1 /* $Cambridge: exim/src/src/receive.c,v 1.16 2005/04/27 13:29:32 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
8 /* See the file NOTICE for conditions of use and distribution. */
10 /* Code for receiving a message and setting up spool files. */
14 #ifdef EXPERIMENTAL_DOMAINKEYS
15 #define RECEIVE_GETC dk_receive_getc
16 #define RECEIVE_UNGETC dk_receive_ungetc
18 #define RECEIVE_GETC receive_getc
19 #define RECEIVE_UNGETC receive_ungetc
22 /*************************************************
23 * Local static variables *
24 *************************************************/
26 static FILE *data_file = NULL;
27 static int data_fd = -1;
28 static uschar spool_name[256];
32 /*************************************************
33 * Non-SMTP character reading functions *
34 *************************************************/
36 /* These are the default functions that are set up in the variables such as
37 receive_getc initially. They just call the standard functions, passing stdin as
38 the file. (When SMTP input is occurring, different functions are used by
39 changing the pointer variables.) */
50 return ungetc(c, stdin);
68 /*************************************************
69 * Check that a set sender is allowed *
70 *************************************************/
72 /* This function is called when a local caller sets an explicit sender address.
73 It checks whether this is permitted, which it is for trusted callers.
74 Otherwise, it must match the pattern(s) in untrusted_set_sender.
76 Arguments: the proposed sender address
77 Returns: TRUE for a trusted caller
78 TRUE if the address has been set, untrusted_set_sender has been
79 set, and the address matches something in the list
84 receive_check_set_sender(uschar *newsender)
87 if (trusted_caller) return TRUE;
88 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
89 qnewsender = (Ustrchr(newsender, '@') != NULL)?
90 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
92 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
99 /*************************************************
100 * Read space info for a partition *
101 *************************************************/
103 /* This function is called by receive_check_fs() below, and also by string
104 expansion for variables such as $spool_space. The field names for the statvfs
105 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
106 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
107 have inodes, and they return -1 for the number available.
109 Later: It turns out that some file systems that do not have the concept of
110 inodes return 0 rather than -1. Such systems should also return 0 for the total
111 number of inodes, so we require that to be greater than zero before returning
115 isspool TRUE for spool partition, FALSE for log partition
116 inodeptr address of int to receive inode count; -1 if there isn't one
118 Returns: available on-root space, in kilobytes
119 -1 for log partition if there isn't one
121 All values are -1 if the STATFS functions are not available.
125 receive_statvfs(BOOL isspool, int *inodeptr)
128 struct STATVFS statbuf;
133 /* The spool directory must always exist. */
137 path = spool_directory;
141 /* Need to cut down the log file path to the directory, and to ignore any
142 appearance of "syslog" in it. */
146 int sep = ':'; /* Not variable - outside scripts use */
147 uschar *p = log_file_path;
150 /* An empty log_file_path means "use the default". This is the same as an
151 empty item in a list. */
153 if (*p == 0) p = US":";
154 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
156 if (Ustrcmp(path, "syslog") != 0) break;
159 if (path == NULL) /* No log files */
165 /* An empty string means use the default, which is in the spool directory.
166 But don't just use the spool directory, as it is possible that the log
167 subdirectory has been symbolically linked elsewhere. */
171 sprintf(CS buffer, CS"%s/log", CS spool_directory);
177 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
181 /* We now have the patch; do the business */
183 memset(&statbuf, 0, sizeof(statbuf));
185 if (STATVFS(CS path, &statbuf) != 0)
187 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
188 "%s directory %s: %s", name, spool_directory, strerror(errno));
189 smtp_closedown(US"spool or log directory problem");
190 exim_exit(EXIT_FAILURE);
193 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
195 /* Disks are getting huge. Take care with computing the size in kilobytes. */
197 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
199 /* Unable to find partition sizes in this environment. */
210 /*************************************************
211 * Check space on spool and log partitions *
212 *************************************************/
214 /* This function is called before accepting a message; if any thresholds are
215 set, it checks them. If a message_size is supplied, it checks that there is
216 enough space for that size plus the threshold - i.e. that the message won't
217 reduce the space to the threshold. Not all OS have statvfs(); for those that
218 don't, this function always returns TRUE. For some OS the old function and
219 struct name statfs is used; that is handled by a macro, defined in exim.h.
222 msg_size the (estimated) size of an incoming message
224 Returns: FALSE if there isn't enough space, or if the information cannot
226 TRUE if no check was done or there is enough space
230 receive_check_fs(int msg_size)
234 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
236 space = receive_statvfs(TRUE, &inodes);
239 debug_printf("spool directory space = %dK inodes = %d "
240 "check_space = %dK inodes = %d msg_size = %d\n",
241 space, inodes, check_spool_space, check_spool_inodes, msg_size);
243 if ((space >= 0 && space < check_spool_space) ||
244 (inodes >= 0 && inodes < check_spool_inodes))
246 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
247 "inodes=%d", space, inodes);
252 if (check_log_space > 0 || check_log_inodes > 0)
254 space = receive_statvfs(FALSE, &inodes);
257 debug_printf("log directory space = %dK inodes = %d "
258 "check_space = %dK inodes = %d\n",
259 space, inodes, check_log_space, check_log_inodes);
261 if ((space >= 0 && space < check_log_space) ||
262 (inodes >= 0 && inodes < check_log_inodes))
264 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
265 "inodes=%d", space, inodes);
275 /*************************************************
276 * Bomb out while reading a message *
277 *************************************************/
279 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
280 received, or if there is a timeout. A rarer case might be if the log files are
281 screwed up and Exim can't open them to record a message's arrival. Handling
282 that case is done by setting a flag to cause the log functions to call this
283 function if there is an ultimate disaster. That is why it is globally
286 Arguments: SMTP response to give if in an SMTP session
291 receive_bomb_out(uschar *msg)
293 /* If spool_name is set, it contains the name of the data file that is being
294 written. Unlink it before closing so that it cannot be picked up by a delivery
295 process. Ensure that any header file is also removed. */
297 if (spool_name[0] != 0)
300 spool_name[Ustrlen(spool_name) - 1] = 'H';
304 /* Now close the file if it is open, either as a fd or a stream. */
306 if (data_file != NULL) fclose(data_file);
307 else if (data_fd >= 0) close(data_fd);
309 /* Attempt to close down an SMTP connection tidily. */
313 if (!smtp_batched_input)
315 smtp_printf("421 %s %s - closing connection.\r\n", smtp_active_hostname,
320 /* Control does not return from moan_smtp_batch(). */
322 else moan_smtp_batch(NULL, "421 %s - message abandoned", msg);
325 /* Exit from the program (non-BSMTP cases) */
327 exim_exit(EXIT_FAILURE);
331 /*************************************************
332 * Data read timeout *
333 *************************************************/
335 /* Handler function for timeouts that occur while reading the data that
338 Argument: the signal number
343 data_timeout_handler(int sig)
347 sig = sig; /* Keep picky compilers happy */
351 msg = US"SMTP incoming data timeout";
352 log_write(L_lost_incoming_connection,
353 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
355 (sender_fullhost != NULL)? sender_fullhost : US"local process",
360 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
361 log_write(L_lost_incoming_connection,
362 LOG_MAIN, "timed out while reading local message");
365 receive_bomb_out(msg); /* Does not return */
370 /*************************************************
371 * local_scan() timeout *
372 *************************************************/
374 /* Handler function for timeouts that occur while running a local_scan()
377 Argument: the signal number
382 local_scan_timeout_handler(int sig)
384 sig = sig; /* Keep picky compilers happy */
385 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
386 "message temporarily rejected (size %d)", message_size);
387 receive_bomb_out(US"local verification problem"); /* Does not return */
392 /*************************************************
393 * local_scan() crashed *
394 *************************************************/
396 /* Handler function for signals that occur while running a local_scan()
399 Argument: the signal number
404 local_scan_crash_handler(int sig)
406 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
407 "signal %d - message temporarily rejected (size %d)", sig, message_size);
408 receive_bomb_out(US"local verification problem"); /* Does not return */
412 /*************************************************
413 * SIGTERM or SIGINT received *
414 *************************************************/
416 /* Handler for SIGTERM or SIGINT signals that occur while reading the
417 data that comprises a message.
419 Argument: the signal number
424 data_sigterm_sigint_handler(int sig)
430 msg = US"Service not available - SIGTERM or SIGINT received";
431 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
432 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
436 if (filter_test == FTEST_NONE)
438 fprintf(stderr, "\nexim: %s received - message abandoned\n",
439 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
440 log_write(0, LOG_MAIN, "%s received while reading local message",
441 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
445 receive_bomb_out(msg); /* Does not return */
450 /*************************************************
451 * Add new recipient to list *
452 *************************************************/
454 /* This function builds a list of recipient addresses in argc/argv
458 recipient the next address to add to recipients_list
459 pno parent number for fixed aliases; -1 otherwise
465 receive_add_recipient(uschar *recipient, int pno)
467 if (recipients_count >= recipients_list_max)
469 recipient_item *oldlist = recipients_list;
470 int oldmax = recipients_list_max;
471 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
472 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
474 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
477 recipients_list[recipients_count].address = recipient;
478 recipients_list[recipients_count].pno = pno;
479 #ifdef EXPERIMENTAL_BRIGHTMAIL
480 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
481 /* reset optin string pointer for next recipient */
482 bmi_current_optin = NULL;
484 recipients_list[recipients_count++].errors_to = NULL;
490 /*************************************************
491 * Remove a recipient from the list *
492 *************************************************/
494 /* This function is provided for local_scan() to use.
497 recipient address to remove
499 Returns: TRUE if it did remove something; FALSE otherwise
503 receive_remove_recipient(uschar *recipient)
506 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
508 for (count = 0; count < recipients_count; count++)
510 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
512 if ((--recipients_count - count) > 0)
513 memmove(recipients_list + count, recipients_list + count + 1,
514 (recipients_count - count)*sizeof(recipient_item));
525 /*************************************************
526 * Read data portion of a non-SMTP message *
527 *************************************************/
529 /* This function is called to read the remainder of a message (following the
530 header) when the input is not from SMTP - we are receiving a local message on
531 a standard input stream. The message is always terminated by EOF, and is also
532 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
533 two cases for maximum efficiency.
535 Ensure that the body ends with a newline. This will naturally be the case when
536 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
537 as "sequences of lines" - this of course strictly applies only to SMTP, but
538 deliveries into BSD-type mailbox files also require it. Exim used to have a
539 flag for doing this at delivery time, but as it was always set for all
540 transports, I decided to simplify things by putting the check here instead.
542 There is at least one MUA (dtmail) that sends CRLF via this interface, and
543 other programs are known to do this as well. Exim used to have a option for
544 dealing with this: in July 2003, after much discussion, the code has been
545 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
547 However, for the case when a dot on a line by itself terminates a message, the
548 only recognized terminating sequences before and after the dot are LF and CRLF.
