1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
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 #ifdef EXPERIMENTAL_DMARC
18 #endif /* EXPERIMENTAL_DMARC */
20 /*************************************************
21 * Local static variables *
22 *************************************************/
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar spool_name[256];
30 /*************************************************
31 * Non-SMTP character reading functions *
32 *************************************************/
34 /* These are the default functions that are set up in the variables such as
35 receive_getc initially. They just call the standard functions, passing stdin as
36 the file. (When SMTP input is occurring, different functions are used by
37 changing the pointer variables.) */
48 return ungetc(c, stdin);
66 /*************************************************
67 * Check that a set sender is allowed *
68 *************************************************/
70 /* This function is called when a local caller sets an explicit sender address.
71 It checks whether this is permitted, which it is for trusted callers.
72 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74 Arguments: the proposed sender address
75 Returns: TRUE for a trusted caller
76 TRUE if the address has been set, untrusted_set_sender has been
77 set, and the address matches something in the list
82 receive_check_set_sender(uschar *newsender)
85 if (trusted_caller) return TRUE;
86 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
87 qnewsender = (Ustrchr(newsender, '@') != NULL)?
88 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
97 /*************************************************
98 * Read space info for a partition *
99 *************************************************/
101 /* This function is called by receive_check_fs() below, and also by string
102 expansion for variables such as $spool_space. The field names for the statvfs
103 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
104 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
105 have inodes, and they return -1 for the number available.
107 Later: It turns out that some file systems that do not have the concept of
108 inodes return 0 rather than -1. Such systems should also return 0 for the total
109 number of inodes, so we require that to be greater than zero before returning
113 isspool TRUE for spool partition, FALSE for log partition
114 inodeptr address of int to receive inode count; -1 if there isn't one
116 Returns: available on-root space, in kilobytes
117 -1 for log partition if there isn't one
119 All values are -1 if the STATFS functions are not available.
123 receive_statvfs(BOOL isspool, int *inodeptr)
126 struct STATVFS statbuf;
131 /* The spool directory must always exist. */
135 path = spool_directory;
139 /* Need to cut down the log file path to the directory, and to ignore any
140 appearance of "syslog" in it. */
144 int sep = ':'; /* Not variable - outside scripts use */
145 uschar *p = log_file_path;
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
151 if (*p == 0) p = US":";
152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
154 if (Ustrcmp(path, "syslog") != 0) break;
157 if (path == NULL) /* No log files */
163 /* An empty string means use the default, which is in the spool directory.
164 But don't just use the spool directory, as it is possible that the log
165 subdirectory has been symbolically linked elsewhere. */
169 sprintf(CS buffer, CS"%s/log", CS spool_directory);
175 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
179 /* We now have the path; do the business */
181 memset(&statbuf, 0, sizeof(statbuf));
183 if (STATVFS(CS path, &statbuf) != 0)
185 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
186 "%s directory %s: %s", name, spool_directory, strerror(errno));
187 smtp_closedown(US"spool or log directory problem");
188 exim_exit(EXIT_FAILURE);
191 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
193 /* Disks are getting huge. Take care with computing the size in kilobytes. */
195 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
197 /* Unable to find partition sizes in this environment. */
208 /*************************************************
209 * Check space on spool and log partitions *
210 *************************************************/
212 /* This function is called before accepting a message; if any thresholds are
213 set, it checks them. If a message_size is supplied, it checks that there is
214 enough space for that size plus the threshold - i.e. that the message won't
215 reduce the space to the threshold. Not all OS have statvfs(); for those that
216 don't, this function always returns TRUE. For some OS the old function and
217 struct name statfs is used; that is handled by a macro, defined in exim.h.
220 msg_size the (estimated) size of an incoming message
222 Returns: FALSE if there isn't enough space, or if the information cannot
224 TRUE if no check was done or there is enough space
228 receive_check_fs(int msg_size)
232 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
234 space = receive_statvfs(TRUE, &inodes);
237 debug_printf("spool directory space = %dK inodes = %d "
238 "check_space = %dK inodes = %d msg_size = %d\n",
239 space, inodes, check_spool_space, check_spool_inodes, msg_size);
241 if ((space >= 0 && space < check_spool_space) ||
242 (inodes >= 0 && inodes < check_spool_inodes))
244 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
245 "inodes=%d", space, inodes);
250 if (check_log_space > 0 || check_log_inodes > 0)
252 space = receive_statvfs(FALSE, &inodes);
255 debug_printf("log directory space = %dK inodes = %d "
256 "check_space = %dK inodes = %d\n",
257 space, inodes, check_log_space, check_log_inodes);
259 if ((space >= 0 && space < check_log_space) ||
260 (inodes >= 0 && inodes < check_log_inodes))
262 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
263 "inodes=%d", space, inodes);
273 /*************************************************
274 * Bomb out while reading a message *
275 *************************************************/
277 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
278 received, or if there is a timeout. A rarer case might be if the log files are
279 screwed up and Exim can't open them to record a message's arrival. Handling
280 that case is done by setting a flag to cause the log functions to call this
281 function if there is an ultimate disaster. That is why it is globally
285 reason text reason to pass to the not-quit ACL
286 msg default SMTP response to give if in an SMTP session
291 receive_bomb_out(uschar *reason, uschar *msg)
293 static BOOL already_bombing_out;
294 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
295 timeouts, if someone has something slow in their quit ACL. Since the only
296 things we should be doing are to close down cleanly ASAP, on the second
297 pass we also close down stuff that might be opened again, before bypassing
298 the ACL call and exiting. */
300 /* If spool_name is set, it contains the name of the data file that is being
301 written. Unlink it before closing so that it cannot be picked up by a delivery
302 process. Ensure that any header file is also removed. */
304 if (spool_name[0] != '\0')
307 spool_name[Ustrlen(spool_name) - 1] = 'H';
309 spool_name[0] = '\0';
312 /* Now close the file if it is open, either as a fd or a stream. */
314 if (data_file != NULL)
316 (void)fclose(data_file);
318 } else if (data_fd >= 0) {
319 (void)close(data_fd);
323 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
324 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
327 if (!already_bombing_out)
329 already_bombing_out = TRUE;
332 if (smtp_batched_input)
333 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
334 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
335 smtp_active_hostname, msg);
339 /* Exit from the program (non-BSMTP cases) */
341 exim_exit(EXIT_FAILURE);
345 /*************************************************
346 * Data read timeout *
347 *************************************************/
349 /* Handler function for timeouts that occur while reading the data that
352 Argument: the signal number
357 data_timeout_handler(int sig)
361 sig = sig; /* Keep picky compilers happy */
365 msg = US"SMTP incoming data timeout";
366 log_write(L_lost_incoming_connection,
367 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
369 (sender_fullhost != NULL)? sender_fullhost : US"local process",
374 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
375 log_write(L_lost_incoming_connection,
376 LOG_MAIN, "timed out while reading local message");
379 receive_bomb_out(US"data-timeout", msg); /* Does not return */
384 /*************************************************
385 * local_scan() timeout *
386 *************************************************/
388 /* Handler function for timeouts that occur while running a local_scan()
391 Argument: the signal number
396 local_scan_timeout_handler(int sig)
398 sig = sig; /* Keep picky compilers happy */
399 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
400 "message temporarily rejected (size %d)", message_size);
401 /* Does not return */
402 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
407 /*************************************************
408 * local_scan() crashed *
409 *************************************************/
411 /* Handler function for signals that occur while running a local_scan()
414 Argument: the signal number
419 local_scan_crash_handler(int sig)
421 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
422 "signal %d - message temporarily rejected (size %d)", sig, message_size);
423 /* Does not return */
424 receive_bomb_out(US"local-scan-error", US"local verification problem");
428 /*************************************************
429 * SIGTERM or SIGINT received *
430 *************************************************/
432 /* Handler for SIGTERM or SIGINT signals that occur while reading the
433 data that comprises a message.
435 Argument: the signal number
440 data_sigterm_sigint_handler(int sig)
446 msg = US"Service not available - SIGTERM or SIGINT received";
447 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
448 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
452 if (filter_test == FTEST_NONE)
454 fprintf(stderr, "\nexim: %s received - message abandoned\n",
455 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
456 log_write(0, LOG_MAIN, "%s received while reading local message",
457 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
461 receive_bomb_out(US"signal-exit", msg); /* Does not return */
466 /*************************************************
467 * Add new recipient to list *
468 *************************************************/
470 /* This function builds a list of recipient addresses in argc/argv
474 recipient the next address to add to recipients_list
475 pno parent number for fixed aliases; -1 otherwise
481 receive_add_recipient(uschar *recipient, int pno)
483 if (recipients_count >= recipients_list_max)
485 recipient_item *oldlist = recipients_list;
486 int oldmax = recipients_list_max;
487 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
488 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
490 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
493 recipients_list[recipients_count].address = recipient;
494 recipients_list[recipients_count].pno = pno;
495 #ifdef EXPERIMENTAL_BRIGHTMAIL
496 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
497 /* reset optin string pointer for next recipient */
498 bmi_current_optin = NULL;
500 recipients_list[recipients_count].orcpt = NULL;
501 recipients_list[recipients_count].dsn_flags = 0;
502 recipients_list[recipients_count++].errors_to = NULL;
508 /*************************************************
509 * Send user response message *
510 *************************************************/
512 /* This function is passed a default response code and a user message. It calls
513 smtp_message_code() to check and possibly modify the response code, and then
514 calls smtp_respond() to transmit the response. I put this into a function
515 just to avoid a lot of repetition.
518 code the response code
519 user_msg the user message
526 smtp_user_msg(uschar *code, uschar *user_msg)
529 smtp_message_code(&code, &len, &user_msg, NULL);
530 smtp_respond(code, len, TRUE, user_msg);
538 /*************************************************
539 * Remove a recipient from the list *
540 *************************************************/
542 /* This function is provided for local_scan() to use.
545 recipient address to remove
547 Returns: TRUE if it did remove something; FALSE otherwise
551 receive_remove_recipient(uschar *recipient)
554 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
556 for (count = 0; count < recipients_count; count++)
558 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
560 if ((--recipients_count - count) > 0)
561 memmove(recipients_list + count, recipients_list + count + 1,
562 (recipients_count - count)*sizeof(recipient_item));
573 /*************************************************
574 * Read data portion of a non-SMTP message *
575 *************************************************/
577 /* This function is called to read the remainder of a message (following the
578 header) when the input is not from SMTP - we are receiving a local message on
579 a standard input stream. The message is always terminated by EOF, and is also
580 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
581 two cases for maximum efficiency.
583 Ensure that the body ends with a newline. This will naturally be the case when
584 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
585 as "sequences of lines" - this of course strictly applies only to SMTP, but
586 deliveries into BSD-type mailbox files also require it. Exim used to have a
587 flag for doing this at delivery time, but as it was always set for all
588 transports, I decided to simplify things by putting the check here instead.
590 There is at least one MUA (dtmail) that sends CRLF via this interface, and
591 other programs are known to do this as well. Exim used to have a option for
592 dealing with this: in July 2003, after much discussion, the code has been
593 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
595 However, for the case when a dot on a line by itself terminates a message, the
596 only recognized terminating sequences before and after the dot are LF and CRLF.
