1 /* $Cambridge: exim/src/src/receive.c,v 1.40 2007/08/22 10:10:23 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2007 */
8 /* See the file NOTICE for conditions of use and distribution. */
10 /* Code for receiving a message and setting up spool files. */
14 #ifdef EXPERIMENTAL_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 path; 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
287 reason text reason to pass to the not-quit ACL
288 msg default SMTP response to give if in an SMTP session
293 receive_bomb_out(uschar *reason, uschar *msg)
295 /* If spool_name is set, it contains the name of the data file that is being
296 written. Unlink it before closing so that it cannot be picked up by a delivery
297 process. Ensure that any header file is also removed. */
299 if (spool_name[0] != 0)
302 spool_name[Ustrlen(spool_name) - 1] = 'H';
306 /* Now close the file if it is open, either as a fd or a stream. */
308 if (data_file != NULL) (void)fclose(data_file);
309 else if (data_fd >= 0) (void)close(data_fd);
311 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
312 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
317 if (smtp_batched_input)
318 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
319 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
320 smtp_active_hostname, msg);
323 /* Exit from the program (non-BSMTP cases) */
325 exim_exit(EXIT_FAILURE);
329 /*************************************************
330 * Data read timeout *
331 *************************************************/
333 /* Handler function for timeouts that occur while reading the data that
336 Argument: the signal number
341 data_timeout_handler(int sig)
345 sig = sig; /* Keep picky compilers happy */
349 msg = US"SMTP incoming data timeout";
350 log_write(L_lost_incoming_connection,
351 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
353 (sender_fullhost != NULL)? sender_fullhost : US"local process",
358 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
359 log_write(L_lost_incoming_connection,
360 LOG_MAIN, "timed out while reading local message");
363 receive_bomb_out(US"data-timeout", msg); /* Does not return */
368 /*************************************************
369 * local_scan() timeout *
370 *************************************************/
372 /* Handler function for timeouts that occur while running a local_scan()
375 Argument: the signal number
380 local_scan_timeout_handler(int sig)
382 sig = sig; /* Keep picky compilers happy */
383 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
384 "message temporarily rejected (size %d)", message_size);
385 /* Does not return */
386 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
391 /*************************************************
392 * local_scan() crashed *
393 *************************************************/
395 /* Handler function for signals that occur while running a local_scan()
398 Argument: the signal number
403 local_scan_crash_handler(int sig)
405 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
406 "signal %d - message temporarily rejected (size %d)", sig, message_size);
407 /* Does not return */
408 receive_bomb_out(US"local-scan-error", US"local verification problem");
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(US"signal-exit", 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)
567 register int linelength = 0;
569 /* Handle the case when only EOF terminates the message */
573 register int last_ch = '\n';
575 for (; (ch = (RECEIVE_GETC)()) != EOF; last_ch = ch)
577 if (ch == 0) body_zerocount++;
578 if (last_ch == '\r' && ch != '\n')
580 if (linelength > max_received_linelength)
581 max_received_linelength = linelength;
583 if (fputc('\n', fout) == EOF) return END_WERROR;
587 if (ch == '\r') continue;
589 if (fputc(ch, fout) == EOF) return END_WERROR;
592 if (linelength > max_received_linelength)
593 max_received_linelength = linelength;
598 if (++message_size > thismessage_size_limit) return END_SIZE;
603 if (linelength > max_received_linelength)
604 max_received_linelength = linelength;
605 if (fputc('\n', fout) == EOF) return END_WERROR;
613 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
617 while ((ch = (RECEIVE_GETC)()) != EOF)
619 if (ch == 0) body_zerocount++;
622 case 0: /* Normal state (previous char written) */
626 if (linelength > max_received_linelength)
627 max_received_linelength = linelength;
632 { ch_state = 2; continue; }
635 case 1: /* After written "\n" */
636 if (ch == '.') { ch_state = 3; continue; }
637 if (ch != '\n') ch_state = 0; else linelength = -1;
641 body_linecount++; /* After unwritten "\r" */
642 if (linelength > max_received_linelength)
643 max_received_linelength = linelength;
651 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
652 if (ch == '\r') continue;
658 case 3: /* After "\n." (\n written, dot not) */
659 if (ch == '\n') return END_DOT;
660 if (ch == '\r') { ch_state = 4; continue; }
663 if (fputc('.', fout) == EOF) return END_WERROR;
667 case 4: /* After "\n.\r" (\n written, rest not) */
668 if (ch == '\n') return END_DOT;
671 if (fputs(".\n", fout) == EOF) return END_WERROR;
672 if (ch == '\r') { ch_state = 2; continue; }
678 if (fputc(ch, fout) == EOF) return END_WERROR;
679 if (++message_size > thismessage_size_limit) return END_SIZE;
682 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
683 the message ends with a newline, and we must also write any characters that
684 were saved up while testing for an ending dot. */
688 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
689 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
690 message_size += Ustrlen(ends[ch_state]);
700 /*************************************************
701 * Read data portion of an SMTP message *
702 *************************************************/
704 /* This function is called to read the remainder of an SMTP message (after the
705 headers), or to skip over it when an error has occurred. In this case, the
706 output file is passed as NULL.
708 If any line begins with a dot, that character is skipped. The input should only
709 be successfully terminated by CR LF . CR LF unless it is local (non-network)
710 SMTP, in which case the CRs are optional, but...
712 FUDGE: It seems that sites on the net send out messages with just LF
713 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
714 we make the CRs optional in all cases.
716 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
717 well, so that there are no CRs in spooled messages. However, the message
718 terminating dot is not recognized between two bare CRs.
721 fout a FILE to which to write the message; NULL if skipping
723 Returns: One of the END_xxx values indicating why it stopped reading
727 read_message_data_smtp(FILE *fout)
731 register int linelength = 0;
733 while ((ch = (RECEIVE_GETC)()) != EOF)
735 if (ch == 0) body_zerocount++;
738 case 0: /* After LF or CRLF */
742 continue; /* Don't ever write . after LF */
746 /* Else fall through to handle as normal uschar. */
748 case 1: /* Normal state */
753 if (linelength > max_received_linelength)
754 max_received_linelength = linelength;
764 case 2: /* After (unwritten) CR */
766 if (linelength > max_received_linelength)
767 max_received_linelength = linelength;
776 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
777 if (ch != '\r') ch_state = 1; else continue;
781 case 3: /* After [CR] LF . */
789 ch_state = 1; /* The dot itself is removed */
792 case 4: /* After [CR] LF . CR */
793 if (ch == '\n') return END_DOT;
796 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
806 /* Add the character to the spool file, unless skipping; then loop for the
813 if (fputc(ch, fout) == EOF) return END_WERROR;
814 if (message_size > thismessage_size_limit) return END_SIZE;
818 /* Fall through here if EOF encountered. This indicates some kind of error,
819 since a correct message is terminated by [CR] LF . [CR] LF. */
827 /*************************************************
828 * Swallow SMTP message *
829 *************************************************/
831 /* This function is called when there has been some kind of error while reading
832 an SMTP message, and the remaining data may need to be swallowed. It is global
833 because it is called from smtp_closedown() to shut down an incoming call
836 Argument: a FILE from which to read the message
841 receive_swallow_smtp(void)
843 if (message_ended >= END_NOTENDED)
844 message_ended = read_message_data_smtp(NULL);
849 /*************************************************
850 * Handle lost SMTP connection *
851 *************************************************/
853 /* This function logs connection loss incidents and generates an appropriate
856 Argument: additional data for the message
857 Returns: the SMTP response
861 handle_lost_connection(uschar *s)
863 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
864 "%s lost while reading message data%s", smtp_get_connection_info(), s);
865 return US"421 Lost incoming connection";
871 /*************************************************
872 * Handle a non-smtp reception error *
873 *************************************************/
875 /* This function is called for various errors during the reception of non-SMTP
876 messages. It either sends a message to the sender of the problem message, or it
877 writes to the standard error stream.
880 errcode code for moan_to_sender(), identifying the error
881 text1 first message text, passed to moan_to_sender()
882 text2 second message text, used only for stderrr
883 error_rc code to pass to exim_exit if no problem
884 f FILE containing body of message (may be stdin)
885 hptr pointer to instore headers or NULL
887 Returns: calls exim_exit(), which does not return
891 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
892 FILE *f, header_line *hptr)
894 if (error_handling == ERRORS_SENDER)
898 eblock.text1 = text1;
899 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
900 error_rc = EXIT_FAILURE;
902 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
909 /*************************************************
910 * Add header lines set up by ACL *
911 *************************************************/
913 /* This function is called to add the header lines that were set up by
914 statements in an ACL to the list of headers in memory. It is done in two stages
915 like this, because when the ACL for RCPT is running, the other headers have not
916 yet been received. This function is called twice; once just before running the
917 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
918 are visible to the DATA ACL.
920 Originally these header lines were added at the end. Now there is support for
921 three different places: top, bottom, and after the Received: header(s). There
922 will always be at least one Received: header, even if it is marked deleted, and
923 even if something else has been put in front of it.
926 acl_name text to identify which ACL
932 add_acl_headers(uschar *acl_name)
934 header_line *h, *next;
935 header_line *last_received = NULL;
937 if (acl_added_headers == NULL) return;
938 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
940 for (h = acl_added_headers; h != NULL; h = next)
947 h->next = header_list;
949 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
953 if (last_received == NULL)
955 last_received = header_list;
956 while (!header_testname(last_received, US"Received", 8, FALSE))
957 last_received = last_received->next;
958 while (last_received->next != NULL &&
959 header_testname(last_received->next, US"Received", 8, FALSE))
960 last_received = last_received->next;
962 h->next = last_received->next;
963 last_received->next = h;
964 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
968 /* add header before any header which is NOT Received: or Resent- */
969 last_received = header_list;
970 while ( (last_received->next != NULL) &&
971 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
972 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
973 last_received = last_received->next;
974 /* last_received now points to the last Received: or Resent-* header
975 in an uninterrupted chain of those header types (seen from the beginning
976 of all headers. Our current header must follow it. */
977 h->next = last_received->next;
978 last_received->next = h;
979 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
984 header_last->next = h;
988 if (h->next == NULL) header_last = h;
990 /* Check for one of the known header types (From:, To:, etc.) though in
991 practice most added headers are going to be "other". Lower case
992 identification letters are never stored with the header; they are used
993 for existence tests when messages are received. So discard any lower case
996 h->type = header_checkname(h, FALSE);
997 if (h->type >= 'a') h->type = htype_other;
999 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1002 acl_added_headers = NULL;
1003 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1008 /*************************************************
1009 * Add host information for log line *
1010 *************************************************/
1012 /* Called for acceptance and rejecting log lines. This adds information about
1013 the calling host to a string that is being built dynamically.
