1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
12 #ifdef EXPERIMENTAL_DCC
16 #ifdef EXPERIMENTAL_DMARC
18 #endif /* EXPERIMENTAL_DMARC */
20 /*************************************************
21 * Local static variables *
22 *************************************************/
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar spool_name[256];
30 /*************************************************
31 * Non-SMTP character reading functions *
32 *************************************************/
34 /* These are the default functions that are set up in the variables such as
35 receive_getc initially. They just call the standard functions, passing stdin as
36 the file. (When SMTP input is occurring, different functions are used by
37 changing the pointer variables.) */
48 return ungetc(c, stdin);
66 /*************************************************
67 * Check that a set sender is allowed *
68 *************************************************/
70 /* This function is called when a local caller sets an explicit sender address.
71 It checks whether this is permitted, which it is for trusted callers.
72 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74 Arguments: the proposed sender address
75 Returns: TRUE for a trusted caller
76 TRUE if the address has been set, untrusted_set_sender has been
77 set, and the address matches something in the list
82 receive_check_set_sender(uschar *newsender)
85 if (trusted_caller) return TRUE;
86 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
87 qnewsender = (Ustrchr(newsender, '@') != NULL)?
88 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 match_address_list(qnewsender, TRUE, TRUE, CUSS &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 const 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))))
153 if (Ustrcmp(path, "syslog") != 0)
156 if (path == NULL) /* No log files */
162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
164 subdirectory has been symbolically linked elsewhere. */
168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
178 /* We now have the path; do the business */
180 memset(&statbuf, 0, sizeof(statbuf));
182 if (STATVFS(CS path, &statbuf) != 0)
184 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
185 "%s directory %s: %s", name, spool_directory, strerror(errno));
186 smtp_closedown(US"spool or log directory problem");
187 exim_exit(EXIT_FAILURE);
190 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
192 /* Disks are getting huge. Take care with computing the size in kilobytes. */
194 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
196 /* Unable to find partition sizes in this environment. */
207 /*************************************************
208 * Check space on spool and log partitions *
209 *************************************************/
211 /* This function is called before accepting a message; if any thresholds are
212 set, it checks them. If a message_size is supplied, it checks that there is
213 enough space for that size plus the threshold - i.e. that the message won't
214 reduce the space to the threshold. Not all OS have statvfs(); for those that
215 don't, this function always returns TRUE. For some OS the old function and
216 struct name statfs is used; that is handled by a macro, defined in exim.h.
219 msg_size the (estimated) size of an incoming message
221 Returns: FALSE if there isn't enough space, or if the information cannot
223 TRUE if no check was done or there is enough space
227 receive_check_fs(int msg_size)
231 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
233 space = receive_statvfs(TRUE, &inodes);
236 debug_printf("spool directory space = %dK inodes = %d "
237 "check_space = %dK inodes = %d msg_size = %d\n",
238 space, inodes, check_spool_space, check_spool_inodes, msg_size);
240 if ((space >= 0 && space < check_spool_space) ||
241 (inodes >= 0 && inodes < check_spool_inodes))
243 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
244 "inodes=%d", space, inodes);
249 if (check_log_space > 0 || check_log_inodes > 0)
251 space = receive_statvfs(FALSE, &inodes);
254 debug_printf("log directory space = %dK inodes = %d "
255 "check_space = %dK inodes = %d\n",
256 space, inodes, check_log_space, check_log_inodes);
258 if ((space >= 0 && space < check_log_space) ||
259 (inodes >= 0 && inodes < check_log_inodes))
261 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
262 "inodes=%d", space, inodes);
272 /*************************************************
273 * Bomb out while reading a message *
274 *************************************************/
276 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
277 received, or if there is a timeout. A rarer case might be if the log files are
278 screwed up and Exim can't open them to record a message's arrival. Handling
279 that case is done by setting a flag to cause the log functions to call this
280 function if there is an ultimate disaster. That is why it is globally
284 reason text reason to pass to the not-quit ACL
285 msg default SMTP response to give if in an SMTP session
290 receive_bomb_out(uschar *reason, uschar *msg)
292 static BOOL already_bombing_out;
293 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
294 timeouts, if someone has something slow in their quit ACL. Since the only
295 things we should be doing are to close down cleanly ASAP, on the second
296 pass we also close down stuff that might be opened again, before bypassing
297 the ACL call and exiting. */
299 /* If spool_name is set, it contains the name of the data file that is being
300 written. Unlink it before closing so that it cannot be picked up by a delivery
301 process. Ensure that any header file is also removed. */
303 if (spool_name[0] != '\0')
306 spool_name[Ustrlen(spool_name) - 1] = 'H';
308 spool_name[0] = '\0';
311 /* Now close the file if it is open, either as a fd or a stream. */
313 if (data_file != NULL)
315 (void)fclose(data_file);
317 } else if (data_fd >= 0) {
318 (void)close(data_fd);
322 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
323 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
326 if (!already_bombing_out)
328 already_bombing_out = TRUE;
331 if (smtp_batched_input)
332 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
333 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
334 smtp_active_hostname, msg);
338 /* Exit from the program (non-BSMTP cases) */
340 exim_exit(EXIT_FAILURE);
344 /*************************************************
345 * Data read timeout *
346 *************************************************/
348 /* Handler function for timeouts that occur while reading the data that
351 Argument: the signal number
356 data_timeout_handler(int sig)
360 sig = sig; /* Keep picky compilers happy */
364 msg = US"SMTP incoming data timeout";
365 log_write(L_lost_incoming_connection,
366 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
368 (sender_fullhost != NULL)? sender_fullhost : US"local process",
373 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
374 log_write(L_lost_incoming_connection,
375 LOG_MAIN, "timed out while reading local message");
378 receive_bomb_out(US"data-timeout", msg); /* Does not return */
383 /*************************************************
384 * local_scan() timeout *
385 *************************************************/
387 /* Handler function for timeouts that occur while running a local_scan()
390 Argument: the signal number
395 local_scan_timeout_handler(int sig)
397 sig = sig; /* Keep picky compilers happy */
398 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
399 "message temporarily rejected (size %d)", message_size);
400 /* Does not return */
401 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
406 /*************************************************
407 * local_scan() crashed *
408 *************************************************/
410 /* Handler function for signals that occur while running a local_scan()
413 Argument: the signal number
418 local_scan_crash_handler(int sig)
420 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
421 "signal %d - message temporarily rejected (size %d)", sig, message_size);
422 /* Does not return */
423 receive_bomb_out(US"local-scan-error", US"local verification problem");
427 /*************************************************
428 * SIGTERM or SIGINT received *
429 *************************************************/
431 /* Handler for SIGTERM or SIGINT signals that occur while reading the
432 data that comprises a message.
434 Argument: the signal number
439 data_sigterm_sigint_handler(int sig)
445 msg = US"Service not available - SIGTERM or SIGINT received";
446 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
447 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
451 if (filter_test == FTEST_NONE)
453 fprintf(stderr, "\nexim: %s received - message abandoned\n",
454 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
455 log_write(0, LOG_MAIN, "%s received while reading local message",
456 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
460 receive_bomb_out(US"signal-exit", msg); /* Does not return */
465 /*************************************************
466 * Add new recipient to list *
467 *************************************************/
469 /* This function builds a list of recipient addresses in argc/argv
473 recipient the next address to add to recipients_list
474 pno parent number for fixed aliases; -1 otherwise
480 receive_add_recipient(uschar *recipient, int pno)
482 if (recipients_count >= recipients_list_max)
484 recipient_item *oldlist = recipients_list;
485 int oldmax = recipients_list_max;
486 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
487 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
489 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
492 recipients_list[recipients_count].address = recipient;
493 recipients_list[recipients_count].pno = pno;
494 #ifdef EXPERIMENTAL_BRIGHTMAIL
495 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
496 /* reset optin string pointer for next recipient */
497 bmi_current_optin = NULL;
499 recipients_list[recipients_count].orcpt = NULL;
500 recipients_list[recipients_count].dsn_flags = 0;
501 recipients_list[recipients_count++].errors_to = NULL;
507 /*************************************************
508 * Send user response message *
509 *************************************************/
511 /* This function is passed a default response code and a user message. It calls
512 smtp_message_code() to check and possibly modify the response code, and then
513 calls smtp_respond() to transmit the response. I put this into a function
514 just to avoid a lot of repetition.
517 code the response code
518 user_msg the user message
525 smtp_user_msg(uschar *code, uschar *user_msg)
528 smtp_message_code(&code, &len, &user_msg, NULL);
529 smtp_respond(code, len, TRUE, user_msg);
537 /*************************************************
538 * Remove a recipient from the list *
539 *************************************************/
541 /* This function is provided for local_scan() to use.
544 recipient address to remove
546 Returns: TRUE if it did remove something; FALSE otherwise
550 receive_remove_recipient(uschar *recipient)
553 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
555 for (count = 0; count < recipients_count; count++)
557 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
559 if ((--recipients_count - count) > 0)
560 memmove(recipients_list + count, recipients_list + count + 1,
561 (recipients_count - count)*sizeof(recipient_item));
572 /*************************************************
573 * Read data portion of a non-SMTP message *
574 *************************************************/
576 /* This function is called to read the remainder of a message (following the
577 header) when the input is not from SMTP - we are receiving a local message on
578 a standard input stream. The message is always terminated by EOF, and is also
579 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
580 two cases for maximum efficiency.
582 Ensure that the body ends with a newline. This will naturally be the case when
583 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
584 as "sequences of lines" - this of course strictly applies only to SMTP, but
585 deliveries into BSD-type mailbox files also require it. Exim used to have a
586 flag for doing this at delivery time, but as it was always set for all
587 transports, I decided to simplify things by putting the check here instead.
589 There is at least one MUA (dtmail) that sends CRLF via this interface, and
590 other programs are known to do this as well. Exim used to have a option for
591 dealing with this: in July 2003, after much discussion, the code has been
592 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
594 However, for the case when a dot on a line by itself terminates a message, the
595 only recognized terminating sequences before and after the dot are LF and CRLF.
596 Otherwise, having read EOL . CR, you don't know whether to read another
599 Internally, in messages stored in Exim's spool files, LF is used as the line
600 terminator. Under the new regime, bare CRs will no longer appear in these
604 fout a FILE to which to write the message
606 Returns: One of the END_xxx values indicating why it stopped reading
610 read_message_data(FILE *fout)
614 register int linelength = 0;
616 /* Handle the case when only EOF terminates the message */
620 register int last_ch = '\n';
622 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
624 if (ch == 0) body_zerocount++;
625 if (last_ch == '\r' && ch != '\n')
627 if (linelength > max_received_linelength)
628 max_received_linelength = linelength;
630 if (fputc('\n', fout) == EOF) return END_WERROR;
634 if (ch == '\r') continue;
636 if (fputc(ch, fout) == EOF) return END_WERROR;
639 if (linelength > max_received_linelength)
640 max_received_linelength = linelength;
645 if (++message_size > thismessage_size_limit) return END_SIZE;
650 if (linelength > max_received_linelength)
651 max_received_linelength = linelength;
652 if (fputc('\n', fout) == EOF) return END_WERROR;
660 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
664 while ((ch = (receive_getc)()) != EOF)
666 if (ch == 0) body_zerocount++;
669 case 0: /* Normal state (previous char written) */
673 if (linelength > max_received_linelength)
674 max_received_linelength = linelength;
679 { ch_state = 2; continue; }
682 case 1: /* After written "\n" */
683 if (ch == '.') { ch_state = 3; continue; }
684 if (ch == '\r') { ch_state = 2; continue; }
685 if (ch != '\n') ch_state = 0; else linelength = -1;
689 body_linecount++; /* After unwritten "\r" */
690 if (linelength > max_received_linelength)
691 max_received_linelength = linelength;
699 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
700 if (ch == '\r') continue;
706 case 3: /* After "\n." (\n written, dot not) */
707 if (ch == '\n') return END_DOT;
708 if (ch == '\r') { ch_state = 4; continue; }
711 if (fputc('.', fout) == EOF) return END_WERROR;
715 case 4: /* After "\n.\r" (\n written, rest not) */
716 if (ch == '\n') return END_DOT;
719 if (fputs(".\n", fout) == EOF) return END_WERROR;
720 if (ch == '\r') { ch_state = 2; continue; }
726 if (fputc(ch, fout) == EOF) return END_WERROR;
727 if (++message_size > thismessage_size_limit) return END_SIZE;
730 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
731 the message ends with a newline, and we must also write any characters that
732 were saved up while testing for an ending dot. */
736 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
737 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
738 message_size += Ustrlen(ends[ch_state]);
748 /*************************************************
749 * Read data portion of an SMTP message *
750 *************************************************/
752 /* This function is called to read the remainder of an SMTP message (after the
753 headers), or to skip over it when an error has occurred. In this case, the
754 output file is passed as NULL.