597 Otherwise, having read EOL . CR, you don't know whether to read another
600 Internally, in messages stored in Exim's spool files, LF is used as the line
601 terminator. Under the new regime, bare CRs will no longer appear in these
605 fout a FILE to which to write the message
607 Returns: One of the END_xxx values indicating why it stopped reading
611 read_message_data(FILE *fout)
615 register int linelength = 0;
617 /* Handle the case when only EOF terminates the message */
621 register int last_ch = '\n';
623 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
625 if (ch == 0) body_zerocount++;
626 if (last_ch == '\r' && ch != '\n')
628 if (linelength > max_received_linelength)
629 max_received_linelength = linelength;
631 if (fputc('\n', fout) == EOF) return END_WERROR;
635 if (ch == '\r') continue;
637 if (fputc(ch, fout) == EOF) return END_WERROR;
640 if (linelength > max_received_linelength)
641 max_received_linelength = linelength;
646 if (++message_size > thismessage_size_limit) return END_SIZE;
651 if (linelength > max_received_linelength)
652 max_received_linelength = linelength;
653 if (fputc('\n', fout) == EOF) return END_WERROR;
661 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
665 while ((ch = (receive_getc)()) != EOF)
667 if (ch == 0) body_zerocount++;
670 case 0: /* Normal state (previous char written) */
674 if (linelength > max_received_linelength)
675 max_received_linelength = linelength;
680 { ch_state = 2; continue; }
683 case 1: /* After written "\n" */
684 if (ch == '.') { ch_state = 3; continue; }
685 if (ch == '\r') { ch_state = 2; continue; }
686 if (ch != '\n') ch_state = 0; else linelength = -1;
690 body_linecount++; /* After unwritten "\r" */
691 if (linelength > max_received_linelength)
692 max_received_linelength = linelength;
700 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
701 if (ch == '\r') continue;
707 case 3: /* After "\n." (\n written, dot not) */
708 if (ch == '\n') return END_DOT;
709 if (ch == '\r') { ch_state = 4; continue; }
712 if (fputc('.', fout) == EOF) return END_WERROR;
716 case 4: /* After "\n.\r" (\n written, rest not) */
717 if (ch == '\n') return END_DOT;
720 if (fputs(".\n", fout) == EOF) return END_WERROR;
721 if (ch == '\r') { ch_state = 2; continue; }
727 if (fputc(ch, fout) == EOF) return END_WERROR;
728 if (++message_size > thismessage_size_limit) return END_SIZE;
731 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
732 the message ends with a newline, and we must also write any characters that
733 were saved up while testing for an ending dot. */
737 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
738 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
739 message_size += Ustrlen(ends[ch_state]);
749 /*************************************************
750 * Read data portion of an SMTP message *
751 *************************************************/
753 /* This function is called to read the remainder of an SMTP message (after the
754 headers), or to skip over it when an error has occurred. In this case, the
755 output file is passed as NULL.
757 If any line begins with a dot, that character is skipped. The input should only
758 be successfully terminated by CR LF . CR LF unless it is local (non-network)
759 SMTP, in which case the CRs are optional, but...
761 FUDGE: It seems that sites on the net send out messages with just LF
762 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
763 we make the CRs optional in all cases.
765 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
766 well, so that there are no CRs in spooled messages. However, the message
767 terminating dot is not recognized between two bare CRs.
770 fout a FILE to which to write the message; NULL if skipping
772 Returns: One of the END_xxx values indicating why it stopped reading
776 read_message_data_smtp(FILE *fout)
780 register int linelength = 0;
782 while ((ch = (receive_getc)()) != EOF)
784 if (ch == 0) body_zerocount++;
787 case 0: /* After LF or CRLF */
791 continue; /* Don't ever write . after LF */
795 /* Else fall through to handle as normal uschar. */
797 case 1: /* Normal state */
802 if (linelength > max_received_linelength)
803 max_received_linelength = linelength;
813 case 2: /* After (unwritten) CR */
815 if (linelength > max_received_linelength)
816 max_received_linelength = linelength;
825 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
826 (void) cutthrough_put_nl();
827 if (ch != '\r') ch_state = 1; else continue;
831 case 3: /* After [CR] LF . */
839 ch_state = 1; /* The dot itself is removed */
842 case 4: /* After [CR] LF . CR */
843 if (ch == '\n') return END_DOT;
846 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
847 (void) cutthrough_put_nl();
857 /* Add the character to the spool file, unless skipping; then loop for the
864 if (fputc(ch, fout) == EOF) return END_WERROR;
865 if (message_size > thismessage_size_limit) return END_SIZE;
868 (void) cutthrough_put_nl();
872 (void) cutthrough_puts(&c, 1);
876 /* Fall through here if EOF encountered. This indicates some kind of error,
877 since a correct message is terminated by [CR] LF . [CR] LF. */
885 /*************************************************
886 * Swallow SMTP message *
887 *************************************************/
889 /* This function is called when there has been some kind of error while reading
890 an SMTP message, and the remaining data may need to be swallowed. It is global
891 because it is called from smtp_closedown() to shut down an incoming call
894 Argument: a FILE from which to read the message
899 receive_swallow_smtp(void)
901 if (message_ended >= END_NOTENDED)
902 message_ended = read_message_data_smtp(NULL);
907 /*************************************************
908 * Handle lost SMTP connection *
909 *************************************************/
911 /* This function logs connection loss incidents and generates an appropriate
914 Argument: additional data for the message
915 Returns: the SMTP response
919 handle_lost_connection(uschar *s)
921 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
922 "%s lost while reading message data%s", smtp_get_connection_info(), s);
923 return US"421 Lost incoming connection";
929 /*************************************************
930 * Handle a non-smtp reception error *
931 *************************************************/
933 /* This function is called for various errors during the reception of non-SMTP
934 messages. It either sends a message to the sender of the problem message, or it
935 writes to the standard error stream.
938 errcode code for moan_to_sender(), identifying the error
939 text1 first message text, passed to moan_to_sender()
940 text2 second message text, used only for stderrr
941 error_rc code to pass to exim_exit if no problem
942 f FILE containing body of message (may be stdin)
943 hptr pointer to instore headers or NULL
945 Returns: calls exim_exit(), which does not return
949 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
950 FILE *f, header_line *hptr)
952 if (error_handling == ERRORS_SENDER)
956 eblock.text1 = text1;
957 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
958 error_rc = EXIT_FAILURE;
960 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
967 /*************************************************
968 * Add header lines set up by ACL *
969 *************************************************/
971 /* This function is called to add the header lines that were set up by
972 statements in an ACL to the list of headers in memory. It is done in two stages
973 like this, because when the ACL for RCPT is running, the other headers have not
974 yet been received. This function is called twice; once just before running the
975 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
976 are visible to the DATA ACL.
978 Originally these header lines were added at the end. Now there is support for
979 three different places: top, bottom, and after the Received: header(s). There
980 will always be at least one Received: header, even if it is marked deleted, and
981 even if something else has been put in front of it.
984 acl_name text to identify which ACL
990 add_acl_headers(int where, uschar *acl_name)
992 header_line *h, *next;
993 header_line *last_received = NULL;
1000 if (cutthrough_fd >= 0 && (acl_removed_headers || acl_added_headers))
1002 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1003 " will not take effect on cutthrough deliveries");
1008 if (acl_removed_headers != NULL)
1010 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1012 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1014 uschar * list = acl_removed_headers;
1015 int sep = ':'; /* This is specified as a colon-separated list */
1019 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1020 if (header_testname(h, s, Ustrlen(s), FALSE))
1022 h->type = htype_old;
1023 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1026 acl_removed_headers = NULL;
1027 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1030 if (acl_added_headers == NULL) return;
1031 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1033 for (h = acl_added_headers; h != NULL; h = next)
1040 h->next = header_list;
1042 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1046 if (last_received == NULL)
1048 last_received = header_list;
1049 while (!header_testname(last_received, US"Received", 8, FALSE))
1050 last_received = last_received->next;
1051 while (last_received->next != NULL &&
1052 header_testname(last_received->next, US"Received", 8, FALSE))
1053 last_received = last_received->next;
1055 h->next = last_received->next;
1056 last_received->next = h;
1057 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1061 /* add header before any header which is NOT Received: or Resent- */
1062 last_received = header_list;
1063 while ( (last_received->next != NULL) &&
1064 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1065 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1066 last_received = last_received->next;
1067 /* last_received now points to the last Received: or Resent-* header
1068 in an uninterrupted chain of those header types (seen from the beginning
1069 of all headers. Our current header must follow it. */
1070 h->next = last_received->next;
1071 last_received->next = h;
1072 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1077 header_last->next = h;
1081 if (h->next == NULL) header_last = h;
1083 /* Check for one of the known header types (From:, To:, etc.) though in
1084 practice most added headers are going to be "other". Lower case
1085 identification letters are never stored with the header; they are used
1086 for existence tests when messages are received. So discard any lower case
1089 h->type = header_checkname(h, FALSE);
1090 if (h->type >= 'a') h->type = htype_other;
1092 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1095 acl_added_headers = NULL;
1096 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1101 /*************************************************
1102 * Add host information for log line *
1103 *************************************************/
1105 /* Called for acceptance and rejecting log lines. This adds information about
1106 the calling host to a string that is being built dynamically.
1109 s the dynamic string
1110 sizeptr points to the size variable
1111 ptrptr points to the pointer variable
1113 Returns: the extended string
1117 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1119 if (sender_fullhost != NULL)
1121 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1122 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1123 interface_address != NULL)
1125 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1127 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1130 if (sender_ident != NULL)
1131 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1132 if (received_protocol != NULL)
1133 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1139 #ifdef WITH_CONTENT_SCAN
1141 /*************************************************
1142 * Run the MIME ACL on a message *
1143 *************************************************/
1145 /* This code is in a subroutine so that it can be used for both SMTP
1146 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1149 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1150 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1151 smtp_reply_ptr Where SMTP reply is being built
1152 blackholed_by_ptr Where "blackholed by" message is being built
1154 Returns: TRUE to carry on; FALSE to abandon the message
1158 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1159 uschar **blackholed_by_ptr)
1162 uschar rfc822_file_path[2048];
1163 unsigned long mbox_size;
1164 header_line *my_headerlist;
1165 uschar *user_msg, *log_msg;
1166 int mime_part_count_buffer = -1;
1169 memset(CS rfc822_file_path,0,2048);
1171 /* check if it is a MIME message */
1172 my_headerlist = header_list;
1173 while (my_headerlist != NULL)
1175 /* skip deleted headers */
1176 if (my_headerlist->type == '*')
1178 my_headerlist = my_headerlist->next;
1181 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1183 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1186 my_headerlist = my_headerlist->next;
1189 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1193 /* make sure the eml mbox file is spooled up */
1194 mbox_file = spool_mbox(&mbox_size, NULL);
1195 if (mbox_file == NULL) {
1196 /* error while spooling */
1197 log_write(0, LOG_MAIN|LOG_PANIC,
1198 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1199 Uunlink(spool_name);
1201 #ifdef EXPERIMENTAL_DCC
1204 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1205 message_id[0] = 0; /* Indicate no message accepted */
1206 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1207 return FALSE; /* Indicate skip to end of receive function */
1213 mime_part_count = -1;
1214 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1215 (void)fclose(mbox_file);
1217 if (Ustrlen(rfc822_file_path) > 0)
1219 mime_part_count = mime_part_count_buffer;
1221 if (unlink(CS rfc822_file_path) == -1)
1223 log_write(0, LOG_PANIC,
1224 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1229 /* check if we must check any message/rfc822 attachments */
1232 uschar temp_path[1024];
1233 struct dirent * entry;
1236 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1237 spool_directory, message_id);
1239 tempdir = opendir(CS temp_path);
1242 if (!(entry = readdir(tempdir)))
1244 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1246 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1247 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1248 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1257 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1259 /* set RFC822 expansion variable */
1261 mime_part_count_buffer = mime_part_count;
1262 goto MIME_ACL_CHECK;
1264 log_write(0, LOG_PANIC,
1265 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1266 unlink(CS rfc822_file_path);
1271 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1274 recipients_count = 0;
1275 *blackholed_by_ptr = US"MIME ACL";
1279 Uunlink(spool_name);
1281 #ifdef EXPERIMENTAL_DCC
1284 if (smtp_input && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0) {
1285 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1286 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1288 message_id[0] = 0; /* Indicate no message accepted */
1289 return FALSE; /* Cause skip to end of receive function */
1295 #endif /* WITH_CONTENT_SCAN */
1300 received_header_gen(void)
1304 header_line *received_header= header_list;
1306 timestamp = expand_string(US"${tod_full}");
1307 if (recipients_count == 1) received_for = recipients_list[0].address;
1308 received = expand_string(received_header_text);
1309 received_for = NULL;
1311 if (received == NULL)
1313 if(spool_name[0] != 0)
1314 Uunlink(spool_name); /* Lose the data file */
1315 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1316 "(received_header_text) failed: %s", string_printing(received_header_text),
1317 expand_string_message);
1320 /* The first element on the header chain is reserved for the Received header,
1321 so all we have to do is fill in the text pointer, and set the type. However, if
1322 the result of the expansion is an empty string, we leave the header marked as
1323 "old" so as to refrain from adding a Received header. */
1325 if (received[0] == 0)
1327 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1328 received_header->type = htype_old;
1332 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1333 received_header->type = htype_received;
1336 received_header->slen = Ustrlen(received_header->text);
1338 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1339 received_header->type, received_header->text);
1344 /*************************************************
1346 *************************************************/
1348 /* Receive a message on the given input, and put it into a pair of spool files.
