1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
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, TRUE);
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 (LOGGING(incoming_interface) && interface_address != NULL)
1123 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
1125 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1128 if (sender_ident != NULL)
1129 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1130 if (received_protocol != NULL)
1131 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1137 #ifdef WITH_CONTENT_SCAN
1139 /*************************************************
1140 * Run the MIME ACL on a message *
1141 *************************************************/
1143 /* This code is in a subroutine so that it can be used for both SMTP
1144 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1147 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1148 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1149 smtp_reply_ptr Where SMTP reply is being built
1150 blackholed_by_ptr Where "blackholed by" message is being built
1152 Returns: TRUE to carry on; FALSE to abandon the message
1156 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1157 uschar **blackholed_by_ptr)
1160 uschar rfc822_file_path[2048];
1161 unsigned long mbox_size;
1162 header_line *my_headerlist;
1163 uschar *user_msg, *log_msg;
1164 int mime_part_count_buffer = -1;
1167 memset(CS rfc822_file_path,0,2048);
1169 /* check if it is a MIME message */
1170 my_headerlist = header_list;
1171 while (my_headerlist != NULL)
1173 /* skip deleted headers */
1174 if (my_headerlist->type == '*')
1176 my_headerlist = my_headerlist->next;
1179 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1181 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1184 my_headerlist = my_headerlist->next;
1187 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1191 /* make sure the eml mbox file is spooled up */
1192 mbox_file = spool_mbox(&mbox_size, NULL);
1193 if (mbox_file == NULL) {
1194 /* error while spooling */
1195 log_write(0, LOG_MAIN|LOG_PANIC,
1196 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1197 Uunlink(spool_name);
1199 #ifdef EXPERIMENTAL_DCC
1202 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1203 message_id[0] = 0; /* Indicate no message accepted */
1204 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1205 return FALSE; /* Indicate skip to end of receive function */
1211 mime_part_count = -1;
1212 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1213 (void)fclose(mbox_file);
1215 if (Ustrlen(rfc822_file_path) > 0)
1217 mime_part_count = mime_part_count_buffer;
1219 if (unlink(CS rfc822_file_path) == -1)
1221 log_write(0, LOG_PANIC,
1222 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1227 /* check if we must check any message/rfc822 attachments */
1230 uschar temp_path[1024];
1231 struct dirent * entry;
1234 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1235 spool_directory, message_id);
1237 tempdir = opendir(CS temp_path);
1240 if (!(entry = readdir(tempdir)))
1242 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1244 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1245 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1246 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1255 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1257 /* set RFC822 expansion variable */
1259 mime_part_count_buffer = mime_part_count;
1260 goto MIME_ACL_CHECK;
1262 log_write(0, LOG_PANIC,
1263 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1264 unlink(CS rfc822_file_path);
1269 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1272 recipients_count = 0;
1273 *blackholed_by_ptr = US"MIME ACL";
1277 Uunlink(spool_name);
1279 #ifdef EXPERIMENTAL_DCC
1283 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1285 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1286 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1288 message_id[0] = 0; /* Indicate no message accepted */
1289 return FALSE; /* Cause skip to end of receive function */
1295 #endif /* WITH_CONTENT_SCAN */
1300 received_header_gen(void)
1304 header_line *received_header= header_list;
1306 timestamp = expand_string(US"${tod_full}");
1307 if (recipients_count == 1) received_for = recipients_list[0].address;
1308 received = expand_string(received_header_text);
1309 received_for = NULL;
1311 if (received == NULL)
1313 if(spool_name[0] != 0)
1314 Uunlink(spool_name); /* Lose the data file */
1315 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1316 "(received_header_text) failed: %s", string_printing(received_header_text),
1317 expand_string_message);
1320 /* The first element on the header chain is reserved for the Received header,
1321 so all we have to do is fill in the text pointer, and set the type. However, if
1322 the result of the expansion is an empty string, we leave the header marked as
1323 "old" so as to refrain from adding a Received header. */
1325 if (received[0] == 0)
1327 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1328 received_header->type = htype_old;
1332 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1333 received_header->type = htype_received;
1336 received_header->slen = Ustrlen(received_header->text);
1338 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1339 received_header->type, received_header->text);
1344 /*************************************************
1346 *************************************************/
1348 /* Receive a message on the given input, and put it into a pair of spool files.
