1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
12 #ifdef EXPERIMENTAL_DCC
16 #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++].errors_to = NULL;
506 /*************************************************
507 * Send user response message *
508 *************************************************/
510 /* This function is passed a default response code and a user message. It calls
511 smtp_message_code() to check and possibly modify the response code, and then
512 calls smtp_respond() to transmit the response. I put this into a function
513 just to avoid a lot of repetition.
516 code the response code
517 user_msg the user message
522 #ifdef EXPERIMENTAL_PRDR
524 smtp_user_msg(uschar *code, uschar *user_msg)
527 smtp_message_code(&code, &len, &user_msg, NULL);
528 smtp_respond(code, len, TRUE, user_msg);
536 /*************************************************
537 * Remove a recipient from the list *
538 *************************************************/
540 /* This function is provided for local_scan() to use.
543 recipient address to remove
545 Returns: TRUE if it did remove something; FALSE otherwise
549 receive_remove_recipient(uschar *recipient)
552 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
554 for (count = 0; count < recipients_count; count++)
556 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
558 if ((--recipients_count - count) > 0)
559 memmove(recipients_list + count, recipients_list + count + 1,
560 (recipients_count - count)*sizeof(recipient_item));
571 /*************************************************
572 * Read data portion of a non-SMTP message *
573 *************************************************/
575 /* This function is called to read the remainder of a message (following the
576 header) when the input is not from SMTP - we are receiving a local message on
577 a standard input stream. The message is always terminated by EOF, and is also
578 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
579 two cases for maximum efficiency.
581 Ensure that the body ends with a newline. This will naturally be the case when
582 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
583 as "sequences of lines" - this of course strictly applies only to SMTP, but
584 deliveries into BSD-type mailbox files also require it. Exim used to have a
585 flag for doing this at delivery time, but as it was always set for all
586 transports, I decided to simplify things by putting the check here instead.
588 There is at least one MUA (dtmail) that sends CRLF via this interface, and
589 other programs are known to do this as well. Exim used to have a option for
590 dealing with this: in July 2003, after much discussion, the code has been
591 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
593 However, for the case when a dot on a line by itself terminates a message, the
594 only recognized terminating sequences before and after the dot are LF and CRLF.
595 Otherwise, having read EOL . CR, you don't know whether to read another
598 Internally, in messages stored in Exim's spool files, LF is used as the line
599 terminator. Under the new regime, bare CRs will no longer appear in these
603 fout a FILE to which to write the message
605 Returns: One of the END_xxx values indicating why it stopped reading
609 read_message_data(FILE *fout)
613 register int linelength = 0;
615 /* Handle the case when only EOF terminates the message */
619 register int last_ch = '\n';
621 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
623 if (ch == 0) body_zerocount++;
624 if (last_ch == '\r' && ch != '\n')
626 if (linelength > max_received_linelength)
627 max_received_linelength = linelength;
629 if (fputc('\n', fout) == EOF) return END_WERROR;
633 if (ch == '\r') continue;
635 if (fputc(ch, fout) == EOF) return END_WERROR;
638 if (linelength > max_received_linelength)
639 max_received_linelength = linelength;
644 if (++message_size > thismessage_size_limit) return END_SIZE;
649 if (linelength > max_received_linelength)
650 max_received_linelength = linelength;
651 if (fputc('\n', fout) == EOF) return END_WERROR;
659 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
663 while ((ch = (receive_getc)()) != EOF)
665 if (ch == 0) body_zerocount++;
668 case 0: /* Normal state (previous char written) */
672 if (linelength > max_received_linelength)
673 max_received_linelength = linelength;
678 { ch_state = 2; continue; }
681 case 1: /* After written "\n" */
682 if (ch == '.') { ch_state = 3; continue; }
683 if (ch != '\n') ch_state = 0; else linelength = -1;
687 body_linecount++; /* After unwritten "\r" */
688 if (linelength > max_received_linelength)
689 max_received_linelength = linelength;
697 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
698 if (ch == '\r') continue;
704 case 3: /* After "\n." (\n written, dot not) */
705 if (ch == '\n') return END_DOT;
706 if (ch == '\r') { ch_state = 4; continue; }
709 if (fputc('.', fout) == EOF) return END_WERROR;
713 case 4: /* After "\n.\r" (\n written, rest not) */
714 if (ch == '\n') return END_DOT;
717 if (fputs(".\n", fout) == EOF) return END_WERROR;
718 if (ch == '\r') { ch_state = 2; continue; }
724 if (fputc(ch, fout) == EOF) return END_WERROR;
725 if (++message_size > thismessage_size_limit) return END_SIZE;
728 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
729 the message ends with a newline, and we must also write any characters that
730 were saved up while testing for an ending dot. */
734 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
735 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
736 message_size += Ustrlen(ends[ch_state]);
746 /*************************************************
747 * Read data portion of an SMTP message *
748 *************************************************/
750 /* This function is called to read the remainder of an SMTP message (after the
751 headers), or to skip over it when an error has occurred. In this case, the
752 output file is passed as NULL.
754 If any line begins with a dot, that character is skipped. The input should only
755 be successfully terminated by CR LF . CR LF unless it is local (non-network)
756 SMTP, in which case the CRs are optional, but...
758 FUDGE: It seems that sites on the net send out messages with just LF
759 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
760 we make the CRs optional in all cases.
762 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
763 well, so that there are no CRs in spooled messages. However, the message
764 terminating dot is not recognized between two bare CRs.
767 fout a FILE to which to write the message; NULL if skipping
769 Returns: One of the END_xxx values indicating why it stopped reading
773 read_message_data_smtp(FILE *fout)
777 register int linelength = 0;
779 while ((ch = (receive_getc)()) != EOF)
781 if (ch == 0) body_zerocount++;
784 case 0: /* After LF or CRLF */
788 continue; /* Don't ever write . after LF */
792 /* Else fall through to handle as normal uschar. */
794 case 1: /* Normal state */
799 if (linelength > max_received_linelength)
800 max_received_linelength = linelength;
810 case 2: /* After (unwritten) CR */
812 if (linelength > max_received_linelength)
813 max_received_linelength = linelength;
822 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
823 (void) cutthrough_put_nl();
824 if (ch != '\r') ch_state = 1; else continue;
828 case 3: /* After [CR] LF . */
836 ch_state = 1; /* The dot itself is removed */
839 case 4: /* After [CR] LF . CR */
840 if (ch == '\n') return END_DOT;
843 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
844 (void) cutthrough_put_nl();
854 /* Add the character to the spool file, unless skipping; then loop for the
861 if (fputc(ch, fout) == EOF) return END_WERROR;
862 if (message_size > thismessage_size_limit) return END_SIZE;
865 (void) cutthrough_put_nl();
869 (void) cutthrough_puts(&c, 1);
873 /* Fall through here if EOF encountered. This indicates some kind of error,
874 since a correct message is terminated by [CR] LF . [CR] LF. */
882 /*************************************************
883 * Swallow SMTP message *
884 *************************************************/
886 /* This function is called when there has been some kind of error while reading
887 an SMTP message, and the remaining data may need to be swallowed. It is global
888 because it is called from smtp_closedown() to shut down an incoming call
891 Argument: a FILE from which to read the message
896 receive_swallow_smtp(void)
898 if (message_ended >= END_NOTENDED)
899 message_ended = read_message_data_smtp(NULL);
904 /*************************************************
905 * Handle lost SMTP connection *
906 *************************************************/
908 /* This function logs connection loss incidents and generates an appropriate
911 Argument: additional data for the message
912 Returns: the SMTP response
916 handle_lost_connection(uschar *s)
918 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
919 "%s lost while reading message data%s", smtp_get_connection_info(), s);
920 return US"421 Lost incoming connection";
926 /*************************************************
927 * Handle a non-smtp reception error *
928 *************************************************/
930 /* This function is called for various errors during the reception of non-SMTP
931 messages. It either sends a message to the sender of the problem message, or it
932 writes to the standard error stream.
935 errcode code for moan_to_sender(), identifying the error
936 text1 first message text, passed to moan_to_sender()
937 text2 second message text, used only for stderrr
938 error_rc code to pass to exim_exit if no problem
939 f FILE containing body of message (may be stdin)
940 hptr pointer to instore headers or NULL
942 Returns: calls exim_exit(), which does not return
946 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
947 FILE *f, header_line *hptr)
949 if (error_handling == ERRORS_SENDER)
953 eblock.text1 = text1;
954 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
955 error_rc = EXIT_FAILURE;
957 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
964 /*************************************************
965 * Add header lines set up by ACL *
966 *************************************************/
968 /* This function is called to add the header lines that were set up by
969 statements in an ACL to the list of headers in memory. It is done in two stages
970 like this, because when the ACL for RCPT is running, the other headers have not
971 yet been received. This function is called twice; once just before running the
972 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
973 are visible to the DATA ACL.
975 Originally these header lines were added at the end. Now there is support for
976 three different places: top, bottom, and after the Received: header(s). There
977 will always be at least one Received: header, even if it is marked deleted, and
978 even if something else has been put in front of it.
981 acl_name text to identify which ACL
987 add_acl_headers(uschar *acl_name)
989 header_line *h, *next;
990 header_line *last_received = NULL;
992 if (acl_removed_headers != NULL)
994 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
996 for (h = header_list; h != NULL; h = h->next)
1001 if (h->type == htype_old) continue;
1003 include_header = TRUE;
1004 list = acl_removed_headers;
1006 int sep = ':'; /* This is specified as a colon-separated list */
1009 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer)))
1012 int len = Ustrlen(s);
1013 if (header_testname(h, s, len, FALSE))
1015 h->type = htype_old;
1016 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1020 acl_removed_headers = NULL;
1021 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1024 if (acl_added_headers == NULL) return;
1025 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1027 for (h = acl_added_headers; h != NULL; h = next)
1034 h->next = header_list;
1036 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1040 if (last_received == NULL)
1042 last_received = header_list;
1043 while (!header_testname(last_received, US"Received", 8, FALSE))
1044 last_received = last_received->next;
1045 while (last_received->next != NULL &&
1046 header_testname(last_received->next, US"Received", 8, FALSE))
1047 last_received = last_received->next;
1049 h->next = last_received->next;
1050 last_received->next = h;
1051 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1055 /* add header before any header which is NOT Received: or Resent- */
1056 last_received = header_list;
1057 while ( (last_received->next != NULL) &&
1058 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1059 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1060 last_received = last_received->next;
1061 /* last_received now points to the last Received: or Resent-* header
1062 in an uninterrupted chain of those header types (seen from the beginning
1063 of all headers. Our current header must follow it. */
1064 h->next = last_received->next;
1065 last_received->next = h;
1066 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1071 header_last->next = h;
1075 if (h->next == NULL) header_last = h;
1077 /* Check for one of the known header types (From:, To:, etc.) though in
1078 practice most added headers are going to be "other". Lower case
1079 identification letters are never stored with the header; they are used
1080 for existence tests when messages are received. So discard any lower case
1083 h->type = header_checkname(h, FALSE);
1084 if (h->type >= 'a') h->type = htype_other;
1086 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1089 acl_added_headers = NULL;
1090 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1095 /*************************************************
1096 * Add host information for log line *
1097 *************************************************/
1099 /* Called for acceptance and rejecting log lines. This adds information about
1100 the calling host to a string that is being built dynamically.
