlen(ends[ch_state]);
696 /*************************************************
697 * Read data portion of an SMTP message *
698 *************************************************/
700 /* This function is called to read the remainder of an SMTP message (after the
701 headers), or to skip over it when an error has occurred. In this case, the
702 output file is passed as NULL.
704 If any line begins with a dot, that character is skipped. The input should only
705 be successfully terminated by CR LF . CR LF unless it is local (non-network)
706 SMTP, in which case the CRs are optional, but...
708 FUDGE: It seems that sites on the net send out messages with just LF
709 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
710 we make the CRs optional in all cases.
712 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
713 well, so that there are no CRs in spooled messages. However, the message
714 terminating dot is not recognized between two bare CRs.
717 fout a FILE to which to write the message; NULL if skipping
719 Returns: One of the END_xxx values indicating why it stopped reading
723 read_message_data_smtp(FILE *fout)
727 register int linelength = 0;
729 while ((ch = (receive_getc)()) != EOF)
731 if (ch == 0) body_zerocount++;
734 case 0: /* After LF or CRLF */
738 continue; /* Don't ever write . after LF */
742 /* Else fall through to handle as normal uschar. */
744 case 1: /* Normal state */
749 if (linelength > max_received_linelength)
750 max_received_linelength = linelength;
760 case 2: /* After (unwritten) CR */
762 if (linelength > max_received_linelength)
763 max_received_linelength = linelength;
772 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
773 if (ch != '\r') ch_state = 1; else continue;
777 case 3: /* After [CR] LF . */
785 ch_state = 1; /* The dot itself is removed */
788 case 4: /* After [CR] LF . CR */
789 if (ch == '\n') return END_DOT;
792 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
802 /* Add the character to the spool file, unless skipping; then loop for the
809 if (fputc(ch, fout) == EOF) return END_WERROR;
810 if (message_size > thismessage_size_limit) return END_SIZE;
814 /* Fall through here if EOF encountered. This indicates some kind of error,
815 since a correct message is terminated by [CR] LF . [CR] LF. */
823 /*************************************************
824 * Swallow SMTP message *
825 *************************************************/
827 /* This function is called when there has been some kind of error while reading
828 an SMTP message, and the remaining data may need to be swallowed. It is global
829 because it is called from smtp_closedown() to shut down an incoming call
832 Argument: a FILE from which to read the message
837 receive_swallow_smtp(void)
839 if (message_ended >= END_NOTENDED)
840 message_ended = read_message_data_smtp(NULL);
845 /*************************************************
846 * Handle lost SMTP connection *
847 *************************************************/
849 /* This function logs connection loss incidents and generates an appropriate
852 Argument: additional data for the message
853 Returns: the SMTP response
857 handle_lost_connection(uschar *s)
859 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
860 "%s lost while reading message data%s", smtp_get_connection_info(), s);
861 return US"421 Lost incoming connection";
867 /*************************************************
868 * Handle a non-smtp reception error *
869 *************************************************/
871 /* This function is called for various errors during the reception of non-SMTP
872 messages. It either sends a message to the sender of the problem message, or it
873 writes to the standard error stream.
876 errcode code for moan_to_sender(), identifying the error
877 text1 first message text, passed to moan_to_sender()
878 text2 second message text, used only for stderrr
879 error_rc code to pass to exim_exit if no problem
880 f FILE containing body of message (may be stdin)
881 hptr pointer to instore headers or NULL
883 Returns: calls exim_exit(), which does not return
887 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
888 FILE *f, header_line *hptr)
890 if (error_handling == ERRORS_SENDER)
894 eblock.text1 = text1;
895 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
896 error_rc = EXIT_FAILURE;
898 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
905 /*************************************************
906 * Add header lines set up by ACL *
907 *************************************************/
909 /* This function is called to add the header lines that were set up by
910 statements in an ACL to the list of headers in memory. It is done in two stages
911 like this, because when the ACL for RCPT is running, the other headers have not
912 yet been received. This function is called twice; once just before running the
913 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
914 are visible to the DATA ACL.
916 Originally these header lines were added at the end. Now there is support for
917 three different places: top, bottom, and after the Received: header(s). There
918 will always be at least one Received: header, even if it is marked deleted, and
919 even if something else has been put in front of it.
922 acl_name text to identify which ACL
928 add_acl_headers(uschar *acl_name)
930 header_line *h, *next;
931 header_line *last_received = NULL;
933 if (acl_added_headers == NULL) return;
934 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
936 for (h = acl_added_headers; h != NULL; h = next)
943 h->next = header_list;
945 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
949 if (last_received == NULL)
951 last_received = header_list;
952 while (!header_testname(last_received, US"Received", 8, FALSE))
953 last_received = last_received->next;
954 while (last_received->next != NULL &&
955 header_testname(last_received->next, US"Received", 8, FALSE))
956 last_received = last_received->next;
958 h->next = last_received->next;
959 last_received->next = h;
960 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
964 /* add header before any header which is NOT Received: or Resent- */
965 last_received = header_list;
966 while ( (last_received->next != NULL) &&
967 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
968 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
969 last_received = last_received->next;
970 /* last_received now points to the last Received: or Resent-* header
971 in an uninterrupted chain of those header types (seen from the beginning
972 of all headers. Our current header must follow it. */
973 h->next = last_received->next;
974 last_received->next = h;
975 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
980 header_last->next = h;
984 if (h->next == NULL) header_last = h;
986 /* Check for one of the known header types (From:, To:, etc.) though in
987 practice most added headers are going to be "other". Lower case
988 identification letters are never stored with the header; they are used
989 for existence tests when messages are received. So discard any lower case
992 h->type = header_checkname(h, FALSE);
993 if (h->type >= 'a') h->type = htype_other;
995 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
998 acl_added_headers = NULL;
999 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1004 /*************************************************
1005 * Add host information for log line *
1006 *************************************************/
1008 /* Called for acceptance and rejecting log lines. This adds information about
1009 the calling host to a string that is being built dynamically.
1012 s the dynamic string
1013 sizeptr points to the size variable
1014 ptrptr points to the pointer variable
1016 Returns: the extended string
1020 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1022 if (sender_fullhost != NULL)
1024 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1025 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1026 interface_address != NULL)
1028 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1030 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1033 if (sender_ident != NULL)
1034 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1035 if (received_protocol != NULL)
1036 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1042 #ifdef WITH_CONTENT_SCAN
1044 /*************************************************
1045 * Run the MIME ACL on a message *
1046 *************************************************/
1048 /* This code is in a subroutine so that it can be used for both SMTP
1049 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1052 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1053 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1054 smtp_reply_ptr Where SMTP reply is being built
1055 blackholed_by_ptr Where "blackholed by" message is being built
1057 Returns: TRUE to carry on; FALSE to abandon the message
1061 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1062 uschar **blackholed_by_ptr)
1065 uschar rfc822_file_path[2048];
1066 unsigned long mbox_size;
1067 header_line *my_headerlist;
1068 uschar *user_msg, *log_msg;
1069 int mime_part_count_buffer = -1;
1072 memset(CS rfc822_file_path,0,2048);
1074 /* check if it is a MIME message */
1075 my_headerlist = header_list;
1076 while (my_headerlist != NULL)
1078 /* skip deleted headers */
1079 if (my_headerlist->type == '*')
1081 my_headerlist = my_headerlist->next;
1084 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1086 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1089 my_headerlist = my_headerlist->next;
1092 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1096 /* make sure the eml mbox file is spooled up */
1097 mbox_file = spool_mbox(&mbox_size);
1098 if (mbox_file == NULL) {
1099 /* error while spooling */
1100 log_write(0, LOG_MAIN|LOG_PANIC,
1101 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1102 Uunlink(spool_name);
1104 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1105 message_id[0] = 0; /* Indicate no message accepted */
1106 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1107 return FALSE; /* Indicate skip to end of receive function */
1113 mime_part_count = -1;
1114 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1115 (void)fclose(mbox_file);
1117 if (Ustrlen(rfc822_file_path) > 0)
1119 mime_part_count = mime_part_count_buffer;
1121 if (unlink(CS rfc822_file_path) == -1)
1123 log_write(0, LOG_PANIC,
1124 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1129 /* check if we must check any message/rfc822 attachments */
1132 uschar temp_path[1024];
1134 struct dirent *entry;
1137 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1140 tempdir = opendir(CS temp_path);
1144 entry = readdir(tempdir);
1145 if (entry == NULL) break;
1146 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1148 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1149 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1157 mbox_file = Ufopen(rfc822_file_path,"rb");
1158 if (mbox_file == NULL)
1160 log_write(0, LOG_PANIC,
1161 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1162 unlink(CS rfc822_file_path);
1165 /* set RFC822 expansion variable */
1167 mime_part_count_buffer = mime_part_count;
1168 goto MIME_ACL_CHECK;
1173 add_acl_headers(US"MIME");
1176 recipients_count = 0;
1177 *blackholed_by_ptr = US"MIME ACL";
1181 Uunlink(spool_name);
1183 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1184 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1185 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1186 message_id[0] = 0; /* Indicate no message accepted */
1187 return FALSE; /* Cause skip to end of receive function */
1193 #endif /* WITH_CONTENT_SCAN */
1196 /*************************************************
1198 *************************************************/
1200 /* Receive a message on the given input, and put it into a pair of spool files.
1201 Either a non-null list of recipients, or the extract flag will be true, or
1202 both. The flag sender_local is true for locally generated messages. The flag
1203 submission_mode is true if an ACL has obeyed "control = submission". The flag
1204 suppress_local_fixups is true if an ACL has obeyed "control =
1205 suppress_local_fixups". The flag smtp_input is true if the message is to be
1206 handled using SMTP conventions about termination and lines starting with dots.