1349 Either a non-null list of recipients, or the extract flag will be true, or
1350 both. The flag sender_local is true for locally generated messages. The flag
1351 submission_mode is true if an ACL has obeyed "control = submission". The flag
1352 suppress_local_fixups is true if an ACL has obeyed "control =
1353 suppress_local_fixups" or -G was passed on the command-line.
1354 The flag smtp_input is true if the message is to be
1355 handled using SMTP conventions about termination and lines starting with dots.
1356 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1358 If a message was successfully read, message_id[0] will be non-zero.
1360 The general actions of this function are:
1362 . Read the headers of the message (if any) into a chain of store
1365 . If there is a "sender:" header and the message is locally originated,
1366 throw it away, unless the caller is trusted, or unless
1367 active_local_sender_retain is set - which can only happen if
1368 active_local_from_check is false.
1370 . If recipients are to be extracted from the message, build the
1371 recipients list from the headers, removing any that were on the
1372 original recipients list (unless extract_addresses_remove_arguments is
1373 false), and at the same time, remove any bcc header that may be present.
1375 . Get the spool file for the data, sort out its unique name, open
1376 and lock it (but don't give it the name yet).
1378 . Generate a "Message-Id" header if the message doesn't have one, for
1379 locally-originated messages.
1381 . Generate a "Received" header.
1383 . Ensure the recipients list is fully qualified and rewritten if necessary.
1385 . If there are any rewriting rules, apply them to the sender address
1386 and also to the headers.
1388 . If there is no from: header, generate one, for locally-generated messages
1389 and messages in "submission mode" only.
1391 . If the sender is local, check that from: is correct, and if not, generate
1392 a Sender: header, unless message comes from a trusted caller, or this
1393 feature is disabled by active_local_from_check being false.
1395 . If there is no "date" header, generate one, for locally-originated
1396 or submission mode messages only.
1398 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1399 dot_ends mode, to the data file. Leave it open, to hold the lock.
1401 . Write the envelope and the headers to a new file.
1403 . Set the name for the header file; close it.
1405 . Set the name for the data file; close it.
1407 Because this function can potentially be called many times in a single
1408 SMTP connection, all store should be got by store_get(), so that it will be
1409 automatically retrieved after the message is accepted.
1411 FUDGE: It seems that sites on the net send out messages with just LF
1412 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1413 we make the CRs optional in all cases.
1415 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1416 new regime is now in place in which bare CRs in header lines are turned into LF
1417 followed by a space, so as not to terminate the header line.
1419 February 2004: A bare LF in a header line in a message whose first line was
1420 terminated by CRLF is treated in the same way as a bare CR.
1423 extract_recip TRUE if recipients are to be extracted from the message's
1426 Returns: TRUE there are more messages to be read (SMTP input)
1427 FALSE there are no more messages to be read (non-SMTP input
1428 or SMTP connection collapsed, or other failure)
1430 When reading a message for filter testing, the returned value indicates
1431 whether the headers (which is all that is read) were terminated by '.' or
1435 receive_msg(BOOL extract_recip)
1440 int process_info_len = Ustrlen(process_info);
1441 int error_rc = (error_handling == ERRORS_SENDER)?
1442 errors_sender_rc : EXIT_FAILURE;
1443 int header_size = 256;
1444 int start, end, domain, size, sptr;
1447 int prevlines_length = 0;
1449 register int ptr = 0;
1451 BOOL contains_resent_headers = FALSE;
1452 BOOL extracted_ignored = FALSE;
1453 BOOL first_line_ended_crlf = TRUE_UNSET;
1454 BOOL smtp_yield = TRUE;
1457 BOOL resents_exist = FALSE;
1458 uschar *resent_prefix = US"";
1459 uschar *blackholed_by = NULL;
1460 uschar *blackhole_log_msg = US"";
1461 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1464 error_block *bad_addresses = NULL;
1466 uschar *frozen_by = NULL;
1467 uschar *queued_by = NULL;
1470 struct stat statbuf;
1472 /* Final message to give to SMTP caller, and messages from ACLs */
1474 uschar *smtp_reply = NULL;
1475 uschar *user_msg, *log_msg;
1477 /* Working header pointers */
1479 header_line *h, *next;
1481 /* Flags for noting the existence of certain headers (only one left) */
1483 BOOL date_header_exists = FALSE;
1485 /* Pointers to receive the addresses of headers whose contents we need. */
1487 header_line *from_header = NULL;
1488 header_line *subject_header = NULL;
1489 header_line *msgid_header = NULL;
1490 header_line *received_header;
1492 #ifdef EXPERIMENTAL_DMARC
1494 #endif /* EXPERIMENTAL_DMARC */
1496 /* Variables for use when building the Received: header. */
1501 /* Release any open files that might have been cached while preparing to
1502 accept the message - e.g. by verifying addresses - because reading a message
1503 might take a fair bit of real time. */
1507 /* Extracting the recipient list from an input file is incompatible with
1508 cutthrough delivery with the no-spool option. It shouldn't be possible
1509 to set up the combination, but just in case kill any ongoing connection. */
1510 if (extract_recip || !smtp_input)
1511 cancel_cutthrough_connection("not smtp input");
1513 /* Initialize the chain of headers by setting up a place-holder for Received:
1514 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1515 pointing to the end of the chain to make adding headers simple. */
1517 received_header = header_list = header_last = store_get(sizeof(header_line));
1518 header_list->next = NULL;
1519 header_list->type = htype_old;
1520 header_list->text = NULL;
1521 header_list->slen = 0;
1523 /* Control block for the next header to be read. */
1525 next = store_get(sizeof(header_line));
1526 next->text = store_get(header_size);
1528 /* Initialize message id to be null (indicating no message read), and the
1529 header names list to be the normal list. Indicate there is no data file open
1530 yet, initialize the size and warning count, and deal with no size limit. */
1538 received_count = 1; /* For the one we will add */
1540 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1542 /* While reading the message, the following counts are computed. */
1544 message_linecount = body_linecount = body_zerocount =
1545 max_received_linelength = 0;
1547 #ifndef DISABLE_DKIM
1548 /* Call into DKIM to set up the context. */
1549 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1552 #ifdef EXPERIMENTAL_DMARC
1553 /* initialize libopendmarc */
1554 dmarc_up = dmarc_init();
1557 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1558 ids, and fractions of a second are required. See the comments that precede the
1559 message id creation below. */
1561 (void)gettimeofday(&message_id_tv, NULL);
1563 /* For other uses of the received time we can operate with granularity of one
1564 second, and for that we use the global variable received_time. This is for
1565 things like ultimate message timeouts. */
1567 received_time = message_id_tv.tv_sec;
1569 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1570 happen in the smtp_getc() function when it refills its buffer. */
1572 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1574 /* If not SMTP input, timeout happens only if configured, and we just set a
1575 single timeout for the whole message. */
1577 else if (receive_timeout > 0)
1579 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1580 alarm(receive_timeout);
1583 /* SIGTERM and SIGINT are caught always. */
1585 signal(SIGTERM, data_sigterm_sigint_handler);
1586 signal(SIGINT, data_sigterm_sigint_handler);
1588 /* Header lines in messages are not supposed to be very long, though when
1589 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1590 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1591 storing the header, and extend this as necessary using string_cat().
1593 To cope with total lunacies, impose an upper limit on the length of the header
1594 section of the message, as otherwise the store will fill up. We must also cope
1595 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1596 Folded header lines are joined into one string, leaving the '\n' characters
1597 inside them, so that writing them out reproduces the input.
1599 Loop for each character of each header; the next structure for chaining the
1600 header is set up already, with ptr the offset of the next character in
1605 int ch = (receive_getc)();
1607 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1608 SMTP must have a correct "." terminator. */
1610 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1612 smtp_reply = handle_lost_connection(US" (header)");
1614 goto TIDYUP; /* Skip to end of function */
1617 /* See if we are at the current header's size limit - there must be at least
1618 four bytes left. This allows for the new character plus a zero, plus two for
1619 extra insertions when we are playing games with dots and carriage returns. If
1620 we are at the limit, extend the text buffer. This could have been done
1621 automatically using string_cat() but because this is a tightish loop storing
1622 only one character at a time, we choose to do it inline. Normally
1623 store_extend() will be able to extend the block; only at the end of a big
1624 store block will a copy be needed. To handle the case of very long headers
1625 (and sometimes lunatic messages can have ones that are 100s of K long) we
1626 call store_release() for strings that have been copied - if the string is at
1627 the start of a block (and therefore the only thing in it, because we aren't
1628 doing any other gets), the block gets freed. We can only do this because we
1629 know there are no other calls to store_get() going on. */
1631 if (ptr >= header_size - 4)
1633 int oldsize = header_size;
1634 /* header_size += 256; */
1636 if (!store_extend(next->text, oldsize, header_size))
1638 uschar *newtext = store_get(header_size);
1639 memcpy(newtext, next->text, ptr);
1640 store_release(next->text);
1641 next->text = newtext;
1645 /* Cope with receiving a binary zero. There is dispute about whether
1646 these should be allowed in RFC 822 messages. The middle view is that they
1647 should not be allowed in headers, at least. Exim takes this attitude at
1648 the moment. We can't just stomp on them here, because we don't know that
1649 this line is a header yet. Set a flag to cause scanning later. */
1651 if (ch == 0) had_zero++;
1653 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1654 those from data files use just LF. Treat LF in local SMTP input as a
1655 terminator too. Treat EOF as a line terminator always. */
1657 if (ch == EOF) goto EOL;
1659 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1660 other MTAs accept this. We are therefore forced into this "liberalisation"
1661 too, so we accept LF as a line terminator whatever the source of the message.
1662 However, if the first line of the message ended with a CRLF, we treat a bare
1663 LF specially by inserting a white space after it to ensure that the header
1664 line is not terminated. */
1668 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1669 else if (first_line_ended_crlf) receive_ungetc(' ');
1673 /* This is not the end of the line. If this is SMTP input and this is
1674 the first character in the line and it is a "." character, ignore it.
1675 This implements the dot-doubling rule, though header lines starting with
1676 dots aren't exactly common. They are legal in RFC 822, though. If the
1677 following is CRLF or LF, this is the line that that terminates the
1678 entire message. We set message_ended to indicate this has happened (to
1679 prevent further reading), and break out of the loop, having freed the
1680 empty header, and set next = NULL to indicate no data line. */
1682 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1684 ch = (receive_getc)();
1687 ch = (receive_getc)();
1691 ch = '\r'; /* Revert to CR */
1696 message_ended = END_DOT;
1699 break; /* End character-reading loop */
1702 /* For non-SMTP input, the dot at the start of the line was really a data
1703 character. What is now in ch is the following character. We guaranteed
1704 enough space for this above. */
1708 next->text[ptr++] = '.';
1713 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1714 remember this case if this is the first line ending. */
1718 ch = (receive_getc)();
1721 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1725 /* Otherwise, put back the character after CR, and turn the bare CR
1728 ch = (receive_ungetc)(ch);
1729 next->text[ptr++] = '\n';
1734 /* We have a data character for the header line. */
1736 next->text[ptr++] = ch; /* Add to buffer */
1737 message_size++; /* Total message size so far */
1739 /* Handle failure due to a humungously long header section. The >= allows
1740 for the terminating \n. Add what we have so far onto the headers list so
1741 that it gets reflected in any error message, and back up the just-read
1744 if (message_size >= header_maxsize)
1746 next->text[ptr] = 0;
1748 next->type = htype_other;
1750 header_last->next = next;
1753 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1754 "%s (more than %d characters): message abandoned",
1755 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1759 smtp_reply = US"552 Message header is ridiculously long";
1760 receive_swallow_smtp();
1761 goto TIDYUP; /* Skip to end of function */
1766 give_local_error(ERRMESS_VLONGHEADER,
1767 string_sprintf("message header longer than %d characters received: "
1768 "message not accepted", header_maxsize), US"", error_rc, stdin,
1770 /* Does not return */
1774 continue; /* With next input character */
1776 /* End of header line reached */
1780 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1782 receive_linecount++;
1783 message_linecount++;
1785 /* Keep track of maximum line length */
1787 if (ptr - prevlines_length > max_received_linelength)
1788 max_received_linelength = ptr - prevlines_length;
1789 prevlines_length = ptr + 1;
1791 /* Now put in the terminating newline. There is always space for
1792 at least two more characters. */
1794 next->text[ptr++] = '\n';
1797 /* A blank line signals the end of the headers; release the unwanted
1798 space and set next to NULL to indicate this. */
1807 /* There is data in the line; see if the next input character is a
1808 whitespace character. If it is, we have a continuation of this header line.
