1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
12 #ifdef EXPERIMENTAL_DCC
16 /*************************************************
17 * Local static variables *
18 *************************************************/
20 static FILE *data_file = NULL;
21 static int data_fd = -1;
22 static uschar spool_name[256];
26 /*************************************************
27 * Non-SMTP character reading functions *
28 *************************************************/
30 /* These are the default functions that are set up in the variables such as
31 receive_getc initially. They just call the standard functions, passing stdin as
32 the file. (When SMTP input is occurring, different functions are used by
33 changing the pointer variables.) */
44 return ungetc(c, stdin);
62 /*************************************************
63 * Check that a set sender is allowed *
64 *************************************************/
66 /* This function is called when a local caller sets an explicit sender address.
67 It checks whether this is permitted, which it is for trusted callers.
68 Otherwise, it must match the pattern(s) in untrusted_set_sender.
70 Arguments: the proposed sender address
71 Returns: TRUE for a trusted caller
72 TRUE if the address has been set, untrusted_set_sender has been
73 set, and the address matches something in the list
78 receive_check_set_sender(uschar *newsender)
81 if (trusted_caller) return TRUE;
82 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
83 qnewsender = (Ustrchr(newsender, '@') != NULL)?
84 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
86 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
93 /*************************************************
94 * Read space info for a partition *
95 *************************************************/
97 /* This function is called by receive_check_fs() below, and also by string
98 expansion for variables such as $spool_space. The field names for the statvfs
99 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
100 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
101 have inodes, and they return -1 for the number available.
103 Later: It turns out that some file systems that do not have the concept of
104 inodes return 0 rather than -1. Such systems should also return 0 for the total
105 number of inodes, so we require that to be greater than zero before returning
109 isspool TRUE for spool partition, FALSE for log partition
110 inodeptr address of int to receive inode count; -1 if there isn't one
112 Returns: available on-root space, in kilobytes
113 -1 for log partition if there isn't one
115 All values are -1 if the STATFS functions are not available.
119 receive_statvfs(BOOL isspool, int *inodeptr)
122 struct STATVFS statbuf;
127 /* The spool directory must always exist. */
131 path = spool_directory;
135 /* Need to cut down the log file path to the directory, and to ignore any
136 appearance of "syslog" in it. */
140 int sep = ':'; /* Not variable - outside scripts use */
141 uschar *p = log_file_path;
144 /* An empty log_file_path means "use the default". This is the same as an
145 empty item in a list. */
147 if (*p == 0) p = US":";
148 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
150 if (Ustrcmp(path, "syslog") != 0) break;
153 if (path == NULL) /* No log files */
159 /* An empty string means use the default, which is in the spool directory.
160 But don't just use the spool directory, as it is possible that the log
161 subdirectory has been symbolically linked elsewhere. */
165 sprintf(CS buffer, CS"%s/log", CS spool_directory);
171 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
175 /* We now have the path; do the business */
177 memset(&statbuf, 0, sizeof(statbuf));
179 if (STATVFS(CS path, &statbuf) != 0)
181 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
182 "%s directory %s: %s", name, spool_directory, strerror(errno));
183 smtp_closedown(US"spool or log directory problem");
184 exim_exit(EXIT_FAILURE);
187 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
189 /* Disks are getting huge. Take care with computing the size in kilobytes. */
191 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
193 /* Unable to find partition sizes in this environment. */
204 /*************************************************
205 * Check space on spool and log partitions *
206 *************************************************/
208 /* This function is called before accepting a message; if any thresholds are
209 set, it checks them. If a message_size is supplied, it checks that there is
210 enough space for that size plus the threshold - i.e. that the message won't
211 reduce the space to the threshold. Not all OS have statvfs(); for those that
212 don't, this function always returns TRUE. For some OS the old function and
213 struct name statfs is used; that is handled by a macro, defined in exim.h.
216 msg_size the (estimated) size of an incoming message
218 Returns: FALSE if there isn't enough space, or if the information cannot
220 TRUE if no check was done or there is enough space
224 receive_check_fs(int msg_size)
228 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
230 space = receive_statvfs(TRUE, &inodes);
233 debug_printf("spool directory space = %dK inodes = %d "
234 "check_space = %dK inodes = %d msg_size = %d\n",
235 space, inodes, check_spool_space, check_spool_inodes, msg_size);
237 if ((space >= 0 && space < check_spool_space) ||
238 (inodes >= 0 && inodes < check_spool_inodes))
240 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
241 "inodes=%d", space, inodes);
246 if (check_log_space > 0 || check_log_inodes > 0)
248 space = receive_statvfs(FALSE, &inodes);
251 debug_printf("log directory space = %dK inodes = %d "
252 "check_space = %dK inodes = %d\n",
253 space, inodes, check_log_space, check_log_inodes);
255 if ((space >= 0 && space < check_log_space) ||
256 (inodes >= 0 && inodes < check_log_inodes))
258 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
259 "inodes=%d", space, inodes);
269 /*************************************************
270 * Bomb out while reading a message *
271 *************************************************/
273 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
274 received, or if there is a timeout. A rarer case might be if the log files are
275 screwed up and Exim can't open them to record a message's arrival. Handling
276 that case is done by setting a flag to cause the log functions to call this
277 function if there is an ultimate disaster. That is why it is globally
281 reason text reason to pass to the not-quit ACL
282 msg default SMTP response to give if in an SMTP session
287 receive_bomb_out(uschar *reason, uschar *msg)
289 /* If spool_name is set, it contains the name of the data file that is being
290 written. Unlink it before closing so that it cannot be picked up by a delivery
291 process. Ensure that any header file is also removed. */
293 if (spool_name[0] != 0)
296 spool_name[Ustrlen(spool_name) - 1] = 'H';
300 /* Now close the file if it is open, either as a fd or a stream. */
302 if (data_file != NULL) (void)fclose(data_file);
303 else if (data_fd >= 0) (void)close(data_fd);
305 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
306 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
311 if (smtp_batched_input)
312 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
313 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
314 smtp_active_hostname, msg);
317 /* Exit from the program (non-BSMTP cases) */
319 exim_exit(EXIT_FAILURE);
323 /*************************************************
324 * Data read timeout *
325 *************************************************/
327 /* Handler function for timeouts that occur while reading the data that
330 Argument: the signal number
335 data_timeout_handler(int sig)
339 sig = sig; /* Keep picky compilers happy */
343 msg = US"SMTP incoming data timeout";
344 log_write(L_lost_incoming_connection,
345 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
347 (sender_fullhost != NULL)? sender_fullhost : US"local process",
352 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
353 log_write(L_lost_incoming_connection,
354 LOG_MAIN, "timed out while reading local message");
357 receive_bomb_out(US"data-timeout", msg); /* Does not return */
362 /*************************************************
363 * local_scan() timeout *
364 *************************************************/
366 /* Handler function for timeouts that occur while running a local_scan()
369 Argument: the signal number
374 local_scan_timeout_handler(int sig)
376 sig = sig; /* Keep picky compilers happy */
377 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
378 "message temporarily rejected (size %d)", message_size);
379 /* Does not return */
380 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
385 /*************************************************
386 * local_scan() crashed *
387 *************************************************/
389 /* Handler function for signals that occur while running a local_scan()
392 Argument: the signal number
397 local_scan_crash_handler(int sig)
399 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
400 "signal %d - message temporarily rejected (size %d)", sig, message_size);
401 /* Does not return */
402 receive_bomb_out(US"local-scan-error", US"local verification problem");
406 /*************************************************
407 * SIGTERM or SIGINT received *
408 *************************************************/
410 /* Handler for SIGTERM or SIGINT signals that occur while reading the
411 data that comprises a message.
413 Argument: the signal number
418 data_sigterm_sigint_handler(int sig)
424 msg = US"Service not available - SIGTERM or SIGINT received";
425 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
426 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
430 if (filter_test == FTEST_NONE)
432 fprintf(stderr, "\nexim: %s received - message abandoned\n",
433 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
434 log_write(0, LOG_MAIN, "%s received while reading local message",
435 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
439 receive_bomb_out(US"signal-exit", msg); /* Does not return */
444 /*************************************************
445 * Add new recipient to list *
446 *************************************************/
448 /* This function builds a list of recipient addresses in argc/argv
452 recipient the next address to add to recipients_list
453 pno parent number for fixed aliases; -1 otherwise
459 receive_add_recipient(uschar *recipient, int pno)
461 if (recipients_count >= recipients_list_max)
463 recipient_item *oldlist = recipients_list;
464 int oldmax = recipients_list_max;
465 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
466 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
468 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
471 recipients_list[recipients_count].address = recipient;
472 recipients_list[recipients_count].pno = pno;
473 #ifdef EXPERIMENTAL_BRIGHTMAIL
474 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
475 /* reset optin string pointer for next recipient */
476 bmi_current_optin = NULL;
478 recipients_list[recipients_count++].errors_to = NULL;
484 /*************************************************
485 * Send user response message *
486 *************************************************/
488 /* This function is passed a default response code and a user message. It calls
489 smtp_message_code() to check and possibly modify the response code, and then
490 calls smtp_respond() to transmit the response. I put this into a function
491 just to avoid a lot of repetition.
494 code the response code
495 user_msg the user message
501 smtp_user_msg(uschar *code, uschar *user_msg)
504 smtp_message_code(&code, &len, &user_msg, NULL);
505 smtp_respond(code, len, TRUE, user_msg);
512 /*************************************************
513 * Remove a recipient from the list *
514 *************************************************/
516 /* This function is provided for local_scan() to use.
519 recipient address to remove
521 Returns: TRUE if it did remove something; FALSE otherwise
525 receive_remove_recipient(uschar *recipient)
528 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
530 for (count = 0; count < recipients_count; count++)
532 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
534 if ((--recipients_count - count) > 0)
535 memmove(recipients_list + count, recipients_list + count + 1,
536 (recipients_count - count)*sizeof(recipient_item));
547 /*************************************************
548 * Read data portion of a non-SMTP message *
549 *************************************************/
551 /* This function is called to read the remainder of a message (following the
552 header) when the input is not from SMTP - we are receiving a local message on
553 a standard input stream. The message is always terminated by EOF, and is also
554 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
555 two cases for maximum efficiency.
557 Ensure that the body ends with a newline. This will naturally be the case when
558 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
559 as "sequences of lines" - this of course strictly applies only to SMTP, but
560 deliveries into BSD-type mailbox files also require it. Exim used to have a
561 flag for doing this at delivery time, but as it was always set for all
562 transports, I decided to simplify things by putting the check here instead.
564 There is at least one MUA (dtmail) that sends CRLF via this interface, and
565 other programs are known to do this as well. Exim used to have a option for
566 dealing with this: in July 2003, after much discussion, the code has been
567 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
569 However, for the case when a dot on a line by itself terminates a message, the
570 only recognized terminating sequences before and after the dot are LF and CRLF.
571 Otherwise, having read EOL . CR, you don't know whether to read another
574 Internally, in messages stored in Exim's spool files, LF is used as the line
575 terminator. Under the new regime, bare CRs will no longer appear in these
579 fout a FILE to which to write the message
581 Returns: One of the END_xxx values indicating why it stopped reading
585 read_message_data(FILE *fout)
589 register int linelength = 0;
591 /* Handle the case when only EOF terminates the message */
595 register int last_ch = '\n';
597 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
599 if (ch == 0) body_zerocount++;
600 if (last_ch == '\r' && ch != '\n')
602 if (linelength > max_received_linelength)
603 max_received_linelength = linelength;
605 if (fputc('\n', fout) == EOF) return END_WERROR;
609 if (ch == '\r') continue;
611 if (fputc(ch, fout) == EOF) return END_WERROR;
614 if (linelength > max_received_linelength)
615 max_received_linelength = linelength;
620 if (++message_size > thismessage_size_limit) return END_SIZE;
625 if (linelength > max_received_linelength)
626 max_received_linelength = linelength;
627 if (fputc('\n', fout) == EOF) return END_WERROR;
635 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
639 while ((ch = (receive_getc)()) != EOF)
641 if (ch == 0) body_zerocount++;
644 case 0: /* Normal state (previous char written) */
648 if (linelength > max_received_linelength)
649 max_received_linelength = linelength;
654 { ch_state = 2; continue; }
657 case 1: /* After written "\n" */
658 if (ch == '.') { ch_state = 3; continue; }
659 if (ch != '\n') ch_state = 0; else linelength = -1;
663 body_linecount++; /* After unwritten "\r" */
664 if (linelength > max_received_linelength)
665 max_received_linelength = linelength;
673 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
674 if (ch == '\r') continue;
680 case 3: /* After "\n." (\n written, dot not) */
681 if (ch == '\n') return END_DOT;
682 if (ch == '\r') { ch_state = 4; continue; }
685 if (fputc('.', fout) == EOF) return END_WERROR;
689 case 4: /* After "\n.\r" (\n written, rest not) */
690 if (ch == '\n') return END_DOT;
693 if (fputs(".\n", fout) == EOF) return END_WERROR;
694 if (ch == '\r') { ch_state = 2; continue; }
700 if (fputc(ch, fout) == EOF) return END_WERROR;
701 if (++message_size > thismessage_size_limit) return END_SIZE;
704 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
705 the message ends with a newline, and we must also write any characters that
706 were saved up while testing for an ending dot. */
710 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
711 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
712 message_size += Ustrlen(ends[ch_state]);
722 /*************************************************
723 * Read data portion of an SMTP message *
724 *************************************************/
726 /* This function is called to read the remainder of an SMTP message (after the
727 headers), or to skip over it when an error has occurred. In this case, the
728 output file is passed as NULL.