756 If any line begins with a dot, that character is skipped. The input should only
757 be successfully terminated by CR LF . CR LF unless it is local (non-network)
758 SMTP, in which case the CRs are optional, but...
760 FUDGE: It seems that sites on the net send out messages with just LF
761 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
762 we make the CRs optional in all cases.
764 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
765 well, so that there are no CRs in spooled messages. However, the message
766 terminating dot is not recognized between two bare CRs.
769 fout a FILE to which to write the message; NULL if skipping
771 Returns: One of the END_xxx values indicating why it stopped reading
775 read_message_data_smtp(FILE *fout)
779 register int linelength = 0;
781 while ((ch = (receive_getc)()) != EOF)
783 if (ch == 0) body_zerocount++;
786 case 0: /* After LF or CRLF */
790 continue; /* Don't ever write . after LF */
794 /* Else fall through to handle as normal uschar. */
796 case 1: /* Normal state */
801 if (linelength > max_received_linelength)
802 max_received_linelength = linelength;
812 case 2: /* After (unwritten) CR */
814 if (linelength > max_received_linelength)
815 max_received_linelength = linelength;
824 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
825 (void) cutthrough_put_nl();
826 if (ch != '\r') ch_state = 1; else continue;
830 case 3: /* After [CR] LF . */
838 ch_state = 1; /* The dot itself is removed */
841 case 4: /* After [CR] LF . CR */
842 if (ch == '\n') return END_DOT;
845 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
846 (void) cutthrough_put_nl();
856 /* Add the character to the spool file, unless skipping; then loop for the
863 if (fputc(ch, fout) == EOF) return END_WERROR;
864 if (message_size > thismessage_size_limit) return END_SIZE;
867 (void) cutthrough_put_nl();
871 (void) cutthrough_puts(&c, 1);
875 /* Fall through here if EOF encountered. This indicates some kind of error,
876 since a correct message is terminated by [CR] LF . [CR] LF. */
884 /*************************************************
885 * Swallow SMTP message *
886 *************************************************/
888 /* This function is called when there has been some kind of error while reading
889 an SMTP message, and the remaining data may need to be swallowed. It is global
890 because it is called from smtp_closedown() to shut down an incoming call
893 Argument: a FILE from which to read the message
898 receive_swallow_smtp(void)
900 if (message_ended >= END_NOTENDED)
901 message_ended = read_message_data_smtp(NULL);
906 /*************************************************
907 * Handle lost SMTP connection *
908 *************************************************/
910 /* This function logs connection loss incidents and generates an appropriate
913 Argument: additional data for the message
914 Returns: the SMTP response
918 handle_lost_connection(uschar *s)
920 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
921 "%s lost while reading message data%s", smtp_get_connection_info(), s);
922 return US"421 Lost incoming connection";
928 /*************************************************
929 * Handle a non-smtp reception error *
930 *************************************************/
932 /* This function is called for various errors during the reception of non-SMTP
933 messages. It either sends a message to the sender of the problem message, or it
934 writes to the standard error stream.
937 errcode code for moan_to_sender(), identifying the error
938 text1 first message text, passed to moan_to_sender()
939 text2 second message text, used only for stderrr
940 error_rc code to pass to exim_exit if no problem
941 f FILE containing body of message (may be stdin)
942 hptr pointer to instore headers or NULL
944 Returns: calls exim_exit(), which does not return
948 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
949 FILE *f, header_line *hptr)
951 if (error_handling == ERRORS_SENDER)
955 eblock.text1 = text1;
956 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
957 error_rc = EXIT_FAILURE;
959 else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
966 /*************************************************
967 * Add header lines set up by ACL *
968 *************************************************/
970 /* This function is called to add the header lines that were set up by
971 statements in an ACL to the list of headers in memory. It is done in two stages
972 like this, because when the ACL for RCPT is running, the other headers have not
973 yet been received. This function is called twice; once just before running the
974 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
975 are visible to the DATA ACL.
977 Originally these header lines were added at the end. Now there is support for
978 three different places: top, bottom, and after the Received: header(s). There
979 will always be at least one Received: header, even if it is marked deleted, and
980 even if something else has been put in front of it.
983 acl_name text to identify which ACL
989 add_acl_headers(int where, uschar *acl_name)
991 header_line *h, *next;
992 header_line *last_received = NULL;
999 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1001 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1002 " will not take effect on cutthrough deliveries");
1007 if (acl_removed_headers != NULL)
1009 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1011 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1013 const uschar * list = acl_removed_headers;
1014 int sep = ':'; /* This is specified as a colon-separated list */
1018 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1019 if (header_testname(h, s, Ustrlen(s), FALSE))
1021 h->type = htype_old;
1022 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1025 acl_removed_headers = NULL;
1026 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1029 if (acl_added_headers == NULL) return;
1030 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1032 for (h = acl_added_headers; h != NULL; h = next)
1039 h->next = header_list;
1041 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1045 if (last_received == NULL)
1047 last_received = header_list;
1048 while (!header_testname(last_received, US"Received", 8, FALSE))
1049 last_received = last_received->next;
1050 while (last_received->next != NULL &&
1051 header_testname(last_received->next, US"Received", 8, FALSE))
1052 last_received = last_received->next;
1054 h->next = last_received->next;
1055 last_received->next = h;
1056 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1060 /* add header before any header which is NOT Received: or Resent- */
1061 last_received = header_list;
1062 while ( (last_received->next != NULL) &&
1063 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1064 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1065 last_received = last_received->next;
1066 /* last_received now points to the last Received: or Resent-* header
1067 in an uninterrupted chain of those header types (seen from the beginning
1068 of all headers. Our current header must follow it. */
1069 h->next = last_received->next;
1070 last_received->next = h;
1071 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1076 header_last->next = h;
1080 if (h->next == NULL) header_last = h;
1082 /* Check for one of the known header types (From:, To:, etc.) though in
1083 practice most added headers are going to be "other". Lower case
1084 identification letters are never stored with the header; they are used
1085 for existence tests when messages are received. So discard any lower case
1088 h->type = header_checkname(h, FALSE);
1089 if (h->type >= 'a') h->type = htype_other;
1091 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1094 acl_added_headers = NULL;
1095 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1100 /*************************************************
1101 * Add host information for log line *
1102 *************************************************/
1104 /* Called for acceptance and rejecting log lines. This adds information about
1105 the calling host to a string that is being built dynamically.
1108 s the dynamic string
1109 sizeptr points to the size variable
1110 ptrptr points to the pointer variable
1112 Returns: the extended string
1116 add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
1118 if (sender_fullhost != NULL)
1120 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1121 if ((log_extra_selector & LX_incoming_interface) != 0 &&
1122 interface_address != NULL)
1124 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1126 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1129 if (sender_ident != NULL)
1130 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1131 if (received_protocol != NULL)
1132 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1138 #ifdef WITH_CONTENT_SCAN
1140 /*************************************************
1141 * Run the MIME ACL on a message *
1142 *************************************************/
1144 /* This code is in a subroutine so that it can be used for both SMTP
1145 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1148 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1149 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1150 smtp_reply_ptr Where SMTP reply is being built
1151 blackholed_by_ptr Where "blackholed by" message is being built
1153 Returns: TRUE to carry on; FALSE to abandon the message
1157 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1158 uschar **blackholed_by_ptr)
1161 uschar rfc822_file_path[2048];
1162 unsigned long mbox_size;
1163 header_line *my_headerlist;
1164 uschar *user_msg, *log_msg;
1165 int mime_part_count_buffer = -1;
1168 memset(CS rfc822_file_path,0,2048);
1170 /* check if it is a MIME message */
1171 my_headerlist = header_list;
1172 while (my_headerlist != NULL)
1174 /* skip deleted headers */
1175 if (my_headerlist->type == '*')
1177 my_headerlist = my_headerlist->next;
1180 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1182 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1185 my_headerlist = my_headerlist->next;
1188 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1192 /* make sure the eml mbox file is spooled up */
1193 mbox_file = spool_mbox(&mbox_size, NULL);
1194 if (mbox_file == NULL) {
1195 /* error while spooling */
1196 log_write(0, LOG_MAIN|LOG_PANIC,
1197 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1198 Uunlink(spool_name);
1200 #ifdef EXPERIMENTAL_DCC
1203 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1204 message_id[0] = 0; /* Indicate no message accepted */
1205 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1206 return FALSE; /* Indicate skip to end of receive function */
1212 mime_part_count = -1;
1213 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1214 (void)fclose(mbox_file);
1216 if (Ustrlen(rfc822_file_path) > 0)
1218 mime_part_count = mime_part_count_buffer;
1220 if (unlink(CS rfc822_file_path) == -1)
1222 log_write(0, LOG_PANIC,
1223 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1228 /* check if we must check any message/rfc822 attachments */
1231 uschar temp_path[1024];
1232 struct dirent * entry;
1235 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1236 spool_directory, message_id);
1238 tempdir = opendir(CS temp_path);
1241 if (!(entry = readdir(tempdir)))
1243 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1245 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1246 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1247 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1256 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1258 /* set RFC822 expansion variable */
1260 mime_part_count_buffer = mime_part_count;
1261 goto MIME_ACL_CHECK;
1263 log_write(0, LOG_PANIC,
1264 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1265 unlink(CS rfc822_file_path);
1270 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1273 recipients_count = 0;
1274 *blackholed_by_ptr = US"MIME ACL";
1278 Uunlink(spool_name);
1280 #ifdef EXPERIMENTAL_DCC
1283 if (smtp_input && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0) {
1284 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1285 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1287 message_id[0] = 0; /* Indicate no message accepted */
1288 return FALSE; /* Cause skip to end of receive function */
1294 #endif /* WITH_CONTENT_SCAN */
1299 received_header_gen(void)
1303 header_line *received_header= header_list;
1305 timestamp = expand_string(US"${tod_full}");
1306 if (recipients_count == 1) received_for = recipients_list[0].address;
1307 received = expand_string(received_header_text);
1308 received_for = NULL;
1310 if (received == NULL)
1312 if(spool_name[0] != 0)
1313 Uunlink(spool_name); /* Lose the data file */
1314 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1315 "(received_header_text) failed: %s", string_printing(received_header_text),
1316 expand_string_message);
1319 /* The first element on the header chain is reserved for the Received header,
1320 so all we have to do is fill in the text pointer, and set the type. However, if
1321 the result of the expansion is an empty string, we leave the header marked as
1322 "old" so as to refrain from adding a Received header. */
1324 if (received[0] == 0)
1326 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1327 received_header->type = htype_old;
1331 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1332 received_header->type = htype_received;
1335 received_header->slen = Ustrlen(received_header->text);
1337 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1338 received_header->type, received_header->text);
1343 /*************************************************
1345 *************************************************/
1347 /* Receive a message on the given input, and put it into a pair of spool files.
1348 Either a non-null list of recipients, or the extract flag will be true, or
1349 both. The flag sender_local is true for locally generated messages. The flag
1350 submission_mode is true if an ACL has obeyed "control = submission". The flag
1351 suppress_local_fixups is true if an ACL has obeyed "control =
1352 suppress_local_fixups" or -G was passed on the command-line.
1353 The flag smtp_input is true if the message is to be
1354 handled using SMTP conventions about termination and lines starting with dots.
1355 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1357 If a message was successfully read, message_id[0] will be non-zero.
1359 The general actions of this function are:
1361 . Read the headers of the message (if any) into a chain of store
1364 . If there is a "sender:" header and the message is locally originated,
1365 throw it away, unless the caller is trusted, or unless
1366 active_local_sender_retain is set - which can only happen if
1367 active_local_from_check is false.