549 Otherwise, having read EOL . CR, you don't know whether to read another
552 Internally, in messages stored in Exim's spool files, LF is used as the line
553 terminator. Under the new regime, bare CRs will no longer appear in these
557 fout a FILE to which to write the message
559 Returns: One of the END_xxx values indicating why it stopped reading
563 read_message_data(FILE *fout)
568 /* Handle the case when only EOF terminates the message */
572 register int last_ch = '\n';
574 for (; (ch = (RECEIVE_GETC)()) != EOF; last_ch = ch)
576 if (ch == 0) body_zerocount++;
577 if (last_ch == '\r' && ch != '\n')
579 if (fputc('\n', fout) == EOF) return END_WERROR;
583 if (ch == '\r') continue;
585 if (fputc(ch, fout) == EOF) return END_WERROR;
586 if (ch == '\n') body_linecount++;
587 if (++message_size > thismessage_size_limit) return END_SIZE;
592 if (fputc('\n', fout) == EOF) return END_WERROR;
600 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
604 while ((ch = (RECEIVE_GETC)()) != EOF)
606 if (ch == 0) body_zerocount++;
609 case 0: /* Normal state (previous char written) */
611 { body_linecount++; ch_state = 1; }
613 { ch_state = 2; continue; }
616 case 1: /* After written "\n" */
617 if (ch == '.') { ch_state = 3; continue; }
618 if (ch != '\n') ch_state = 0;
622 body_linecount++; /* After unwritten "\r" */
627 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
628 if (ch == '\r') continue;
633 case 3: /* After "\n." (\n written, dot not) */
634 if (ch == '\n') return END_DOT;
635 if (ch == '\r') { ch_state = 4; continue; }
637 if (fputc('.', fout) == EOF) return END_WERROR;
641 case 4: /* After "\n.\r" (\n written, rest not) */
642 if (ch == '\n') return END_DOT;
645 if (fputs(".\n", fout) == EOF) return END_WERROR;
646 if (ch == '\r') { ch_state = 2; continue; }
651 if (fputc(ch, fout) == EOF) return END_WERROR;
652 if (++message_size > thismessage_size_limit) return END_SIZE;
655 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
656 the message ends with a newline, and we must also write any characters that
657 were saved up while testing for an ending dot. */
661 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
662 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
663 message_size += Ustrlen(ends[ch_state]);
673 /*************************************************
674 * Read data portion of an SMTP message *
675 *************************************************/
677 /* This function is called to read the remainder of an SMTP message (after the
678 headers), or to skip over it when an error has occurred. In this case, the
679 output file is passed as NULL.
681 If any line begins with a dot, that character is skipped. The input should only
682 be successfully terminated by CR LF . CR LF unless it is local (non-network)
683 SMTP, in which case the CRs are optional, but...
685 FUDGE: It seems that sites on the net send out messages with just LF
686 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
687 we make the CRs optional in all cases.
689 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
690 well, so that there are no CRs in spooled messages. However, the message
691 terminating dot is not recognized between two bare CRs.
694 fout a FILE to which to write the message; NULL if skipping
696 Returns: One of the END_xxx values indicating why it stopped reading
700 read_message_data_smtp(FILE *fout)
705 while ((ch = (RECEIVE_GETC)()) != EOF)
707 if (ch == 0) body_zerocount++;
710 case 0: /* After LF or CRLF */
714 continue; /* Don't ever write . after LF */
718 /* Else fall through to handle as normal uschar. */
720 case 1: /* Normal state */
733 case 2: /* After (unwritten) CR */
742 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
743 if (ch != '\r') ch_state = 1; else continue;
747 case 3: /* After [CR] LF . */
755 ch_state = 1; /* The dot itself is removed */
758 case 4: /* After [CR] LF . CR */
759 if (ch == '\n') return END_DOT;
762 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
772 /* Add the character to the spool file, unless skipping; then loop for the
778 if (fputc(ch, fout) == EOF) return END_WERROR;
779 if (message_size > thismessage_size_limit) return END_SIZE;
783 /* Fall through here if EOF encountered. This indicates some kind of error,
784 since a correct message is terminated by [CR] LF . [CR] LF. */
792 /*************************************************
793 * Swallow SMTP message *
794 *************************************************/
796 /* This function is called when there has been some kind of error while reading
797 an SMTP message, and the remaining data may need to be swallowed. It is global
798 because it is called from smtp_closedown() to shut down an incoming call
801 Argument: a FILE from which to read the message
806 receive_swallow_smtp(void)
808 if (message_ended >= END_NOTENDED)
809 message_ended = read_message_data_smtp(NULL);
814 /*************************************************
815 * Handle lost SMTP connection *
816 *************************************************/
818 /* This function logs connection loss incidents and generates an appropriate
821 Argument: additional data for the message
822 Returns: the SMTP response
826 handle_lost_connection(uschar *s)
828 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
829 "%s lost while reading message data%s", smtp_get_connection_info(), s);
830 return US"421 Lost incoming connection";
836 /*************************************************
837 * Handle a non-smtp reception error *
838 *************************************************/
840 /* This function is called for various errors during the reception of non-SMTP
841 messages. It either sends a message to the sender of the problem message, or it
842 writes to the standard error stream.
845 errcode code for moan_to_sender(), identifying the error
846 text1 first message text, passed to moan_to_sender()
847 text2 second message text, used only for stderrr
848 error_rc code to pass to exim_exit if no problem
849 f FILE containing body of message (may be stdin)
850 hptr pointer to instore headers or NULL
852 Returns: calls exim_exit(), which does not return
856 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
857 FILE *f, header_line *hptr)
859 if (error_handling == ERRORS_SENDER)
863 eblock.text1 = text1;
864 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
865 error_rc = EXIT_FAILURE;
867 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
874 /*************************************************
875 * Add header lines set up by ACL *
876 *************************************************/
878 /* This function is called to add the header lines that were set up by "warn"
879 statements in an ACL onto the list of headers in memory. It is done in two
880 stages like this, because when the ACL for RCPT is running, the other headers
881 have not yet been received. This function is called twice; once just before
882 running the DATA ACL, and once after. This is so that header lines added by
883 MAIL or RCPT are visible to the DATA ACL.
885 Originally these header lines were added at the end. Now there is support for
886 three different places: top, bottom, and after the Received: header(s). There
887 will always be at least one Received: header, even if it is marked deleted, and
888 even if something else has been put in front of it.
891 acl_name text to identify which ACL
897 add_acl_headers(uschar *acl_name)
899 header_line *h, *next;
900 header_line *last_received = NULL;
902 if (acl_warn_headers == NULL) return;
903 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
905 for (h = acl_warn_headers; h != NULL; h = next)
912 h->next = header_list;
914 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
918 if (last_received == NULL)
920 last_received = header_list;
921 while (!header_testname(last_received, US"Received", 8, FALSE))
922 last_received = last_received->next;
923 while (last_received->next != NULL &&
924 header_testname(last_received->next, US"Received", 8, FALSE))
925 last_received = last_received->next;
927 h->next = last_received->next;
928 last_received->next = h;
929 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
933 /* add header before any header which is NOT Received: or Resent- */
934 last_received = header_list;
935 while ( (last_received->next != NULL) &&
936 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
937 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
938 last_received = last_received->next;
939 /* last_received now points to the last Received: or Resent-* header
940 in an uninterrupted chain of those header types (seen from the beginning
941 of all headers. Our current header must follow it. */
942 h->next = last_received->next;
943 last_received->next = h;
944 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
949 header_last->next = h;
953 if (h->next == NULL) header_last = h;
955 /* Check for one of the known header types (From:, To:, etc.) though in
956 practice most added headers are going to be "other". Lower case
957 identification letters are never stored with the header; they are used
958 for existence tests when messages are received. So discard any lower case
961 h->type = header_checkname(h, FALSE);
962 if (h->type >= 'a') h->type = htype_other;
964 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
967 acl_warn_headers = NULL;
968 DEBUG(D_receive|D_acl) debug_printf(">>\n");
973 /*************************************************
974 * Add host information for log line *
975 *************************************************/
977 /* Called for acceptance and rejecting log lines. This adds information about
978 the calling host to a string that is being built dynamically.
982 sizeptr points to the size variable
983 ptrptr points to the pointer variable
985 Returns: the extended string
989 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
991 if (sender_fullhost != NULL)
993 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
994 if ((log_extra_selector & LX_incoming_interface) != 0 &&
995 interface_address != NULL)
997 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
999 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1002 if (sender_ident != NULL)
1003 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1004 if (received_protocol != NULL)
1005 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1011 #ifdef WITH_CONTENT_SCAN
1013 /*************************************************
1014 * Run the MIME ACL on a message *
1015 *************************************************/
1017 /* This code is in a subroutine so that it can be used for both SMTP
1018 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1021 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1022 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1023 smtp_reply_ptr Where SMTP reply is being built
1024 blackholed_by_ptr Where "blackholed by" message is being built
1026 Returns: TRUE to carry on; FALSE to abandon the message
1030 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1031 uschar **blackholed_by_ptr)
1034 uschar rfc822_file_path[2048];
1035 unsigned long mbox_size;
1036 header_line *my_headerlist;
1037 uschar *user_msg, *log_msg;
1038 int mime_part_count_buffer = -1;
1041 memset(CS rfc822_file_path,0,2048);
1043 /* check if it is a MIME message */
1044 my_headerlist = header_list;
1045 while (my_headerlist != NULL) {
1046 /* skip deleted headers */
1047 if (my_headerlist->type == '*') {
1048 my_headerlist = my_headerlist->next;
1051 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0) {
1052 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1055 my_headerlist = my_headerlist->next;
1058 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1062 /* make sure the eml mbox file is spooled up */
1063 mbox_file = spool_mbox(&mbox_size);
1064 if (mbox_file == NULL) {
1065 /* error while spooling */
1066 log_write(0, LOG_MAIN|LOG_PANIC,
1067 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1068 Uunlink(spool_name);
1070 smtp_respond(451, TRUE, US"temporary local problem");
1071 message_id[0] = 0; /* Indicate no message accepted */
1072 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1073 return FALSE; /* Indicate skip to end of receive function */
1079 mime_part_count = -1;
1080 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1083 if (Ustrlen(rfc822_file_path) > 0) {
1084 mime_part_count = mime_part_count_buffer;
1086 if (unlink(CS rfc822_file_path) == -1) {
1087 log_write(0, LOG_PANIC,
1088 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1093 /* check if we must check any message/rfc822 attachments */
1095 uschar temp_path[1024];
1097 struct dirent *entry;
1100 snprintf(CS temp_path, 1024, "%s/scan/%s", spool_directory, message_id);
1102 tempdir = opendir(CS temp_path);
1105 entry = readdir(tempdir);
1106 if (entry == NULL) break;
1107 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0) {
1108 snprintf(CS rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1109 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1115 if (entry != NULL) {
1116 mbox_file = Ufopen(rfc822_file_path,"r");
1117 if (mbox_file == NULL) {
1118 log_write(0, LOG_PANIC,
1119 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1120 unlink(CS rfc822_file_path);
1123 /* set RFC822 expansion variable */
1125 mime_part_count_buffer = mime_part_count;
1126 goto MIME_ACL_CHECK;
1131 add_acl_headers(US"MIME");
1134 recipients_count = 0;
1135 *blackholed_by_ptr = US"MIME ACL";
1139 Uunlink(spool_name);
1141 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1142 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1143 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1144 message_id[0] = 0; /* Indicate no message accepted */
1145 return FALSE; /* Cause skip to end of receive function */
1151 #endif /* WITH_CONTENT_SCAN */
1154 /*************************************************
1156 *************************************************/
1158 /* Receive a message on the given input, and put it into a pair of spool files.
