1 /* $Cambridge: exim/src/src/receive.c,v 1.4.2.2 2004/12/02 16:33:30 tom Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2004 */
8 /* See the file NOTICE for conditions of use and distribution. */
10 /* Code for receiving a message and setting up spool files. */
17 /*************************************************
18 * Local static variables *
19 *************************************************/
21 static FILE *data_file = NULL;
22 static int data_fd = -1;
23 static uschar spool_name[256];
27 /*************************************************
28 * Non-SMTP character reading functions *
29 *************************************************/
31 /* These are the default functions that are set up in the variables such as
32 receive_getc initially. They just call the standard functions, passing stdin as
33 the file. (When SMTP input is occurring, different functions are used by
34 changing the pointer variables.) */
45 return ungetc(c, stdin);
63 /*************************************************
64 * Check that a set sender is allowed *
65 *************************************************/
67 /* This function is called when a local caller sets an explicit sender address.
68 It checks whether this is permitted, which it is for trusted callers.
69 Otherwise, it must match the pattern(s) in untrusted_set_sender.
71 Arguments: the proposed sender address
72 Returns: TRUE for a trusted caller
73 TRUE if the address has been set, untrusted_set_sender has been
74 set, and the address matches something in the list
79 receive_check_set_sender(uschar *newsender)
82 if (trusted_caller) return TRUE;
83 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
84 qnewsender = (Ustrchr(newsender, '@') != NULL)?
85 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
87 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
94 /*************************************************
95 * Read space info for a partition *
96 *************************************************/
98 /* This function is called by receive_check_fs() below, and also by string
99 expansion for variables such as $spool_space. The field names for the statvfs
100 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
101 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
102 have inodes, and they return -1 for the number available.
104 Later: It turns out that some file systems that do not have the concept of
105 inodes return 0 rather than -1. Such systems should also return 0 for the total
106 number of inodes, so we require that to be greater than zero before returning
110 isspool TRUE for spool partition, FALSE for log partition
111 inodeptr address of int to receive inode count; -1 if there isn't one
113 Returns: available on-root space, in kilobytes
114 -1 for log partition if there isn't one
116 All values are -1 if the STATFS functions are not available.
120 receive_statvfs(BOOL isspool, int *inodeptr)
123 struct STATVFS statbuf;
128 /* The spool directory must always exist. */
132 path = spool_directory;
136 /* Need to cut down the log file path to the directory, and to ignore any
137 appearance of "syslog" in it. */
141 int sep = ':'; /* Not variable - outside scripts use */
142 uschar *p = log_file_path;
145 /* An empty log_file_path means "use the default". This is the same as an
146 empty item in a list. */
148 if (*p == 0) p = US":";
149 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
151 if (Ustrcmp(path, "syslog") != 0) break;
154 if (path == NULL) /* No log files */
160 /* An empty string means use the default, which is in the spool directory.
161 But don't just use the spool directory, as it is possible that the log
162 subdirectory has been symbolically linked elsewhere. */
166 sprintf(CS buffer, CS"%s/log", CS spool_directory);
172 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
176 /* We now have the patch; do the business */
178 memset(&statbuf, 0, sizeof(statbuf));
180 if (STATVFS(CS path, &statbuf) != 0)
182 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
183 "%s directory %s: %s", name, spool_directory, strerror(errno));
184 smtp_closedown(US"spool or log directory problem");
185 exim_exit(EXIT_FAILURE);
188 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
190 /* Disks are getting huge. Take care with computing the size in kilobytes. */
192 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
194 /* Unable to find partition sizes in this environment. */
205 /*************************************************
206 * Check space on spool and log partitions *
207 *************************************************/
209 /* This function is called before accepting a message; if any thresholds are
210 set, it checks them. If a message_size is supplied, it checks that there is
211 enough space for that size plus the threshold - i.e. that the message won't
212 reduce the space to the threshold. Not all OS have statvfs(); for those that
213 don't, this function always returns TRUE. For some OS the old function and
214 struct name statfs is used; that is handled by a macro, defined in exim.h.
217 msg_size the (estimated) size of an incoming message
219 Returns: FALSE if there isn't enough space, or if the information cannot
221 TRUE if no check was done or there is enough space
225 receive_check_fs(int msg_size)
229 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
231 space = receive_statvfs(TRUE, &inodes);
234 debug_printf("spool directory space = %dK inodes = %d "
235 "check_space = %dK inodes = %d msg_size = %d\n",
236 space, inodes, check_spool_space, check_spool_inodes, msg_size);
238 if ((space >= 0 && space < check_spool_space) ||
239 (inodes >= 0 && inodes < check_spool_inodes))
241 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
242 "inodes=%d", space, inodes);
247 if (check_log_space > 0 || check_log_inodes > 0)
249 space = receive_statvfs(FALSE, &inodes);
252 debug_printf("log directory space = %dK inodes = %d "
253 "check_space = %dK inodes = %d\n",
254 space, inodes, check_log_space, check_log_inodes);
256 if ((space >= 0 && space < check_log_space) ||
257 (inodes >= 0 && inodes < check_log_inodes))
259 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
260 "inodes=%d", space, inodes);
270 /*************************************************
271 * Bomb out while reading a message *
272 *************************************************/
274 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
275 received, or if there is a timeout. A rarer case might be if the log files are
276 screwed up and Exim can't open them to record a message's arrival. Handling
277 that case is done by setting a flag to cause the log functions to call this
278 function if there is an ultimate disaster. That is why it is globally
281 Arguments: SMTP response to give if in an SMTP session
286 receive_bomb_out(uschar *msg)
288 /* If spool_name is set, it contains the name of the data file that is being
289 written. Unlink it before closing so that it cannot be picked up by a delivery
290 process. Ensure that any header file is also removed. */
292 if (spool_name[0] != 0)
295 spool_name[Ustrlen(spool_name) - 1] = 'H';
299 /* Now close the file if it is open, either as a fd or a stream. */
301 if (data_file != NULL) fclose(data_file);
302 else if (data_fd >= 0) close(data_fd);
304 /* Attempt to close down an SMTP connection tidily. */
308 if (!smtp_batched_input)
310 smtp_printf("421 %s %s - closing connection.\r\n", smtp_active_hostname,
315 /* Control does not return from moan_smtp_batch(). */
317 else moan_smtp_batch(NULL, "421 %s - message abandoned", msg);
320 /* Exit from the program (non-BSMTP cases) */
322 exim_exit(EXIT_FAILURE);
326 /*************************************************
327 * Data read timeout *
328 *************************************************/
330 /* Handler function for timeouts that occur while reading the data that
333 Argument: the signal number
338 data_timeout_handler(int sig)
342 sig = sig; /* Keep picky compilers happy */
346 msg = US"SMTP incoming data timeout";
347 log_write(L_lost_incoming_connection,
348 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
350 (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(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 receive_bomb_out(US"local verification problem"); /* Does not return */
386 /*************************************************
387 * local_scan() crashed *
388 *************************************************/
390 /* Handler function for signals that occur while running a local_scan()
393 Argument: the signal number
398 local_scan_crash_handler(int sig)
400 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
401 "signal %d - message temporarily rejected (size %d)", sig, message_size);
402 receive_bomb_out(US"local verification problem"); /* Does not return */
406 /*************************************************
407 * SIGTERM or SIGINT received *
408 *************************************************/
410 /* Handler for SIGTERM or SIGINT signals that occur while reading the
411 data that comprises a message.
413 Argument: the signal number
418 data_sigterm_sigint_handler(int sig)
424 msg = US"Service not available - SIGTERM or SIGINT received";
425 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
426 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
430 if (filter_test == NULL)
432 fprintf(stderr, "\nexim: %s received - message abandoned\n",
433 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
434 log_write(0, LOG_MAIN, "%s received while reading local message",
435 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
439 receive_bomb_out(msg); /* Does not return */
444 /*************************************************
445 * Add new recipient to list *
446 *************************************************/
448 /* This function builds a list of recipient addresses in argc/argv
452 recipient the next address to add to recipients_list
453 pno parent number for fixed aliases; -1 otherwise
459 receive_add_recipient(uschar *recipient, int pno)
461 if (recipients_count >= recipients_list_max)
463 recipient_item *oldlist = recipients_list;
464 int oldmax = recipients_list_max;
465 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
466 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
468 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
471 recipients_list[recipients_count].address = recipient;
472 recipients_list[recipients_count].pno = pno;
473 recipients_list[recipients_count++].errors_to = NULL;
479 /*************************************************
480 * Remove a recipient from the list *
481 *************************************************/
483 /* This function is provided for local_scan() to use.
486 recipient address to remove
488 Returns: TRUE if it did remove something; FALSE otherwise
492 receive_remove_recipient(uschar *recipient)
495 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
497 for (count = 0; count < recipients_count; count++)
499 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
501 if ((--recipients_count - count) > 0)
502 memmove(recipients_list + count, recipients_list + count + 1,
503 (recipients_count - count)*sizeof(recipient_item));
514 /*************************************************
515 * Read data portion of a non-SMTP message *
516 *************************************************/
518 /* This function is called to read the remainder of a message (following the
519 header) when the input is not from SMTP - we are receiving a local message on
520 a standard input stream. The message is always terminated by EOF, and is also
521 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
522 two cases for maximum efficiency.
524 Ensure that the body ends with a newline. This will naturally be the case when
525 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
526 as "sequences of lines" - this of course strictly applies only to SMTP, but
527 deliveries into BSD-type mailbox files also require it. Exim used to have a
528 flag for doing this at delivery time, but as it was always set for all
529 transports, I decided to simplify things by putting the check here instead.
531 There is at least one MUA (dtmail) that sends CRLF via this interface, and
532 other programs are known to do this as well. Exim used to have a option for
533 dealing with this: in July 2003, after much discussion, the code has been
534 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
536 However, for the case when a dot on a line by itself terminates a message, the
537 only recognized terminating sequences before and after the dot are LF and CRLF.