1369 . If recipients are to be extracted from the message, build the
1370 recipients list from the headers, removing any that were on the
1371 original recipients list (unless extract_addresses_remove_arguments is
1372 false), and at the same time, remove any bcc header that may be present.
1374 . Get the spool file for the data, sort out its unique name, open
1375 and lock it (but don't give it the name yet).
1377 . Generate a "Message-Id" header if the message doesn't have one, for
1378 locally-originated messages.
1380 . Generate a "Received" header.
1382 . Ensure the recipients list is fully qualified and rewritten if necessary.
1384 . If there are any rewriting rules, apply them to the sender address
1385 and also to the headers.
1387 . If there is no from: header, generate one, for locally-generated messages
1388 and messages in "submission mode" only.
1390 . If the sender is local, check that from: is correct, and if not, generate
1391 a Sender: header, unless message comes from a trusted caller, or this
1392 feature is disabled by active_local_from_check being false.
1394 . If there is no "date" header, generate one, for locally-originated
1395 or submission mode messages only.
1397 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1398 dot_ends mode, to the data file. Leave it open, to hold the lock.
1400 . Write the envelope and the headers to a new file.
1402 . Set the name for the header file; close it.
1404 . Set the name for the data file; close it.
1406 Because this function can potentially be called many times in a single
1407 SMTP connection, all store should be got by store_get(), so that it will be
1408 automatically retrieved after the message is accepted.
1410 FUDGE: It seems that sites on the net send out messages with just LF
1411 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1412 we make the CRs optional in all cases.
1414 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1415 new regime is now in place in which bare CRs in header lines are turned into LF
1416 followed by a space, so as not to terminate the header line.
1418 February 2004: A bare LF in a header line in a message whose first line was
1419 terminated by CRLF is treated in the same way as a bare CR.
1422 extract_recip TRUE if recipients are to be extracted from the message's
1425 Returns: TRUE there are more messages to be read (SMTP input)
1426 FALSE there are no more messages to be read (non-SMTP input
1427 or SMTP connection collapsed, or other failure)
1429 When reading a message for filter testing, the returned value indicates
1430 whether the headers (which is all that is read) were terminated by '.' or
1434 receive_msg(BOOL extract_recip)
1439 int process_info_len = Ustrlen(process_info);
1440 int error_rc = (error_handling == ERRORS_SENDER)?
1441 errors_sender_rc : EXIT_FAILURE;
1442 int header_size = 256;
1443 int start, end, domain, size, sptr;
1446 int prevlines_length = 0;
1448 register int ptr = 0;
1450 BOOL contains_resent_headers = FALSE;
1451 BOOL extracted_ignored = FALSE;
1452 BOOL first_line_ended_crlf = TRUE_UNSET;
1453 BOOL smtp_yield = TRUE;
1456 BOOL resents_exist = FALSE;
1457 uschar *resent_prefix = US"";
1458 uschar *blackholed_by = NULL;
1459 uschar *blackhole_log_msg = US"";
1460 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1463 error_block *bad_addresses = NULL;
1465 uschar *frozen_by = NULL;
1466 uschar *queued_by = NULL;
1469 struct stat statbuf;
1471 /* Final message to give to SMTP caller, and messages from ACLs */
1473 uschar *smtp_reply = NULL;
1474 uschar *user_msg, *log_msg;
1476 /* Working header pointers */
1478 header_line *h, *next;
1480 /* Flags for noting the existence of certain headers (only one left) */
1482 BOOL date_header_exists = FALSE;
1484 /* Pointers to receive the addresses of headers whose contents we need. */
1486 header_line *from_header = NULL;
1487 header_line *subject_header = NULL;
1488 header_line *msgid_header = NULL;
1489 header_line *received_header;
1491 #ifdef EXPERIMENTAL_DMARC
1493 #endif /* EXPERIMENTAL_DMARC */
1495 /* Variables for use when building the Received: header. */
1500 /* Release any open files that might have been cached while preparing to
1501 accept the message - e.g. by verifying addresses - because reading a message
1502 might take a fair bit of real time. */
1506 /* Extracting the recipient list from an input file is incompatible with
1507 cutthrough delivery with the no-spool option. It shouldn't be possible
1508 to set up the combination, but just in case kill any ongoing connection. */
1509 if (extract_recip || !smtp_input)
1510 cancel_cutthrough_connection("not smtp input");
1512 /* Initialize the chain of headers by setting up a place-holder for Received:
1513 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1514 pointing to the end of the chain to make adding headers simple. */
1516 received_header = header_list = header_last = store_get(sizeof(header_line));
1517 header_list->next = NULL;
1518 header_list->type = htype_old;
1519 header_list->text = NULL;
1520 header_list->slen = 0;
1522 /* Control block for the next header to be read. */
1524 next = store_get(sizeof(header_line));
1525 next->text = store_get(header_size);
1527 /* Initialize message id to be null (indicating no message read), and the
1528 header names list to be the normal list. Indicate there is no data file open
1529 yet, initialize the size and warning count, and deal with no size limit. */
1537 received_count = 1; /* For the one we will add */
1539 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1541 /* While reading the message, the following counts are computed. */
1543 message_linecount = body_linecount = body_zerocount =
1544 max_received_linelength = 0;
1546 #ifndef DISABLE_DKIM
1547 /* Call into DKIM to set up the context. */
1548 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1551 #ifdef EXPERIMENTAL_DMARC
1552 /* initialize libopendmarc */
1553 dmarc_up = dmarc_init();
1556 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1557 ids, and fractions of a second are required. See the comments that precede the
1558 message id creation below. */
1560 (void)gettimeofday(&message_id_tv, NULL);
1562 /* For other uses of the received time we can operate with granularity of one
1563 second, and for that we use the global variable received_time. This is for
1564 things like ultimate message timeouts. */
1566 received_time = message_id_tv.tv_sec;
1568 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1569 happen in the smtp_getc() function when it refills its buffer. */
1571 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1573 /* If not SMTP input, timeout happens only if configured, and we just set a
1574 single timeout for the whole message. */
1576 else if (receive_timeout > 0)
1578 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1579 alarm(receive_timeout);
1582 /* SIGTERM and SIGINT are caught always. */
1584 signal(SIGTERM, data_sigterm_sigint_handler);
1585 signal(SIGINT, data_sigterm_sigint_handler);
1587 /* Header lines in messages are not supposed to be very long, though when
1588 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1589 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1590 storing the header, and extend this as necessary using string_cat().
1592 To cope with total lunacies, impose an upper limit on the length of the header
1593 section of the message, as otherwise the store will fill up. We must also cope
1594 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1595 Folded header lines are joined into one string, leaving the '\n' characters
1596 inside them, so that writing them out reproduces the input.
1598 Loop for each character of each header; the next structure for chaining the
1599 header is set up already, with ptr the offset of the next character in
1604 int ch = (receive_getc)();
1606 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1607 SMTP must have a correct "." terminator. */
1609 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1611 smtp_reply = handle_lost_connection(US" (header)");
1613 goto TIDYUP; /* Skip to end of function */
1616 /* See if we are at the current header's size limit - there must be at least
1617 four bytes left. This allows for the new character plus a zero, plus two for
1618 extra insertions when we are playing games with dots and carriage returns. If
1619 we are at the limit, extend the text buffer. This could have been done
1620 automatically using string_cat() but because this is a tightish loop storing
1621 only one character at a time, we choose to do it inline. Normally
1622 store_extend() will be able to extend the block; only at the end of a big
1623 store block will a copy be needed. To handle the case of very long headers
1624 (and sometimes lunatic messages can have ones that are 100s of K long) we
1625 call store_release() for strings that have been copied - if the string is at
1626 the start of a block (and therefore the only thing in it, because we aren't
1627 doing any other gets), the block gets freed. We can only do this because we
1628 know there are no other calls to store_get() going on. */
1630 if (ptr >= header_size - 4)
1632 int oldsize = header_size;
1633 /* header_size += 256; */
1635 if (!store_extend(next->text, oldsize, header_size))
1637 uschar *newtext = store_get(header_size);
1638 memcpy(newtext, next->text, ptr);
1639 store_release(next->text);
1640 next->text = newtext;
1644 /* Cope with receiving a binary zero. There is dispute about whether
1645 these should be allowed in RFC 822 messages. The middle view is that they
1646 should not be allowed in headers, at least. Exim takes this attitude at
1647 the moment. We can't just stomp on them here, because we don't know that
1648 this line is a header yet. Set a flag to cause scanning later. */
1650 if (ch == 0) had_zero++;
1652 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1653 those from data files use just LF. Treat LF in local SMTP input as a
1654 terminator too. Treat EOF as a line terminator always. */
1656 if (ch == EOF) goto EOL;
1658 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1659 other MTAs accept this. We are therefore forced into this "liberalisation"
1660 too, so we accept LF as a line terminator whatever the source of the message.
1661 However, if the first line of the message ended with a CRLF, we treat a bare
1662 LF specially by inserting a white space after it to ensure that the header
1663 line is not terminated. */
1667 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1668 else if (first_line_ended_crlf) receive_ungetc(' ');
1672 /* This is not the end of the line. If this is SMTP input and this is
1673 the first character in the line and it is a "." character, ignore it.
1674 This implements the dot-doubling rule, though header lines starting with
1675 dots aren't exactly common. They are legal in RFC 822, though. If the
1676 following is CRLF or LF, this is the line that that terminates the
1677 entire message. We set message_ended to indicate this has happened (to
1678 prevent further reading), and break out of the loop, having freed the
1679 empty header, and set next = NULL to indicate no data line. */
1681 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1683 ch = (receive_getc)();
1686 ch = (receive_getc)();
1690 ch = '\r'; /* Revert to CR */
1695 message_ended = END_DOT;
1698 break; /* End character-reading loop */
1701 /* For non-SMTP input, the dot at the start of the line was really a data
1702 character. What is now in ch is the following character. We guaranteed
1703 enough space for this above. */
1707 next->text[ptr++] = '.';
1712 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1713 remember this case if this is the first line ending. */
1717 ch = (receive_getc)();
1720 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1724 /* Otherwise, put back the character after CR, and turn the bare CR
1727 ch = (receive_ungetc)(ch);
1728 next->text[ptr++] = '\n';
1733 /* We have a data character for the header line. */
1735 next->text[ptr++] = ch; /* Add to buffer */
1736 message_size++; /* Total message size so far */
1738 /* Handle failure due to a humungously long header section. The >= allows
1739 for the terminating \n. Add what we have so far onto the headers list so
1740 that it gets reflected in any error message, and back up the just-read
1743 if (message_size >= header_maxsize)
1745 next->text[ptr] = 0;
1747 next->type = htype_other;
1749 header_last->next = next;
1752 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1753 "%s (more than %d characters): message abandoned",
1754 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1758 smtp_reply = US"552 Message header is ridiculously long";
1759 receive_swallow_smtp();
1760 goto TIDYUP; /* Skip to end of function */
1765 give_local_error(ERRMESS_VLONGHEADER,
1766 string_sprintf("message header longer than %d characters received: "
1767 "message not accepted", header_maxsize), US"", error_rc, stdin,
1769 /* Does not return */
1773 continue; /* With next input character */
1775 /* End of header line reached */
1779 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1781 receive_linecount++;
1782 message_linecount++;
1784 /* Keep track of maximum line length */
1786 if (ptr - prevlines_length > max_received_linelength)
1787 max_received_linelength = ptr - prevlines_length;
1788 prevlines_length = ptr + 1;
1790 /* Now put in the terminating newline. There is always space for
1791 at least two more characters. */
1793 next->text[ptr++] = '\n';
1796 /* A blank line signals the end of the headers; release the unwanted
1797 space and set next to NULL to indicate this. */
1806 /* There is data in the line; see if the next input character is a
1807 whitespace character. If it is, we have a continuation of this header line.