1809 There is always space for at least one character at this point. */
1813 int nextch = (receive_getc)();
1814 if (nextch == ' ' || nextch == '\t')
1816 next->text[ptr++] = nextch;
1818 continue; /* Iterate the loop */
1820 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1821 else ch = EOF; /* Cause main loop to exit at end */
1824 /* We have got to the real line end. Terminate the string and release store
1825 beyond it. If it turns out to be a real header, internal binary zeros will
1826 be squashed later. */
1828 next->text[ptr] = 0;
1830 store_reset(next->text + ptr + 1);
1832 /* Check the running total size against the overall message size limit. We
1833 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1834 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1835 headers - the code to read the body will then also hit the buffer. */
1837 if (message_size > thismessage_size_limit) break;
1839 /* A line that is not syntactically correct for a header also marks
1840 the end of the headers. In this case, we leave next containing the
1841 first data line. This might actually be several lines because of the
1842 continuation logic applied above, but that doesn't matter.
1844 It turns out that smail, and presumably sendmail, accept leading lines
1847 From ph10 Fri Jan 5 12:35 GMT 1996
1849 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1850 find any documentation of this, but for compatibility it had better be
1851 accepted. Exim restricts it to the case of non-smtp messages, and
1852 treats it as an alternative to the -f command line option. Thus it is
1853 ignored except for trusted users or filter testing. Otherwise it is taken
1854 as the sender address, unless -f was used (sendmail compatibility).
1856 It further turns out that some UUCPs generate the From_line in a different
1859 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1861 The regex for matching these things is now capable of recognizing both
1862 formats (including 2- and 4-digit years in the latter). In fact, the regex
1863 is now configurable, as is the expansion string to fish out the sender.
1865 Even further on it has been discovered that some broken clients send
1866 these lines in SMTP messages. There is now an option to ignore them from
1867 specified hosts or networks. Sigh. */
1869 if (header_last == header_list &&
1872 (sender_host_address != NULL &&
1873 verify_check_host(&ignore_fromline_hosts) == OK)
1875 (sender_host_address == NULL && ignore_fromline_local)
1877 regex_match_and_setup(regex_From, next->text, 0, -1))
1879 if (!sender_address_forced)
1881 uschar *uucp_sender = expand_string(uucp_from_sender);
1882 if (uucp_sender == NULL)
1884 log_write(0, LOG_MAIN|LOG_PANIC,
1885 "expansion of \"%s\" failed after matching "
1886 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1890 int start, end, domain;
1892 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1893 &start, &end, &domain, TRUE);
1894 if (newsender != NULL)
1896 if (domain == 0 && newsender[0] != 0)
1897 newsender = rewrite_address_qualify(newsender, FALSE);
1899 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1901 sender_address = newsender;
1903 if (trusted_caller || filter_test != FTEST_NONE)
1905 authenticated_sender = NULL;
1906 originator_name = US"";
1907 sender_local = FALSE;
1910 if (filter_test != FTEST_NONE)
1911 printf("Sender taken from \"From \" line\n");
1918 /* Not a leading "From " line. Check to see if it is a valid header line.
1919 Header names may contain any non-control characters except space and colon,
1924 uschar *p = next->text;
1926 /* If not a valid header line, break from the header reading loop, leaving
1927 next != NULL, indicating that it holds the first line of the body. */
1929 if (isspace(*p)) break;
1930 while (mac_isgraph(*p) && *p != ':') p++;
1931 while (isspace(*p)) p++;
1934 body_zerocount = had_zero;
1938 /* We have a valid header line. If there were any binary zeroes in
1939 the line, stomp on them here. */
1942 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1944 /* It is perfectly legal to have an empty continuation line
1945 at the end of a header, but it is confusing to humans
1946 looking at such messages, since it looks like a blank line.
1947 Reduce confusion by removing redundant white space at the
1948 end. We know that there is at least one printing character
1949 (the ':' tested for above) so there is no danger of running
1952 p = next->text + ptr - 2;
1955 while (*p == ' ' || *p == '\t') p--;
1956 if (*p != '\n') break;
1957 ptr = (p--) - next->text + 1;
1958 message_size -= next->slen - ptr;
1959 next->text[ptr] = 0;
1963 /* Add the header to the chain */
1965 next->type = htype_other;
1967 header_last->next = next;
1970 /* Check the limit for individual line lengths. This comes after adding to
1971 the chain so that the failing line is reflected if a bounce is generated
1972 (for a local message). */
1974 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1976 log_write(0, LOG_MAIN, "overlong message header line received from "
1977 "%s (more than %d characters): message abandoned",
1978 sender_host_unknown? sender_ident : sender_fullhost,
1979 header_line_maxsize);
1983 smtp_reply = US"552 A message header line is too long";
1984 receive_swallow_smtp();
1985 goto TIDYUP; /* Skip to end of function */
1990 give_local_error(ERRMESS_VLONGHDRLINE,
1991 string_sprintf("message header line longer than %d characters "
1992 "received: message not accepted", header_line_maxsize), US"",
1993 error_rc, stdin, header_list->next);
1994 /* Does not return */
1998 /* Note if any resent- fields exist. */
2000 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2002 resents_exist = TRUE;
2003 resent_prefix = US"Resent-";
2007 /* The line has been handled. If we have hit EOF, break out of the loop,
2008 indicating no pending data line. */
2010 if (ch == EOF) { next = NULL; break; }
2012 /* Set up for the next header */
2015 next = store_get(sizeof(header_line));
2016 next->text = store_get(header_size);
2019 prevlines_length = 0;
2020 } /* Continue, starting to read the next header */
2022 /* At this point, we have read all the headers into a data structure in main
2023 store. The first header is still the dummy placeholder for the Received: header
2024 we are going to generate a bit later on. If next != NULL, it contains the first
2025 data line - which terminated the headers before reaching a blank line (not the
2030 debug_printf(">>Headers received:\n");
2031 for (h = header_list->next; h != NULL; h = h->next)
2032 debug_printf("%s", h->text);
2036 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2037 is dropped immediately after valid headers, the next thing we will see is EOF.
2038 We must test for this specially, as further down the reading of the data is
2039 skipped if already at EOF. */
2041 if (smtp_input && (receive_feof)())
2043 smtp_reply = handle_lost_connection(US" (after header)");
2045 goto TIDYUP; /* Skip to end of function */
2048 /* If this is a filter test run and no headers were read, output a warning
2049 in case there is a mistake in the test message. */
2051 if (filter_test != FTEST_NONE && header_list->next == NULL)
2052 printf("Warning: no message headers read\n");
2055 /* Scan the headers to identify them. Some are merely marked for later
2056 processing; some are dealt with here. */
2058 for (h = header_list->next; h != NULL; h = h->next)
2060 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2061 if (is_resent) contains_resent_headers = TRUE;
2063 switch (header_checkname(h, is_resent))
2066 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2070 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2073 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2076 if (!resents_exist || is_resent) date_header_exists = TRUE;
2079 /* Same comments as about Return-Path: below. */
2081 case htype_delivery_date:
2082 if (delivery_date_remove) h->type = htype_old;
2085 /* Same comments as about Return-Path: below. */
2087 case htype_envelope_to:
2088 if (envelope_to_remove) h->type = htype_old;
2091 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2092 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2093 header consists of just the login id of the user who called Exim, rewrite
2094 it with the gecos field first. Apply this rule to Resent-From: if there
2095 are resent- fields. */
2098 h->type = htype_from;
2099 if (!resents_exist || is_resent)
2105 uschar *s = Ustrchr(h->text, ':') + 1;
2106 while (isspace(*s)) s++;
2107 len = h->slen - (s - h->text) - 1;
2108 if (Ustrlen(originator_login) == len &&
2109 strncmpic(s, originator_login, len) == 0)
2111 uschar *name = is_resent? US"Resent-From" : US"From";
2112 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2113 originator_login, qualify_domain_sender);
2114 from_header = header_last;
2115 h->type = htype_old;
2116 DEBUG(D_receive|D_rewrite)
2117 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2123 /* Identify the Message-id: header for generating "in-reply-to" in the
2124 autoreply transport. For incoming logging, save any resent- value. In both
2125 cases, take just the first of any multiples. */
2128 if (msgid_header == NULL && (!resents_exist || is_resent))
2135 /* Flag all Received: headers */
2137 case htype_received:
2138 h->type = htype_received;
2142 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2144 case htype_reply_to:
2145 h->type = htype_reply_to;
2148 /* The Return-path: header is supposed to be added to messages when
2149 they leave the SMTP system. We shouldn't receive messages that already
2150 contain Return-path. However, since Exim generates Return-path: on
2151 local delivery, resent messages may well contain it. We therefore
2152 provide an option (which defaults on) to remove any Return-path: headers
2153 on input. Removal actually means flagging as "old", which prevents the
2154 header being transmitted with the message. */
2156 case htype_return_path:
2157 if (return_path_remove) h->type = htype_old;
2159 /* If we are testing a mail filter file, use the value of the
2160 Return-Path: header to set up the return_path variable, which is not
2161 otherwise set. However, remove any <> that surround the address
2162 because the variable doesn't have these. */
2164 if (filter_test != FTEST_NONE)
2166 uschar *start = h->text + 12;
2167 uschar *end = start + Ustrlen(start);
2168 while (isspace(*start)) start++;
2169 while (end > start && isspace(end[-1])) end--;
2170 if (*start == '<' && end[-1] == '>')
2175 return_path = string_copyn(start, end - start);
2176 printf("Return-path taken from \"Return-path:\" header line\n");
2180 /* If there is a "Sender:" header and the message is locally originated,
2181 and from an untrusted caller and suppress_local_fixups is not set, or if we
2182 are in submission mode for a remote message, mark it "old" so that it will
2183 not be transmitted with the message, unless active_local_sender_retain is
2184 set. (This can only be true if active_local_from_check is false.) If there
2185 are any resent- headers in the message, apply this rule to Resent-Sender:
2186 instead of Sender:. Messages with multiple resent- header sets cannot be
2187 tidily handled. (For this reason, at least one MUA - Pine - turns old
2188 resent- headers into X-resent- headers when resending, leaving just one
2192 h->type = ((!active_local_sender_retain &&
2194 (sender_local && !trusted_caller && !suppress_local_fixups)
2198 (!resents_exist||is_resent))?
2199 htype_old : htype_sender;
2202 /* Remember the Subject: header for logging. There is no Resent-Subject */
2208 /* "To:" gets flagged, and the existence of a recipient header is noted,
2209 whether it's resent- or not. */
2214 to_or_cc_header_exists = TRUE;
2220 /* Extract recipients from the headers if that is required (the -t option).
2221 Note that this is documented as being done *before* any address rewriting takes
2222 place. There are two possibilities:
2224 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2225 recipients already listed are to be REMOVED from the message. Smail 3 works
2226 like this. We need to build a non-recipients tree for that list, because in
2227 subsequent processing this data is held in a tree and that's what the
2228 spool_write_header() function expects. Make sure that non-recipient addresses
2229 are fully qualified and rewritten if necessary.
2231 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2232 those in the command line arguments (and it is rumoured some other MTAs do
2233 this). Therefore, there is an option to make Exim behave this way.
2235 *** Notes on "Resent-" header lines ***
2237 The presence of resent-headers in the message makes -t horribly ambiguous.
2238 Experiments with sendmail showed that it uses recipients for all resent-
2239 headers, totally ignoring the concept of "sets of resent- headers" as described
2240 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2241 with all the addresses in one instance of each header.
2243 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2244 error for -t if there were resent- headers in the message. However, after a
2245 discussion on the mailing list, I've learned that there are MUAs that use
2246 resent- headers with -t, and also that the stuff about sets of resent- headers
2247 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2248 message with -t and resent- header lines makes sure that only *its* resent-
2249 headers are present; previous ones are often renamed as X-resent- for example.