730 If any line begins with a dot, that character is skipped. The input should only
731 be successfully terminated by CR LF . CR LF unless it is local (non-network)
732 SMTP, in which case the CRs are optional, but...
734 FUDGE: It seems that sites on the net send out messages with just LF
735 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
736 we make the CRs optional in all cases.
738 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
739 well, so that there are no CRs in spooled messages. However, the message
740 terminating dot is not recognized between two bare CRs.
743 fout a FILE to which to write the message; NULL if skipping
745 Returns: One of the END_xxx values indicating why it stopped reading
749 read_message_data_smtp(FILE *fout)
753 register int linelength = 0;
755 while ((ch = (receive_getc)()) != EOF)
757 if (ch == 0) body_zerocount++;
760 case 0: /* After LF or CRLF */
764 continue; /* Don't ever write . after LF */
768 /* Else fall through to handle as normal uschar. */
770 case 1: /* Normal state */
775 if (linelength > max_received_linelength)
776 max_received_linelength = linelength;
786 case 2: /* After (unwritten) CR */
788 if (linelength > max_received_linelength)
789 max_received_linelength = linelength;
798 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
799 (void) cutthrough_put_nl();
800 if (ch != '\r') ch_state = 1; else continue;
804 case 3: /* After [CR] LF . */
812 ch_state = 1; /* The dot itself is removed */
815 case 4: /* After [CR] LF . CR */
816 if (ch == '\n') return END_DOT;
819 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
820 (void) cutthrough_put_nl();
830 /* Add the character to the spool file, unless skipping; then loop for the
837 if (fputc(ch, fout) == EOF) return END_WERROR;
838 if (message_size > thismessage_size_limit) return END_SIZE;
841 (void) cutthrough_put_nl();
845 (void) cutthrough_puts(&c, 1);
849 /* Fall through here if EOF encountered. This indicates some kind of error,
850 since a correct message is terminated by [CR] LF . [CR] LF. */
858 /*************************************************
859 * Swallow SMTP message *
860 *************************************************/
862 /* This function is called when there has been some kind of error while reading
863 an SMTP message, and the remaining data may need to be swallowed. It is global
864 because it is called from smtp_closedown() to shut down an incoming call
867 Argument: a FILE from which to read the message
872 receive_swallow_smtp(void)
874 if (message_ended >= END_NOTENDED)
875 message_ended = read_message_data_smtp(NULL);
880 /*************************************************
881 * Handle lost SMTP connection *
882 *************************************************/
884 /* This function logs connection loss incidents and generates an appropriate
887 Argument: additional data for the message
888 Returns: the SMTP response
892 handle_lost_connection(uschar *s)
894 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
895 "%s lost while reading message data%s", smtp_get_connection_info(), s);
896 return US"421 Lost incoming connection";
902 /*************************************************
903 * Handle a non-smtp reception error *
904 *************************************************/
906 /* This function is called for various errors during the reception of non-SMTP
907 messages. It either sends a message to the sender of the problem message, or it
908 writes to the standard error stream.
911 errcode code for moan_to_sender(), identifying the error
912 text1 first message text, passed to moan_to_sender()
913 text2 second message text, used only for stderrr
914 error_rc code to pass to exim_exit if no problem
915 f FILE containing body of message (may be stdin)
916 hptr pointer to instore headers or NULL
918 Returns: calls exim_exit(), which does not return
922 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
923 FILE *f, header_line *hptr)
925 if (error_handling == ERRORS_SENDER)
929 eblock.text1 = text1;
930 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
931 error_rc = EXIT_FAILURE;
933 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
940 /*************************************************
941 * Add header lines set up by ACL *
942 *************************************************/
944 /* This function is called to add the header lines that were set up by
945 statements in an ACL to the list of headers in memory. It is done in two stages
946 like this, because when the ACL for RCPT is running, the other headers have not
947 yet been received. This function is called twice; once just before running the
948 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
949 are visible to the DATA ACL.
951 Originally these header lines were added at the end. Now there is support for
952 three different places: top, bottom, and after the Received: header(s). There
953 will always be at least one Received: header, even if it is marked deleted, and
954 even if something else has been put in front of it.
957 acl_name text to identify which ACL
963 add_acl_headers(uschar *acl_name)
965 header_line *h, *next;
966 header_line *last_received = NULL;
968 if (acl_removed_headers != NULL)
970 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
972 for (h = header_list; h != NULL; h = h->next)
977 if (h->type == htype_old) continue;
979 include_header = TRUE;
980 list = acl_removed_headers;
982 int sep = ':'; /* This is specified as a colon-separated list */
985 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer)))
988 int len = Ustrlen(s);
989 if (header_testname(h, s, len, FALSE))
992 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
996 acl_removed_headers = NULL;
997 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1000 if (acl_added_headers == NULL) return;
1001 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1003 for (h = acl_added_headers; h != NULL; h = next)
1010 h->next = header_list;
1012 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1016 if (last_received == NULL)
1018 last_received = header_list;
1019 while (!header_testname(last_received, US"Received", 8, FALSE))
1020 last_received = last_received->next;
1021 while (last_received->next != NULL &&
1022 header_testname(last_received->next, US"Received", 8, FALSE))
1023 last_received = last_received->next;
1025 h->next = last_received->next;
1026 last_received->next = h;
1027 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1031 /* add header before any header which is NOT Received: or Resent- */
1032 last_received = header_list;
1033 while ( (last_received->next != NULL) &&
1034 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1035 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1036 last_received = last_received->next;
1037 /* last_received now points to the last Received: or Resent-* header
1038 in an uninterrupted chain of those header types (seen from the beginning
1039 of all headers. Our current header must follow it. */
1040 h->next = last_received->next;
1041 last_received->next = h;
1042 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1047 header_last->next = h;
1051 if (h->next == NULL) header_last = h;
1053 /* Check for one of the known header types (From:, To:, etc.) though in
1054 practice most added headers are going to be "other". Lower case
1055 identification letters are never stored with the header; they are used
1056 for existence tests when messages are received. So discard any lower case
1059 h->type = header_checkname(h, FALSE);
1060 if (h->type >= 'a') h->type = htype_other;
1062 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1065 acl_added_headers = NULL;
1066 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1071 /*************************************************
1072 * Add host information for log line *
1073 *************************************************/
1075 /* Called for acceptance and rejecting log lines. This adds information about
1076 the calling host to a string that is being built dynamically.
1079 s the dynamic string
1080 sizeptr points to the size variable
1081 ptrptr points to the pointer variable
1083 Returns: the extended string
1087 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1089 if (sender_fullhost != NULL)
1091 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1092 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1093 interface_address != NULL)
1095 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1097 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1100 if (sender_ident != NULL)
1101 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1102 if (received_protocol != NULL)
1103 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1109 #ifdef WITH_CONTENT_SCAN
1111 /*************************************************
1112 * Run the MIME ACL on a message *
1113 *************************************************/
1115 /* This code is in a subroutine so that it can be used for both SMTP
1116 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1119 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1120 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1121 smtp_reply_ptr Where SMTP reply is being built
1122 blackholed_by_ptr Where "blackholed by" message is being built
1124 Returns: TRUE to carry on; FALSE to abandon the message
1128 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1129 uschar **blackholed_by_ptr)
1132 uschar rfc822_file_path[2048];
1133 unsigned long mbox_size;
1134 header_line *my_headerlist;
1135 uschar *user_msg, *log_msg;
1136 int mime_part_count_buffer = -1;
1139 memset(CS rfc822_file_path,0,2048);
1141 /* check if it is a MIME message */
1142 my_headerlist = header_list;
1143 while (my_headerlist != NULL)
1145 /* skip deleted headers */
1146 if (my_headerlist->type == '*')
1148 my_headerlist = my_headerlist->next;
1151 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1153 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1156 my_headerlist = my_headerlist->next;
1159 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1163 /* make sure the eml mbox file is spooled up */
1164 mbox_file = spool_mbox(&mbox_size, NULL);
1165 if (mbox_file == NULL) {
1166 /* error while spooling */
1167 log_write(0, LOG_MAIN|LOG_PANIC,
1168 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1169 Uunlink(spool_name);
1171 #ifdef EXPERIMENTAL_DCC
1174 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1175 message_id[0] = 0; /* Indicate no message accepted */
1176 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1177 return FALSE; /* Indicate skip to end of receive function */
1183 mime_part_count = -1;
1184 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1185 (void)fclose(mbox_file);
1187 if (Ustrlen(rfc822_file_path) > 0)
1189 mime_part_count = mime_part_count_buffer;
1191 if (unlink(CS rfc822_file_path) == -1)
1193 log_write(0, LOG_PANIC,
1194 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1199 /* check if we must check any message/rfc822 attachments */
1202 uschar temp_path[1024];
1204 struct dirent *entry;
1207 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1210 tempdir = opendir(CS temp_path);
1214 entry = readdir(tempdir);
1215 if (entry == NULL) break;
1216 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1218 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1219 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1227 mbox_file = Ufopen(rfc822_file_path,"rb");
1228 if (mbox_file == NULL)
1230 log_write(0, LOG_PANIC,
1231 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1232 unlink(CS rfc822_file_path);
1235 /* set RFC822 expansion variable */
1237 mime_part_count_buffer = mime_part_count;
1238 goto MIME_ACL_CHECK;
1243 add_acl_headers(US"MIME");
1246 recipients_count = 0;
1247 *blackholed_by_ptr = US"MIME ACL";
1251 Uunlink(spool_name);
1253 #ifdef EXPERIMENTAL_DCC
1256 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1257 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1258 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1259 message_id[0] = 0; /* Indicate no message accepted */
1260 return FALSE; /* Cause skip to end of receive function */
1266 #endif /* WITH_CONTENT_SCAN */
1271 received_header_gen(void)
1275 header_line *received_header= header_list;
1277 timestamp = expand_string(US"${tod_full}");
1278 if (recipients_count == 1) received_for = recipients_list[0].address;
1279 received = expand_string(received_header_text);
1280 received_for = NULL;
1282 if (received == NULL)
1284 if(spool_name[0] != 0)
1285 Uunlink(spool_name); /* Lose the data file */
1286 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1287 "(received_header_text) failed: %s", string_printing(received_header_text),
1288 expand_string_message);
1291 /* The first element on the header chain is reserved for the Received header,
1292 so all we have to do is fill in the text pointer, and set the type. However, if
1293 the result of the expansion is an empty string, we leave the header marked as
1294 "old" so as to refrain from adding a Received header. */
1296 if (received[0] == 0)
1298 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1299 received_header->type = htype_old;
1303 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1304 received_header->type = htype_received;
1307 received_header->slen = Ustrlen(received_header->text);
1309 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1310 received_header->type, received_header->text);
1315 /*************************************************
1317 *************************************************/
1319 /* Receive a message on the given input, and put it into a pair of spool files.