1808 There is always space for at least one character at this point. */
1812 int nextch = (receive_getc)();
1813 if (nextch == ' ' || nextch == '\t')
1815 next->text[ptr++] = nextch;
1817 continue; /* Iterate the loop */
1819 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1820 else ch = EOF; /* Cause main loop to exit at end */
1823 /* We have got to the real line end. Terminate the string and release store
1824 beyond it. If it turns out to be a real header, internal binary zeros will
1825 be squashed later. */
1827 next->text[ptr] = 0;
1829 store_reset(next->text + ptr + 1);
1831 /* Check the running total size against the overall message size limit. We
1832 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1833 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1834 headers - the code to read the body will then also hit the buffer. */
1836 if (message_size > thismessage_size_limit) break;
1838 /* A line that is not syntactically correct for a header also marks
1839 the end of the headers. In this case, we leave next containing the
1840 first data line. This might actually be several lines because of the
1841 continuation logic applied above, but that doesn't matter.
1843 It turns out that smail, and presumably sendmail, accept leading lines
1846 From ph10 Fri Jan 5 12:35 GMT 1996
1848 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1849 find any documentation of this, but for compatibility it had better be
1850 accepted. Exim restricts it to the case of non-smtp messages, and
1851 treats it as an alternative to the -f command line option. Thus it is
1852 ignored except for trusted users or filter testing. Otherwise it is taken
1853 as the sender address, unless -f was used (sendmail compatibility).
1855 It further turns out that some UUCPs generate the From_line in a different
1858 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1860 The regex for matching these things is now capable of recognizing both
1861 formats (including 2- and 4-digit years in the latter). In fact, the regex
1862 is now configurable, as is the expansion string to fish out the sender.
1864 Even further on it has been discovered that some broken clients send
1865 these lines in SMTP messages. There is now an option to ignore them from
1866 specified hosts or networks. Sigh. */
1868 if (header_last == header_list &&
1871 (sender_host_address != NULL &&
1872 verify_check_host(&ignore_fromline_hosts) == OK)
1874 (sender_host_address == NULL && ignore_fromline_local)
1876 regex_match_and_setup(regex_From, next->text, 0, -1))
1878 if (!sender_address_forced)
1880 uschar *uucp_sender = expand_string(uucp_from_sender);
1881 if (uucp_sender == NULL)
1883 log_write(0, LOG_MAIN|LOG_PANIC,
1884 "expansion of \"%s\" failed after matching "
1885 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1889 int start, end, domain;
1891 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1892 &start, &end, &domain, TRUE);
1893 if (newsender != NULL)
1895 if (domain == 0 && newsender[0] != 0)
1896 newsender = rewrite_address_qualify(newsender, FALSE);
1898 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1900 sender_address = newsender;
1902 if (trusted_caller || filter_test != FTEST_NONE)
1904 authenticated_sender = NULL;
1905 originator_name = US"";
1906 sender_local = FALSE;
1909 if (filter_test != FTEST_NONE)
1910 printf("Sender taken from \"From \" line\n");
1917 /* Not a leading "From " line. Check to see if it is a valid header line.
1918 Header names may contain any non-control characters except space and colon,
1923 uschar *p = next->text;
1925 /* If not a valid header line, break from the header reading loop, leaving
1926 next != NULL, indicating that it holds the first line of the body. */
1928 if (isspace(*p)) break;
1929 while (mac_isgraph(*p) && *p != ':') p++;
1930 while (isspace(*p)) p++;
1933 body_zerocount = had_zero;
1937 /* We have a valid header line. If there were any binary zeroes in
1938 the line, stomp on them here. */
1941 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1943 /* It is perfectly legal to have an empty continuation line
1944 at the end of a header, but it is confusing to humans
1945 looking at such messages, since it looks like a blank line.
1946 Reduce confusion by removing redundant white space at the
1947 end. We know that there is at least one printing character
1948 (the ':' tested for above) so there is no danger of running
1951 p = next->text + ptr - 2;
1954 while (*p == ' ' || *p == '\t') p--;
1955 if (*p != '\n') break;
1956 ptr = (p--) - next->text + 1;
1957 message_size -= next->slen - ptr;
1958 next->text[ptr] = 0;
1962 /* Add the header to the chain */
1964 next->type = htype_other;
1966 header_last->next = next;
1969 /* Check the limit for individual line lengths. This comes after adding to
1970 the chain so that the failing line is reflected if a bounce is generated
1971 (for a local message). */
1973 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1975 log_write(0, LOG_MAIN, "overlong message header line received from "
1976 "%s (more than %d characters): message abandoned",
1977 sender_host_unknown? sender_ident : sender_fullhost,
1978 header_line_maxsize);
1982 smtp_reply = US"552 A message header line is too long";
1983 receive_swallow_smtp();
1984 goto TIDYUP; /* Skip to end of function */
1989 give_local_error(ERRMESS_VLONGHDRLINE,
1990 string_sprintf("message header line longer than %d characters "
1991 "received: message not accepted", header_line_maxsize), US"",
1992 error_rc, stdin, header_list->next);
1993 /* Does not return */
1997 /* Note if any resent- fields exist. */
1999 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2001 resents_exist = TRUE;
2002 resent_prefix = US"Resent-";
2006 /* The line has been handled. If we have hit EOF, break out of the loop,
2007 indicating no pending data line. */
2009 if (ch == EOF) { next = NULL; break; }
2011 /* Set up for the next header */
2014 next = store_get(sizeof(header_line));
2015 next->text = store_get(header_size);
2018 prevlines_length = 0;
2019 } /* Continue, starting to read the next header */
2021 /* At this point, we have read all the headers into a data structure in main
2022 store. The first header is still the dummy placeholder for the Received: header
2023 we are going to generate a bit later on. If next != NULL, it contains the first
2024 data line - which terminated the headers before reaching a blank line (not the
2029 debug_printf(">>Headers received:\n");
2030 for (h = header_list->next; h != NULL; h = h->next)
2031 debug_printf("%s", h->text);
2035 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2036 is dropped immediately after valid headers, the next thing we will see is EOF.
2037 We must test for this specially, as further down the reading of the data is
2038 skipped if already at EOF. */
2040 if (smtp_input && (receive_feof)())
2042 smtp_reply = handle_lost_connection(US" (after header)");
2044 goto TIDYUP; /* Skip to end of function */
2047 /* If this is a filter test run and no headers were read, output a warning
2048 in case there is a mistake in the test message. */
2050 if (filter_test != FTEST_NONE && header_list->next == NULL)
2051 printf("Warning: no message headers read\n");
2054 /* Scan the headers to identify them. Some are merely marked for later
2055 processing; some are dealt with here. */
2057 for (h = header_list->next; h != NULL; h = h->next)
2059 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2060 if (is_resent) contains_resent_headers = TRUE;
2062 switch (header_checkname(h, is_resent))
2065 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2069 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2072 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2075 if (!resents_exist || is_resent) date_header_exists = TRUE;
2078 /* Same comments as about Return-Path: below. */
2080 case htype_delivery_date:
2081 if (delivery_date_remove) h->type = htype_old;
2084 /* Same comments as about Return-Path: below. */
2086 case htype_envelope_to:
2087 if (envelope_to_remove) h->type = htype_old;
2090 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2091 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2092 header consists of just the login id of the user who called Exim, rewrite
2093 it with the gecos field first. Apply this rule to Resent-From: if there
2094 are resent- fields. */
2097 h->type = htype_from;
2098 if (!resents_exist || is_resent)
2104 uschar *s = Ustrchr(h->text, ':') + 1;
2105 while (isspace(*s)) s++;
2106 len = h->slen - (s - h->text) - 1;
2107 if (Ustrlen(originator_login) == len &&
2108 strncmpic(s, originator_login, len) == 0)
2110 uschar *name = is_resent? US"Resent-From" : US"From";
2111 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2112 originator_login, qualify_domain_sender);
2113 from_header = header_last;
2114 h->type = htype_old;
2115 DEBUG(D_receive|D_rewrite)
2116 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2122 /* Identify the Message-id: header for generating "in-reply-to" in the
2123 autoreply transport. For incoming logging, save any resent- value. In both
2124 cases, take just the first of any multiples. */
2127 if (msgid_header == NULL && (!resents_exist || is_resent))
2134 /* Flag all Received: headers */
2136 case htype_received:
2137 h->type = htype_received;
2141 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2143 case htype_reply_to:
2144 h->type = htype_reply_to;
2147 /* The Return-path: header is supposed to be added to messages when
2148 they leave the SMTP system. We shouldn't receive messages that already
2149 contain Return-path. However, since Exim generates Return-path: on
2150 local delivery, resent messages may well contain it. We therefore
2151 provide an option (which defaults on) to remove any Return-path: headers
2152 on input. Removal actually means flagging as "old", which prevents the
2153 header being transmitted with the message. */
2155 case htype_return_path:
2156 if (return_path_remove) h->type = htype_old;
2158 /* If we are testing a mail filter file, use the value of the
2159 Return-Path: header to set up the return_path variable, which is not
2160 otherwise set. However, remove any <> that surround the address
2161 because the variable doesn't have these. */
2163 if (filter_test != FTEST_NONE)
2165 uschar *start = h->text + 12;
2166 uschar *end = start + Ustrlen(start);
2167 while (isspace(*start)) start++;
2168 while (end > start && isspace(end[-1])) end--;
2169 if (*start == '<' && end[-1] == '>')
2174 return_path = string_copyn(start, end - start);
2175 printf("Return-path taken from \"Return-path:\" header line\n");
2179 /* If there is a "Sender:" header and the message is locally originated,
2180 and from an untrusted caller and suppress_local_fixups is not set, or if we
2181 are in submission mode for a remote message, mark it "old" so that it will
2182 not be transmitted with the message, unless active_local_sender_retain is
2183 set. (This can only be true if active_local_from_check is false.) If there
2184 are any resent- headers in the message, apply this rule to Resent-Sender:
2185 instead of Sender:. Messages with multiple resent- header sets cannot be
2186 tidily handled. (For this reason, at least one MUA - Pine - turns old
2187 resent- headers into X-resent- headers when resending, leaving just one
2191 h->type = ((!active_local_sender_retain &&
2193 (sender_local && !trusted_caller && !suppress_local_fixups)
2197 (!resents_exist||is_resent))?
2198 htype_old : htype_sender;
2201 /* Remember the Subject: header for logging. There is no Resent-Subject */
2207 /* "To:" gets flagged, and the existence of a recipient header is noted,
2208 whether it's resent- or not. */
2213 to_or_cc_header_exists = TRUE;
2219 /* Extract recipients from the headers if that is required (the -t option).
2220 Note that this is documented as being done *before* any address rewriting takes
2221 place. There are two possibilities:
2223 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2224 recipients already listed are to be REMOVED from the message. Smail 3 works
2225 like this. We need to build a non-recipients tree for that list, because in
2226 subsequent processing this data is held in a tree and that's what the
2227 spool_write_header() function expects. Make sure that non-recipient addresses
2228 are fully qualified and rewritten if necessary.
2230 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2231 those in the command line arguments (and it is rumoured some other MTAs do
2232 this). Therefore, there is an option to make Exim behave this way.
2234 *** Notes on "Resent-" header lines ***
2236 The presence of resent-headers in the message makes -t horribly ambiguous.
2237 Experiments with sendmail showed that it uses recipients for all resent-
2238 headers, totally ignoring the concept of "sets of resent- headers" as described
2239 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2240 with all the addresses in one instance of each header.
2242 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2243 error for -t if there were resent- headers in the message. However, after a
2244 discussion on the mailing list, I've learned that there are MUAs that use
2245 resent- headers with -t, and also that the stuff about sets of resent- headers
2246 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2247 message with -t and resent- header lines makes sure that only *its* resent-
2248 headers are present; previous ones are often renamed as X-resent- for example.