1016 s the dynamic string
1017 sizeptr points to the size variable
1018 ptrptr points to the pointer variable
1020 Returns: the extended string
1024 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1026 if (sender_fullhost != NULL)
1028 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1029 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1030 interface_address != NULL)
1032 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1034 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1037 if (sender_ident != NULL)
1038 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1039 if (received_protocol != NULL)
1040 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1046 #ifdef WITH_CONTENT_SCAN
1048 /*************************************************
1049 * Run the MIME ACL on a message *
1050 *************************************************/
1052 /* This code is in a subroutine so that it can be used for both SMTP
1053 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1056 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1057 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1058 smtp_reply_ptr Where SMTP reply is being built
1059 blackholed_by_ptr Where "blackholed by" message is being built
1061 Returns: TRUE to carry on; FALSE to abandon the message
1065 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1066 uschar **blackholed_by_ptr)
1069 uschar rfc822_file_path[2048];
1070 unsigned long mbox_size;
1071 header_line *my_headerlist;
1072 uschar *user_msg, *log_msg;
1073 int mime_part_count_buffer = -1;
1076 memset(CS rfc822_file_path,0,2048);
1078 /* check if it is a MIME message */
1079 my_headerlist = header_list;
1080 while (my_headerlist != NULL)
1082 /* skip deleted headers */
1083 if (my_headerlist->type == '*')
1085 my_headerlist = my_headerlist->next;
1088 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1090 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1093 my_headerlist = my_headerlist->next;
1096 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1100 /* make sure the eml mbox file is spooled up */
1101 mbox_file = spool_mbox(&mbox_size);
1102 if (mbox_file == NULL) {
1103 /* error while spooling */
1104 log_write(0, LOG_MAIN|LOG_PANIC,
1105 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1106 Uunlink(spool_name);
1108 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1109 message_id[0] = 0; /* Indicate no message accepted */
1110 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1111 return FALSE; /* Indicate skip to end of receive function */
1117 mime_part_count = -1;
1118 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1119 (void)fclose(mbox_file);
1121 if (Ustrlen(rfc822_file_path) > 0)
1123 mime_part_count = mime_part_count_buffer;
1125 if (unlink(CS rfc822_file_path) == -1)
1127 log_write(0, LOG_PANIC,
1128 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1133 /* check if we must check any message/rfc822 attachments */
1136 uschar temp_path[1024];
1138 struct dirent *entry;
1141 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1144 tempdir = opendir(CS temp_path);
1148 entry = readdir(tempdir);
1149 if (entry == NULL) break;
1150 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1152 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1153 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1161 mbox_file = Ufopen(rfc822_file_path,"rb");
1162 if (mbox_file == NULL)
1164 log_write(0, LOG_PANIC,
1165 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1166 unlink(CS rfc822_file_path);
1169 /* set RFC822 expansion variable */
1171 mime_part_count_buffer = mime_part_count;
1172 goto MIME_ACL_CHECK;
1177 add_acl_headers(US"MIME");
1180 recipients_count = 0;
1181 *blackholed_by_ptr = US"MIME ACL";
1185 Uunlink(spool_name);
1187 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1188 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1189 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1190 message_id[0] = 0; /* Indicate no message accepted */
1191 return FALSE; /* Cause skip to end of receive function */
1197 #endif /* WITH_CONTENT_SCAN */
1200 /*************************************************
1202 *************************************************/
1204 /* Receive a message on the given input, and put it into a pair of spool files.
1205 Either a non-null list of recipients, or the extract flag will be true, or
1206 both. The flag sender_local is true for locally generated messages. The flag
1207 submission_mode is true if an ACL has obeyed "control = submission". The flag
1208 suppress_local_fixups is true if an ACL has obeyed "control =
1209 suppress_local_fixups". The flag smtp_input is true if the message is to be
1210 handled using SMTP conventions about termination and lines starting with dots.
1211 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1213 If a message was successfully read, message_id[0] will be non-zero.
1215 The general actions of this function are:
1217 . Read the headers of the message (if any) into a chain of store
1220 . If there is a "sender:" header and the message is locally originated,
1221 throw it away, unless the caller is trusted, or unless
1222 active_local_sender_retain is set - which can only happen if
1223 active_local_from_check is false.
1225 . If recipients are to be extracted from the message, build the
1226 recipients list from the headers, removing any that were on the
1227 original recipients list (unless extract_addresses_remove_arguments is
1228 false), and at the same time, remove any bcc header that may be present.
1230 . Get the spool file for the data, sort out its unique name, open
1231 and lock it (but don't give it the name yet).
1233 . Generate a "Message-Id" header if the message doesn't have one, for
1234 locally-originated messages.
1236 . Generate a "Received" header.
1238 . Ensure the recipients list is fully qualified and rewritten if necessary.
1240 . If there are any rewriting rules, apply them to the sender address
1241 and also to the headers.
1243 . If there is no from: header, generate one, for locally-generated messages
1244 and messages in "submission mode" only.
1246 . If the sender is local, check that from: is correct, and if not, generate
1247 a Sender: header, unless message comes from a trusted caller, or this
1248 feature is disabled by active_local_from_check being false.
1250 . If there is no "date" header, generate one, for locally-originated
1251 or submission mode messages only.
1253 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1254 dot_ends mode, to the data file. Leave it open, to hold the lock.
1256 . Write the envelope and the headers to a new file.
1258 . Set the name for the header file; close it.
1260 . Set the name for the data file; close it.
1262 Because this function can potentially be called many times in a single
1263 SMTP connection, all store should be got by store_get(), so that it will be
1264 automatically retrieved after the message is accepted.
1266 FUDGE: It seems that sites on the net send out messages with just LF
1267 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1268 we make the CRs optional in all cases.
1270 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1271 new regime is now in place in which bare CRs in header lines are turned into LF
1272 followed by a space, so as not to terminate the header line.
1274 February 2004: A bare LF in a header line in a message whose first line was
1275 terminated by CRLF is treated in the same way as a bare CR.
1278 extract_recip TRUE if recipients are to be extracted from the message's
1281 Returns: TRUE there are more messages to be read (SMTP input)
1282 FALSE there are no more messages to be read (non-SMTP input
1283 or SMTP connection collapsed, or other failure)
1285 When reading a message for filter testing, the returned value indicates
1286 whether the headers (which is all that is read) were terminated by '.' or
1290 receive_msg(BOOL extract_recip)
1294 int process_info_len = Ustrlen(process_info);
1295 int error_rc = (error_handling == ERRORS_SENDER)?
1296 errors_sender_rc : EXIT_FAILURE;
1297 int header_size = 256;
1298 int start, end, domain, size, sptr;
1301 int prevlines_length = 0;
1303 register int ptr = 0;
1305 BOOL contains_resent_headers = FALSE;
1306 BOOL extracted_ignored = FALSE;
1307 BOOL first_line_ended_crlf = TRUE_UNSET;
1308 BOOL smtp_yield = TRUE;
1311 BOOL resents_exist = FALSE;
1312 uschar *resent_prefix = US"";
1313 uschar *blackholed_by = NULL;
1314 uschar *blackhole_log_msg = US"";
1317 error_block *bad_addresses = NULL;
1319 uschar *frozen_by = NULL;
1320 uschar *queued_by = NULL;
1323 struct stat statbuf;
1325 /* Final message to give to SMTP caller, and messages from ACLs */
1327 uschar *smtp_reply = NULL;
1328 uschar *user_msg, *log_msg;
1330 /* Working header pointers */
1332 header_line *h, *next;
1334 /* Flags for noting the existence of certain headers (only one left) */
1336 BOOL date_header_exists = FALSE;
1338 /* Pointers to receive the addresses of headers whose contents we need. */
1340 header_line *from_header = NULL;
1341 header_line *subject_header = NULL;
1342 header_line *msgid_header = NULL;
1343 header_line *received_header;
1345 /* Variables for use when building the Received: header. */
1351 /* Release any open files that might have been cached while preparing to
1352 accept the message - e.g. by verifying addresses - because reading a message
1353 might take a fair bit of real time. */
1357 /* Initialize the chain of headers by setting up a place-holder for Received:
1358 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1359 pointing to the end of the chain to make adding headers simple. */
1361 received_header = header_list = header_last = store_get(sizeof(header_line));
1362 header_list->next = NULL;
1363 header_list->type = htype_old;
1364 header_list->text = NULL;
1365 header_list->slen = 0;
1367 /* Control block for the next header to be read. */
1369 next = store_get(sizeof(header_line));
1370 next->text = store_get(header_size);
1372 /* Initialize message id to be null (indicating no message read), and the
1373 header names list to be the normal list. Indicate there is no data file open
1374 yet, initialize the size and warning count, and deal with no size limit. */
1382 received_count = 1; /* For the one we will add */
1384 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1386 /* While reading the message, the following counts are computed. */
1388 message_linecount = body_linecount = body_zerocount =
1389 max_received_linelength = 0;
1391 #ifdef EXPERIMENTAL_DOMAINKEYS
1392 /* Call into DK to set up the context. Check if DK is to be run are carried out
1393 inside dk_exim_verify_init(). */
1394 dk_exim_verify_init();
1397 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1398 ids, and fractions of a second are required. See the comments that precede the
1399 message id creation below. */
1401 (void)gettimeofday(&message_id_tv, NULL);
1403 /* For other uses of the received time we can operate with granularity of one
1404 second, and for that we use the global variable received_time. This is for
1405 things like ultimate message timeouts. */
1407 received_time = message_id_tv.tv_sec;
1409 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1410 happen in the smtp_getc() function when it refills its buffer. */
1412 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1414 /* If not SMTP input, timeout happens only if configured, and we just set a
1415 single timeout for the whole message. */
1417 else if (receive_timeout > 0)
1419 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1420 alarm(receive_timeout);
1423 /* SIGTERM and SIGINT are caught always. */
1425 signal(SIGTERM, data_sigterm_sigint_handler);
1426 signal(SIGINT, data_sigterm_sigint_handler);
1428 /* Header lines in messages are not supposed to be very long, though when
1429 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1430 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1431 storing the header, and extend this as necessary using string_cat().