2251 Consequently, Exim has been changed so that, if any resent- header lines are
2252 present, the recipients are taken from all of the appropriate resent- lines,
2253 and not from the ordinary To:, Cc:, etc. */
2258 error_block **bnext = &bad_addresses;
2260 if (extract_addresses_remove_arguments)
2262 while (recipients_count-- > 0)
2264 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2265 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2266 tree_add_nonrecipient(s);
2268 recipients_list = NULL;
2269 recipients_count = recipients_list_max = 0;
2272 /* Now scan the headers */
2274 for (h = header_list->next; h != NULL; h = h->next)
2276 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2277 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2279 uschar *s = Ustrchr(h->text, ':') + 1;
2280 while (isspace(*s)) s++;
2282 parse_allow_group = TRUE; /* Allow address group syntax */
2286 uschar *ss = parse_find_address_end(s, FALSE);
2287 uschar *recipient, *errmess, *p, *pp;
2288 int start, end, domain;
2290 /* Check on maximum */
2292 if (recipients_max > 0 && ++rcount > recipients_max)
2294 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2295 US"message rejected: ", error_rc, stdin, NULL);
2296 /* Does not return */
2299 /* Make a copy of the address, and remove any internal newlines. These
2300 may be present as a result of continuations of the header line. The
2301 white space that follows the newline must not be removed - it is part
2304 pp = recipient = store_get(ss - s + 1);
2305 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2307 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2310 /* Keep a list of all the bad addresses so we can send a single
2311 error message at the end. However, an empty address is not an error;
2312 just ignore it. This can come from an empty group list like
2314 To: Recipients of list:;
2316 If there are no recipients at all, an error will occur later. */
2318 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2320 int len = Ustrlen(s);
2321 error_block *b = store_get(sizeof(error_block));
2322 while (len > 0 && isspace(s[len-1])) len--;
2324 b->text1 = string_printing(string_copyn(s, len));
2330 /* If the recipient is already in the nonrecipients tree, it must
2331 have appeared on the command line with the option extract_addresses_
2332 remove_arguments set. Do not add it to the recipients, and keep a note
2333 that this has happened, in order to give a better error if there are
2334 no recipients left. */
2336 else if (recipient != NULL)
2338 if (tree_search(tree_nonrecipients, recipient) == NULL)
2339 receive_add_recipient(recipient, -1);
2341 extracted_ignored = TRUE;
2344 /* Move on past this address */
2346 s = ss + (*ss? 1:0);
2347 while (isspace(*s)) s++;
2348 } /* Next address */
2350 parse_allow_group = FALSE; /* Reset group syntax flags */
2351 parse_found_group = FALSE;
2353 /* If this was the bcc: header, mark it "old", which means it
2354 will be kept on the spool, but not transmitted as part of the
2357 if (h->type == htype_bcc) h->type = htype_old;
2358 } /* For appropriate header line */
2359 } /* For each header line */
2363 /* Now build the unique message id. This has changed several times over the
2364 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2365 Retaining all the history in the comment has become too unwieldy - read
2366 previous release sources if you want it.
2368 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2369 The first part is the current time, in seconds. The second part is the current
2370 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2371 can hold a number in the range 0-3843. It used to be a computed sequence
2372 number, but is now the fractional component of the current time in units of
2373 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2374 received, Exim ensures that the timer has ticked at the appropriate level
2375 before proceeding, to avoid duplication if the pid happened to be re-used
2376 within the same time period. It seems likely that most messages will take at
2377 least half a millisecond to be received, so no delay will normally be
2378 necessary. At least for some time...
2380 There is a modification when localhost_number is set. Formerly this was allowed
2381 to be as large as 255. Now it is restricted to the range 0-16, and the final
2382 component of the message id becomes (localhost_number * 200) + fractional time
2383 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2385 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2386 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2387 still allows the tttttt field to hold a large enough number to last for some
2388 more decades, and the final two-digit field can hold numbers up to 1295, which
2389 is enough for milliseconds (instead of 1/2000 of a second).
2391 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2392 pid, so it is probably safe because pids have to be positive. The
2393 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2394 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2396 Note that string_base62() returns its data in a static storage block, so it
2397 must be copied before calling string_base62() again. It always returns exactly
2400 There doesn't seem to be anything in the RFC which requires a message id to
2401 start with a letter, but Smail was changed to ensure this. The external form of
2402 the message id (as supplied by string expansion) therefore starts with an
2403 additional leading 'E'. The spool file names do not include this leading
2404 letter and it is not used internally.
2406 NOTE: If ever the format of message ids is changed, the regular expression for
2407 checking that a string is in this format must be updated in a corresponding
2408 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2409 must also be changed to reflect the correct string length. Then, of course,
2410 other programs that rely on the message id format will need updating too. */
2412 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2413 message_id[6] = '-';
2414 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2416 /* Deal with the case where the host number is set. The value of the number was
2417 checked when it was read, to ensure it isn't too big. The timing granularity is
2418 left in id_resolution so that an appropriate wait can be done after receiving
2419 the message, if necessary (we hope it won't be). */
2421 if (host_number_string != NULL)
2423 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2424 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2425 string_base62((long int)(
2426 host_number * (1000000/id_resolution) +
2427 message_id_tv.tv_usec/id_resolution)) + 4);
2430 /* Host number not set: final field is just the fractional time at an
2431 appropriate resolution. */
2435 id_resolution = (BASE_62 == 62)? 500 : 1000;
2436 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2437 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2440 /* Add the current message id onto the current process info string if
2443 (void)string_format(process_info + process_info_len,
2444 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2446 /* If we are using multiple input directories, set up the one for this message
2447 to be the least significant base-62 digit of the time of arrival. Otherwise
2448 ensure that it is an empty string. */
2450 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2452 /* Now that we have the message-id, if there is no message-id: header, generate
2453 one, but only for local (without suppress_local_fixups) or submission mode
2454 messages. This can be user-configured if required, but we had better flatten
2455 any illegal characters therein. */
2457 if (msgid_header == NULL &&
2458 ((sender_host_address == NULL && !suppress_local_fixups)
2459 || submission_mode))
2462 uschar *id_text = US"";
2463 uschar *id_domain = primary_hostname;
2465 /* Permit only letters, digits, dots, and hyphens in the domain */
2467 if (message_id_domain != NULL)
2469 uschar *new_id_domain = expand_string(message_id_domain);
2470 if (new_id_domain == NULL)
2472 if (!expand_string_forcedfail)
2473 log_write(0, LOG_MAIN|LOG_PANIC,
2474 "expansion of \"%s\" (message_id_header_domain) "
2475 "failed: %s", message_id_domain, expand_string_message);
2477 else if (*new_id_domain != 0)
2479 id_domain = new_id_domain;
2480 for (p = id_domain; *p != 0; p++)
2481 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2485 /* Permit all characters except controls and RFC 2822 specials in the
2486 additional text part. */
2488 if (message_id_text != NULL)
2490 uschar *new_id_text = expand_string(message_id_text);
2491 if (new_id_text == NULL)
2493 if (!expand_string_forcedfail)
2494 log_write(0, LOG_MAIN|LOG_PANIC,
2495 "expansion of \"%s\" (message_id_header_text) "
2496 "failed: %s", message_id_text, expand_string_message);
2498 else if (*new_id_text != 0)
2500 id_text = new_id_text;
2501 for (p = id_text; *p != 0; p++)
2502 if (mac_iscntrl_or_special(*p)) *p = '-';
2506 /* Add the header line
2507 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2508 * appended, to preserve classical expectations of header ordering. */
2510 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2511 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2512 (*id_text == 0)? "" : ".", id_text, id_domain);
2515 /* If we are to log recipients, keep a copy of the raw ones before any possible
2516 rewriting. Must copy the count, because later ACLs and the local_scan()
2517 function may mess with the real recipients. */
2519 if ((log_extra_selector & LX_received_recipients) != 0)
2521 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2522 for (i = 0; i < recipients_count; i++)
2523 raw_recipients[i] = string_copy(recipients_list[i].address);
2524 raw_recipients_count = recipients_count;
2527 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2528 recipients will get here only if the conditions were right (allow_unqualified_
2529 recipient is TRUE). */
2531 for (i = 0; i < recipients_count; i++)
2532 recipients_list[i].address =
2533 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2534 global_rewrite_rules, rewrite_existflags);
2536 /* If there is no From: header, generate one for local (without
2537 suppress_local_fixups) or submission_mode messages. If there is no sender
2538 address, but the sender is local or this is a local delivery error, use the
2539 originator login. This shouldn't happen for genuine bounces, but might happen
2540 for autoreplies. The addition of From: must be done *before* checking for the
2541 possible addition of a Sender: header, because untrusted_set_sender allows an
2542 untrusted user to set anything in the envelope (which might then get info
2543 From:) but we still want to ensure a valid Sender: if it is required. */
2545 if (from_header == NULL &&
2546 ((sender_host_address == NULL && !suppress_local_fixups)
2547 || submission_mode))
2549 uschar *oname = US"";
2551 /* Use the originator_name if this is a locally submitted message and the
2552 caller is not trusted. For trusted callers, use it only if -F was used to
2553 force its value or if we have a non-SMTP message for which -f was not used
2554 to set the sender. */
2556 if (sender_host_address == NULL)
2558 if (!trusted_caller || sender_name_forced ||
2559 (!smtp_input && !sender_address_forced))
2560 oname = originator_name;
2563 /* For non-locally submitted messages, the only time we use the originator
2564 name is when it was forced by the /name= option on control=submission. */
2568 if (submission_name != NULL) oname = submission_name;
2571 /* Envelope sender is empty */
2573 if (sender_address[0] == 0)
2575 uschar *fromstart, *fromend;
2577 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2578 oname, (oname[0] == 0)? "" : " <");
2579 fromend = (oname[0] == 0)? US"" : US">";
2581 if (sender_local || local_error_message)
2583 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2584 local_part_quote(originator_login), qualify_domain_sender,
2587 else if (submission_mode && authenticated_id != NULL)
2589 if (submission_domain == NULL)
2591 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2592 local_part_quote(authenticated_id), qualify_domain_sender,
2595 else if (submission_domain[0] == 0) /* empty => whole address set */
2597 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2602 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2603 local_part_quote(authenticated_id), submission_domain,
2606 from_header = header_last; /* To get it checked for Sender: */
2610 /* There is a non-null envelope sender. Build the header using the original
2611 sender address, before any rewriting that might have been done while
2616 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2618 (oname[0] == 0)? "" : " <",
2619 (sender_address_unrewritten == NULL)?
2620 sender_address : sender_address_unrewritten,
2621 (oname[0] == 0)? "" : ">");
2623 from_header = header_last; /* To get it checked for Sender: */
2628 /* If the sender is local (without suppress_local_fixups), or if we are in
2629 submission mode and there is an authenticated_id, check that an existing From:
2630 is correct, and if not, generate a Sender: header, unless disabled. Any
2631 previously-existing Sender: header was removed above. Note that sender_local,
2632 as well as being TRUE if the caller of exim is not trusted, is also true if a
2633 trusted caller did not supply a -f argument for non-smtp input. To allow
2634 trusted callers to forge From: without supplying -f, we have to test explicitly
2635 here. If the From: header contains more than one address, then the call to
2636 parse_extract_address fails, and a Sender: header is inserted, as required. */
2638 if (from_header != NULL &&
2639 (active_local_from_check &&
2640 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2641 (submission_mode && authenticated_id != NULL))
2644 BOOL make_sender = TRUE;
2645 int start, end, domain;
2647 uschar *from_address =
2648 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2649 &start, &end, &domain, FALSE);
2650 uschar *generated_sender_address;
2652 if (submission_mode)
2654 if (submission_domain == NULL)
2656 generated_sender_address = string_sprintf("%s@%s",
2657 local_part_quote(authenticated_id), qualify_domain_sender);
2659 else if (submission_domain[0] == 0) /* empty => full address */
2661 generated_sender_address = string_sprintf("%s",
2666 generated_sender_address = string_sprintf("%s@%s",
2667 local_part_quote(authenticated_id), submission_domain);
2671 generated_sender_address = string_sprintf("%s@%s",
2672 local_part_quote(originator_login), qualify_domain_sender);
2674 /* Remove permitted prefixes and suffixes from the local part of the From:
2675 address before doing the comparison with the generated sender. */
2677 if (from_address != NULL)
2680 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2682 if (at != NULL) *at = 0;
2683 from_address += route_check_prefix(from_address, local_from_prefix);
2684 slen = route_check_suffix(from_address, local_from_suffix);
2687 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2688 from_address += slen;
2690 if (at != NULL) *at = '@';
2692 if (strcmpic(generated_sender_address, from_address) == 0 ||
2693 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2694 make_sender = FALSE;
2697 /* We have to cause the Sender header to be rewritten if there are
2698 appropriate rewriting rules. */
2702 if (submission_mode && submission_name == NULL)
2703 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2704 generated_sender_address);
2706 header_add(htype_sender, "%sSender: %s <%s>\n",
2708 submission_mode? submission_name : originator_name,
2709 generated_sender_address);
2712 /* Ensure that a non-null envelope sender address corresponds to the
2713 submission mode sender address. */
2715 if (submission_mode && sender_address[0] != 0)
2717 if (sender_address_unrewritten == NULL)
2718 sender_address_unrewritten = sender_address;
2719 sender_address = generated_sender_address;
2720 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2721 log_write(L_address_rewrite, LOG_MAIN,
2722 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2723 sender_address_unrewritten, generated_sender_address);
2727 /* If there are any rewriting rules, apply them to the sender address, unless
2728 it has already been rewritten as part of verification for SMTP input. */
2730 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2731 sender_address[0] != 0)
2733 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2734 global_rewrite_rules, rewrite_existflags);
2735 DEBUG(D_receive|D_rewrite)
2736 debug_printf("rewritten sender = %s\n", sender_address);
2740 /* The headers must be run through rewrite_header(), because it ensures that
2741 addresses are fully qualified, as well as applying any rewriting rules that may
2744 Qualification of header addresses in a message from a remote host happens only
2745 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2746 appropriate. For local messages, qualification always happens, unless -bnq is
2747 used to explicitly suppress it. No rewriting is done for an unqualified address
2748 that is left untouched.