1159 Either a non-null list of recipients, or the extract flag will be true, or
1160 both. The flag sender_local is true for locally generated messages. The flag
1161 submission_mode is true if an ACL has obeyed "control = submission". The flag
1162 smtp_input is true if the message is to be handled using SMTP conventions about
1163 termination and lines starting with dots. For non-SMTP messages, dot_ends is
1164 true for dot-terminated messages.
1166 If a message was successfully read, message_id[0] will be non-zero.
1168 The general actions of this function are:
1170 . Read the headers of the message (if any) into a chain of store
1173 . If there is a "sender:" header and the message is locally originated,
1174 throw it away, unless the caller is trusted, or unless
1175 active_local_sender_retain is set - which can only happen if
1176 active_local_from_check is false.
1178 . If recipients are to be extracted from the message, build the
1179 recipients list from the headers, removing any that were on the
1180 original recipients list (unless extract_addresses_remove_arguments is
1181 false), and at the same time, remove any bcc header that may be present.
1183 . Get the spool file for the data, sort out its unique name, open
1184 and lock it (but don't give it the name yet).
1186 . Generate a "Message-Id" header if the message doesn't have one, for
1187 locally-originated messages.
1189 . Generate a "Received" header.
1191 . Ensure the recipients list is fully qualified and rewritten if necessary.
1193 . If there are any rewriting rules, apply them to the sender address
1194 and also to the headers.
1196 . If there is no from: header, generate one, for locally-generated messages
1197 and messages in "submission mode" only.
1199 . If the sender is local, check that from: is correct, and if not, generate
1200 a Sender: header, unless message comes from a trusted caller, or this
1201 feature is disabled by active_local_from_check being false.
1203 . If there is no "date" header, generate one, for locally-originated
1204 or submission mode messages only.
1206 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1207 dot_ends mode, to the data file. Leave it open, to hold the lock.
1209 . Write the envelope and the headers to a new file.
1211 . Set the name for the header file; close it.
1213 . Set the name for the data file; close it.
1215 Because this function can potentially be called many times in a single
1216 SMTP connection, all store should be got by store_get(), so that it will be
1217 automatically retrieved after the message is accepted.
1219 FUDGE: It seems that sites on the net send out messages with just LF
1220 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1221 we make the CRs optional in all cases.
1223 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1224 new regime is now in place in which bare CRs in header lines are turned into LF
1225 followed by a space, so as not to terminate the header line.
1227 February 2004: A bare LF in a header line in a message whose first line was
1228 terminated by CRLF is treated in the same way as a bare CR.
1231 extract_recip TRUE if recipients are to be extracted from the message's
1234 Returns: TRUE there are more messages to be read (SMTP input)
1235 FALSE there are no more messages to be read (non-SMTP input
1236 or SMTP connection collapsed, or other failure)
1238 When reading a message for filter testing, the returned value indicates
1239 whether the headers (which is all that is read) were terminated by '.' or
1243 receive_msg(BOOL extract_recip)
1247 int process_info_len = Ustrlen(process_info);
1248 int error_rc = (error_handling == ERRORS_SENDER)?
1249 errors_sender_rc : EXIT_FAILURE;
1250 int header_size = 256;
1251 int start, end, domain, size, sptr;
1255 register int ptr = 0;
1257 BOOL contains_resent_headers = FALSE;
1258 BOOL extracted_ignored = FALSE;
1259 BOOL first_line_ended_crlf = TRUE_UNSET;
1260 BOOL smtp_yield = TRUE;
1263 BOOL resents_exist = FALSE;
1264 uschar *resent_prefix = US"";
1265 uschar *blackholed_by = NULL;
1266 uschar *blackhole_log_msg = US"";
1269 error_block *bad_addresses = NULL;
1271 uschar *frozen_by = NULL;
1272 uschar *queued_by = NULL;
1275 struct stat statbuf;
1277 /* Final message to give to SMTP caller */
1279 uschar *smtp_reply = NULL;
1281 /* Working header pointers */
1283 header_line *h, *next;
1285 /* Flags for noting the existence of certain headers */
1287 /**** No longer check for these (Nov 2003)
1288 BOOL to_or_cc_header_exists = FALSE;
1289 BOOL bcc_header_exists = FALSE;
1292 BOOL date_header_exists = FALSE;
1294 /* Pointers to receive the addresses of headers whose contents we need. */
1296 header_line *from_header = NULL;
1297 header_line *subject_header = NULL;
1298 header_line *msgid_header = NULL;
1299 header_line *received_header;
1301 /* Variables for use when building the Received: header. */
1307 /* Release any open files that might have been cached while preparing to
1308 accept the message - e.g. by verifying addresses - because reading a message
1309 might take a fair bit of real time. */
1313 /* Initialize the chain of headers by setting up a place-holder for Received:
1314 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1315 pointing to the end of the chain to make adding headers simple. */
1317 received_header = header_list = header_last = store_get(sizeof(header_line));
1318 header_list->next = NULL;
1319 header_list->type = htype_old;
1320 header_list->text = NULL;
1321 header_list->slen = 0;
1323 /* Control block for the next header to be read. */
1325 next = store_get(sizeof(header_line));
1326 next->text = store_get(header_size);
1328 /* Initialize message id to be null (indicating no message read), and the
1329 header names list to be the normal list. Indicate there is no data file open
1330 yet, initialize the size and warning count, and deal with no size limit. */
1338 received_count = 1; /* For the one we will add */
1340 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1342 /* While reading the message, the following counts are computed. */
1344 message_linecount = body_linecount = body_zerocount = 0;
1346 #ifdef EXPERIMENTAL_DOMAINKEYS
1347 /* Call into DK to set up the context. Check if DK is to be run are carried out
1348 inside dk_exim_verify_init(). */
1349 dk_exim_verify_init();
1352 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1353 ids, and fractions of a second are required. See the comments that precede the
1354 message id creation below. */
1356 (void)gettimeofday(&message_id_tv, NULL);
1358 /* For other uses of the received time we can operate with granularity of one
1359 second, and for that we use the global variable received_time. This is for
1360 things like ultimate message timeouts. */
1362 received_time = message_id_tv.tv_sec;
1364 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1365 happen in the smtp_getc() function when it refills its buffer. */
1367 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1369 /* If not SMTP input, timeout happens only if configured, and we just set a
1370 single timeout for the whole message. */
1372 else if (receive_timeout > 0)
1374 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1375 alarm(receive_timeout);
1378 /* SIGTERM and SIGINT are caught always. */
1380 signal(SIGTERM, data_sigterm_sigint_handler);
1381 signal(SIGINT, data_sigterm_sigint_handler);
1383 /* Header lines in messages are not supposed to be very long, though when
1384 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1385 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1386 storing the header, and extend this as necessary using string_cat().
1388 To cope with total lunacies, impose an upper limit on the length of the header
1389 section of the message, as otherwise the store will fill up. We must also cope
1390 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1391 Folded header lines are joined into one string, leaving the '\n' characters
1392 inside them, so that writing them out reproduces the input.
1394 Loop for each character of each header; the next structure for chaining the
1395 header is set up already, with ptr the offset of the next character in
1400 int ch = (RECEIVE_GETC)();
1402 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1403 SMTP must have a correct "." terminator. */
1405 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1407 smtp_reply = handle_lost_connection(US" (header)");
1409 goto TIDYUP; /* Skip to end of function */
1412 /* See if we are at the current header's size limit - there must be at least
1413 four bytes left. This allows for the new character plus a zero, plus two for
1414 extra insertions when we are playing games with dots and carriage returns. If
1415 we are at the limit, extend the text buffer. This could have been done
1416 automatically using string_cat() but because this is a tightish loop storing
1417 only one character at a time, we choose to do it inline. Normally
1418 store_extend() will be able to extend the block; only at the end of a big
1419 store block will a copy be needed. To handle the case of very long headers
1420 (and sometimes lunatic messages can have ones that are 100s of K long) we
1421 call store_release() for strings that have been copied - if the string is at
1422 the start of a block (and therefore the only thing in it, because we aren't
1423 doing any other gets), the block gets freed. We can only do this because we
1424 know there are no other calls to store_get() going on. */
1426 if (ptr >= header_size - 4)
1428 int oldsize = header_size;
1429 /* header_size += 256; */
1431 if (!store_extend(next->text, oldsize, header_size))
1433 uschar *newtext = store_get(header_size);
1434 memcpy(newtext, next->text, ptr);
1435 store_release(next->text);
1436 next->text = newtext;
1440 /* Cope with receiving a binary zero. There is dispute about whether
1441 these should be allowed in RFC 822 messages. The middle view is that they
1442 should not be allowed in headers, at least. Exim takes this attitude at
1443 the moment. We can't just stomp on them here, because we don't know that
1444 this line is a header yet. Set a flag to cause scanning later. */
1446 if (ch == 0) had_zero++;
1448 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1449 those from data files use just LF. Treat LF in local SMTP input as a
1450 terminator too. Treat EOF as a line terminator always. */
1452 if (ch == EOF) goto EOL;
1454 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1455 other MTAs accept this. We are therefore forced into this "liberalisation"
1456 too, so we accept LF as a line terminator whatever the source of the message.
1457 However, if the first line of the message ended with a CRLF, we treat a bare
1458 LF specially by inserting a white space after it to ensure that the header
1459 line is not terminated. */
1463 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1464 else if (first_line_ended_crlf) RECEIVE_UNGETC(' ');
1468 /* This is not the end of the line. If this is SMTP input and this is
1469 the first character in the line and it is a "." character, ignore it.