1103 s the dynamic string
1104 sizeptr points to the size variable
1105 ptrptr points to the pointer variable
1107 Returns: the extended string
1111 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1113 if (sender_fullhost != NULL)
1115 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1116 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1117 interface_address != NULL)
1119 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1121 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1124 if (sender_ident != NULL)
1125 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1126 if (received_protocol != NULL)
1127 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1133 #ifdef WITH_CONTENT_SCAN
1135 /*************************************************
1136 * Run the MIME ACL on a message *
1137 *************************************************/
1139 /* This code is in a subroutine so that it can be used for both SMTP
1140 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1143 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1144 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1145 smtp_reply_ptr Where SMTP reply is being built
1146 blackholed_by_ptr Where "blackholed by" message is being built
1148 Returns: TRUE to carry on; FALSE to abandon the message
1152 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1153 uschar **blackholed_by_ptr)
1156 uschar rfc822_file_path[2048];
1157 unsigned long mbox_size;
1158 header_line *my_headerlist;
1159 uschar *user_msg, *log_msg;
1160 int mime_part_count_buffer = -1;
1163 memset(CS rfc822_file_path,0,2048);
1165 /* check if it is a MIME message */
1166 my_headerlist = header_list;
1167 while (my_headerlist != NULL)
1169 /* skip deleted headers */
1170 if (my_headerlist->type == '*')
1172 my_headerlist = my_headerlist->next;
1175 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1177 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1180 my_headerlist = my_headerlist->next;
1183 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1187 /* make sure the eml mbox file is spooled up */
1188 mbox_file = spool_mbox(&mbox_size, NULL);
1189 if (mbox_file == NULL) {
1190 /* error while spooling */
1191 log_write(0, LOG_MAIN|LOG_PANIC,
1192 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1193 Uunlink(spool_name);
1195 #ifdef EXPERIMENTAL_DCC
1198 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1199 message_id[0] = 0; /* Indicate no message accepted */
1200 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1201 return FALSE; /* Indicate skip to end of receive function */
1207 mime_part_count = -1;
1208 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1209 (void)fclose(mbox_file);
1211 if (Ustrlen(rfc822_file_path) > 0)
1213 mime_part_count = mime_part_count_buffer;
1215 if (unlink(CS rfc822_file_path) == -1)
1217 log_write(0, LOG_PANIC,
1218 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1223 /* check if we must check any message/rfc822 attachments */
1226 uschar temp_path[1024];
1228 struct dirent *entry;
1231 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1234 tempdir = opendir(CS temp_path);
1238 entry = readdir(tempdir);
1239 if (entry == NULL) break;
1240 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
1242 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1243 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1251 mbox_file = Ufopen(rfc822_file_path,"rb");
1252 if (mbox_file == NULL)
1254 log_write(0, LOG_PANIC,
1255 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1256 unlink(CS rfc822_file_path);
1259 /* set RFC822 expansion variable */
1261 mime_part_count_buffer = mime_part_count;
1262 goto MIME_ACL_CHECK;
1267 add_acl_headers(US"MIME");
1270 recipients_count = 0;
1271 *blackholed_by_ptr = US"MIME ACL";
1275 Uunlink(spool_name);
1277 #ifdef EXPERIMENTAL_DCC
1280 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1281 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1282 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1283 message_id[0] = 0; /* Indicate no message accepted */
1284 return FALSE; /* Cause skip to end of receive function */
1290 #endif /* WITH_CONTENT_SCAN */
1295 received_header_gen(void)
1299 header_line *received_header= header_list;
1301 timestamp = expand_string(US"${tod_full}");
1302 if (recipients_count == 1) received_for = recipients_list[0].address;
1303 received = expand_string(received_header_text);
1304 received_for = NULL;
1306 if (received == NULL)
1308 if(spool_name[0] != 0)
1309 Uunlink(spool_name); /* Lose the data file */
1310 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1311 "(received_header_text) failed: %s", string_printing(received_header_text),
1312 expand_string_message);
1315 /* The first element on the header chain is reserved for the Received header,
1316 so all we have to do is fill in the text pointer, and set the type. However, if
1317 the result of the expansion is an empty string, we leave the header marked as
1318 "old" so as to refrain from adding a Received header. */
1320 if (received[0] == 0)
1322 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1323 received_header->type = htype_old;
1327 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1328 received_header->type = htype_received;
1331 received_header->slen = Ustrlen(received_header->text);
1333 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1334 received_header->type, received_header->text);
1339 /*************************************************
1341 *************************************************/
1343 /* Receive a message on the given input, and put it into a pair of spool files.
1344 Either a non-null list of recipients, or the extract flag will be true, or
1345 both. The flag sender_local is true for locally generated messages. The flag
1346 submission_mode is true if an ACL has obeyed "control = submission". The flag
1347 suppress_local_fixups is true if an ACL has obeyed "control =
1348 suppress_local_fixups" or -G was passed on the command-line.
1349 The flag smtp_input is true if the message is to be
1350 handled using SMTP conventions about termination and lines starting with dots.
1351 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1353 If a message was successfully read, message_id[0] will be non-zero.
1355 The general actions of this function are:
1357 . Read the headers of the message (if any) into a chain of store
1360 . If there is a "sender:" header and the message is locally originated,
1361 throw it away, unless the caller is trusted, or unless
1362 active_local_sender_retain is set - which can only happen if
1363 active_local_from_check is false.
1365 . If recipients are to be extracted from the message, build the
1366 recipients list from the headers, removing any that were on the
1367 original recipients list (unless extract_addresses_remove_arguments is
1368 false), and at the same time, remove any bcc header that may be present.
1370 . Get the spool file for the data, sort out its unique name, open
1371 and lock it (but don't give it the name yet).
1373 . Generate a "Message-Id" header if the message doesn't have one, for
1374 locally-originated messages.
1376 . Generate a "Received" header.
1378 . Ensure the recipients list is fully qualified and rewritten if necessary.
1380 . If there are any rewriting rules, apply them to the sender address
1381 and also to the headers.
1383 . If there is no from: header, generate one, for locally-generated messages
1384 and messages in "submission mode" only.
1386 . If the sender is local, check that from: is correct, and if not, generate
1387 a Sender: header, unless message comes from a trusted caller, or this
1388 feature is disabled by active_local_from_check being false.
1390 . If there is no "date" header, generate one, for locally-originated
1391 or submission mode messages only.
1393 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1394 dot_ends mode, to the data file. Leave it open, to hold the lock.
1396 . Write the envelope and the headers to a new file.
1398 . Set the name for the header file; close it.
1400 . Set the name for the data file; close it.
1402 Because this function can potentially be called many times in a single
1403 SMTP connection, all store should be got by store_get(), so that it will be
1404 automatically retrieved after the message is accepted.
1406 FUDGE: It seems that sites on the net send out messages with just LF
1407 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1408 we make the CRs optional in all cases.
1410 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1411 new regime is now in place in which bare CRs in header lines are turned into LF
1412 followed by a space, so as not to terminate the header line.
1414 February 2004: A bare LF in a header line in a message whose first line was
1415 terminated by CRLF is treated in the same way as a bare CR.
1418 extract_recip TRUE if recipients are to be extracted from the message's
1421 Returns: TRUE there are more messages to be read (SMTP input)
1422 FALSE there are no more messages to be read (non-SMTP input
1423 or SMTP connection collapsed, or other failure)
1425 When reading a message for filter testing, the returned value indicates
1426 whether the headers (which is all that is read) were terminated by '.' or
1430 receive_msg(BOOL extract_recip)
1435 int process_info_len = Ustrlen(process_info);
1436 int error_rc = (error_handling == ERRORS_SENDER)?
1437 errors_sender_rc : EXIT_FAILURE;
1438 int header_size = 256;
1439 int start, end, domain, size, sptr;
1442 int prevlines_length = 0;
1444 register int ptr = 0;
1446 BOOL contains_resent_headers = FALSE;
1447 BOOL extracted_ignored = FALSE;
1448 BOOL first_line_ended_crlf = TRUE_UNSET;
1449 BOOL smtp_yield = TRUE;
1452 BOOL resents_exist = FALSE;
1453 uschar *resent_prefix = US"";
1454 uschar *blackholed_by = NULL;
1455 uschar *blackhole_log_msg = US"";
1456 int cutthrough_done = 0;
1459 error_block *bad_addresses = NULL;
1461 uschar *frozen_by = NULL;
1462 uschar *queued_by = NULL;
1465 struct stat statbuf;
1467 /* Final message to give to SMTP caller, and messages from ACLs */
1469 uschar *smtp_reply = NULL;
1470 uschar *user_msg, *log_msg;
1472 /* Working header pointers */
1474 header_line *h, *next;
1476 /* Flags for noting the existence of certain headers (only one left) */
1478 BOOL date_header_exists = FALSE;
1480 /* Pointers to receive the addresses of headers whose contents we need. */
1482 header_line *from_header = NULL;
1483 header_line *subject_header = NULL;
1484 header_line *msgid_header = NULL;
1485 header_line *received_header;
1487 #ifdef EXPERIMENTAL_DMARC
1489 #endif /* EXPERIMENTAL_DMARC */
1491 /* Variables for use when building the Received: header. */
1496 /* Release any open files that might have been cached while preparing to
1497 accept the message - e.g. by verifying addresses - because reading a message
1498 might take a fair bit of real time. */
1502 /* Extracting the recipient list from an input file is incompatible with
1503 cutthrough delivery with the no-spool option. It shouldn't be possible
1504 to set up the combination, but just in case kill any ongoing connection. */
1505 if (extract_recip || !smtp_input)
1506 cancel_cutthrough_connection("not smtp input");
1508 /* Initialize the chain of headers by setting up a place-holder for Received:
1509 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1510 pointing to the end of the chain to make adding headers simple. */
1512 received_header = header_list = header_last = store_get(sizeof(header_line));
1513 header_list->next = NULL;
1514 header_list->type = htype_old;
1515 header_list->text = NULL;
1516 header_list->slen = 0;
1518 /* Control block for the next header to be read. */
1520 next = store_get(sizeof(header_line));
1521 next->text = store_get(header_size);
1523 /* Initialize message id to be null (indicating no message read), and the
1524 header names list to be the normal list. Indicate there is no data file open
1525 yet, initialize the size and warning count, and deal with no size limit. */
1533 received_count = 1; /* For the one we will add */
1535 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1537 /* While reading the message, the following counts are computed. */
1539 message_linecount = body_linecount = body_zerocount =
1540 max_received_linelength = 0;
1542 #ifndef DISABLE_DKIM
1543 /* Call into DKIM to set up the context. */
1544 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1547 #ifdef EXPERIMENTAL_DMARC
1548 /* initialize libopendmarc */
1549 dmarc_up = dmarc_init();
1552 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1553 ids, and fractions of a second are required. See the comments that precede the
1554 message id creation below. */
1556 (void)gettimeofday(&message_id_tv, NULL);
1558 /* For other uses of the received time we can operate with granularity of one
1559 second, and for that we use the global variable received_time. This is for
1560 things like ultimate message timeouts. */
1562 received_time = message_id_tv.tv_sec;
1564 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1565 happen in the smtp_getc() function when it refills its buffer. */
1567 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1569 /* If not SMTP input, timeout happens only if configured, and we just set a
1570 single timeout for the whole message. */
1572 else if (receive_timeout > 0)
1574 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1575 alarm(receive_timeout);
1578 /* SIGTERM and SIGINT are caught always. */
1580 signal(SIGTERM, data_sigterm_sigint_handler);
1581 signal(SIGINT, data_sigterm_sigint_handler);
1583 /* Header lines in messages are not supposed to be very long, though when
1584 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1585 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1586 storing the header, and extend this as necessary using string_cat().