1433 To cope with total lunacies, impose an upper limit on the length of the header
1434 section of the message, as otherwise the store will fill up. We must also cope
1435 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1436 Folded header lines are joined into one string, leaving the '\n' characters
1437 inside them, so that writing them out reproduces the input.
1439 Loop for each character of each header; the next structure for chaining the
1440 header is set up already, with ptr the offset of the next character in
1445 int ch = (RECEIVE_GETC)();
1447 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1448 SMTP must have a correct "." terminator. */
1450 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1452 smtp_reply = handle_lost_connection(US" (header)");
1454 goto TIDYUP; /* Skip to end of function */
1457 /* See if we are at the current header's size limit - there must be at least
1458 four bytes left. This allows for the new character plus a zero, plus two for
1459 extra insertions when we are playing games with dots and carriage returns. If
1460 we are at the limit, extend the text buffer. This could have been done
1461 automatically using string_cat() but because this is a tightish loop storing
1462 only one character at a time, we choose to do it inline. Normally
1463 store_extend() will be able to extend the block; only at the end of a big
1464 store block will a copy be needed. To handle the case of very long headers
1465 (and sometimes lunatic messages can have ones that are 100s of K long) we
1466 call store_release() for strings that have been copied - if the string is at
1467 the start of a block (and therefore the only thing in it, because we aren't
1468 doing any other gets), the block gets freed. We can only do this because we
1469 know there are no other calls to store_get() going on. */
1471 if (ptr >= header_size - 4)
1473 int oldsize = header_size;
1474 /* header_size += 256; */
1476 if (!store_extend(next->text, oldsize, header_size))
1478 uschar *newtext = store_get(header_size);
1479 memcpy(newtext, next->text, ptr);
1480 store_release(next->text);
1481 next->text = newtext;
1485 /* Cope with receiving a binary zero. There is dispute about whether
1486 these should be allowed in RFC 822 messages. The middle view is that they
1487 should not be allowed in headers, at least. Exim takes this attitude at
1488 the moment. We can't just stomp on them here, because we don't know that
1489 this line is a header yet. Set a flag to cause scanning later. */
1491 if (ch == 0) had_zero++;
1493 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1494 those from data files use just LF. Treat LF in local SMTP input as a
1495 terminator too. Treat EOF as a line terminator always. */
1497 if (ch == EOF) goto EOL;
1499 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1500 other MTAs accept this. We are therefore forced into this "liberalisation"
1501 too, so we accept LF as a line terminator whatever the source of the message.
1502 However, if the first line of the message ended with a CRLF, we treat a bare
1503 LF specially by inserting a white space after it to ensure that the header
1504 line is not terminated. */
1508 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1509 else if (first_line_ended_crlf) RECEIVE_UNGETC(' ');
1513 /* This is not the end of the line. If this is SMTP input and this is
1514 the first character in the line and it is a "." character, ignore it.
1515 This implements the dot-doubling rule, though header lines starting with
1516 dots aren't exactly common. They are legal in RFC 822, though. If the
1517 following is CRLF or LF, this is the line that that terminates the
1518 entire message. We set message_ended to indicate this has happened (to
1519 prevent further reading), and break out of the loop, having freed the
1520 empty header, and set next = NULL to indicate no data line. */
1522 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1524 ch = (RECEIVE_GETC)();
1527 ch = (RECEIVE_GETC)();
1531 ch = '\r'; /* Revert to CR */
1536 message_ended = END_DOT;
1539 break; /* End character-reading loop */
1542 /* For non-SMTP input, the dot at the start of the line was really a data
1543 character. What is now in ch is the following character. We guaranteed
1544 enough space for this above. */
1548 next->text[ptr++] = '.';
1553 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1554 remember this case if this is the first line ending. */
1558 ch = (RECEIVE_GETC)();
1561 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1565 /* Otherwise, put back the character after CR, and turn the bare CR
1568 ch = (RECEIVE_UNGETC)(ch);
1569 next->text[ptr++] = '\n';
1574 /* We have a data character for the header line. */
1576 next->text[ptr++] = ch; /* Add to buffer */
1577 message_size++; /* Total message size so far */
1579 /* Handle failure due to a humungously long header section. The >= allows
1580 for the terminating \n. Add what we have so far onto the headers list so
1581 that it gets reflected in any error message, and back up the just-read
1584 if (message_size >= header_maxsize)
1586 next->text[ptr] = 0;
1588 next->type = htype_other;
1590 header_last->next = next;
1593 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1594 "%s (more than %d characters): message abandoned",
1595 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1599 smtp_reply = US"552 Message header is ridiculously long";
1600 receive_swallow_smtp();
1601 goto TIDYUP; /* Skip to end of function */
1606 give_local_error(ERRMESS_VLONGHEADER,
1607 string_sprintf("message header longer than %d characters received: "
1608 "message not accepted", header_maxsize), US"", error_rc, stdin,
1610 /* Does not return */
1614 continue; /* With next input character */
1616 /* End of header line reached */
1620 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1622 receive_linecount++;
1623 message_linecount++;
1625 /* Keep track of maximum line length */
1627 if (ptr - prevlines_length > max_received_linelength)
1628 max_received_linelength = ptr - prevlines_length;
1629 prevlines_length = ptr + 1;
1631 /* Now put in the terminating newline. There is always space for
1632 at least two more characters. */
1634 next->text[ptr++] = '\n';
1637 /* A blank line signals the end of the headers; release the unwanted
1638 space and set next to NULL to indicate this. */
1647 /* There is data in the line; see if the next input character is a
1648 whitespace character. If it is, we have a continuation of this header line.
1649 There is always space for at least one character at this point. */
1653 int nextch = (RECEIVE_GETC)();
1654 if (nextch == ' ' || nextch == '\t')
1656 next->text[ptr++] = nextch;
1658 continue; /* Iterate the loop */
1660 else if (nextch != EOF) (RECEIVE_UNGETC)(nextch); /* For next time */
1661 else ch = EOF; /* Cause main loop to exit at end */
1664 /* We have got to the real line end. Terminate the string and release store
1665 beyond it. If it turns out to be a real header, internal binary zeros will
1666 be squashed later. */
1668 next->text[ptr] = 0;
1670 store_reset(next->text + ptr + 1);
1672 /* Check the running total size against the overall message size limit. We
1673 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1674 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1675 headers - the code to read the body will then also hit the buffer. */
1677 if (message_size > thismessage_size_limit) break;
1679 /* A line that is not syntactically correct for a header also marks
1680 the end of the headers. In this case, we leave next containing the
1681 first data line. This might actually be several lines because of the
1682 continuation logic applied above, but that doesn't matter.
1684 It turns out that smail, and presumably sendmail, accept leading lines
1687 From ph10 Fri Jan 5 12:35 GMT 1996
1689 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1690 find any documentation of this, but for compatibility it had better be
1691 accepted. Exim restricts it to the case of non-smtp messages, and
1692 treats it as an alternative to the -f command line option. Thus it is
1693 ignored except for trusted users or filter testing. Otherwise it is taken
1694 as the sender address, unless -f was used (sendmail compatibility).
1696 It further turns out that some UUCPs generate the From_line in a different
1699 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1701 The regex for matching these things is now capable of recognizing both
1702 formats (including 2- and 4-digit years in the latter). In fact, the regex
1703 is now configurable, as is the expansion string to fish out the sender.
1705 Even further on it has been discovered that some broken clients send
1706 these lines in SMTP messages. There is now an option to ignore them from
1707 specified hosts or networks. Sigh. */
1709 if (header_last == header_list &&
1712 (sender_host_address != NULL &&
1713 verify_check_host(&ignore_fromline_hosts) == OK)
1715 (sender_host_address == NULL && ignore_fromline_local)
1717 regex_match_and_setup(regex_From, next->text, 0, -1))
1719 if (!sender_address_forced)
1721 uschar *uucp_sender = expand_string(uucp_from_sender);
1722 if (uucp_sender == NULL)
1724 log_write(0, LOG_MAIN|LOG_PANIC,
1725 "expansion of \"%s\" failed after matching "
1726 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1730 int start, end, domain;
1732 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1733 &start, &end, &domain, TRUE);
1734 if (newsender != NULL)
1736 if (domain == 0 && newsender[0] != 0)
1737 newsender = rewrite_address_qualify(newsender, FALSE);
1739 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1741 sender_address = newsender;
1743 if (trusted_caller || filter_test != FTEST_NONE)
1745 authenticated_sender = NULL;
1746 originator_name = US"";
1747 sender_local = FALSE;
1750 if (filter_test != FTEST_NONE)
1751 printf("Sender taken from \"From \" line\n");
1758 /* Not a leading "From " line. Check to see if it is a valid header line.
1759 Header names may contain any non-control characters except space and colon,
1764 uschar *p = next->text;
1766 /* If not a valid header line, break from the header reading loop, leaving
1767 next != NULL, indicating that it holds the first line of the body. */
1769 if (isspace(*p)) break;
1770 while (mac_isgraph(*p) && *p != ':') p++;
1771 while (isspace(*p)) p++;
1774 body_zerocount = had_zero;
1778 /* We have a valid header line. If there were any binary zeroes in
1779 the line, stomp on them here. */
1782 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1784 /* It is perfectly legal to have an empty continuation line
1785 at the end of a header, but it is confusing to humans
1786 looking at such messages, since it looks like a blank line.