2250 Consequently, Exim has been changed so that, if any resent- header lines are
2251 present, the recipients are taken from all of the appropriate resent- lines,
2252 and not from the ordinary To:, Cc:, etc. */
2257 error_block **bnext = &bad_addresses;
2259 if (extract_addresses_remove_arguments)
2261 while (recipients_count-- > 0)
2263 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2264 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2265 tree_add_nonrecipient(s);
2267 recipients_list = NULL;
2268 recipients_count = recipients_list_max = 0;
2271 /* Now scan the headers */
2273 for (h = header_list->next; h != NULL; h = h->next)
2275 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2276 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2278 uschar *s = Ustrchr(h->text, ':') + 1;
2279 while (isspace(*s)) s++;
2281 parse_allow_group = TRUE; /* Allow address group syntax */
2285 uschar *ss = parse_find_address_end(s, FALSE);
2286 uschar *recipient, *errmess, *p, *pp;
2287 int start, end, domain;
2289 /* Check on maximum */
2291 if (recipients_max > 0 && ++rcount > recipients_max)
2293 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2294 US"message rejected: ", error_rc, stdin, NULL);
2295 /* Does not return */
2298 /* Make a copy of the address, and remove any internal newlines. These
2299 may be present as a result of continuations of the header line. The
2300 white space that follows the newline must not be removed - it is part
2303 pp = recipient = store_get(ss - s + 1);
2304 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2306 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2309 /* Keep a list of all the bad addresses so we can send a single
2310 error message at the end. However, an empty address is not an error;
2311 just ignore it. This can come from an empty group list like
2313 To: Recipients of list:;
2315 If there are no recipients at all, an error will occur later. */
2317 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2319 int len = Ustrlen(s);
2320 error_block *b = store_get(sizeof(error_block));
2321 while (len > 0 && isspace(s[len-1])) len--;
2323 b->text1 = string_printing(string_copyn(s, len));
2329 /* If the recipient is already in the nonrecipients tree, it must
2330 have appeared on the command line with the option extract_addresses_
2331 remove_arguments set. Do not add it to the recipients, and keep a note
2332 that this has happened, in order to give a better error if there are
2333 no recipients left. */
2335 else if (recipient != NULL)
2337 if (tree_search(tree_nonrecipients, recipient) == NULL)
2338 receive_add_recipient(recipient, -1);
2340 extracted_ignored = TRUE;
2343 /* Move on past this address */
2345 s = ss + (*ss? 1:0);
2346 while (isspace(*s)) s++;
2347 } /* Next address */
2349 parse_allow_group = FALSE; /* Reset group syntax flags */
2350 parse_found_group = FALSE;
2352 /* If this was the bcc: header, mark it "old", which means it
2353 will be kept on the spool, but not transmitted as part of the
2356 if (h->type == htype_bcc) h->type = htype_old;
2357 } /* For appropriate header line */
2358 } /* For each header line */
2362 /* Now build the unique message id. This has changed several times over the
2363 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2364 Retaining all the history in the comment has become too unwieldy - read
2365 previous release sources if you want it.
2367 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2368 The first part is the current time, in seconds. The second part is the current
2369 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2370 can hold a number in the range 0-3843. It used to be a computed sequence
2371 number, but is now the fractional component of the current time in units of
2372 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2373 received, Exim ensures that the timer has ticked at the appropriate level
2374 before proceeding, to avoid duplication if the pid happened to be re-used
2375 within the same time period. It seems likely that most messages will take at
2376 least half a millisecond to be received, so no delay will normally be
2377 necessary. At least for some time...
2379 There is a modification when localhost_number is set. Formerly this was allowed
2380 to be as large as 255. Now it is restricted to the range 0-16, and the final
2381 component of the message id becomes (localhost_number * 200) + fractional time
2382 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2384 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2385 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2386 still allows the tttttt field to hold a large enough number to last for some
2387 more decades, and the final two-digit field can hold numbers up to 1295, which
2388 is enough for milliseconds (instead of 1/2000 of a second).
2390 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2391 pid, so it is probably safe because pids have to be positive. The
2392 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2393 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2395 Note that string_base62() returns its data in a static storage block, so it
2396 must be copied before calling string_base62() again. It always returns exactly
2399 There doesn't seem to be anything in the RFC which requires a message id to
2400 start with a letter, but Smail was changed to ensure this. The external form of
2401 the message id (as supplied by string expansion) therefore starts with an
2402 additional leading 'E'. The spool file names do not include this leading
2403 letter and it is not used internally.
2405 NOTE: If ever the format of message ids is changed, the regular expression for
2406 checking that a string is in this format must be updated in a corresponding
2407 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2408 must also be changed to reflect the correct string length. Then, of course,
2409 other programs that rely on the message id format will need updating too. */
2411 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2412 message_id[6] = '-';
2413 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2415 /* Deal with the case where the host number is set. The value of the number was
2416 checked when it was read, to ensure it isn't too big. The timing granularity is
2417 left in id_resolution so that an appropriate wait can be done after receiving
2418 the message, if necessary (we hope it won't be). */
2420 if (host_number_string != NULL)
2422 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2423 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2424 string_base62((long int)(
2425 host_number * (1000000/id_resolution) +
2426 message_id_tv.tv_usec/id_resolution)) + 4);
2429 /* Host number not set: final field is just the fractional time at an
2430 appropriate resolution. */
2434 id_resolution = (BASE_62 == 62)? 500 : 1000;
2435 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2436 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2439 /* Add the current message id onto the current process info string if
2442 (void)string_format(process_info + process_info_len,
2443 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2445 /* If we are using multiple input directories, set up the one for this message
2446 to be the least significant base-62 digit of the time of arrival. Otherwise
2447 ensure that it is an empty string. */
2449 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2451 /* Now that we have the message-id, if there is no message-id: header, generate
2452 one, but only for local (without suppress_local_fixups) or submission mode
2453 messages. This can be user-configured if required, but we had better flatten
2454 any illegal characters therein. */
2456 if (msgid_header == NULL &&
2457 ((sender_host_address == NULL && !suppress_local_fixups)
2458 || submission_mode))
2461 uschar *id_text = US"";
2462 uschar *id_domain = primary_hostname;
2464 /* Permit only letters, digits, dots, and hyphens in the domain */
2466 if (message_id_domain != NULL)
2468 uschar *new_id_domain = expand_string(message_id_domain);
2469 if (new_id_domain == NULL)
2471 if (!expand_string_forcedfail)
2472 log_write(0, LOG_MAIN|LOG_PANIC,
2473 "expansion of \"%s\" (message_id_header_domain) "
2474 "failed: %s", message_id_domain, expand_string_message);
2476 else if (*new_id_domain != 0)
2478 id_domain = new_id_domain;
2479 for (p = id_domain; *p != 0; p++)
2480 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2484 /* Permit all characters except controls and RFC 2822 specials in the
2485 additional text part. */
2487 if (message_id_text != NULL)
2489 uschar *new_id_text = expand_string(message_id_text);
2490 if (new_id_text == NULL)
2492 if (!expand_string_forcedfail)
2493 log_write(0, LOG_MAIN|LOG_PANIC,
2494 "expansion of \"%s\" (message_id_header_text) "
2495 "failed: %s", message_id_text, expand_string_message);
2497 else if (*new_id_text != 0)
2499 id_text = new_id_text;
2500 for (p = id_text; *p != 0; p++)
2501 if (mac_iscntrl_or_special(*p)) *p = '-';
2505 /* Add the header line
2506 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2507 * appended, to preserve classical expectations of header ordering. */
2509 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2510 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2511 (*id_text == 0)? "" : ".", id_text, id_domain);
2514 /* If we are to log recipients, keep a copy of the raw ones before any possible
2515 rewriting. Must copy the count, because later ACLs and the local_scan()
2516 function may mess with the real recipients. */
2518 if ((log_extra_selector & LX_received_recipients) != 0)
2520 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2521 for (i = 0; i < recipients_count; i++)
2522 raw_recipients[i] = string_copy(recipients_list[i].address);
2523 raw_recipients_count = recipients_count;
2526 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2527 recipients will get here only if the conditions were right (allow_unqualified_
2528 recipient is TRUE). */
2530 for (i = 0; i < recipients_count; i++)
2531 recipients_list[i].address =
2532 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2533 global_rewrite_rules, rewrite_existflags);
2535 /* If there is no From: header, generate one for local (without
2536 suppress_local_fixups) or submission_mode messages. If there is no sender
2537 address, but the sender is local or this is a local delivery error, use the
2538 originator login. This shouldn't happen for genuine bounces, but might happen
2539 for autoreplies. The addition of From: must be done *before* checking for the
2540 possible addition of a Sender: header, because untrusted_set_sender allows an
2541 untrusted user to set anything in the envelope (which might then get info
2542 From:) but we still want to ensure a valid Sender: if it is required. */
2544 if (from_header == NULL &&
2545 ((sender_host_address == NULL && !suppress_local_fixups)
2546 || submission_mode))
2548 uschar *oname = US"";
2550 /* Use the originator_name if this is a locally submitted message and the
2551 caller is not trusted. For trusted callers, use it only if -F was used to
2552 force its value or if we have a non-SMTP message for which -f was not used
2553 to set the sender. */
2555 if (sender_host_address == NULL)
2557 if (!trusted_caller || sender_name_forced ||
2558 (!smtp_input && !sender_address_forced))
2559 oname = originator_name;
2562 /* For non-locally submitted messages, the only time we use the originator
2563 name is when it was forced by the /name= option on control=submission. */
2567 if (submission_name != NULL) oname = submission_name;
2570 /* Envelope sender is empty */
2572 if (sender_address[0] == 0)
2574 uschar *fromstart, *fromend;
2576 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2577 oname, (oname[0] == 0)? "" : " <");
2578 fromend = (oname[0] == 0)? US"" : US">";
2580 if (sender_local || local_error_message)
2582 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2583 local_part_quote(originator_login), qualify_domain_sender,
2586 else if (submission_mode && authenticated_id != NULL)
2588 if (submission_domain == NULL)
2590 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2591 local_part_quote(authenticated_id), qualify_domain_sender,
2594 else if (submission_domain[0] == 0) /* empty => whole address set */
2596 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2601 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2602 local_part_quote(authenticated_id), submission_domain,
2605 from_header = header_last; /* To get it checked for Sender: */
2609 /* There is a non-null envelope sender. Build the header using the original
2610 sender address, before any rewriting that might have been done while
2615 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2617 (oname[0] == 0)? "" : " <",
2618 (sender_address_unrewritten == NULL)?
2619 sender_address : sender_address_unrewritten,
2620 (oname[0] == 0)? "" : ">");
2622 from_header = header_last; /* To get it checked for Sender: */
2627 /* If the sender is local (without suppress_local_fixups), or if we are in
2628 submission mode and there is an authenticated_id, check that an existing From:
2629 is correct, and if not, generate a Sender: header, unless disabled. Any
2630 previously-existing Sender: header was removed above. Note that sender_local,
2631 as well as being TRUE if the caller of exim is not trusted, is also true if a
2632 trusted caller did not supply a -f argument for non-smtp input. To allow
2633 trusted callers to forge From: without supplying -f, we have to test explicitly
2634 here. If the From: header contains more than one address, then the call to
2635 parse_extract_address fails, and a Sender: header is inserted, as required. */
2637 if (from_header != NULL &&
2638 (active_local_from_check &&
2639 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2640 (submission_mode && authenticated_id != NULL))
2643 BOOL make_sender = TRUE;
2644 int start, end, domain;
2646 uschar *from_address =
2647 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2648 &start, &end, &domain, FALSE);
2649 uschar *generated_sender_address;
2651 if (submission_mode)
2653 if (submission_domain == NULL)
2655 generated_sender_address = string_sprintf("%s@%s",
2656 local_part_quote(authenticated_id), qualify_domain_sender);
2658 else if (submission_domain[0] == 0) /* empty => full address */
2660 generated_sender_address = string_sprintf("%s",
2665 generated_sender_address = string_sprintf("%s@%s",
2666 local_part_quote(authenticated_id), submission_domain);
2670 generated_sender_address = string_sprintf("%s@%s",
2671 local_part_quote(originator_login), qualify_domain_sender);
2673 /* Remove permitted prefixes and suffixes from the local part of the From:
2674 address before doing the comparison with the generated sender. */
2676 if (from_address != NULL)
2679 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2681 if (at != NULL) *at = 0;
2682 from_address += route_check_prefix(from_address, local_from_prefix);
2683 slen = route_check_suffix(from_address, local_from_suffix);
2686 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2687 from_address += slen;
2689 if (at != NULL) *at = '@';
2691 if (strcmpic(generated_sender_address, from_address) == 0 ||
2692 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2693 make_sender = FALSE;
2696 /* We have to cause the Sender header to be rewritten if there are
2697 appropriate rewriting rules. */
2701 if (submission_mode && submission_name == NULL)
2702 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2703 generated_sender_address);
2705 header_add(htype_sender, "%sSender: %s <%s>\n",
2707 submission_mode? submission_name : originator_name,
2708 generated_sender_address);
2711 /* Ensure that a non-null envelope sender address corresponds to the
2712 submission mode sender address. */
2714 if (submission_mode && sender_address[0] != 0)
2716 if (sender_address_unrewritten == NULL)
2717 sender_address_unrewritten = sender_address;
2718 sender_address = generated_sender_address;
2719 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2720 log_write(L_address_rewrite, LOG_MAIN,
2721 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2722 sender_address_unrewritten, generated_sender_address);
2726 /* If there are any rewriting rules, apply them to the sender address, unless
2727 it has already been rewritten as part of verification for SMTP input. */
2729 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2730 sender_address[0] != 0)
2732 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2733 global_rewrite_rules, rewrite_existflags);
2734 DEBUG(D_receive|D_rewrite)
2735 debug_printf("rewritten sender = %s\n", sender_address);
2739 /* The headers must be run through rewrite_header(), because it ensures that
2740 addresses are fully qualified, as well as applying any rewriting rules that may
2743 Qualification of header addresses in a message from a remote host happens only
2744 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2745 appropriate. For local messages, qualification always happens, unless -bnq is
2746 used to explicitly suppress it. No rewriting is done for an unqualified address
2747 that is left untouched.