538 Otherwise, having read EOL . CR, you don't know whether to read another
541 Internally, in messages stored in Exim's spool files, LF is used as the line
542 terminator. Under the new regime, bare CRs will no longer appear in these
546 fout a FILE to which to write the message
548 Returns: One of the END_xxx values indicating why it stopped reading
552 read_message_data(FILE *fout)
557 /* Handle the case when only EOF terminates the message */
561 register int last_ch = '\n';
563 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
565 if (ch == 0) body_zerocount++;
566 if (last_ch == '\r' && ch != '\n')
568 if (fputc('\n', fout) == EOF) return END_WERROR;
572 if (ch == '\r') continue;
574 if (fputc(ch, fout) == EOF) return END_WERROR;
575 if (ch == '\n') body_linecount++;
576 if (++message_size > thismessage_size_limit) return END_SIZE;
581 if (fputc('\n', fout) == EOF) return END_WERROR;
589 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
593 while ((ch = (receive_getc)()) != EOF)
595 if (ch == 0) body_zerocount++;
598 case 0: /* Normal state (previous char written) */
600 { body_linecount++; ch_state = 1; }
602 { ch_state = 2; continue; }
605 case 1: /* After written "\n" */
606 if (ch == '.') { ch_state = 3; continue; }
607 if (ch != '\n') ch_state = 0;
611 body_linecount++; /* After unwritten "\r" */
616 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
617 if (ch == '\r') continue;
622 case 3: /* After "\n." (\n written, dot not) */
623 if (ch == '\n') return END_DOT;
624 if (ch == '\r') { ch_state = 4; continue; }
626 if (fputc('.', fout) == EOF) return END_WERROR;
630 case 4: /* After "\n.\r" (\n written, rest not) */
631 if (ch == '\n') return END_DOT;
634 if (fputs(".\n", fout) == EOF) return END_WERROR;
635 if (ch == '\r') { ch_state = 2; continue; }
640 if (fputc(ch, fout) == EOF) return END_WERROR;
641 if (++message_size > thismessage_size_limit) return END_SIZE;
644 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
645 the message ends with a newline, and we must also write any characters that
646 were saved up while testing for an ending dot. */
650 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
651 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
652 message_size += Ustrlen(ends[ch_state]);
662 /*************************************************
663 * Read data portion of an SMTP message *
664 *************************************************/
666 /* This function is called to read the remainder of an SMTP message (after the
667 headers), or to skip over it when an error has occurred. In this case, the
668 output file is passed as NULL.
670 If any line begins with a dot, that character is skipped. The input should only
671 be successfully terminated by CR LF . CR LF unless it is local (non-network)
672 SMTP, in which case the CRs are optional, but...
674 FUDGE: It seems that sites on the net send out messages with just LF
675 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
676 we make the CRs optional in all cases.
678 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
679 well, so that there are no CRs in spooled messages. However, the message
680 terminating dot is not recognized between two bare CRs.
683 fout a FILE to which to write the message; NULL if skipping
685 Returns: One of the END_xxx values indicating why it stopped reading
689 read_message_data_smtp(FILE *fout)
694 while ((ch = (receive_getc)()) != EOF)
696 if (ch == 0) body_zerocount++;
699 case 0: /* After LF or CRLF */
703 continue; /* Don't ever write . after LF */
707 /* Else fall through to handle as normal uschar. */
709 case 1: /* Normal state */
722 case 2: /* After (unwritten) CR */
731 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
732 if (ch != '\r') ch_state = 1; else continue;
736 case 3: /* After [CR] LF . */
744 ch_state = 1; /* The dot itself is removed */
747 case 4: /* After [CR] LF . CR */
748 if (ch == '\n') return END_DOT;
751 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
761 /* Add the character to the spool file, unless skipping; then loop for the
767 if (fputc(ch, fout) == EOF) return END_WERROR;
768 if (message_size > thismessage_size_limit) return END_SIZE;
772 /* Fall through here if EOF encountered. This indicates some kind of error,
773 since a correct message is terminated by [CR] LF . [CR] LF. */
781 /*************************************************
782 * Swallow SMTP message *
783 *************************************************/
785 /* This function is called when there has been some kind of error while reading
786 an SMTP message, and the remaining data may need to be swallowed. It is global
787 because it is called from smtp_closedown() to shut down an incoming call
790 Argument: a FILE from which to read the message
795 receive_swallow_smtp(void)
797 if (message_ended >= END_NOTENDED)
798 message_ended = read_message_data_smtp(NULL);
803 /*************************************************
804 * Handle lost SMTP connection *
805 *************************************************/
807 /* This function logs connection loss incidents and generates an appropriate
810 Argument: additional data for the message
811 Returns: the SMTP response
815 handle_lost_connection(uschar *s)
817 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
818 "%s lost while reading message data%s", smtp_get_connection_info(), s);
819 return US"421 Lost incoming connection";
825 /*************************************************
826 * Handle a non-smtp reception error *
827 *************************************************/
829 /* This function is called for various errors during the reception of non-SMTP
830 messages. It either sends a message to the sender of the problem message, or it
831 writes to the standard error stream.
834 errcode code for moan_to_sender(), identifying the error
835 text1 first message text, passed to moan_to_sender()
836 text2 second message text, used only for stderrr
837 error_rc code to pass to exim_exit if no problem
838 f FILE containing body of message (may be stdin)
839 hptr pointer to instore headers or NULL
841 Returns: calls exim_exit(), which does not return
845 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
846 FILE *f, header_line *hptr)
848 if (error_handling == ERRORS_SENDER)
852 eblock.text1 = text1;
853 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
854 error_rc = EXIT_FAILURE;
856 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
863 /*************************************************
864 * Add header lines set up by ACL *
865 *************************************************/
867 /* This function is called to add the header lines that were set up by "warn"
868 statements in an ACL onto the list of headers in memory. It is done in two
869 stages like this, because when the ACL for RCPT is running, the other headers
870 have not yet been received. This function is called twice; once just before
871 running the DATA ACL, and once after. This is so that header lines added by
872 MAIL or RCPT are visible to the DATA ACL.
874 Originally these header lines were added at the end. Now there is support for
875 three different places: top, bottom, and after the Received: header(s). There
876 will always be at least one Received: header, even if it is marked deleted, and
877 even if something else has been put in front of it.
880 acl_name text to identify which ACL
886 add_acl_headers(uschar *acl_name)
888 header_line *h, *next;
889 header_line *last_received = NULL;
891 if (acl_warn_headers == NULL) return;
892 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
894 for (h = acl_warn_headers; h != NULL; h = next)
901 h->next = header_list;
903 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
907 if (last_received == NULL)
909 last_received = header_list;
910 while (!header_testname(last_received, US"Received", 8, FALSE))
911 last_received = last_received->next;
912 while (last_received->next != NULL &&
913 header_testname(last_received->next, US"Received", 8, FALSE))
914 last_received = last_received->next;
916 h->next = last_received->next;
917 last_received->next = h;
918 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
922 /* add header before any header which is NOT Received: or Resent- */
923 last_received = header_list;
924 while ( (last_received->next != NULL) &&
925 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
926 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
927 last_received = last_received->next;
928 /* last_received now points to the last Received: or Resent-* header
929 in an uninterrupted chain of those header types (seen from the beginning
930 of all headers. Our current header must follow it. */
931 h->next = last_received->next;
932 last_received->next = h;
933 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
938 header_last->next = h;
942 if (h->next == NULL) header_last = h;
944 /* Check for one of the known header types (From:, To:, etc.) though in
945 practice most added headers are going to be "other". Lower case
946 identification letters are never stored with the header; they are used
947 for existence tests when messages are received. So discard any lower case
950 h->type = header_checkname(h, FALSE);
951 if (h->type >= 'a') h->type = htype_other;
953 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
956 acl_warn_headers = NULL;
957 DEBUG(D_receive|D_acl) debug_printf(">>\n");
962 /*************************************************
963 * Add host information for log line *
964 *************************************************/
966 /* Called for acceptance and rejecting log lines. This adds information about
967 the calling host to a string that is being built dynamically.
971 sizeptr points to the size variable
972 ptrptr points to the pointer variable
974 Returns: the extended string
978 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
980 if (sender_fullhost != NULL)
982 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
983 if ((log_extra_selector & LX_incoming_interface) != 0 &&
984 interface_address != NULL)
986 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
988 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
991 if (sender_ident != NULL)
992 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
993 if (received_protocol != NULL)
994 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1001 /*************************************************
1003 *************************************************/
1005 /* Receive a message on the given input, and put it into a pair of spool files.
1006 Either a non-null list of recipients, or the extract flag will be true, or
1007 both. The flag sender_local is true for locally generated messages. The flag
1008 submission_mode is true if an ACL has obeyed "control = submission". The flag
1009 smtp_input is true if the message is to be handled using SMTP conventions about
1010 termination and lines starting with dots. For non-SMTP messages, dot_ends is
1011 true for dot-terminated messages.
1013 If a message was successfully read, message_id[0] will be non-zero.
1015 The general actions of this function are:
1017 . Read the headers of the message (if any) into a chain of store
1020 . If there is a "sender:" header and the message is locally originated,
1021 throw it away, unless the caller is trusted, or unless
1022 active_local_sender_retain is set - which can only happen if
1023 active_local_from_check is false.
1025 . If recipients are to be extracted from the message, build the
1026 recipients list from the headers, removing any that were on the
1027 original recipients list (unless extract_addresses_remove_arguments is
1028 false), and at the same time, remove any bcc header that may be present.
1030 . Get the spool file for the data, sort out its unique name, open
1031 and lock it (but don't give it the name yet).
1033 . Generate a "Message-Id" header if the message doesn't have one, for
1034 locally-originated messages.
1036 . Generate a "Received" header.
1038 . Ensure the recipients list is fully qualified and rewritten if necessary.
1040 . If there are any rewriting rules, apply them to the sender address
1041 and also to the headers.
1043 . If there is no from: header, generate one, for locally-generated messages
1044 and messages in "submission mode" only.
1046 . If the sender is local, check that from: is correct, and if not, generate
1047 a Sender: header, unless message comes from a trusted caller, or this
1048 feature is disabled by active_local_from_check being false.
1050 . If there is no "date" header, generate one, for locally-originated
1051 or submission mode messages only.
1053 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1054 dot_ends mode, to the data file. Leave it open, to hold the lock.
1056 . Write the envelope and the headers to a new file.
1058 . Set the name for the header file; close it.
1060 . Set the name for the data file; close it.
1062 Because this function can potentially be called many times in a single
1063 SMTP connection, all store should be got by store_get(), so that it will be
1064 automatically retrieved after the message is accepted.
1066 FUDGE: It seems that sites on the net send out messages with just LF
1067 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1068 we make the CRs optional in all cases.
1070 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1071 new regime is now in place in which bare CRs in header lines are turned into LF
1072 followed by a space, so as not to terminate the header line.
1074 February 2004: A bare LF in a header line in a message whose first line was
1075 terminated by CRLF is treated in the same way as a bare CR.