1787 Reduce confusion by removing redundant white space at the
1788 end. We know that there is at least one printing character
1789 (the ':' tested for above) so there is no danger of running
1792 p = next->text + ptr - 2;
1795 while (*p == ' ' || *p == '\t') p--;
1796 if (*p != '\n') break;
1797 ptr = (p--) - next->text + 1;
1798 message_size -= next->slen - ptr;
1799 next->text[ptr] = 0;
1803 /* Add the header to the chain */
1805 next->type = htype_other;
1807 header_last->next = next;
1810 /* Check the limit for individual line lengths. This comes after adding to
1811 the chain so that the failing line is reflected if a bounce is generated
1812 (for a local message). */
1814 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1816 log_write(0, LOG_MAIN, "overlong message header line received from "
1817 "%s (more than %d characters): message abandoned",
1818 sender_host_unknown? sender_ident : sender_fullhost,
1819 header_line_maxsize);
1823 smtp_reply = US"552 A message header line is too long";
1824 receive_swallow_smtp();
1825 goto TIDYUP; /* Skip to end of function */
1830 give_local_error(ERRMESS_VLONGHDRLINE,
1831 string_sprintf("message header line longer than %d characters "
1832 "received: message not accepted", header_line_maxsize), US"",
1833 error_rc, stdin, header_list->next);
1834 /* Does not return */
1838 /* Note if any resent- fields exist. */
1840 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1842 resents_exist = TRUE;
1843 resent_prefix = US"Resent-";
1847 /* The line has been handled. If we have hit EOF, break out of the loop,
1848 indicating no pending data line. */
1850 if (ch == EOF) { next = NULL; break; }
1852 /* Set up for the next header */
1855 next = store_get(sizeof(header_line));
1856 next->text = store_get(header_size);
1859 prevlines_length = 0;
1860 } /* Continue, starting to read the next header */
1862 /* At this point, we have read all the headers into a data structure in main
1863 store. The first header is still the dummy placeholder for the Received: header
1864 we are going to generate a bit later on. If next != NULL, it contains the first
1865 data line - which terminated the headers before reaching a blank line (not the
1870 debug_printf(">>Headers received:\n");
1871 for (h = header_list->next; h != NULL; h = h->next)
1872 debug_printf("%s", h->text);
1876 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1877 is dropped immediately after valid headers, the next thing we will see is EOF.
1878 We must test for this specially, as further down the reading of the data is
1879 skipped if already at EOF. */
1881 if (smtp_input && (receive_feof)())
1883 smtp_reply = handle_lost_connection(US" (after header)");
1885 goto TIDYUP; /* Skip to end of function */
1888 /* If this is a filter test run and no headers were read, output a warning
1889 in case there is a mistake in the test message. */
1891 if (filter_test != FTEST_NONE && header_list->next == NULL)
1892 printf("Warning: no message headers read\n");
1895 /* Scan the headers to identify them. Some are merely marked for later
1896 processing; some are dealt with here. */
1898 for (h = header_list->next; h != NULL; h = h->next)
1900 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1901 if (is_resent) contains_resent_headers = TRUE;
1903 switch (header_checkname(h, is_resent))
1906 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
1910 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
1913 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1916 date_header_exists = !resents_exist || is_resent;
1919 /* Same comments as about Return-Path: below. */
1921 case htype_delivery_date:
1922 if (delivery_date_remove) h->type = htype_old;
1925 /* Same comments as about Return-Path: below. */
1927 case htype_envelope_to:
1928 if (envelope_to_remove) h->type = htype_old;
1931 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1932 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1933 header consists of just the login id of the user who called Exim, rewrite
1934 it with the gecos field first. Apply this rule to Resent-From: if there
1935 are resent- fields. */
1938 h->type = htype_from;
1939 if (!resents_exist || is_resent)
1944 uschar *s = Ustrchr(h->text, ':') + 1;
1945 while (isspace(*s)) s++;
1946 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1948 uschar *name = is_resent? US"Resent-From" : US"From";
1949 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1950 originator_login, qualify_domain_sender);
1951 from_header = header_last;
1952 h->type = htype_old;
1953 DEBUG(D_receive|D_rewrite)
1954 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1960 /* Identify the Message-id: header for generating "in-reply-to" in the
1961 autoreply transport. For incoming logging, save any resent- value. In both
1962 cases, take just the first of any multiples. */
1965 if (msgid_header == NULL && (!resents_exist || is_resent))
1972 /* Flag all Received: headers */
1974 case htype_received:
1975 h->type = htype_received;
1979 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1981 case htype_reply_to:
1982 h->type = htype_reply_to;
1985 /* The Return-path: header is supposed to be added to messages when
1986 they leave the SMTP system. We shouldn't receive messages that already
1987 contain Return-path. However, since Exim generates Return-path: on
1988 local delivery, resent messages may well contain it. We therefore
1989 provide an option (which defaults on) to remove any Return-path: headers
1990 on input. Removal actually means flagging as "old", which prevents the
1991 header being transmitted with the message. */
1993 case htype_return_path:
1994 if (return_path_remove) h->type = htype_old;
1996 /* If we are testing a mail filter file, use the value of the
1997 Return-Path: header to set up the return_path variable, which is not
1998 otherwise set. However, remove any <> that surround the address
1999 because the variable doesn't have these. */
2001 if (filter_test != FTEST_NONE)
2003 uschar *start = h->text + 12;
2004 uschar *end = start + Ustrlen(start);
2005 while (isspace(*start)) start++;
2006 while (end > start && isspace(end[-1])) end--;
2007 if (*start == '<' && end[-1] == '>')
2012 return_path = string_copyn(start, end - start);
2013 printf("Return-path taken from \"Return-path:\" header line\n");
2017 /* If there is a "Sender:" header and the message is locally originated,
2018 and from an untrusted caller and suppress_local_fixups is not set, or if we
2019 are in submission mode for a remote message, mark it "old" so that it will
2020 not be transmitted with the message, unless active_local_sender_retain is
2021 set. (This can only be true if active_local_from_check is false.) If there
2022 are any resent- headers in the message, apply this rule to Resent-Sender:
2023 instead of Sender:. Messages with multiple resent- header sets cannot be
2024 tidily handled. (For this reason, at least one MUA - Pine - turns old
2025 resent- headers into X-resent- headers when resending, leaving just one
2029 h->type = ((!active_local_sender_retain &&
2031 (sender_local && !trusted_caller && !suppress_local_fixups)
2035 (!resents_exist||is_resent))?
2036 htype_old : htype_sender;
2039 /* Remember the Subject: header for logging. There is no Resent-Subject */
2045 /* "To:" gets flagged, and the existence of a recipient header is noted,
2046 whether it's resent- or not. */
2051 to_or_cc_header_exists = TRUE;
2057 /* Extract recipients from the headers if that is required (the -t option).
2058 Note that this is documented as being done *before* any address rewriting takes
2059 place. There are two possibilities:
2061 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2062 recipients already listed are to be REMOVED from the message. Smail 3 works
2063 like this. We need to build a non-recipients tree for that list, because in
2064 subsequent processing this data is held in a tree and that's what the
2065 spool_write_header() function expects. Make sure that non-recipient addresses
2066 are fully qualified and rewritten if necessary.
2068 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2069 those in the command line arguments (and it is rumoured some other MTAs do
2070 this). Therefore, there is an option to make Exim behave this way.
2072 *** Notes on "Resent-" header lines ***
2074 The presence of resent-headers in the message makes -t horribly ambiguous.
2075 Experiments with sendmail showed that it uses recipients for all resent-
2076 headers, totally ignoring the concept of "sets of resent- headers" as described
2077 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2078 with all the addresses in one instance of each header.
2080 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2081 error for -t if there were resent- headers in the message. However, after a
2082 discussion on the mailing list, I've learned that there are MUAs that use
2083 resent- headers with -t, and also that the stuff about sets of resent- headers
2084 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2085 message with -t and resent- header lines makes sure that only *its* resent-
2086 headers are present; previous ones are often renamed as X-resent- for example.
2088 Consequently, Exim has been changed so that, if any resent- header lines are
2089 present, the recipients are taken from all of the appropriate resent- lines,
2090 and not from the ordinary To:, Cc:, etc. */
2095 error_block **bnext = &bad_addresses;
2097 if (extract_addresses_remove_arguments)
2099 while (recipients_count-- > 0)
2101 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2102 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2103 tree_add_nonrecipient(s);
2105 recipients_list = NULL;
2106 recipients_count = recipients_list_max = 0;
2109 /* Now scan the headers */
2111 for (h = header_list->next; h != NULL; h = h->next)
2113 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2114 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2116 uschar *s = Ustrchr(h->text, ':') + 1;
2117 while (isspace(*s)) s++;
2119 parse_allow_group = TRUE; /* Allow address group syntax */
2123 uschar *ss = parse_find_address_end(s, FALSE);
2124 uschar *recipient, *errmess, *p, *pp;
2125 int start, end, domain;
2127 /* Check on maximum */
2129 if (recipients_max > 0 && ++rcount > recipients_max)
2131 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2132 US"message rejected: ", error_rc, stdin, NULL);
2133 /* Does not return */
2136 /* Make a copy of the address, and remove any internal newlines. These
2137 may be present as a result of continuations of the header line. The
2138 white space that follows the newline must not be removed - it is part
2141 pp = recipient = store_get(ss - s + 1);
2142 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2144 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2147 /* Keep a list of all the bad addresses so we can send a single
2148 error message at the end. However, an empty address is not an error;
2149 just ignore it. This can come from an empty group list like
2151 To: Recipients of list:;
2153 If there are no recipients at all, an error will occur later. */
2155 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2157 int len = Ustrlen(s);
2158 error_block *b = store_get(sizeof(error_block));
2159 while (len > 0 && isspace(s[len-1])) len--;
2161 b->text1 = string_printing(string_copyn(s, len));
2167 /* If the recipient is already in the nonrecipients tree, it must
2168 have appeared on the command line with the option extract_addresses_
2169 remove_arguments set. Do not add it to the recipients, and keep a note
2170 that this has happened, in order to give a better error if there are
2171 no recipients left. */
2173 else if (recipient != NULL)
2175 if (tree_search(tree_nonrecipients, recipient) == NULL)
2176 receive_add_recipient(recipient, -1);
2178 extracted_ignored = TRUE;
2181 /* Move on past this address */
2183 s = ss + (*ss? 1:0);
2184 while (isspace(*s)) s++;
2185 } /* Next address */
2187 parse_allow_group = FALSE; /* Reset group syntax flags */
2188 parse_found_group = FALSE;
2190 /* If this was the bcc: header, mark it "old", which means it
2191 will be kept on the spool, but not transmitted as part of the
2194 if (h->type == htype_bcc) h->type = htype_old;
2195 } /* For appropriate header line */
2196 } /* For each header line */
2200 /* Now build the unique message id. This has changed several times over the
2201 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2202 Retaining all the history in the comment has become too unwieldy - read
2203 previous release sources if you want it.