2749 We start at the second header, skipping our own Received:. This rewriting is
2750 documented as happening *after* recipient addresses are taken from the headers
2751 by the -t command line option. An added Sender: gets rewritten here. */
2753 for (h = header_list->next; h != NULL; h = h->next)
2755 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2756 rewrite_existflags, TRUE);
2757 if (newh != NULL) h = newh;
2761 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2762 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2763 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2764 exists, this applies to the set of resent- headers rather than the normal set.
2766 The requirement for a recipient header has been removed in RFC 2822. At this
2767 point in the code, earlier versions of Exim added a To: header for locally
2768 submitted messages, and an empty Bcc: header for others. In the light of the
2769 changes in RFC 2822, this was dropped in November 2003. */
2772 /* If there is no date header, generate one if the message originates locally
2773 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2774 submission mode flag is set. Messages without Date: are not valid, but it seems
2775 to be more confusing if Exim adds one to all remotely-originated messages.
2776 As per Message-Id, we prepend if resending, else append.
2779 if (!date_header_exists &&
2780 ((sender_host_address == NULL && !suppress_local_fixups)
2781 || submission_mode))
2782 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2783 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2785 search_tidyup(); /* Free any cached resources */
2787 /* Show the complete set of headers if debugging. Note that the first one (the
2788 new Received:) has not yet been set. */
2792 debug_printf(">>Headers after rewriting and local additions:\n");
2793 for (h = header_list->next; h != NULL; h = h->next)
2794 debug_printf("%c %s", h->type, h->text);
2798 /* The headers are now complete in store. If we are running in filter
2799 testing mode, that is all this function does. Return TRUE if the message
2800 ended with a dot. */
2802 if (filter_test != FTEST_NONE)
2804 process_info[process_info_len] = 0;
2805 return message_ended == END_DOT;
2808 /* Cutthrough delivery:
2809 We have to create the Received header now rather than at the end of reception,
2810 so the timestamp behaviour is a change to the normal case.
2811 XXX Ensure this gets documented XXX.
2812 Having created it, send the headers to the destination. */
2813 if (cutthrough.fd >= 0)
2815 if (received_count > received_headers_max)
2817 cancel_cutthrough_connection("too many headers");
2818 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2819 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2820 "Too many \"Received\" headers",
2822 (sender_fullhost == NULL)? "" : " H=",
2823 (sender_fullhost == NULL)? US"" : sender_fullhost,
2824 (sender_ident == NULL)? "" : " U=",
2825 (sender_ident == NULL)? US"" : sender_ident);
2826 message_id[0] = 0; /* Indicate no message accepted */
2827 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2828 goto TIDYUP; /* Skip to end of function */
2830 received_header_gen();
2831 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2832 (void) cutthrough_headers_send();
2836 /* Open a new spool file for the data portion of the message. We need
2837 to access it both via a file descriptor and a stream. Try to make the
2838 directory if it isn't there. Note re use of sprintf: spool_directory
2839 is checked on input to be < 200 characters long. */
2841 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2843 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2846 if (errno == ENOENT)
2849 sprintf(CS temp, "input/%s", message_subdir);
2850 if (message_subdir[0] == 0) temp[5] = 0;
2851 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2852 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2855 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2856 spool_name, strerror(errno));
2859 /* Make sure the file's group is the Exim gid, and double-check the mode
2860 because the group setting doesn't always get set automatically. */
2862 if (fchown(data_fd, exim_uid, exim_gid))
2863 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2864 "Failed setting ownership on spool file %s: %s",
2865 spool_name, strerror(errno));
2866 (void)fchmod(data_fd, SPOOL_MODE);
2868 /* We now have data file open. Build a stream for it and lock it. We lock only
2869 the first line of the file (containing the message ID) because otherwise there
2870 are problems when Exim is run under Cygwin (I'm told). See comments in
2871 spool_in.c, where the same locking is done. */
2873 data_file = fdopen(data_fd, "w+");
2874 lock_data.l_type = F_WRLCK;
2875 lock_data.l_whence = SEEK_SET;
2876 lock_data.l_start = 0;
2877 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2879 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2880 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2881 errno, strerror(errno));
2883 /* We have an open, locked data file. Write the message id to it to make it
2884 self-identifying. Then read the remainder of the input of this message and
2885 write it to the data file. If the variable next != NULL, it contains the first
2886 data line (which was read as a header but then turned out not to have the right
2887 format); write it (remembering that it might contain binary zeros). The result
2888 of fwrite() isn't inspected; instead we call ferror() below. */
2890 fprintf(data_file, "%s-D\n", message_id);
2893 uschar *s = next->text;
2894 int len = next->slen;
2895 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2896 body_linecount++; /* Assumes only 1 line */
2899 /* Note that we might already be at end of file, or the logical end of file
2900 (indicated by '.'), or might have encountered an error while writing the
2901 message id or "next" line. */
2903 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2907 message_ended = read_message_data_smtp(data_file);
2908 receive_linecount++; /* The terminating "." line */
2910 else message_ended = read_message_data(data_file);
2912 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2913 message_linecount += body_linecount;
2915 /* Handle premature termination of SMTP */
2917 if (smtp_input && message_ended == END_EOF)
2919 Uunlink(spool_name); /* Lose data file when closed */
2920 cancel_cutthrough_connection("sender closed connection");
2921 message_id[0] = 0; /* Indicate no message accepted */
2922 smtp_reply = handle_lost_connection(US"");
2924 goto TIDYUP; /* Skip to end of function */
2927 /* Handle message that is too big. Don't use host_or_ident() in the log
2928 message; we want to see the ident value even for non-remote messages. */
2930 if (message_ended == END_SIZE)
2932 Uunlink(spool_name); /* Lose the data file when closed */
2933 cancel_cutthrough_connection("mail too big");
2934 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2936 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2937 "message too big: read=%d max=%d",
2939 (sender_fullhost == NULL)? "" : " H=",
2940 (sender_fullhost == NULL)? US"" : sender_fullhost,
2941 (sender_ident == NULL)? "" : " U=",
2942 (sender_ident == NULL)? US"" : sender_ident,
2944 thismessage_size_limit);
2948 smtp_reply = US"552 Message size exceeds maximum permitted";
2949 message_id[0] = 0; /* Indicate no message accepted */
2950 goto TIDYUP; /* Skip to end of function */
2954 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2955 give_local_error(ERRMESS_TOOBIG,
2956 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2957 US"message rejected: ", error_rc, data_file, header_list);
2958 /* Does not return */
2963 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2964 example, there may be some expansion in an ACL that uses a timer.) */
2966 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2968 /* The message body has now been read into the data file. Call fflush() to
2969 empty the buffers in C, and then call fsync() to get the data written out onto
2970 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2971 having to do this). If there was an I/O error on either input or output,
2972 attempt to send an error message, and unlink the spool file. For non-SMTP input
2973 we can then give up. Note that for SMTP input we must swallow the remainder of
2974 the input in cases of output errors, since the far end doesn't expect to see
2975 anything until the terminating dot line is sent. */
2977 if (fflush(data_file) == EOF || ferror(data_file) ||
2978 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2980 uschar *msg_errno = US strerror(errno);
2981 BOOL input_error = (receive_ferror)() != 0;
2982 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2983 input_error? "Input read" : "Spool write",
2985 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2987 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2988 Uunlink(spool_name); /* Lose the data file */
2989 cancel_cutthrough_connection("error writing spoolfile");
2994 smtp_reply = US"451 Error while reading input data";
2997 smtp_reply = US"451 Error while writing spool file";
2998 receive_swallow_smtp();
3000 message_id[0] = 0; /* Indicate no message accepted */
3001 goto TIDYUP; /* Skip to end of function */
3006 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3007 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3009 /* Does not return */
3014 /* No I/O errors were encountered while writing the data file. */
3016 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3019 /* If there were any bad addresses extracted by -t, or there were no recipients
3020 left after -t, send a message to the sender of this message, or write it to
3021 stderr if the error handling option is set that way. Note that there may
3022 legitimately be no recipients for an SMTP message if they have all been removed
3025 We need to rewind the data file in order to read it. In the case of no
3026 recipients or stderr error writing, throw the data file away afterwards, and
3027 exit. (This can't be SMTP, which always ensures there's at least one
3028 syntactically good recipient address.) */
3030 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3034 if (recipients_count == 0) debug_printf("*** No recipients\n");
3035 if (bad_addresses != NULL)
3037 error_block *eblock = bad_addresses;
3038 debug_printf("*** Bad address(es)\n");
3039 while (eblock != NULL)
3041 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3042 eblock = eblock->next;
3047 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3049 /* If configured to send errors to the sender, but this fails, force
3050 a failure error code. We use a special one for no recipients so that it
3051 can be detected by the autoreply transport. Otherwise error_rc is set to
3052 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3053 it is EXIT_SUCCESS. */
3055 if (error_handling == ERRORS_SENDER)
3057 if (!moan_to_sender(
3058 (bad_addresses == NULL)?
3059 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3060 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3061 bad_addresses, header_list, data_file, FALSE))
3062 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3066 if (bad_addresses == NULL)
3068 if (extracted_ignored)
3069 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3071 fprintf(stderr, "exim: no recipients in message\n");
3075 fprintf(stderr, "exim: invalid address%s",
3076 (bad_addresses->next == NULL)? ":" : "es:\n");
3077 while (bad_addresses != NULL)
3079 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3080 bad_addresses->text2);
3081 bad_addresses = bad_addresses->next;
3086 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3088 Uunlink(spool_name);
3089 (void)fclose(data_file);
3090 exim_exit(error_rc);
3094 /* Data file successfully written. Generate text for the Received: header by
3095 expanding the configured string, and adding a timestamp. By leaving this
3096 operation till now, we ensure that the timestamp is the time that message
3097 reception was completed. However, this is deliberately done before calling the
3098 data ACL and local_scan().
3100 This Received: header may therefore be inspected by the data ACL and by code in
3101 the local_scan() function. When they have run, we update the timestamp to be
3102 the final time of reception.
3104 If there is just one recipient, set up its value in the $received_for variable
3105 for use when we generate the Received: header.