1349 Either a non-null list of recipients, or the extract flag will be true, or
1350 both. The flag sender_local is true for locally generated messages. The flag
1351 submission_mode is true if an ACL has obeyed "control = submission". The flag
1352 suppress_local_fixups is true if an ACL has obeyed "control =
1353 suppress_local_fixups" or -G was passed on the command-line.
1354 The flag smtp_input is true if the message is to be
1355 handled using SMTP conventions about termination and lines starting with dots.
1356 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1358 If a message was successfully read, message_id[0] will be non-zero.
1360 The general actions of this function are:
1362 . Read the headers of the message (if any) into a chain of store
1365 . If there is a "sender:" header and the message is locally originated,
1366 throw it away, unless the caller is trusted, or unless
1367 active_local_sender_retain is set - which can only happen if
1368 active_local_from_check is false.
1370 . If recipients are to be extracted from the message, build the
1371 recipients list from the headers, removing any that were on the
1372 original recipients list (unless extract_addresses_remove_arguments is
1373 false), and at the same time, remove any bcc header that may be present.
1375 . Get the spool file for the data, sort out its unique name, open
1376 and lock it (but don't give it the name yet).
1378 . Generate a "Message-Id" header if the message doesn't have one, for
1379 locally-originated messages.
1381 . Generate a "Received" header.
1383 . Ensure the recipients list is fully qualified and rewritten if necessary.
1385 . If there are any rewriting rules, apply them to the sender address
1386 and also to the headers.
1388 . If there is no from: header, generate one, for locally-generated messages
1389 and messages in "submission mode" only.
1391 . If the sender is local, check that from: is correct, and if not, generate
1392 a Sender: header, unless message comes from a trusted caller, or this
1393 feature is disabled by active_local_from_check being false.
1395 . If there is no "date" header, generate one, for locally-originated
1396 or submission mode messages only.
1398 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1399 dot_ends mode, to the data file. Leave it open, to hold the lock.
1401 . Write the envelope and the headers to a new file.
1403 . Set the name for the header file; close it.
1405 . Set the name for the data file; close it.
1407 Because this function can potentially be called many times in a single
1408 SMTP connection, all store should be got by store_get(), so that it will be
1409 automatically retrieved after the message is accepted.
1411 FUDGE: It seems that sites on the net send out messages with just LF
1412 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1413 we make the CRs optional in all cases.
1415 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1416 new regime is now in place in which bare CRs in header lines are turned into LF
1417 followed by a space, so as not to terminate the header line.
1419 February 2004: A bare LF in a header line in a message whose first line was
1420 terminated by CRLF is treated in the same way as a bare CR.
1423 extract_recip TRUE if recipients are to be extracted from the message's
1426 Returns: TRUE there are more messages to be read (SMTP input)
1427 FALSE there are no more messages to be read (non-SMTP input
1428 or SMTP connection collapsed, or other failure)
1430 When reading a message for filter testing, the returned value indicates
1431 whether the headers (which is all that is read) were terminated by '.' or
1435 receive_msg(BOOL extract_recip)
1440 int process_info_len = Ustrlen(process_info);
1441 int error_rc = (error_handling == ERRORS_SENDER)?