1470 This implements the dot-doubling rule, though header lines starting with
1471 dots aren't exactly common. They are legal in RFC 822, though. If the
1472 following is CRLF or LF, this is the line that that terminates the
1473 entire message. We set message_ended to indicate this has happened (to
1474 prevent further reading), and break out of the loop, having freed the
1475 empty header, and set next = NULL to indicate no data line. */
1477 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1479 ch = (RECEIVE_GETC)();
1482 ch = (RECEIVE_GETC)();
1486 ch = '\r'; /* Revert to CR */
1491 message_ended = END_DOT;
1494 break; /* End character-reading loop */
1497 /* For non-SMTP input, the dot at the start of the line was really a data
1498 character. What is now in ch is the following character. We guaranteed
1499 enough space for this above. */
1503 next->text[ptr++] = '.';
1508 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1509 remember this case if this is the first line ending. */
1513 ch = (RECEIVE_GETC)();
1516 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1520 /* Otherwise, put back the character after CR, and turn the bare CR
1523 ch = (RECEIVE_UNGETC)(ch);
1524 next->text[ptr++] = '\n';
1529 /* We have a data character for the header line. */
1531 next->text[ptr++] = ch; /* Add to buffer */
1532 message_size++; /* Total message size so far */
1534 /* Handle failure due to a humungously long header section. The >= allows
1535 for the terminating \n. Add what we have so far onto the headers list so
1536 that it gets reflected in any error message, and back up the just-read
1539 if (message_size >= header_maxsize)
1541 next->text[ptr] = 0;
1543 next->type = htype_other;
1545 header_last->next = next;
1548 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1549 "%s (more than %d characters): message abandoned",
1550 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1554 smtp_reply = US"552 Message header is ridiculously long";
1555 receive_swallow_smtp();
1556 goto TIDYUP; /* Skip to end of function */
1561 give_local_error(ERRMESS_VLONGHEADER,
1562 string_sprintf("message header longer than %d characters received: "
1563 "message not accepted", header_maxsize), US"", error_rc, stdin,
1565 /* Does not return */
1569 continue; /* With next input character */
1571 /* End of header line reached */
1575 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1577 receive_linecount++;
1578 message_linecount++;
1580 /* Now put in the terminating newline. There is always space for
1581 at least two more characters. */
1583 next->text[ptr++] = '\n';
1586 /* A blank line signals the end of the headers; release the unwanted
1587 space and set next to NULL to indicate this. */
1596 /* There is data in the line; see if the next input character is a
1597 whitespace character. If it is, we have a continuation of this header line.
1598 There is always space for at least one character at this point. */
1602 int nextch = (RECEIVE_GETC)();
1603 if (nextch == ' ' || nextch == '\t')
1605 next->text[ptr++] = nextch;
1607 continue; /* Iterate the loop */
1609 else if (nextch != EOF) (RECEIVE_UNGETC)(nextch); /* For next time */
1610 else ch = EOF; /* Cause main loop to exit at end */
1613 /* We have got to the real line end. Terminate the string and release store
1614 beyond it. If it turns out to be a real header, internal binary zeros will
1615 be squashed later. */
1617 next->text[ptr] = 0;
1619 store_reset(next->text + ptr + 1);
1621 /* Check the running total size against the overall message size limit. We
1622 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1623 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1624 headers - the code to read the body will then also hit the buffer. */
1626 if (message_size > thismessage_size_limit) break;
1628 /* A line that is not syntactically correct for a header also marks
1629 the end of the headers. In this case, we leave next containing the
1630 first data line. This might actually be several lines because of the
1631 continuation logic applied above, but that doesn't matter.
1633 It turns out that smail, and presumably sendmail, accept leading lines
1636 From ph10 Fri Jan 5 12:35 GMT 1996
1638 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1639 find any documentation of this, but for compatibility it had better be
1640 accepted. Exim restricts it to the case of non-smtp messages, and
1641 treats it as an alternative to the -f command line option. Thus it is
1642 ignored except for trusted users or filter testing. Otherwise it is taken
1643 as the sender address, unless -f was used (sendmail compatibility).
1645 It further turns out that some UUCPs generate the From_line in a different
1648 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1650 The regex for matching these things is now capable of recognizing both
1651 formats (including 2- and 4-digit years in the latter). In fact, the regex
1652 is now configurable, as is the expansion string to fish out the sender.
1654 Even further on it has been discovered that some broken clients send
1655 these lines in SMTP messages. There is now an option to ignore them from
1656 specified hosts or networks. Sigh. */
1658 if (header_last == header_list &&
1661 (sender_host_address != NULL &&
1662 verify_check_host(&ignore_fromline_hosts) == OK)
1664 (sender_host_address == NULL && ignore_fromline_local)
1666 regex_match_and_setup(regex_From, next->text, 0, -1))
1668 if (!sender_address_forced)
1670 uschar *uucp_sender = expand_string(uucp_from_sender);
1671 if (uucp_sender == NULL)
1673 log_write(0, LOG_MAIN|LOG_PANIC,
1674 "expansion of \"%s\" failed after matching "
1675 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1679 int start, end, domain;
1681 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1682 &start, &end, &domain, TRUE);
1683 if (newsender != NULL)
1685 if (domain == 0 && newsender[0] != 0)
1686 newsender = rewrite_address_qualify(newsender, FALSE);
1688 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1690 sender_address = newsender;
1692 if (trusted_caller || filter_test != FTEST_NONE)
1694 authenticated_sender = NULL;
1695 originator_name = US"";
1696 sender_local = FALSE;
1699 if (filter_test != FTEST_NONE)
1700 printf("Sender taken from \"From \" line\n");
1707 /* Not a leading "From " line. Check to see if it is a valid header line.
1708 Header names may contain any non-control characters except space and colon,
1713 uschar *p = next->text;
1715 /* If not a valid header line, break from the header reading loop, leaving
1716 next != NULL, indicating that it holds the first line of the body. */
1718 if (isspace(*p)) break;
1719 while (mac_isgraph(*p) && *p != ':') p++;
1720 while (isspace(*p)) p++;
1723 body_zerocount = had_zero;
1727 /* We have a valid header line. If there were any binary zeroes in
1728 the line, stomp on them here. */
1731 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1733 /* It is perfectly legal to have an empty continuation line
1734 at the end of a header, but it is confusing to humans
1735 looking at such messages, since it looks like a blank line.
1736 Reduce confusion by removing redundant white space at the
1737 end. We know that there is at least one printing character
1738 (the ':' tested for above) so there is no danger of running
1741 p = next->text + ptr - 2;
1744 while (*p == ' ' || *p == '\t') p--;
1745 if (*p != '\n') break;
1746 ptr = (p--) - next->text + 1;
1747 message_size -= next->slen - ptr;
1748 next->text[ptr] = 0;
1752 /* Add the header to the chain */
1754 next->type = htype_other;
1756 header_last->next = next;
1759 /* Check the limit for individual line lengths. This comes after adding to
1760 the chain so that the failing line is reflected if a bounce is generated
1761 (for a local message). */
1763 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1765 log_write(0, LOG_MAIN, "overlong message header line received from "
1766 "%s (more than %d characters): message abandoned",
1767 sender_host_unknown? sender_ident : sender_fullhost,
1768 header_line_maxsize);
1772 smtp_reply = US"552 A message header line is too long";
1773 receive_swallow_smtp();
1774 goto TIDYUP; /* Skip to end of function */
1779 give_local_error(ERRMESS_VLONGHDRLINE,
1780 string_sprintf("message header line longer than %d characters "
1781 "received: message not accepted", header_line_maxsize), US"",
1782 error_rc, stdin, header_list->next);
1783 /* Does not return */
1787 /* Note if any resent- fields exist. */
1789 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1791 resents_exist = TRUE;
1792 resent_prefix = US"Resent-";
1796 /* The line has been handled. If we have hit EOF, break out of the loop,
1797 indicating no pending data line. */
1799 if (ch == EOF) { next = NULL; break; }
1801 /* Set up for the next header */
1804 next = store_get(sizeof(header_line));
1805 next->text = store_get(header_size);
1808 } /* Continue, starting to read the next header */
1810 /* At this point, we have read all the headers into a data structure in main
1811 store. The first header is still the dummy placeholder for the Received: header
1812 we are going to generate a bit later on. If next != NULL, it contains the first
1813 data line - which terminated the headers before reaching a blank line (not the
1818 debug_printf(">>Headers received:\n");
1819 for (h = header_list->next; h != NULL; h = h->next)
1820 debug_printf("%s", h->text);
1824 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1825 is dropped immediately after valid headers, the next thing we will see is EOF.
1826 We must test for this specially, as further down the reading of the data is
1827 skipped if already at EOF. */
1829 if (smtp_input && (receive_feof)())
1831 smtp_reply = handle_lost_connection(US" (after header)");
1833 goto TIDYUP; /* Skip to end of function */
1836 /* If this is a filter test run and no headers were read, output a warning
1837 in case there is a mistake in the test message. */
1839 if (filter_test != FTEST_NONE && header_list->next == NULL)
1840 printf("Warning: no message headers read\n");
1843 /* Scan the headers to identify them. Some are merely marked for later
1844 processing; some are dealt with here. */
1846 for (h = header_list->next; h != NULL; h = h->next)
1848 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1849 if (is_resent) contains_resent_headers = TRUE;
1851 switch (header_checkname(h, is_resent))
1853 /* "Bcc:" gets flagged, and its existence noted, whether it's resent- or
1857 h->type = htype_bcc;
1859 bcc_header_exists = TRUE;
1863 /* "Cc:" gets flagged, and the existence of a recipient header is noted,
1864 whether it's resent- or not. */
1869 to_or_cc_header_exists = TRUE;
1873 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1876 date_header_exists = !resents_exist || is_resent;
1879 /* Same comments as about Return-Path: below. */
1881 case htype_delivery_date:
1882 if (delivery_date_remove) h->type = htype_old;
1885 /* Same comments as about Return-Path: below. */
1887 case htype_envelope_to:
1888 if (envelope_to_remove) h->type = htype_old;
1891 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1892 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1893 header consists of just the login id of the user who called Exim, rewrite
1894 it with the gecos field first. Apply this rule to Resent-From: if there
1895 are resent- fields. */
1898 h->type = htype_from;
1899 if (!resents_exist || is_resent)
1904 uschar *s = Ustrchr(h->text, ':') + 1;
1905 while (isspace(*s)) s++;
1906 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1908 uschar *name = is_resent? US"Resent-From" : US"From";
1909 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1910 originator_login, qualify_domain_sender);
1911 from_header = header_last;
1912 h->type = htype_old;
1913 DEBUG(D_receive|D_rewrite)
1914 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1920 /* Identify the Message-id: header for generating "in-reply-to" in the
1921 autoreply transport. For incoming logging, save any resent- value. In both
1922 cases, take just the first of any multiples. */
1925 if (msgid_header == NULL && (!resents_exist || is_resent))
1932 /* Flag all Received: headers */
1934 case htype_received:
1935 h->type = htype_received;
1939 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1941 case htype_reply_to:
1942 h->type = htype_reply_to;
1945 /* The Return-path: header is supposed to be added to messages when
1946 they leave the SMTP system. We shouldn't receive messages that already
1947 contain Return-path. However, since Exim generates Return-path: on
1948 local delivery, resent messages may well contain it. We therefore
1949 provide an option (which defaults on) to remove any Return-path: headers
1950 on input. Removal actually means flagging as "old", which prevents the
1951 header being transmitted with the message. */
1953 case htype_return_path:
1954 if (return_path_remove) h->type = htype_old;
1956 /* If we are testing a mail filter file, use the value of the
1957 Return-Path: header to set up the return_path variable, which is not
1958 otherwise set. However, remove any <> that surround the address
1959 because the variable doesn't have these. */
1961 if (filter_test != FTEST_NONE)
1963 uschar *start = h->text + 12;
1964 uschar *end = start + Ustrlen(start);
1965 while (isspace(*start)) start++;
1966 while (end > start && isspace(end[-1])) end--;
1967 if (*start == '<' && end[-1] == '>')
1972 return_path = string_copyn(start, end - start);
1973 printf("Return-path taken from \"Return-path:\" header line\n");
1977 /* If there is a "Sender:" header and the message is locally originated,
1978 and from an untrusted caller, or if we are in submission mode for a remote
1979 message, mark it "old" so that it will not be transmitted with the message,
1980 unless active_local_sender_retain is set. (This can only be true if
1981 active_local_from_check is false.) If there are any resent- headers in the
1982 message, apply this rule to Resent-Sender: instead of Sender:. Messages
1983 with multiple resent- header sets cannot be tidily handled. (For this
1984 reason, at least one MUA - Pine - turns old resent- headers into X-resent-
1985 headers when resending, leaving just one set.) */
1988 h->type = ((!active_local_sender_retain &&
1989 ((sender_local && !trusted_caller) || submission_mode)
1991 (!resents_exist||is_resent))?