1588 To cope with total lunacies, impose an upper limit on the length of the header
1589 section of the message, as otherwise the store will fill up. We must also cope
1590 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1591 Folded header lines are joined into one string, leaving the '\n' characters
1592 inside them, so that writing them out reproduces the input.
1594 Loop for each character of each header; the next structure for chaining the
1595 header is set up already, with ptr the offset of the next character in
1600 int ch = (receive_getc)();
1602 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1603 SMTP must have a correct "." terminator. */
1605 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1607 smtp_reply = handle_lost_connection(US" (header)");
1609 goto TIDYUP; /* Skip to end of function */
1612 /* See if we are at the current header's size limit - there must be at least
1613 four bytes left. This allows for the new character plus a zero, plus two for
1614 extra insertions when we are playing games with dots and carriage returns. If
1615 we are at the limit, extend the text buffer. This could have been done
1616 automatically using string_cat() but because this is a tightish loop storing
1617 only one character at a time, we choose to do it inline. Normally
1618 store_extend() will be able to extend the block; only at the end of a big
1619 store block will a copy be needed. To handle the case of very long headers
1620 (and sometimes lunatic messages can have ones that are 100s of K long) we
1621 call store_release() for strings that have been copied - if the string is at
1622 the start of a block (and therefore the only thing in it, because we aren't
1623 doing any other gets), the block gets freed. We can only do this because we
1624 know there are no other calls to store_get() going on. */
1626 if (ptr >= header_size - 4)
1628 int oldsize = header_size;
1629 /* header_size += 256; */
1631 if (!store_extend(next->text, oldsize, header_size))
1633 uschar *newtext = store_get(header_size);
1634 memcpy(newtext, next->text, ptr);
1635 store_release(next->text);
1636 next->text = newtext;
1640 /* Cope with receiving a binary zero. There is dispute about whether
1641 these should be allowed in RFC 822 messages. The middle view is that they
1642 should not be allowed in headers, at least. Exim takes this attitude at
1643 the moment. We can't just stomp on them here, because we don't know that
1644 this line is a header yet. Set a flag to cause scanning later. */
1646 if (ch == 0) had_zero++;
1648 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1649 those from data files use just LF. Treat LF in local SMTP input as a
1650 terminator too. Treat EOF as a line terminator always. */
1652 if (ch == EOF) goto EOL;
1654 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1655 other MTAs accept this. We are therefore forced into this "liberalisation"
1656 too, so we accept LF as a line terminator whatever the source of the message.
1657 However, if the first line of the message ended with a CRLF, we treat a bare
1658 LF specially by inserting a white space after it to ensure that the header
1659 line is not terminated. */
1663 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1664 else if (first_line_ended_crlf) receive_ungetc(' ');
1668 /* This is not the end of the line. If this is SMTP input and this is
1669 the first character in the line and it is a "." character, ignore it.
1670 This implements the dot-doubling rule, though header lines starting with
1671 dots aren't exactly common. They are legal in RFC 822, though. If the
1672 following is CRLF or LF, this is the line that that terminates the
1673 entire message. We set message_ended to indicate this has happened (to
1674 prevent further reading), and break out of the loop, having freed the
1675 empty header, and set next = NULL to indicate no data line. */
1677 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1679 ch = (receive_getc)();
1682 ch = (receive_getc)();
1686 ch = '\r'; /* Revert to CR */
1691 message_ended = END_DOT;
1694 break; /* End character-reading loop */
1697 /* For non-SMTP input, the dot at the start of the line was really a data
1698 character. What is now in ch is the following character. We guaranteed
1699 enough space for this above. */
1703 next->text[ptr++] = '.';
1708 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1709 remember this case if this is the first line ending. */
1713 ch = (receive_getc)();
1716 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1720 /* Otherwise, put back the character after CR, and turn the bare CR
1723 ch = (receive_ungetc)(ch);
1724 next->text[ptr++] = '\n';
1729 /* We have a data character for the header line. */
1731 next->text[ptr++] = ch; /* Add to buffer */
1732 message_size++; /* Total message size so far */
1734 /* Handle failure due to a humungously long header section. The >= allows
1735 for the terminating \n. Add what we have so far onto the headers list so
1736 that it gets reflected in any error message, and back up the just-read
1739 if (message_size >= header_maxsize)
1741 next->text[ptr] = 0;
1743 next->type = htype_other;
1745 header_last->next = next;
1748 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1749 "%s (more than %d characters): message abandoned",
1750 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1754 smtp_reply = US"552 Message header is ridiculously long";
1755 receive_swallow_smtp();
1756 goto TIDYUP; /* Skip to end of function */
1761 give_local_error(ERRMESS_VLONGHEADER,
1762 string_sprintf("message header longer than %d characters received: "
1763 "message not accepted", header_maxsize), US"", error_rc, stdin,
1765 /* Does not return */
1769 continue; /* With next input character */
1771 /* End of header line reached */
1775 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1777 receive_linecount++;
1778 message_linecount++;
1780 /* Keep track of maximum line length */
1782 if (ptr - prevlines_length > max_received_linelength)
1783 max_received_linelength = ptr - prevlines_length;
1784 prevlines_length = ptr + 1;
1786 /* Now put in the terminating newline. There is always space for
1787 at least two more characters. */
1789 next->text[ptr++] = '\n';
1792 /* A blank line signals the end of the headers; release the unwanted
1793 space and set next to NULL to indicate this. */
1802 /* There is data in the line; see if the next input character is a
1803 whitespace character. If it is, we have a continuation of this header line.
1804 There is always space for at least one character at this point. */
1808 int nextch = (receive_getc)();
1809 if (nextch == ' ' || nextch == '\t')
1811 next->text[ptr++] = nextch;
1813 continue; /* Iterate the loop */
1815 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1816 else ch = EOF; /* Cause main loop to exit at end */
1819 /* We have got to the real line end. Terminate the string and release store
1820 beyond it. If it turns out to be a real header, internal binary zeros will
1821 be squashed later. */
1823 next->text[ptr] = 0;
1825 store_reset(next->text + ptr + 1);
1827 /* Check the running total size against the overall message size limit. We
1828 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1829 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1830 headers - the code to read the body will then also hit the buffer. */
1832 if (message_size > thismessage_size_limit) break;
1834 /* A line that is not syntactically correct for a header also marks
1835 the end of the headers. In this case, we leave next containing the
1836 first data line. This might actually be several lines because of the
1837 continuation logic applied above, but that doesn't matter.
1839 It turns out that smail, and presumably sendmail, accept leading lines
1842 From ph10 Fri Jan 5 12:35 GMT 1996
1844 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1845 find any documentation of this, but for compatibility it had better be
1846 accepted. Exim restricts it to the case of non-smtp messages, and
1847 treats it as an alternative to the -f command line option. Thus it is
1848 ignored except for trusted users or filter testing. Otherwise it is taken
1849 as the sender address, unless -f was used (sendmail compatibility).
1851 It further turns out that some UUCPs generate the From_line in a different
1854 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1856 The regex for matching these things is now capable of recognizing both
1857 formats (including 2- and 4-digit years in the latter). In fact, the regex
1858 is now configurable, as is the expansion string to fish out the sender.
1860 Even further on it has been discovered that some broken clients send
1861 these lines in SMTP messages. There is now an option to ignore them from
1862 specified hosts or networks. Sigh. */
1864 if (header_last == header_list &&
1867 (sender_host_address != NULL &&
1868 verify_check_host(&ignore_fromline_hosts) == OK)
1870 (sender_host_address == NULL && ignore_fromline_local)
1872 regex_match_and_setup(regex_From, next->text, 0, -1))
1874 if (!sender_address_forced)
1876 uschar *uucp_sender = expand_string(uucp_from_sender);
1877 if (uucp_sender == NULL)
1879 log_write(0, LOG_MAIN|LOG_PANIC,
1880 "expansion of \"%s\" failed after matching "
1881 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1885 int start, end, domain;
1887 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1888 &start, &end, &domain, TRUE);
1889 if (newsender != NULL)
1891 if (domain == 0 && newsender[0] != 0)
1892 newsender = rewrite_address_qualify(newsender, FALSE);
1894 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1896 sender_address = newsender;
1898 if (trusted_caller || filter_test != FTEST_NONE)
1900 authenticated_sender = NULL;
1901 originator_name = US"";
1902 sender_local = FALSE;
1905 if (filter_test != FTEST_NONE)
1906 printf("Sender taken from \"From \" line\n");
1913 /* Not a leading "From " line. Check to see if it is a valid header line.
1914 Header names may contain any non-control characters except space and colon,
1919 uschar *p = next->text;
1921 /* If not a valid header line, break from the header reading loop, leaving
1922 next != NULL, indicating that it holds the first line of the body. */
1924 if (isspace(*p)) break;
1925 while (mac_isgraph(*p) && *p != ':') p++;
1926 while (isspace(*p)) p++;
1929 body_zerocount = had_zero;
1933 /* We have a valid header line. If there were any binary zeroes in
1934 the line, stomp on them here. */
1937 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1939 /* It is perfectly legal to have an empty continuation line
1940 at the end of a header, but it is confusing to humans
1941 looking at such messages, since it looks like a blank line.
1942 Reduce confusion by removing redundant white space at the
1943 end. We know that there is at least one printing character
1944 (the ':' tested for above) so there is no danger of running
1947 p = next->text + ptr - 2;
1950 while (*p == ' ' || *p == '\t') p--;
1951 if (*p != '\n') break;
1952 ptr = (p--) - next->text + 1;
1953 message_size -= next->slen - ptr;
1954 next->text[ptr] = 0;
1958 /* Add the header to the chain */
1960 next->type = htype_other;
1962 header_last->next = next;
1965 /* Check the limit for individual line lengths. This comes after adding to
1966 the chain so that the failing line is reflected if a bounce is generated
1967 (for a local message). */
1969 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1971 log_write(0, LOG_MAIN, "overlong message header line received from "
1972 "%s (more than %d characters): message abandoned",
1973 sender_host_unknown? sender_ident : sender_fullhost,
1974 header_line_maxsize);
1978 smtp_reply = US"552 A message header line is too long";
1979 receive_swallow_smtp();
1980 goto TIDYUP; /* Skip to end of function */
1985 give_local_error(ERRMESS_VLONGHDRLINE,
1986 string_sprintf("message header line longer than %d characters "
1987 "received: message not accepted", header_line_maxsize), US"",
1988 error_rc, stdin, header_list->next);
1989 /* Does not return */
1993 /* Note if any resent- fields exist. */
1995 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1997 resents_exist = TRUE;
1998 resent_prefix = US"Resent-";
2002 /* The line has been handled. If we have hit EOF, break out of the loop,
2003 indicating no pending data line. */
2005 if (ch == EOF) { next = NULL; break; }
2007 /* Set up for the next header */
2010 next = store_get(sizeof(header_line));
2011 next->text = store_get(header_size);
2014 prevlines_length = 0;
2015 } /* Continue, starting to read the next header */
2017 /* At this point, we have read all the headers into a data structure in main
2018 store. The first header is still the dummy placeholder for the Received: header
2019 we are going to generate a bit later on. If next != NULL, it contains the first
2020 data line - which terminated the headers before reaching a blank line (not the
2025 debug_printf(">>Headers received:\n");
2026 for (h = header_list->next; h != NULL; h = h->next)
2027 debug_printf("%s", h->text);
2031 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2032 is dropped immediately after valid headers, the next thing we will see is EOF.