2205 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2206 The first part is the current time, in seconds. The second part is the current
2207 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2208 can hold a number in the range 0-3843. It used to be a computed sequence
2209 number, but is now the fractional component of the current time in units of
2210 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2211 received, Exim ensures that the timer has ticked at the appropriate level
2212 before proceeding, to avoid duplication if the pid happened to be re-used
2213 within the same time period. It seems likely that most messages will take at
2214 least half a millisecond to be received, so no delay will normally be
2215 necessary. At least for some time...
2217 There is a modification when localhost_number is set. Formerly this was allowed
2218 to be as large as 255. Now it is restricted to the range 0-16, and the final
2219 component of the message id becomes (localhost_number * 200) + fractional time
2220 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2222 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2223 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2224 still allows the tttttt field to hold a large enough number to last for some
2225 more decades, and the final two-digit field can hold numbers up to 1295, which
2226 is enough for milliseconds (instead of 1/2000 of a second).
2228 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2229 pid, so it is probably safe because pids have to be positive. The
2230 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2231 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2233 Note that string_base62() returns its data in a static storage block, so it
2234 must be copied before calling string_base62() again. It always returns exactly
2237 There doesn't seem to be anything in the RFC which requires a message id to
2238 start with a letter, but Smail was changed to ensure this. The external form of
2239 the message id (as supplied by string expansion) therefore starts with an
2240 additional leading 'E'. The spool file names do not include this leading
2241 letter and it is not used internally.
2243 NOTE: If ever the format of message ids is changed, the regular expression for
2244 checking that a string is in this format must be updated in a corresponding
2245 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2246 must also be changed to reflect the correct string length. Then, of course,
2247 other programs that rely on the message id format will need updating too. */
2249 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2250 message_id[6] = '-';
2251 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2253 /* Deal with the case where the host number is set. The value of the number was
2254 checked when it was read, to ensure it isn't too big. The timing granularity is
2255 left in id_resolution so that an appropriate wait can be done after receiving
2256 the message, if necessary (we hope it won't be). */
2258 if (host_number_string != NULL)
2260 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2261 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2262 string_base62((long int)(
2263 host_number * (1000000/id_resolution) +
2264 message_id_tv.tv_usec/id_resolution)) + 4);
2267 /* Host number not set: final field is just the fractional time at an
2268 appropriate resolution. */
2272 id_resolution = (BASE_62 == 62)? 500 : 1000;
2273 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2274 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2277 /* Add the current message id onto the current process info string if
2280 (void)string_format(process_info + process_info_len,
2281 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2283 /* If we are using multiple input directories, set up the one for this message
2284 to be the least significant base-62 digit of the time of arrival. Otherwise
2285 ensure that it is an empty string. */
2287 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2289 /* Now that we have the message-id, if there is no message-id: header, generate
2290 one, but only for local (without suppress_local_fixups) or submission mode
2291 messages. This can be user-configured if required, but we had better flatten
2292 any illegal characters therein. */
2294 if (msgid_header == NULL &&
2295 ((sender_host_address == NULL && !suppress_local_fixups)
2296 || submission_mode))
2299 uschar *id_text = US"";
2300 uschar *id_domain = primary_hostname;
2302 /* Permit only letters, digits, dots, and hyphens in the domain */
2304 if (message_id_domain != NULL)
2306 uschar *new_id_domain = expand_string(message_id_domain);
2307 if (new_id_domain == NULL)
2309 if (!expand_string_forcedfail)
2310 log_write(0, LOG_MAIN|LOG_PANIC,
2311 "expansion of \"%s\" (message_id_header_domain) "
2312 "failed: %s", message_id_domain, expand_string_message);
2314 else if (*new_id_domain != 0)
2316 id_domain = new_id_domain;
2317 for (p = id_domain; *p != 0; p++)
2318 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2322 /* Permit all characters except controls and RFC 2822 specials in the
2323 additional text part. */
2325 if (message_id_text != NULL)
2327 uschar *new_id_text = expand_string(message_id_text);
2328 if (new_id_text == NULL)
2330 if (!expand_string_forcedfail)
2331 log_write(0, LOG_MAIN|LOG_PANIC,
2332 "expansion of \"%s\" (message_id_header_text) "
2333 "failed: %s", message_id_text, expand_string_message);
2335 else if (*new_id_text != 0)
2337 id_text = new_id_text;
2338 for (p = id_text; *p != 0; p++)
2339 if (mac_iscntrl_or_special(*p)) *p = '-';
2343 /* Add the header line */
2345 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2346 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2349 /* If we are to log recipients, keep a copy of the raw ones before any possible
2350 rewriting. Must copy the count, because later ACLs and the local_scan()
2351 function may mess with the real recipients. */
2353 if ((log_extra_selector & LX_received_recipients) != 0)
2355 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2356 for (i = 0; i < recipients_count; i++)
2357 raw_recipients[i] = string_copy(recipients_list[i].address);
2358 raw_recipients_count = recipients_count;
2361 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2362 recipients will get here only if the conditions were right (allow_unqualified_
2363 recipient is TRUE). */
2365 for (i = 0; i < recipients_count; i++)
2366 recipients_list[i].address =
2367 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2368 global_rewrite_rules, rewrite_existflags);
2370 /* If there is no From: header, generate one for local (without
2371 suppress_local_fixups) or submission_mode messages. If there is no sender
2372 address, but the sender is local or this is a local delivery error, use the
2373 originator login. This shouldn't happen for genuine bounces, but might happen
2374 for autoreplies. The addition of From: must be done *before* checking for the
2375 possible addition of a Sender: header, because untrusted_set_sender allows an
2376 untrusted user to set anything in the envelope (which might then get info
2377 From:) but we still want to ensure a valid Sender: if it is required. */
2379 if (from_header == NULL &&
2380 ((sender_host_address == NULL && !suppress_local_fixups)
2381 || submission_mode))
2383 uschar *oname = US"";
2385 /* Use the originator_name if this is a locally submitted message and the
2386 caller is not trusted. For trusted callers, use it only if -F was used to
2387 force its value or if we have a non-SMTP message for which -f was not used
2388 to set the sender. */
2390 if (sender_host_address == NULL)
2392 if (!trusted_caller || sender_name_forced ||
2393 (!smtp_input && !sender_address_forced))
2394 oname = originator_name;
2397 /* For non-locally submitted messages, the only time we use the originator
2398 name is when it was forced by the /name= option on control=submission. */
2402 if (submission_name != NULL) oname = submission_name;
2405 /* Envelope sender is empty */
2407 if (sender_address[0] == 0)
2409 uschar *fromstart, *fromend;
2411 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2412 oname, (oname[0] == 0)? "" : " <");
2413 fromend = (oname[0] == 0)? US"" : US">";
2415 if (sender_local || local_error_message)
2417 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2418 local_part_quote(originator_login), qualify_domain_sender,
2421 else if (submission_mode && authenticated_id != NULL)
2423 if (submission_domain == NULL)
2425 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2426 local_part_quote(authenticated_id), qualify_domain_sender,
2429 else if (submission_domain[0] == 0) /* empty => whole address set */
2431 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2436 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2437 local_part_quote(authenticated_id), submission_domain,
2440 from_header = header_last; /* To get it checked for Sender: */
2444 /* There is a non-null envelope sender. Build the header using the original
2445 sender address, before any rewriting that might have been done while
2450 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2452 (oname[0] == 0)? "" : " <",
2453 (sender_address_unrewritten == NULL)?