1207 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1209 If a message was successfully read, message_id[0] will be non-zero.
1211 The general actions of this function are:
1213 . Read the headers of the message (if any) into a chain of store
1216 . If there is a "sender:" header and the message is locally originated,
1217 throw it away, unless the caller is trusted, or unless
1218 active_local_sender_retain is set - which can only happen if
1219 active_local_from_check is false.
1221 . If recipients are to be extracted from the message, build the
1222 recipients list from the headers, removing any that were on the
1223 original recipients list (unless extract_addresses_remove_arguments is
1224 false), and at the same time, remove any bcc header that may be present.
1226 . Get the spool file for the data, sort out its unique name, open
1227 and lock it (but don't give it the name yet).
1229 . Generate a "Message-Id" header if the message doesn't have one, for
1230 locally-originated messages.
1232 . Generate a "Received" header.
1234 . Ensure the recipients list is fully qualified and rewritten if necessary.
1236 . If there are any rewriting rules, apply them to the sender address
1237 and also to the headers.
1239 . If there is no from: header, generate one, for locally-generated messages
1240 and messages in "submission mode" only.
1242 . If the sender is local, check that from: is correct, and if not, generate
1243 a Sender: header, unless message comes from a trusted caller, or this
1244 feature is disabled by active_local_from_check being false.
1246 . If there is no "date" header, generate one, for locally-originated
1247 or submission mode messages only.
1249 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1250 dot_ends mode, to the data file. Leave it open, to hold the lock.
1252 . Write the envelope and the headers to a new file.
1254 . Set the name for the header file; close it.
1256 . Set the name for the data file; close it.
1258 Because this function can potentially be called many times in a single
1259 SMTP connection, all store should be got by store_get(), so that it will be
1260 automatically retrieved after the message is accepted.
1262 FUDGE: It seems that sites on the net send out messages with just LF
1263 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1264 we make the CRs optional in all cases.
1266 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1267 new regime is now in place in which bare CRs in header lines are turned into LF
1268 followed by a space, so as not to terminate the header line.
1270 February 2004: A bare LF in a header line in a message whose first line was
1271 terminated by CRLF is treated in the same way as a bare CR.
1274 extract_recip TRUE if recipients are to be extracted from the message's
1277 Returns: TRUE there are more messages to be read (SMTP input)
1278 FALSE there are no more messages to be read (non-SMTP input
1279 or SMTP connection collapsed, or other failure)
1281 When reading a message for filter testing, the returned value indicates
1282 whether the headers (which is all that is read) were terminated by '.' or
1286 receive_msg(BOOL extract_recip)
1290 int process_info_len = Ustrlen(process_info);
1291 int error_rc = (error_handling == ERRORS_SENDER)?
1292 errors_sender_rc : EXIT_FAILURE;
1293 int header_size = 256;
1294 int start, end, domain, size, sptr;
1297 int prevlines_length = 0;
1299 register int ptr = 0;
1301 BOOL contains_resent_headers = FALSE;
1302 BOOL extracted_ignored = FALSE;
1303 BOOL first_line_ended_crlf = TRUE_UNSET;
1304 BOOL smtp_yield = TRUE;
1307 BOOL resents_exist = FALSE;
1308 uschar *resent_prefix = US"";
1309 uschar *blackholed_by = NULL;
1310 uschar *blackhole_log_msg = US"";
1313 error_block *bad_addresses = NULL;
1315 uschar *frozen_by = NULL;
1316 uschar *queued_by = NULL;
1319 struct stat statbuf;
1321 /* Final message to give to SMTP caller, and messages from ACLs */
1323 uschar *smtp_reply = NULL;
1324 uschar *user_msg, *log_msg;
1326 /* Working header pointers */
1328 header_line *h, *next;
1330 /* Flags for noting the existence of certain headers (only one left) */
1332 BOOL date_header_exists = FALSE;
1334 /* Pointers to receive the addresses of headers whose contents we need. */
1336 header_line *from_header = NULL;
1337 header_line *subject_header = NULL;
1338 header_line *msgid_header = NULL;
1339 header_line *received_header;
1341 /* Variables for use when building the Received: header. */
1347 /* Release any open files that might have been cached while preparing to
1348 accept the message - e.g. by verifying addresses - because reading a message
1349 might take a fair bit of real time. */
1353 /* Initialize the chain of headers by setting up a place-holder for Received:
1354 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1355 pointing to the end of the chain to make adding headers simple. */
1357 received_header = header_list = header_last = store_get(sizeof(header_line));
1358 header_list->next = NULL;
1359 header_list->type = htype_old;
1360 header_list->text = NULL;
1361 header_list->slen = 0;
1363 /* Control block for the next header to be read. */
1365 next = store_get(sizeof(header_line));
1366 next->text = store_get(header_size);
1368 /* Initialize message id to be null (indicating no message read), and the
1369 header names list to be the normal list. Indicate there is no data file open
1370 yet, initialize the size and warning count, and deal with no size limit. */
1378 received_count = 1; /* For the one we will add */
1380 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1382 /* While reading the message, the following counts are computed. */
1384 message_linecount = body_linecount = body_zerocount =
1385 max_received_linelength = 0;
1387 #ifndef DISABLE_DKIM
1388 /* Call into DKIM to set up the context. */
1389 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1392 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1393 ids, and fractions of a second are required. See the comments that precede the
1394 message id creation below. */
1396 (void)gettimeofday(&message_id_tv, NULL);
1398 /* For other uses of the received time we can operate with granularity of one
1399 second, and for that we use the global variable received_time. This is for
1400 things like ultimate message timeouts. */
1402 received_time = message_id_tv.tv_sec;
1404 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1405 happen in the smtp_getc() function when it refills its buffer. */
1407 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1409 /* If not SMTP input, timeout happens only if configured, and we just set a
1410 single timeout for the whole message. */
1412 else if (receive_timeout > 0)
1414 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1415 alarm(receive_timeout);
1418 /* SIGTERM and SIGINT are caught always. */
1420 signal(SIGTERM, data_sigterm_sigint_handler);
1421 signal(SIGINT, data_sigterm_sigint_handler);
1423 /* Header lines in messages are not supposed to be very long, though when
1424 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1425 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1426 storing the header, and extend this as necessary using string_cat().
1428 To cope with total lunacies, impose an upper limit on the length of the header
1429 section of the message, as otherwise the store will fill up. We must also cope
1430 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1431 Folded header lines are joined into one string, leaving the '\n' characters
1432 inside them, so that writing them out reproduces the input.
1434 Loop for each character of each header; the next structure for chaining the
1435 header is set up already, with ptr the offset of the next character in
1440 int ch = (receive_getc)();
1442 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1443 SMTP must have a correct "." terminator. */
1445 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1447 smtp_reply = handle_lost_connection(US" (header)");
1449 goto TIDYUP; /* Skip to end of function */
1452 /* See if we are at the current header's size limit - there must be at least
1453 four bytes left. This allows for the new character plus a zero, plus two for
1454 extra insertions when we are playing games with dots and carriage returns. If
1455 we are at the limit, extend the text buffer. This could have been done
1456 automatically using string_cat() but because this is a tightish loop storing
1457 only one character at a time, we choose to do it inline. Normally
1458 store_extend() will be able to extend the block; only at the end of a big
1459 store block will a copy be needed. To handle the case of very long headers
1460 (and sometimes lunatic messages can have ones that are 100s of K long) we
1461 call store_release() for strings that have been copied - if the string is at
1462 the start of a block (and therefore the only thing in it, because we aren't
1463 doing any other gets), the block gets freed. We can only do this because we
1464 know there are no other calls to store_get() going on. */
1466 if (ptr >= header_size - 4)
1468 int oldsize = header_size;
1469 /* header_size += 256; */
1471 if (!store_extend(next->text, oldsize, header_size))
1473 uschar *newtext = store_get(header_size);
1474 memcpy(newtext, next->text, ptr);
1475 store_release(next->text);
1476 next->text = newtext;
1480 /* Cope with receiving a binary zero. There is dispute about whether
1481 these should be allowed in RFC 822 messages. The middle view is that they
1482 should not be allowed in headers, at least. Exim takes this attitude at
1483 the moment. We can't just stomp on them here, because we don't know that
1484 this line is a header yet. Set a flag to cause scanning later. */
1486 if (ch == 0) had_zero++;
1488 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1489 those from data files use just LF. Treat LF in local SMTP input as a
1490 terminator too. Treat EOF as a line terminator always. */
1492 if (ch == EOF) goto EOL;
1494 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1495 other MTAs accept this. We are therefore forced into this "liberalisation"
1496 too, so we accept LF as a line terminator whatever the source of the message.
1497 However, if the first line of the message ended with a CRLF, we treat a bare
1498 LF specially by inserting a white space after it to ensure that the header
1499 line is not terminated. */
1503 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1504 else if (first_line_ended_crlf) receive_ungetc(' ');
1508 /* This is not the end of the line. If this is SMTP input and this is
1509 the first character in the line and it is a "." character, ignore it.