1078 extract_recip TRUE if recipients are to be extracted from the message's
1081 Returns: TRUE there are more messages to be read (SMTP input)
1082 FALSE there are no more messages to be read (non-SMTP input
1083 or SMTP connection collapsed, or other failure)
1085 When reading a message for filter testing, the returned value indicates
1086 whether the headers (which is all that is read) were terminated by '.' or
1090 receive_msg(BOOL extract_recip)
1094 int process_info_len = Ustrlen(process_info);
1095 int error_rc = (error_handling == ERRORS_SENDER)?
1096 errors_sender_rc : EXIT_FAILURE;
1097 int header_size = 256;
1098 int start, end, domain, size, sptr;
1102 register int ptr = 0;
1104 BOOL contains_resent_headers = FALSE;
1105 BOOL extracted_ignored = FALSE;
1106 BOOL first_line_ended_crlf = TRUE_UNSET;
1107 BOOL smtp_yield = TRUE;
1110 BOOL resents_exist = FALSE;
1111 uschar *resent_prefix = US"";
1112 uschar *blackholed_by = NULL;
1115 error_block *bad_addresses = NULL;
1117 uschar *frozen_by = NULL;
1118 uschar *queued_by = NULL;
1121 struct stat statbuf;
1123 /* Final message to give to SMTP caller */
1125 uschar *smtp_reply = NULL;
1127 /* Working header pointers */
1129 header_line *h, *next;
1131 /* Flags for noting the existence of certain headers */
1133 /**** No longer check for these (Nov 2003)
1134 BOOL to_or_cc_header_exists = FALSE;
1135 BOOL bcc_header_exists = FALSE;
1138 BOOL date_header_exists = FALSE;
1140 /* Pointers to receive the addresses of headers whose contents we need. */
1142 header_line *from_header = NULL;
1143 header_line *subject_header = NULL;
1144 header_line *msgid_header = NULL;
1145 header_line *received_header;
1147 /* Variables for use when building the Received: header. */
1153 /* Release any open files that might have been cached while preparing to
1154 accept the message - e.g. by verifying addresses - because reading a message
1155 might take a fair bit of real time. */
1159 /* Initialize the chain of headers by setting up a place-holder for Received:
1160 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1161 pointing to the end of the chain to make adding headers simple. */
1163 received_header = header_list = header_last = store_get(sizeof(header_line));
1164 header_list->next = NULL;
1165 header_list->type = htype_old;
1166 header_list->text = NULL;
1167 header_list->slen = 0;
1169 /* Control block for the next header to be read. */
1171 next = store_get(sizeof(header_line));
1172 next->text = store_get(header_size);
1174 /* Initialize message id to be null (indicating no message read), and the
1175 header names list to be the normal list. Indicate there is no data file open
1176 yet, initialize the size and warning count, and deal with no size limit. */
1184 received_count = 1; /* For the one we will add */
1186 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1188 /* While reading the message, body_linecount and body_zerocount is computed.
1189 The full message_ linecount is set up only when the headers are read back in
1190 from the spool for delivery. */
1192 body_linecount = body_zerocount = 0;
1194 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1195 ids, and fractions of a second are required. See the comments that precede the
1196 message id creation below. */
1198 (void)gettimeofday(&message_id_tv, NULL);
1200 /* For other uses of the received time we can operate with granularity of one
1201 second, and for that we use the global variable received_time. This is for
1202 things like ultimate message timeouts. */
1204 received_time = message_id_tv.tv_sec;
1206 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1207 happen in the smtp_getc() function when it refills its buffer. */
1209 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1211 /* If not SMTP input, timeout happens only if configured, and we just set a
1212 single timeout for the whole message. */
1214 else if (receive_timeout > 0)
1216 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1217 alarm(receive_timeout);
1220 /* SIGTERM and SIGINT are caught always. */
1222 signal(SIGTERM, data_sigterm_sigint_handler);
1223 signal(SIGINT, data_sigterm_sigint_handler);
1225 /* Header lines in messages are not supposed to be very long, though when
1226 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1227 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1228 storing the header, and extend this as necessary using string_cat().
1230 To cope with total lunacies, impose an upper limit on the length of the header
1231 section of the message, as otherwise the store will fill up. We must also cope
1232 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1233 Folded header lines are joined into one string, leaving the '\n' characters
1234 inside them, so that writing them out reproduces the input.
1236 Loop for each character of each header; the next structure for chaining the
1237 header is set up already, with ptr the offset of the next character in
1242 int ch = (receive_getc)();
1244 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1245 SMTP must have a correct "." terminator. */
1247 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1249 smtp_reply = handle_lost_connection(US" (header)");
1251 goto TIDYUP; /* Skip to end of function */
1254 /* See if we are at the current header's size limit - there must be at least
1255 four bytes left. This allows for the new character plus a zero, plus two for
1256 extra insertions when we are playing games with dots and carriage returns. If
1257 we are at the limit, extend the text buffer. This could have been done
1258 automatically using string_cat() but because this is a tightish loop storing
1259 only one character at a time, we choose to do it inline. Normally
1260 store_extend() will be able to extend the block; only at the end of a big
1261 store block will a copy be needed. To handle the case of very long headers
1262 (and sometimes lunatic messages can have ones that are 100s of K long) we
1263 call store_release() for strings that have been copied - if the string is at
1264 the start of a block (and therefore the only thing in it, because we aren't
1265 doing any other gets), the block gets freed. We can only do this because we
1266 know there are no other calls to store_get() going on. */
1268 if (ptr >= header_size - 4)
1270 int oldsize = header_size;
1271 /* header_size += 256; */
1273 if (!store_extend(next->text, oldsize, header_size))
1275 uschar *newtext = store_get(header_size);
1276 memcpy(newtext, next->text, ptr);
1277 store_release(next->text);
1278 next->text = newtext;
1282 /* Cope with receiving a binary zero. There is dispute about whether
1283 these should be allowed in RFC 822 messages. The middle view is that they
1284 should not be allowed in headers, at least. Exim takes this attitude at
1285 the moment. We can't just stomp on them here, because we don't know that
1286 this line is a header yet. Set a flag to cause scanning later. */
1288 if (ch == 0) had_zero++;
1290 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1291 those from data files use just LF. Treat LF in local SMTP input as a
1292 terminator too. Treat EOF as a line terminator always. */
1294 if (ch == EOF) goto EOL;
1296 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1297 other MTAs accept this. We are therefore forced into this "liberalisation"
1298 too, so we accept LF as a line terminator whatever the source of the message.
1299 However, if the first line of the message ended with a CRLF, we treat a bare
1300 LF specially by inserting a white space after it to ensure that the header
1301 line is not terminated. */
1305 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1306 else if (first_line_ended_crlf) receive_ungetc(' ');
1310 /* This is not the end of the line. If this is SMTP input and this is
1311 the first character in the line and it is a "." character, ignore it.
1312 This implements the dot-doubling rule, though header lines starting with
1313 dots aren't exactly common. They are legal in RFC 822, though. If the
1314 following is CRLF or LF, this is the line that that terminates the
1315 entire message. We set message_ended to indicate this has happened (to
1316 prevent further reading), and break out of the loop, having freed the
1317 empty header, and set next = NULL to indicate no data line. */
1319 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1321 ch = (receive_getc)();
1324 ch = (receive_getc)();
1328 ch = '\r'; /* Revert to CR */
1333 message_ended = END_DOT;
1336 break; /* End character-reading loop */
1339 /* For non-SMTP input, the dot at the start of the line was really a data
1340 character. What is now in ch is the following character. We guaranteed
1341 enough space for this above. */
1345 next->text[ptr++] = '.';
1350 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1351 remember this case if this is the first line ending. */
1355 ch = (receive_getc)();
1358 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1362 /* Otherwise, put back the character after CR, and turn the bare CR
1365 ch = (receive_ungetc)(ch);
1366 next->text[ptr++] = '\n';
1371 /* We have a data character for the header line. */
1373 next->text[ptr++] = ch; /* Add to buffer */
1374 message_size++; /* Total message size so far */
1376 /* Handle failure due to a humungously long header section. The >= allows
1377 for the terminating \n. Add what we have so far onto the headers list so
1378 that it gets reflected in any error message, and back up the just-read
1381 if (message_size >= header_maxsize)
1383 next->text[ptr] = 0;
1385 next->type = htype_other;
1387 header_last->next = next;
1390 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1391 "%s (more than %d characters): message abandoned",
1392 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1396 smtp_reply = US"552 Message header is ridiculously long";
1397 receive_swallow_smtp();
1398 goto TIDYUP; /* Skip to end of function */
1403 give_local_error(ERRMESS_VLONGHEADER,
1404 string_sprintf("message header longer than %d characters received: "
1405 "message not accepted", header_maxsize), US"", error_rc, stdin,
1407 /* Does not return */
1411 continue; /* With next input character */
1413 /* End of header line reached */
1416 receive_linecount++; /* For BSMTP errors */
1418 /* Now put in the terminating newline. There is always space for
1419 at least two more characters. */
1421 next->text[ptr++] = '\n';
1424 /* A blank line signals the end of the headers; release the unwanted
1425 space and set next to NULL to indicate this. */
1434 /* There is data in the line; see if the next input character is a
1435 whitespace character. If it is, we have a continuation of this header line.
1436 There is always space for at least one character at this point. */
1440 int nextch = (receive_getc)();
1441 if (nextch == ' ' || nextch == '\t')
1443 next->text[ptr++] = nextch;
1445 continue; /* Iterate the loop */
1447 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1448 else ch = EOF; /* Cause main loop to exit at end */
1451 /* We have got to the real line end. Terminate the string and release store
1452 beyond it. If it turns out to be a real header, internal binary zeros will
1453 be squashed later. */
1455 next->text[ptr] = 0;
1457 store_reset(next->text + ptr + 1);
1459 /* Check the running total size against the overall message size limit. We
1460 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1461 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1462 headers - the code to read the body will then also hit the buffer. */
1464 if (message_size > thismessage_size_limit) break;
1466 /* A line that is not syntactically correct for a header also marks
1467 the end of the headers. In this case, we leave next containing the
1468 first data line. This might actually be several lines because of the
1469 continuation logic applied above, but that doesn't matter.
1471 It turns out that smail, and presumably sendmail, accept leading lines
1474 From ph10 Fri Jan 5 12:35 GMT 1996
1476 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1477 find any documentation of this, but for compatibility it had better be
1478 accepted. Exim restricts it to the case of non-smtp messages, and
1479 treats it as an alternative to the -f command line option. Thus it is
1480 ignored except for trusted users or filter testing. Otherwise it is taken
1481 as the sender address, unless -f was used (sendmail compatibility).
1483 It further turns out that some UUCPs generate the From_line in a different
1486 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1488 The regex for matching these things is now capable of recognizing both
1489 formats (including 2- and 4-digit years in the latter). In fact, the regex
1490 is now configurable, as is the expansion string to fish out the sender.