2033 We must test for this specially, as further down the reading of the data is
2034 skipped if already at EOF. */
2036 if (smtp_input && (receive_feof)())
2038 smtp_reply = handle_lost_connection(US" (after header)");
2040 goto TIDYUP; /* Skip to end of function */
2043 /* If this is a filter test run and no headers were read, output a warning
2044 in case there is a mistake in the test message. */
2046 if (filter_test != FTEST_NONE && header_list->next == NULL)
2047 printf("Warning: no message headers read\n");
2050 /* Scan the headers to identify them. Some are merely marked for later
2051 processing; some are dealt with here. */
2053 for (h = header_list->next; h != NULL; h = h->next)
2055 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2056 if (is_resent) contains_resent_headers = TRUE;
2058 switch (header_checkname(h, is_resent))
2061 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2065 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2068 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2071 if (!resents_exist || is_resent) date_header_exists = TRUE;
2074 /* Same comments as about Return-Path: below. */
2076 case htype_delivery_date:
2077 if (delivery_date_remove) h->type = htype_old;
2080 /* Same comments as about Return-Path: below. */
2082 case htype_envelope_to:
2083 if (envelope_to_remove) h->type = htype_old;
2086 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2087 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2088 header consists of just the login id of the user who called Exim, rewrite
2089 it with the gecos field first. Apply this rule to Resent-From: if there
2090 are resent- fields. */
2093 h->type = htype_from;
2094 if (!resents_exist || is_resent)
2100 uschar *s = Ustrchr(h->text, ':') + 1;
2101 while (isspace(*s)) s++;
2102 len = h->slen - (s - h->text) - 1;
2103 if (Ustrlen(originator_login) == len &&
2104 strncmpic(s, originator_login, len) == 0)
2106 uschar *name = is_resent? US"Resent-From" : US"From";
2107 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2108 originator_login, qualify_domain_sender);
2109 from_header = header_last;
2110 h->type = htype_old;
2111 DEBUG(D_receive|D_rewrite)
2112 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2118 /* Identify the Message-id: header for generating "in-reply-to" in the
2119 autoreply transport. For incoming logging, save any resent- value. In both
2120 cases, take just the first of any multiples. */
2123 if (msgid_header == NULL && (!resents_exist || is_resent))
2130 /* Flag all Received: headers */
2132 case htype_received:
2133 h->type = htype_received;
2137 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2139 case htype_reply_to:
2140 h->type = htype_reply_to;
2143 /* The Return-path: header is supposed to be added to messages when
2144 they leave the SMTP system. We shouldn't receive messages that already
2145 contain Return-path. However, since Exim generates Return-path: on
2146 local delivery, resent messages may well contain it. We therefore
2147 provide an option (which defaults on) to remove any Return-path: headers
2148 on input. Removal actually means flagging as "old", which prevents the
2149 header being transmitted with the message. */
2151 case htype_return_path:
2152 if (return_path_remove) h->type = htype_old;
2154 /* If we are testing a mail filter file, use the value of the
2155 Return-Path: header to set up the return_path variable, which is not
2156 otherwise set. However, remove any <> that surround the address
2157 because the variable doesn't have these. */
2159 if (filter_test != FTEST_NONE)
2161 uschar *start = h->text + 12;
2162 uschar *end = start + Ustrlen(start);
2163 while (isspace(*start)) start++;
2164 while (end > start && isspace(end[-1])) end--;
2165 if (*start == '<' && end[-1] == '>')
2170 return_path = string_copyn(start, end - start);
2171 printf("Return-path taken from \"Return-path:\" header line\n");
2175 /* If there is a "Sender:" header and the message is locally originated,
2176 and from an untrusted caller and suppress_local_fixups is not set, or if we
2177 are in submission mode for a remote message, mark it "old" so that it will
2178 not be transmitted with the message, unless active_local_sender_retain is
2179 set. (This can only be true if active_local_from_check is false.) If there
2180 are any resent- headers in the message, apply this rule to Resent-Sender:
2181 instead of Sender:. Messages with multiple resent- header sets cannot be
2182 tidily handled. (For this reason, at least one MUA - Pine - turns old
2183 resent- headers into X-resent- headers when resending, leaving just one
2187 h->type = ((!active_local_sender_retain &&
2189 (sender_local && !trusted_caller && !suppress_local_fixups)
2193 (!resents_exist||is_resent))?
2194 htype_old : htype_sender;
2197 /* Remember the Subject: header for logging. There is no Resent-Subject */
2203 /* "To:" gets flagged, and the existence of a recipient header is noted,
2204 whether it's resent- or not. */
2209 to_or_cc_header_exists = TRUE;
2215 /* Extract recipients from the headers if that is required (the -t option).
2216 Note that this is documented as being done *before* any address rewriting takes
2217 place. There are two possibilities:
2219 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2220 recipients already listed are to be REMOVED from the message. Smail 3 works
2221 like this. We need to build a non-recipients tree for that list, because in
2222 subsequent processing this data is held in a tree and that's what the
2223 spool_write_header() function expects. Make sure that non-recipient addresses
2224 are fully qualified and rewritten if necessary.
2226 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2227 those in the command line arguments (and it is rumoured some other MTAs do
2228 this). Therefore, there is an option to make Exim behave this way.
2230 *** Notes on "Resent-" header lines ***
2232 The presence of resent-headers in the message makes -t horribly ambiguous.
2233 Experiments with sendmail showed that it uses recipients for all resent-
2234 headers, totally ignoring the concept of "sets of resent- headers" as described
2235 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2236 with all the addresses in one instance of each header.
2238 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2239 error for -t if there were resent- headers in the message. However, after a
2240 discussion on the mailing list, I've learned that there are MUAs that use
2241 resent- headers with -t, and also that the stuff about sets of resent- headers
2242 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2243 message with -t and resent- header lines makes sure that only *its* resent-
2244 headers are present; previous ones are often renamed as X-resent- for example.
2246 Consequently, Exim has been changed so that, if any resent- header lines are
2247 present, the recipients are taken from all of the appropriate resent- lines,
2248 and not from the ordinary To:, Cc:, etc. */
2253 error_block **bnext = &bad_addresses;
2255 if (extract_addresses_remove_arguments)
2257 while (recipients_count-- > 0)
2259 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2260 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2261 tree_add_nonrecipient(s);
2263 recipients_list = NULL;
2264 recipients_count = recipients_list_max = 0;
2267 /* Now scan the headers */
2269 for (h = header_list->next; h != NULL; h = h->next)
2271 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2272 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2274 uschar *s = Ustrchr(h->text, ':') + 1;
2275 while (isspace(*s)) s++;
2277 parse_allow_group = TRUE; /* Allow address group syntax */
2281 uschar *ss = parse_find_address_end(s, FALSE);
2282 uschar *recipient, *errmess, *p, *pp;
2283 int start, end, domain;
2285 /* Check on maximum */
2287 if (recipients_max > 0 && ++rcount > recipients_max)
2289 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2290 US"message rejected: ", error_rc, stdin, NULL);
2291 /* Does not return */
2294 /* Make a copy of the address, and remove any internal newlines. These
2295 may be present as a result of continuations of the header line. The
2296 white space that follows the newline must not be removed - it is part
2299 pp = recipient = store_get(ss - s + 1);
2300 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2302 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2305 /* Keep a list of all the bad addresses so we can send a single
2306 error message at the end. However, an empty address is not an error;
2307 just ignore it. This can come from an empty group list like
2309 To: Recipients of list:;
2311 If there are no recipients at all, an error will occur later. */
2313 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2315 int len = Ustrlen(s);
2316 error_block *b = store_get(sizeof(error_block));
2317 while (len > 0 && isspace(s[len-1])) len--;
2319 b->text1 = string_printing(string_copyn(s, len));
2325 /* If the recipient is already in the nonrecipients tree, it must
2326 have appeared on the command line with the option extract_addresses_
2327 remove_arguments set. Do not add it to the recipients, and keep a note
2328 that this has happened, in order to give a better error if there are
2329 no recipients left. */
2331 else if (recipient != NULL)
2333 if (tree_search(tree_nonrecipients, recipient) == NULL)
2334 receive_add_recipient(recipient, -1);
2336 extracted_ignored = TRUE;
2339 /* Move on past this address */
2341 s = ss + (*ss? 1:0);
2342 while (isspace(*s)) s++;
2343 } /* Next address */
2345 parse_allow_group = FALSE; /* Reset group syntax flags */
2346 parse_found_group = FALSE;
2348 /* If this was the bcc: header, mark it "old", which means it
2349 will be kept on the spool, but not transmitted as part of the
2352 if (h->type == htype_bcc) h->type = htype_old;
2353 } /* For appropriate header line */
2354 } /* For each header line */
2358 /* Now build the unique message id. This has changed several times over the
2359 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2360 Retaining all the history in the comment has become too unwieldy - read
2361 previous release sources if you want it.
2363 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2364 The first part is the current time, in seconds. The second part is the current
2365 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2366 can hold a number in the range 0-3843. It used to be a computed sequence
2367 number, but is now the fractional component of the current time in units of
2368 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2369 received, Exim ensures that the timer has ticked at the appropriate level
2370 before proceeding, to avoid duplication if the pid happened to be re-used
2371 within the same time period. It seems likely that most messages will take at
2372 least half a millisecond to be received, so no delay will normally be
2373 necessary. At least for some time...
2375 There is a modification when localhost_number is set. Formerly this was allowed
2376 to be as large as 255. Now it is restricted to the range 0-16, and the final
2377 component of the message id becomes (localhost_number * 200) + fractional time
2378 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2380 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2381 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2382 still allows the tttttt field to hold a large enough number to last for some
2383 more decades, and the final two-digit field can hold numbers up to 1295, which
2384 is enough for milliseconds (instead of 1/2000 of a second).
2386 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2387 pid, so it is probably safe because pids have to be positive. The
2388 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2389 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2391 Note that string_base62() returns its data in a static storage block, so it
2392 must be copied before calling string_base62() again. It always returns exactly
2395 There doesn't seem to be anything in the RFC which requires a message id to
2396 start with a letter, but Smail was changed to ensure this. The external form of
2397 the message id (as supplied by string expansion) therefore starts with an
2398 additional leading 'E'. The spool file names do not include this leading
2399 letter and it is not used internally.