1510 This implements the dot-doubling rule, though header lines starting with
1511 dots aren't exactly common. They are legal in RFC 822, though. If the
1512 following is CRLF or LF, this is the line that that terminates the
1513 entire message. We set message_ended to indicate this has happened (to
1514 prevent further reading), and break out of the loop, having freed the
1515 empty header, and set next = NULL to indicate no data line. */
1517 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1519 ch = (receive_getc)();
1522 ch = (receive_getc)();
1526 ch = '\r'; /* Revert to CR */
1531 message_ended = END_DOT;
1534 break; /* End character-reading loop */
1537 /* For non-SMTP input, the dot at the start of the line was really a data
1538 character. What is now in ch is the following character. We guaranteed
1539 enough space for this above. */
1543 next->text[ptr++] = '.';
1548 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1549 remember this case if this is the first line ending. */
1553 ch = (receive_getc)();
1556 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1560 /* Otherwise, put back the character after CR, and turn the bare CR
1563 ch = (receive_ungetc)(ch);
1564 next->text[ptr++] = '\n';
1569 /* We have a data character for the header line. */
1571 next->text[ptr++] = ch; /* Add to buffer */
1572 message_size++; /* Total message size so far */
1574 /* Handle failure due to a humungously long header section. The >= allows
1575 for the terminating \n. Add what we have so far onto the headers list so
1576 that it gets reflected in any error message, and back up the just-read
1579 if (message_size >= header_maxsize)
1581 next->text[ptr] = 0;
1583 next->type = htype_other;
1585 header_last->next = next;
1588 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1589 "%s (more than %d characters): message abandoned",
1590 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1594 smtp_reply = US"552 Message header is ridiculously long";
1595 receive_swallow_smtp();
1596 goto TIDYUP; /* Skip to end of function */
1601 give_local_error(ERRMESS_VLONGHEADER,
1602 string_sprintf("message header longer than %d characters received: "
1603 "message not accepted", header_maxsize), US"", error_rc, stdin,
1605 /* Does not return */
1609 continue; /* With next input character */
1611 /* End of header line reached */
1615 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1617 receive_linecount++;
1618 message_linecount++;
1620 /* Keep track of maximum line length */
1622 if (ptr - prevlines_length > max_received_linelength)
1623 max_received_linelength = ptr - prevlines_length;
1624 prevlines_length = ptr + 1;
1626 /* Now put in the terminating newline. There is always space for
1627 at least two more characters. */
1629 next->text[ptr++] = '\n';
1632 /* A blank line signals the end of the headers; release the unwanted
1633 space and set next to NULL to indicate this. */
1642 /* There is data in the line; see if the next input character is a
1643 whitespace character. If it is, we have a continuation of this header line.
1644 There is always space for at least one character at this point. */
1648 int nextch = (receive_getc)();
1649 if (nextch == ' ' || nextch == '\t')
1651 next->text[ptr++] = nextch;
1653 continue; /* Iterate the loop */
1655 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1656 else ch = EOF; /* Cause main loop to exit at end */
1659 /* We have got to the real line end. Terminate the string and release store
1660 beyond it. If it turns out to be a real header, internal binary zeros will
1661 be squashed later. */
1663 next->text[ptr] = 0;
1665 store_reset(next->text + ptr + 1);
1667 /* Check the running total size against the overall message size limit. We
1668 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1669 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1670 headers - the code to read the body will then also hit the buffer. */
1672 if (message_size > thismessage_size_limit) break;
1674 /* A line that is not syntactically correct for a header also marks
1675 the end of the headers. In this case, we leave next containing the
1676 first data line. This might actually be several lines because of the
1677 continuation logic applied above, but that doesn't matter.
1679 It turns out that smail, and presumably sendmail, accept leading lines
1682 From ph10 Fri Jan 5 12:35 GMT 1996
1684 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1685 find any documentation of this, but for compatibility it had better be
1686 accepted. Exim restricts it to the case of non-smtp messages, and
1687 treats it as an alternative to the -f command line option. Thus it is
1688 ignored except for trusted users or filter testing. Otherwise it is taken
1689 as the sender address, unless -f was used (sendmail compatibility).
1691 It further turns out that some UUCPs generate the From_line in a different
1694 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1696 The regex for matching these things is now capable of recognizing both
1697 formats (including 2- and 4-digit years in the latter). In fact, the regex
1698 is now configurable, as is the expansion string to fish out the sender.
1700 Even further on it has been discovered that some broken clients send
1701 these lines in SMTP messages. There is now an option to ignore them from
1702 specified hosts or networks. Sigh. */
1704 if (header_last == header_list &&
1707 (sender_host_address != NULL &&
1708 verify_check_host(&ignore_fromline_hosts) == OK)
1710 (sender_host_address == NULL && ignore_fromline_local)
1712 regex_match_and_setup(regex_From, next->text, 0, -1))
1714 if (!sender_address_forced)
1716 uschar *uucp_sender = expand_string(uucp_from_sender);
1717 if (uucp_sender == NULL)
1719 log_write(0, LOG_MAIN|LOG_PANIC,
1720 "expansion of \"%s\" failed after matching "
1721 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1725 int start, end, domain;
1727 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1728 &start, &end, &domain, TRUE);
1729 if (newsender != NULL)
1731 if (domain == 0 && newsender[0] != 0)
1732 newsender = rewrite_address_qualify(newsender, FALSE);
1734 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1736 sender_address = newsender;
1738 if (trusted_caller || filter_test != FTEST_NONE)
1740 authenticated_sender = NULL;
1741 originator_name = US"";
1742 sender_local = FALSE;
1745 if (filter_test != FTEST_NONE)
1746 printf("Sender taken from \"From \" line\n");
1753 /* Not a leading "From " line. Check to see if it is a valid header line.
1754 Header names may contain any non-control characters except space and colon,
1759 uschar *p = next->text;
1761 /* If not a valid header line, break from the header reading loop, leaving
1762 next != NULL, indicating that it holds the first line of the body. */
1764 if (isspace(*p)) break;
1765 while (mac_isgraph(*p) && *p != ':') p++;
1766 while (isspace(*p)) p++;
1769 body_zerocount = had_zero;
1773 /* We have a valid header line. If there were any binary zeroes in
1774 the line, stomp on them here. */
1777 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1779 /* It is perfectly legal to have an empty continuation line
1780 at the end of a header, but it is confusing to humans
1781 looking at such messages, since it looks like a blank line.
1782 Reduce confusion by removing redundant white space at the
1783 end. We know that there is at least one printing character
1784 (the ':' tested for above) so there is no danger of running
1787 p = next->text + ptr - 2;
1790 while (*p == ' ' || *p == '\t') p--;
1791 if (*p != '\n') break;
1792 ptr = (p--) - next->text + 1;
1793 message_size -= next->slen - ptr;
1794 next->text[ptr] = 0;
1798 /* Add the header to the chain */
1800 next->type = htype_other;
1802 header_last->next = next;
1805 /* Check the limit for individual line lengths. This comes after adding to
1806 the chain so that the failing line is reflected if a bounce is generated
1807 (for a local message). */
1809 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1811 log_write(0, LOG_MAIN, "overlong message header line received from "
1812 "%s (more than %d characters): message abandoned",
1813 sender_host_unknown? sender_ident : sender_fullhost,
1814 header_line_maxsize);
1818 smtp_reply = US"552 A message header line is too long";
1819 receive_swallow_smtp();
1820 goto TIDYUP; /* Skip to end of function */
1825 give_local_error(ERRMESS_VLONGHDRLINE,
1826 string_sprintf("message header line longer than %d characters "
1827 "received: message not accepted", header_line_maxsize), US"",
1828 error_rc, stdin, header_list->next);
1829 /* Does not return */
1833 /* Note if any resent- fields exist. */
1835 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1837 resents_exist = TRUE;
1838 resent_prefix = US"Resent-";
1842 /* The line has been handled. If we have hit EOF, break out of the loop,
1843 indicating no pending data line. */
1845 if (ch == EOF) { next = NULL; break; }
1847 /* Set up for the next header */
1850 next = store_get(sizeof(header_line));
1851 next->text = store_get(header_size);
1854 prevlines_length = 0;
1855 } /* Continue, starting to read the next header */
1857 /* At this point, we have read all the headers into a data structure in main
1858 store. The first header is still the dummy placeholder for the Received: header
1859 we are going to generate a bit later on. If next != NULL, it contains the first
1860 data line - which terminated the headers before reaching a blank line (not the
1865 debug_printf(">>Headers received:\n");
1866 for (h = header_list->next; h != NULL; h = h->next)
1867 debug_printf("%s", h->text);
1871 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1872 is dropped immediately after valid headers, the next thing we will see is EOF.