1320 Either a non-null list of recipients, or the extract flag will be true, or
1321 both. The flag sender_local is true for locally generated messages. The flag
1322 submission_mode is true if an ACL has obeyed "control = submission". The flag
1323 suppress_local_fixups is true if an ACL has obeyed "control =
1324 suppress_local_fixups" or -G was passed on the command-line.
1325 The flag smtp_input is true if the message is to be
1326 handled using SMTP conventions about termination and lines starting with dots.
1327 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1329 If a message was successfully read, message_id[0] will be non-zero.
1331 The general actions of this function are:
1333 . Read the headers of the message (if any) into a chain of store
1336 . If there is a "sender:" header and the message is locally originated,
1337 throw it away, unless the caller is trusted, or unless
1338 active_local_sender_retain is set - which can only happen if
1339 active_local_from_check is false.
1341 . If recipients are to be extracted from the message, build the
1342 recipients list from the headers, removing any that were on the
1343 original recipients list (unless extract_addresses_remove_arguments is
1344 false), and at the same time, remove any bcc header that may be present.
1346 . Get the spool file for the data, sort out its unique name, open
1347 and lock it (but don't give it the name yet).
1349 . Generate a "Message-Id" header if the message doesn't have one, for
1350 locally-originated messages.
1352 . Generate a "Received" header.
1354 . Ensure the recipients list is fully qualified and rewritten if necessary.
1356 . If there are any rewriting rules, apply them to the sender address
1357 and also to the headers.
1359 . If there is no from: header, generate one, for locally-generated messages
1360 and messages in "submission mode" only.
1362 . If the sender is local, check that from: is correct, and if not, generate
1363 a Sender: header, unless message comes from a trusted caller, or this
1364 feature is disabled by active_local_from_check being false.
1366 . If there is no "date" header, generate one, for locally-originated
1367 or submission mode messages only.
1369 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1370 dot_ends mode, to the data file. Leave it open, to hold the lock.
1372 . Write the envelope and the headers to a new file.
1374 . Set the name for the header file; close it.
1376 . Set the name for the data file; close it.
1378 Because this function can potentially be called many times in a single
1379 SMTP connection, all store should be got by store_get(), so that it will be
1380 automatically retrieved after the message is accepted.
1382 FUDGE: It seems that sites on the net send out messages with just LF
1383 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1384 we make the CRs optional in all cases.
1386 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1387 new regime is now in place in which bare CRs in header lines are turned into LF
1388 followed by a space, so as not to terminate the header line.
1390 February 2004: A bare LF in a header line in a message whose first line was
1391 terminated by CRLF is treated in the same way as a bare CR.
1394 extract_recip TRUE if recipients are to be extracted from the message's
1397 Returns: TRUE there are more messages to be read (SMTP input)
1398 FALSE there are no more messages to be read (non-SMTP input
1399 or SMTP connection collapsed, or other failure)
1401 When reading a message for filter testing, the returned value indicates
1402 whether the headers (which is all that is read) were terminated by '.' or
1406 receive_msg(BOOL extract_recip)
1411 int process_info_len = Ustrlen(process_info);
1412 int error_rc = (error_handling == ERRORS_SENDER)?
1413 errors_sender_rc : EXIT_FAILURE;
1414 int header_size = 256;
1415 int start, end, domain, size, sptr;
1418 int prevlines_length = 0;
1420 register int ptr = 0;
1422 BOOL contains_resent_headers = FALSE;
1423 BOOL extracted_ignored = FALSE;
1424 BOOL first_line_ended_crlf = TRUE_UNSET;
1425 BOOL smtp_yield = TRUE;
1428 BOOL resents_exist = FALSE;
1429 uschar *resent_prefix = US"";
1430 uschar *blackholed_by = NULL;
1431 uschar *blackhole_log_msg = US"";
1432 int cutthrough_done = 0;
1435 error_block *bad_addresses = NULL;
1437 uschar *frozen_by = NULL;
1438 uschar *queued_by = NULL;
1441 struct stat statbuf;
1443 /* Final message to give to SMTP caller, and messages from ACLs */
1445 uschar *smtp_reply = NULL;
1446 uschar *user_msg, *log_msg;
1448 /* Working header pointers */
1450 header_line *h, *next;
1452 /* Flags for noting the existence of certain headers (only one left) */
1454 BOOL date_header_exists = FALSE;
1456 /* Pointers to receive the addresses of headers whose contents we need. */
1458 header_line *from_header = NULL;
1459 header_line *subject_header = NULL;
1460 header_line *msgid_header = NULL;
1461 header_line *received_header;
1463 /* Variables for use when building the Received: header. */
1468 /* Release any open files that might have been cached while preparing to
1469 accept the message - e.g. by verifying addresses - because reading a message
1470 might take a fair bit of real time. */
1474 /* Extracting the recipient list from an input file is incompatible with
1475 cutthrough delivery with the no-spool option. It shouldn't be possible
1476 to set up the combination, but just in case kill any ongoing connection. */
1477 if (extract_recip || !smtp_input)
1478 cancel_cutthrough_connection("not smtp input");
1480 /* Initialize the chain of headers by setting up a place-holder for Received:
1481 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1482 pointing to the end of the chain to make adding headers simple. */
1484 received_header = header_list = header_last = store_get(sizeof(header_line));
1485 header_list->next = NULL;
1486 header_list->type = htype_old;
1487 header_list->text = NULL;
1488 header_list->slen = 0;
1490 /* Control block for the next header to be read. */
1492 next = store_get(sizeof(header_line));
1493 next->text = store_get(header_size);
1495 /* Initialize message id to be null (indicating no message read), and the
1496 header names list to be the normal list. Indicate there is no data file open
1497 yet, initialize the size and warning count, and deal with no size limit. */
1505 received_count = 1; /* For the one we will add */
1507 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1509 /* While reading the message, the following counts are computed. */
1511 message_linecount = body_linecount = body_zerocount =
1512 max_received_linelength = 0;
1514 #ifndef DISABLE_DKIM
1515 /* Call into DKIM to set up the context. */
1516 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1519 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1520 ids, and fractions of a second are required. See the comments that precede the
1521 message id creation below. */
1523 (void)gettimeofday(&message_id_tv, NULL);
1525 /* For other uses of the received time we can operate with granularity of one
1526 second, and for that we use the global variable received_time. This is for
1527 things like ultimate message timeouts. */
1529 received_time = message_id_tv.tv_sec;
1531 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1532 happen in the smtp_getc() function when it refills its buffer. */
1534 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1536 /* If not SMTP input, timeout happens only if configured, and we just set a
1537 single timeout for the whole message. */
1539 else if (receive_timeout > 0)
1541 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1542 alarm(receive_timeout);
1545 /* SIGTERM and SIGINT are caught always. */
1547 signal(SIGTERM, data_sigterm_sigint_handler);
1548 signal(SIGINT, data_sigterm_sigint_handler);
1550 /* Header lines in messages are not supposed to be very long, though when
1551 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1552 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1553 storing the header, and extend this as necessary using string_cat().
1555 To cope with total lunacies, impose an upper limit on the length of the header
1556 section of the message, as otherwise the store will fill up. We must also cope
1557 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1558 Folded header lines are joined into one string, leaving the '\n' characters
1559 inside them, so that writing them out reproduces the input.
1561 Loop for each character of each header; the next structure for chaining the
1562 header is set up already, with ptr the offset of the next character in
1567 int ch = (receive_getc)();
1569 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1570 SMTP must have a correct "." terminator. */
1572 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1574 smtp_reply = handle_lost_connection(US" (header)");
1576 goto TIDYUP; /* Skip to end of function */
1579 /* See if we are at the current header's size limit - there must be at least
1580 four bytes left. This allows for the new character plus a zero, plus two for
1581 extra insertions when we are playing games with dots and carriage returns. If
1582 we are at the limit, extend the text buffer. This could have been done
1583 automatically using string_cat() but because this is a tightish loop storing
1584 only one character at a time, we choose to do it inline. Normally
1585 store_extend() will be able to extend the block; only at the end of a big
1586 store block will a copy be needed. To handle the case of very long headers
1587 (and sometimes lunatic messages can have ones that are 100s of K long) we
1588 call store_release() for strings that have been copied - if the string is at
1589 the start of a block (and therefore the only thing in it, because we aren't
1590 doing any other gets), the block gets freed. We can only do this because we
1591 know there are no other calls to store_get() going on. */
1593 if (ptr >= header_size - 4)
1595 int oldsize = header_size;
1596 /* header_size += 256; */
1598 if (!store_extend(next->text, oldsize, header_size))
1600 uschar *newtext = store_get(header_size);
1601 memcpy(newtext, next->text, ptr);
1602 store_release(next->text);
1603 next->text = newtext;
1607 /* Cope with receiving a binary zero. There is dispute about whether
1608 these should be allowed in RFC 822 messages. The middle view is that they
1609 should not be allowed in headers, at least. Exim takes this attitude at
1610 the moment. We can't just stomp on them here, because we don't know that
1611 this line is a header yet. Set a flag to cause scanning later. */
1613 if (ch == 0) had_zero++;
1615 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1616 those from data files use just LF. Treat LF in local SMTP input as a
1617 terminator too. Treat EOF as a line terminator always. */
1619 if (ch == EOF) goto EOL;
1621 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1622 other MTAs accept this. We are therefore forced into this "liberalisation"
1623 too, so we accept LF as a line terminator whatever the source of the message.
1624 However, if the first line of the message ended with a CRLF, we treat a bare
1625 LF specially by inserting a white space after it to ensure that the header
1626 line is not terminated. */
1630 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1631 else if (first_line_ended_crlf) receive_ungetc(' ');
1635 /* This is not the end of the line. If this is SMTP input and this is
1636 the first character in the line and it is a "." character, ignore it.
1637 This implements the dot-doubling rule, though header lines starting with
1638 dots aren't exactly common. They are legal in RFC 822, though. If the
1639 following is CRLF or LF, this is the line that that terminates the
1640 entire message. We set message_ended to indicate this has happened (to
1641 prevent further reading), and break out of the loop, having freed the
1642 empty header, and set next = NULL to indicate no data line. */
1644 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1646 ch = (receive_getc)();
1649 ch = (receive_getc)();
1653 ch = '\r'; /* Revert to CR */
1658 message_ended = END_DOT;
1661 break; /* End character-reading loop */
1664 /* For non-SMTP input, the dot at the start of the line was really a data
1665 character. What is now in ch is the following character. We guaranteed
1666 enough space for this above. */
1670 next->text[ptr++] = '.';
1675 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1676 remember this case if this is the first line ending. */
1680 ch = (receive_getc)();
1683 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1687 /* Otherwise, put back the character after CR, and turn the bare CR
1690 ch = (receive_ungetc)(ch);
1691 next->text[ptr++] = '\n';
1696 /* We have a data character for the header line. */
1698 next->text[ptr++] = ch; /* Add to buffer */
1699 message_size++; /* Total message size so far */
1701 /* Handle failure due to a humungously long header section. The >= allows
1702 for the terminating \n. Add what we have so far onto the headers list so
1703 that it gets reflected in any error message, and back up the just-read
1706 if (message_size >= header_maxsize)
1708 next->text[ptr] = 0;
1710 next->type = htype_other;
1712 header_last->next = next;
1715 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1716 "%s (more than %d characters): message abandoned",
1717 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1721 smtp_reply = US"552 Message header is ridiculously long";
1722 receive_swallow_smtp();
1723 goto TIDYUP; /* Skip to end of function */
1728 give_local_error(ERRMESS_VLONGHEADER,
1729 string_sprintf("message header longer than %d characters received: "
1730 "message not accepted", header_maxsize), US"", error_rc, stdin,
1732 /* Does not return */
1736 continue; /* With next input character */
1738 /* End of header line reached */
1742 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1744 receive_linecount++;
1745 message_linecount++;
1747 /* Keep track of maximum line length */
1749 if (ptr - prevlines_length > max_received_linelength)
1750 max_received_linelength = ptr - prevlines_length;
1751 prevlines_length = ptr + 1;
1753 /* Now put in the terminating newline. There is always space for
1754 at least two more characters. */
1756 next->text[ptr++] = '\n';
1759 /* A blank line signals the end of the headers; release the unwanted
1760 space and set next to NULL to indicate this. */
1769 /* There is data in the line; see if the next input character is a
1770 whitespace character. If it is, we have a continuation of this header line.