2401 NOTE: If ever the format of message ids is changed, the regular expression for
2402 checking that a string is in this format must be updated in a corresponding
2403 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2404 must also be changed to reflect the correct string length. Then, of course,
2405 other programs that rely on the message id format will need updating too. */
2407 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2408 message_id[6] = '-';
2409 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2411 /* Deal with the case where the host number is set. The value of the number was
2412 checked when it was read, to ensure it isn't too big. The timing granularity is
2413 left in id_resolution so that an appropriate wait can be done after receiving
2414 the message, if necessary (we hope it won't be). */
2416 if (host_number_string != NULL)
2418 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2419 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2420 string_base62((long int)(
2421 host_number * (1000000/id_resolution) +
2422 message_id_tv.tv_usec/id_resolution)) + 4);
2425 /* Host number not set: final field is just the fractional time at an
2426 appropriate resolution. */
2430 id_resolution = (BASE_62 == 62)? 500 : 1000;
2431 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2432 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2435 /* Add the current message id onto the current process info string if
2438 (void)string_format(process_info + process_info_len,
2439 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2441 /* If we are using multiple input directories, set up the one for this message
2442 to be the least significant base-62 digit of the time of arrival. Otherwise
2443 ensure that it is an empty string. */
2445 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2447 /* Now that we have the message-id, if there is no message-id: header, generate
2448 one, but only for local (without suppress_local_fixups) or submission mode
2449 messages. This can be user-configured if required, but we had better flatten
2450 any illegal characters therein. */
2452 if (msgid_header == NULL &&
2453 ((sender_host_address == NULL && !suppress_local_fixups)
2454 || submission_mode))
2457 uschar *id_text = US"";
2458 uschar *id_domain = primary_hostname;
2460 /* Permit only letters, digits, dots, and hyphens in the domain */
2462 if (message_id_domain != NULL)
2464 uschar *new_id_domain = expand_string(message_id_domain);
2465 if (new_id_domain == NULL)
2467 if (!expand_string_forcedfail)
2468 log_write(0, LOG_MAIN|LOG_PANIC,
2469 "expansion of \"%s\" (message_id_header_domain) "
2470 "failed: %s", message_id_domain, expand_string_message);
2472 else if (*new_id_domain != 0)
2474 id_domain = new_id_domain;
2475 for (p = id_domain; *p != 0; p++)
2476 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2480 /* Permit all characters except controls and RFC 2822 specials in the
2481 additional text part. */
2483 if (message_id_text != NULL)
2485 uschar *new_id_text = expand_string(message_id_text);
2486 if (new_id_text == NULL)
2488 if (!expand_string_forcedfail)
2489 log_write(0, LOG_MAIN|LOG_PANIC,
2490 "expansion of \"%s\" (message_id_header_text) "
2491 "failed: %s", message_id_text, expand_string_message);
2493 else if (*new_id_text != 0)
2495 id_text = new_id_text;
2496 for (p = id_text; *p != 0; p++)
2497 if (mac_iscntrl_or_special(*p)) *p = '-';
2501 /* Add the header line
2502 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2503 * appended, to preserve classical expectations of header ordering. */
2505 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2506 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2507 (*id_text == 0)? "" : ".", id_text, id_domain);
2510 /* If we are to log recipients, keep a copy of the raw ones before any possible
2511 rewriting. Must copy the count, because later ACLs and the local_scan()
2512 function may mess with the real recipients. */
2514 if ((log_extra_selector & LX_received_recipients) != 0)
2516 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2517 for (i = 0; i < recipients_count; i++)
2518 raw_recipients[i] = string_copy(recipients_list[i].address);
2519 raw_recipients_count = recipients_count;
2522 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2523 recipients will get here only if the conditions were right (allow_unqualified_
2524 recipient is TRUE). */
2526 for (i = 0; i < recipients_count; i++)
2527 recipients_list[i].address =
2528 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2529 global_rewrite_rules, rewrite_existflags);
2531 /* If there is no From: header, generate one for local (without
2532 suppress_local_fixups) or submission_mode messages. If there is no sender
2533 address, but the sender is local or this is a local delivery error, use the
2534 originator login. This shouldn't happen for genuine bounces, but might happen
2535 for autoreplies. The addition of From: must be done *before* checking for the
2536 possible addition of a Sender: header, because untrusted_set_sender allows an
2537 untrusted user to set anything in the envelope (which might then get info
2538 From:) but we still want to ensure a valid Sender: if it is required. */
2540 if (from_header == NULL &&
2541 ((sender_host_address == NULL && !suppress_local_fixups)
2542 || submission_mode))
2544 uschar *oname = US"";
2546 /* Use the originator_name if this is a locally submitted message and the
2547 caller is not trusted. For trusted callers, use it only if -F was used to
2548 force its value or if we have a non-SMTP message for which -f was not used
2549 to set the sender. */
2551 if (sender_host_address == NULL)
2553 if (!trusted_caller || sender_name_forced ||
2554 (!smtp_input && !sender_address_forced))
2555 oname = originator_name;
2558 /* For non-locally submitted messages, the only time we use the originator
2559 name is when it was forced by the /name= option on control=submission. */
2563 if (submission_name != NULL) oname = submission_name;
2566 /* Envelope sender is empty */
2568 if (sender_address[0] == 0)
2570 uschar *fromstart, *fromend;
2572 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2573 oname, (oname[0] == 0)? "" : " <");
2574 fromend = (oname[0] == 0)? US"" : US">";
2576 if (sender_local || local_error_message)
2578 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2579 local_part_quote(originator_login), qualify_domain_sender,
2582 else if (submission_mode && authenticated_id != NULL)
2584 if (submission_domain == NULL)
2586 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2587 local_part_quote(authenticated_id), qualify_domain_sender,
2590 else if (submission_domain[0] == 0) /* empty => whole address set */
2592 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2597 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2598 local_part_quote(authenticated_id), submission_domain,
2601 from_header = header_last; /* To get it checked for Sender: */
2605 /* There is a non-null envelope sender. Build the header using the original
2606 sender address, before any rewriting that might have been done while
2611 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2613 (oname[0] == 0)? "" : " <",
2614 (sender_address_unrewritten == NULL)?
2615 sender_address : sender_address_unrewritten,
2616 (oname[0] == 0)? "" : ">");
2618 from_header = header_last; /* To get it checked for Sender: */
2623 /* If the sender is local (without suppress_local_fixups), or if we are in
2624 submission mode and there is an authenticated_id, check that an existing From:
2625 is correct, and if not, generate a Sender: header, unless disabled. Any
2626 previously-existing Sender: header was removed above. Note that sender_local,
2627 as well as being TRUE if the caller of exim is not trusted, is also true if a
2628 trusted caller did not supply a -f argument for non-smtp input. To allow
2629 trusted callers to forge From: without supplying -f, we have to test explicitly
2630 here. If the From: header contains more than one address, then the call to
2631 parse_extract_address fails, and a Sender: header is inserted, as required. */
2633 if (from_header != NULL &&
2634 (active_local_from_check &&
2635 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2636 (submission_mode && authenticated_id != NULL))
2639 BOOL make_sender = TRUE;
2640 int start, end, domain;
2642 uschar *from_address =
2643 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2644 &start, &end, &domain, FALSE);
2645 uschar *generated_sender_address;
2647 if (submission_mode)
2649 if (submission_domain == NULL)
2651 generated_sender_address = string_sprintf("%s@%s",
2652 local_part_quote(authenticated_id), qualify_domain_sender);
2654 else if (submission_domain[0] == 0) /* empty => full address */
2656 generated_sender_address = string_sprintf("%s",
2661 generated_sender_address = string_sprintf("%s@%s",
2662 local_part_quote(authenticated_id), submission_domain);
2666 generated_sender_address = string_sprintf("%s@%s",
2667 local_part_quote(originator_login), qualify_domain_sender);
2669 /* Remove permitted prefixes and suffixes from the local part of the From:
2670 address before doing the comparison with the generated sender. */
2672 if (from_address != NULL)
2675 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2677 if (at != NULL) *at = 0;
2678 from_address += route_check_prefix(from_address, local_from_prefix);
2679 slen = route_check_suffix(from_address, local_from_suffix);
2682 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2683 from_address += slen;
2685 if (at != NULL) *at = '@';
2687 if (strcmpic(generated_sender_address, from_address) == 0 ||
2688 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2689 make_sender = FALSE;
2692 /* We have to cause the Sender header to be rewritten if there are
2693 appropriate rewriting rules. */
2697 if (submission_mode && submission_name == NULL)
2698 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2699 generated_sender_address);
2701 header_add(htype_sender, "%sSender: %s <%s>\n",
2703 submission_mode? submission_name : originator_name,
2704 generated_sender_address);
2707 /* Ensure that a non-null envelope sender address corresponds to the
2708 submission mode sender address. */
2710 if (submission_mode && sender_address[0] != 0)
2712 if (sender_address_unrewritten == NULL)
2713 sender_address_unrewritten = sender_address;
2714 sender_address = generated_sender_address;
2715 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2716 log_write(L_address_rewrite, LOG_MAIN,
2717 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2718 sender_address_unrewritten, generated_sender_address);
2722 /* If there are any rewriting rules, apply them to the sender address, unless
2723 it has already been rewritten as part of verification for SMTP input. */
2725 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2726 sender_address[0] != 0)
2728 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2729 global_rewrite_rules, rewrite_existflags);
2730 DEBUG(D_receive|D_rewrite)
2731 debug_printf("rewritten sender = %s\n", sender_address);
2735 /* The headers must be run through rewrite_header(), because it ensures that
2736 addresses are fully qualified, as well as applying any rewriting rules that may
2739 Qualification of header addresses in a message from a remote host happens only
2740 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2741 appropriate. For local messages, qualification always happens, unless -bnq is
2742 used to explicitly suppress it. No rewriting is done for an unqualified address
2743 that is left untouched.
2745 We start at the second header, skipping our own Received:. This rewriting is
2746 documented as happening *after* recipient addresses are taken from the headers
2747 by the -t command line option. An added Sender: gets rewritten here. */
2749 for (h = header_list->next; h != NULL; h = h->next)
2751 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2752 rewrite_existflags, TRUE);
2753 if (newh != NULL) h = newh;
2757 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2758 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2759 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2760 exists, this applies to the set of resent- headers rather than the normal set.
2762 The requirement for a recipient header has been removed in RFC 2822. At this
2763 point in the code, earlier versions of Exim added a To: header for locally
2764 submitted messages, and an empty Bcc: header for others. In the light of the
2765 changes in RFC 2822, this was dropped in November 2003. */
2768 /* If there is no date header, generate one if the message originates locally
2769 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2770 submission mode flag is set. Messages without Date: are not valid, but it seems
2771 to be more confusing if Exim adds one to all remotely-originated messages.
2772 As per Message-Id, we prepend if resending, else append.
2775 if (!date_header_exists &&
2776 ((sender_host_address == NULL && !suppress_local_fixups)
2777 || submission_mode))
2778 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2779 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2781 search_tidyup(); /* Free any cached resources */
2783 /* Show the complete set of headers if debugging. Note that the first one (the
2784 new Received:) has not yet been set. */
2788 debug_printf(">>Headers after rewriting and local additions:\n");
2789 for (h = header_list->next; h != NULL; h = h->next)
2790 debug_printf("%c %s", h->type, h->text);
2794 /* The headers are now complete in store. If we are running in filter
2795 testing mode, that is all this function does. Return TRUE if the message
2796 ended with a dot. */
2798 if (filter_test != FTEST_NONE)
2800 process_info[process_info_len] = 0;
2801 return message_ended == END_DOT;
2804 /* Cutthrough delivery:
2805 We have to create the Received header now rather than at the end of reception,
2806 so the timestamp behaviour is a change to the normal case.