1873 We must test for this specially, as further down the reading of the data is
1874 skipped if already at EOF. */
1876 if (smtp_input && (receive_feof)())
1878 smtp_reply = handle_lost_connection(US" (after header)");
1880 goto TIDYUP; /* Skip to end of function */
1883 /* If this is a filter test run and no headers were read, output a warning
1884 in case there is a mistake in the test message. */
1886 if (filter_test != FTEST_NONE && header_list->next == NULL)
1887 printf("Warning: no message headers read\n");
1890 /* Scan the headers to identify them. Some are merely marked for later
1891 processing; some are dealt with here. */
1893 for (h = header_list->next; h != NULL; h = h->next)
1895 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1896 if (is_resent) contains_resent_headers = TRUE;
1898 switch (header_checkname(h, is_resent))
1901 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
1905 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
1908 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1911 if (!resents_exist || is_resent) date_header_exists = TRUE;
1914 /* Same comments as about Return-Path: below. */
1916 case htype_delivery_date:
1917 if (delivery_date_remove) h->type = htype_old;
1920 /* Same comments as about Return-Path: below. */
1922 case htype_envelope_to:
1923 if (envelope_to_remove) h->type = htype_old;
1926 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1927 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1928 header consists of just the login id of the user who called Exim, rewrite
1929 it with the gecos field first. Apply this rule to Resent-From: if there
1930 are resent- fields. */
1933 h->type = htype_from;
1934 if (!resents_exist || is_resent)
1939 uschar *s = Ustrchr(h->text, ':') + 1;
1940 while (isspace(*s)) s++;
1941 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1943 uschar *name = is_resent? US"Resent-From" : US"From";
1944 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1945 originator_login, qualify_domain_sender);
1946 from_header = header_last;
1947 h->type = htype_old;
1948 DEBUG(D_receive|D_rewrite)
1949 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1955 /* Identify the Message-id: header for generating "in-reply-to" in the
1956 autoreply transport. For incoming logging, save any resent- value. In both
1957 cases, take just the first of any multiples. */
1960 if (msgid_header == NULL && (!resents_exist || is_resent))
1967 /* Flag all Received: headers */
1969 case htype_received:
1970 h->type = htype_received;
1974 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1976 case htype_reply_to:
1977 h->type = htype_reply_to;
1980 /* The Return-path: header is supposed to be added to messages when
1981 they leave the SMTP system. We shouldn't receive messages that already
1982 contain Return-path. However, since Exim generates Return-path: on
1983 local delivery, resent messages may well contain it. We therefore
1984 provide an option (which defaults on) to remove any Return-path: headers
1985 on input. Removal actually means flagging as "old", which prevents the
1986 header being transmitted with the message. */
1988 case htype_return_path:
1989 if (return_path_remove) h->type = htype_old;
1991 /* If we are testing a mail filter file, use the value of the
1992 Return-Path: header to set up the return_path variable, which is not
1993 otherwise set. However, remove any <> that surround the address
1994 because the variable doesn't have these. */
1996 if (filter_test != FTEST_NONE)
1998 uschar *start = h->text + 12;
1999 uschar *end = start + Ustrlen(start);
2000 while (isspace(*start)) start++;
2001 while (end > start && isspace(end[-1])) end--;
2002 if (*start == '<' && end[-1] == '>')
2007 return_path = string_copyn(start, end - start);
2008 printf("Return-path taken from \"Return-path:\" header line\n");
2012 /* If there is a "Sender:" header and the message is locally originated,
2013 and from an untrusted caller and suppress_local_fixups is not set, or if we
2014 are in submission mode for a remote message, mark it "old" so that it will
2015 not be transmitted with the message, unless active_local_sender_retain is
2016 set. (This can only be true if active_local_from_check is false.) If there
2017 are any resent- headers in the message, apply this rule to Resent-Sender:
2018 instead of Sender:. Messages with multiple resent- header sets cannot be
2019 tidily handled. (For this reason, at least one MUA - Pine - turns old
2020 resent- headers into X-resent- headers when resending, leaving just one
2024 h->type = ((!active_local_sender_retain &&
2026 (sender_local && !trusted_caller && !suppress_local_fixups)
2030 (!resents_exist||is_resent))?
2031 htype_old : htype_sender;
2034 /* Remember the Subject: header for logging. There is no Resent-Subject */
2040 /* "To:" gets flagged, and the existence of a recipient header is noted,
2041 whether it's resent- or not. */
2046 to_or_cc_header_exists = TRUE;
2052 /* Extract recipients from the headers if that is required (the -t option).
2053 Note that this is documented as being done *before* any address rewriting takes
2054 place. There are two possibilities:
2056 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2057 recipients already listed are to be REMOVED from the message. Smail 3 works
2058 like this. We need to build a non-recipients tree for that list, because in
2059 subsequent processing this data is held in a tree and that's what the
2060 spool_write_header() function expects. Make sure that non-recipient addresses
2061 are fully qualified and rewritten if necessary.
2063 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2064 those in the command line arguments (and it is rumoured some other MTAs do
2065 this). Therefore, there is an option to make Exim behave this way.
2067 *** Notes on "Resent-" header lines ***
2069 The presence of resent-headers in the message makes -t horribly ambiguous.
2070 Experiments with sendmail showed that it uses recipients for all resent-
2071 headers, totally ignoring the concept of "sets of resent- headers" as described
2072 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2073 with all the addresses in one instance of each header.
2075 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2076 error for -t if there were resent- headers in the message. However, after a
2077 discussion on the mailing list, I've learned that there are MUAs that use
2078 resent- headers with -t, and also that the stuff about sets of resent- headers
2079 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2080 message with -t and resent- header lines makes sure that only *its* resent-
2081 headers are present; previous ones are often renamed as X-resent- for example.
2083 Consequently, Exim has been changed so that, if any resent- header lines are
2084 present, the recipients are taken from all of the appropriate resent- lines,
2085 and not from the ordinary To:, Cc:, etc. */
2090 error_block **bnext = &bad_addresses;
2092 if (extract_addresses_remove_arguments)
2094 while (recipients_count-- > 0)
2096 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2097 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2098 tree_add_nonrecipient(s);
2100 recipients_list = NULL;
2101 recipients_count = recipients_list_max = 0;
2104 /* Now scan the headers */
2106 for (h = header_list->next; h != NULL; h = h->next)
2108 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2109 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2111 uschar *s = Ustrchr(h->text, ':') + 1;
2112 while (isspace(*s)) s++;
2114 parse_allow_group = TRUE; /* Allow address group syntax */
2118 uschar *ss = parse_find_address_end(s, FALSE);
2119 uschar *recipient, *errmess, *p, *pp;
2120 int start, end, domain;
2122 /* Check on maximum */
2124 if (recipients_max > 0 && ++rcount > recipients_max)
2126 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2127 US"message rejected: ", error_rc, stdin, NULL);
2128 /* Does not return */
2131 /* Make a copy of the address, and remove any internal newlines. These
2132 may be present as a result of continuations of the header line. The
2133 white space that follows the newline must not be removed - it is part
2136 pp = recipient = store_get(ss - s + 1);
2137 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2139 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2142 /* Keep a list of all the bad addresses so we can send a single
2143 error message at the end. However, an empty address is not an error;
2144 just ignore it. This can come from an empty group list like
2146 To: Recipients of list:;
2148 If there are no recipients at all, an error will occur later. */
2150 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2152 int len = Ustrlen(s);
2153 error_block *b = store_get(sizeof(error_block));
2154 while (len > 0 && isspace(s[len-1])) len--;
2156 b->text1 = string_printing(string_copyn(s, len));
2162 /* If the recipient is already in the nonrecipients tree, it must
2163 have appeared on the command line with the option extract_addresses_
2164 remove_arguments set. Do not add it to the recipients, and keep a note
2165 that this has happened, in order to give a better error if there are
2166 no recipients left. */
2168 else if (recipient != NULL)
2170 if (tree_search(tree_nonrecipients, recipient) == NULL)
2171 receive_add_recipient(recipient, -1);
2173 extracted_ignored = TRUE;
2176 /* Move on past this address */
2178 s = ss + (*ss? 1:0);
2179 while (isspace(*s)) s++;
2180 } /* Next address */
2182 parse_allow_group = FALSE; /* Reset group syntax flags */
2183 parse_found_group = FALSE;
2185 /* If this was the bcc: header, mark it "old", which means it
2186 will be kept on the spool, but not transmitted as part of the
2189 if (h->type == htype_bcc) h->type = htype_old;
2190 } /* For appropriate header line */
2191 } /* For each header line */
2195 /* Now build the unique message id. This has changed several times over the
2196 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2197 Retaining all the history in the comment has become too unwieldy - read
2198 previous release sources if you want it.
2200 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2201 The first part is the current time, in seconds. The second part is the current
2202 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2203 can hold a number in the range 0-3843. It used to be a computed sequence
2204 number, but is now the fractional component of the current time in units of
2205 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2206 received, Exim ensures that the timer has ticked at the appropriate level
2207 before proceeding, to avoid duplication if the pid happened to be re-used
2208 within the same time period. It seems likely that most messages will take at
2209 least half a millisecond to be received, so no delay will normally be
2210 necessary. At least for some time...
2212 There is a modification when localhost_number is set. Formerly this was allowed
2213 to be as large as 255. Now it is restricted to the range 0-16, and the final
2214 component of the message id becomes (localhost_number * 200) + fractional time
2215 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2217 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2218 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2219 still allows the tttttt field to hold a large enough number to last for some
2220 more decades, and the final two-digit field can hold numbers up to 1295, which
2221 is enough for milliseconds (instead of 1/2000 of a second).
2223 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2224 pid, so it is probably safe because pids have to be positive. The
2225 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2226 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2228 Note that string_base62() returns its data in a static storage block, so it
2229 must be copied before calling string_base62() again. It always returns exactly
2232 There doesn't seem to be anything in the RFC which requires a message id to
2233 start with a letter, but Smail was changed to ensure this. The external form of
2234 the message id (as supplied by string expansion) therefore starts with an
2235 additional leading 'E'. The spool file names do not include this leading
2236 letter and it is not used internally.