1492 Even further on it has been discovered that some broken clients send
1493 these lines in SMTP messages. There is now an option to ignore them from
1494 specified hosts or networks. Sigh. */
1496 if (header_last == header_list &&
1499 (sender_host_address != NULL &&
1500 verify_check_host(&ignore_fromline_hosts) == OK)
1502 (sender_host_address == NULL && ignore_fromline_local)
1504 regex_match_and_setup(regex_From, next->text, 0, -1))
1506 if (!sender_address_forced)
1508 uschar *uucp_sender = expand_string(uucp_from_sender);
1509 if (uucp_sender == NULL)
1511 log_write(0, LOG_MAIN|LOG_PANIC,
1512 "expansion of \"%s\" failed after matching "
1513 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1517 int start, end, domain;
1519 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1520 &start, &end, &domain, TRUE);
1521 if (newsender != NULL)
1523 if (domain == 0 && newsender[0] != 0)
1524 newsender = rewrite_address_qualify(newsender, FALSE);
1526 if (filter_test != NULL || receive_check_set_sender(newsender))
1528 sender_address = newsender;
1530 if (trusted_caller || filter_test != NULL)
1532 authenticated_sender = NULL;
1533 originator_name = US"";
1534 sender_local = FALSE;
1537 if (filter_test != NULL)
1538 printf("Sender taken from \"From \" line\n");
1545 /* Not a leading "From " line. Check to see if it is a valid header line.
1546 Header names may contain any non-control characters except space and colon,
1551 uschar *p = next->text;
1553 /* If not a valid header line, break from the header reading loop, leaving
1554 next != NULL, indicating that it holds the first line of the body. */
1556 if (isspace(*p)) break;
1557 while (mac_isgraph(*p) && *p != ':') p++;
1558 while (isspace(*p)) p++;
1561 body_zerocount = had_zero;
1565 /* We have a valid header line. If there were any binary zeroes in
1566 the line, stomp on them here. */
1569 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1571 /* It is perfectly legal to have an empty continuation line
1572 at the end of a header, but it is confusing to humans
1573 looking at such messages, since it looks like a blank line.
1574 Reduce confusion by removing redundant white space at the
1575 end. We know that there is at least one printing character
1576 (the ':' tested for above) so there is no danger of running
1579 p = next->text + ptr - 2;
1582 while (*p == ' ' || *p == '\t') p--;
1583 if (*p != '\n') break;
1584 ptr = (p--) - next->text + 1;
1585 message_size -= next->slen - ptr;
1586 next->text[ptr] = 0;
1590 /* Add the header to the chain */
1592 next->type = htype_other;
1594 header_last->next = next;
1597 /* Check the limit for individual line lengths. This comes after adding to
1598 the chain so that the failing line is reflected if a bounce is generated
1599 (for a local message). */
1601 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1603 log_write(0, LOG_MAIN, "overlong message header line received from "
1604 "%s (more than %d characters): message abandoned",
1605 sender_host_unknown? sender_ident : sender_fullhost,
1606 header_line_maxsize);
1610 smtp_reply = US"552 A message header line is too long";
1611 receive_swallow_smtp();
1612 goto TIDYUP; /* Skip to end of function */
1617 give_local_error(ERRMESS_VLONGHDRLINE,
1618 string_sprintf("message header line longer than %d characters "
1619 "received: message not accepted", header_line_maxsize), US"",
1620 error_rc, stdin, header_list->next);
1621 /* Does not return */
1625 /* Note if any resent- fields exist. */
1627 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1629 resents_exist = TRUE;
1630 resent_prefix = US"Resent-";
1634 /* The line has been handled. If we have hit EOF, break out of the loop,
1635 indicating no pending data line. */
1637 if (ch == EOF) { next = NULL; break; }
1639 /* Set up for the next header */
1642 next = store_get(sizeof(header_line));
1643 next->text = store_get(header_size);
1646 } /* Continue, starting to read the next header */
1648 /* At this point, we have read all the headers into a data structure in main
1649 store. The first header is still the dummy placeholder for the Received: header
1650 we are going to generate a bit later on. If next != NULL, it contains the first
1651 data line - which terminated the headers before reaching a blank line (not the
1656 debug_printf(">>Headers received:\n");
1657 for (h = header_list->next; h != NULL; h = h->next)
1658 debug_printf("%s", h->text);
1662 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1663 is dropped immediately after valid headers, the next thing we will see is EOF.
1664 We must test for this specially, as further down the reading of the data is
1665 skipped if already at EOF. */
1667 if (smtp_input && (receive_feof)())
1669 smtp_reply = handle_lost_connection(US" (after header)");
1671 goto TIDYUP; /* Skip to end of function */
1674 /* If this is a filter test run and no headers were read, output a warning
1675 in case there is a mistake in the test message. */
1677 if (filter_test != NULL && header_list->next == NULL)
1678 printf("Warning: no message headers read\n");
1681 /* Scan the headers to identify them. Some are merely marked for later
1682 processing; some are dealt with here. */
1684 for (h = header_list->next; h != NULL; h = h->next)
1686 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1687 if (is_resent) contains_resent_headers = TRUE;
1689 switch (header_checkname(h, is_resent))
1691 /* "Bcc:" gets flagged, and its existence noted, whether it's resent- or
1695 h->type = htype_bcc;
1697 bcc_header_exists = TRUE;
1701 /* "Cc:" gets flagged, and the existence of a recipient header is noted,
1702 whether it's resent- or not. */
1707 to_or_cc_header_exists = TRUE;
1711 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1714 date_header_exists = !resents_exist || is_resent;
1717 /* Same comments as about Return-Path: below. */
1719 case htype_delivery_date:
1720 if (delivery_date_remove) h->type = htype_old;
1723 /* Same comments as about Return-Path: below. */
1725 case htype_envelope_to:
1726 if (envelope_to_remove) h->type = htype_old;
1729 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1730 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1731 header consists of just the login id of the user who called Exim, rewrite
1732 it with the gecos field first. Apply this rule to Resent-From: if there
1733 are resent- fields. */
1736 h->type = htype_from;
1737 if (!resents_exist || is_resent)
1742 uschar *s = Ustrchr(h->text, ':') + 1;
1743 while (isspace(*s)) s++;
1744 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1746 uschar *name = is_resent? US"Resent-From" : US"From";
1747 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1748 originator_login, qualify_domain_sender);
1749 from_header = header_last;
1750 h->type = htype_old;
1751 DEBUG(D_receive|D_rewrite)
1752 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1758 /* Identify the Message-id: header for generating "in-reply-to" in the
1759 autoreply transport. For incoming logging, save any resent- value. In both
1760 cases, take just the first of any multiples. */
1763 if (msgid_header == NULL && (!resents_exist || is_resent))
1770 /* Flag all Received: headers */
1772 case htype_received:
1773 h->type = htype_received;
1777 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1779 case htype_reply_to:
1780 h->type = htype_reply_to;
1783 /* The Return-path: header is supposed to be added to messages when
1784 they leave the SMTP system. We shouldn't receive messages that already
1785 contain Return-path. However, since Exim generates Return-path: on
1786 local delivery, resent messages may well contain it. We therefore
1787 provide an option (which defaults on) to remove any Return-path: headers
1788 on input. Removal actually means flagging as "old", which prevents the
1789 header being transmitted with the message. */
1791 case htype_return_path:
1792 if (return_path_remove) h->type = htype_old;
1794 /* If we are testing a mail filter file, use the value of the
1795 Return-Path: header to set up the return_path variable, which is not
1796 otherwise set. However, remove any <> that surround the address
1797 because the variable doesn't have these. */
1799 if (filter_test != NULL)
1801 uschar *start = h->text + 12;
1802 uschar *end = start + Ustrlen(start);
1803 while (isspace(*start)) start++;
1804 while (end > start && isspace(end[-1])) end--;
1805 if (*start == '<' && end[-1] == '>')
1810 return_path = string_copyn(start, end - start);
1811 printf("Return-path taken from \"Return-path:\" header line\n");
1815 /* If there is a "Sender:" header and the message is locally originated,
1816 and from an untrusted caller, or if we are in submission mode for a remote
1817 message, mark it "old" so that it will not be transmitted with the message,
1818 unless active_local_sender_retain is set. (This can only be true if
1819 active_local_from_check is false.) If there are any resent- headers in the
1820 message, apply this rule to Resent-Sender: instead of Sender:. Messages
1821 with multiple resent- header sets cannot be tidily handled. (For this
1822 reason, at least one MUA - Pine - turns old resent- headers into X-resent-
1823 headers when resending, leaving just one set.) */
1826 h->type = ((!active_local_sender_retain &&
1827 ((sender_local && !trusted_caller) || submission_mode)
1829 (!resents_exist||is_resent))?
1830 htype_old : htype_sender;
1833 /* Remember the Subject: header for logging. There is no Resent-Subject */
1839 /* "To:" gets flagged, and the existence of a recipient header is noted,
1840 whether it's resent- or not. */
1845 to_or_cc_header_exists = TRUE;
1851 /* Extract recipients from the headers if that is required (the -t option).
1852 Note that this is documented as being done *before* any address rewriting takes
1853 place. There are two possibilities:
1855 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
1856 recipients already listed are to be REMOVED from the message. Smail 3 works
1857 like this. We need to build a non-recipients tree for that list, because in
1858 subsequent processing this data is held in a tree and that's what the
1859 spool_write_header() function expects. Make sure that non-recipient addresses
1860 are fully qualified and rewritten if necessary.
1862 (2) According to other sendmail documentation, -t ADDS extracted recipients to
1863 those in the command line arguments (and it is rumoured some other MTAs do
1864 this). Therefore, there is an option to make Exim behave this way.
1866 *** Notes on "Resent-" header lines ***
1868 The presence of resent-headers in the message makes -t horribly ambiguous.
1869 Experiments with sendmail showed that it uses recipients for all resent-
1870 headers, totally ignoring the concept of "sets of resent- headers" as described
1871 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
1872 with all the addresses in one instance of each header.
1874 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
1875 error for -t if there were resent- headers in the message. However, after a
1876 discussion on the mailing list, I've learned that there are MUAs that use
1877 resent- headers with -t, and also that the stuff about sets of resent- headers
1878 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
1879 message with -t and resent- header lines makes sure that only *its* resent-
1880 headers are present; previous ones are often renamed as X-resent- for example.