2807 XXX Ensure this gets documented XXX.
2808 Having created it, send the headers to the destination.
2810 if (cutthrough_fd >= 0)
2812 if (received_count > received_headers_max)
2814 cancel_cutthrough_connection("too many headers");
2815 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2816 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2817 "Too many \"Received\" headers",
2819 (sender_fullhost == NULL)? "" : " H=",
2820 (sender_fullhost == NULL)? US"" : sender_fullhost,
2821 (sender_ident == NULL)? "" : " U=",
2822 (sender_ident == NULL)? US"" : sender_ident);
2823 message_id[0] = 0; /* Indicate no message accepted */
2824 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2825 goto TIDYUP; /* Skip to end of function */
2827 received_header_gen();
2828 add_acl_headers(US"MAIL or RCPT");
2829 (void) cutthrough_headers_send();
2833 /* Open a new spool file for the data portion of the message. We need
2834 to access it both via a file descriptor and a stream. Try to make the
2835 directory if it isn't there. Note re use of sprintf: spool_directory
2836 is checked on input to be < 200 characters long. */
2838 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2840 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2843 if (errno == ENOENT)
2846 sprintf(CS temp, "input/%s", message_subdir);
2847 if (message_subdir[0] == 0) temp[5] = 0;
2848 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2849 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2852 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2853 spool_name, strerror(errno));
2856 /* Make sure the file's group is the Exim gid, and double-check the mode
2857 because the group setting doesn't always get set automatically. */
2859 if (fchown(data_fd, exim_uid, exim_gid))
2860 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2861 "Failed setting ownership on spool file %s: %s",
2862 spool_name, strerror(errno));
2863 (void)fchmod(data_fd, SPOOL_MODE);
2865 /* We now have data file open. Build a stream for it and lock it. We lock only
2866 the first line of the file (containing the message ID) because otherwise there
2867 are problems when Exim is run under Cygwin (I'm told). See comments in
2868 spool_in.c, where the same locking is done. */
2870 data_file = fdopen(data_fd, "w+");
2871 lock_data.l_type = F_WRLCK;
2872 lock_data.l_whence = SEEK_SET;
2873 lock_data.l_start = 0;
2874 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2876 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2877 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2878 errno, strerror(errno));
2880 /* We have an open, locked data file. Write the message id to it to make it
2881 self-identifying. Then read the remainder of the input of this message and
2882 write it to the data file. If the variable next != NULL, it contains the first
2883 data line (which was read as a header but then turned out not to have the right
2884 format); write it (remembering that it might contain binary zeros). The result
2885 of fwrite() isn't inspected; instead we call ferror() below. */
2887 fprintf(data_file, "%s-D\n", message_id);
2890 uschar *s = next->text;
2891 int len = next->slen;
2892 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2893 body_linecount++; /* Assumes only 1 line */
2896 /* Note that we might already be at end of file, or the logical end of file
2897 (indicated by '.'), or might have encountered an error while writing the
2898 message id or "next" line. */
2900 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2904 message_ended = read_message_data_smtp(data_file);
2905 receive_linecount++; /* The terminating "." line */
2907 else message_ended = read_message_data(data_file);
2909 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2910 message_linecount += body_linecount;
2912 /* Handle premature termination of SMTP */
2914 if (smtp_input && message_ended == END_EOF)
2916 Uunlink(spool_name); /* Lose data file when closed */
2917 cancel_cutthrough_connection("sender closed connection");
2918 message_id[0] = 0; /* Indicate no message accepted */
2919 smtp_reply = handle_lost_connection(US"");
2921 goto TIDYUP; /* Skip to end of function */
2924 /* Handle message that is too big. Don't use host_or_ident() in the log
2925 message; we want to see the ident value even for non-remote messages. */
2927 if (message_ended == END_SIZE)
2929 Uunlink(spool_name); /* Lose the data file when closed */
2930 cancel_cutthrough_connection("mail too big");
2931 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2933 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2934 "message too big: read=%d max=%d",
2936 (sender_fullhost == NULL)? "" : " H=",
2937 (sender_fullhost == NULL)? US"" : sender_fullhost,
2938 (sender_ident == NULL)? "" : " U=",
2939 (sender_ident == NULL)? US"" : sender_ident,
2941 thismessage_size_limit);
2945 smtp_reply = US"552 Message size exceeds maximum permitted";
2946 message_id[0] = 0; /* Indicate no message accepted */
2947 goto TIDYUP; /* Skip to end of function */
2951 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2952 give_local_error(ERRMESS_TOOBIG,
2953 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2954 US"message rejected: ", error_rc, data_file, header_list);
2955 /* Does not return */
2960 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2961 example, there may be some expansion in an ACL that uses a timer.) */
2963 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2965 /* The message body has now been read into the data file. Call fflush() to
2966 empty the buffers in C, and then call fsync() to get the data written out onto
2967 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2968 having to do this). If there was an I/O error on either input or output,
2969 attempt to send an error message, and unlink the spool file. For non-SMTP input
2970 we can then give up. Note that for SMTP input we must swallow the remainder of
2971 the input in cases of output errors, since the far end doesn't expect to see
2972 anything until the terminating dot line is sent. */
2974 if (fflush(data_file) == EOF || ferror(data_file) ||
2975 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2977 uschar *msg_errno = US strerror(errno);
2978 BOOL input_error = (receive_ferror)() != 0;
2979 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2980 input_error? "Input read" : "Spool write",
2982 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2984 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2985 Uunlink(spool_name); /* Lose the data file */
2986 cancel_cutthrough_connection("error writing spoolfile");
2991 smtp_reply = US"451 Error while reading input data";
2994 smtp_reply = US"451 Error while writing spool file";
2995 receive_swallow_smtp();
2997 message_id[0] = 0; /* Indicate no message accepted */
2998 goto TIDYUP; /* Skip to end of function */
3003 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3004 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3006 /* Does not return */
3011 /* No I/O errors were encountered while writing the data file. */
3013 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3016 /* If there were any bad addresses extracted by -t, or there were no recipients
3017 left after -t, send a message to the sender of this message, or write it to
3018 stderr if the error handling option is set that way. Note that there may
3019 legitimately be no recipients for an SMTP message if they have all been removed
3022 We need to rewind the data file in order to read it. In the case of no
3023 recipients or stderr error writing, throw the data file away afterwards, and
3024 exit. (This can't be SMTP, which always ensures there's at least one
3025 syntactically good recipient address.) */
3027 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3031 if (recipients_count == 0) debug_printf("*** No recipients\n");
3032 if (bad_addresses != NULL)
3034 error_block *eblock = bad_addresses;
3035 debug_printf("*** Bad address(es)\n");
3036 while (eblock != NULL)
3038 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3039 eblock = eblock->next;
3044 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3046 /* If configured to send errors to the sender, but this fails, force
3047 a failure error code. We use a special one for no recipients so that it
3048 can be detected by the autoreply transport. Otherwise error_rc is set to
3049 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3050 it is EXIT_SUCCESS. */
3052 if (error_handling == ERRORS_SENDER)
3054 if (!moan_to_sender(
3055 (bad_addresses == NULL)?
3056 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3057 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3058 bad_addresses, header_list, data_file, FALSE))
3059 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3063 if (bad_addresses == NULL)
3065 if (extracted_ignored)
3066 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3068 fprintf(stderr, "exim: no recipients in message\n");
3072 fprintf(stderr, "exim: invalid address%s",
3073 (bad_addresses->next == NULL)? ":" : "es:\n");
3074 while (bad_addresses != NULL)
3076 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3077 bad_addresses->text2);
3078 bad_addresses = bad_addresses->next;
3083 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3085 Uunlink(spool_name);
3086 (void)fclose(data_file);
3087 exim_exit(error_rc);
3091 /* Data file successfully written. Generate text for the Received: header by
3092 expanding the configured string, and adding a timestamp. By leaving this
3093 operation till now, we ensure that the timestamp is the time that message
3094 reception was completed. However, this is deliberately done before calling the
3095 data ACL and local_scan().
3097 This Received: header may therefore be inspected by the data ACL and by code in
3098 the local_scan() function. When they have run, we update the timestamp to be
3099 the final time of reception.
3101 If there is just one recipient, set up its value in the $received_for variable
3102 for use when we generate the Received: header.