2750 We start at the second header, skipping our own Received:. This rewriting is
2751 documented as happening *after* recipient addresses are taken from the headers
2752 by the -t command line option. An added Sender: gets rewritten here. */
2754 for (h = header_list->next; h != NULL; h = h->next)
2756 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2757 rewrite_existflags, TRUE);
2758 if (newh != NULL) h = newh;
2762 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2763 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2764 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2765 exists, this applies to the set of resent- headers rather than the normal set.
2767 The requirement for a recipient header has been removed in RFC 2822. At this
2768 point in the code, earlier versions of Exim added a To: header for locally
2769 submitted messages, and an empty Bcc: header for others. In the light of the
2770 changes in RFC 2822, this was dropped in November 2003. */
2773 /* If there is no date header, generate one if the message originates locally
2774 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2775 submission mode flag is set. Messages without Date: are not valid, but it seems
2776 to be more confusing if Exim adds one to all remotely-originated messages.
2777 As per Message-Id, we prepend if resending, else append.
2780 if (!date_header_exists &&
2781 ((sender_host_address == NULL && !suppress_local_fixups)
2782 || submission_mode))
2783 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2784 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2786 search_tidyup(); /* Free any cached resources */
2788 /* Show the complete set of headers if debugging. Note that the first one (the
2789 new Received:) has not yet been set. */
2793 debug_printf(">>Headers after rewriting and local additions:\n");
2794 for (h = header_list->next; h != NULL; h = h->next)
2795 debug_printf("%c %s", h->type, h->text);
2799 /* The headers are now complete in store. If we are running in filter
2800 testing mode, that is all this function does. Return TRUE if the message
2801 ended with a dot. */
2803 if (filter_test != FTEST_NONE)
2805 process_info[process_info_len] = 0;
2806 return message_ended == END_DOT;
2809 /* Cutthrough delivery:
2810 We have to create the Received header now rather than at the end of reception,
2811 so the timestamp behaviour is a change to the normal case.
2812 XXX Ensure this gets documented XXX.
2813 Having created it, send the headers to the destination.
2815 if (cutthrough_fd >= 0)
2817 if (received_count > received_headers_max)
2819 cancel_cutthrough_connection("too many headers");
2820 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2821 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2822 "Too many \"Received\" headers",
2824 (sender_fullhost == NULL)? "" : " H=",
2825 (sender_fullhost == NULL)? US"" : sender_fullhost,
2826 (sender_ident == NULL)? "" : " U=",
2827 (sender_ident == NULL)? US"" : sender_ident);
2828 message_id[0] = 0; /* Indicate no message accepted */
2829 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2830 goto TIDYUP; /* Skip to end of function */
2832 received_header_gen();
2833 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2834 (void) cutthrough_headers_send();
2838 /* Open a new spool file for the data portion of the message. We need
2839 to access it both via a file descriptor and a stream. Try to make the
2840 directory if it isn't there. Note re use of sprintf: spool_directory
2841 is checked on input to be < 200 characters long. */
2843 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2845 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2848 if (errno == ENOENT)
2851 sprintf(CS temp, "input/%s", message_subdir);
2852 if (message_subdir[0] == 0) temp[5] = 0;
2853 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2854 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2857 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2858 spool_name, strerror(errno));
2861 /* Make sure the file's group is the Exim gid, and double-check the mode
2862 because the group setting doesn't always get set automatically. */
2864 if (fchown(data_fd, exim_uid, exim_gid))
2865 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2866 "Failed setting ownership on spool file %s: %s",
2867 spool_name, strerror(errno));
2868 (void)fchmod(data_fd, SPOOL_MODE);
2870 /* We now have data file open. Build a stream for it and lock it. We lock only
2871 the first line of the file (containing the message ID) because otherwise there
2872 are problems when Exim is run under Cygwin (I'm told). See comments in
2873 spool_in.c, where the same locking is done. */
2875 data_file = fdopen(data_fd, "w+");
2876 lock_data.l_type = F_WRLCK;
2877 lock_data.l_whence = SEEK_SET;
2878 lock_data.l_start = 0;
2879 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2881 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2882 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2883 errno, strerror(errno));
2885 /* We have an open, locked data file. Write the message id to it to make it
2886 self-identifying. Then read the remainder of the input of this message and
2887 write it to the data file. If the variable next != NULL, it contains the first
2888 data line (which was read as a header but then turned out not to have the right
2889 format); write it (remembering that it might contain binary zeros). The result
2890 of fwrite() isn't inspected; instead we call ferror() below. */
2892 fprintf(data_file, "%s-D\n", message_id);
2895 uschar *s = next->text;
2896 int len = next->slen;
2897 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2898 body_linecount++; /* Assumes only 1 line */
2901 /* Note that we might already be at end of file, or the logical end of file
2902 (indicated by '.'), or might have encountered an error while writing the
2903 message id or "next" line. */
2905 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2909 message_ended = read_message_data_smtp(data_file);
2910 receive_linecount++; /* The terminating "." line */
2912 else message_ended = read_message_data(data_file);
2914 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2915 message_linecount += body_linecount;
2917 /* Handle premature termination of SMTP */
2919 if (smtp_input && message_ended == END_EOF)
2921 Uunlink(spool_name); /* Lose data file when closed */
2922 cancel_cutthrough_connection("sender closed connection");
2923 message_id[0] = 0; /* Indicate no message accepted */
2924 smtp_reply = handle_lost_connection(US"");
2926 goto TIDYUP; /* Skip to end of function */
2929 /* Handle message that is too big. Don't use host_or_ident() in the log
2930 message; we want to see the ident value even for non-remote messages. */
2932 if (message_ended == END_SIZE)
2934 Uunlink(spool_name); /* Lose the data file when closed */
2935 cancel_cutthrough_connection("mail too big");
2936 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2938 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2939 "message too big: read=%d max=%d",
2941 (sender_fullhost == NULL)? "" : " H=",
2942 (sender_fullhost == NULL)? US"" : sender_fullhost,
2943 (sender_ident == NULL)? "" : " U=",
2944 (sender_ident == NULL)? US"" : sender_ident,
2946 thismessage_size_limit);
2950 smtp_reply = US"552 Message size exceeds maximum permitted";
2951 message_id[0] = 0; /* Indicate no message accepted */
2952 goto TIDYUP; /* Skip to end of function */
2956 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2957 give_local_error(ERRMESS_TOOBIG,
2958 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2959 US"message rejected: ", error_rc, data_file, header_list);
2960 /* Does not return */
2965 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2966 example, there may be some expansion in an ACL that uses a timer.) */
2968 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2970 /* The message body has now been read into the data file. Call fflush() to
2971 empty the buffers in C, and then call fsync() to get the data written out onto
2972 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2973 having to do this). If there was an I/O error on either input or output,
2974 attempt to send an error message, and unlink the spool file. For non-SMTP input
2975 we can then give up. Note that for SMTP input we must swallow the remainder of
2976 the input in cases of output errors, since the far end doesn't expect to see
2977 anything until the terminating dot line is sent. */
2979 if (fflush(data_file) == EOF || ferror(data_file) ||
2980 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2982 uschar *msg_errno = US strerror(errno);
2983 BOOL input_error = (receive_ferror)() != 0;
2984 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2985 input_error? "Input read" : "Spool write",
2987 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2989 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2990 Uunlink(spool_name); /* Lose the data file */
2991 cancel_cutthrough_connection("error writing spoolfile");
2996 smtp_reply = US"451 Error while reading input data";
2999 smtp_reply = US"451 Error while writing spool file";
3000 receive_swallow_smtp();
3002 message_id[0] = 0; /* Indicate no message accepted */
3003 goto TIDYUP; /* Skip to end of function */
3008 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3009 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3011 /* Does not return */
3016 /* No I/O errors were encountered while writing the data file. */
3018 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3021 /* If there were any bad addresses extracted by -t, or there were no recipients
3022 left after -t, send a message to the sender of this message, or write it to
3023 stderr if the error handling option is set that way. Note that there may
3024 legitimately be no recipients for an SMTP message if they have all been removed
3027 We need to rewind the data file in order to read it. In the case of no
3028 recipients or stderr error writing, throw the data file away afterwards, and
3029 exit. (This can't be SMTP, which always ensures there's at least one
3030 syntactically good recipient address.) */
3032 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3036 if (recipients_count == 0) debug_printf("*** No recipients\n");
3037 if (bad_addresses != NULL)
3039 error_block *eblock = bad_addresses;
3040 debug_printf("*** Bad address(es)\n");
3041 while (eblock != NULL)
3043 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3044 eblock = eblock->next;
3049 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3051 /* If configured to send errors to the sender, but this fails, force
3052 a failure error code. We use a special one for no recipients so that it
3053 can be detected by the autoreply transport. Otherwise error_rc is set to
3054 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3055 it is EXIT_SUCCESS. */
3057 if (error_handling == ERRORS_SENDER)
3059 if (!moan_to_sender(
3060 (bad_addresses == NULL)?
3061 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3062 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3063 bad_addresses, header_list, data_file, FALSE))
3064 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3068 if (bad_addresses == NULL)
3070 if (extracted_ignored)
3071 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3073 fprintf(stderr, "exim: no recipients in message\n");
3077 fprintf(stderr, "exim: invalid address%s",
3078 (bad_addresses->next == NULL)? ":" : "es:\n");
3079 while (bad_addresses != NULL)
3081 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3082 bad_addresses->text2);
3083 bad_addresses = bad_addresses->next;
3088 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3090 Uunlink(spool_name);
3091 (void)fclose(data_file);
3092 exim_exit(error_rc);
3096 /* Data file successfully written. Generate text for the Received: header by
3097 expanding the configured string, and adding a timestamp. By leaving this
3098 operation till now, we ensure that the timestamp is the time that message
3099 reception was completed. However, this is deliberately done before calling the
3100 data ACL and local_scan().
3102 This Received: header may therefore be inspected by the data ACL and by code in
3103 the local_scan() function. When they have run, we update the timestamp to be
3104 the final time of reception.
3106 If there is just one recipient, set up its value in the $received_for variable
3107 for use when we generate the Received: header.