1771 There is always space for at least one character at this point. */
1775 int nextch = (receive_getc)();
1776 if (nextch == ' ' || nextch == '\t')
1778 next->text[ptr++] = nextch;
1780 continue; /* Iterate the loop */
1782 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1783 else ch = EOF; /* Cause main loop to exit at end */
1786 /* We have got to the real line end. Terminate the string and release store
1787 beyond it. If it turns out to be a real header, internal binary zeros will
1788 be squashed later. */
1790 next->text[ptr] = 0;
1792 store_reset(next->text + ptr + 1);
1794 /* Check the running total size against the overall message size limit. We
1795 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1796 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1797 headers - the code to read the body will then also hit the buffer. */
1799 if (message_size > thismessage_size_limit) break;
1801 /* A line that is not syntactically correct for a header also marks
1802 the end of the headers. In this case, we leave next containing the
1803 first data line. This might actually be several lines because of the
1804 continuation logic applied above, but that doesn't matter.
1806 It turns out that smail, and presumably sendmail, accept leading lines
1809 From ph10 Fri Jan 5 12:35 GMT 1996
1811 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1812 find any documentation of this, but for compatibility it had better be
1813 accepted. Exim restricts it to the case of non-smtp messages, and
1814 treats it as an alternative to the -f command line option. Thus it is
1815 ignored except for trusted users or filter testing. Otherwise it is taken
1816 as the sender address, unless -f was used (sendmail compatibility).
1818 It further turns out that some UUCPs generate the From_line in a different
1821 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1823 The regex for matching these things is now capable of recognizing both
1824 formats (including 2- and 4-digit years in the latter). In fact, the regex
1825 is now configurable, as is the expansion string to fish out the sender.
1827 Even further on it has been discovered that some broken clients send
1828 these lines in SMTP messages. There is now an option to ignore them from
1829 specified hosts or networks. Sigh. */
1831 if (header_last == header_list &&
1834 (sender_host_address != NULL &&
1835 verify_check_host(&ignore_fromline_hosts) == OK)
1837 (sender_host_address == NULL && ignore_fromline_local)
1839 regex_match_and_setup(regex_From, next->text, 0, -1))
1841 if (!sender_address_forced)
1843 uschar *uucp_sender = expand_string(uucp_from_sender);
1844 if (uucp_sender == NULL)
1846 log_write(0, LOG_MAIN|LOG_PANIC,
1847 "expansion of \"%s\" failed after matching "
1848 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1852 int start, end, domain;
1854 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1855 &start, &end, &domain, TRUE);
1856 if (newsender != NULL)
1858 if (domain == 0 && newsender[0] != 0)
1859 newsender = rewrite_address_qualify(newsender, FALSE);
1861 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1863 sender_address = newsender;
1865 if (trusted_caller || filter_test != FTEST_NONE)
1867 authenticated_sender = NULL;
1868 originator_name = US"";
1869 sender_local = FALSE;
1872 if (filter_test != FTEST_NONE)
1873 printf("Sender taken from \"From \" line\n");
1880 /* Not a leading "From " line. Check to see if it is a valid header line.
1881 Header names may contain any non-control characters except space and colon,
1886 uschar *p = next->text;
1888 /* If not a valid header line, break from the header reading loop, leaving
1889 next != NULL, indicating that it holds the first line of the body. */
1891 if (isspace(*p)) break;
1892 while (mac_isgraph(*p) && *p != ':') p++;
1893 while (isspace(*p)) p++;
1896 body_zerocount = had_zero;
1900 /* We have a valid header line. If there were any binary zeroes in
1901 the line, stomp on them here. */
1904 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1906 /* It is perfectly legal to have an empty continuation line
1907 at the end of a header, but it is confusing to humans
1908 looking at such messages, since it looks like a blank line.
1909 Reduce confusion by removing redundant white space at the
1910 end. We know that there is at least one printing character
1911 (the ':' tested for above) so there is no danger of running
1914 p = next->text + ptr - 2;
1917 while (*p == ' ' || *p == '\t') p--;
1918 if (*p != '\n') break;
1919 ptr = (p--) - next->text + 1;
1920 message_size -= next->slen - ptr;
1921 next->text[ptr] = 0;
1925 /* Add the header to the chain */
1927 next->type = htype_other;
1929 header_last->next = next;
1932 /* Check the limit for individual line lengths. This comes after adding to
1933 the chain so that the failing line is reflected if a bounce is generated
1934 (for a local message). */
1936 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1938 log_write(0, LOG_MAIN, "overlong message header line received from "
1939 "%s (more than %d characters): message abandoned",
1940 sender_host_unknown? sender_ident : sender_fullhost,
1941 header_line_maxsize);
1945 smtp_reply = US"552 A message header line is too long";
1946 receive_swallow_smtp();
1947 goto TIDYUP; /* Skip to end of function */
1952 give_local_error(ERRMESS_VLONGHDRLINE,
1953 string_sprintf("message header line longer than %d characters "
1954 "received: message not accepted", header_line_maxsize), US"",
1955 error_rc, stdin, header_list->next);
1956 /* Does not return */
1960 /* Note if any resent- fields exist. */
1962 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1964 resents_exist = TRUE;
1965 resent_prefix = US"Resent-";
1969 /* The line has been handled. If we have hit EOF, break out of the loop,
1970 indicating no pending data line. */
1972 if (ch == EOF) { next = NULL; break; }
1974 /* Set up for the next header */
1977 next = store_get(sizeof(header_line));
1978 next->text = store_get(header_size);
1981 prevlines_length = 0;
1982 } /* Continue, starting to read the next header */
1984 /* At this point, we have read all the headers into a data structure in main
1985 store. The first header is still the dummy placeholder for the Received: header
1986 we are going to generate a bit later on. If next != NULL, it contains the first
1987 data line - which terminated the headers before reaching a blank line (not the
1992 debug_printf(">>Headers received:\n");
1993 for (h = header_list->next; h != NULL; h = h->next)
1994 debug_printf("%s", h->text);
1998 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1999 is dropped immediately after valid headers, the next thing we will see is EOF.
2000 We must test for this specially, as further down the reading of the data is
2001 skipped if already at EOF. */
2003 if (smtp_input && (receive_feof)())
2005 smtp_reply = handle_lost_connection(US" (after header)");
2007 goto TIDYUP; /* Skip to end of function */
2010 /* If this is a filter test run and no headers were read, output a warning
2011 in case there is a mistake in the test message. */
2013 if (filter_test != FTEST_NONE && header_list->next == NULL)
2014 printf("Warning: no message headers read\n");
2017 /* Scan the headers to identify them. Some are merely marked for later
2018 processing; some are dealt with here. */
2020 for (h = header_list->next; h != NULL; h = h->next)
2022 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2023 if (is_resent) contains_resent_headers = TRUE;
2025 switch (header_checkname(h, is_resent))
2028 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2032 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2035 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2038 if (!resents_exist || is_resent) date_header_exists = TRUE;
2041 /* Same comments as about Return-Path: below. */
2043 case htype_delivery_date:
2044 if (delivery_date_remove) h->type = htype_old;
2047 /* Same comments as about Return-Path: below. */
2049 case htype_envelope_to:
2050 if (envelope_to_remove) h->type = htype_old;
2053 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2054 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2055 header consists of just the login id of the user who called Exim, rewrite
2056 it with the gecos field first. Apply this rule to Resent-From: if there
2057 are resent- fields. */
2060 h->type = htype_from;
2061 if (!resents_exist || is_resent)
2067 uschar *s = Ustrchr(h->text, ':') + 1;
2068 while (isspace(*s)) s++;
2069 len = h->slen - (s - h->text) - 1;
2070 if (Ustrlen(originator_login) == len &&
2071 strncmpic(s, originator_login, len) == 0)
2073 uschar *name = is_resent? US"Resent-From" : US"From";
2074 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2075 originator_login, qualify_domain_sender);
2076 from_header = header_last;
2077 h->type = htype_old;
2078 DEBUG(D_receive|D_rewrite)
2079 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2085 /* Identify the Message-id: header for generating "in-reply-to" in the
2086 autoreply transport. For incoming logging, save any resent- value. In both
2087 cases, take just the first of any multiples. */
2090 if (msgid_header == NULL && (!resents_exist || is_resent))
2097 /* Flag all Received: headers */
2099 case htype_received:
2100 h->type = htype_received;
2104 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2106 case htype_reply_to:
2107 h->type = htype_reply_to;
2110 /* The Return-path: header is supposed to be added to messages when
2111 they leave the SMTP system. We shouldn't receive messages that already
2112 contain Return-path. However, since Exim generates Return-path: on
2113 local delivery, resent messages may well contain it. We therefore
2114 provide an option (which defaults on) to remove any Return-path: headers
2115 on input. Removal actually means flagging as "old", which prevents the
2116 header being transmitted with the message. */
2118 case htype_return_path:
2119 if (return_path_remove) h->type = htype_old;
2121 /* If we are testing a mail filter file, use the value of the
2122 Return-Path: header to set up the return_path variable, which is not
2123 otherwise set. However, remove any <> that surround the address
2124 because the variable doesn't have these. */
2126 if (filter_test != FTEST_NONE)
2128 uschar *start = h->text + 12;
2129 uschar *end = start + Ustrlen(start);
2130 while (isspace(*start)) start++;
2131 while (end > start && isspace(end[-1])) end--;
2132 if (*start == '<' && end[-1] == '>')
2137 return_path = string_copyn(start, end - start);
2138 printf("Return-path taken from \"Return-path:\" header line\n");
2142 /* If there is a "Sender:" header and the message is locally originated,
2143 and from an untrusted caller and suppress_local_fixups is not set, or if we
2144 are in submission mode for a remote message, mark it "old" so that it will
2145 not be transmitted with the message, unless active_local_sender_retain is
2146 set. (This can only be true if active_local_from_check is false.) If there
2147 are any resent- headers in the message, apply this rule to Resent-Sender:
2148 instead of Sender:. Messages with multiple resent- header sets cannot be
2149 tidily handled. (For this reason, at least one MUA - Pine - turns old
2150 resent- headers into X-resent- headers when resending, leaving just one
2154 h->type = ((!active_local_sender_retain &&
2156 (sender_local && !trusted_caller && !suppress_local_fixups)
2160 (!resents_exist||is_resent))?
2161 htype_old : htype_sender;
2164 /* Remember the Subject: header for logging. There is no Resent-Subject */
2170 /* "To:" gets flagged, and the existence of a recipient header is noted,
2171 whether it's resent- or not. */
2176 to_or_cc_header_exists = TRUE;
2182 /* Extract recipients from the headers if that is required (the -t option).
2183 Note that this is documented as being done *before* any address rewriting takes
2184 place. There are two possibilities:
2186 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2187 recipients already listed are to be REMOVED from the message. Smail 3 works
2188 like this. We need to build a non-recipients tree for that list, because in
2189 subsequent processing this data is held in a tree and that's what the
2190 spool_write_header() function expects. Make sure that non-recipient addresses
2191 are fully qualified and rewritten if necessary.
2193 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2194 those in the command line arguments (and it is rumoured some other MTAs do
2195 this). Therefore, there is an option to make Exim behave this way.
2197 *** Notes on "Resent-" header lines ***
2199 The presence of resent-headers in the message makes -t horribly ambiguous.
2200 Experiments with sendmail showed that it uses recipients for all resent-
2201 headers, totally ignoring the concept of "sets of resent- headers" as described
2202 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2203 with all the addresses in one instance of each header.
2205 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2206 error for -t if there were resent- headers in the message. However, after a
2207 discussion on the mailing list, I've learned that there are MUAs that use
2208 resent- headers with -t, and also that the stuff about sets of resent- headers
2209 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2210 message with -t and resent- header lines makes sure that only *its* resent-
2211 headers are present; previous ones are often renamed as X-resent- for example.