2454 sender_address : sender_address_unrewritten,
2455 (oname[0] == 0)? "" : ">");
2457 from_header = header_last; /* To get it checked for Sender: */
2462 /* If the sender is local (without suppress_local_fixups), or if we are in
2463 submission mode and there is an authenticated_id, check that an existing From:
2464 is correct, and if not, generate a Sender: header, unless disabled. Any
2465 previously-existing Sender: header was removed above. Note that sender_local,
2466 as well as being TRUE if the caller of exim is not trusted, is also true if a
2467 trusted caller did not supply a -f argument for non-smtp input. To allow
2468 trusted callers to forge From: without supplying -f, we have to test explicitly
2469 here. If the From: header contains more than one address, then the call to
2470 parse_extract_address fails, and a Sender: header is inserted, as required. */
2472 if (from_header != NULL &&
2473 (active_local_from_check &&
2474 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2475 (submission_mode && authenticated_id != NULL))
2478 BOOL make_sender = TRUE;
2479 int start, end, domain;
2481 uschar *from_address =
2482 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2483 &start, &end, &domain, FALSE);
2484 uschar *generated_sender_address;
2486 if (submission_mode)
2488 if (submission_domain == NULL)
2490 generated_sender_address = string_sprintf("%s@%s",
2491 local_part_quote(authenticated_id), qualify_domain_sender);
2493 else if (submission_domain[0] == 0) /* empty => full address */
2495 generated_sender_address = string_sprintf("%s",
2500 generated_sender_address = string_sprintf("%s@%s",
2501 local_part_quote(authenticated_id), submission_domain);
2505 generated_sender_address = string_sprintf("%s@%s",
2506 local_part_quote(originator_login), qualify_domain_sender);
2508 /* Remove permitted prefixes and suffixes from the local part of the From:
2509 address before doing the comparison with the generated sender. */
2511 if (from_address != NULL)
2514 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2516 if (at != NULL) *at = 0;
2517 from_address += route_check_prefix(from_address, local_from_prefix);
2518 slen = route_check_suffix(from_address, local_from_suffix);
2521 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2522 from_address += slen;
2524 if (at != NULL) *at = '@';
2526 if (strcmpic(generated_sender_address, from_address) == 0 ||
2527 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2528 make_sender = FALSE;
2531 /* We have to cause the Sender header to be rewritten if there are
2532 appropriate rewriting rules. */
2536 if (submission_mode && submission_name == NULL)
2537 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2538 generated_sender_address);
2540 header_add(htype_sender, "%sSender: %s <%s>\n",
2542 submission_mode? submission_name : originator_name,
2543 generated_sender_address);
2546 /* Ensure that a non-null envelope sender address corresponds to the
2547 submission mode sender address. */
2549 if (submission_mode && sender_address[0] != 0)
2551 if (sender_address_unrewritten == NULL)
2552 sender_address_unrewritten = sender_address;
2553 sender_address = generated_sender_address;
2554 log_write(L_address_rewrite, LOG_MAIN,
2555 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2556 sender_address_unrewritten, generated_sender_address);
2561 /* If there are any rewriting rules, apply them to the sender address, unless
2562 it has already been rewritten as part of verification for SMTP input. */
2564 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2565 sender_address[0] != 0)
2567 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2568 global_rewrite_rules, rewrite_existflags);
2569 DEBUG(D_receive|D_rewrite)
2570 debug_printf("rewritten sender = %s\n", sender_address);
2574 /* The headers must be run through rewrite_header(), because it ensures that
2575 addresses are fully qualified, as well as applying any rewriting rules that may
2578 Qualification of header addresses in a message from a remote host happens only
2579 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2580 appropriate. For local messages, qualification always happens, unless -bnq is
2581 used to explicitly suppress it. No rewriting is done for an unqualified address
2582 that is left untouched.
2584 We start at the second header, skipping our own Received:. This rewriting is
2585 documented as happening *after* recipient addresses are taken from the headers
2586 by the -t command line option. An added Sender: gets rewritten here. */
2588 for (h = header_list->next; h != NULL; h = h->next)
2590 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2591 rewrite_existflags, TRUE);
2592 if (newh != NULL) h = newh;
2596 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2597 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2598 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2599 exists, this applies to the set of resent- headers rather than the normal set.
2601 The requirement for a recipient header has been removed in RFC 2822. At this
2602 point in the code, earlier versions of Exim added a To: header for locally
2603 submitted messages, and an empty Bcc: header for others. In the light of the
2604 changes in RFC 2822, this was dropped in November 2003. */
2607 /* If there is no date header, generate one if the message originates locally
2608 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2609 submission mode flag is set. Messages without Date: are not valid, but it seems
2610 to be more confusing if Exim adds one to all remotely-originated messages. */
2612 if (!date_header_exists &&
2613 ((sender_host_address == NULL && !suppress_local_fixups)
2614 || submission_mode))
2615 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2617 search_tidyup(); /* Free any cached resources */
2619 /* Show the complete set of headers if debugging. Note that the first one (the
2620 new Received:) has not yet been set. */
2624 debug_printf(">>Headers after rewriting and local additions:\n");
2625 for (h = header_list->next; h != NULL; h = h->next)
2626 debug_printf("%c %s", h->type, h->text);
2630 /* The headers are now complete in store. If we are running in filter
2631 testing mode, that is all this function does. Return TRUE if the message
2632 ended with a dot. */
2634 if (filter_test != FTEST_NONE)
2636 process_info[process_info_len] = 0;
2637 return message_ended == END_DOT;
2640 /* Open a new spool file for the data portion of the message. We need
2641 to access it both via a file descriptor and a stream. Try to make the
2642 directory if it isn't there. Note re use of sprintf: spool_directory
2643 is checked on input to be < 200 characters long. */
2645 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2647 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2650 if (errno == ENOENT)
2653 sprintf(CS temp, "input/%s", message_subdir);
2654 if (message_subdir[0] == 0) temp[5] = 0;
2655 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2656 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2659 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2660 spool_name, strerror(errno));
2663 /* Make sure the file's group is the Exim gid, and double-check the mode
2664 because the group setting doesn't always get set automatically. */
2666 (void)fchown(data_fd, exim_uid, exim_gid);
2667 (void)fchmod(data_fd, SPOOL_MODE);
2669 /* We now have data file open. Build a stream for it and lock it. We lock only
2670 the first line of the file (containing the message ID) because otherwise there
2671 are problems when Exim is run under Cygwin (I'm told). See comments in
2672 spool_in.c, where the same locking is done. */
2674 data_file = fdopen(data_fd, "w+");
2675 lock_data.l_type = F_WRLCK;
2676 lock_data.l_whence = SEEK_SET;
2677 lock_data.l_start = 0;
2678 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2680 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2681 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2682 errno, strerror(errno));
2684 /* We have an open, locked data file. Write the message id to it to make it
2685 self-identifying. Then read the remainder of the input of this message and
2686 write it to the data file. If the variable next != NULL, it contains the first
2687 data line (which was read as a header but then turned out not to have the right
2688 format); write it (remembering that it might contain binary zeros). The result
2689 of fwrite() isn't inspected; instead we call ferror() below. */
2691 fprintf(data_file, "%s-D\n", message_id);
2694 uschar *s = next->text;
2695 int len = next->slen;
2696 (void)fwrite(s, 1, len, data_file);
2697 body_linecount++; /* Assumes only 1 line */
2700 /* Note that we might already be at end of file, or the logical end of file
2701 (indicated by '.'), or might have encountered an error while writing the
2702 message id or "next" line. */
2704 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2708 message_ended = read_message_data_smtp(data_file);
2709 receive_linecount++; /* The terminating "." line */
2711 else message_ended = read_message_data(data_file);
2713 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2714 message_linecount += body_linecount;
2716 /* Handle premature termination of SMTP */
2718 if (smtp_input && message_ended == END_EOF)
2720 Uunlink(spool_name); /* Lose data file when closed */
2721 message_id[0] = 0; /* Indicate no message accepted */
2722 smtp_reply = handle_lost_connection(US"");
2724 goto TIDYUP; /* Skip to end of function */
2727 /* Handle message that is too big. Don't use host_or_ident() in the log
2728 message; we want to see the ident value even for non-remote messages. */
2730 if (message_ended == END_SIZE)
2732 Uunlink(spool_name); /* Lose the data file when closed */
2733 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2735 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2736 "message too big: read=%d max=%d",
2738 (sender_fullhost == NULL)? "" : " H=",
2739 (sender_fullhost == NULL)? US"" : sender_fullhost,
2740 (sender_ident == NULL)? "" : " U=",
2741 (sender_ident == NULL)? US"" : sender_ident,
2743 thismessage_size_limit);
2747 smtp_reply = US"552 Message size exceeds maximum permitted";
2748 message_id[0] = 0; /* Indicate no message accepted */
2749 goto TIDYUP; /* Skip to end of function */
2753 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2754 give_local_error(ERRMESS_TOOBIG,
2755 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2756 US"message rejected: ", error_rc, data_file, header_list);
2757 /* Does not return */
2762 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2763 example, there may be some expansion in an ACL that uses a timer.) */
2765 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2767 /* The message body has now been read into the data file. Call fflush() to
2768 empty the buffers in C, and then call fsync() to get the data written out onto
2769 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2770 having to do this). If there was an I/O error on either input or output,
2771 attempt to send an error message, and unlink the spool file. For non-SMTP input
2772 we can then give up. Note that for SMTP input we must swallow the remainder of
2773 the input in cases of output errors, since the far end doesn't expect to see
2774 anything until the terminating dot line is sent. */
2776 if (fflush(data_file) == EOF || ferror(data_file) ||
2777 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2779 uschar *msg_errno = US strerror(errno);
2780 BOOL input_error = (receive_ferror)() != 0;
2781 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2782 input_error? "Input read" : "Spool write",
2784 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2786 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2787 Uunlink(spool_name); /* Lose the data file */
2792 smtp_reply = US"451 Error while reading input data";
2795 smtp_reply = US"451 Error while writing spool file";
2796 receive_swallow_smtp();
2798 message_id[0] = 0; /* Indicate no message accepted */
2799 goto TIDYUP; /* Skip to end of function */
2804 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2805 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2807 /* Does not return */
2812 /* No I/O errors were encountered while writing the data file. */
2814 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2817 /* If there were any bad addresses extracted by -t, or there were no recipients
2818 left after -t, send a message to the sender of this message, or write it to
2819 stderr if the error handling option is set that way. Note that there may
2820 legitimately be no recipients for an SMTP message if they have all been removed
2823 We need to rewind the data file in order to read it. In the case of no
2824 recipients or stderr error writing, throw the data file away afterwards, and
2825 exit. (This can't be SMTP, which always ensures there's at least one
2826 syntactically good recipient address.) */
2828 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2832 if (recipients_count == 0) debug_printf("*** No recipients\n");
2833 if (bad_addresses != NULL)
2835 error_block *eblock = bad_addresses;
2836 debug_printf("*** Bad address(es)\n");
2837 while (eblock != NULL)
2839 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2840 eblock = eblock->next;
2845 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2847 /* If configured to send errors to the sender, but this fails, force
2848 a failure error code. We use a special one for no recipients so that it
2849 can be detected by the autoreply transport. Otherwise error_rc is set to
2850 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2851 it is EXIT_SUCCESS. */
2853 if (error_handling == ERRORS_SENDER)
2855 if (!moan_to_sender(
2856 (bad_addresses == NULL)?