1882 Consequently, Exim has been changed so that, if any resent- header lines are
1883 present, the recipients are taken from all of the appropriate resent- lines,
1884 and not from the ordinary To:, Cc:, etc. */
1889 error_block **bnext = &bad_addresses;
1891 if (extract_addresses_remove_arguments)
1893 while (recipients_count-- > 0)
1895 uschar *s = rewrite_address(recipients_list[recipients_count].address,
1896 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
1897 tree_add_nonrecipient(s);
1899 recipients_list = NULL;
1900 recipients_count = recipients_list_max = 0;
1903 parse_allow_group = TRUE; /* Allow address group syntax */
1905 /* Now scan the headers */
1907 for (h = header_list->next; h != NULL; h = h->next)
1909 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
1910 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
1912 uschar *s = Ustrchr(h->text, ':') + 1;
1913 while (isspace(*s)) s++;
1917 uschar *ss = parse_find_address_end(s, FALSE);
1918 uschar *recipient, *errmess, *p, *pp;
1919 int start, end, domain;
1921 /* Check on maximum */
1923 if (recipients_max > 0 && ++rcount > recipients_max)
1925 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
1926 US"message rejected: ", error_rc, stdin, NULL);
1927 /* Does not return */
1930 /* Make a copy of the address, and remove any internal newlines. These
1931 may be present as a result of continuations of the header line. The
1932 white space that follows the newline must not be removed - it is part
1935 pp = recipient = store_get(ss - s + 1);
1936 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
1938 recipient = parse_extract_address(recipient, &errmess, &start, &end,
1941 /* Keep a list of all the bad addresses so we can send a single
1942 error message at the end. However, an empty address is not an error;
1943 just ignore it. This can come from an empty group list like
1945 To: Recipients of list:;
1947 If there are no recipients at all, an error will occur later. */
1949 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
1951 int len = Ustrlen(s);
1952 error_block *b = store_get(sizeof(error_block));
1953 while (len > 0 && isspace(s[len-1])) len--;
1955 b->text1 = string_printing(string_copyn(s, len));
1961 /* If the recipient is already in the nonrecipients tree, it must
1962 have appeared on the command line with the option extract_addresses_
1963 remove_arguments set. Do not add it to the recipients, and keep a note
1964 that this has happened, in order to give a better error if there are
1965 no recipients left. */
1967 else if (recipient != NULL)
1969 if (tree_search(tree_nonrecipients, recipient) == NULL)
1970 receive_add_recipient(recipient, -1);
1972 extracted_ignored = TRUE;
1975 /* Move on past this address */
1977 s = ss + (*ss? 1:0);
1978 while (isspace(*s)) s++;
1981 /* If this was the bcc: header, mark it "old", which means it
1982 will be kept on the spool, but not transmitted as part of the
1985 if (h->type == htype_bcc)
1987 h->type = htype_old;
1989 bcc_header_exists = FALSE;
1992 } /* For appropriate header line */
1993 } /* For each header line */
1995 parse_allow_group = FALSE; /* Reset group syntax flags */
1996 parse_found_group = FALSE;
1999 /* Now build the unique message id. This has changed several times over the
2000 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2001 Retaining all the history in the comment has become too unwieldy - read
2002 previous release sources if you want it.
2004 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2005 The first part is the current time, in seconds. The second part is the current
2006 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2007 can hold a number in the range 0-3843. It used to be a computed sequence
2008 number, but is now the fractional component of the current time in units of
2009 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2010 received, Exim ensures that the timer has ticked at the appropriate level
2011 before proceeding, to avoid duplication if the pid happened to be re-used
2012 within the same time period. It seems likely that most messages will take at
2013 least half a millisecond to be received, so no delay will normally be
2014 necessary. At least for some time...
2016 There is a modification when localhost_number is set. Formerly this was allowed
2017 to be as large as 255. Now it is restricted to the range 0-16, and the final
2018 component of the message id becomes (localhost_number * 200) + fractional time
2019 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2021 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2022 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2023 still allows the tttttt field to hold a large enough number to last for some
2024 more decades, and the final two-digit field can hold numbers up to 1295, which
2025 is enough for milliseconds (instead of 1/2000 of a second).
2027 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2028 pid, so it is probably safe because pids have to be positive. The
2029 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2030 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2032 Note that string_base62() returns its data in a static storage block, so it
2033 must be copied before calling string_base62() again. It always returns exactly
2036 There doesn't seem to be anything in the RFC which requires a message id to
2037 start with a letter, but Smail was changed to ensure this. The external form of
2038 the message id (as supplied by string expansion) therefore starts with an
2039 additional leading 'E'. The spool file names do not include this leading
2040 letter and it is not used internally.
2042 NOTE: If ever the format of message ids is changed, the regular expression for
2043 checking that a string is in this format must be updated in a corresponding
2044 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2045 must also be changed to reflect the correct string length. Then, of course,
2046 other programs that rely on the message id format will need updating too. */
2048 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2049 message_id[6] = '-';
2050 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2052 /* Deal with the case where the host number is set. The value of the number was
2053 checked when it was read, to ensure it isn't too big. The timing granularity is
2054 left in id_resolution so that an appropriate wait can be done after receiving
2055 the message, if necessary (we hope it won't be). */
2057 if (host_number_string != NULL)
2059 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2060 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2061 string_base62((long int)(
2062 host_number * (1000000/id_resolution) +
2063 message_id_tv.tv_usec/id_resolution)) + 4);
2066 /* Host number not set: final field is just the fractional time at an
2067 appropriate resolution. */
2071 id_resolution = (BASE_62 == 62)? 500 : 1000;
2072 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2073 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2076 /* Add the current message id onto the current process info string if
2079 (void)string_format(process_info + process_info_len,
2080 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2082 /* If we are using multiple input directories, set up the one for this message
2083 to be the least significant base-62 digit of the time of arrival. Otherwise
2084 ensure that it is an empty string. */
2086 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2088 /* Now that we have the message-id, if there is no message-id: header, generate
2089 one, but only for local or submission mode messages. This can be
2090 user-configured if required, but we had better flatten any illegal characters
2093 if (msgid_header == NULL && (sender_host_address == NULL || submission_mode))
2096 uschar *id_text = US"";
2097 uschar *id_domain = primary_hostname;
2099 /* Permit only letters, digits, dots, and hyphens in the domain */
2101 if (message_id_domain != NULL)
2103 uschar *new_id_domain = expand_string(message_id_domain);
2104 if (new_id_domain == NULL)
2106 if (!expand_string_forcedfail)
2107 log_write(0, LOG_MAIN|LOG_PANIC,
2108 "expansion of \"%s\" (message_id_header_domain) "
2109 "failed: %s", message_id_domain, expand_string_message);
2111 else if (*new_id_domain != 0)
2113 id_domain = new_id_domain;
2114 for (p = id_domain; *p != 0; p++)
2115 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2119 /* Permit all characters except controls and RFC 2822 specials in the
2120 additional text part. */
2122 if (message_id_text != NULL)
2124 uschar *new_id_text = expand_string(message_id_text);
2125 if (new_id_text == NULL)
2127 if (!expand_string_forcedfail)
2128 log_write(0, LOG_MAIN|LOG_PANIC,
2129 "expansion of \"%s\" (message_id_header_text) "
2130 "failed: %s", message_id_text, expand_string_message);
2132 else if (*new_id_text != 0)
2134 id_text = new_id_text;
2135 for (p = id_text; *p != 0; p++)
2136 if (mac_iscntrl_or_special(*p)) *p = '-';
2140 /* Add the header line */
2142 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2143 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2146 /* If we are to log recipients, keep a copy of the raw ones before any possible
2147 rewriting. Must copy the count, because later ACLs and the local_scan()
2148 function may mess with the real recipients. */
2150 if ((log_extra_selector & LX_received_recipients) != 0)
2152 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2153 for (i = 0; i < recipients_count; i++)
2154 raw_recipients[i] = string_copy(recipients_list[i].address);
2155 raw_recipients_count = recipients_count;
2158 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2159 recipients will get here only if the conditions were right (allow_unqualified_
2160 recipient is TRUE). */
2162 for (i = 0; i < recipients_count; i++)
2163 recipients_list[i].address =
2164 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2165 global_rewrite_rules, rewrite_existflags);
2167 /* If there is no From: header, generate one for local or submission_mode
2168 messages. If there is no sender address, but the sender is local or this is a
2169 local delivery error, use the originator login. This shouldn't happen for
2170 genuine bounces, but might happen for autoreplies. The addition of From: must
2171 be done *before* checking for the possible addition of a Sender: header,
2172 because untrusted_set_sender allows an untrusted user to set anything in the
2173 envelope (which might then get info From:) but we still want to ensure a valid
2174 Sender: if it is required. */
2176 if (from_header == NULL && (sender_host_address == NULL || submission_mode))
2178 /* Envelope sender is empty */
2180 if (sender_address[0] == 0)
2182 if (sender_local || local_error_message)
2184 header_add(htype_from, "%sFrom: %s%s%s@%s%s\n", resent_prefix,
2186 (originator_name[0] == 0)? "" : " <",
2187 local_part_quote(originator_login),
2188 qualify_domain_sender,
2189 (originator_name[0] == 0)? "" : ">");
2191 else if (submission_mode && authenticated_id != NULL)
2193 if (submission_domain == NULL)
2195 header_add(htype_from, "%sFrom: %s@%s\n", resent_prefix,
2196 local_part_quote(authenticated_id), qualify_domain_sender);
2198 else if (submission_domain[0] == 0) /* empty => whole address set */
2200 header_add(htype_from, "%sFrom: %s\n", resent_prefix,
2205 header_add(htype_from, "%sFrom: %s@%s\n", resent_prefix,
2206 local_part_quote(authenticated_id), submission_domain);
2208 from_header = header_last; /* To get it checked for Sender: */
2212 /* There is a non-null envelope sender. Build the header using the original
2213 sender address, before any rewriting that might have been done while
2218 if (!smtp_input || sender_local)
2219 header_add(htype_from, "%sFrom: %s%s%s%s\n",
2220 resent_prefix, originator_name,
2221 (originator_name[0] == 0)? "" : " <",
2222 (sender_address_unrewritten == NULL)?