3107 Note: the checking for too many Received: headers is handled by the delivery
3109 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3111 if (received_header->text == NULL) /* Non-cutthrough case */
3113 received_header_gen();
3115 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3117 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3118 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3120 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3121 now, before running the DATA ACL. */
3123 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3126 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3127 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3129 /* If an ACL is specified for checking things at this stage of reception of a
3130 message, run it, unless all the recipients were removed by "discard" in earlier
3131 ACLs. That is the only case in which recipients_count can be zero at this
3132 stage. Set deliver_datafile to point to the data file so that $message_body and
3133 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3136 deliver_datafile = data_fd;
3139 enable_dollar_recipients = TRUE;
3141 if (recipients_count == 0)
3143 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3147 /* Handle interactive SMTP messages */
3149 if (smtp_input && !smtp_batched_input)
3152 #ifndef DISABLE_DKIM
3153 if (!dkim_disable_verify)
3155 /* Finish verification, this will log individual signature results to
3157 dkim_exim_verify_finish();
3159 /* Check if we must run the DKIM ACL */
3160 if ((acl_smtp_dkim != NULL) &&
3161 (dkim_verify_signers != NULL) &&
3162 (dkim_verify_signers[0] != '\0'))
3164 uschar *dkim_verify_signers_expanded =
3165 expand_string(dkim_verify_signers);
3166 if (dkim_verify_signers_expanded == NULL)
3168 log_write(0, LOG_MAIN|LOG_PANIC,
3169 "expansion of dkim_verify_signers option failed: %s",
3170 expand_string_message);
3175 const uschar *ptr = dkim_verify_signers_expanded;
3176 uschar *item = NULL;
3177 uschar *seen_items = NULL;
3178 int seen_items_size = 0;
3179 int seen_items_offset = 0;
3180 uschar itembuf[256];
3181 /* Default to OK when no items are present */
3183 while ((item = string_nextinlist(&ptr, &sep,
3187 /* Prevent running ACL for an empty item */
3188 if (!item || (item[0] == '\0')) continue;
3190 /* Only run ACL once for each domain or identity,
3191 no matter how often it appears in the expanded list. */
3194 uschar *seen_item = NULL;
3195 uschar seen_item_buf[256];
3196 const uschar *seen_items_list = seen_items;
3197 BOOL seen_this_item = FALSE;
3199 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3201 sizeof(seen_item_buf))))
3202 if (Ustrcmp(seen_item,item) == 0)
3204 seen_this_item = TRUE;
3211 debug_printf("acl_smtp_dkim: skipping signer %s, "
3212 "already seen\n", item);
3216 seen_items = string_append(seen_items, &seen_items_size,
3217 &seen_items_offset, 1, ":");
3220 seen_items = string_append(seen_items, &seen_items_size,
3221 &seen_items_offset, 1, item);
3222 seen_items[seen_items_offset] = '\0';
3225 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3228 dkim_exim_acl_setup(item);
3229 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3230 &user_msg, &log_msg);
3235 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3236 "skipping remaining items\n", rc, item);
3237 cancel_cutthrough_connection("dkim acl not ok");
3241 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3244 recipients_count = 0;
3245 blackholed_by = US"DKIM ACL";
3246 if (log_msg != NULL)
3247 blackhole_log_msg = string_sprintf(": %s", log_msg);
3251 Uunlink(spool_name);
3252 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3253 smtp_yield = FALSE; /* No more messsages after dropped connection */
3254 smtp_reply = US""; /* Indicate reply already sent */
3255 message_id[0] = 0; /* Indicate no message accepted */
3256 goto TIDYUP; /* Skip to end of function */
3261 #endif /* DISABLE_DKIM */
3263 #ifdef WITH_CONTENT_SCAN
3264 if (recipients_count > 0 &&
3265 acl_smtp_mime != NULL &&
3266 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3268 #endif /* WITH_CONTENT_SCAN */
3270 #ifdef EXPERIMENTAL_DMARC
3271 dmarc_up = dmarc_store_data(from_header);
3272 #endif /* EXPERIMENTAL_DMARC */
3274 #ifndef DISABLE_PRDR
3275 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3279 int all_fail = FAIL;
3281 smtp_printf("353 PRDR content analysis beginning\r\n");
3282 /* Loop through recipients, responses must be in same order received */
3283 for (c = 0; recipients_count > c; c++)
3285 uschar * addr= recipients_list[c].address;
3286 uschar * msg= US"PRDR R=<%s> %s";
3289 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3290 addr, c+1, recipients_count);
3291 rc = acl_check(ACL_WHERE_PRDR, addr,
3292 acl_smtp_data_prdr, &user_msg, &log_msg);
3294 /* If any recipient rejected content, indicate it in final message */
3296 /* If all recipients rejected, indicate in final message */
3301 case OK: case DISCARD: code = US"250"; break;
3302 case DEFER: code = US"450"; break;
3303 default: code = US"550"; break;
3305 if (user_msg != NULL)
3306 smtp_user_msg(code, user_msg);
3311 case OK: case DISCARD:
3312 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3314 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3316 msg = string_sprintf(CS msg, addr, "refusal"); break;
3318 smtp_user_msg(code, msg);
3320 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3321 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3322 else log_write(0, LOG_MAIN, "%s", CS msg);
3324 if (rc != OK) { receive_remove_recipient(addr); c--; }
3326 /* Set up final message, used if data acl gives OK */
3327 smtp_reply = string_sprintf("%s id=%s message %s",
3328 all_fail == FAIL ? US"550" : US"250",
3331 ? US"rejected for all recipients"
3334 : US"accepted for some recipients");
3335 if (recipients_count == 0)
3337 message_id[0] = 0; /* Indicate no message accepted */
3342 prdr_requested = FALSE;
3343 #endif /* !DISABLE_PRDR */
3345 /* Check the recipients count again, as the MIME ACL might have changed
3348 if (acl_smtp_data != NULL && recipients_count > 0)
3350 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3351 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3354 recipients_count = 0;
3355 blackholed_by = US"DATA ACL";
3356 if (log_msg != NULL)
3357 blackhole_log_msg = string_sprintf(": %s", log_msg);
3358 cancel_cutthrough_connection("data acl discard");
3362 Uunlink(spool_name);
3363 cancel_cutthrough_connection("data acl not ok");
3364 #ifdef WITH_CONTENT_SCAN
3367 #ifdef EXPERIMENTAL_DCC
3370 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3371 smtp_yield = FALSE; /* No more messsages after dropped connection */
3372 smtp_reply = US""; /* Indicate reply already sent */
3373 message_id[0] = 0; /* Indicate no message accepted */
3374 goto TIDYUP; /* Skip to end of function */
3379 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3380 we cannot take different actions for permanent and temporary rejections. */
3385 #ifdef WITH_CONTENT_SCAN
3386 if (acl_not_smtp_mime != NULL &&
3387 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3390 #endif /* WITH_CONTENT_SCAN */
3392 if (acl_not_smtp != NULL)
3394 uschar *user_msg, *log_msg;
3395 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3398 recipients_count = 0;
3399 blackholed_by = US"non-SMTP ACL";
3400 if (log_msg != NULL)
3401 blackhole_log_msg = string_sprintf(": %s", log_msg);
3405 Uunlink(spool_name);
3406 #ifdef WITH_CONTENT_SCAN
3409 #ifdef EXPERIMENTAL_DCC
3412 /* The ACL can specify where rejections are to be logged, possibly
3413 nowhere. The default is main and reject logs. */
3415 if (log_reject_target != 0)
3416 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3417 sender_address, log_msg);
3419 if (user_msg == NULL) user_msg = US"local configuration problem";
3420 if (smtp_batched_input)
3422 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3423 /* Does not return */
3427 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3428 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3429 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3431 /* Does not return */
3434 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3438 /* The applicable ACLs have been run */
3440 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3441 if (queue_only_policy) queued_by = US"ACL";
3444 #ifdef WITH_CONTENT_SCAN
3448 #ifdef EXPERIMENTAL_DCC
3453 /* The final check on the message is to run the scan_local() function. The
3454 version supplied with Exim always accepts, but this is a hook for sysadmins to
3455 supply their own checking code. The local_scan() function is run even when all
3456 the recipients have been discarded. */
3458 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3460 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3461 deleted, and the incident gets logged. */
3463 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3464 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3465 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3466 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3468 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3469 local_scan_timeout);
3470 local_scan_data = NULL;
3472 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3473 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3474 rc = local_scan(data_fd, &local_scan_data);
3476 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3478 enable_dollar_recipients = FALSE;
3480 store_pool = POOL_MAIN; /* In case changed */
3481 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3484 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3485 os_non_restarting_signal(SIGFPE, SIG_DFL);
3486 os_non_restarting_signal(SIGILL, SIG_DFL);
3487 os_non_restarting_signal(SIGBUS, SIG_DFL);
3489 /* The length check is paranoia against some runaway code, and also because
3490 (for a success return) lines in the spool file are read into big_buffer. */
3492 if (local_scan_data != NULL)
3494 int len = Ustrlen(local_scan_data);
3495 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3496 local_scan_data = string_copyn(local_scan_data, len);
3499 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3501 if (!deliver_freeze) /* ACL might have already frozen */
3503 deliver_freeze = TRUE;
3504 deliver_frozen_at = time(NULL);
3505 frozen_by = US"local_scan()";
3507 rc = LOCAL_SCAN_ACCEPT;
3509 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3511 if (!queue_only_policy) /* ACL might have already queued */
3513 queue_only_policy = TRUE;
3514 queued_by = US"local_scan()";
3516 rc = LOCAL_SCAN_ACCEPT;
3519 /* Message accepted: remove newlines in local_scan_data because otherwise
3520 the spool file gets corrupted. Ensure that all recipients are qualified. */
3522 if (rc == LOCAL_SCAN_ACCEPT)
3524 if (local_scan_data != NULL)
3527 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3529 for (i = 0; i < recipients_count; i++)
3531 recipient_item *r = recipients_list + i;
3532 r->address = rewrite_address_qualify(r->address, TRUE);
3533 if (r->errors_to != NULL)
3534 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3536 if (recipients_count == 0 && blackholed_by == NULL)
3537 blackholed_by = US"local_scan";
3540 /* Message rejected: newlines permitted in local_scan_data to generate
3541 multiline SMTP responses. */
3545 uschar *istemp = US"";
3551 errmsg = local_scan_data;
3553 Uunlink(spool_name); /* Cancel this message */
3557 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3558 "rejection given", rc);
3561 case LOCAL_SCAN_REJECT_NOLOGHDR:
3562 log_extra_selector &= ~LX_rejected_header;
3565 case LOCAL_SCAN_REJECT:
3566 smtp_code = US"550";
3567 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3570 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3571 log_extra_selector &= ~LX_rejected_header;
3574 case LOCAL_SCAN_TEMPREJECT:
3576 smtp_code = US"451";
3577 if (errmsg == NULL) errmsg = US"Temporary local problem";
3578 istemp = US"temporarily ";
3582 s = string_append(s, &size, &sptr, 2, US"F=",
3583 (sender_address[0] == 0)? US"<>" : sender_address);
3584 s = add_host_info_for_log(s, &size, &sptr);
3587 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3588 s, istemp, string_printing(errmsg));
3592 if (!smtp_batched_input)
3594 smtp_respond(smtp_code, 3, TRUE, errmsg);
3595 message_id[0] = 0; /* Indicate no message accepted */
3596 smtp_reply = US""; /* Indicate reply already sent */
3597 goto TIDYUP; /* Skip to end of function */
3601 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3602 /* Does not return */
3607 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3608 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3609 US"message rejected by local scan code: ", error_rc, data_file,
3611 /* Does not return */
3615 /* Reset signal handlers to ignore signals that previously would have caused
3616 the message to be abandoned. */
3618 signal(SIGTERM, SIG_IGN);
3619 signal(SIGINT, SIG_IGN);
3622 /* Ensure the first time flag is set in the newly-received message. */
3624 deliver_firsttime = TRUE;
3626 #ifdef EXPERIMENTAL_BRIGHTMAIL
3628 /* rewind data file */
3629 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3630 bmi_verdicts = bmi_process_message(header_list, data_fd);
3634 /* Update the timstamp in our Received: header to account for any time taken by
3635 an ACL or by local_scan(). The new time is the time that all reception
3636 processing is complete. */
3638 timestamp = expand_string(US"${tod_full}");
3639 tslen = Ustrlen(timestamp);
3641 memcpy(received_header->text + received_header->slen - tslen - 1,
3644 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3648 deliver_freeze = FALSE;
3649 queue_only_policy = FALSE;
3652 /* Keep the data file open until we have written the header file, in order to
3653 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3654 don't write the header file, and we unlink the data file. If writing the header
3655 file fails, we have failed to accept this message. */
3657 if (host_checking || blackholed_by != NULL)
3660 Uunlink(spool_name);
3661 msg_size = 0; /* Compute size for log line */
3662 for (h = header_list; h != NULL; h = h->next)
3663 if (h->type != '*') msg_size += h->slen;
3666 /* Write the -H file */
3670 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3672 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3673 Uunlink(spool_name); /* Lose the data file */
3677 smtp_reply = US"451 Error in writing spool file";
3678 message_id[0] = 0; /* Indicate no message accepted */
3683 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3684 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3686 /* Does not return */
3692 /* The message has now been successfully received. */
3694 receive_messagecount++;
3696 /* In SMTP sessions we may receive several in one connection. After each one,
3697 we wait for the clock to tick at the level of message-id granularity. This is
3698 so that the combination of time+pid is unique, even on systems where the pid
3699 can be re-used within our time interval. We can't shorten the interval without
3700 re-designing the message-id. See comments above where the message id is
3701 created. This is Something For The Future. */
3703 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3704 exim_wait_tick(&message_id_tv, id_resolution);
3706 /* Add data size to written header size. We do not count the initial file name
3707 that is in the file, but we do add one extra for the notional blank line that
3708 precedes the data. This total differs from message_size in that it include the
3709 added Received: header and any other headers that got created locally. */
3712 fstat(data_fd, &statbuf);
3714 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3716 /* Generate a "message received" log entry. We do this by building up a dynamic
3717 string as required. Since we commonly want to add two items at a time, use a
3718 macro to simplify the coding. We log the arrival of a new message while the
3719 file is still locked, just in case the machine is *really* fast, and delivers
3720 it first! Include any message id that is in the message - since the syntax of a
3721 message id is actually an addr-spec, we can use the parse routine to canonicize
3726 s = store_get(size);
3728 s = string_append(s, &size, &sptr, 2, US"<= ",
3729 (sender_address[0] == 0)? US"<>" : sender_address);
3730 if (message_reference != NULL)
3731 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3733 s = add_host_info_for_log(s, &size, &sptr);
3736 if (log_extra_selector & LX_tls_cipher && tls_in.cipher)
3737 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3738 if (log_extra_selector & LX_tls_certificate_verified && tls_in.cipher)
3739 s = string_append(s, &size, &sptr, 2, US" CV=",
3740 tls_in.certificate_verified? "yes":"no");
3741 if (log_extra_selector & LX_tls_peerdn && tls_in.peerdn)
3742 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3743 string_printing(tls_in.peerdn), US"\"");
3744 if (log_extra_selector & LX_tls_sni && tls_in.sni)
3745 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3746 string_printing(tls_in.sni), US"\"");
3749 if (sender_host_authenticated)
3751 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3752 if (authenticated_id != NULL)
3754 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3755 if (log_extra_selector & LX_smtp_mailauth && authenticated_sender != NULL)
3756 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3760 #ifndef DISABLE_PRDR
3762 s = string_append(s, &size, &sptr, 1, US" PRDR");
3765 #ifdef EXPERIMENTAL_PROXY
3766 if (proxy_session && log_extra_selector & LX_proxy)
3767 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_host_address);
3770 sprintf(CS big_buffer, "%d", msg_size);
3771 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3773 /* log 8BITMIME mode announced in MAIL_FROM
3777 if (log_extra_selector & LX_8bitmime)
3779 sprintf(CS big_buffer, "%d", body_8bitmime);
3780 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3783 /* If an addr-spec in a message-id contains a quoted string, it can contain
3784 any characters except " \ and CR and so in particular it can contain NL!