2238 NOTE: If ever the format of message ids is changed, the regular expression for
2239 checking that a string is in this format must be updated in a corresponding
2240 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2241 must also be changed to reflect the correct string length. Then, of course,
2242 other programs that rely on the message id format will need updating too. */
2244 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2245 message_id[6] = '-';
2246 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2248 /* Deal with the case where the host number is set. The value of the number was
2249 checked when it was read, to ensure it isn't too big. The timing granularity is
2250 left in id_resolution so that an appropriate wait can be done after receiving
2251 the message, if necessary (we hope it won't be). */
2253 if (host_number_string != NULL)
2255 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2256 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2257 string_base62((long int)(
2258 host_number * (1000000/id_resolution) +
2259 message_id_tv.tv_usec/id_resolution)) + 4);
2262 /* Host number not set: final field is just the fractional time at an
2263 appropriate resolution. */
2267 id_resolution = (BASE_62 == 62)? 500 : 1000;
2268 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2269 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2272 /* Add the current message id onto the current process info string if
2275 (void)string_format(process_info + process_info_len,
2276 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2278 /* If we are using multiple input directories, set up the one for this message
2279 to be the least significant base-62 digit of the time of arrival. Otherwise
2280 ensure that it is an empty string. */
2282 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2284 /* Now that we have the message-id, if there is no message-id: header, generate
2285 one, but only for local (without suppress_local_fixups) or submission mode
2286 messages. This can be user-configured if required, but we had better flatten
2287 any illegal characters therein. */
2289 if (msgid_header == NULL &&
2290 ((sender_host_address == NULL && !suppress_local_fixups)
2291 || submission_mode))
2294 uschar *id_text = US"";
2295 uschar *id_domain = primary_hostname;
2297 /* Permit only letters, digits, dots, and hyphens in the domain */
2299 if (message_id_domain != NULL)
2301 uschar *new_id_domain = expand_string(message_id_domain);
2302 if (new_id_domain == NULL)
2304 if (!expand_string_forcedfail)
2305 log_write(0, LOG_MAIN|LOG_PANIC,
2306 "expansion of \"%s\" (message_id_header_domain) "
2307 "failed: %s", message_id_domain, expand_string_message);
2309 else if (*new_id_domain != 0)
2311 id_domain = new_id_domain;
2312 for (p = id_domain; *p != 0; p++)
2313 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2317 /* Permit all characters except controls and RFC 2822 specials in the
2318 additional text part. */
2320 if (message_id_text != NULL)
2322 uschar *new_id_text = expand_string(message_id_text);
2323 if (new_id_text == NULL)
2325 if (!expand_string_forcedfail)
2326 log_write(0, LOG_MAIN|LOG_PANIC,
2327 "expansion of \"%s\" (message_id_header_text) "
2328 "failed: %s", message_id_text, expand_string_message);
2330 else if (*new_id_text != 0)
2332 id_text = new_id_text;
2333 for (p = id_text; *p != 0; p++)
2334 if (mac_iscntrl_or_special(*p)) *p = '-';
2338 /* Add the header line */
2340 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2341 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2344 /* If we are to log recipients, keep a copy of the raw ones before any possible
2345 rewriting. Must copy the count, because later ACLs and the local_scan()
2346 function may mess with the real recipients. */
2348 if ((log_extra_selector & LX_received_recipients) != 0)
2350 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2351 for (i = 0; i < recipients_count; i++)
2352 raw_recipients[i] = string_copy(recipients_list[i].address);
2353 raw_recipients_count = recipients_count;
2356 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2357 recipients will get here only if the conditions were right (allow_unqualified_
2358 recipient is TRUE). */
2360 for (i = 0; i < recipients_count; i++)
2361 recipients_list[i].address =
2362 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2363 global_rewrite_rules, rewrite_existflags);
2365 /* If there is no From: header, generate one for local (without
2366 suppress_local_fixups) or submission_mode messages. If there is no sender
2367 address, but the sender is local or this is a local delivery error, use the
2368 originator login. This shouldn't happen for genuine bounces, but might happen
2369 for autoreplies. The addition of From: must be done *before* checking for the
2370 possible addition of a Sender: header, because untrusted_set_sender allows an
2371 untrusted user to set anything in the envelope (which might then get info
2372 From:) but we still want to ensure a valid Sender: if it is required. */
2374 if (from_header == NULL &&
2375 ((sender_host_address == NULL && !suppress_local_fixups)
2376 || submission_mode))
2378 uschar *oname = US"";
2380 /* Use the originator_name if this is a locally submitted message and the
2381 caller is not trusted. For trusted callers, use it only if -F was used to
2382 force its value or if we have a non-SMTP message for which -f was not used
2383 to set the sender. */
2385 if (sender_host_address == NULL)
2387 if (!trusted_caller || sender_name_forced ||
2388 (!smtp_input && !sender_address_forced))
2389 oname = originator_name;
2392 /* For non-locally submitted messages, the only time we use the originator
2393 name is when it was forced by the /name= option on control=submission. */
2397 if (submission_name != NULL) oname = submission_name;
2400 /* Envelope sender is empty */
2402 if (sender_address[0] == 0)
2404 uschar *fromstart, *fromend;
2406 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2407 oname, (oname[0] == 0)? "" : " <");
2408 fromend = (oname[0] == 0)? US"" : US">";
2410 if (sender_local || local_error_message)
2412 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2413 local_part_quote(originator_login), qualify_domain_sender,
2416 else if (submission_mode && authenticated_id != NULL)
2418 if (submission_domain == NULL)
2420 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2421 local_part_quote(authenticated_id), qualify_domain_sender,
2424 else if (submission_domain[0] == 0) /* empty => whole address set */
2426 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2431 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2432 local_part_quote(authenticated_id), submission_domain,
2435 from_header = header_last; /* To get it checked for Sender: */
2439 /* There is a non-null envelope sender. Build the header using the original
2440 sender address, before any rewriting that might have been done while
2445 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2447 (oname[0] == 0)? "" : " <",
2448 (sender_address_unrewritten == NULL)?
2449 sender_address : sender_address_unrewritten,
2450 (oname[0] == 0)? "" : ">");
2452 from_header = header_last; /* To get it checked for Sender: */
2457 /* If the sender is local (without suppress_local_fixups), or if we are in
2458 submission mode and there is an authenticated_id, check that an existing From:
2459 is correct, and if not, generate a Sender: header, unless disabled. Any
2460 previously-existing Sender: header was removed above. Note that sender_local,
2461 as well as being TRUE if the caller of exim is not trusted, is also true if a
2462 trusted caller did not supply a -f argument for non-smtp input. To allow
2463 trusted callers to forge From: without supplying -f, we have to test explicitly
2464 here. If the From: header contains more than one address, then the call to
2465 parse_extract_address fails, and a Sender: header is inserted, as required. */
2467 if (from_header != NULL &&
2468 (active_local_from_check &&
2469 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2470 (submission_mode && authenticated_id != NULL))
2473 BOOL make_sender = TRUE;
2474 int start, end, domain;
2476 uschar *from_address =
2477 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2478 &start, &end, &domain, FALSE);
2479 uschar *generated_sender_address;
2481 if (submission_mode)
2483 if (submission_domain == NULL)
2485 generated_sender_address = string_sprintf("%s@%s",
2486 local_part_quote(authenticated_id), qualify_domain_sender);
2488 else if (submission_domain[0] == 0) /* empty => full address */
2490 generated_sender_address = string_sprintf("%s",
2495 generated_sender_address = string_sprintf("%s@%s",
2496 local_part_quote(authenticated_id), submission_domain);
2500 generated_sender_address = string_sprintf("%s@%s",
2501 local_part_quote(originator_login), qualify_domain_sender);
2503 /* Remove permitted prefixes and suffixes from the local part of the From:
2504 address before doing the comparison with the generated sender. */
2506 if (from_address != NULL)
2509 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2511 if (at != NULL) *at = 0;
2512 from_address += route_check_prefix(from_address, local_from_prefix);
2513 slen = route_check_suffix(from_address, local_from_suffix);
2516 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2517 from_address += slen;
2519 if (at != NULL) *at = '@';
2521 if (strcmpic(generated_sender_address, from_address) == 0 ||
2522 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2523 make_sender = FALSE;
2526 /* We have to cause the Sender header to be rewritten if there are
2527 appropriate rewriting rules. */
2531 if (submission_mode && submission_name == NULL)
2532 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2533 generated_sender_address);
2535 header_add(htype_sender, "%sSender: %s <%s>\n",
2537 submission_mode? submission_name : originator_name,
2538 generated_sender_address);
2541 /* Ensure that a non-null envelope sender address corresponds to the
2542 submission mode sender address. */
2544 if (submission_mode && sender_address[0] != 0)
2546 if (sender_address_unrewritten == NULL)
2547 sender_address_unrewritten = sender_address;
2548 sender_address = generated_sender_address;
2549 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2550 log_write(L_address_rewrite, LOG_MAIN,
2551 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2552 sender_address_unrewritten, generated_sender_address);
2557 /* If there are any rewriting rules, apply them to the sender address, unless
2558 it has already been rewritten as part of verification for SMTP input. */
2560 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2561 sender_address[0] != 0)
2563 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2564 global_rewrite_rules, rewrite_existflags);
2565 DEBUG(D_receive|D_rewrite)
2566 debug_printf("rewritten sender = %s\n", sender_address);
2570 /* The headers must be run through rewrite_header(), because it ensures that
2571 addresses are fully qualified, as well as applying any rewriting rules that may
2574 Qualification of header addresses in a message from a remote host happens only
2575 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2576 appropriate. For local messages, qualification always happens, unless -bnq is
2577 used to explicitly suppress it. No rewriting is done for an unqualified address
2578 that is left untouched.
2580 We start at the second header, skipping our own Received:. This rewriting is
2581 documented as happening *after* recipient addresses are taken from the headers
2582 by the -t command line option. An added Sender: gets rewritten here. */
2584 for (h = header_list->next; h != NULL; h = h->next)
2586 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2587 rewrite_existflags, TRUE);
2588 if (newh != NULL) h = newh;
2592 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2593 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2594 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2595 exists, this applies to the set of resent- headers rather than the normal set.