1442 errors_sender_rc : EXIT_FAILURE;
1443 int header_size = 256;
1444 int start, end, domain, size, sptr;
1447 int prevlines_length = 0;
1449 register int ptr = 0;
1451 BOOL contains_resent_headers = FALSE;
1452 BOOL extracted_ignored = FALSE;
1453 BOOL first_line_ended_crlf = TRUE_UNSET;
1454 BOOL smtp_yield = TRUE;
1457 BOOL resents_exist = FALSE;
1458 uschar *resent_prefix = US"";
1459 uschar *blackholed_by = NULL;
1460 uschar *blackhole_log_msg = US"";
1461 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1464 error_block *bad_addresses = NULL;
1466 uschar *frozen_by = NULL;
1467 uschar *queued_by = NULL;
1470 struct stat statbuf;
1472 /* Final message to give to SMTP caller, and messages from ACLs */
1474 uschar *smtp_reply = NULL;
1475 uschar *user_msg, *log_msg;
1477 /* Working header pointers */
1479 header_line *h, *next;
1481 /* Flags for noting the existence of certain headers (only one left) */
1483 BOOL date_header_exists = FALSE;
1485 /* Pointers to receive the addresses of headers whose contents we need. */
1487 header_line *from_header = NULL;
1488 header_line *subject_header = NULL;
1489 header_line *msgid_header = NULL;
1490 header_line *received_header;
1492 #ifdef EXPERIMENTAL_DMARC
1494 #endif /* EXPERIMENTAL_DMARC */
1496 /* Variables for use when building the Received: header. */
1501 /* Release any open files that might have been cached while preparing to
1502 accept the message - e.g. by verifying addresses - because reading a message
1503 might take a fair bit of real time. */
1507 /* Extracting the recipient list from an input file is incompatible with
1508 cutthrough delivery with the no-spool option. It shouldn't be possible
1509 to set up the combination, but just in case kill any ongoing connection. */
1510 if (extract_recip || !smtp_input)
1511 cancel_cutthrough_connection("not smtp input");
1513 /* Initialize the chain of headers by setting up a place-holder for Received:
1514 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1515 pointing to the end of the chain to make adding headers simple. */
1517 received_header = header_list = header_last = store_get(sizeof(header_line));
1518 header_list->next = NULL;
1519 header_list->type = htype_old;
1520 header_list->text = NULL;
1521 header_list->slen = 0;
1523 /* Control block for the next header to be read. */
1525 next = store_get(sizeof(header_line));
1526 next->text = store_get(header_size);
1528 /* Initialize message id to be null (indicating no message read), and the
1529 header names list to be the normal list. Indicate there is no data file open
1530 yet, initialize the size and warning count, and deal with no size limit. */
1538 received_count = 1; /* For the one we will add */
1540 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1542 /* While reading the message, the following counts are computed. */
1544 message_linecount = body_linecount = body_zerocount =
1545 max_received_linelength = 0;
1547 #ifndef DISABLE_DKIM
1548 /* Call into DKIM to set up the context. */
1549 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1552 #ifdef EXPERIMENTAL_DMARC
1553 /* initialize libopendmarc */
1554 dmarc_up = dmarc_init();
1557 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1558 ids, and fractions of a second are required. See the comments that precede the
1559 message id creation below. */
1561 (void)gettimeofday(&message_id_tv, NULL);
1563 /* For other uses of the received time we can operate with granularity of one
1564 second, and for that we use the global variable received_time. This is for
1565 things like ultimate message timeouts. */
1567 received_time = message_id_tv.tv_sec;
1569 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1570 happen in the smtp_getc() function when it refills its buffer. */
1572 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1574 /* If not SMTP input, timeout happens only if configured, and we just set a
1575 single timeout for the whole message. */
1577 else if (receive_timeout > 0)
1579 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1580 alarm(receive_timeout);
1583 /* SIGTERM and SIGINT are caught always. */
1585 signal(SIGTERM, data_sigterm_sigint_handler);
1586 signal(SIGINT, data_sigterm_sigint_handler);
1588 /* Header lines in messages are not supposed to be very long, though when
1589 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1590 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1591 storing the header, and extend this as necessary using string_cat().
1593 To cope with total lunacies, impose an upper limit on the length of the header
1594 section of the message, as otherwise the store will fill up. We must also cope
1595 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1596 Folded header lines are joined into one string, leaving the '\n' characters
1597 inside them, so that writing them out reproduces the input.