3104 Note: the checking for too many Received: headers is handled by the delivery
3106 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3108 if (received_header->text == NULL) /* Non-cutthrough case */
3110 received_header_gen();
3112 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3114 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3115 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3117 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3118 now, before running the DATA ACL. */
3120 add_acl_headers(US"MAIL or RCPT");
3123 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3124 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3126 /* If an ACL is specified for checking things at this stage of reception of a
3127 message, run it, unless all the recipients were removed by "discard" in earlier
3128 ACLs. That is the only case in which recipients_count can be zero at this
3129 stage. Set deliver_datafile to point to the data file so that $message_body and
3130 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3133 deliver_datafile = data_fd;
3136 enable_dollar_recipients = TRUE;
3138 if (recipients_count == 0)
3140 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3144 /* Handle interactive SMTP messages */
3146 if (smtp_input && !smtp_batched_input)
3149 #ifndef DISABLE_DKIM
3150 if (!dkim_disable_verify)
3152 /* Finish verification, this will log individual signature results to
3154 dkim_exim_verify_finish();
3156 /* Check if we must run the DKIM ACL */
3157 if ((acl_smtp_dkim != NULL) &&
3158 (dkim_verify_signers != NULL) &&
3159 (dkim_verify_signers[0] != '\0'))
3161 uschar *dkim_verify_signers_expanded =
3162 expand_string(dkim_verify_signers);
3163 if (dkim_verify_signers_expanded == NULL)
3165 log_write(0, LOG_MAIN|LOG_PANIC,
3166 "expansion of dkim_verify_signers option failed: %s",
3167 expand_string_message);
3172 uschar *ptr = dkim_verify_signers_expanded;
3173 uschar *item = NULL;
3174 uschar *seen_items = NULL;
3175 int seen_items_size = 0;
3176 int seen_items_offset = 0;
3177 uschar itembuf[256];
3178 /* Default to OK when no items are present */
3180 while ((item = string_nextinlist(&ptr, &sep,
3182 sizeof(itembuf))) != NULL)
3184 /* Prevent running ACL for an empty item */
3185 if (!item || (item[0] == '\0')) continue;
3186 /* Only run ACL once for each domain or identity, no matter how often it
3187 appears in the expanded list. */
3188 if (seen_items != NULL)
3190 uschar *seen_item = NULL;
3191 uschar seen_item_buf[256];
3192 uschar *seen_items_list = seen_items;
3193 int seen_this_item = 0;
3195 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3197 sizeof(seen_item_buf))) != NULL)
3199 if (Ustrcmp(seen_item,item) == 0)
3206 if (seen_this_item > 0)
3209 debug_printf("acl_smtp_dkim: skipping signer %s, already seen\n", item);
3213 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,":");
3216 seen_items = string_append(seen_items,&seen_items_size,&seen_items_offset,1,item);
3217 seen_items[seen_items_offset] = '\0';
3220 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n", item);
3222 dkim_exim_acl_setup(item);
3223 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim, &user_msg, &log_msg);
3228 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, skipping remaining items\n", rc, item);
3229 cancel_cutthrough_connection("dkim acl not ok");
3233 add_acl_headers(US"DKIM");
3236 recipients_count = 0;
3237 blackholed_by = US"DKIM ACL";
3238 if (log_msg != NULL)
3239 blackhole_log_msg = string_sprintf(": %s", log_msg);
3243 Uunlink(spool_name);
3244 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3245 smtp_yield = FALSE; /* No more messsages after dropped connection */
3246 smtp_reply = US""; /* Indicate reply already sent */
3247 message_id[0] = 0; /* Indicate no message accepted */
3248 goto TIDYUP; /* Skip to end of function */
3253 #endif /* DISABLE_DKIM */
3255 #ifdef WITH_CONTENT_SCAN
3256 if (recipients_count > 0 &&
3257 acl_smtp_mime != NULL &&
3258 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3260 #endif /* WITH_CONTENT_SCAN */
3262 #ifdef EXPERIMENTAL_DMARC
3263 dmarc_up = dmarc_store_data(from_header);
3264 #endif /* EXPERIMENTAL_DMARC */
3266 #ifdef EXPERIMENTAL_PRDR
3267 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr != NULL )
3271 int all_fail = FAIL;
3273 smtp_printf("353 PRDR content analysis beginning\r\n");
3274 /* Loop through recipients, responses must be in same order received */
3275 for (c = 0; recipients_count > c; c++)
3277 uschar * addr= recipients_list[c].address;
3278 uschar * msg= US"PRDR R=<%s> %s";
3281 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3282 addr, c+1, recipients_count);
3283 rc = acl_check(ACL_WHERE_PRDR, addr,
3284 acl_smtp_data_prdr, &user_msg, &log_msg);
3286 /* If any recipient rejected content, indicate it in final message */
3288 /* If all recipients rejected, indicate in final message */
3293 case OK: case DISCARD: code = US"250"; break;
3294 case DEFER: code = US"450"; break;
3295 default: code = US"550"; break;
3297 if (user_msg != NULL)
3298 smtp_user_msg(code, user_msg);
3303 case OK: case DISCARD:
3304 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3306 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3308 msg = string_sprintf(CS msg, addr, "refusal"); break;
3310 smtp_user_msg(code, msg);
3312 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3313 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3314 else log_write(0, LOG_MAIN, CS msg);
3316 if (rc != OK) { receive_remove_recipient(addr); c--; }
3318 /* Set up final message, used if data acl gives OK */
3319 smtp_reply = string_sprintf("%s id=%s message %s",
3320 all_fail == FAIL ? US"550" : US"250",
3323 ? US"rejected for all recipients"
3326 : US"accepted for some recipients");
3327 if (recipients_count == 0)
3329 message_id[0] = 0; /* Indicate no message accepted */
3334 prdr_requested = FALSE;
3335 #endif /* EXPERIMENTAL_PRDR */
3337 /* Check the recipients count again, as the MIME ACL might have changed
3340 if (acl_smtp_data != NULL && recipients_count > 0)
3342 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3343 add_acl_headers(US"DATA");
3346 recipients_count = 0;
3347 blackholed_by = US"DATA ACL";
3348 if (log_msg != NULL)
3349 blackhole_log_msg = string_sprintf(": %s", log_msg);
3350 cancel_cutthrough_connection("data acl discard");
3354 Uunlink(spool_name);
3355 cancel_cutthrough_connection("data acl not ok");
3356 #ifdef WITH_CONTENT_SCAN
3359 #ifdef EXPERIMENTAL_DCC
3362 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3363 smtp_yield = FALSE; /* No more messsages after dropped connection */
3364 smtp_reply = US""; /* Indicate reply already sent */
3365 message_id[0] = 0; /* Indicate no message accepted */
3366 goto TIDYUP; /* Skip to end of function */
3371 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3372 we cannot take different actions for permanent and temporary rejections. */
3377 #ifdef WITH_CONTENT_SCAN
3378 if (acl_not_smtp_mime != NULL &&
3379 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3382 #endif /* WITH_CONTENT_SCAN */
3384 if (acl_not_smtp != NULL)
3386 uschar *user_msg, *log_msg;
3387 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3390 recipients_count = 0;
3391 blackholed_by = US"non-SMTP ACL";
3392 if (log_msg != NULL)
3393 blackhole_log_msg = string_sprintf(": %s", log_msg);
3397 Uunlink(spool_name);
3398 #ifdef WITH_CONTENT_SCAN
3401 #ifdef EXPERIMENTAL_DCC
3404 /* The ACL can specify where rejections are to be logged, possibly
3405 nowhere. The default is main and reject logs. */
3407 if (log_reject_target != 0)
3408 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3409 sender_address, log_msg);
3411 if (user_msg == NULL) user_msg = US"local configuration problem";
3412 if (smtp_batched_input)
3414 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3415 /* Does not return */
3419 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3420 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3421 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3423 /* Does not return */
3426 add_acl_headers(US"non-SMTP");
3430 /* The applicable ACLs have been run */
3432 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3433 if (queue_only_policy) queued_by = US"ACL";
3436 #ifdef WITH_CONTENT_SCAN
3440 #ifdef EXPERIMENTAL_DCC
3445 /* The final check on the message is to run the scan_local() function. The
3446 version supplied with Exim always accepts, but this is a hook for sysadmins to
3447 supply their own checking code. The local_scan() function is run even when all
3448 the recipients have been discarded. */
3450 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3452 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3453 deleted, and the incident gets logged. */
3455 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3456 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3457 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3458 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3460 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3461 local_scan_timeout);
3462 local_scan_data = NULL;
3464 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3465 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3466 rc = local_scan(data_fd, &local_scan_data);
3468 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3470 enable_dollar_recipients = FALSE;
3472 store_pool = POOL_MAIN; /* In case changed */
3473 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3476 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3477 os_non_restarting_signal(SIGFPE, SIG_DFL);
3478 os_non_restarting_signal(SIGILL, SIG_DFL);
3479 os_non_restarting_signal(SIGBUS, SIG_DFL);
3481 /* The length check is paranoia against some runaway code, and also because
3482 (for a success return) lines in the spool file are read into big_buffer. */
3484 if (local_scan_data != NULL)
3486 int len = Ustrlen(local_scan_data);
3487 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3488 local_scan_data = string_copyn(local_scan_data, len);
3491 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3493 if (!deliver_freeze) /* ACL might have already frozen */
3495 deliver_freeze = TRUE;
3496 deliver_frozen_at = time(NULL);
3497 frozen_by = US"local_scan()";
3499 rc = LOCAL_SCAN_ACCEPT;
3501 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3503 if (!queue_only_policy) /* ACL might have already queued */
3505 queue_only_policy = TRUE;
3506 queued_by = US"local_scan()";
3508 rc = LOCAL_SCAN_ACCEPT;
3511 /* Message accepted: remove newlines in local_scan_data because otherwise
3512 the spool file gets corrupted. Ensure that all recipients are qualified. */
3514 if (rc == LOCAL_SCAN_ACCEPT)
3516 if (local_scan_data != NULL)
3519 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3521 for (i = 0; i < recipients_count; i++)
3523 recipient_item *r = recipients_list + i;
3524 r->address = rewrite_address_qualify(r->address, TRUE);
3525 if (r->errors_to != NULL)
3526 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3528 if (recipients_count == 0 && blackholed_by == NULL)
3529 blackholed_by = US"local_scan";
3532 /* Message rejected: newlines permitted in local_scan_data to generate
3533 multiline SMTP responses. */
3537 uschar *istemp = US"";
3543 errmsg = local_scan_data;
3545 Uunlink(spool_name); /* Cancel this message */
3549 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3550 "rejection given", rc);
3553 case LOCAL_SCAN_REJECT_NOLOGHDR:
3554 log_extra_selector &= ~LX_rejected_header;
3557 case LOCAL_SCAN_REJECT:
3558 smtp_code = US"550";
3559 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3562 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3563 log_extra_selector &= ~LX_rejected_header;
3566 case LOCAL_SCAN_TEMPREJECT:
3568 smtp_code = US"451";
3569 if (errmsg == NULL) errmsg = US"Temporary local problem";
3570 istemp = US"temporarily ";
3574 s = string_append(s, &size, &sptr, 2, US"F=",
3575 (sender_address[0] == 0)? US"<>" : sender_address);
3576 s = add_host_info_for_log(s, &size, &sptr);
3579 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3580 s, istemp, string_printing(errmsg));
3584 if (!smtp_batched_input)
3586 smtp_respond(smtp_code, 3, TRUE, errmsg);
3587 message_id[0] = 0; /* Indicate no message accepted */
3588 smtp_reply = US""; /* Indicate reply already sent */
3589 goto TIDYUP; /* Skip to end of function */
3593 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3594 /* Does not return */
3599 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3600 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3601 US"message rejected by local scan code: ", error_rc, data_file,
3603 /* Does not return */
3607 /* Reset signal handlers to ignore signals that previously would have caused
3608 the message to be abandoned. */
3610 signal(SIGTERM, SIG_IGN);
3611 signal(SIGINT, SIG_IGN);
3614 /* Ensure the first time flag is set in the newly-received message. */
3616 deliver_firsttime = TRUE;
3618 #ifdef EXPERIMENTAL_BRIGHTMAIL
3620 /* rewind data file */
3621 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3622 bmi_verdicts = bmi_process_message(header_list, data_fd);
3626 /* Update the timstamp in our Received: header to account for any time taken by
3627 an ACL or by local_scan(). The new time is the time that all reception
3628 processing is complete. */
3630 timestamp = expand_string(US"${tod_full}");
3631 tslen = Ustrlen(timestamp);
3633 memcpy(received_header->text + received_header->slen - tslen - 1,
3636 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3640 deliver_freeze = FALSE;
3641 queue_only_policy = FALSE;
3644 /* Keep the data file open until we have written the header file, in order to
3645 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3646 don't write the header file, and we unlink the data file. If writing the header
3647 file fails, we have failed to accept this message. */
3649 if (host_checking || blackholed_by != NULL)
3652 Uunlink(spool_name);
3653 msg_size = 0; /* Compute size for log line */
3654 for (h = header_list; h != NULL; h = h->next)
3655 if (h->type != '*') msg_size += h->slen;
3658 /* Write the -H file */
3662 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3664 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3665 Uunlink(spool_name); /* Lose the data file */
3669 smtp_reply = US"451 Error in writing spool file";
3670 message_id[0] = 0; /* Indicate no message accepted */
3675 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3676 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3678 /* Does not return */
3684 /* The message has now been successfully received. */
3686 receive_messagecount++;
3688 /* In SMTP sessions we may receive several in one connection. After each one,
3689 we wait for the clock to tick at the level of message-id granularity. This is
3690 so that the combination of time+pid is unique, even on systems where the pid
3691 can be re-used within our time interval. We can't shorten the interval without
3692 re-designing the message-id. See comments above where the message id is
3693 created. This is Something For The Future. */
3695 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3696 exim_wait_tick(&message_id_tv, id_resolution);
3698 /* Add data size to written header size. We do not count the initial file name
3699 that is in the file, but we do add one extra for the notional blank line that
3700 precedes the data. This total differs from message_size in that it include the
3701 added Received: header and any other headers that got created locally. */
3704 fstat(data_fd, &statbuf);
3706 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3708 /* Generate a "message received" log entry. We do this by building up a dynamic
3709 string as required. Since we commonly want to add two items at a time, use a
3710 macro to simplify the coding. We log the arrival of a new message while the
3711 file is still locked, just in case the machine is *really* fast, and delivers
3712 it first! Include any message id that is in the message - since the syntax of a
3713 message id is actually an addr-spec, we can use the parse routine to canonicize
3718 s = store_get(size);
3720 s = string_append(s, &size, &sptr, 2, US"<= ",
3721 (sender_address[0] == 0)? US"<>" : sender_address);
3722 if (message_reference != NULL)
3723 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3725 s = add_host_info_for_log(s, &size, &sptr);
3728 if ((log_extra_selector & LX_tls_cipher) != 0 && tls_in.cipher != NULL)
3729 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3730 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3731 tls_in.cipher != NULL)
3732 s = string_append(s, &size, &sptr, 2, US" CV=",
3733 tls_in.certificate_verified? "yes":"no");
3734 if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_in.peerdn != NULL)
3735 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3736 string_printing(tls_in.peerdn), US"\"");
3737 if ((log_extra_selector & LX_tls_sni) != 0 && tls_in.sni != NULL)
3738 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3739 string_printing(tls_in.sni), US"\"");
3742 if (sender_host_authenticated != NULL)
3744 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3745 if (authenticated_id != NULL)
3747 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3748 if (log_extra_selector & LX_smtp_mailauth && authenticated_sender != NULL)
3749 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3753 #ifdef EXPERIMENTAL_PRDR
3755 s = string_append(s, &size, &sptr, 1, US" PRDR");
3758 sprintf(CS big_buffer, "%d", msg_size);
3759 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3761 /* log 8BITMIME mode announced in MAIL_FROM
3765 if (log_extra_selector & LX_8bitmime)
3767 sprintf(CS big_buffer, "%d", body_8bitmime);
3768 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3771 /* If an addr-spec in a message-id contains a quoted string, it can contain
3772 any characters except " \ and CR and so in particular it can contain NL!