2597 The requirement for a recipient header has been removed in RFC 2822. At this
2598 point in the code, earlier versions of Exim added a To: header for locally
2599 submitted messages, and an empty Bcc: header for others. In the light of the
2600 changes in RFC 2822, this was dropped in November 2003. */
2603 /* If there is no date header, generate one if the message originates locally
2604 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2605 submission mode flag is set. Messages without Date: are not valid, but it seems
2606 to be more confusing if Exim adds one to all remotely-originated messages. */
2608 if (!date_header_exists &&
2609 ((sender_host_address == NULL && !suppress_local_fixups)
2610 || submission_mode))
2611 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2613 search_tidyup(); /* Free any cached resources */
2615 /* Show the complete set of headers if debugging. Note that the first one (the
2616 new Received:) has not yet been set. */
2620 debug_printf(">>Headers after rewriting and local additions:\n");
2621 for (h = header_list->next; h != NULL; h = h->next)
2622 debug_printf("%c %s", h->type, h->text);
2626 /* The headers are now complete in store. If we are running in filter
2627 testing mode, that is all this function does. Return TRUE if the message
2628 ended with a dot. */
2630 if (filter_test != FTEST_NONE)
2632 process_info[process_info_len] = 0;
2633 return message_ended == END_DOT;
2636 /* Open a new spool file for the data portion of the message. We need
2637 to access it both via a file descriptor and a stream. Try to make the
2638 directory if it isn't there. Note re use of sprintf: spool_directory
2639 is checked on input to be < 200 characters long. */
2641 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2643 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2646 if (errno == ENOENT)
2649 sprintf(CS temp, "input/%s", message_subdir);
2650 if (message_subdir[0] == 0) temp[5] = 0;
2651 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2652 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2655 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2656 spool_name, strerror(errno));
2659 /* Make sure the file's group is the Exim gid, and double-check the mode
2660 because the group setting doesn't always get set automatically. */
2662 (void)fchown(data_fd, exim_uid, exim_gid);
2663 (void)fchmod(data_fd, SPOOL_MODE);
2665 /* We now have data file open. Build a stream for it and lock it. We lock only
2666 the first line of the file (containing the message ID) because otherwise there
2667 are problems when Exim is run under Cygwin (I'm told). See comments in
2668 spool_in.c, where the same locking is done. */
2670 data_file = fdopen(data_fd, "w+");
2671 lock_data.l_type = F_WRLCK;
2672 lock_data.l_whence = SEEK_SET;
2673 lock_data.l_start = 0;
2674 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2676 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2677 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2678 errno, strerror(errno));
2680 /* We have an open, locked data file. Write the message id to it to make it
2681 self-identifying. Then read the remainder of the input of this message and
2682 write it to the data file. If the variable next != NULL, it contains the first
2683 data line (which was read as a header but then turned out not to have the right
2684 format); write it (remembering that it might contain binary zeros). The result
2685 of fwrite() isn't inspected; instead we call ferror() below. */
2687 fprintf(data_file, "%s-D\n", message_id);
2690 uschar *s = next->text;
2691 int len = next->slen;
2692 (void)fwrite(s, 1, len, data_file);
2693 body_linecount++; /* Assumes only 1 line */
2696 /* Note that we might already be at end of file, or the logical end of file
2697 (indicated by '.'), or might have encountered an error while writing the
2698 message id or "next" line. */
2700 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2704 message_ended = read_message_data_smtp(data_file);
2705 receive_linecount++; /* The terminating "." line */
2707 else message_ended = read_message_data(data_file);
2709 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2710 message_linecount += body_linecount;
2712 /* Handle premature termination of SMTP */
2714 if (smtp_input && message_ended == END_EOF)
2716 Uunlink(spool_name); /* Lose data file when closed */
2717 message_id[0] = 0; /* Indicate no message accepted */
2718 smtp_reply = handle_lost_connection(US"");
2720 goto TIDYUP; /* Skip to end of function */
2723 /* Handle message that is too big. Don't use host_or_ident() in the log
2724 message; we want to see the ident value even for non-remote messages. */
2726 if (message_ended == END_SIZE)
2728 Uunlink(spool_name); /* Lose the data file when closed */
2729 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2731 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2732 "message too big: read=%d max=%d",
2734 (sender_fullhost == NULL)? "" : " H=",
2735 (sender_fullhost == NULL)? US"" : sender_fullhost,
2736 (sender_ident == NULL)? "" : " U=",
2737 (sender_ident == NULL)? US"" : sender_ident,
2739 thismessage_size_limit);
2743 smtp_reply = US"552 Message size exceeds maximum permitted";
2744 message_id[0] = 0; /* Indicate no message accepted */
2745 goto TIDYUP; /* Skip to end of function */
2749 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2750 give_local_error(ERRMESS_TOOBIG,
2751 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2752 US"message rejected: ", error_rc, data_file, header_list);
2753 /* Does not return */
2758 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2759 example, there may be some expansion in an ACL that uses a timer.) */
2761 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2763 /* The message body has now been read into the data file. Call fflush() to
2764 empty the buffers in C, and then call fsync() to get the data written out onto
2765 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2766 having to do this). If there was an I/O error on either input or output,
2767 attempt to send an error message, and unlink the spool file. For non-SMTP input
2768 we can then give up. Note that for SMTP input we must swallow the remainder of
2769 the input in cases of output errors, since the far end doesn't expect to see
2770 anything until the terminating dot line is sent. */
2772 if (fflush(data_file) == EOF || ferror(data_file) ||
2773 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2775 uschar *msg_errno = US strerror(errno);
2776 BOOL input_error = (receive_ferror)() != 0;
2777 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2778 input_error? "Input read" : "Spool write",
2780 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2782 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2783 Uunlink(spool_name); /* Lose the data file */
2788 smtp_reply = US"451 Error while reading input data";
2791 smtp_reply = US"451 Error while writing spool file";
2792 receive_swallow_smtp();
2794 message_id[0] = 0; /* Indicate no message accepted */
2795 goto TIDYUP; /* Skip to end of function */
2800 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2801 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2803 /* Does not return */
2808 /* No I/O errors were encountered while writing the data file. */
2810 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2813 /* If there were any bad addresses extracted by -t, or there were no recipients
2814 left after -t, send a message to the sender of this message, or write it to
2815 stderr if the error handling option is set that way. Note that there may
2816 legitimately be no recipients for an SMTP message if they have all been removed
2819 We need to rewind the data file in order to read it. In the case of no
2820 recipients or stderr error writing, throw the data file away afterwards, and
2821 exit. (This can't be SMTP, which always ensures there's at least one
2822 syntactically good recipient address.) */
2824 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2828 if (recipients_count == 0) debug_printf("*** No recipients\n");
2829 if (bad_addresses != NULL)
2831 error_block *eblock = bad_addresses;
2832 debug_printf("*** Bad address(es)\n");
2833 while (eblock != NULL)
2835 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2836 eblock = eblock->next;
2841 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2843 /* If configured to send errors to the sender, but this fails, force
2844 a failure error code. We use a special one for no recipients so that it
2845 can be detected by the autoreply transport. Otherwise error_rc is set to
2846 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2847 it is EXIT_SUCCESS. */
2849 if (error_handling == ERRORS_SENDER)
2851 if (!moan_to_sender(
2852 (bad_addresses == NULL)?
2853 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2854 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2855 bad_addresses, header_list, data_file, FALSE))
2856 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2860 if (bad_addresses == NULL)
2862 if (extracted_ignored)
2863 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2865 fprintf(stderr, "exim: no recipients in message\n");
2869 fprintf(stderr, "exim: invalid address%s",
2870 (bad_addresses->next == NULL)? ":" : "es:\n");
2871 while (bad_addresses != NULL)
2873 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2874 bad_addresses->text2);
2875 bad_addresses = bad_addresses->next;
2880 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2882 Uunlink(spool_name);
2883 (void)fclose(data_file);
2884 exim_exit(error_rc);
2888 /* Data file successfully written. Generate text for the Received: header by
2889 expanding the configured string, and adding a timestamp. By leaving this
2890 operation till now, we ensure that the timestamp is the time that message
2891 reception was completed. However, this is deliberately done before calling the
2892 data ACL and local_scan().
2894 This Received: header may therefore be inspected by the data ACL and by code in
2895 the local_scan() function. When they have run, we update the timestamp to be
2896 the final time of reception.
2898 If there is just one recipient, set up its value in the $received_for variable
2899 for use when we generate the Received: header.