2213 Consequently, Exim has been changed so that, if any resent- header lines are
2214 present, the recipients are taken from all of the appropriate resent- lines,
2215 and not from the ordinary To:, Cc:, etc. */
2220 error_block **bnext = &bad_addresses;
2222 if (extract_addresses_remove_arguments)
2224 while (recipients_count-- > 0)
2226 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2227 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2228 tree_add_nonrecipient(s);
2230 recipients_list = NULL;
2231 recipients_count = recipients_list_max = 0;
2234 /* Now scan the headers */
2236 for (h = header_list->next; h != NULL; h = h->next)
2238 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2239 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2241 uschar *s = Ustrchr(h->text, ':') + 1;
2242 while (isspace(*s)) s++;
2244 parse_allow_group = TRUE; /* Allow address group syntax */
2248 uschar *ss = parse_find_address_end(s, FALSE);
2249 uschar *recipient, *errmess, *p, *pp;
2250 int start, end, domain;
2252 /* Check on maximum */
2254 if (recipients_max > 0 && ++rcount > recipients_max)
2256 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2257 US"message rejected: ", error_rc, stdin, NULL);
2258 /* Does not return */
2261 /* Make a copy of the address, and remove any internal newlines. These
2262 may be present as a result of continuations of the header line. The
2263 white space that follows the newline must not be removed - it is part
2266 pp = recipient = store_get(ss - s + 1);
2267 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2269 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2272 /* Keep a list of all the bad addresses so we can send a single
2273 error message at the end. However, an empty address is not an error;
2274 just ignore it. This can come from an empty group list like
2276 To: Recipients of list:;
2278 If there are no recipients at all, an error will occur later. */
2280 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2282 int len = Ustrlen(s);
2283 error_block *b = store_get(sizeof(error_block));
2284 while (len > 0 && isspace(s[len-1])) len--;
2286 b->text1 = string_printing(string_copyn(s, len));
2292 /* If the recipient is already in the nonrecipients tree, it must
2293 have appeared on the command line with the option extract_addresses_
2294 remove_arguments set. Do not add it to the recipients, and keep a note
2295 that this has happened, in order to give a better error if there are
2296 no recipients left. */
2298 else if (recipient != NULL)
2300 if (tree_search(tree_nonrecipients, recipient) == NULL)
2301 receive_add_recipient(recipient, -1);
2303 extracted_ignored = TRUE;
2306 /* Move on past this address */
2308 s = ss + (*ss? 1:0);
2309 while (isspace(*s)) s++;
2310 } /* Next address */
2312 parse_allow_group = FALSE; /* Reset group syntax flags */
2313 parse_found_group = FALSE;
2315 /* If this was the bcc: header, mark it "old", which means it
2316 will be kept on the spool, but not transmitted as part of the
2319 if (h->type == htype_bcc) h->type = htype_old;
2320 } /* For appropriate header line */
2321 } /* For each header line */
2325 /* Now build the unique message id. This has changed several times over the
2326 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2327 Retaining all the history in the comment has become too unwieldy - read
2328 previous release sources if you want it.
2330 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2331 The first part is the current time, in seconds. The second part is the current
2332 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2333 can hold a number in the range 0-3843. It used to be a computed sequence
2334 number, but is now the fractional component of the current time in units of
2335 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2336 received, Exim ensures that the timer has ticked at the appropriate level
2337 before proceeding, to avoid duplication if the pid happened to be re-used
2338 within the same time period. It seems likely that most messages will take at
2339 least half a millisecond to be received, so no delay will normally be
2340 necessary. At least for some time...
2342 There is a modification when localhost_number is set. Formerly this was allowed
2343 to be as large as 255. Now it is restricted to the range 0-16, and the final
2344 component of the message id becomes (localhost_number * 200) + fractional time
2345 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2347 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2348 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2349 still allows the tttttt field to hold a large enough number to last for some
2350 more decades, and the final two-digit field can hold numbers up to 1295, which
2351 is enough for milliseconds (instead of 1/2000 of a second).
2353 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2354 pid, so it is probably safe because pids have to be positive. The
2355 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2356 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2358 Note that string_base62() returns its data in a static storage block, so it
2359 must be copied before calling string_base62() again. It always returns exactly
2362 There doesn't seem to be anything in the RFC which requires a message id to
2363 start with a letter, but Smail was changed to ensure this. The external form of
2364 the message id (as supplied by string expansion) therefore starts with an
2365 additional leading 'E'. The spool file names do not include this leading
2366 letter and it is not used internally.
2368 NOTE: If ever the format of message ids is changed, the regular expression for
2369 checking that a string is in this format must be updated in a corresponding
2370 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2371 must also be changed to reflect the correct string length. Then, of course,
2372 other programs that rely on the message id format will need updating too. */
2374 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2375 message_id[6] = '-';
2376 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2378 /* Deal with the case where the host number is set. The value of the number was
2379 checked when it was read, to ensure it isn't too big. The timing granularity is
2380 left in id_resolution so that an appropriate wait can be done after receiving
2381 the message, if necessary (we hope it won't be). */
2383 if (host_number_string != NULL)
2385 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2386 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2387 string_base62((long int)(
2388 host_number * (1000000/id_resolution) +
2389 message_id_tv.tv_usec/id_resolution)) + 4);
2392 /* Host number not set: final field is just the fractional time at an
2393 appropriate resolution. */
2397 id_resolution = (BASE_62 == 62)? 500 : 1000;
2398 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2399 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2402 /* Add the current message id onto the current process info string if
2405 (void)string_format(process_info + process_info_len,
2406 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2408 /* If we are using multiple input directories, set up the one for this message
2409 to be the least significant base-62 digit of the time of arrival. Otherwise
2410 ensure that it is an empty string. */
2412 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2414 /* Now that we have the message-id, if there is no message-id: header, generate
2415 one, but only for local (without suppress_local_fixups) or submission mode
2416 messages. This can be user-configured if required, but we had better flatten
2417 any illegal characters therein. */
2419 if (msgid_header == NULL &&
2420 ((sender_host_address == NULL && !suppress_local_fixups)
2421 || submission_mode))
2424 uschar *id_text = US"";
2425 uschar *id_domain = primary_hostname;
2427 /* Permit only letters, digits, dots, and hyphens in the domain */
2429 if (message_id_domain != NULL)
2431 uschar *new_id_domain = expand_string(message_id_domain);
2432 if (new_id_domain == NULL)
2434 if (!expand_string_forcedfail)
2435 log_write(0, LOG_MAIN|LOG_PANIC,
2436 "expansion of \"%s\" (message_id_header_domain) "
2437 "failed: %s", message_id_domain, expand_string_message);
2439 else if (*new_id_domain != 0)
2441 id_domain = new_id_domain;
2442 for (p = id_domain; *p != 0; p++)
2443 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2447 /* Permit all characters except controls and RFC 2822 specials in the
2448 additional text part. */
2450 if (message_id_text != NULL)
2452 uschar *new_id_text = expand_string(message_id_text);
2453 if (new_id_text == NULL)
2455 if (!expand_string_forcedfail)
2456 log_write(0, LOG_MAIN|LOG_PANIC,
2457 "expansion of \"%s\" (message_id_header_text) "
2458 "failed: %s", message_id_text, expand_string_message);
2460 else if (*new_id_text != 0)
2462 id_text = new_id_text;
2463 for (p = id_text; *p != 0; p++)
2464 if (mac_iscntrl_or_special(*p)) *p = '-';
2468 /* Add the header line
2469 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2470 * appended, to preserve classical expectations of header ordering. */
2472 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2473 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2474 (*id_text == 0)? "" : ".", id_text, id_domain);
2477 /* If we are to log recipients, keep a copy of the raw ones before any possible
2478 rewriting. Must copy the count, because later ACLs and the local_scan()
2479 function may mess with the real recipients. */
2481 if ((log_extra_selector & LX_received_recipients) != 0)
2483 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2484 for (i = 0; i < recipients_count; i++)
2485 raw_recipients[i] = string_copy(recipients_list[i].address);
2486 raw_recipients_count = recipients_count;
2489 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2490 recipients will get here only if the conditions were right (allow_unqualified_
2491 recipient is TRUE). */
2493 for (i = 0; i < recipients_count; i++)
2494 recipients_list[i].address =
2495 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2496 global_rewrite_rules, rewrite_existflags);
2498 /* If there is no From: header, generate one for local (without
2499 suppress_local_fixups) or submission_mode messages. If there is no sender
2500 address, but the sender is local or this is a local delivery error, use the
2501 originator login. This shouldn't happen for genuine bounces, but might happen
2502 for autoreplies. The addition of From: must be done *before* checking for the
2503 possible addition of a Sender: header, because untrusted_set_sender allows an
2504 untrusted user to set anything in the envelope (which might then get info
2505 From:) but we still want to ensure a valid Sender: if it is required. */
2507 if (from_header == NULL &&
2508 ((sender_host_address == NULL && !suppress_local_fixups)
2509 || submission_mode))
2511 uschar *oname = US"";
2513 /* Use the originator_name if this is a locally submitted message and the
2514 caller is not trusted. For trusted callers, use it only if -F was used to
2515 force its value or if we have a non-SMTP message for which -f was not used
2516 to set the sender. */
2518 if (sender_host_address == NULL)
2520 if (!trusted_caller || sender_name_forced ||
2521 (!smtp_input && !sender_address_forced))
2522 oname = originator_name;
2525 /* For non-locally submitted messages, the only time we use the originator
2526 name is when it was forced by the /name= option on control=submission. */
2530 if (submission_name != NULL) oname = submission_name;
2533 /* Envelope sender is empty */
2535 if (sender_address[0] == 0)
2537 uschar *fromstart, *fromend;
2539 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2540 oname, (oname[0] == 0)? "" : " <");
2541 fromend = (oname[0] == 0)? US"" : US">";
2543 if (sender_local || local_error_message)
2545 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2546 local_part_quote(originator_login), qualify_domain_sender,
2549 else if (submission_mode && authenticated_id != NULL)
2551 if (submission_domain == NULL)
2553 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2554 local_part_quote(authenticated_id), qualify_domain_sender,
2557 else if (submission_domain[0] == 0) /* empty => whole address set */
2559 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2564 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2565 local_part_quote(authenticated_id), submission_domain,
2568 from_header = header_last; /* To get it checked for Sender: */
2572 /* There is a non-null envelope sender. Build the header using the original
2573 sender address, before any rewriting that might have been done while
2578 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2580 (oname[0] == 0)? "" : " <",
2581 (sender_address_unrewritten == NULL)?
2582 sender_address : sender_address_unrewritten,
2583 (oname[0] == 0)? "" : ">");
2585 from_header = header_last; /* To get it checked for Sender: */
2590 /* If the sender is local (without suppress_local_fixups), or if we are in
2591 submission mode and there is an authenticated_id, check that an existing From:
2592 is correct, and if not, generate a Sender: header, unless disabled. Any
2593 previously-existing Sender: header was removed above. Note that sender_local,
2594 as well as being TRUE if the caller of exim is not trusted, is also true if a
2595 trusted caller did not supply a -f argument for non-smtp input. To allow
2596 trusted callers to forge From: without supplying -f, we have to test explicitly
2597 here. If the From: header contains more than one address, then the call to
2598 parse_extract_address fails, and a Sender: header is inserted, as required. */
2600 if (from_header != NULL &&
2601 (active_local_from_check &&
2602 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2603 (submission_mode && authenticated_id != NULL))
2606 BOOL make_sender = TRUE;
2607 int start, end, domain;
2609 uschar *from_address =
2610 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2611 &start, &end, &domain, FALSE);
2612 uschar *generated_sender_address;
2614 if (submission_mode)
2616 if (submission_domain == NULL)
2618 generated_sender_address = string_sprintf("%s@%s",
2619 local_part_quote(authenticated_id), qualify_domain_sender);
2621 else if (submission_domain[0] == 0) /* empty => full address */
2623 generated_sender_address = string_sprintf("%s",
2628 generated_sender_address = string_sprintf("%s@%s",
2629 local_part_quote(authenticated_id), submission_domain);
2633 generated_sender_address = string_sprintf("%s@%s",
2634 local_part_quote(originator_login), qualify_domain_sender);
2636 /* Remove permitted prefixes and suffixes from the local part of the From:
2637 address before doing the comparison with the generated sender. */
2639 if (from_address != NULL)
2642 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2644 if (at != NULL) *at = 0;
2645 from_address += route_check_prefix(from_address, local_from_prefix);
2646 slen = route_check_suffix(from_address, local_from_suffix);
2649 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2650 from_address += slen;
2652 if (at != NULL) *at = '@';
2654 if (strcmpic(generated_sender_address, from_address) == 0 ||
2655 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2656 make_sender = FALSE;
2659 /* We have to cause the Sender header to be rewritten if there are
2660 appropriate rewriting rules. */
2664 if (submission_mode && submission_name == NULL)
2665 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2666 generated_sender_address);
2668 header_add(htype_sender, "%sSender: %s <%s>\n",
2670 submission_mode? submission_name : originator_name,
2671 generated_sender_address);
2674 /* Ensure that a non-null envelope sender address corresponds to the
2675 submission mode sender address. */
2677 if (submission_mode && sender_address[0] != 0)
2679 if (sender_address_unrewritten == NULL)
2680 sender_address_unrewritten = sender_address;
2681 sender_address = generated_sender_address;
2682 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2683 log_write(L_address_rewrite, LOG_MAIN,
2684 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2685 sender_address_unrewritten, generated_sender_address);
2690 /* If there are any rewriting rules, apply them to the sender address, unless
2691 it has already been rewritten as part of verification for SMTP input. */
2693 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2694 sender_address[0] != 0)
2696 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2697 global_rewrite_rules, rewrite_existflags);
2698 DEBUG(D_receive|D_rewrite)
2699 debug_printf("rewritten sender = %s\n", sender_address);
2703 /* The headers must be run through rewrite_header(), because it ensures that
2704 addresses are fully qualified, as well as applying any rewriting rules that may
2707 Qualification of header addresses in a message from a remote host happens only
2708 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2709 appropriate. For local messages, qualification always happens, unless -bnq is
2710 used to explicitly suppress it. No rewriting is done for an unqualified address
2711 that is left untouched.