3773 Therefore, make sure we use a printing-characters only version for the log.
3774 Also, allow for domain literals in the message id. */
3776 if (msgid_header != NULL)
3779 BOOL save_allow_domain_literals = allow_domain_literals;
3780 allow_domain_literals = TRUE;
3781 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3782 &errmsg, &start, &end, &domain, FALSE);
3783 allow_domain_literals = save_allow_domain_literals;
3785 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3788 /* If subject logging is turned on, create suitable printing-character
3789 text. By expanding $h_subject: we make use of the MIME decoding. */
3791 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3794 uschar *p = big_buffer;
3795 uschar *ss = expand_string(US"$h_subject:");
3797 /* Backslash-quote any double quotes or backslashes so as to make a
3798 a C-like string, and turn any non-printers into escape sequences. */
3801 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3803 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3808 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3811 /* Terminate the string: string_cat() and string_append() leave room, but do
3812 not put the zero in. */
3816 /* Create a message log file if message logs are being used and this message is
3817 not blackholed. Write the reception stuff to it. We used to leave message log
3818 creation until the first delivery, but this has proved confusing for some
3821 if (message_logs && blackholed_by == NULL)
3825 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3827 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3829 if (fd < 0 && errno == ENOENT)
3832 sprintf(CS temp, "msglog/%s", message_subdir);
3833 if (message_subdir[0] == 0) temp[6] = 0;
3834 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3835 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3840 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3841 spool_name, strerror(errno));
3846 FILE *message_log = fdopen(fd, "a");
3847 if (message_log == NULL)
3849 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3850 spool_name, strerror(errno));
3855 uschar *now = tod_stamp(tod_log);
3856 fprintf(message_log, "%s Received from %s\n", now, s+3);
3857 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3859 if (queue_only_policy) fprintf(message_log,
3860 "%s no immediate delivery: queued by %s\n", now, queued_by);
3861 (void)fclose(message_log);
3866 /* Everything has now been done for a successful message except logging its
3867 arrival, and outputting an SMTP response. While writing to the log, set a flag
3868 to cause a call to receive_bomb_out() if the log cannot be opened. */
3870 receive_call_bombout = TRUE;
3872 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3873 connection has gone away. This can only be done if there is no unconsumed input
3874 waiting in the local input buffer. We can test for this by calling
3875 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3876 input to be sent following the final dot, so the presence of following input is
3879 If the connection is still present, but there is no unread input for the
3880 socket, the result of a select() call will be zero. If, however, the connection
3881 has gone away, or if there is pending input, the result of select() will be
3882 non-zero. The two cases can be distinguished by trying to read the next input
3883 character. If we succeed, we can unread it so that it remains in the local
3884 buffer for handling later. If not, the connection has been lost.
3886 Of course, since TCP/IP is asynchronous, there is always a chance that the
3887 connection will vanish between the time of this test and the sending of the
3888 response, but the chance of this happening should be small. */
3890 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3891 !receive_smtp_buffered())
3894 fd_set select_check;
3895 FD_ZERO(&select_check);
3896 FD_SET(fileno(smtp_in), &select_check);
3900 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3902 int c = (receive_getc)();
3903 if (c != EOF) (receive_ungetc)(c); else
3905 uschar *msg = US"SMTP connection lost after final dot";
3906 smtp_reply = US""; /* No attempt to send a response */
3907 smtp_yield = FALSE; /* Nothing more on this connection */
3909 /* Re-use the log line workspace */
3912 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3913 s = add_host_info_for_log(s, &size, &sptr);
3915 log_write(0, LOG_MAIN, "%s", s);
3917 /* Delete the files for this aborted message. */
3919 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3920 message_subdir, message_id);
3921 Uunlink(spool_name);
3923 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3924 message_subdir, message_id);
3925 Uunlink(spool_name);
3927 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3928 message_subdir, message_id);
3929 Uunlink(spool_name);
3936 /* The connection has not gone away; we really are going to take responsibility
3937 for this message. */
3939 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
3942 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
3943 the sender's dot (below).
3944 If rejected: copy response to sender, wipe the spooled files, log approriately.
3945 If temp-reject: accept to sender, keep the spooled files.
3947 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3949 XXX We do not handle queue-only, freezing, or blackholes.
3951 cutthrough_done = 0;
3952 if(cutthrough_fd >= 0)
3954 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the messsage */
3955 /* Logging was done in finaldot() */
3958 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3959 cutthrough_done = 3;
3960 break; /* message_id needed for SMTP accept below */
3962 default: /* Unknown response, or error. Treat as temp-reject. */
3963 case '4': /* Temp-reject. Keep spoolfiles and accept. */
3964 cutthrough_done = 1; /* Avoid the usual immediate delivery attempt */
3965 break; /* message_id needed for SMTP accept below */
3967 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
3968 smtp_reply= msg; /* Pass on the exact error */
3969 cutthrough_done = 2;
3974 if(smtp_reply == NULL
3975 #ifdef EXPERIMENTAL_PRDR
3980 log_write(0, LOG_MAIN |
3981 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3982 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3985 /* Log any control actions taken by an ACL or local_scan(). */
3987 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3988 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3989 "no immediate delivery: queued by %s", queued_by);
3991 receive_call_bombout = FALSE;
3993 store_reset(s); /* The store for the main log message can be reused */
3995 /* If the message is frozen, and freeze_tell is set, do the telling. */
3997 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3999 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4000 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4001 message_id, frozen_by, sender_address);
4005 /* Either a message has been successfully received and written to the two spool
4006 files, or an error in writing the spool has occurred for an SMTP message, or
4007 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4008 we will have already given up because there's no point in carrying on!) In
4009 either event, we must now close (and thereby unlock) the data file. In the
4010 successful case, this leaves the message on the spool, ready for delivery. In
4011 the error case, the spool file will be deleted. Then tidy up store, interact
4012 with an SMTP call if necessary, and return.
4014 A fflush() was done earlier in the expectation that any write errors on the
4015 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4016 possible for fclose() to fail - but what to do? What has happened to the lock
4021 process_info[process_info_len] = 0; /* Remove message id */
4022 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4024 /* Now reset signal handlers to their defaults */
4026 signal(SIGTERM, SIG_DFL);
4027 signal(SIGINT, SIG_DFL);
4029 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4030 value, which defaults TRUE - meaning there may be more incoming messages from
4031 this connection. For non-SMTP callers (where there is only ever one message),
4032 the default is FALSE. */
4038 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4039 is set to the response that should be sent. When it is NULL, we generate
4040 default responses. After an ACL error or local_scan() error, the response has
4041 already been sent, and smtp_reply is an empty string to indicate this. */
4043 if (!smtp_batched_input)
4045 if (smtp_reply == NULL)
4047 if (fake_response != OK)
4048 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4049 fake_response_text);
4051 /* An OK response is required; use "message" text if present. */
4053 else if (user_msg != NULL)
4055 uschar *code = US"250";
4057 smtp_message_code(&code, &len, &user_msg, NULL);
4058 smtp_respond(code, len, TRUE, user_msg);
4061 /* Default OK response */
4064 smtp_printf("250 OK id=%s\r\n", message_id);
4067 "\n**** SMTP testing: that is not a real message id!\n\n");
4070 /* smtp_reply is set non-empty */
4072 else if (smtp_reply[0] != 0)
4074 if (fake_response != OK && (smtp_reply[0] == '2'))
4075 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4076 fake_response_text);
4078 smtp_printf("%.1024s\r\n", smtp_reply);
4081 switch (cutthrough_done)
4083 case 3: log_write(0, LOG_MAIN, "Completed"); /* Delivery was done */
4084 case 2: { /* Delete spool files */
4085 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
4086 message_subdir, message_id);
4087 Uunlink(spool_name);
4088 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
4089 message_subdir, message_id);
4090 Uunlink(spool_name);
4091 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
4092 message_subdir, message_id);
4093 Uunlink(spool_name);
4095 case 1: message_id[0] = 0; /* Prevent a delivery from starting */
4098 cutthrough_delivery = FALSE;
4101 /* For batched SMTP, generate an error message on failure, and do
4102 nothing on success. The function moan_smtp_batch() does not return -
4103 it exits from the program with a non-zero return code. */
4105 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
4109 /* If blackholing, we can immediately log this message's sad fate. The data
4110 file has already been unlinked, and the header file was never written to disk.
4111 We must now indicate that nothing was received, to prevent a delivery from
4114 if (blackholed_by != NULL)
4116 uschar *detail = (local_scan_data != NULL)?
4117 string_printing(local_scan_data) :
4118 string_sprintf("(%s discarded recipients)", blackholed_by);
4119 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4120 log_write(0, LOG_MAIN, "Completed");
4124 /* Reset headers so that logging of rejects for a subsequent message doesn't
4125 include them. It is also important to set header_last = NULL before exiting
4126 from this function, as this prevents certain rewrites that might happen during
4127 subsequent verifying (of another incoming message) from trying to add headers
4128 when they shouldn't. */
4130 header_list = header_last = NULL;
4132 return yield; /* TRUE if more messages (SMTP only) */
4135 /* End of receive.c */