3109 Note: the checking for too many Received: headers is handled by the delivery
3111 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3113 if (received_header->text == NULL) /* Non-cutthrough case */
3115 received_header_gen();
3117 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3119 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3120 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3122 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3123 now, before running the DATA ACL. */
3125 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3128 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3129 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3131 /* If an ACL is specified for checking things at this stage of reception of a
3132 message, run it, unless all the recipients were removed by "discard" in earlier
3133 ACLs. That is the only case in which recipients_count can be zero at this
3134 stage. Set deliver_datafile to point to the data file so that $message_body and
3135 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3138 deliver_datafile = data_fd;
3141 enable_dollar_recipients = TRUE;
3143 if (recipients_count == 0)
3145 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3149 /* Handle interactive SMTP messages */
3151 if (smtp_input && !smtp_batched_input)
3154 #ifndef DISABLE_DKIM
3155 if (!dkim_disable_verify)
3157 /* Finish verification, this will log individual signature results to
3159 dkim_exim_verify_finish();
3161 /* Check if we must run the DKIM ACL */
3162 if ((acl_smtp_dkim != NULL) &&
3163 (dkim_verify_signers != NULL) &&
3164 (dkim_verify_signers[0] != '\0'))
3166 uschar *dkim_verify_signers_expanded =
3167 expand_string(dkim_verify_signers);
3168 if (dkim_verify_signers_expanded == NULL)
3170 log_write(0, LOG_MAIN|LOG_PANIC,
3171 "expansion of dkim_verify_signers option failed: %s",
3172 expand_string_message);
3177 uschar *ptr = dkim_verify_signers_expanded;
3178 uschar *item = NULL;
3179 uschar *seen_items = NULL;
3180 int seen_items_size = 0;
3181 int seen_items_offset = 0;
3182 uschar itembuf[256];
3183 /* Default to OK when no items are present */
3185 while ((item = string_nextinlist(&ptr, &sep,
3187 sizeof(itembuf))) != NULL)
3189 /* Prevent running ACL for an empty item */
3190 if (!item || (item[0] == '\0')) continue;
3191 /* Only run ACL once for each domain or identity, no matter how often it
3192 appears in the expanded list. */
3193 if (seen_items != NULL)
3195 uschar *seen_item = NULL;
3196 uschar seen_item_buf[256];
3197 uschar *seen_items_list = seen_items;
3198 int seen_this_item = 0;
3200 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3202 sizeof(seen_item_buf))) != NULL)
3204 if (Ustrcmp(seen_item,item) == 0)
3211 if (seen_this_item > 0)
3214 debug_printf("acl_smtp_dkim: skipping signer %s, already seen\n", item);
3218 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,":");
3221 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,item);
3222 seen_items[seen_items_offset] = '\0';
3225 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n", item);
3227 dkim_exim_acl_setup(item);
3228 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, &user_msg, &log_msg);
3233 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, skipping remaining items\n", rc, item);
3234 cancel_cutthrough_connection("dkim acl not ok");
3238 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3241 recipients_count = 0;
3242 blackholed_by = US"DKIM ACL";
3243 if (log_msg != NULL)
3244 blackhole_log_msg = string_sprintf(": %s", log_msg);
3248 Uunlink(spool_name);
3249 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3250 smtp_yield = FALSE; /* No more messsages after dropped connection */
3251 smtp_reply = US""; /* Indicate reply already sent */
3252 message_id[0] = 0; /* Indicate no message accepted */
3253 goto TIDYUP; /* Skip to end of function */
3258 #endif /* DISABLE_DKIM */
3260 #ifdef WITH_CONTENT_SCAN
3261 if (recipients_count > 0 &&
3262 acl_smtp_mime != NULL &&
3263 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3265 #endif /* WITH_CONTENT_SCAN */
3267 #ifdef EXPERIMENTAL_DMARC
3268 dmarc_up = dmarc_store_data(from_header);
3269 #endif /* EXPERIMENTAL_DMARC */
3271 #ifndef DISABLE_PRDR
3272 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3276 int all_fail = FAIL;
3278 smtp_printf("353 PRDR content analysis beginning\r\n");
3279 /* Loop through recipients, responses must be in same order received */
3280 for (c = 0; recipients_count > c; c++)
3282 uschar * addr= recipients_list[c].address;
3283 uschar * msg= US"PRDR R=<%s> %s";
3286 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3287 addr, c+1, recipients_count);
3288 rc = acl_check(ACL_WHERE_PRDR, addr,
3289 acl_smtp_data_prdr, &user_msg, &log_msg);
3291 /* If any recipient rejected content, indicate it in final message */
3293 /* If all recipients rejected, indicate in final message */
3298 case OK: case DISCARD: code = US"250"; break;
3299 case DEFER: code = US"450"; break;
3300 default: code = US"550"; break;
3302 if (user_msg != NULL)
3303 smtp_user_msg(code, user_msg);
3308 case OK: case DISCARD:
3309 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3311 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3313 msg = string_sprintf(CS msg, addr, "refusal"); break;
3315 smtp_user_msg(code, msg);
3317 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3318 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3319 else log_write(0, LOG_MAIN, "%s", CS msg);
3321 if (rc != OK) { receive_remove_recipient(addr); c--; }
3323 /* Set up final message, used if data acl gives OK */
3324 smtp_reply = string_sprintf("%s id=%s message %s",
3325 all_fail == FAIL ? US"550" : US"250",
3328 ? US"rejected for all recipients"
3331 : US"accepted for some recipients");
3332 if (recipients_count == 0)
3334 message_id[0] = 0; /* Indicate no message accepted */
3339 prdr_requested = FALSE;
3340 #endif /* !DISABLE_PRDR */
3342 /* Check the recipients count again, as the MIME ACL might have changed
3345 if (acl_smtp_data != NULL && recipients_count > 0)
3347 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3348 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3351 recipients_count = 0;
3352 blackholed_by = US"DATA ACL";
3353 if (log_msg != NULL)
3354 blackhole_log_msg = string_sprintf(": %s", log_msg);
3355 cancel_cutthrough_connection("data acl discard");
3359 Uunlink(spool_name);
3360 cancel_cutthrough_connection("data acl not ok");
3361 #ifdef WITH_CONTENT_SCAN
3364 #ifdef EXPERIMENTAL_DCC
3367 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3368 smtp_yield = FALSE; /* No more messsages after dropped connection */
3369 smtp_reply = US""; /* Indicate reply already sent */
3370 message_id[0] = 0; /* Indicate no message accepted */
3371 goto TIDYUP; /* Skip to end of function */
3376 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3377 we cannot take different actions for permanent and temporary rejections. */
3382 #ifdef WITH_CONTENT_SCAN
3383 if (acl_not_smtp_mime != NULL &&
3384 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3387 #endif /* WITH_CONTENT_SCAN */
3389 if (acl_not_smtp != NULL)
3391 uschar *user_msg, *log_msg;
3392 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3395 recipients_count = 0;
3396 blackholed_by = US"non-SMTP ACL";
3397 if (log_msg != NULL)
3398 blackhole_log_msg = string_sprintf(": %s", log_msg);
3402 Uunlink(spool_name);
3403 #ifdef WITH_CONTENT_SCAN
3406 #ifdef EXPERIMENTAL_DCC
3409 /* The ACL can specify where rejections are to be logged, possibly
3410 nowhere. The default is main and reject logs. */
3412 if (log_reject_target != 0)
3413 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3414 sender_address, log_msg);
3416 if (user_msg == NULL) user_msg = US"local configuration problem";
3417 if (smtp_batched_input)
3419 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3420 /* Does not return */
3424 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3425 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3426 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3428 /* Does not return */
3431 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3435 /* The applicable ACLs have been run */
3437 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3438 if (queue_only_policy) queued_by = US"ACL";
3441 #ifdef WITH_CONTENT_SCAN
3445 #ifdef EXPERIMENTAL_DCC
3450 /* The final check on the message is to run the scan_local() function. The
3451 version supplied with Exim always accepts, but this is a hook for sysadmins to
3452 supply their own checking code. The local_scan() function is run even when all
3453 the recipients have been discarded. */
3455 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3457 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3458 deleted, and the incident gets logged. */
3460 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3461 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3462 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3463 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3465 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3466 local_scan_timeout);
3467 local_scan_data = NULL;
3469 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3470 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3471 rc = local_scan(data_fd, &local_scan_data);
3473 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3475 enable_dollar_recipients = FALSE;
3477 store_pool = POOL_MAIN; /* In case changed */
3478 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3481 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3482 os_non_restarting_signal(SIGFPE, SIG_DFL);
3483 os_non_restarting_signal(SIGILL, SIG_DFL);
3484 os_non_restarting_signal(SIGBUS, SIG_DFL);
3486 /* The length check is paranoia against some runaway code, and also because
3487 (for a success return) lines in the spool file are read into big_buffer. */
3489 if (local_scan_data != NULL)
3491 int len = Ustrlen(local_scan_data);
3492 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3493 local_scan_data = string_copyn(local_scan_data, len);
3496 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3498 if (!deliver_freeze) /* ACL might have already frozen */
3500 deliver_freeze = TRUE;
3501 deliver_frozen_at = time(NULL);
3502 frozen_by = US"local_scan()";
3504 rc = LOCAL_SCAN_ACCEPT;
3506 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3508 if (!queue_only_policy) /* ACL might have already queued */
3510 queue_only_policy = TRUE;
3511 queued_by = US"local_scan()";
3513 rc = LOCAL_SCAN_ACCEPT;
3516 /* Message accepted: remove newlines in local_scan_data because otherwise
3517 the spool file gets corrupted. Ensure that all recipients are qualified. */
3519 if (rc == LOCAL_SCAN_ACCEPT)
3521 if (local_scan_data != NULL)
3524 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3526 for (i = 0; i < recipients_count; i++)
3528 recipient_item *r = recipients_list + i;
3529 r->address = rewrite_address_qualify(r->address, TRUE);
3530 if (r->errors_to != NULL)
3531 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3533 if (recipients_count == 0 && blackholed_by == NULL)
3534 blackholed_by = US"local_scan";
3537 /* Message rejected: newlines permitted in local_scan_data to generate
3538 multiline SMTP responses. */
3542 uschar *istemp = US"";
3548 errmsg = local_scan_data;
3550 Uunlink(spool_name); /* Cancel this message */
3554 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3555 "rejection given", rc);
3558 case LOCAL_SCAN_REJECT_NOLOGHDR:
3559 log_extra_selector &= ~LX_rejected_header;
3562 case LOCAL_SCAN_REJECT:
3563 smtp_code = US"550";
3564 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3567 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3568 log_extra_selector &= ~LX_rejected_header;
3571 case LOCAL_SCAN_TEMPREJECT:
3573 smtp_code = US"451";
3574 if (errmsg == NULL) errmsg = US"Temporary local problem";
3575 istemp = US"temporarily ";
3579 s = string_append(s, &size, &sptr, 2, US"F=",
3580 (sender_address[0] == 0)? US"<>" : sender_address);
3581 s = add_host_info_for_log(s, &size, &sptr);
3584 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3585 s, istemp, string_printing(errmsg));
3589 if (!smtp_batched_input)
3591 smtp_respond(smtp_code, 3, TRUE, errmsg);
3592 message_id[0] = 0; /* Indicate no message accepted */
3593 smtp_reply = US""; /* Indicate reply already sent */
3594 goto TIDYUP; /* Skip to end of function */
3598 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3599 /* Does not return */
3604 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3605 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3606 US"message rejected by local scan code: ", error_rc, data_file,
3608 /* Does not return */
3612 /* Reset signal handlers to ignore signals that previously would have caused
3613 the message to be abandoned. */
3615 signal(SIGTERM, SIG_IGN);
3616 signal(SIGINT, SIG_IGN);
3619 /* Ensure the first time flag is set in the newly-received message. */
3621 deliver_firsttime = TRUE;
3623 #ifdef EXPERIMENTAL_BRIGHTMAIL
3625 /* rewind data file */
3626 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3627 bmi_verdicts = bmi_process_message(header_list, data_fd);
3631 /* Update the timstamp in our Received: header to account for any time taken by
3632 an ACL or by local_scan(). The new time is the time that all reception
3633 processing is complete. */
3635 timestamp = expand_string(US"${tod_full}");
3636 tslen = Ustrlen(timestamp);
3638 memcpy(received_header->text + received_header->slen - tslen - 1,
3641 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3645 deliver_freeze = FALSE;
3646 queue_only_policy = FALSE;
3649 /* Keep the data file open until we have written the header file, in order to
3650 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3651 don't write the header file, and we unlink the data file. If writing the header
3652 file fails, we have failed to accept this message. */
3654 if (host_checking || blackholed_by != NULL)
3657 Uunlink(spool_name);
3658 msg_size = 0; /* Compute size for log line */
3659 for (h = header_list; h != NULL; h = h->next)
3660 if (h->type != '*') msg_size += h->slen;
3663 /* Write the -H file */
3667 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3669 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3670 Uunlink(spool_name); /* Lose the data file */
3674 smtp_reply = US"451 Error in writing spool file";
3675 message_id[0] = 0; /* Indicate no message accepted */
3680 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3681 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3683 /* Does not return */
3689 /* The message has now been successfully received. */
3691 receive_messagecount++;
3693 /* In SMTP sessions we may receive several in one connection. After each one,
3694 we wait for the clock to tick at the level of message-id granularity. This is
3695 so that the combination of time+pid is unique, even on systems where the pid
3696 can be re-used within our time interval. We can't shorten the interval without
3697 re-designing the message-id. See comments above where the message id is
3698 created. This is Something For The Future. */
3700 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3701 exim_wait_tick(&message_id_tv, id_resolution);
3703 /* Add data size to written header size. We do not count the initial file name
3704 that is in the file, but we do add one extra for the notional blank line that
3705 precedes the data. This total differs from message_size in that it include the
3706 added Received: header and any other headers that got created locally. */
3709 fstat(data_fd, &statbuf);
3711 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3713 /* Generate a "message received" log entry. We do this by building up a dynamic
3714 string as required. Since we commonly want to add two items at a time, use a
3715 macro to simplify the coding. We log the arrival of a new message while the
3716 file is still locked, just in case the machine is *really* fast, and delivers
3717 it first! Include any message id that is in the message - since the syntax of a
3718 message id is actually an addr-spec, we can use the parse routine to canonicize
3723 s = store_get(size);
3725 s = string_append(s, &size, &sptr, 2, US"<= ",
3726 (sender_address[0] == 0)? US"<>" : sender_address);
3727 if (message_reference != NULL)
3728 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3730 s = add_host_info_for_log(s, &size, &sptr);
3733 if (log_extra_selector & LX_tls_cipher && tls_in.cipher)
3734 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3735 if (log_extra_selector & LX_tls_certificate_verified && tls_in.cipher)
3736 s = string_append(s, &size, &sptr, 2, US" CV=",
3737 tls_in.certificate_verified? "yes":"no");
3738 if (log_extra_selector & LX_tls_peerdn && tls_in.peerdn)
3739 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3740 string_printing(tls_in.peerdn), US"\"");
3741 if (log_extra_selector & LX_tls_sni && tls_in.sni)
3742 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3743 string_printing(tls_in.sni), US"\"");
3746 if (sender_host_authenticated)
3748 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3749 if (authenticated_id != NULL)
3751 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3752 if (log_extra_selector & LX_smtp_mailauth && authenticated_sender != NULL)
3753 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3757 #ifndef DISABLE_PRDR
3759 s = string_append(s, &size, &sptr, 1, US" PRDR");
3762 #ifdef EXPERIMENTAL_PROXY
3763 if (proxy_session && log_extra_selector & LX_proxy)
3764 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_host_address);
3767 sprintf(CS big_buffer, "%d", msg_size);
3768 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3770 /* log 8BITMIME mode announced in MAIL_FROM
3774 if (log_extra_selector & LX_8bitmime)
3776 sprintf(CS big_buffer, "%d", body_8bitmime);
3777 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3780 /* If an addr-spec in a message-id contains a quoted string, it can contain
3781 any characters except " \ and CR and so in particular it can contain NL!