2901 Note: the checking for too many Received: headers is handled by the delivery
2904 timestamp = expand_string(US"${tod_full}");
2905 if (recipients_count == 1) received_for = recipients_list[0].address;
2906 received = expand_string(received_header_text);
2907 received_for = NULL;
2909 if (received == NULL)
2911 Uunlink(spool_name); /* Lose the data file */
2912 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2913 "(received_header_text) failed: %s", string_printing(received_header_text),
2914 expand_string_message);
2917 /* The first element on the header chain is reserved for the Received header,
2918 so all we have to do is fill in the text pointer, and set the type. However, if
2919 the result of the expansion is an empty string, we leave the header marked as
2920 "old" so as to refrain from adding a Received header. */
2922 if (received[0] == 0)
2924 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2925 received_header->type = htype_old;
2929 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2930 received_header->type = htype_received;
2933 received_header->slen = Ustrlen(received_header->text);
2935 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2936 received_header->type, received_header->text);
2938 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2940 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2941 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2943 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2944 now, before running the DATA ACL. */
2946 add_acl_headers(US"MAIL or RCPT");
2948 /* If an ACL is specified for checking things at this stage of reception of a
2949 message, run it, unless all the recipients were removed by "discard" in earlier
2950 ACLs. That is the only case in which recipients_count can be zero at this
2951 stage. Set deliver_datafile to point to the data file so that $message_body and
2952 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2955 deliver_datafile = data_fd;
2958 enable_dollar_recipients = TRUE;
2960 if (recipients_count == 0)
2962 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2966 /* Handle interactive SMTP messages */
2968 if (smtp_input && !smtp_batched_input)
2971 #ifndef DISABLE_DKIM
2972 if (!dkim_disable_verify)
2974 /* Finish verification, this will log individual signature results to
2976 dkim_exim_verify_finish();
2978 /* Check if we must run the DKIM ACL */
2979 if ((acl_smtp_dkim != NULL) &&
2980 (dkim_verify_signers != NULL) &&
2981 (dkim_verify_signers[0] != '\0'))
2983 uschar *dkim_verify_signers_expanded =
2984 expand_string(dkim_verify_signers);
2985 if (dkim_verify_signers_expanded == NULL)
2987 log_write(0, LOG_MAIN|LOG_PANIC,
2988 "expansion of dkim_verify_signers option failed: %s",
2989 expand_string_message);
2994 uschar *ptr = dkim_verify_signers_expanded;
2995 uschar *item = NULL;
2996 uschar *seen_items = NULL;
2997 int seen_items_size = 0;
2998 int seen_items_offset = 0;
2999 uschar itembuf[256];
3000 while ((item = string_nextinlist(&ptr, &sep,
3002 sizeof(itembuf))) != NULL)
3004 /* Prevent running ACL for an empty item */
3005 if (!item || (item[0] == '\0')) continue;
3006 /* Only run ACL once for each domain or identity, no matter how often it
3007 appears in the expanded list. */
3008 if (seen_items != NULL)
3010 uschar *seen_items_list = seen_items;
3011 if (match_isinlist(item,
3012 &seen_items_list,0,NULL,NULL,MCL_STRING,TRUE,NULL) == OK)
3015 debug_printf("acl_smtp_dkim: skipping signer %s, already seen\n", item);
3018 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,":");
3021 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,item);
3022 seen_items[seen_items_offset] = '\0';
3025 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n", item);
3027 dkim_exim_acl_setup(item);
3028 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, &user_msg, &log_msg);
3033 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, skipping remaining items\n", rc, item);
3037 add_acl_headers(US"DKIM");
3040 recipients_count = 0;
3041 blackholed_by = US"DKIM ACL";
3042 if (log_msg != NULL)
3043 blackhole_log_msg = string_sprintf(": %s", log_msg);
3047 Uunlink(spool_name);
3048 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3049 smtp_yield = FALSE; /* No more messsages after dropped connection */
3050 smtp_reply = US""; /* Indicate reply already sent */
3051 message_id[0] = 0; /* Indicate no message accepted */
3052 goto TIDYUP; /* Skip to end of function */
3057 #endif /* DISABLE_DKIM */
3059 #ifdef WITH_CONTENT_SCAN
3060 if (recipients_count > 0 &&
3061 acl_smtp_mime != NULL &&
3062 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3064 #endif /* WITH_CONTENT_SCAN */
3066 /* Check the recipients count again, as the MIME ACL might have changed
3069 if (acl_smtp_data != NULL && recipients_count > 0)
3071 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3072 add_acl_headers(US"DATA");
3075 recipients_count = 0;
3076 blackholed_by = US"DATA ACL";
3077 if (log_msg != NULL)
3078 blackhole_log_msg = string_sprintf(": %s", log_msg);
3082 Uunlink(spool_name);
3083 #ifdef WITH_CONTENT_SCAN
3086 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3087 smtp_yield = FALSE; /* No more messsages after dropped connection */
3088 smtp_reply = US""; /* Indicate reply already sent */
3089 message_id[0] = 0; /* Indicate no message accepted */
3090 goto TIDYUP; /* Skip to end of function */
3095 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3096 we cannot take different actions for permanent and temporary rejections. */
3101 #ifdef WITH_CONTENT_SCAN
3102 if (acl_not_smtp_mime != NULL &&
3103 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3106 #endif /* WITH_CONTENT_SCAN */
3108 if (acl_not_smtp != NULL)
3110 uschar *user_msg, *log_msg;
3111 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3114 recipients_count = 0;
3115 blackholed_by = US"non-SMTP ACL";
3116 if (log_msg != NULL)
3117 blackhole_log_msg = string_sprintf(": %s", log_msg);
3121 Uunlink(spool_name);
3122 #ifdef WITH_CONTENT_SCAN
3125 /* The ACL can specify where rejections are to be logged, possibly
3126 nowhere. The default is main and reject logs. */
3128 if (log_reject_target != 0)
3129 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3130 sender_address, log_msg);
3132 if (user_msg == NULL) user_msg = US"local configuration problem";
3133 if (smtp_batched_input)
3135 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3136 /* Does not return */
3140 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3141 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3142 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3144 /* Does not return */
3147 add_acl_headers(US"non-SMTP");
3151 /* The applicable ACLs have been run */
3153 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3154 if (queue_only_policy) queued_by = US"ACL";
3157 #ifdef WITH_CONTENT_SCAN
3161 #ifdef EXPERIMENTAL_DCC
3166 /* The final check on the message is to run the scan_local() function. The
3167 version supplied with Exim always accepts, but this is a hook for sysadmins to
3168 supply their own checking code. The local_scan() function is run even when all
3169 the recipients have been discarded. */
3171 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3173 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3174 deleted, and the incident gets logged. */
3176 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3177 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3178 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3179 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3181 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3182 local_scan_timeout);
3183 local_scan_data = NULL;
3185 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3186 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3187 rc = local_scan(data_fd, &local_scan_data);
3189 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3191 enable_dollar_recipients = FALSE;
3193 store_pool = POOL_MAIN; /* In case changed */
3194 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3197 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3198 os_non_restarting_signal(SIGFPE, SIG_DFL);
3199 os_non_restarting_signal(SIGILL, SIG_DFL);
3200 os_non_restarting_signal(SIGBUS, SIG_DFL);
3202 /* The length check is paranoia against some runaway code, and also because
3203 (for a success return) lines in the spool file are read into big_buffer. */
3205 if (local_scan_data != NULL)
3207 int len = Ustrlen(local_scan_data);
3208 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3209 local_scan_data = string_copyn(local_scan_data, len);
3212 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3214 if (!deliver_freeze) /* ACL might have already frozen */
3216 deliver_freeze = TRUE;
3217 deliver_frozen_at = time(NULL);
3218 frozen_by = US"local_scan()";
3220 rc = LOCAL_SCAN_ACCEPT;
3222 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3224 if (!queue_only_policy) /* ACL might have already queued */
3226 queue_only_policy = TRUE;
3227 queued_by = US"local_scan()";
3229 rc = LOCAL_SCAN_ACCEPT;
3232 /* Message accepted: remove newlines in local_scan_data because otherwise
3233 the spool file gets corrupted. Ensure that all recipients are qualified. */
3235 if (rc == LOCAL_SCAN_ACCEPT)
3237 if (local_scan_data != NULL)
3240 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3242 for (i = 0; i < recipients_count; i++)
3244 recipient_item *r = recipients_list + i;
3245 r->address = rewrite_address_qualify(r->address, TRUE);
3246 if (r->errors_to != NULL)
3247 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3249 if (recipients_count == 0 && blackholed_by == NULL)
3250 blackholed_by = US"local_scan";
3253 /* Message rejected: newlines permitted in local_scan_data to generate
3254 multiline SMTP responses. */
3258 uschar *istemp = US"";
3264 errmsg = local_scan_data;
3266 Uunlink(spool_name); /* Cancel this message */
3270 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3271 "rejection given", rc);
3274 case LOCAL_SCAN_REJECT_NOLOGHDR:
3275 log_extra_selector &= ~LX_rejected_header;
3278 case LOCAL_SCAN_REJECT:
3279 smtp_code = US"550";
3280 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3283 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3284 log_extra_selector &= ~LX_rejected_header;
3287 case LOCAL_SCAN_TEMPREJECT:
3289 smtp_code = US"451";
3290 if (errmsg == NULL) errmsg = US"Temporary local problem";
3291 istemp = US"temporarily ";
3295 s = string_append(s, &size, &sptr, 2, US"F=",
3296 (sender_address[0] == 0)? US"<>" : sender_address);
3297 s = add_host_info_for_log(s, &size, &sptr);
3300 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3301 s, istemp, string_printing(errmsg));
3305 if (!smtp_batched_input)
3307 smtp_respond(smtp_code, 3, TRUE, errmsg);
3308 message_id[0] = 0; /* Indicate no message accepted */
3309 smtp_reply = US""; /* Indicate reply already sent */
3310 goto TIDYUP; /* Skip to end of function */
3314 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3315 /* Does not return */
3320 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3321 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3322 US"message rejected by local scan code: ", error_rc, data_file,
3324 /* Does not return */
3328 /* Reset signal handlers to ignore signals that previously would have caused
3329 the message to be abandoned. */
3331 signal(SIGTERM, SIG_IGN);
3332 signal(SIGINT, SIG_IGN);
3334 /* Ensure the first time flag is set in the newly-received message. */
3336 deliver_firsttime = TRUE;
3338 #ifdef EXPERIMENTAL_BRIGHTMAIL
3340 /* rewind data file */
3341 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3342 bmi_verdicts = bmi_process_message(header_list, data_fd);
3346 /* Update the timstamp in our Received: header to account for any time taken by
3347 an ACL or by local_scan(). The new time is the time that all reception
3348 processing is complete. */
3350 timestamp = expand_string(US"${tod_full}");
3351 tslen = Ustrlen(timestamp);
3353 memcpy(received_header->text + received_header->slen - tslen - 1,
3356 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3360 deliver_freeze = FALSE;
3361 queue_only_policy = FALSE;
3364 /* Keep the data file open until we have written the header file, in order to
3365 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3366 don't write the header file, and we unlink the data file. If writing the header
3367 file fails, we have failed to accept this message. */
3369 if (host_checking || blackholed_by != NULL)
3372 Uunlink(spool_name);
3373 msg_size = 0; /* Compute size for log line */
3374 for (h = header_list; h != NULL; h = h->next)
3375 if (h->type != '*') msg_size += h->slen;
3378 /* Write the -H file */
3382 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3384 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3385 Uunlink(spool_name); /* Lose the data file */
3389 smtp_reply = US"451 Error in writing spool file";
3390 message_id[0] = 0; /* Indicate no message accepted */
3395 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3396 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3398 /* Does not return */
3404 /* The message has now been successfully received. */
3406 receive_messagecount++;
3408 /* In SMTP sessions we may receive several in one connection. After each one,
3409 we wait for the clock to tick at the level of message-id granularity. This is
3410 so that the combination of time+pid is unique, even on systems where the pid
3411 can be re-used within our time interval. We can't shorten the interval without
3412 re-designing the message-id. See comments above where the message id is
3413 created. This is Something For The Future. */
3415 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3416 exim_wait_tick(&message_id_tv, id_resolution);
3418 /* Add data size to written header size. We do not count the initial file name
3419 that is in the file, but we do add one extra for the notional blank line that
3420 precedes the data. This total differs from message_size in that it include the
3421 added Received: header and any other headers that got created locally. */
3424 fstat(data_fd, &statbuf);
3426 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3428 /* Generate a "message received" log entry. We do this by building up a dynamic
3429 string as required. Since we commonly want to add two items at a time, use a
3430 macro to simplify the coding. We log the arrival of a new message while the
3431 file is still locked, just in case the machine is *really* fast, and delivers
3432 it first! Include any message id that is in the message - since the syntax of a
3433 message id is actually an addr-spec, we can use the parse routine to canonicize
3438 s = store_get(size);
3440 s = string_append(s, &size, &sptr, 2, US"<= ",
3441 (sender_address[0] == 0)? US"<>" : sender_address);
3442 if (message_reference != NULL)
3443 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3445 s = add_host_info_for_log(s, &size, &sptr);
3448 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3449 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3450 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3452 s = string_append(s, &size, &sptr, 2, US" CV=",
3453 tls_certificate_verified? "yes":"no");
3454 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3455 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3456 string_printing(tls_peerdn), US"\"");
3459 if (sender_host_authenticated != NULL)
3461 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3462 if (authenticated_id != NULL)
3463 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3466 sprintf(CS big_buffer, "%d", msg_size);
3467 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3469 /* If an addr-spec in a message-id contains a quoted string, it can contain
3470 any characters except " \ and CR and so in particular it can contain NL!