1992 htype_old : htype_sender;
1995 /* Remember the Subject: header for logging. There is no Resent-Subject */
2001 /* "To:" gets flagged, and the existence of a recipient header is noted,
2002 whether it's resent- or not. */
2007 to_or_cc_header_exists = TRUE;
2013 /* Extract recipients from the headers if that is required (the -t option).
2014 Note that this is documented as being done *before* any address rewriting takes
2015 place. There are two possibilities:
2017 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2018 recipients already listed are to be REMOVED from the message. Smail 3 works
2019 like this. We need to build a non-recipients tree for that list, because in
2020 subsequent processing this data is held in a tree and that's what the
2021 spool_write_header() function expects. Make sure that non-recipient addresses
2022 are fully qualified and rewritten if necessary.
2024 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2025 those in the command line arguments (and it is rumoured some other MTAs do
2026 this). Therefore, there is an option to make Exim behave this way.
2028 *** Notes on "Resent-" header lines ***
2030 The presence of resent-headers in the message makes -t horribly ambiguous.
2031 Experiments with sendmail showed that it uses recipients for all resent-
2032 headers, totally ignoring the concept of "sets of resent- headers" as described
2033 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2034 with all the addresses in one instance of each header.
2036 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2037 error for -t if there were resent- headers in the message. However, after a
2038 discussion on the mailing list, I've learned that there are MUAs that use
2039 resent- headers with -t, and also that the stuff about sets of resent- headers
2040 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2041 message with -t and resent- header lines makes sure that only *its* resent-
2042 headers are present; previous ones are often renamed as X-resent- for example.
2044 Consequently, Exim has been changed so that, if any resent- header lines are
2045 present, the recipients are taken from all of the appropriate resent- lines,
2046 and not from the ordinary To:, Cc:, etc. */
2051 error_block **bnext = &bad_addresses;
2053 if (extract_addresses_remove_arguments)
2055 while (recipients_count-- > 0)
2057 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2058 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2059 tree_add_nonrecipient(s);
2061 recipients_list = NULL;
2062 recipients_count = recipients_list_max = 0;
2065 parse_allow_group = TRUE; /* Allow address group syntax */
2067 /* Now scan the headers */
2069 for (h = header_list->next; h != NULL; h = h->next)
2071 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2072 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2074 uschar *s = Ustrchr(h->text, ':') + 1;
2075 while (isspace(*s)) s++;
2079 uschar *ss = parse_find_address_end(s, FALSE);
2080 uschar *recipient, *errmess, *p, *pp;
2081 int start, end, domain;
2083 /* Check on maximum */
2085 if (recipients_max > 0 && ++rcount > recipients_max)
2087 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2088 US"message rejected: ", error_rc, stdin, NULL);
2089 /* Does not return */
2092 /* Make a copy of the address, and remove any internal newlines. These
2093 may be present as a result of continuations of the header line. The
2094 white space that follows the newline must not be removed - it is part
2097 pp = recipient = store_get(ss - s + 1);
2098 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2100 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2103 /* Keep a list of all the bad addresses so we can send a single
2104 error message at the end. However, an empty address is not an error;
2105 just ignore it. This can come from an empty group list like
2107 To: Recipients of list:;
2109 If there are no recipients at all, an error will occur later. */
2111 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2113 int len = Ustrlen(s);
2114 error_block *b = store_get(sizeof(error_block));
2115 while (len > 0 && isspace(s[len-1])) len--;
2117 b->text1 = string_printing(string_copyn(s, len));
2123 /* If the recipient is already in the nonrecipients tree, it must
2124 have appeared on the command line with the option extract_addresses_
2125 remove_arguments set. Do not add it to the recipients, and keep a note
2126 that this has happened, in order to give a better error if there are
2127 no recipients left. */
2129 else if (recipient != NULL)
2131 if (tree_search(tree_nonrecipients, recipient) == NULL)
2132 receive_add_recipient(recipient, -1);
2134 extracted_ignored = TRUE;
2137 /* Move on past this address */
2139 s = ss + (*ss? 1:0);
2140 while (isspace(*s)) s++;
2143 /* If this was the bcc: header, mark it "old", which means it
2144 will be kept on the spool, but not transmitted as part of the
2147 if (h->type == htype_bcc)
2149 h->type = htype_old;
2151 bcc_header_exists = FALSE;
2154 } /* For appropriate header line */
2155 } /* For each header line */
2157 parse_allow_group = FALSE; /* Reset group syntax flags */
2158 parse_found_group = FALSE;
2161 /* Now build the unique message id. This has changed several times over the
2162 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2163 Retaining all the history in the comment has become too unwieldy - read
2164 previous release sources if you want it.
2166 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2167 The first part is the current time, in seconds. The second part is the current
2168 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2169 can hold a number in the range 0-3843. It used to be a computed sequence
2170 number, but is now the fractional component of the current time in units of
2171 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2172 received, Exim ensures that the timer has ticked at the appropriate level
2173 before proceeding, to avoid duplication if the pid happened to be re-used
2174 within the same time period. It seems likely that most messages will take at
2175 least half a millisecond to be received, so no delay will normally be
2176 necessary. At least for some time...
2178 There is a modification when localhost_number is set. Formerly this was allowed
2179 to be as large as 255. Now it is restricted to the range 0-16, and the final
2180 component of the message id becomes (localhost_number * 200) + fractional time
2181 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2183 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2184 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2185 still allows the tttttt field to hold a large enough number to last for some
2186 more decades, and the final two-digit field can hold numbers up to 1295, which
2187 is enough for milliseconds (instead of 1/2000 of a second).
2189 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2190 pid, so it is probably safe because pids have to be positive. The
2191 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2192 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2194 Note that string_base62() returns its data in a static storage block, so it
2195 must be copied before calling string_base62() again. It always returns exactly
2198 There doesn't seem to be anything in the RFC which requires a message id to
2199 start with a letter, but Smail was changed to ensure this. The external form of
2200 the message id (as supplied by string expansion) therefore starts with an
2201 additional leading 'E'. The spool file names do not include this leading
2202 letter and it is not used internally.