2223 sender_address : sender_address_unrewritten,
2224 (originator_name[0] == 0)? "" : ">");
2226 header_add(htype_from, "%sFrom: %s\n", resent_prefix, sender_address);
2228 from_header = header_last; /* To get it checked for Sender: */
2233 /* If the sender is local, or if we are in submission mode and there is an
2234 authenticated_id, check that an existing From: is correct, and if not, generate
2235 a Sender: header, unless disabled. Any previously-existing Sender: header was
2236 removed above. Note that sender_local, as well as being TRUE if the caller of
2237 exim is not trusted, is also true if a trusted caller did not supply a -f
2238 argument for non-smtp input. To allow trusted callers to forge From: without
2239 supplying -f, we have to test explicitly here. If the From: header contains
2240 more than one address, then the call to parse_extract_address fails, and a
2241 Sender: header is inserted, as required. */
2243 if (from_header != NULL &&
2244 (active_local_from_check &&
2245 ((sender_local && !trusted_caller) ||
2246 (submission_mode && authenticated_id != NULL))
2249 BOOL make_sender = TRUE;
2250 int start, end, domain;
2252 uschar *from_address =
2253 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2254 &start, &end, &domain, FALSE);
2255 uschar *generated_sender_address;
2257 if (submission_mode)
2259 if (submission_domain == NULL)
2261 generated_sender_address = string_sprintf("%s@%s",
2262 local_part_quote(authenticated_id), qualify_domain_sender);
2264 else if (submission_domain[0] == 0) /* empty => full address */
2266 generated_sender_address = string_sprintf("%s",
2271 generated_sender_address = string_sprintf("%s@%s",
2272 local_part_quote(authenticated_id), submission_domain);
2276 generated_sender_address = string_sprintf("%s@%s",
2277 local_part_quote(originator_login), qualify_domain_sender);
2279 /* Remove permitted prefixes and suffixes from the local part of the From:
2280 address before doing the comparison with the generated sender. */
2282 if (from_address != NULL)
2285 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2287 if (at != NULL) *at = 0;
2288 from_address += route_check_prefix(from_address, local_from_prefix);
2289 slen = route_check_suffix(from_address, local_from_suffix);
2292 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2293 from_address += slen;
2295 if (at != NULL) *at = '@';
2297 if (strcmpic(generated_sender_address, from_address) == 0 ||
2298 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2299 make_sender = FALSE;
2302 /* We have to cause the Sender header to be rewritten if there are
2303 appropriate rewriting rules. */
2307 if (submission_mode)
2308 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2309 generated_sender_address);
2311 header_add(htype_sender, "%sSender: %s <%s>\n",
2312 resent_prefix, originator_name, generated_sender_address);
2317 /* If there are any rewriting rules, apply them to the sender address, unless
2318 it has already been rewritten as part of verification for SMTP input. */
2320 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2321 sender_address[0] != 0)
2323 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2324 global_rewrite_rules, rewrite_existflags);
2325 DEBUG(D_receive|D_rewrite)
2326 debug_printf("rewritten sender = %s\n", sender_address);
2330 /* The headers must be run through rewrite_header(), because it ensures that
2331 addresses are fully qualified, as well as applying any rewriting rules that may
2334 Qualification of header addresses in a message from a remote host happens only
2335 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2336 appropriate. For local messages, qualification always happens, unless -bnq is
2337 used to explicitly suppress it. No rewriting is done for an unqualified address
2338 that is left untouched.
2340 We start at the second header, skipping our own Received:. This rewriting is
2341 documented as happening *after* recipient addresses are taken from the headers
2342 by the -t command line option. An added Sender: gets rewritten here. */
2344 for (h = header_list->next; h != NULL; h = h->next)
2346 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2347 rewrite_existflags, TRUE);
2348 if (newh != NULL) h = newh;
2352 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2353 "cc", or "bcc". Note that although the minimal examples in RFC822 show just
2354 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2355 exists, this applies to the set of resent- headers rather than the normal set.
2357 The requirement for a recipient header has been removed in RFC 2822. Earlier
2358 versions of Exim added a To: header for locally submitted messages, and an
2359 empty Bcc: header for others or when always_bcc was set. In the light of the
2360 changes in RFC 2822, we now always add Bcc: just in case there are still MTAs
2361 out there that insist on the RFC 822 syntax.
2363 November 2003: While generally revising what Exim does to fix up headers, it
2364 seems like a good time to remove this altogether. */
2367 if (!to_or_cc_header_exists && !bcc_header_exists)
2368 header_add(htype_bcc, "Bcc:\n");
2371 /* If there is no date header, generate one if the message originates locally
2372 (i.e. not over TCP/IP) or the submission mode flag is set. Messages without
2373 Date: are not valid, but it seems to be more confusing if Exim adds one to
2374 all remotely-originated messages. */
2376 if (!date_header_exists && (sender_host_address == NULL || submission_mode))
2377 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2379 search_tidyup(); /* Free any cached resources */
2381 /* Show the complete set of headers if debugging. Note that the first one (the
2382 new Received:) has not yet been set. */
2386 debug_printf(">>Headers after rewriting and local additions:\n");
2387 for (h = header_list->next; h != NULL; h = h->next)
2388 debug_printf("%c %s", h->type, h->text);
2392 /* The headers are now complete in store. If we are running in filter
2393 testing mode, that is all this function does. Return TRUE if the message
2394 ended with a dot. */
2396 if (filter_test != NULL)
2398 process_info[process_info_len] = 0;
2399 return message_ended == END_DOT;
2402 /* Open a new spool file for the data portion of the message. We need
2403 to access it both via a file descriptor and a stream. Try to make the
2404 directory if it isn't there. Note re use of sprintf: spool_directory
2405 is checked on input to be < 200 characters long. */
2407 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2409 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2412 if (errno == ENOENT)
2415 sprintf(CS temp, "input/%s", message_subdir);
2416 if (message_subdir[0] == 0) temp[5] = 0;
2417 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2418 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2421 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2422 spool_name, strerror(errno));
2425 /* Make sure the file's group is the Exim gid, and double-check the mode
2426 because the group setting doesn't always get set automatically. */
2428 fchown(data_fd, exim_uid, exim_gid);
2429 fchmod(data_fd, SPOOL_MODE);
2431 /* We now have data file open. Build a stream for it and lock it. We lock only
2432 the first line of the file (containing the message ID) because otherwise there
2433 are problems when Exim is run under Cygwin (I'm told). See comments in
2434 spool_in.c, where the same locking is done. */
2436 data_file = fdopen(data_fd, "w+");
2437 lock_data.l_type = F_WRLCK;
2438 lock_data.l_whence = SEEK_SET;
2439 lock_data.l_start = 0;
2440 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2442 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2443 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2444 errno, strerror(errno));
2446 /* We have an open, locked data file. Write the message id to it to make it
2447 self-identifying. Then read the remainder of the input of this message and
2448 write it to the data file. If the variable next != NULL, it contains the first
2449 data line (which was read as a header but then turned out not to have the right
2450 format); write it (remembering that it might contain binary zeros). The result
2451 of fwrite() isn't inspected; instead we call ferror() below. */
2453 fprintf(data_file, "%s-D\n", message_id);
2456 uschar *s = next->text;
2457 int len = next->slen;
2458 fwrite(s, 1, len, data_file);
2459 body_linecount++; /* Assumes only 1 line */
2462 /* Note that we might already be at end of file, or the logical end of file
2463 (indicated by '.'), or might have encountered an error while writing the
2464 message id or "next" line. */
2466 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2470 message_ended = read_message_data_smtp(data_file);
2471 receive_linecount++; /* The terminating "." line */
2473 else message_ended = read_message_data(data_file);
2475 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2477 /* Handle premature termination of SMTP */
2479 if (smtp_input && message_ended == END_EOF)
2481 Uunlink(spool_name); /* Lose data file when closed */
2482 message_id[0] = 0; /* Indicate no message accepted */
2483 smtp_reply = handle_lost_connection(US"");
2485 goto TIDYUP; /* Skip to end of function */
2488 /* Handle message that is too big. Don't use host_or_ident() in the log
2489 message; we want to see the ident value even for non-remote messages. */
2491 if (message_ended == END_SIZE)
2493 Uunlink(spool_name); /* Lose the data file when closed */
2494 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2496 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2497 "message too big: read=%d max=%d",
2499 (sender_fullhost == NULL)? "" : " H=",
2500 (sender_fullhost == NULL)? US"" : sender_fullhost,
2501 (sender_ident == NULL)? "" : " U=",
2502 (sender_ident == NULL)? US"" : sender_ident,
2504 thismessage_size_limit);
2508 smtp_reply = US"552 Message size exceeds maximum permitted";
2509 message_id[0] = 0; /* Indicate no message accepted */
2510 goto TIDYUP; /* Skip to end of function */
2514 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2515 give_local_error(ERRMESS_TOOBIG,
2516 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2517 US"message rejected: ", error_rc, data_file, header_list);
2518 /* Does not return */
2523 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2524 example, there may be some expansion in an ACL that uses a timer.) */
2526 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2528 /* The message body has now been read into the data file. Call fflush() to
2529 empty the buffers in C, and then call fsync() to get the data written out onto
2530 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2531 having to do this). If there was an I/O error on either input or output,
2532 attempt to send an error message, and unlink the spool file. For non-SMTP input
2533 we can then give up. Note that for SMTP input we must swallow the remainder of
2534 the input in cases of output errors, since the far end doesn't expect to see
2535 anything until the terminating dot line is sent. */
2537 if (fflush(data_file) == EOF || ferror(data_file) ||
2538 fsync(fileno(data_file)) < 0 || (receive_ferror)())
2540 uschar *msg_errno = US strerror(errno);
2541 BOOL input_error = (receive_ferror)() != 0;
2542 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2543 input_error? "Input read" : "Spool write",
2545 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2547 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2548 Uunlink(spool_name); /* Lose the data file */
2553 smtp_reply = US"451 Error while reading input data";
2556 smtp_reply = US"451 Error while writing spool file";
2557 receive_swallow_smtp();
2559 message_id[0] = 0; /* Indicate no message accepted */
2560 goto TIDYUP; /* Skip to end of function */
2565 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2566 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2568 /* Does not return */
2573 /* No I/O errors were encountered while writing the data file. */
2575 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2578 /* If there were any bad addresses extracted by -t, or there were no recipients
2579 left after -t, send a message to the sender of this message, or write it to
2580 stderr if the error handling option is set that way. Note that there may
2581 legitimately be no recipients for an SMTP message if they have all been removed
2584 We need to rewind the data file in order to read it. In the case of no
2585 recipients or stderr error writing, throw the data file away afterwards, and
2586 exit. (This can't be SMTP, which always ensures there's at least one
2587 syntactically good recipient address.) */
2589 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2593 if (recipients_count == 0) debug_printf("*** No recipients\n");
2594 if (bad_addresses != NULL)
2596 error_block *eblock = bad_addresses;
2597 debug_printf("*** Bad address(es)\n");
2598 while (eblock != NULL)
2600 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2601 eblock = eblock->next;
2606 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2608 /* If configured to send errors to the sender, but this fails, force
2609 a failure error code. We use a special one for no recipients so that it
2610 can be detected by the autoreply transport. Otherwise error_rc is set to
2611 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2612 it is EXIT_SUCCESS. */
2614 if (error_handling == ERRORS_SENDER)
2616 if (!moan_to_sender(
2617 (bad_addresses == NULL)?