2713 We start at the second header, skipping our own Received:. This rewriting is
2714 documented as happening *after* recipient addresses are taken from the headers
2715 by the -t command line option. An added Sender: gets rewritten here. */
2717 for (h = header_list->next; h != NULL; h = h->next)
2719 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2720 rewrite_existflags, TRUE);
2721 if (newh != NULL) h = newh;
2725 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2726 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2727 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2728 exists, this applies to the set of resent- headers rather than the normal set.
2730 The requirement for a recipient header has been removed in RFC 2822. At this
2731 point in the code, earlier versions of Exim added a To: header for locally
2732 submitted messages, and an empty Bcc: header for others. In the light of the
2733 changes in RFC 2822, this was dropped in November 2003. */
2736 /* If there is no date header, generate one if the message originates locally
2737 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2738 submission mode flag is set. Messages without Date: are not valid, but it seems
2739 to be more confusing if Exim adds one to all remotely-originated messages.
2740 As per Message-Id, we prepend if resending, else append.
2743 if (!date_header_exists &&
2744 ((sender_host_address == NULL && !suppress_local_fixups)
2745 || submission_mode))
2746 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2747 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2749 search_tidyup(); /* Free any cached resources */
2751 /* Show the complete set of headers if debugging. Note that the first one (the
2752 new Received:) has not yet been set. */
2756 debug_printf(">>Headers after rewriting and local additions:\n");
2757 for (h = header_list->next; h != NULL; h = h->next)
2758 debug_printf("%c %s", h->type, h->text);
2762 /* The headers are now complete in store. If we are running in filter
2763 testing mode, that is all this function does. Return TRUE if the message
2764 ended with a dot. */
2766 if (filter_test != FTEST_NONE)
2768 process_info[process_info_len] = 0;
2769 return message_ended == END_DOT;
2772 /* Cutthrough delivery:
2773 We have to create the Received header now rather than at the end of reception,
2774 so the timestamp behaviour is a change to the normal case.
2775 XXX Ensure this gets documented XXX.
2776 Having created it, send the headers to the destination.
2778 if (cutthrough_fd >= 0)
2780 if (received_count > received_headers_max)
2782 cancel_cutthrough_connection("too many headers");
2783 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2784 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2785 "Too many \"Received\" headers",
2787 (sender_fullhost == NULL)? "" : " H=",
2788 (sender_fullhost == NULL)? US"" : sender_fullhost,
2789 (sender_ident == NULL)? "" : " U=",
2790 (sender_ident == NULL)? US"" : sender_ident);
2791 message_id[0] = 0; /* Indicate no message accepted */
2792 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2793 goto TIDYUP; /* Skip to end of function */
2795 received_header_gen();
2796 add_acl_headers(US"MAIL or RCPT");
2797 (void) cutthrough_headers_send();
2801 /* Open a new spool file for the data portion of the message. We need
2802 to access it both via a file descriptor and a stream. Try to make the
2803 directory if it isn't there. Note re use of sprintf: spool_directory
2804 is checked on input to be < 200 characters long. */
2806 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2808 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2811 if (errno == ENOENT)
2814 sprintf(CS temp, "input/%s", message_subdir);
2815 if (message_subdir[0] == 0) temp[5] = 0;
2816 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2817 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2820 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2821 spool_name, strerror(errno));
2824 /* Make sure the file's group is the Exim gid, and double-check the mode
2825 because the group setting doesn't always get set automatically. */
2827 if (fchown(data_fd, exim_uid, exim_gid))
2828 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2829 "Failed setting ownership on spool file %s: %s",
2830 spool_name, strerror(errno));
2831 (void)fchmod(data_fd, SPOOL_MODE);
2833 /* We now have data file open. Build a stream for it and lock it. We lock only
2834 the first line of the file (containing the message ID) because otherwise there
2835 are problems when Exim is run under Cygwin (I'm told). See comments in
2836 spool_in.c, where the same locking is done. */
2838 data_file = fdopen(data_fd, "w+");
2839 lock_data.l_type = F_WRLCK;
2840 lock_data.l_whence = SEEK_SET;
2841 lock_data.l_start = 0;
2842 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2844 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2845 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2846 errno, strerror(errno));
2848 /* We have an open, locked data file. Write the message id to it to make it
2849 self-identifying. Then read the remainder of the input of this message and
2850 write it to the data file. If the variable next != NULL, it contains the first
2851 data line (which was read as a header but then turned out not to have the right
2852 format); write it (remembering that it might contain binary zeros). The result
2853 of fwrite() isn't inspected; instead we call ferror() below. */
2855 fprintf(data_file, "%s-D\n", message_id);
2858 uschar *s = next->text;
2859 int len = next->slen;
2860 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2861 body_linecount++; /* Assumes only 1 line */
2864 /* Note that we might already be at end of file, or the logical end of file
2865 (indicated by '.'), or might have encountered an error while writing the
2866 message id or "next" line. */
2868 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2872 message_ended = read_message_data_smtp(data_file);
2873 receive_linecount++; /* The terminating "." line */
2875 else message_ended = read_message_data(data_file);
2877 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2878 message_linecount += body_linecount;
2880 /* Handle premature termination of SMTP */
2882 if (smtp_input && message_ended == END_EOF)
2884 Uunlink(spool_name); /* Lose data file when closed */
2885 cancel_cutthrough_connection("sender closed connection");
2886 message_id[0] = 0; /* Indicate no message accepted */
2887 smtp_reply = handle_lost_connection(US"");
2889 goto TIDYUP; /* Skip to end of function */
2892 /* Handle message that is too big. Don't use host_or_ident() in the log
2893 message; we want to see the ident value even for non-remote messages. */
2895 if (message_ended == END_SIZE)
2897 Uunlink(spool_name); /* Lose the data file when closed */
2898 cancel_cutthrough_connection("mail too big");
2899 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2901 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2902 "message too big: read=%d max=%d",
2904 (sender_fullhost == NULL)? "" : " H=",
2905 (sender_fullhost == NULL)? US"" : sender_fullhost,
2906 (sender_ident == NULL)? "" : " U=",
2907 (sender_ident == NULL)? US"" : sender_ident,
2909 thismessage_size_limit);
2913 smtp_reply = US"552 Message size exceeds maximum permitted";
2914 message_id[0] = 0; /* Indicate no message accepted */
2915 goto TIDYUP; /* Skip to end of function */
2919 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2920 give_local_error(ERRMESS_TOOBIG,
2921 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2922 US"message rejected: ", error_rc, data_file, header_list);
2923 /* Does not return */
2928 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2929 example, there may be some expansion in an ACL that uses a timer.) */
2931 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2933 /* The message body has now been read into the data file. Call fflush() to
2934 empty the buffers in C, and then call fsync() to get the data written out onto
2935 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2936 having to do this). If there was an I/O error on either input or output,
2937 attempt to send an error message, and unlink the spool file. For non-SMTP input
2938 we can then give up. Note that for SMTP input we must swallow the remainder of
2939 the input in cases of output errors, since the far end doesn't expect to see
2940 anything until the terminating dot line is sent. */
2942 if (fflush(data_file) == EOF || ferror(data_file) ||
2943 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2945 uschar *msg_errno = US strerror(errno);
2946 BOOL input_error = (receive_ferror)() != 0;
2947 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2948 input_error? "Input read" : "Spool write",
2950 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2952 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2953 Uunlink(spool_name); /* Lose the data file */
2954 cancel_cutthrough_connection("error writing spoolfile");
2959 smtp_reply = US"451 Error while reading input data";
2962 smtp_reply = US"451 Error while writing spool file";
2963 receive_swallow_smtp();
2965 message_id[0] = 0; /* Indicate no message accepted */
2966 goto TIDYUP; /* Skip to end of function */
2971 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2972 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2974 /* Does not return */
2979 /* No I/O errors were encountered while writing the data file. */
2981 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2984 /* If there were any bad addresses extracted by -t, or there were no recipients
2985 left after -t, send a message to the sender of this message, or write it to
2986 stderr if the error handling option is set that way. Note that there may
2987 legitimately be no recipients for an SMTP message if they have all been removed
2990 We need to rewind the data file in order to read it. In the case of no
2991 recipients or stderr error writing, throw the data file away afterwards, and
2992 exit. (This can't be SMTP, which always ensures there's at least one
2993 syntactically good recipient address.) */
2995 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2999 if (recipients_count == 0) debug_printf("*** No recipients\n");
3000 if (bad_addresses != NULL)
3002 error_block *eblock = bad_addresses;
3003 debug_printf("*** Bad address(es)\n");
3004 while (eblock != NULL)
3006 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3007 eblock = eblock->next;
3012 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3014 /* If configured to send errors to the sender, but this fails, force
3015 a failure error code. We use a special one for no recipients so that it
3016 can be detected by the autoreply transport. Otherwise error_rc is set to
3017 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3018 it is EXIT_SUCCESS. */
3020 if (error_handling == ERRORS_SENDER)
3022 if (!moan_to_sender(
3023 (bad_addresses == NULL)?
3024 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3025 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3026 bad_addresses, header_list, data_file, FALSE))
3027 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3031 if (bad_addresses == NULL)
3033 if (extracted_ignored)
3034 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3036 fprintf(stderr, "exim: no recipients in message\n");
3040 fprintf(stderr, "exim: invalid address%s",
3041 (bad_addresses->next == NULL)? ":" : "es:\n");
3042 while (bad_addresses != NULL)
3044 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3045 bad_addresses->text2);
3046 bad_addresses = bad_addresses->next;
3051 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3053 Uunlink(spool_name);
3054 (void)fclose(data_file);
3055 exim_exit(error_rc);
3059 /* Data file successfully written. Generate text for the Received: header by
3060 expanding the configured string, and adding a timestamp. By leaving this
3061 operation till now, we ensure that the timestamp is the time that message
3062 reception was completed. However, this is deliberately done before calling the
3063 data ACL and local_scan().
3065 This Received: header may therefore be inspected by the data ACL and by code in
3066 the local_scan() function. When they have run, we update the timestamp to be
3067 the final time of reception.
3069 If there is just one recipient, set up its value in the $received_for variable
3070 for use when we generate the Received: header.