2857 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2858 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2859 bad_addresses, header_list, data_file, FALSE))
2860 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2864 if (bad_addresses == NULL)
2866 if (extracted_ignored)
2867 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2869 fprintf(stderr, "exim: no recipients in message\n");
2873 fprintf(stderr, "exim: invalid address%s",
2874 (bad_addresses->next == NULL)? ":" : "es:\n");
2875 while (bad_addresses != NULL)
2877 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2878 bad_addresses->text2);
2879 bad_addresses = bad_addresses->next;
2884 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2886 Uunlink(spool_name);
2887 (void)fclose(data_file);
2888 exim_exit(error_rc);
2892 /* Data file successfully written. Generate text for the Received: header by
2893 expanding the configured string, and adding a timestamp. By leaving this
2894 operation till now, we ensure that the timestamp is the time that message
2895 reception was completed. However, this is deliberately done before calling the
2896 data ACL and local_scan().
2898 This Received: header may therefore be inspected by the data ACL and by code in
2899 the local_scan() function. When they have run, we update the timestamp to be
2900 the final time of reception.
2902 If there is just one recipient, set up its value in the $received_for variable
2903 for use when we generate the Received: header.
2905 Note: the checking for too many Received: headers is handled by the delivery
2908 timestamp = expand_string(US"${tod_full}");
2909 if (recipients_count == 1) received_for = recipients_list[0].address;
2910 received = expand_string(received_header_text);
2911 received_for = NULL;
2913 if (received == NULL)
2915 Uunlink(spool_name); /* Lose the data file */
2916 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2917 "(received_header_text) failed: %s", string_printing(received_header_text),
2918 expand_string_message);
2921 /* The first element on the header chain is reserved for the Received header,
2922 so all we have to do is fill in the text pointer, and set the type. However, if
2923 the result of the expansion is an empty string, we leave the header marked as
2924 "old" so as to refrain from adding a Received header. */
2926 if (received[0] == 0)
2928 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2929 received_header->type = htype_old;
2933 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2934 received_header->type = htype_received;
2937 received_header->slen = Ustrlen(received_header->text);
2939 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2940 received_header->type, received_header->text);
2942 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2944 message_body_size = (fstat(data_fd, &statbuf) == 0)?
2945 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2947 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2948 now, before running the DATA ACL. */
2950 add_acl_headers(US"MAIL or RCPT");
2952 /* If an ACL is specified for checking things at this stage of reception of a
2953 message, run it, unless all the recipients were removed by "discard" in earlier
2954 ACLs. That is the only case in which recipients_count can be zero at this
2955 stage. Set deliver_datafile to point to the data file so that $message_body and
2956 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2959 deliver_datafile = data_fd;
2962 enable_dollar_recipients = TRUE;
2964 if (recipients_count == 0)
2966 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2970 /* Handle interactive SMTP messages */
2972 if (smtp_input && !smtp_batched_input)
2975 #ifdef EXPERIMENTAL_DOMAINKEYS
2976 dk_exim_verify_finish();
2979 #ifdef WITH_CONTENT_SCAN
2980 if (acl_smtp_mime != NULL &&
2981 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
2983 #endif /* WITH_CONTENT_SCAN */
2985 /* Check the recipients count again, as the MIME ACL might have changed
2988 if (acl_smtp_data != NULL && recipients_count > 0)
2990 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
2991 add_acl_headers(US"DATA");
2994 recipients_count = 0;
2995 blackholed_by = US"DATA ACL";
2996 if (log_msg != NULL)
2997 blackhole_log_msg = string_sprintf(": %s", log_msg);
3001 Uunlink(spool_name);
3002 #ifdef WITH_CONTENT_SCAN
3005 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3006 smtp_yield = FALSE; /* No more messsages after dropped connection */
3007 smtp_reply = US""; /* Indicate reply already sent */
3008 message_id[0] = 0; /* Indicate no message accepted */
3009 goto TIDYUP; /* Skip to end of function */
3014 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3015 we cannot take different actions for permanent and temporary rejections. */
3020 #ifdef WITH_CONTENT_SCAN
3021 if (acl_not_smtp_mime != NULL &&
3022 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3025 #endif /* WITH_CONTENT_SCAN */
3027 if (acl_not_smtp != NULL)
3029 uschar *user_msg, *log_msg;
3030 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3033 recipients_count = 0;
3034 blackholed_by = US"non-SMTP ACL";
3035 if (log_msg != NULL)
3036 blackhole_log_msg = string_sprintf(": %s", log_msg);
3040 Uunlink(spool_name);
3041 #ifdef WITH_CONTENT_SCAN
3044 /* The ACL can specify where rejections are to be logged, possibly
3045 nowhere. The default is main and reject logs. */
3047 if (log_reject_target != 0)
3048 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3049 sender_address, log_msg);
3051 if (user_msg == NULL) user_msg = US"local configuration problem";
3052 if (smtp_batched_input)
3054 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3055 /* Does not return */
3059 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3060 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3061 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3063 /* Does not return */
3066 add_acl_headers(US"non-SMTP");
3070 /* The applicable ACLs have been run */
3072 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3073 if (queue_only_policy) queued_by = US"ACL";
3076 #ifdef WITH_CONTENT_SCAN
3080 /* The final check on the message is to run the scan_local() function. The
3081 version supplied with Exim always accepts, but this is a hook for sysadmins to
3082 supply their own checking code. The local_scan() function is run even when all
3083 the recipients have been discarded. */
3085 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3087 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3088 deleted, and the incident gets logged. */
3090 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3091 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3092 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3093 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3095 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3096 local_scan_timeout);
3097 local_scan_data = NULL;
3099 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3100 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3101 rc = local_scan(data_fd, &local_scan_data);
3103 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3105 enable_dollar_recipients = FALSE;
3107 store_pool = POOL_MAIN; /* In case changed */
3108 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3111 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3112 os_non_restarting_signal(SIGFPE, SIG_DFL);
3113 os_non_restarting_signal(SIGILL, SIG_DFL);
3114 os_non_restarting_signal(SIGBUS, SIG_DFL);
3116 /* The length check is paranoia against some runaway code, and also because
3117 (for a success return) lines in the spool file are read into big_buffer. */
3119 if (local_scan_data != NULL)
3121 int len = Ustrlen(local_scan_data);
3122 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3123 local_scan_data = string_copyn(local_scan_data, len);
3126 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3128 if (!deliver_freeze) /* ACL might have already frozen */
3130 deliver_freeze = TRUE;
3131 deliver_frozen_at = time(NULL);
3132 frozen_by = US"local_scan()";
3134 rc = LOCAL_SCAN_ACCEPT;
3136 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3138 if (!queue_only_policy) /* ACL might have already queued */
3140 queue_only_policy = TRUE;
3141 queued_by = US"local_scan()";
3143 rc = LOCAL_SCAN_ACCEPT;
3146 /* Message accepted: remove newlines in local_scan_data because otherwise
3147 the spool file gets corrupted. Ensure that all recipients are qualified. */
3149 if (rc == LOCAL_SCAN_ACCEPT)
3151 if (local_scan_data != NULL)
3154 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3156 for (i = 0; i < recipients_count; i++)
3158 recipient_item *r = recipients_list + i;
3159 r->address = rewrite_address_qualify(r->address, TRUE);
3160 if (r->errors_to != NULL)
3161 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3163 if (recipients_count == 0 && blackholed_by == NULL)
3164 blackholed_by = US"local_scan";
3167 /* Message rejected: newlines permitted in local_scan_data to generate
3168 multiline SMTP responses. */
3172 uschar *istemp = US"";
3178 errmsg = local_scan_data;
3180 Uunlink(spool_name); /* Cancel this message */
3184 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3185 "rejection given", rc);
3188 case LOCAL_SCAN_REJECT_NOLOGHDR:
3189 log_extra_selector &= ~LX_rejected_header;
3192 case LOCAL_SCAN_REJECT:
3193 smtp_code = US"550";
3194 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3197 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3198 log_extra_selector &= ~LX_rejected_header;
3201 case LOCAL_SCAN_TEMPREJECT:
3203 smtp_code = US"451";
3204 if (errmsg == NULL) errmsg = US"Temporary local problem";
3205 istemp = US"temporarily ";
3209 s = string_append(s, &size, &sptr, 2, US"F=",
3210 (sender_address[0] == 0)? US"<>" : sender_address);
3211 s = add_host_info_for_log(s, &size, &sptr);
3214 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3215 s, istemp, string_printing(errmsg));
3219 if (!smtp_batched_input)
3221 smtp_respond(smtp_code, 3, TRUE, errmsg);
3222 message_id[0] = 0; /* Indicate no message accepted */
3223 smtp_reply = US""; /* Indicate reply already sent */
3224 goto TIDYUP; /* Skip to end of function */
3228 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3229 /* Does not return */
3234 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3235 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3236 US"message rejected by local scan code: ", error_rc, data_file,
3238 /* Does not return */
3242 /* Reset signal handlers to ignore signals that previously would have caused
3243 the message to be abandoned. */
3245 signal(SIGTERM, SIG_IGN);
3246 signal(SIGINT, SIG_IGN);
3248 /* Ensure the first time flag is set in the newly-received message. */
3250 deliver_firsttime = TRUE;
3252 #ifdef EXPERIMENTAL_BRIGHTMAIL
3254 /* rewind data file */
3255 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3256 bmi_verdicts = bmi_process_message(header_list, data_fd);
3260 /* Update the timstamp in our Received: header to account for any time taken by
3261 an ACL or by local_scan(). The new time is the time that all reception
3262 processing is complete. */
3264 timestamp = expand_string(US"${tod_full}");
3265 tslen = Ustrlen(timestamp);
3267 memcpy(received_header->text + received_header->slen - tslen - 1,
3270 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3274 deliver_freeze = FALSE;
3275 queue_only_policy = FALSE;
3278 /* Keep the data file open until we have written the header file, in order to
3279 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3280 don't write the header file, and we unlink the data file. If writing the header
3281 file fails, we have failed to accept this message. */
3283 if (host_checking || blackholed_by != NULL)
3286 Uunlink(spool_name);
3287 msg_size = 0; /* Compute size for log line */
3288 for (h = header_list; h != NULL; h = h->next)
3289 if (h->type != '*') msg_size += h->slen;
3292 /* Write the -H file */
3296 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3298 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3299 Uunlink(spool_name); /* Lose the data file */
3303 smtp_reply = US"451 Error in writing spool file";
3304 message_id[0] = 0; /* Indicate no message accepted */
3309 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3310 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3312 /* Does not return */
3318 /* The message has now been successfully received. */
3320 receive_messagecount++;
3322 /* In SMTP sessions we may receive several in one connection. After each one,
3323 we wait for the clock to tick at the level of message-id granularity. This is
3324 so that the combination of time+pid is unique, even on systems where the pid
3325 can be re-used within our time interval. We can't shorten the interval without
3326 re-designing the message-id. See comments above where the message id is
3327 created. This is Something For The Future. */
3329 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3330 exim_wait_tick(&message_id_tv, id_resolution);
3332 /* Add data size to written header size. We do not count the initial file name
3333 that is in the file, but we do add one extra for the notional blank line that
3334 precedes the data. This total differs from message_size in that it include the
3335 added Received: header and any other headers that got created locally. */
3338 fstat(data_fd, &statbuf);
3340 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3342 /* Generate a "message received" log entry. We do this by building up a dynamic
3343 string as required. Since we commonly want to add two items at a time, use a
3344 macro to simplify the coding. We log the arrival of a new message while the
3345 file is still locked, just in case the machine is *really* fast, and delivers
3346 it first! Include any message id that is in the message - since the syntax of a
3347 message id is actually an addr-spec, we can use the parse routine to canonicize
3352 s = store_get(size);
3354 s = string_append(s, &size, &sptr, 2, US"<= ",
3355 (sender_address[0] == 0)? US"<>" : sender_address);
3356 if (message_reference != NULL)
3357 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3359 s = add_host_info_for_log(s, &size, &sptr);
3362 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3363 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3364 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3366 s = string_append(s, &size, &sptr, 2, US" CV=",
3367 tls_certificate_verified? "yes":"no");
3368 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3369 s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\"");
3372 if (sender_host_authenticated != NULL)
3374 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3375 if (authenticated_id != NULL)
3376 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3379 sprintf(CS big_buffer, "%d", msg_size);
3380 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3382 /* If an addr-spec in a message-id contains a quoted string, it can contain
3383 any characters except " \ and CR and so in particular it can contain NL!