2618 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2619 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2620 bad_addresses, header_list, data_file, FALSE))
2621 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2625 if (bad_addresses == NULL)
2627 if (extracted_ignored)
2628 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2630 fprintf(stderr, "exim: no recipients in message\n");
2634 fprintf(stderr, "exim: invalid address%s",
2635 (bad_addresses->next == NULL)? ":" : "es:\n");
2636 while (bad_addresses != NULL)
2638 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2639 bad_addresses->text2);
2640 bad_addresses = bad_addresses->next;
2645 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2647 Uunlink(spool_name);
2649 exim_exit(error_rc);
2653 /* Data file successfully written. Generate text for the Received: header by
2654 expanding the configured string, and adding a timestamp. By leaving this
2655 operation till now, we ensure that the timestamp is the time that message
2656 reception was completed. However, this is deliberately done before calling the
2657 data ACL and local_scan().
2659 This Received: header may therefore be inspected by the data ACL and by code in
2660 the local_scan() function. When they have run, we update the timestamp to be
2661 the final time of reception.
2663 If there is just one recipient, set up its value in the $received_for variable
2664 for use when we generate the Received: header.
2666 Note: the checking for too many Received: headers is handled by the delivery
2669 timestamp = expand_string(US"${tod_full}");
2670 if (recipients_count == 1) received_for = recipients_list[0].address;
2671 received = expand_string(received_header_text);
2672 received_for = NULL;
2674 if (received == NULL)
2676 Uunlink(spool_name); /* Lose the data file */
2677 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2678 "(received_header_text) failed: %s", string_printing(received_header_text),
2679 expand_string_message);
2682 /* The first element on the header chain is reserved for the Received header,
2683 so all we have to do is fill in the text pointer, and set the type. However, if
2684 the result of the expansion is an empty string, we leave the header marked as
2685 "old" so as to refrain from adding a Received header. */
2687 if (received[0] == 0)
2689 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2690 received_header->type = htype_old;
2694 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2695 received_header->type = htype_received;
2698 received_header->slen = Ustrlen(received_header->text);
2700 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2701 received_header->type, received_header->text);
2703 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2705 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2706 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2708 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2709 now, before running the DATA ACL. */
2711 add_acl_headers(US"MAIL or RCPT");
2713 /* If an ACL is specified for checking things at this stage of reception of a
2714 message, run it, unless all the recipients were removed by "discard" in earlier
2715 ACLs. That is the only case in which recipients_count can be zero at this
2716 stage. Set deliver_datafile to point to the data file so that $message_body and
2717 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2720 deliver_datafile = data_fd;
2722 if (recipients_count == 0)
2724 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2728 enable_dollar_recipients = TRUE;
2730 /* Handle interactive SMTP messages */
2732 if (smtp_input && !smtp_batched_input)
2735 #ifdef WITH_CONTENT_SCAN
2737 if (acl_smtp_mime != NULL && recipients_count > 0)
2740 uschar rfc822_file_path[2048];
2741 unsigned long long mbox_size;
2742 header_line *my_headerlist;
2743 uschar *user_msg, *log_msg;
2744 int mime_part_count_buffer = -1;
2746 memset(CS rfc822_file_path,0,2048);
2748 /* check if it is a MIME message */
2749 my_headerlist = header_list;
2750 while (my_headerlist != NULL) {
2751 /* skip deleted headers */
2752 if (my_headerlist->type == '*') {
2753 my_headerlist = my_headerlist->next;
2756 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0) {
2757 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
2760 my_headerlist = my_headerlist->next;
2763 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
2767 /* make sure the eml mbox file is spooled up */
2768 mbox_file = spool_mbox(&mbox_size);
2769 if (mbox_file == NULL) {
2770 /* error while spooling */
2771 log_write(0, LOG_MAIN|LOG_PANIC,
2772 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
2773 Uunlink(spool_name);
2775 smtp_respond(451, TRUE, US"temporary local problem");
2776 message_id[0] = 0; /* Indicate no message accepted */
2777 smtp_reply = US""; /* Indicate reply already sent */
2778 goto TIDYUP; /* Skip to end of function */
2784 mime_part_count = -1;
2785 rc = mime_acl_check(mbox_file, NULL, &user_msg, &log_msg);
2788 if (Ustrlen(rfc822_file_path) > 0) {
2789 mime_part_count = mime_part_count_buffer;
2791 if (unlink(CS rfc822_file_path) == -1) {
2792 log_write(0, LOG_PANIC,
2793 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
2798 /* check if we must check any message/rfc822 attachments */
2800 uschar temp_path[1024];
2802 struct dirent *entry;
2805 snprintf(CS temp_path, 1024, "%s/scan/%s", spool_directory, message_id);
2807 tempdir = opendir(CS temp_path);
2810 entry = readdir(tempdir);
2811 if (entry == NULL) break;
2812 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0) {
2813 snprintf(CS rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
2814 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
2820 if (entry != NULL) {
2821 mbox_file = Ufopen(rfc822_file_path,"r");
2822 if (mbox_file == NULL) {
2823 log_write(0, LOG_PANIC,
2824 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
2825 unlink(CS rfc822_file_path);
2828 /* set RFC822 expansion variable */
2830 mime_part_count_buffer = mime_part_count;
2831 goto MIME_ACL_CHECK;
2836 add_acl_headers(US"MIME");
2839 recipients_count = 0;
2840 blackholed_by = US"MIME ACL";
2844 Uunlink(spool_name);
2846 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
2847 smtp_yield = FALSE; /* No more messsages after dropped connection */
2848 smtp_reply = US""; /* Indicate reply already sent */
2849 message_id[0] = 0; /* Indicate no message accepted */
2850 goto TIDYUP; /* Skip to end of function */
2855 #endif /* WITH_CONTENT_SCAN */
2858 if (acl_smtp_data != NULL && recipients_count > 0)
2860 uschar *user_msg, *log_msg;
2861 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
2862 add_acl_headers(US"DATA");
2865 recipients_count = 0;
2866 blackholed_by = US"DATA ACL";
2870 Uunlink(spool_name);
2871 #ifdef WITH_CONTENT_SCAN
2874 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
2875 smtp_yield = FALSE; /* No more messsages after dropped connection */
2876 smtp_reply = US""; /* Indicate reply already sent */
2877 message_id[0] = 0; /* Indicate no message accepted */
2878 goto TIDYUP; /* Skip to end of function */
2883 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
2884 we cannot take different actions for permanent and temporary rejections. */
2886 else if (acl_not_smtp != NULL)
2888 uschar *user_msg, *log_msg;
2889 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
2892 recipients_count = 0;
2893 blackholed_by = US"non-SMTP ACL";
2897 Uunlink(spool_name);
2898 log_write(0, LOG_MAIN|LOG_REJECT, "F=<%s> rejected by non-SMTP ACL: %s",
2899 sender_address, log_msg);
2900 if (user_msg == NULL) user_msg = US"local configuration problem";
2901 if (smtp_batched_input)
2903 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
2904 /* Does not return */
2908 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2909 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
2910 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
2912 /* Does not return */
2915 add_acl_headers(US"non-SMTP");
2918 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
2919 if (queue_only_policy) queued_by = US"ACL";
2921 enable_dollar_recipients = FALSE;
2924 #ifdef WITH_CONTENT_SCAN
2928 /* The final check on the message is to run the scan_local() function. The
2929 version supplied with Exim always accepts, but this is a hook for sysadmins to
2930 supply their own checking code. The local_scan() function is run even when all
2931 the recipients have been discarded. */
2933 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2935 /* Arrange to catch crashes in local_scan(), so that the -D file gets
2936 deleted, and the incident gets logged. */
2938 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
2939 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
2940 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
2941 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
2943 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
2944 local_scan_timeout);
2945 local_scan_data = NULL;
2947 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
2948 if (local_scan_timeout > 0) alarm(local_scan_timeout);
2949 rc = local_scan(data_fd, &local_scan_data);
2951 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2953 store_pool = POOL_MAIN; /* In case changed */
2954 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
2957 os_non_restarting_signal(SIGSEGV, SIG_DFL);
2958 os_non_restarting_signal(SIGFPE, SIG_DFL);
2959 os_non_restarting_signal(SIGILL, SIG_DFL);
2960 os_non_restarting_signal(SIGBUS, SIG_DFL);
2962 /* The length check is paranoia against some runaway code, and also because
2963 (for a success return) lines in the spool file are read into big_buffer. */
2965 if (local_scan_data != NULL)
2967 int len = Ustrlen(local_scan_data);
2968 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
2969 local_scan_data = string_copyn(local_scan_data, len);
2972 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
2974 if (!deliver_freeze) /* ACL might have already frozen */
2976 deliver_freeze = TRUE;
2977 deliver_frozen_at = time(NULL);
2978 frozen_by = US"local_scan()";
2980 rc = LOCAL_SCAN_ACCEPT;
2982 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
2984 if (!queue_only_policy) /* ACL might have already queued */
2986 queue_only_policy = TRUE;
2987 queued_by = US"local_scan()";
2989 rc = LOCAL_SCAN_ACCEPT;
2992 /* Message accepted: remove newlines in local_scan_data because otherwise
2993 the spool file gets corrupted. Ensure that all recipients are qualified. */
2995 if (rc == LOCAL_SCAN_ACCEPT)
2997 if (local_scan_data != NULL)
3000 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3002 for (i = 0; i < recipients_count; i++)
3004 recipient_item *r = recipients_list + i;
3005 r->address = rewrite_address_qualify(r->address, TRUE);
3006 if (r->errors_to != NULL)
3007 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3009 if (recipients_count == 0 && blackholed_by == NULL)
3010 blackholed_by = US"local_scan";
3013 /* Message rejected: newlines permitted in local_scan_data to generate
3014 multiline SMTP responses. */
3018 uschar *istemp = US"";
3024 errmsg = local_scan_data;
3026 Uunlink(spool_name); /* Cancel this message */
3030 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3031 "rejection given", rc);
3034 case LOCAL_SCAN_REJECT_NOLOGHDR:
3035 log_extra_selector &= ~LX_rejected_header;
3038 case LOCAL_SCAN_REJECT:
3040 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3043 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3044 log_extra_selector &= ~LX_rejected_header;
3047 case LOCAL_SCAN_TEMPREJECT:
3050 if (errmsg == NULL) errmsg = US"Temporary local problem";
3051 istemp = US"temporarily ";
3055 s = string_append(s, &size, &sptr, 2, US"F=",
3056 (sender_address[0] == 0)? US"<>" : sender_address);
3057 s = add_host_info_for_log(s, &size, &sptr);
3060 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3061 s, istemp, string_printing(errmsg));
3065 if (!smtp_batched_input)
3067 smtp_respond(code, TRUE, errmsg);
3068 message_id[0] = 0; /* Indicate no message accepted */