3072 Note: the checking for too many Received: headers is handled by the delivery
3074 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3076 if (received_header->text == NULL) /* Non-cutthrough case */
3078 received_header_gen();
3080 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3082 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3083 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3085 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3086 now, before running the DATA ACL. */
3088 add_acl_headers(US"MAIL or RCPT");
3091 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3092 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3094 /* If an ACL is specified for checking things at this stage of reception of a
3095 message, run it, unless all the recipients were removed by "discard" in earlier
3096 ACLs. That is the only case in which recipients_count can be zero at this
3097 stage. Set deliver_datafile to point to the data file so that $message_body and
3098 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3101 deliver_datafile = data_fd;
3104 enable_dollar_recipients = TRUE;
3106 if (recipients_count == 0)
3108 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3112 /* Handle interactive SMTP messages */
3114 if (smtp_input && !smtp_batched_input)
3117 #ifndef DISABLE_DKIM
3118 if (!dkim_disable_verify)
3120 /* Finish verification, this will log individual signature results to
3122 dkim_exim_verify_finish();
3124 /* Check if we must run the DKIM ACL */
3125 if ((acl_smtp_dkim != NULL) &&
3126 (dkim_verify_signers != NULL) &&
3127 (dkim_verify_signers[0] != '\0'))
3129 uschar *dkim_verify_signers_expanded =
3130 expand_string(dkim_verify_signers);
3131 if (dkim_verify_signers_expanded == NULL)
3133 log_write(0, LOG_MAIN|LOG_PANIC,
3134 "expansion of dkim_verify_signers option failed: %s",
3135 expand_string_message);
3140 uschar *ptr = dkim_verify_signers_expanded;
3141 uschar *item = NULL;
3142 uschar *seen_items = NULL;
3143 int seen_items_size = 0;
3144 int seen_items_offset = 0;
3145 uschar itembuf[256];
3146 /* Default to OK when no items are present */
3148 while ((item = string_nextinlist(&ptr, &sep,
3150 sizeof(itembuf))) != NULL)
3152 /* Prevent running ACL for an empty item */
3153 if (!item || (item[0] == '\0')) continue;
3154 /* Only run ACL once for each domain or identity, no matter how often it
3155 appears in the expanded list. */
3156 if (seen_items != NULL)
3158 uschar *seen_item = NULL;
3159 uschar seen_item_buf[256];
3160 uschar *seen_items_list = seen_items;
3161 int seen_this_item = 0;
3163 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3165 sizeof(seen_item_buf))) != NULL)
3167 if (Ustrcmp(seen_item,item) == 0)
3174 if (seen_this_item > 0)
3177 debug_printf("acl_smtp_dkim: skipping signer %s, already seen\n", item);
3181 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,":");
3184 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,item);
3185 seen_items[seen_items_offset] = '\0';
3188 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n", item);
3190 dkim_exim_acl_setup(item);
3191 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, &user_msg, &log_msg);
3196 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, skipping remaining items\n", rc, item);
3197 cancel_cutthrough_connection("dkim acl not ok");
3201 add_acl_headers(US"DKIM");
3204 recipients_count = 0;
3205 blackholed_by = US"DKIM ACL";
3206 if (log_msg != NULL)
3207 blackhole_log_msg = string_sprintf(": %s", log_msg);
3211 Uunlink(spool_name);
3212 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3213 smtp_yield = FALSE; /* No more messsages after dropped connection */
3214 smtp_reply = US""; /* Indicate reply already sent */
3215 message_id[0] = 0; /* Indicate no message accepted */
3216 goto TIDYUP; /* Skip to end of function */
3221 #endif /* DISABLE_DKIM */
3223 #ifdef WITH_CONTENT_SCAN
3224 if (recipients_count > 0 &&
3225 acl_smtp_mime != NULL &&
3226 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3228 #endif /* WITH_CONTENT_SCAN */
3230 #ifdef EXPERIMENTAL_PRDR
3231 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr != NULL )
3235 int all_fail = FAIL;
3237 smtp_printf("353 PRDR content analysis beginning\r\n");
3238 /* Loop through recipients, responses must be in same order received */
3239 for (c = 0; recipients_count > c; c++)
3241 uschar * addr= recipients_list[c].address;
3242 uschar * msg= US"PRDR R=<%s> %s";
3245 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3246 addr, c+1, recipients_count);
3247 rc = acl_check(ACL_WHERE_PRDR, addr,
3248 acl_smtp_data_prdr, &user_msg, &log_msg);
3250 /* If any recipient rejected content, indicate it in final message */
3252 /* If all recipients rejected, indicate in final message */
3257 case OK: case DISCARD: code = US"250"; break;
3258 case DEFER: code = US"450"; break;
3259 default: code = US"550"; break;
3261 if (user_msg != NULL)
3262 smtp_user_msg(code, user_msg);
3267 case OK: case DISCARD:
3268 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3270 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3272 msg = string_sprintf(CS msg, addr, "refusal"); break;
3274 smtp_user_msg(code, msg);
3276 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3277 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3278 else log_write(0, LOG_MAIN, CS msg);
3280 if (rc != OK) { receive_remove_recipient(addr); c--; }
3282 /* Set up final message, used if data acl gives OK */
3283 smtp_reply = string_sprintf("%s id=%s message %s",
3284 all_fail == FAIL ? US"550" : US"250",
3287 ? US"rejected for all recipients"
3290 : US"accepted for some recipients");
3291 if (recipients_count == 0)
3293 message_id[0] = 0; /* Indicate no message accepted */
3298 prdr_requested = FALSE;
3299 #endif /* EXPERIMENTAL_PRDR */
3301 /* Check the recipients count again, as the MIME ACL might have changed
3304 if (acl_smtp_data != NULL && recipients_count > 0)
3306 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3307 add_acl_headers(US"DATA");
3310 recipients_count = 0;
3311 blackholed_by = US"DATA ACL";
3312 if (log_msg != NULL)
3313 blackhole_log_msg = string_sprintf(": %s", log_msg);
3314 cancel_cutthrough_connection("data acl discard");
3318 Uunlink(spool_name);
3319 cancel_cutthrough_connection("data acl not ok");
3320 #ifdef WITH_CONTENT_SCAN
3323 #ifdef EXPERIMENTAL_DCC
3326 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3327 smtp_yield = FALSE; /* No more messsages after dropped connection */
3328 smtp_reply = US""; /* Indicate reply already sent */
3329 message_id[0] = 0; /* Indicate no message accepted */
3330 goto TIDYUP; /* Skip to end of function */
3335 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3336 we cannot take different actions for permanent and temporary rejections. */
3341 #ifdef WITH_CONTENT_SCAN
3342 if (acl_not_smtp_mime != NULL &&
3343 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3346 #endif /* WITH_CONTENT_SCAN */
3348 if (acl_not_smtp != NULL)
3350 uschar *user_msg, *log_msg;
3351 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3354 recipients_count = 0;
3355 blackholed_by = US"non-SMTP ACL";
3356 if (log_msg != NULL)
3357 blackhole_log_msg = string_sprintf(": %s", log_msg);
3361 Uunlink(spool_name);
3362 #ifdef WITH_CONTENT_SCAN
3365 #ifdef EXPERIMENTAL_DCC
3368 /* The ACL can specify where rejections are to be logged, possibly
3369 nowhere. The default is main and reject logs. */
3371 if (log_reject_target != 0)
3372 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3373 sender_address, log_msg);
3375 if (user_msg == NULL) user_msg = US"local configuration problem";
3376 if (smtp_batched_input)
3378 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3379 /* Does not return */
3383 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3384 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3385 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3387 /* Does not return */
3390 add_acl_headers(US"non-SMTP");
3394 /* The applicable ACLs have been run */
3396 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3397 if (queue_only_policy) queued_by = US"ACL";
3400 #ifdef WITH_CONTENT_SCAN
3404 #ifdef EXPERIMENTAL_DCC
3409 /* The final check on the message is to run the scan_local() function. The
3410 version supplied with Exim always accepts, but this is a hook for sysadmins to
3411 supply their own checking code. The local_scan() function is run even when all
3412 the recipients have been discarded. */
3414 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3416 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3417 deleted, and the incident gets logged. */
3419 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3420 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3421 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3422 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3424 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3425 local_scan_timeout);
3426 local_scan_data = NULL;
3428 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3429 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3430 rc = local_scan(data_fd, &local_scan_data);
3432 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3434 enable_dollar_recipients = FALSE;
3436 store_pool = POOL_MAIN; /* In case changed */
3437 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3440 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3441 os_non_restarting_signal(SIGFPE, SIG_DFL);
3442 os_non_restarting_signal(SIGILL, SIG_DFL);
3443 os_non_restarting_signal(SIGBUS, SIG_DFL);
3445 /* The length check is paranoia against some runaway code, and also because
3446 (for a success return) lines in the spool file are read into big_buffer. */
3448 if (local_scan_data != NULL)
3450 int len = Ustrlen(local_scan_data);
3451 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3452 local_scan_data = string_copyn(local_scan_data, len);
3455 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3457 if (!deliver_freeze) /* ACL might have already frozen */
3459 deliver_freeze = TRUE;
3460 deliver_frozen_at = time(NULL);
3461 frozen_by = US"local_scan()";
3463 rc = LOCAL_SCAN_ACCEPT;
3465 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3467 if (!queue_only_policy) /* ACL might have already queued */
3469 queue_only_policy = TRUE;
3470 queued_by = US"local_scan()";
3472 rc = LOCAL_SCAN_ACCEPT;
3475 /* Message accepted: remove newlines in local_scan_data because otherwise
3476 the spool file gets corrupted. Ensure that all recipients are qualified. */
3478 if (rc == LOCAL_SCAN_ACCEPT)
3480 if (local_scan_data != NULL)
3483 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3485 for (i = 0; i < recipients_count; i++)
3487 recipient_item *r = recipients_list + i;
3488 r->address = rewrite_address_qualify(r->address, TRUE);
3489 if (r->errors_to != NULL)
3490 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3492 if (recipients_count == 0 && blackholed_by == NULL)
3493 blackholed_by = US"local_scan";
3496 /* Message rejected: newlines permitted in local_scan_data to generate
3497 multiline SMTP responses. */
3501 uschar *istemp = US"";
3507 errmsg = local_scan_data;
3509 Uunlink(spool_name); /* Cancel this message */
3513 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3514 "rejection given", rc);
3517 case LOCAL_SCAN_REJECT_NOLOGHDR:
3518 log_extra_selector &= ~LX_rejected_header;
3521 case LOCAL_SCAN_REJECT:
3522 smtp_code = US"550";
3523 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3526 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3527 log_extra_selector &= ~LX_rejected_header;
3530 case LOCAL_SCAN_TEMPREJECT:
3532 smtp_code = US"451";
3533 if (errmsg == NULL) errmsg = US"Temporary local problem";
3534 istemp = US"temporarily ";
3538 s = string_append(s, &size, &sptr, 2, US"F=",
3539 (sender_address[0] == 0)? US"<>" : sender_address);
3540 s = add_host_info_for_log(s, &size, &sptr);
3543 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3544 s, istemp, string_printing(errmsg));
3548 if (!smtp_batched_input)
3550 smtp_respond(smtp_code, 3, TRUE, errmsg);
3551 message_id[0] = 0; /* Indicate no message accepted */
3552 smtp_reply = US""; /* Indicate reply already sent */
3553 goto TIDYUP; /* Skip to end of function */
3557 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3558 /* Does not return */
3563 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3564 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3565 US"message rejected by local scan code: ", error_rc, data_file,
3567 /* Does not return */
3571 /* Reset signal handlers to ignore signals that previously would have caused
3572 the message to be abandoned. */
3574 signal(SIGTERM, SIG_IGN);
3575 signal(SIGINT, SIG_IGN);
3578 /* Ensure the first time flag is set in the newly-received message. */
3580 deliver_firsttime = TRUE;
3582 #ifdef EXPERIMENTAL_BRIGHTMAIL
3584 /* rewind data file */
3585 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3586 bmi_verdicts = bmi_process_message(header_list, data_fd);
3590 /* Update the timstamp in our Received: header to account for any time taken by
3591 an ACL or by local_scan(). The new time is the time that all reception
3592 processing is complete. */
3594 timestamp = expand_string(US"${tod_full}");
3595 tslen = Ustrlen(timestamp);
3597 memcpy(received_header->text + received_header->slen - tslen - 1,
3600 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3604 deliver_freeze = FALSE;
3605 queue_only_policy = FALSE;
3608 /* Keep the data file open until we have written the header file, in order to
3609 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3610 don't write the header file, and we unlink the data file. If writing the header
3611 file fails, we have failed to accept this message. */
3613 if (host_checking || blackholed_by != NULL)
3616 Uunlink(spool_name);
3617 msg_size = 0; /* Compute size for log line */
3618 for (h = header_list; h != NULL; h = h->next)
3619 if (h->type != '*') msg_size += h->slen;
3622 /* Write the -H file */
3626 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3628 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3629 Uunlink(spool_name); /* Lose the data file */
3633 smtp_reply = US"451 Error in writing spool file";
3634 message_id[0] = 0; /* Indicate no message accepted */
3639 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3640 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3642 /* Does not return */
3648 /* The message has now been successfully received. */
3650 receive_messagecount++;
3652 /* In SMTP sessions we may receive several in one connection. After each one,
3653 we wait for the clock to tick at the level of message-id granularity. This is
3654 so that the combination of time+pid is unique, even on systems where the pid
3655 can be re-used within our time interval. We can't shorten the interval without
3656 re-designing the message-id. See comments above where the message id is
3657 created. This is Something For The Future. */
3659 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3660 exim_wait_tick(&message_id_tv, id_resolution);
3662 /* Add data size to written header size. We do not count the initial file name
3663 that is in the file, but we do add one extra for the notional blank line that
3664 precedes the data. This total differs from message_size in that it include the
3665 added Received: header and any other headers that got created locally. */
3668 fstat(data_fd, &statbuf);
3670 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3672 /* Generate a "message received" log entry. We do this by building up a dynamic
3673 string as required. Since we commonly want to add two items at a time, use a
3674 macro to simplify the coding. We log the arrival of a new message while the
3675 file is still locked, just in case the machine is *really* fast, and delivers
3676 it first! Include any message id that is in the message - since the syntax of a
3677 message id is actually an addr-spec, we can use the parse routine to canonicize
3682 s = store_get(size);
3684 s = string_append(s, &size, &sptr, 2, US"<= ",
3685 (sender_address[0] == 0)? US"<>" : sender_address);
3686 if (message_reference != NULL)
3687 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3689 s = add_host_info_for_log(s, &size, &sptr);
3692 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_in.cipher != NULL)
3693 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3694 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3695 tls_in.cipher != NULL)
3696 s = string_append(s, &size, &sptr, 2, US" CV=",
3697 tls_in.certificate_verified? "yes":"no");
3698 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_in.peerdn != NULL)
3699 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3700 string_printing(tls_in.peerdn), US"\"");
3701 if ((log_extra_selector & LX_tls_sni) != 0 && tls_in.sni != NULL)
3702 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3703 string_printing(tls_in.sni), US"\"");
3706 if (sender_host_authenticated != NULL)
3708 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3709 if (authenticated_id != NULL)
3711 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3712 if (log_extra_selector & LX_smtp_mailauth && authenticated_sender != NULL)
3713 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3717 #ifdef EXPERIMENTAL_PRDR
3719 s = string_append(s, &size, &sptr, 1, US" PRDR");
3722 sprintf(CS big_buffer, "%d", msg_size);
3723 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3725 /* log 8BITMIME mode announced in MAIL_FROM
3729 if (log_extra_selector & LX_8bitmime)
3731 sprintf(CS big_buffer, "%d", body_8bitmime);
3732 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3735 /* If an addr-spec in a message-id contains a quoted string, it can contain
3736 any characters except " \ and CR and so in particular it can contain NL!