3785 Therefore, make sure we use a printing-characters only version for the log.
3786 Also, allow for domain literals in the message id. */
3788 if (msgid_header != NULL)
3791 BOOL save_allow_domain_literals = allow_domain_literals;
3792 allow_domain_literals = TRUE;
3793 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3794 &errmsg, &start, &end, &domain, FALSE);
3795 allow_domain_literals = save_allow_domain_literals;
3797 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3800 /* If subject logging is turned on, create suitable printing-character
3801 text. By expanding $h_subject: we make use of the MIME decoding. */
3803 if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3806 uschar *p = big_buffer;
3807 uschar *ss = expand_string(US"$h_subject:");
3809 /* Backslash-quote any double quotes or backslashes so as to make a
3810 a C-like string, and turn any non-printers into escape sequences. */
3813 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3815 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3820 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3823 /* Terminate the string: string_cat() and string_append() leave room, but do
3824 not put the zero in. */
3828 /* Create a message log file if message logs are being used and this message is
3829 not blackholed. Write the reception stuff to it. We used to leave message log
3830 creation until the first delivery, but this has proved confusing for some
3833 if (message_logs && blackholed_by == NULL)
3837 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3839 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3841 if (fd < 0 && errno == ENOENT)
3844 sprintf(CS temp, "msglog/%s", message_subdir);
3845 if (message_subdir[0] == 0) temp[6] = 0;
3846 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3847 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3852 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3853 spool_name, strerror(errno));
3858 FILE *message_log = fdopen(fd, "a");
3859 if (message_log == NULL)
3861 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3862 spool_name, strerror(errno));
3867 uschar *now = tod_stamp(tod_log);
3868 fprintf(message_log, "%s Received from %s\n", now, s+3);
3869 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3871 if (queue_only_policy) fprintf(message_log,
3872 "%s no immediate delivery: queued by %s\n", now, queued_by);
3873 (void)fclose(message_log);
3878 /* Everything has now been done for a successful message except logging its
3879 arrival, and outputting an SMTP response. While writing to the log, set a flag
3880 to cause a call to receive_bomb_out() if the log cannot be opened. */
3882 receive_call_bombout = TRUE;
3884 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3885 connection has gone away. This can only be done if there is no unconsumed input
3886 waiting in the local input buffer. We can test for this by calling
3887 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3888 input to be sent following the final dot, so the presence of following input is
3891 If the connection is still present, but there is no unread input for the
3892 socket, the result of a select() call will be zero. If, however, the connection
3893 has gone away, or if there is pending input, the result of select() will be
3894 non-zero. The two cases can be distinguished by trying to read the next input
3895 character. If we succeed, we can unread it so that it remains in the local
3896 buffer for handling later. If not, the connection has been lost.
3898 Of course, since TCP/IP is asynchronous, there is always a chance that the
3899 connection will vanish between the time of this test and the sending of the
3900 response, but the chance of this happening should be small. */
3902 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3903 !receive_smtp_buffered())
3906 fd_set select_check;
3907 FD_ZERO(&select_check);
3908 FD_SET(fileno(smtp_in), &select_check);
3912 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3914 int c = (receive_getc)();
3915 if (c != EOF) (receive_ungetc)(c); else
3917 uschar *msg = US"SMTP connection lost after final dot";
3918 smtp_reply = US""; /* No attempt to send a response */
3919 smtp_yield = FALSE; /* Nothing more on this connection */
3921 /* Re-use the log line workspace */
3924 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3925 s = add_host_info_for_log(s, &size, &sptr);
3927 log_write(0, LOG_MAIN, "%s", s);
3929 /* Delete the files for this aborted message. */
3931 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3932 message_subdir, message_id);
3933 Uunlink(spool_name);
3935 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3936 message_subdir, message_id);
3937 Uunlink(spool_name);
3939 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3940 message_subdir, message_id);
3941 Uunlink(spool_name);
3948 /* The connection has not gone away; we really are going to take responsibility
3949 for this message. */
3951 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
3954 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
3955 the sender's dot (below).
3956 If rejected: copy response to sender, wipe the spooled files, log approriately.
3957 If temp-reject: accept to sender, keep the spooled files.
3959 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3961 XXX We do not handle queue-only, freezing, or blackholes.
3963 if(cutthrough.fd >= 0)
3965 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the messsage */
3966 /* Logging was done in finaldot() */
3969 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3970 cutthrough_done = ACCEPTED;
3971 break; /* message_id needed for SMTP accept below */
3973 default: /* Unknown response, or error. Treat as temp-reject. */
3974 case '4': /* Temp-reject. Keep spoolfiles and accept. */
3975 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
3976 break; /* message_id needed for SMTP accept below */
3978 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
3979 smtp_reply= msg; /* Pass on the exact error */
3980 cutthrough_done = PERM_REJ;
3985 #ifndef DISABLE_PRDR
3986 if(!smtp_reply || prdr_requested)
3991 log_write(0, LOG_MAIN |
3992 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3993 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3996 /* Log any control actions taken by an ACL or local_scan(). */
3998 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3999 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4000 "no immediate delivery: queued by %s", queued_by);
4002 receive_call_bombout = FALSE;
4004 store_reset(s); /* The store for the main log message can be reused */
4006 /* If the message is frozen, and freeze_tell is set, do the telling. */
4008 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4010 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4011 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4012 message_id, frozen_by, sender_address);
4016 /* Either a message has been successfully received and written to the two spool
4017 files, or an error in writing the spool has occurred for an SMTP message, or
4018 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4019 we will have already given up because there's no point in carrying on!) In
4020 either event, we must now close (and thereby unlock) the data file. In the
4021 successful case, this leaves the message on the spool, ready for delivery. In
4022 the error case, the spool file will be deleted. Then tidy up store, interact
4023 with an SMTP call if necessary, and return.
4025 A fflush() was done earlier in the expectation that any write errors on the
4026 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4027 possible for fclose() to fail - but what to do? What has happened to the lock
4032 process_info[process_info_len] = 0; /* Remove message id */
4033 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4035 /* Now reset signal handlers to their defaults */
4037 signal(SIGTERM, SIG_DFL);
4038 signal(SIGINT, SIG_DFL);
4040 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4041 value, which defaults TRUE - meaning there may be more incoming messages from
4042 this connection. For non-SMTP callers (where there is only ever one message),
4043 the default is FALSE. */
4049 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4050 is set to the response that should be sent. When it is NULL, we generate
4051 default responses. After an ACL error or local_scan() error, the response has
4052 already been sent, and smtp_reply is an empty string to indicate this. */
4054 if (!smtp_batched_input)
4056 if (smtp_reply == NULL)
4058 if (fake_response != OK)
4059 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4060 fake_response_text);
4062 /* An OK response is required; use "message" text if present. */
4064 else if (user_msg != NULL)
4066 uschar *code = US"250";
4068 smtp_message_code(&code, &len, &user_msg, NULL);
4069 smtp_respond(code, len, TRUE, user_msg);
4072 /* Default OK response */
4075 smtp_printf("250 OK id=%s\r\n", message_id);
4078 "\n**** SMTP testing: that is not a real message id!\n\n");
4081 /* smtp_reply is set non-empty */
4083 else if (smtp_reply[0] != 0)
4085 if (fake_response != OK && (smtp_reply[0] == '2'))
4086 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4087 fake_response_text);
4089 smtp_printf("%.1024s\r\n", smtp_reply);
4092 switch (cutthrough_done)
4094 case ACCEPTED: log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4095 case PERM_REJ: { /* Delete spool files */
4096 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
4097 message_subdir, message_id);
4098 Uunlink(spool_name);
4099 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
4100 message_subdir, message_id);
4101 Uunlink(spool_name);
4102 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
4103 message_subdir, message_id);
4104 Uunlink(spool_name);
4106 case TMP_REJ: message_id[0] = 0; /* Prevent a delivery from starting */
4109 cutthrough.delivery = FALSE;
4112 /* For batched SMTP, generate an error message on failure, and do
4113 nothing on success. The function moan_smtp_batch() does not return -
4114 it exits from the program with a non-zero return code. */
4116 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
4120 /* If blackholing, we can immediately log this message's sad fate. The data
4121 file has already been unlinked, and the header file was never written to disk.
4122 We must now indicate that nothing was received, to prevent a delivery from
4125 if (blackholed_by != NULL)
4127 const uschar *detail = local_scan_data
4128 ? string_printing(local_scan_data)
4129 : string_sprintf("(%s discarded recipients)", blackholed_by);
4130 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4131 log_write(0, LOG_MAIN, "Completed");
4135 /* Reset headers so that logging of rejects for a subsequent message doesn't
4136 include them. It is also important to set header_last = NULL before exiting
4137 from this function, as this prevents certain rewrites that might happen during
4138 subsequent verifying (of another incoming message) from trying to add headers
4139 when they shouldn't. */
4141 header_list = header_last = NULL;
4143 return yield; /* TRUE if more messages (SMTP only) */
4146 /* End of receive.c */