3069 smtp_reply = US""; /* Indicate reply already sent */
3070 goto TIDYUP; /* Skip to end of function */
3074 moan_smtp_batch(NULL, "%d %s", code, errmsg);
3075 /* Does not return */
3080 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3081 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3082 US"message rejected by local scan code: ", error_rc, data_file,
3084 /* Does not return */
3088 /* Reset signal handlers to ignore signals that previously would have caused
3089 the message to be abandoned. */
3091 signal(SIGTERM, SIG_IGN);
3092 signal(SIGINT, SIG_IGN);
3094 /* Ensure the first time flag is set in the newly-received message. */
3096 deliver_firsttime = TRUE;
3098 /* Update the timstamp in our Received: header to account for any time taken by
3099 an ACL or by local_scan(). The new time is the time that all reception
3100 processing is complete. */
3102 timestamp = expand_string(US"${tod_full}");
3103 tslen = Ustrlen(timestamp);
3105 memcpy(received_header->text + received_header->slen - tslen - 1,
3108 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3112 deliver_freeze = FALSE;
3113 queue_only_policy = FALSE;
3116 /* Keep the data file open until we have written the header file, in order to
3117 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3118 don't write the header file, and we unlink the data file. If writing the header
3119 file fails, we have failed to accept this message. */
3121 if (host_checking || blackholed_by != NULL)
3124 Uunlink(spool_name);
3125 msg_size = 0; /* Compute size for log line */
3126 for (h = header_list; h != NULL; h = h->next)
3127 if (h->type != '*') msg_size += h->slen;
3130 /* Write the -H file */
3134 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3136 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3137 Uunlink(spool_name); /* Lose the data file */
3141 smtp_reply = US"451 Error in writing spool file";
3142 message_id[0] = 0; /* Indicate no message accepted */
3147 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3148 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3150 /* Does not return */
3156 /* The message has now been successfully received. */
3158 receive_messagecount++;
3160 /* In SMTP sessions we may receive several in one connection. After each one,
3161 we wait for the clock to tick at the level of message-id granularity. This is
3162 so that the combination of time+pid is unique, even on systems where the pid
3163 can be re-used within our time interval. We can't shorten the interval without
3164 re-designing the message-id. See comments above where the message id is
3165 created. This is Something For The Future. */
3167 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3168 exim_wait_tick(&message_id_tv, id_resolution);
3170 /* Add data size to written header size. We do not count the initial file name
3171 that is in the file, but we do add one extra for the notional blank line that
3172 precedes the data. This total differs from message_size in that it include the
3173 added Received: header and any other headers that got created locally. */
3176 fstat(data_fd, &statbuf);
3178 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3180 /* Generate a "message received" log entry. We do this by building up a dynamic
3181 string as required. Since we commonly want to add two items at a time, use a
3182 macro to simplify the coding. We log the arrival of a new message while the
3183 file is still locked, just in case the machine is *really* fast, and delivers
3184 it first! Include any message id that is in the message - since the syntax of a
3185 message id is actually an addr-spec, we can use the parse routine to canonicize
3190 s = store_get(size);
3192 s = string_append(s, &size, &sptr, 2, US"<= ",
3193 (sender_address[0] == 0)? US"<>" : sender_address);
3194 if (message_reference != NULL)
3195 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3197 s = add_host_info_for_log(s, &size, &sptr);
3200 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3201 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3202 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3204 s = string_append(s, &size, &sptr, 2, US" CV=",
3205 tls_certificate_verified? "yes":"no");
3206 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3207 s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\"");
3210 if (sender_host_authenticated != NULL)
3212 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3213 if (authenticated_id != NULL)
3214 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3217 sprintf(CS big_buffer, "%d", msg_size);
3218 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3220 /* If an addr-spec in a message-id contains a quoted string, it can contain
3221 any characters except " \ and CR and so in particular it can contain NL!
3222 Therefore, make sure we use a printing-characters only version for the log.
3223 Also, allow for domain literals in the message id. */
3225 if (msgid_header != NULL)
3228 BOOL save_allow_domain_literals = allow_domain_literals;
3229 allow_domain_literals = TRUE;
3230 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3231 &errmsg, &start, &end, &domain, FALSE);
3232 allow_domain_literals = save_allow_domain_literals;
3234 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3237 /* If subject logging is turned on, create suitable printing-character
3238 text. By expanding $h_subject: we make use of the MIME decoding. */
3240 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3243 uschar *p = big_buffer;
3244 uschar *ss = expand_string(US"$h_subject:");
3246 /* Backslash-quote any double quotes or backslashes so as to make a
3247 a C-like string, and turn any non-printers into escape sequences. */
3250 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3252 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3257 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3260 /* Terminate the string: string_cat() and string_append() leave room, but do
3261 not put the zero in. */
3265 /* While writing to the log, set a flag to cause a call to receive_bomb_out()
3266 if the log cannot be opened. */
3268 receive_call_bombout = TRUE;
3269 log_write(0, LOG_MAIN |
3270 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3271 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3273 receive_call_bombout = FALSE;
3275 /* Log any control actions taken by an ACL or local_scan(). */
3277 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3278 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3279 "no immediate delivery: queued by %s", queued_by);
3281 /* Create a message log file if message logs are being used and this message is
3282 not blackholed. Write the reception stuff to it. We used to leave message log
3283 creation until the first delivery, but this has proved confusing for somep
3286 if (message_logs && blackholed_by == NULL)
3290 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3292 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3294 if (fd < 0 && errno == ENOENT)
3297 sprintf(CS temp, "msglog/%s", message_subdir);
3298 if (message_subdir[0] == 0) temp[6] = 0;
3299 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3300 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3305 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3306 spool_name, strerror(errno));
3311 FILE *message_log = fdopen(fd, "a");
3312 if (message_log == NULL)
3314 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3315 spool_name, strerror(errno));
3320 uschar *now = tod_stamp(tod_log);
3321 fprintf(message_log, "%s Received from %s\n", now, s+3);
3322 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3324 if (queue_only_policy) fprintf(message_log,
3325 "%s no immediate delivery: queued by %s\n", now, queued_by);
3326 fclose(message_log);
3331 store_reset(s); /* The store for the main log message can be reused */
3333 /* If the message is frozen, and freeze_tell is set, do the telling. */
3335 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3337 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3338 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3339 message_id, frozen_by, sender_address);
3343 /* Either a message has been successfully received and written to the two spool
3344 files, or an error in writing the spool has occurred for an SMTP message, or
3345 an SMTP message has been rejected because of a bad sender. (For a non-SMTP
3346 message we will have already given up because there's no point in carrying on!)
3347 In either event, we must now close (and thereby unlock) the data file. In the
3348 successful case, this leaves the message on the spool, ready for delivery. In
3349 the error case, the spool file will be deleted. Then tidy up store, interact
3350 with an SMTP call if necessary, and return.
3352 A fflush() was done earlier in the expectation that any write errors on the
3353 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3354 possible for fclose() to fail - but what to do? What has happened to the lock
3358 process_info[process_info_len] = 0; /* Remove message id */
3359 if (data_file != NULL) fclose(data_file); /* Frees the lock */
3361 /* Now reset signal handlers to their defaults */
3363 signal(SIGTERM, SIG_DFL);
3364 signal(SIGINT, SIG_DFL);
3366 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3367 value, which defaults TRUE - meaning there may be more incoming messages from
3368 this connection. For non-SMTP callers (where there is only ever one message),
3369 the default is FALSE. */
3375 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3376 is set to the response. However, after an ACL error or local_scan() error,
3377 the response has already been sent, and smtp_reply is an empty string to
3380 if (!smtp_batched_input)
3382 if (smtp_reply == NULL)
3384 #ifndef WITH_CONTENT_SCAN
3385 smtp_printf("250 OK id=%s\r\n", message_id);
3389 smtp_printf("550-FAKE_REJECT id=%s\r\n", message_id);
3390 smtp_printf("550-Your message has been rejected but is being kept for evaluation.\r\n");
3391 smtp_printf("550 If it was a legit message, it may still be delivered to the target recipient(s).\r\n");
3394 smtp_printf("250 OK id=%s\r\n", message_id);
3398 "\n**** SMTP testing: that is not a real message id!\n\n");
3400 #ifndef WITH_CONTENT_SCAN
3401 else if (smtp_reply[0] != 0) smtp_printf("%.1024s\r\n", smtp_reply);
3403 else if (smtp_reply[0] != 0)
3405 if (fake_reject && (smtp_reply[0] == '2'))
3407 smtp_printf("550-FAKE_REJECT id=%s\r\n", message_id);
3408 smtp_printf("550-Your message has been rejected but is being kept for evaluation.\r\n");
3409 smtp_printf("550 If it was a legit message, it may still be delivered to the target recipient(s).\r\n");
3412 smtp_printf("%.1024s\r\n", smtp_reply);
3417 /* For batched SMTP, generate an error message on failure, and do
3418 nothing on success. The function moan_smtp_batch() does not return -
3419 it exits from the program with a non-zero return code. */
3421 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
3425 /* If blackholing, we can immediately log this message's sad fate. The data
3426 file has already been unlinked, and the header file was never written to disk.
3427 We must now indicate that nothing was received, to prevent a delivery from
3430 if (blackholed_by != NULL)
3432 uschar *detail = (local_scan_data != NULL)?
3433 string_printing(local_scan_data) :
3434 string_sprintf("(%s discarded recipients)", blackholed_by);
3435 log_write(0, LOG_MAIN, "=> blackhole %s", detail);
3436 log_write(0, LOG_MAIN, "Completed");
3440 /* Reset headers so that logging of rejects for a subsequent message doesn't
3441 include them. It is also important to set header_last = NULL before exiting
3442 from this function, as this prevents certain rewrites that might happen during
3443 subsequent verifying (of another incoming message) from trying to add headers
3444 when they shouldn't. */
3446 header_list = header_last = NULL;
3448 return yield; /* TRUE if more messages (SMTP only) */
3451 /* End of receive.c */