3471 Therefore, make sure we use a printing-characters only version for the log.
3472 Also, allow for domain literals in the message id. */
3474 if (msgid_header != NULL)
3477 BOOL save_allow_domain_literals = allow_domain_literals;
3478 allow_domain_literals = TRUE;
3479 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3480 &errmsg, &start, &end, &domain, FALSE);
3481 allow_domain_literals = save_allow_domain_literals;
3483 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3486 /* If subject logging is turned on, create suitable printing-character
3487 text. By expanding $h_subject: we make use of the MIME decoding. */
3489 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3492 uschar *p = big_buffer;
3493 uschar *ss = expand_string(US"$h_subject:");
3495 /* Backslash-quote any double quotes or backslashes so as to make a
3496 a C-like string, and turn any non-printers into escape sequences. */
3499 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3501 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3506 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3509 /* Terminate the string: string_cat() and string_append() leave room, but do
3510 not put the zero in. */
3514 /* Create a message log file if message logs are being used and this message is
3515 not blackholed. Write the reception stuff to it. We used to leave message log
3516 creation until the first delivery, but this has proved confusing for somep
3519 if (message_logs && blackholed_by == NULL)
3523 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3525 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3527 if (fd < 0 && errno == ENOENT)
3530 sprintf(CS temp, "msglog/%s", message_subdir);
3531 if (message_subdir[0] == 0) temp[6] = 0;
3532 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3533 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3538 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3539 spool_name, strerror(errno));
3544 FILE *message_log = fdopen(fd, "a");
3545 if (message_log == NULL)
3547 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3548 spool_name, strerror(errno));
3553 uschar *now = tod_stamp(tod_log);
3554 fprintf(message_log, "%s Received from %s\n", now, s+3);
3555 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3557 if (queue_only_policy) fprintf(message_log,
3558 "%s no immediate delivery: queued by %s\n", now, queued_by);
3559 (void)fclose(message_log);
3564 /* Everything has now been done for a successful message except logging its
3565 arrival, and outputting an SMTP response. While writing to the log, set a flag
3566 to cause a call to receive_bomb_out() if the log cannot be opened. */
3568 receive_call_bombout = TRUE;
3570 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3571 connection has gone away. This can only be done if there is no unconsumed input
3572 waiting in the local input buffer. We can test for this by calling
3573 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3574 input to be sent following the final dot, so the presence of following input is
3577 If the connection is still present, but there is no unread input for the
3578 socket, the result of a select() call will be zero. If, however, the connection
3579 has gone away, or if there is pending input, the result of select() will be
3580 non-zero. The two cases can be distinguished by trying to read the next input
3581 character. If we succeed, we can unread it so that it remains in the local
3582 buffer for handling later. If not, the connection has been lost.
3584 Of course, since TCP/IP is asynchronous, there is always a chance that the
3585 connection will vanish between the time of this test and the sending of the
3586 response, but the chance of this happening should be small. */
3588 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3589 !receive_smtp_buffered())
3592 fd_set select_check;
3593 FD_ZERO(&select_check);
3594 FD_SET(fileno(smtp_in), &select_check);
3598 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3600 int c = (receive_getc)();
3601 if (c != EOF) (receive_ungetc)(c); else
3603 uschar *msg = US"SMTP connection lost after final dot";
3604 smtp_reply = US""; /* No attempt to send a response */
3605 smtp_yield = FALSE; /* Nothing more on this connection */
3607 /* Re-use the log line workspace */
3610 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3611 s = add_host_info_for_log(s, &size, &sptr);
3613 log_write(0, LOG_MAIN, "%s", s);
3615 /* Delete the files for this aborted message. */
3617 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3618 message_subdir, message_id);
3619 Uunlink(spool_name);
3621 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3622 message_subdir, message_id);
3623 Uunlink(spool_name);
3625 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3626 message_subdir, message_id);
3627 Uunlink(spool_name);
3634 /* The connection has not gone away; we really are going to take responsibility
3635 for this message. */
3637 log_write(0, LOG_MAIN |
3638 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3639 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3641 receive_call_bombout = FALSE;
3643 /* Log any control actions taken by an ACL or local_scan(). */
3645 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3646 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3647 "no immediate delivery: queued by %s", queued_by);
3649 store_reset(s); /* The store for the main log message can be reused */
3651 /* If the message is frozen, and freeze_tell is set, do the telling. */
3653 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3655 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3656 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3657 message_id, frozen_by, sender_address);
3661 /* Either a message has been successfully received and written to the two spool
3662 files, or an error in writing the spool has occurred for an SMTP message, or
3663 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
3664 we will have already given up because there's no point in carrying on!) In
3665 either event, we must now close (and thereby unlock) the data file. In the
3666 successful case, this leaves the message on the spool, ready for delivery. In
3667 the error case, the spool file will be deleted. Then tidy up store, interact
3668 with an SMTP call if necessary, and return.
3670 A fflush() was done earlier in the expectation that any write errors on the
3671 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3672 possible for fclose() to fail - but what to do? What has happened to the lock
3676 process_info[process_info_len] = 0; /* Remove message id */
3677 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
3679 /* Now reset signal handlers to their defaults */
3681 signal(SIGTERM, SIG_DFL);
3682 signal(SIGINT, SIG_DFL);
3684 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3685 value, which defaults TRUE - meaning there may be more incoming messages from
3686 this connection. For non-SMTP callers (where there is only ever one message),
3687 the default is FALSE. */
3693 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3694 is set to the response that should be sent. When it is NULL, we generate
3695 default responses. After an ACL error or local_scan() error, the response has
3696 already been sent, and smtp_reply is an empty string to indicate this. */
3698 if (!smtp_batched_input)
3700 if (smtp_reply == NULL)
3702 if (fake_response != OK)
3703 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
3704 fake_response_text);
3706 /* An OK response is required; use "message" text if present. */
3708 else if (user_msg != NULL)
3710 uschar *code = US"250";
3712 smtp_message_code(&code, &len, &user_msg, NULL);
3713 smtp_respond(code, len, TRUE, user_msg);
3716 /* Default OK response */
3719 smtp_printf("250 OK id=%s\r\n", message_id);
3722 "\n**** SMTP testing: that is not a real message id!\n\n");
3725 /* smtp_reply is set non-empty */
3727 else if (smtp_reply[0] != 0)
3729 if (fake_response != OK && (smtp_reply[0] == '2'))
3730 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
3731 fake_response_text);
3733 smtp_printf("%.1024s\r\n", smtp_reply);
3737 /* For batched SMTP, generate an error message on failure, and do
3738 nothing on success. The function moan_smtp_batch() does not return -
3739 it exits from the program with a non-zero return code. */
3741 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
3745 /* If blackholing, we can immediately log this message's sad fate. The data
3746 file has already been unlinked, and the header file was never written to disk.
3747 We must now indicate that nothing was received, to prevent a delivery from
3750 if (blackholed_by != NULL)
3752 uschar *detail = (local_scan_data != NULL)?
3753 string_printing(local_scan_data) :
3754 string_sprintf("(%s discarded recipients)", blackholed_by);
3755 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
3756 log_write(0, LOG_MAIN, "Completed");
3760 /* Reset headers so that logging of rejects for a subsequent message doesn't
3761 include them. It is also important to set header_last = NULL before exiting
3762 from this function, as this prevents certain rewrites that might happen during
3763 subsequent verifying (of another incoming message) from trying to add headers
3764 when they shouldn't. */
3766 header_list = header_last = NULL;
3768 return yield; /* TRUE if more messages (SMTP only) */
3771 /* End of receive.c */