3737 Therefore, make sure we use a printing-characters only version for the log.
3738 Also, allow for domain literals in the message id. */
3740 if (msgid_header != NULL)
3743 BOOL save_allow_domain_literals = allow_domain_literals;
3744 allow_domain_literals = TRUE;
3745 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3746 &errmsg, &start, &end, &domain, FALSE);
3747 allow_domain_literals = save_allow_domain_literals;
3749 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3752 /* If subject logging is turned on, create suitable printing-character
3753 text. By expanding $h_subject: we make use of the MIME decoding. */
3755 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3758 uschar *p = big_buffer;
3759 uschar *ss = expand_string(US"$h_subject:");
3761 /* Backslash-quote any double quotes or backslashes so as to make a
3762 a C-like string, and turn any non-printers into escape sequences. */
3765 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3767 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3772 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3775 /* Terminate the string: string_cat() and string_append() leave room, but do
3776 not put the zero in. */
3780 /* Create a message log file if message logs are being used and this message is
3781 not blackholed. Write the reception stuff to it. We used to leave message log
3782 creation until the first delivery, but this has proved confusing for some
3785 if (message_logs && blackholed_by == NULL)
3789 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3791 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3793 if (fd < 0 && errno == ENOENT)
3796 sprintf(CS temp, "msglog/%s", message_subdir);
3797 if (message_subdir[0] == 0) temp[6] = 0;
3798 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3799 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3804 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3805 spool_name, strerror(errno));
3810 FILE *message_log = fdopen(fd, "a");
3811 if (message_log == NULL)
3813 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3814 spool_name, strerror(errno));
3819 uschar *now = tod_stamp(tod_log);
3820 fprintf(message_log, "%s Received from %s\n", now, s+3);
3821 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3823 if (queue_only_policy) fprintf(message_log,
3824 "%s no immediate delivery: queued by %s\n", now, queued_by);
3825 (void)fclose(message_log);
3830 /* Everything has now been done for a successful message except logging its
3831 arrival, and outputting an SMTP response. While writing to the log, set a flag
3832 to cause a call to receive_bomb_out() if the log cannot be opened. */
3834 receive_call_bombout = TRUE;
3836 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3837 connection has gone away. This can only be done if there is no unconsumed input
3838 waiting in the local input buffer. We can test for this by calling
3839 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3840 input to be sent following the final dot, so the presence of following input is
3843 If the connection is still present, but there is no unread input for the
3844 socket, the result of a select() call will be zero. If, however, the connection
3845 has gone away, or if there is pending input, the result of select() will be
3846 non-zero. The two cases can be distinguished by trying to read the next input
3847 character. If we succeed, we can unread it so that it remains in the local
3848 buffer for handling later. If not, the connection has been lost.
3850 Of course, since TCP/IP is asynchronous, there is always a chance that the
3851 connection will vanish between the time of this test and the sending of the
3852 response, but the chance of this happening should be small. */
3854 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3855 !receive_smtp_buffered())
3858 fd_set select_check;
3859 FD_ZERO(&select_check);
3860 FD_SET(fileno(smtp_in), &select_check);
3864 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3866 int c = (receive_getc)();
3867 if (c != EOF) (receive_ungetc)(c); else
3869 uschar *msg = US"SMTP connection lost after final dot";
3870 smtp_reply = US""; /* No attempt to send a response */
3871 smtp_yield = FALSE; /* Nothing more on this connection */
3873 /* Re-use the log line workspace */
3876 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3877 s = add_host_info_for_log(s, &size, &sptr);
3879 log_write(0, LOG_MAIN, "%s", s);
3881 /* Delete the files for this aborted message. */
3883 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3884 message_subdir, message_id);
3885 Uunlink(spool_name);
3887 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3888 message_subdir, message_id);
3889 Uunlink(spool_name);
3891 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3892 message_subdir, message_id);
3893 Uunlink(spool_name);
3900 /* The connection has not gone away; we really are going to take responsibility
3901 for this message. */
3903 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
3906 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
3907 the sender's dot (below).
3908 If rejected: copy response to sender, wipe the spooled files, log approriately.
3909 If temp-reject: accept to sender, keep the spooled files.
3911 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3913 XXX We do not handle queue-only, freezing, or blackholes.
3915 cutthrough_done = 0;
3916 if(cutthrough_fd >= 0)
3918 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the messsage */
3919 /* Logging was done in finaldot() */
3922 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3923 cutthrough_done = 3;
3924 break; /* message_id needed for SMTP accept below */
3926 default: /* Unknown response, or error. Treat as temp-reject. */
3927 case '4': /* Temp-reject. Keep spoolfiles and accept. */
3928 cutthrough_done = 1; /* Avoid the usual immediate delivery attempt */
3929 break; /* message_id needed for SMTP accept below */
3931 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
3932 smtp_reply= msg; /* Pass on the exact error */
3933 cutthrough_done = 2;
3938 if(smtp_reply == NULL
3939 #ifdef EXPERIMENTAL_PRDR
3944 log_write(0, LOG_MAIN |
3945 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3946 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3949 /* Log any control actions taken by an ACL or local_scan(). */
3951 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3952 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3953 "no immediate delivery: queued by %s", queued_by);
3955 receive_call_bombout = FALSE;
3957 store_reset(s); /* The store for the main log message can be reused */
3959 /* If the message is frozen, and freeze_tell is set, do the telling. */
3961 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3963 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3964 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3965 message_id, frozen_by, sender_address);
3969 /* Either a message has been successfully received and written to the two spool
3970 files, or an error in writing the spool has occurred for an SMTP message, or
3971 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
3972 we will have already given up because there's no point in carrying on!) In
3973 either event, we must now close (and thereby unlock) the data file. In the
3974 successful case, this leaves the message on the spool, ready for delivery. In
3975 the error case, the spool file will be deleted. Then tidy up store, interact
3976 with an SMTP call if necessary, and return.
3978 A fflush() was done earlier in the expectation that any write errors on the
3979 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3980 possible for fclose() to fail - but what to do? What has happened to the lock
3985 process_info[process_info_len] = 0; /* Remove message id */
3986 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
3988 /* Now reset signal handlers to their defaults */
3990 signal(SIGTERM, SIG_DFL);
3991 signal(SIGINT, SIG_DFL);
3993 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3994 value, which defaults TRUE - meaning there may be more incoming messages from
3995 this connection. For non-SMTP callers (where there is only ever one message),
3996 the default is FALSE. */
4002 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4003 is set to the response that should be sent. When it is NULL, we generate
4004 default responses. After an ACL error or local_scan() error, the response has
4005 already been sent, and smtp_reply is an empty string to indicate this. */
4007 if (!smtp_batched_input)
4009 if (smtp_reply == NULL)
4011 if (fake_response != OK)
4012 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4013 fake_response_text);
4015 /* An OK response is required; use "message" text if present. */
4017 else if (user_msg != NULL)
4019 uschar *code = US"250";
4021 smtp_message_code(&code, &len, &user_msg, NULL);
4022 smtp_respond(code, len, TRUE, user_msg);
4025 /* Default OK response */
4028 smtp_printf("250 OK id=%s\r\n", message_id);
4031 "\n**** SMTP testing: that is not a real message id!\n\n");
4034 /* smtp_reply is set non-empty */
4036 else if (smtp_reply[0] != 0)
4038 if (fake_response != OK && (smtp_reply[0] == '2'))
4039 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4040 fake_response_text);
4042 smtp_printf("%.1024s\r\n", smtp_reply);
4045 switch (cutthrough_done)
4047 case 3: log_write(0, LOG_MAIN, "Completed"); /* Delivery was done */
4048 case 2: { /* Delete spool files */
4049 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
4050 message_subdir, message_id);
4051 Uunlink(spool_name);
4052 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
4053 message_subdir, message_id);
4054 Uunlink(spool_name);
4055 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
4056 message_subdir, message_id);
4057 Uunlink(spool_name);
4059 case 1: message_id[0] = 0; /* Prevent a delivery from starting */
4062 cutthrough_delivery = FALSE;
4065 /* For batched SMTP, generate an error message on failure, and do
4066 nothing on success. The function moan_smtp_batch() does not return -
4067 it exits from the program with a non-zero return code. */
4069 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
4073 /* If blackholing, we can immediately log this message's sad fate. The data
4074 file has already been unlinked, and the header file was never written to disk.
4075 We must now indicate that nothing was received, to prevent a delivery from
4078 if (blackholed_by != NULL)
4080 uschar *detail = (local_scan_data != NULL)?
4081 string_printing(local_scan_data) :
4082 string_sprintf("(%s discarded recipients)", blackholed_by);
4083 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4084 log_write(0, LOG_MAIN, "Completed");
4088 /* Reset headers so that logging of rejects for a subsequent message doesn't
4089 include them. It is also important to set header_last = NULL before exiting
4090 from this function, as this prevents certain rewrites that might happen during
4091 subsequent verifying (of another incoming message) from trying to add headers
4092 when they shouldn't. */
4094 header_list = header_last = NULL;
4096 return yield; /* TRUE if more messages (SMTP only) */
4099 /* End of receive.c */