2204 NOTE: If ever the format of message ids is changed, the regular expression for
2205 checking that a string is in this format must be updated in a corresponding
2206 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2207 must also be changed to reflect the correct string length. Then, of course,
2208 other programs that rely on the message id format will need updating too. */
2210 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2211 message_id[6] = '-';
2212 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2214 /* Deal with the case where the host number is set. The value of the number was
2215 checked when it was read, to ensure it isn't too big. The timing granularity is
2216 left in id_resolution so that an appropriate wait can be done after receiving
2217 the message, if necessary (we hope it won't be). */
2219 if (host_number_string != NULL)
2221 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2222 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2223 string_base62((long int)(
2224 host_number * (1000000/id_resolution) +
2225 message_id_tv.tv_usec/id_resolution)) + 4);
2228 /* Host number not set: final field is just the fractional time at an
2229 appropriate resolution. */
2233 id_resolution = (BASE_62 == 62)? 500 : 1000;
2234 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2235 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2238 /* Add the current message id onto the current process info string if
2241 (void)string_format(process_info + process_info_len,
2242 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2244 /* If we are using multiple input directories, set up the one for this message
2245 to be the least significant base-62 digit of the time of arrival. Otherwise
2246 ensure that it is an empty string. */
2248 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2250 /* Now that we have the message-id, if there is no message-id: header, generate
2251 one, but only for local or submission mode messages. This can be
2252 user-configured if required, but we had better flatten any illegal characters
2255 if (msgid_header == NULL && (sender_host_address == NULL || submission_mode))
2258 uschar *id_text = US"";
2259 uschar *id_domain = primary_hostname;
2261 /* Permit only letters, digits, dots, and hyphens in the domain */
2263 if (message_id_domain != NULL)
2265 uschar *new_id_domain = expand_string(message_id_domain);
2266 if (new_id_domain == NULL)
2268 if (!expand_string_forcedfail)
2269 log_write(0, LOG_MAIN|LOG_PANIC,
2270 "expansion of \"%s\" (message_id_header_domain) "
2271 "failed: %s", message_id_domain, expand_string_message);
2273 else if (*new_id_domain != 0)
2275 id_domain = new_id_domain;
2276 for (p = id_domain; *p != 0; p++)
2277 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2281 /* Permit all characters except controls and RFC 2822 specials in the
2282 additional text part. */
2284 if (message_id_text != NULL)
2286 uschar *new_id_text = expand_string(message_id_text);
2287 if (new_id_text == NULL)
2289 if (!expand_string_forcedfail)
2290 log_write(0, LOG_MAIN|LOG_PANIC,
2291 "expansion of \"%s\" (message_id_header_text) "
2292 "failed: %s", message_id_text, expand_string_message);
2294 else if (*new_id_text != 0)
2296 id_text = new_id_text;
2297 for (p = id_text; *p != 0; p++)
2298 if (mac_iscntrl_or_special(*p)) *p = '-';
2302 /* Add the header line */
2304 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2305 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2308 /* If we are to log recipients, keep a copy of the raw ones before any possible
2309 rewriting. Must copy the count, because later ACLs and the local_scan()
2310 function may mess with the real recipients. */
2312 if ((log_extra_selector & LX_received_recipients) != 0)
2314 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2315 for (i = 0; i < recipients_count; i++)
2316 raw_recipients[i] = string_copy(recipients_list[i].address);
2317 raw_recipients_count = recipients_count;
2320 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2321 recipients will get here only if the conditions were right (allow_unqualified_
2322 recipient is TRUE). */
2324 for (i = 0; i < recipients_count; i++)
2325 recipients_list[i].address =
2326 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2327 global_rewrite_rules, rewrite_existflags);
2329 /* If there is no From: header, generate one for local or submission_mode
2330 messages. If there is no sender address, but the sender is local or this is a
2331 local delivery error, use the originator login. This shouldn't happen for
2332 genuine bounces, but might happen for autoreplies. The addition of From: must
2333 be done *before* checking for the possible addition of a Sender: header,
2334 because untrusted_set_sender allows an untrusted user to set anything in the
2335 envelope (which might then get info From:) but we still want to ensure a valid
2336 Sender: if it is required. */
2338 if (from_header == NULL && (sender_host_address == NULL || submission_mode))
2340 /* Envelope sender is empty */
2342 if (sender_address[0] == 0)
2344 if (sender_local || local_error_message)
2346 header_add(htype_from, "%sFrom: %s%s%s@%s%s\n", resent_prefix,
2348 (originator_name[0] == 0)? "" : " <",
2349 local_part_quote(originator_login),
2350 qualify_domain_sender,
2351 (originator_name[0] == 0)? "" : ">");
2353 else if (submission_mode && authenticated_id != NULL)
2355 if (submission_domain == NULL)
2357 header_add(htype_from, "%sFrom: %s@%s\n", resent_prefix,
2358 local_part_quote(authenticated_id), qualify_domain_sender);
2360 else if (submission_domain[0] == 0) /* empty => whole address set */
2362 header_add(htype_from, "%sFrom: %s\n", resent_prefix,
2367 header_add(htype_from, "%sFrom: %s@%s\n", resent_prefix,
2368 local_part_quote(authenticated_id), submission_domain);
2370 from_header = header_last; /* To get it checked for Sender: */
2374 /* There is a non-null envelope sender. Build the header using the original
2375 sender address, before any rewriting that might have been done while
2380 if (!smtp_input || sender_local)
2381 header_add(htype_from, "%sFrom: %s%s%s%s\n",
2382 resent_prefix, originator_name,
2383 (originator_name[0] == 0)? "" : " <",
2384 (sender_address_unrewritten == NULL)?
2385 sender_address : sender_address_unrewritten,
2386 (originator_name[0] == 0)? "" : ">");
2388 header_add(htype_from, "%sFrom: %s\n", resent_prefix, sender_address);
2390 from_header = header_last; /* To get it checked for Sender: */
2395 /* If the sender is local, or if we are in submission mode and there is an
2396 authenticated_id, check that an existing From: is correct, and if not, generate
2397 a Sender: header, unless disabled. Any previously-existing Sender: header was
2398 removed above. Note that sender_local, as well as being TRUE if the caller of
2399 exim is not trusted, is also true if a trusted caller did not supply a -f
2400 argument for non-smtp input. To allow trusted callers to forge From: without
2401 supplying -f, we have to test explicitly here. If the From: header contains
2402 more than one address, then the call to parse_extract_address fails, and a
2403 Sender: header is inserted, as required. */
2405 if (from_header != NULL &&
2406 (active_local_from_check &&
2407 ((sender_local && !trusted_caller) ||
2408 (submission_mode && authenticated_id != NULL))
2411 BOOL make_sender = TRUE;
2412 int start, end, domain;
2414 uschar *from_address =
2415 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2416 &start, &end, &domain, FALSE);
2417 uschar *generated_sender_address;
2419 if (submission_mode)
2421 if (submission_domain == NULL)
2423 generated_sender_address = string_sprintf("%s@%s",
2424 local_part_quote(authenticated_id), qualify_domain_sender);
2426 else if (submission_domain[0] == 0) /* empty => full address */
2428 generated_sender_address = string_sprintf("%s",
2433 generated_sender_address = string_sprintf("%s@%s",
2434 local_part_quote(authenticated_id), submission_domain);
2438 generated_sender_address = string_sprintf("%s@%s",
2439 local_part_quote(originator_login), qualify_domain_sender);
2441 /* Remove permitted prefixes and suffixes from the local part of the From:
2442 address before doing the comparison with the generated sender. */
2444 if (from_address != NULL)
2447 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2449 if (at != NULL) *at = 0;
2450 from_address += route_check_prefix(from_address, local_from_prefix);
2451 slen = route_check_suffix(from_address, local_from_suffix);
2454 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2455 from_address += slen;
2457 if (at != NULL) *at = '@';
2459 if (strcmpic(generated_sender_address, from_address) == 0 ||
2460 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2461 make_sender = FALSE;
2464 /* We have to cause the Sender header to be rewritten if there are
2465 appropriate rewriting rules. */
2469 if (submission_mode)
2470 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2471 generated_sender_address);
2473 header_add(htype_sender, "%sSender: %s <%s>\n",
2474 resent_prefix, originator_name, generated_sender_address);
2479 /* If there are any rewriting rules, apply them to the sender address, unless
2480 it has already been rewritten as part of verification for SMTP input. */
2482 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2483 sender_address[0] != 0)
2485 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2486 global_rewrite_rules, rewrite_existflags);
2487 DEBUG(D_receive|D_rewrite)
2488 debug_printf("rewritten sender = %s\n", sender_address);
2492 /* The headers must be run through rewrite_header(), because it ensures that
2493 addresses are fully qualified, as well as applying any rewriting rules that may
2496 Qualification of header addresses in a message from a remote host happens only
2497 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2498 appropriate. For local messages, qualification always happens, unless -bnq is
2499 used to explicitly suppress it. No rewriting is done for an unqualified address
2500 that is left untouched.
2502 We start at the second header, skipping our own Received:. This rewriting is
2503 documented as happening *after* recipient addresses are taken from the headers
2504 by the -t command line option. An added Sender: gets rewritten here. */
2506 for (h = header_list->next; h != NULL; h = h->next)
2508 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2509 rewrite_existflags, TRUE);
2510 if (newh != NULL) h = newh;
2514 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2515 "cc", or "bcc". Note that although the minimal examples in RFC822 show just
2516 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2517 exists, this applies to the set of resent- headers rather than the normal set.
2519 The requirement for a recipient header has been removed in RFC 2822. Earlier
2520 versions of Exim added a To: header for locally submitted messages, and an
2521 empty Bcc: header for others or when always_bcc was set. In the light of the
2522 changes in RFC 2822, we now always add Bcc: just in case there are still MTAs
2523 out there that insist on the RFC 822 syntax.
2525 November 2003: While generally revising what Exim does to fix up headers, it
2526 seems like a good time to remove this altogether. */
2529 if (!to_or_cc_header_exists && !bcc_header_exists)
2530 header_add(htype_bcc, "Bcc:\n");
2533 /* If there is no date header, generate one if the message originates locally
2534 (i.e. not over TCP/IP) or the submission mode flag is set. Messages without
2535 Date: are not valid, but it seems to be more confusing if Exim adds one to
2536 all remotely-originated messages. */
2538 if (!date_header_exists && (sender_host_address == NULL || submission_mode))
2539 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2541 search_tidyup(); /* Free any cached resources */
2543 /* Show the complete set of headers if debugging. Note that the first one (the
2544 new Received:) has not yet been set. */
2548 debug_printf(">>Headers after rewriting and local additions:\n");
2549 for (h = header_list->next; h != NULL; h = h->next)
2550 debug_printf("%c %s", h->type, h->text);
2554 /* The headers are now complete in store. If we are running in filter
2555 testing mode, that is all this function does. Return TRUE if the message
2556 ended with a dot. */
2558 if (filter_test != FTEST_NONE)
2560 process_info[process_info_len] = 0;
2561 return message_ended == END_DOT;
2564 /* Open a new spool file for the data portion of the message. We need
2565 to access it both via a file descriptor and a stream. Try to make the
2566 directory if it isn't there. Note re use of sprintf: spool_directory
2567 is checked on input to be < 200 characters long. */
2569 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2571 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2574 if (errno == ENOENT)
2577 sprintf(CS temp, "input/%s", message_subdir);
2578 if (message_subdir[0] == 0) temp[5] = 0;
2579 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2580 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2583 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2584 spool_name, strerror(errno));
2587 /* Make sure the file's group is the Exim gid, and double-check the mode
2588 because the group setting doesn't always get set automatically. */
2590 fchown(data_fd, exim_uid, exim_gid);
2591 fchmod(data_fd, SPOOL_MODE);
2593 /* We now have data file open. Build a stream for it and lock it. We lock only
2594 the first line of the file (containing the message ID) because otherwise there
2595 are problems when Exim is run under Cygwin (I'm told). See comments in
2596 spool_in.c, where the same locking is done. */
2598 data_file = fdopen(data_fd, "w+");