3384 Therefore, make sure we use a printing-characters only version for the log.
3385 Also, allow for domain literals in the message id. */
3387 if (msgid_header != NULL)
3390 BOOL save_allow_domain_literals = allow_domain_literals;
3391 allow_domain_literals = TRUE;
3392 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3393 &errmsg, &start, &end, &domain, FALSE);
3394 allow_domain_literals = save_allow_domain_literals;
3396 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3399 /* If subject logging is turned on, create suitable printing-character
3400 text. By expanding $h_subject: we make use of the MIME decoding. */
3402 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3405 uschar *p = big_buffer;
3406 uschar *ss = expand_string(US"$h_subject:");
3408 /* Backslash-quote any double quotes or backslashes so as to make a
3409 a C-like string, and turn any non-printers into escape sequences. */
3412 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3414 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3419 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3422 /* Terminate the string: string_cat() and string_append() leave room, but do
3423 not put the zero in. */
3427 /* Create a message log file if message logs are being used and this message is
3428 not blackholed. Write the reception stuff to it. We used to leave message log
3429 creation until the first delivery, but this has proved confusing for somep
3432 if (message_logs && blackholed_by == NULL)
3436 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3438 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3440 if (fd < 0 && errno == ENOENT)
3443 sprintf(CS temp, "msglog/%s", message_subdir);
3444 if (message_subdir[0] == 0) temp[6] = 0;
3445 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3446 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3451 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3452 spool_name, strerror(errno));
3457 FILE *message_log = fdopen(fd, "a");
3458 if (message_log == NULL)
3460 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3461 spool_name, strerror(errno));
3466 uschar *now = tod_stamp(tod_log);
3467 fprintf(message_log, "%s Received from %s\n", now, s+3);
3468 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3470 if (queue_only_policy) fprintf(message_log,
3471 "%s no immediate delivery: queued by %s\n", now, queued_by);
3472 (void)fclose(message_log);
3477 /* Everything has now been done for a successful message except logging its
3478 arrival, and outputting an SMTP response. While writing to the log, set a flag
3479 to cause a call to receive_bomb_out() if the log cannot be opened. */
3481 receive_call_bombout = TRUE;
3483 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3484 connection has gone away. This can only be done if there is no unconsumed input
3485 waiting in the local input buffer. We can test for this by calling
3486 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3487 input to be sent following the final dot, so the presence of following input is
3490 If the connection is still present, but there is no unread input for the
3491 socket, the result of a select() call will be zero. If, however, the connection
3492 has gone away, or if there is pending input, the result of select() will be
3493 non-zero. The two cases can be distinguished by trying to read the next input
3494 character. If we succeed, we can unread it so that it remains in the local
3495 buffer for handling later. If not, the connection has been lost.
3497 Of course, since TCP/IP is asynchronous, there is always a chance that the
3498 connection will vanish between the time of this test and the sending of the
3499 response, but the chance of this happening should be small. */
3501 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3502 !receive_smtp_buffered())
3505 fd_set select_check;
3506 FD_ZERO(&select_check);
3507 FD_SET(fileno(smtp_in), &select_check);
3511 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3513 int c = (RECEIVE_GETC)();
3514 if (c != EOF) (RECEIVE_UNGETC)(c); else
3516 uschar *msg = US"SMTP connection lost after final dot";
3517 smtp_reply = US""; /* No attempt to send a response */
3518 smtp_yield = FALSE; /* Nothing more on this connection */
3520 /* Re-use the log line workspace */
3523 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3524 s = add_host_info_for_log(s, &size, &sptr);
3526 log_write(0, LOG_MAIN, "%s", s);
3528 /* Delete the files for this aborted message. */
3530 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3531 message_subdir, message_id);
3532 Uunlink(spool_name);
3534 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3535 message_subdir, message_id);
3536 Uunlink(spool_name);
3538 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3539 message_subdir, message_id);
3540 Uunlink(spool_name);
3547 /* The connection has not gone away; we really are going to take responsibility
3548 for this message. */
3550 log_write(0, LOG_MAIN |
3551 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3552 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3554 receive_call_bombout = FALSE;
3556 /* Log any control actions taken by an ACL or local_scan(). */
3558 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3559 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3560 "no immediate delivery: queued by %s", queued_by);
3562 store_reset(s); /* The store for the main log message can be reused */
3564 /* If the message is frozen, and freeze_tell is set, do the telling. */
3566 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3568 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3569 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3570 message_id, frozen_by, sender_address);
3574 /* Either a message has been successfully received and written to the two spool
3575 files, or an error in writing the spool has occurred for an SMTP message, or
3576 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
3577 we will have already given up because there's no point in carrying on!) In
3578 either event, we must now close (and thereby unlock) the data file. In the
3579 successful case, this leaves the message on the spool, ready for delivery. In
3580 the error case, the spool file will be deleted. Then tidy up store, interact
3581 with an SMTP call if necessary, and return.
3583 A fflush() was done earlier in the expectation that any write errors on the
3584 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3585 possible for fclose() to fail - but what to do? What has happened to the lock
3589 process_info[process_info_len] = 0; /* Remove message id */
3590 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
3592 /* Now reset signal handlers to their defaults */
3594 signal(SIGTERM, SIG_DFL);
3595 signal(SIGINT, SIG_DFL);
3597 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3598 value, which defaults TRUE - meaning there may be more incoming messages from
3599 this connection. For non-SMTP callers (where there is only ever one message),
3600 the default is FALSE. */
3606 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3607 is set to the response that should be sent. When it is NULL, we generate
3608 default responses. After an ACL error or local_scan() error, the response has
3609 already been sent, and smtp_reply is an empty string to indicate this. */
3611 if (!smtp_batched_input)
3613 if (smtp_reply == NULL)
3615 if (fake_response != OK)
3616 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
3617 fake_response_text);
3619 /* An OK response is required; use "message" text if present. */
3621 else if (user_msg != NULL)
3623 uschar *code = US"250";
3625 smtp_message_code(&code, &len, &user_msg, NULL);
3626 smtp_respond(code, len, TRUE, user_msg);
3629 /* Default OK response */
3632 smtp_printf("250 OK id=%s\r\n", message_id);
3635 "\n**** SMTP testing: that is not a real message id!\n\n");
3638 /* smtp_reply is set non-empty */
3640 else if (smtp_reply[0] != 0)
3642 if (fake_response != OK && (smtp_reply[0] == '2'))
3643 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
3644 fake_response_text);
3646 smtp_printf("%.1024s\r\n", smtp_reply);
3650 /* For batched SMTP, generate an error message on failure, and do
3651 nothing on success. The function moan_smtp_batch() does not return -
3652 it exits from the program with a non-zero return code. */
3654 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
3658 /* If blackholing, we can immediately log this message's sad fate. The data
3659 file has already been unlinked, and the header file was never written to disk.
3660 We must now indicate that nothing was received, to prevent a delivery from
3663 if (blackholed_by != NULL)
3665 uschar *detail = (local_scan_data != NULL)?
3666 string_printing(local_scan_data) :
3667 string_sprintf("(%s discarded recipients)", blackholed_by);
3668 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
3669 log_write(0, LOG_MAIN, "Completed");
3673 /* Reset headers so that logging of rejects for a subsequent message doesn't
3674 include them. It is also important to set header_last = NULL before exiting
3675 from this function, as this prevents certain rewrites that might happen during
3676 subsequent verifying (of another incoming message) from trying to add headers
3677 when they shouldn't. */
3679 header_list = header_last = NULL;
3681 return yield; /* TRUE if more messages (SMTP only) */
3684 /* End of receive.c */