3782 Therefore, make sure we use a printing-characters only version for the log.
3783 Also, allow for domain literals in the message id. */
3785 if (msgid_header != NULL)
3788 BOOL save_allow_domain_literals = allow_domain_literals;
3789 allow_domain_literals = TRUE;
3790 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3791 &errmsg, &start, &end, &domain, FALSE);
3792 allow_domain_literals = save_allow_domain_literals;
3794 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3797 /* If subject logging is turned on, create suitable printing-character
3798 text. By expanding $h_subject: we make use of the MIME decoding. */
3800 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3803 uschar *p = big_buffer;
3804 uschar *ss = expand_string(US"$h_subject:");
3806 /* Backslash-quote any double quotes or backslashes so as to make a
3807 a C-like string, and turn any non-printers into escape sequences. */
3810 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3812 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3817 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3820 /* Terminate the string: string_cat() and string_append() leave room, but do
3821 not put the zero in. */
3825 /* Create a message log file if message logs are being used and this message is
3826 not blackholed. Write the reception stuff to it. We used to leave message log
3827 creation until the first delivery, but this has proved confusing for some
3830 if (message_logs && blackholed_by == NULL)
3834 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3836 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3838 if (fd < 0 && errno == ENOENT)
3841 sprintf(CS temp, "msglog/%s", message_subdir);
3842 if (message_subdir[0] == 0) temp[6] = 0;
3843 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3844 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3849 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3850 spool_name, strerror(errno));
3855 FILE *message_log = fdopen(fd, "a");
3856 if (message_log == NULL)
3858 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3859 spool_name, strerror(errno));
3864 uschar *now = tod_stamp(tod_log);
3865 fprintf(message_log, "%s Received from %s\n", now, s+3);
3866 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3868 if (queue_only_policy) fprintf(message_log,
3869 "%s no immediate delivery: queued by %s\n", now, queued_by);
3870 (void)fclose(message_log);
3875 /* Everything has now been done for a successful message except logging its
3876 arrival, and outputting an SMTP response. While writing to the log, set a flag
3877 to cause a call to receive_bomb_out() if the log cannot be opened. */
3879 receive_call_bombout = TRUE;
3881 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3882 connection has gone away. This can only be done if there is no unconsumed input
3883 waiting in the local input buffer. We can test for this by calling
3884 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3885 input to be sent following the final dot, so the presence of following input is
3888 If the connection is still present, but there is no unread input for the
3889 socket, the result of a select() call will be zero. If, however, the connection
3890 has gone away, or if there is pending input, the result of select() will be
3891 non-zero. The two cases can be distinguished by trying to read the next input
3892 character. If we succeed, we can unread it so that it remains in the local
3893 buffer for handling later. If not, the connection has been lost.
3895 Of course, since TCP/IP is asynchronous, there is always a chance that the
3896 connection will vanish between the time of this test and the sending of the
3897 response, but the chance of this happening should be small. */
3899 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3900 !receive_smtp_buffered())
3903 fd_set select_check;
3904 FD_ZERO(&select_check);
3905 FD_SET(fileno(smtp_in), &select_check);
3909 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3911 int c = (receive_getc)();
3912 if (c != EOF) (receive_ungetc)(c); else
3914 uschar *msg = US"SMTP connection lost after final dot";
3915 smtp_reply = US""; /* No attempt to send a response */
3916 smtp_yield = FALSE; /* Nothing more on this connection */
3918 /* Re-use the log line workspace */
3921 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3922 s = add_host_info_for_log(s, &size, &sptr);
3924 log_write(0, LOG_MAIN, "%s", s);
3926 /* Delete the files for this aborted message. */
3928 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3929 message_subdir, message_id);
3930 Uunlink(spool_name);
3932 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3933 message_subdir, message_id);
3934 Uunlink(spool_name);
3936 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3937 message_subdir, message_id);
3938 Uunlink(spool_name);
3945 /* The connection has not gone away; we really are going to take responsibility
3946 for this message. */
3948 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
3951 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
3952 the sender's dot (below).
3953 If rejected: copy response to sender, wipe the spooled files, log approriately.
3954 If temp-reject: accept to sender, keep the spooled files.
3956 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3958 XXX We do not handle queue-only, freezing, or blackholes.
3960 if(cutthrough_fd >= 0)
3962 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the messsage */
3963 /* Logging was done in finaldot() */
3966 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3967 cutthrough_done = ACCEPTED;
3968 break; /* message_id needed for SMTP accept below */
3970 default: /* Unknown response, or error. Treat as temp-reject. */
3971 case '4': /* Temp-reject. Keep spoolfiles and accept. */
3972 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
3973 break; /* message_id needed for SMTP accept below */
3975 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
3976 smtp_reply= msg; /* Pass on the exact error */
3977 cutthrough_done = PERM_REJ;
3982 #ifndef DISABLE_PRDR
3983 if(!smtp_reply || prdr_requested)
3988 log_write(0, LOG_MAIN |
3989 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3990 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3993 /* Log any control actions taken by an ACL or local_scan(). */
3995 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3996 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3997 "no immediate delivery: queued by %s", queued_by);
3999 receive_call_bombout = FALSE;
4001 store_reset(s); /* The store for the main log message can be reused */
4003 /* If the message is frozen, and freeze_tell is set, do the telling. */
4005 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4007 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4008 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4009 message_id, frozen_by, sender_address);
4013 /* Either a message has been successfully received and written to the two spool
4014 files, or an error in writing the spool has occurred for an SMTP message, or
4015 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4016 we will have already given up because there's no point in carrying on!) In
4017 either event, we must now close (and thereby unlock) the data file. In the
4018 successful case, this leaves the message on the spool, ready for delivery. In
4019 the error case, the spool file will be deleted. Then tidy up store, interact
4020 with an SMTP call if necessary, and return.
4022 A fflush() was done earlier in the expectation that any write errors on the
4023 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4024 possible for fclose() to fail - but what to do? What has happened to the lock
4029 process_info[process_info_len] = 0; /* Remove message id */
4030 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4032 /* Now reset signal handlers to their defaults */
4034 signal(SIGTERM, SIG_DFL);
4035 signal(SIGINT, SIG_DFL);
4037 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4038 value, which defaults TRUE - meaning there may be more incoming messages from
4039 this connection. For non-SMTP callers (where there is only ever one message),
4040 the default is FALSE. */
4046 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4047 is set to the response that should be sent. When it is NULL, we generate
4048 default responses. After an ACL error or local_scan() error, the response has
4049 already been sent, and smtp_reply is an empty string to indicate this. */
4051 if (!smtp_batched_input)
4053 if (smtp_reply == NULL)
4055 if (fake_response != OK)
4056 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4057 fake_response_text);
4059 /* An OK response is required; use "message" text if present. */
4061 else if (user_msg != NULL)
4063 uschar *code = US"250";
4065 smtp_message_code(&code, &len, &user_msg, NULL);
4066 smtp_respond(code, len, TRUE, user_msg);
4069 /* Default OK response */
4072 smtp_printf("250 OK id=%s\r\n", message_id);
4075 "\n**** SMTP testing: that is not a real message id!\n\n");
4078 /* smtp_reply is set non-empty */
4080 else if (smtp_reply[0] != 0)
4082 if (fake_response != OK && (smtp_reply[0] == '2'))
4083 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4084 fake_response_text);
4086 smtp_printf("%.1024s\r\n", smtp_reply);
4089 switch (cutthrough_done)
4091 case ACCEPTED: log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4092 case PERM_REJ: { /* Delete spool files */
4093 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
4094 message_subdir, message_id);
4095 Uunlink(spool_name);
4096 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
4097 message_subdir, message_id);
4098 Uunlink(spool_name);
4099 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
4100 message_subdir, message_id);
4101 Uunlink(spool_name);
4103 case TMP_REJ: message_id[0] = 0; /* Prevent a delivery from starting */
4106 cutthrough_delivery = FALSE;
4109 /* For batched SMTP, generate an error message on failure, and do
4110 nothing on success. The function moan_smtp_batch() does not return -
4111 it exits from the program with a non-zero return code. */
4113 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
4117 /* If blackholing, we can immediately log this message's sad fate. The data
4118 file has already been unlinked, and the header file was never written to disk.
4119 We must now indicate that nothing was received, to prevent a delivery from
4122 if (blackholed_by != NULL)
4124 uschar *detail = (local_scan_data != NULL)?
4125 string_printing(local_scan_data) :
4126 string_sprintf("(%s discarded recipients)", blackholed_by);
4127 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4128 log_write(0, LOG_MAIN, "Completed");
4132 /* Reset headers so that logging of rejects for a subsequent message doesn't
4133 include them. It is also important to set header_last = NULL before exiting
4134 from this function, as this prevents certain rewrites that might happen during
4135 subsequent verifying (of another incoming message) from trying to add headers
4136 when they shouldn't. */
4138 header_list = header_last = NULL;
4140 return yield; /* TRUE if more messages (SMTP only) */
4143 /* End of receive.c */