2599 lock_data.l_type = F_WRLCK;
2600 lock_data.l_whence = SEEK_SET;
2601 lock_data.l_start = 0;
2602 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2604 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2605 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2606 errno, strerror(errno));
2608 /* We have an open, locked data file. Write the message id to it to make it
2609 self-identifying. Then read the remainder of the input of this message and
2610 write it to the data file. If the variable next != NULL, it contains the first
2611 data line (which was read as a header but then turned out not to have the right
2612 format); write it (remembering that it might contain binary zeros). The result
2613 of fwrite() isn't inspected; instead we call ferror() below. */
2615 fprintf(data_file, "%s-D\n", message_id);
2618 uschar *s = next->text;
2619 int len = next->slen;
2620 fwrite(s, 1, len, data_file);
2621 body_linecount++; /* Assumes only 1 line */
2624 /* Note that we might already be at end of file, or the logical end of file
2625 (indicated by '.'), or might have encountered an error while writing the
2626 message id or "next" line. */
2628 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2632 message_ended = read_message_data_smtp(data_file);
2633 receive_linecount++; /* The terminating "." line */
2635 else message_ended = read_message_data(data_file);
2637 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2638 message_linecount += body_linecount;
2640 /* Handle premature termination of SMTP */
2642 if (smtp_input && message_ended == END_EOF)
2644 Uunlink(spool_name); /* Lose data file when closed */
2645 message_id[0] = 0; /* Indicate no message accepted */
2646 smtp_reply = handle_lost_connection(US"");
2648 goto TIDYUP; /* Skip to end of function */
2651 /* Handle message that is too big. Don't use host_or_ident() in the log
2652 message; we want to see the ident value even for non-remote messages. */
2654 if (message_ended == END_SIZE)
2656 Uunlink(spool_name); /* Lose the data file when closed */
2657 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2659 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2660 "message too big: read=%d max=%d",
2662 (sender_fullhost == NULL)? "" : " H=",
2663 (sender_fullhost == NULL)? US"" : sender_fullhost,
2664 (sender_ident == NULL)? "" : " U=",
2665 (sender_ident == NULL)? US"" : sender_ident,
2667 thismessage_size_limit);
2671 smtp_reply = US"552 Message size exceeds maximum permitted";
2672 message_id[0] = 0; /* Indicate no message accepted */
2673 goto TIDYUP; /* Skip to end of function */
2677 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2678 give_local_error(ERRMESS_TOOBIG,
2679 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2680 US"message rejected: ", error_rc, data_file, header_list);
2681 /* Does not return */
2686 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2687 example, there may be some expansion in an ACL that uses a timer.) */
2689 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2691 /* The message body has now been read into the data file. Call fflush() to
2692 empty the buffers in C, and then call fsync() to get the data written out onto
2693 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2694 having to do this). If there was an I/O error on either input or output,
2695 attempt to send an error message, and unlink the spool file. For non-SMTP input
2696 we can then give up. Note that for SMTP input we must swallow the remainder of
2697 the input in cases of output errors, since the far end doesn't expect to see
2698 anything until the terminating dot line is sent. */
2700 if (fflush(data_file) == EOF || ferror(data_file) ||
2701 fsync(fileno(data_file)) < 0 || (receive_ferror)())
2703 uschar *msg_errno = US strerror(errno);
2704 BOOL input_error = (receive_ferror)() != 0;
2705 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2706 input_error? "Input read" : "Spool write",
2708 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2710 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2711 Uunlink(spool_name); /* Lose the data file */
2716 smtp_reply = US"451 Error while reading input data";
2719 smtp_reply = US"451 Error while writing spool file";
2720 receive_swallow_smtp();
2722 message_id[0] = 0; /* Indicate no message accepted */
2723 goto TIDYUP; /* Skip to end of function */
2728 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2729 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2731 /* Does not return */
2736 /* No I/O errors were encountered while writing the data file. */
2738 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2741 /* If there were any bad addresses extracted by -t, or there were no recipients
2742 left after -t, send a message to the sender of this message, or write it to
2743 stderr if the error handling option is set that way. Note that there may
2744 legitimately be no recipients for an SMTP message if they have all been removed
2747 We need to rewind the data file in order to read it. In the case of no
2748 recipients or stderr error writing, throw the data file away afterwards, and
2749 exit. (This can't be SMTP, which always ensures there's at least one
2750 syntactically good recipient address.) */
2752 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2756 if (recipients_count == 0) debug_printf("*** No recipients\n");
2757 if (bad_addresses != NULL)
2759 error_block *eblock = bad_addresses;
2760 debug_printf("*** Bad address(es)\n");
2761 while (eblock != NULL)
2763 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2764 eblock = eblock->next;
2769 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2771 /* If configured to send errors to the sender, but this fails, force
2772 a failure error code. We use a special one for no recipients so that it
2773 can be detected by the autoreply transport. Otherwise error_rc is set to
2774 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2775 it is EXIT_SUCCESS. */
2777 if (error_handling == ERRORS_SENDER)
2779 if (!moan_to_sender(
2780 (bad_addresses == NULL)?
2781 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2782 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2783 bad_addresses, header_list, data_file, FALSE))
2784 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2788 if (bad_addresses == NULL)
2790 if (extracted_ignored)
2791 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2793 fprintf(stderr, "exim: no recipients in message\n");
2797 fprintf(stderr, "exim: invalid address%s",
2798 (bad_addresses->next == NULL)? ":" : "es:\n");
2799 while (bad_addresses != NULL)
2801 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2802 bad_addresses->text2);
2803 bad_addresses = bad_addresses->next;
2808 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2810 Uunlink(spool_name);
2812 exim_exit(error_rc);
2816 /* Data file successfully written. Generate text for the Received: header by
2817 expanding the configured string, and adding a timestamp. By leaving this
2818 operation till now, we ensure that the timestamp is the time that message
2819 reception was completed. However, this is deliberately done before calling the
2820 data ACL and local_scan().
2822 This Received: header may therefore be inspected by the data ACL and by code in
2823 the local_scan() function. When they have run, we update the timestamp to be
2824 the final time of reception.
2826 If there is just one recipient, set up its value in the $received_for variable
2827 for use when we generate the Received: header.
2829 Note: the checking for too many Received: headers is handled by the delivery
2832 timestamp = expand_string(US"${tod_full}");
2833 if (recipients_count == 1) received_for = recipients_list[0].address;
2834 received = expand_string(received_header_text);
2835 received_for = NULL;
2837 if (received == NULL)
2839 Uunlink(spool_name); /* Lose the data file */
2840 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2841 "(received_header_text) failed: %s", string_printing(received_header_text),
2842 expand_string_message);
2845 /* The first element on the header chain is reserved for the Received header,
2846 so all we have to do is fill in the text pointer, and set the type. However, if
2847 the result of the expansion is an empty string, we leave the header marked as
2848 "old" so as to refrain from adding a Received header. */
2850 if (received[0] == 0)
2852 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2853 received_header->type = htype_old;
2857 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2858 received_header->type = htype_received;
2861 received_header->slen = Ustrlen(received_header->text);
2863 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2864 received_header->type, received_header->text);
2866 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2868 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2869 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2871 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2872 now, before running the DATA ACL. */
2874 add_acl_headers(US"MAIL or RCPT");
2876 /* If an ACL is specified for checking things at this stage of reception of a
2877 message, run it, unless all the recipients were removed by "discard" in earlier
2878 ACLs. That is the only case in which recipients_count can be zero at this
2879 stage. Set deliver_datafile to point to the data file so that $message_body and
2880 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2883 deliver_datafile = data_fd;
2885 if (recipients_count == 0)
2887 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2891 enable_dollar_recipients = TRUE;
2893 /* Handle interactive SMTP messages */
2895 if (smtp_input && !smtp_batched_input)
2898 #ifdef EXPERIMENTAL_DOMAINKEYS
2899 dk_exim_verify_finish();
2902 #ifdef WITH_CONTENT_SCAN
2903 if (acl_smtp_mime != NULL &&
2904 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
2906 #endif /* WITH_CONTENT_SCAN */
2908 /* Check the recipients count again, as the MIME ACL might have changed
2911 if (acl_smtp_data != NULL && recipients_count > 0)
2913 uschar *user_msg, *log_msg;
2914 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
2915 add_acl_headers(US"DATA");
2918 recipients_count = 0;
2919 blackholed_by = US"DATA ACL";
2920 if (log_msg != NULL)
2921 blackhole_log_msg = string_sprintf(": %s", log_msg);
2925 Uunlink(spool_name);
2926 #ifdef WITH_CONTENT_SCAN
2929 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
2930 smtp_yield = FALSE; /* No more messsages after dropped connection */
2931 smtp_reply = US""; /* Indicate reply already sent */
2932 message_id[0] = 0; /* Indicate no message accepted */
2933 goto TIDYUP; /* Skip to end of function */
2938 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
2939 we cannot take different actions for permanent and temporary rejections. */
2944 #ifdef WITH_CONTENT_SCAN
2945 if (acl_not_smtp_mime != NULL &&
2946 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
2949 #endif /* WITH_CONTENT_SCAN */
2951 if (acl_not_smtp != NULL)
2953 uschar *user_msg, *log_msg;
2954 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
2957 recipients_count = 0;
2958 blackholed_by = US"non-SMTP ACL";
2959 if (log_msg != NULL)
2960 blackhole_log_msg = string_sprintf(": %s", log_msg);
2964 Uunlink(spool_name);
2965 #ifdef WITH_CONTENT_SCAN
2968 log_write(0, LOG_MAIN|LOG_REJECT, "F=<%s> rejected by non-SMTP ACL: %s",
2969 sender_address, log_msg);
2970 if (user_msg == NULL) user_msg = US"local configuration problem";
2971 if (smtp_batched_input)
2973 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
2974 /* Does not return */
2978 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2979 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
2980 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
2982 /* Does not return */
2985 add_acl_headers(US"non-SMTP");
2989 /* The applicable ACLs have been run */
2991 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
2992 if (queue_only_policy) queued_by = US"ACL";
2994 enable_dollar_recipients = FALSE;
2997 #ifdef WITH_CONTENT_SCAN
3001 /* The final check on the message is to run the scan_local() function. The
3002 version supplied with Exim always accepts, but this is a hook for sysadmins to
3003 supply their own checking code. The local_scan() function is run even when all
3004 the recipients have been discarded. */
3006 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3008 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3009 deleted, and the incident gets logged. */
3011 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3012 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3013 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3014 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3016 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3017 local_scan_timeout);
3018 local_scan_data = NULL;
3020 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3021 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3022 rc = local_scan(data_fd, &local_scan_data);
3024 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3026 store_pool = POOL_MAIN; /* In case changed */
3027 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3030 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3031 os_non_restarting_signal(SIGFPE, SIG_DFL);
3032 os_non_restarting_signal(SIGILL, SIG_DFL);
3033 os_non_restarting_signal(SIGBUS, SIG_DFL);
3035 /* The length check is paranoia against some runaway code, and also because
3036 (for a success return) lines in the spool file are read into big_buffer. */
3038 if (local_scan_data != NULL)
3040 int len = Ustrlen(local_scan_data);
3041 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3042 local_scan_data = string_copyn(local_scan_data, len);
3045 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3047 if (!deliver_freeze) /* ACL might have already frozen */
3049 deliver_freeze = TRUE;
3050 deliver_frozen_at = time(NULL);
3051 frozen_by = US"local_scan()";
3053 rc = LOCAL_SCAN_ACCEPT;
3055 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3057 if (!queue_only_policy) /* ACL might have already queued */
3059 queue_only_policy = TRUE;
3060 queued_by = US"local_scan()";
3062 rc = LOCAL_SCAN_ACCEPT;
3065 /* Message accepted: remove newlines in local_scan_data because otherwise
3066 the spool file gets corrupted. Ensure that all recipients are qualified. */
3068 if (rc == LOCAL_SCAN_ACCEPT)
3070 if (local_scan_data != NULL)
3073 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3075 for (i = 0; i < recipients_count; i++)
3077 recipient_item *r = recipients_list + i;
3078 r->address = rewrite_address_qualify(r->address, TRUE);
3079 if (r->errors_to != NULL)
3080 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3082 if (recipients_count == 0 && blackholed_by == NULL)
3083 blackholed_by = US"local_scan";
3086 /* Message rejected: newlines permitted in local_scan_data to generate
3087 multiline SMTP responses. */
3091 uschar *istemp = US"";
3097 errmsg = local_scan_data;
3099 Uunlink(spool_name); /* Cancel this message */
3103 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3104 "rejection given", rc);
3107 case LOCAL_SCAN_REJECT_NOLOGHDR:
3108 log_extra_selector &= ~LX_rejected_header;
3111 case LOCAL_SCAN_REJECT:
3113 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3116 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3117 log_extra_selector &= ~LX_rejected_header;
3120 case LOCAL_SCAN_TEMPREJECT:
3123 if (errmsg == NULL) errmsg = US"Temporary local problem";
3124 istemp = US"temporarily ";
3128 s = string_append(s, &size, &sptr, 2, US"F=",
3129 (sender_address[0] == 0)? US"<>" : sender_address);
3130 s = add_host_info_for_log(s, &size, &sptr);
3133 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3134 s, istemp, string_printing(errmsg));
3138 if (!smtp_batched_input)
3140 smtp_respond(code, TRUE, errmsg);
3141 message_id[0] = 0; /* Indicate no message accepted */
3142 smtp_reply = US""; /* Indicate reply already sent */
3143 goto TIDYUP; /* Skip to end of function */
3147 moan_smtp_batch(NULL, "%d %s", code, errmsg);
3148 /* Does not return */
3153 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3154 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3155 US"message rejected by local scan code: ", error_rc, data_file,
3157 /* Does not return */
3161 /* Reset signal handlers to ignore signals that previously would have caused
3162 the message to be abandoned. */
3164 signal(SIGTERM, SIG_IGN);
3165 signal(SIGINT, SIG_IGN);
3167 /* Ensure the first time flag is set in the newly-received message. */
3169 deliver_firsttime = TRUE;
3171 #ifdef EXPERIMENTAL_BRIGHTMAIL
3173 /* rewind data file */
3174 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3175 bmi_verdicts = bmi_process_message(header_list, data_fd);
3179 /* Update the timstamp in our Received: header to account for any time taken by
3180 an ACL or by local_scan(). The new time is the time that all reception
3181 processing is complete. */
3183 timestamp = expand_string(US"${tod_full}");
3184 tslen = Ustrlen(timestamp);
3186 memcpy(received_header->text + received_header->slen - tslen - 1,
3189 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3193 deliver_freeze = FALSE;
3194 queue_only_policy = FALSE;
3197 /* Keep the data file open until we have written the header file, in order to
3198 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3199 don't write the header file, and we unlink the data file. If writing the header
3200 file fails, we have failed to accept this message. */
3202 if (host_checking || blackholed_by != NULL)
3205 Uunlink(spool_name);
3206 msg_size = 0; /* Compute size for log line */
3207 for (h = header_list; h != NULL; h = h->next)
3208 if (h->type != '*') msg_size += h->slen;
3211 /* Write the -H file */
3215 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3217 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3218 Uunlink(spool_name); /* Lose the data file */
3222 smtp_reply = US"451 Error in writing spool file";
3223 message_id[0] = 0; /* Indicate no message accepted */
3228 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3229 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3231 /* Does not return */
3237 /* The message has now been successfully received. */
3239 receive_messagecount++;
3241 /* In SMTP sessions we may receive several in one connection. After each one,
3242 we wait for the clock to tick at the level of message-id granularity. This is
3243 so that the combination of time+pid is unique, even on systems where the pid
3244 can be re-used within our time interval. We can't shorten the interval without
3245 re-designing the message-id. See comments above where the message id is
3246 created. This is Something For The Future. */
3248 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3249 exim_wait_tick(&message_id_tv, id_resolution);
3251 /* Add data size to written header size. We do not count the initial file name
3252 that is in the file, but we do add one extra for the notional blank line that
3253 precedes the data. This total differs from message_size in that it include the
3254 added Received: header and any other headers that got created locally. */
3257 fstat(data_fd, &statbuf);
3259 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3261 /* Generate a "message received" log entry. We do this by building up a dynamic
3262 string as required. Since we commonly want to add two items at a time, use a
3263 macro to simplify the coding. We log the arrival of a new message while the
3264 file is still locked, just in case the machine is *really* fast, and delivers
3265 it first! Include any message id that is in the message - since the syntax of a
3266 message id is actually an addr-spec, we can use the parse routine to canonicize
3271 s = store_get(size);
3273 s = string_append(s, &size, &sptr, 2, US"<= ",
3274 (sender_address[0] == 0)? US"<>" : sender_address);
3275 if (message_reference != NULL)
3276 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3278 s = add_host_info_for_log(s, &size, &sptr);
3281 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3282 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3283 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3285 s = string_append(s, &size, &sptr, 2, US" CV=",
3286 tls_certificate_verified? "yes":"no");
3287 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3288 s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\"");
3291 if (sender_host_authenticated != NULL)
3293 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3294 if (authenticated_id != NULL)
3295 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3298 sprintf(CS big_buffer, "%d", msg_size);
3299 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3301 /* If an addr-spec in a message-id contains a quoted string, it can contain
3302 any characters except " \ and CR and so in particular it can contain NL!
3303 Therefore, make sure we use a printing-characters only version for the log.
3304 Also, allow for domain literals in the message id. */
3306 if (msgid_header != NULL)
3309 BOOL save_allow_domain_literals = allow_domain_literals;
3310 allow_domain_literals = TRUE;
3311 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3312 &errmsg, &start, &end, &domain, FALSE);
3313 allow_domain_literals = save_allow_domain_literals;
3315 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3318 /* If subject logging is turned on, create suitable printing-character
3319 text. By expanding $h_subject: we make use of the MIME decoding. */
3321 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3324 uschar *p = big_buffer;
3325 uschar *ss = expand_string(US"$h_subject:");
3327 /* Backslash-quote any double quotes or backslashes so as to make a
3328 a C-like string, and turn any non-printers into escape sequences. */
3331 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3333 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3338 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3341 /* Terminate the string: string_cat() and string_append() leave room, but do
3342 not put the zero in. */
3346 /* While writing to the log, set a flag to cause a call to receive_bomb_out()
3347 if the log cannot be opened. */
3349 receive_call_bombout = TRUE;
3350 log_write(0, LOG_MAIN |
3351 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3352 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3354 receive_call_bombout = FALSE;
3356 /* Log any control actions taken by an ACL or local_scan(). */
3358 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3359 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3360 "no immediate delivery: queued by %s", queued_by);
3362 /* Create a message log file if message logs are being used and this message is
3363 not blackholed. Write the reception stuff to it. We used to leave message log
3364 creation until the first delivery, but this has proved confusing for somep
3367 if (message_logs && blackholed_by == NULL)
3371 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3373 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3375 if (fd < 0 && errno == ENOENT)
3378 sprintf(CS temp, "msglog/%s", message_subdir);
3379 if (message_subdir[0] == 0) temp[6] = 0;
3380 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3381 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3386 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3387 spool_name, strerror(errno));
3392 FILE *message_log = fdopen(fd, "a");
3393 if (message_log == NULL)
3395 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3396 spool_name, strerror(errno));
3401 uschar *now = tod_stamp(tod_log);
3402 fprintf(message_log, "%s Received from %s\n", now, s+3);
3403 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3405 if (queue_only_policy) fprintf(message_log,
3406 "%s no immediate delivery: queued by %s\n", now, queued_by);
3407 fclose(message_log);
3412 store_reset(s); /* The store for the main log message can be reused */
3414 /* If the message is frozen, and freeze_tell is set, do the telling. */
3416 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3418 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3419 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3420 message_id, frozen_by, sender_address);
3424 /* Either a message has been successfully received and written to the two spool
3425 files, or an error in writing the spool has occurred for an SMTP message, or
3426 an SMTP message has been rejected because of a bad sender. (For a non-SMTP
3427 message we will have already given up because there's no point in carrying on!)
3428 In either event, we must now close (and thereby unlock) the data file. In the
3429 successful case, this leaves the message on the spool, ready for delivery. In
3430 the error case, the spool file will be deleted. Then tidy up store, interact
3431 with an SMTP call if necessary, and return.
3433 A fflush() was done earlier in the expectation that any write errors on the
3434 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3435 possible for fclose() to fail - but what to do? What has happened to the lock
3439 process_info[process_info_len] = 0; /* Remove message id */
3440 if (data_file != NULL) fclose(data_file); /* Frees the lock */
3442 /* Now reset signal handlers to their defaults */
3444 signal(SIGTERM, SIG_DFL);
3445 signal(SIGINT, SIG_DFL);
3447 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3448 value, which defaults TRUE - meaning there may be more incoming messages from
3449 this connection. For non-SMTP callers (where there is only ever one message),
3450 the default is FALSE. */
3456 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3457 is set to the response. However, after an ACL error or local_scan() error,
3458 the response has already been sent, and smtp_reply is an empty string to
3461 if (!smtp_batched_input)
3463 if (smtp_reply == NULL)
3466 smtp_respond(550,TRUE,fake_reject_text);
3468 smtp_printf("250 OK id=%s\r\n", message_id);
3471 "\n**** SMTP testing: that is not a real message id!\n\n");
3473 else if (smtp_reply[0] != 0)
3475 if (fake_reject && (smtp_reply[0] == '2'))
3476 smtp_respond(550,TRUE,fake_reject_text);
3478 smtp_printf("%.1024s\r\n", smtp_reply);
3482 /* For batched SMTP, generate an error message on failure, and do
3483 nothing on success. The function moan_smtp_batch() does not return -
3484 it exits from the program with a non-zero return code. */
3486 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
3490 /* If blackholing, we can immediately log this message's sad fate. The data
3491 file has already been unlinked, and the header file was never written to disk.
3492 We must now indicate that nothing was received, to prevent a delivery from
3495 if (blackholed_by != NULL)
3497 uschar *detail = (local_scan_data != NULL)?
3498 string_printing(local_scan_data) :
3499 string_sprintf("(%s discarded recipients)", blackholed_by);
3500 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
3501 log_write(0, LOG_MAIN, "Completed");
3505 /* Reset headers so that logging of rejects for a subsequent message doesn't
3506 include them. It is also important to set header_last = NULL before exiting
3507 from this function, as this prevents certain rewrites that might happen during
3508 subsequent verifying (of another incoming message) from trying to add headers
3509 when they shouldn't. */
3511 header_list = header_last = NULL;
3513 return yield; /* TRUE if more messages (SMTP only) */
3516 /* End of receive.c */