1599 Loop for each character of each header; the next structure for chaining the
1600 header is set up already, with ptr the offset of the next character in
1605 int ch = (receive_getc)();
1607 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1608 SMTP must have a correct "." terminator. */
1610 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1612 smtp_reply = handle_lost_connection(US" (header)");
1614 goto TIDYUP; /* Skip to end of function */
1617 /* See if we are at the current header's size limit - there must be at least
1618 four bytes left. This allows for the new character plus a zero, plus two for
1619 extra insertions when we are playing games with dots and carriage returns. If
1620 we are at the limit, extend the text buffer. This could have been done
1621 automatically using string_cat() but because this is a tightish loop storing
1622 only one character at a time, we choose to do it inline. Normally
1623 store_extend() will be able to extend the block; only at the end of a big
1624 store block will a copy be needed. To handle the case of very long headers
1625 (and sometimes lunatic messages can have ones that are 100s of K long) we
1626 call store_release() for strings that have been copied - if the string is at
1627 the start of a block (and therefore the only thing in it, because we aren't
1628 doing any other gets), the block gets freed. We can only do this because we
1629 know there are no other calls to store_get() going on. */
1631 if (ptr >= header_size - 4)
1633 int oldsize = header_size;
1634 /* header_size += 256; */
1636 if (!store_extend(next->text, oldsize, header_size))
1638 uschar *newtext = store_get(header_size);
1639 memcpy(newtext, next->text, ptr);
1640 store_release(next->text);
1641 next->text = newtext;
1645 /* Cope with receiving a binary zero. There is dispute about whether
1646 these should be allowed in RFC 822 messages. The middle view is that they
1647 should not be allowed in headers, at least. Exim takes this attitude at
1648 the moment. We can't just stomp on them here, because we don't know that
1649 this line is a header yet. Set a flag to cause scanning later. */
1651 if (ch == 0) had_zero++;
1653 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1654 those from data files use just LF. Treat LF in local SMTP input as a
1655 terminator too. Treat EOF as a line terminator always. */
1657 if (ch == EOF) goto EOL;
1659 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1660 other MTAs accept this. We are therefore forced into this "liberalisation"
1661 too, so we accept LF as a line terminator whatever the source of the message.
1662 However, if the first line of the message ended with a CRLF, we treat a bare
1663 LF specially by inserting a white space after it to ensure that the header
1664 line is not terminated. */
1668 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1669 else if (first_line_ended_crlf) receive_ungetc(' ');
1673 /* This is not the end of the line. If this is SMTP input and this is
1674 the first character in the line and it is a "." character, ignore it.
1675 This implements the dot-doubling rule, though header lines starting with
1676 dots aren't exactly common. They are legal in RFC 822, though. If the
1677 following is CRLF or LF, this is the line that that terminates the
1678 entire message. We set message_ended to indicate this has happened (to
1679 prevent further reading), and break out of the loop, having freed the
1680 empty header, and set next = NULL to indicate no data line. */
1682 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1684 ch = (receive_getc)();
1687 ch = (receive_getc)();
1691 ch = '\r'; /* Revert to CR */
1696 message_ended = END_DOT;
1699 break; /* End character-reading loop */
1702 /* For non-SMTP input, the dot at the start of the line was really a data
1703 character. What is now in ch is the following character. We guaranteed
1704 enough space for this above. */
1708 next->text[ptr++] = '.';
1713 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1714 remember this case if this is the first line ending. */
1718 ch = (receive_getc)();
1721 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1725 /* Otherwise, put back the character after CR, and turn the bare CR
1728 ch = (receive_ungetc)(ch);
1729 next->text[ptr++] = '\n';
1734 /* We have a data character for the header line. */
1736 next->text[ptr++] = ch; /* Add to buffer */
1737 message_size++; /* Total message size so far */
1739 /* Handle failure due to a humungously long header section. The >= allows
1740 for the terminating \n. Add what we have so far onto the headers list so
1741 that it gets reflected in any error message, and back up the just-read
1744 if (message_size >= header_maxsize)
1746 next->text[ptr] = 0;
1748 next->type = htype_other;
1750 header_last->next = next;
1753 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1754 "%s (more than %d characters): message abandoned",
1755 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1759 smtp_reply = US"552 Message header is ridiculously long";
1760 receive_swallow_smtp();
1761 goto TIDYUP; /* Skip to end of function */
1766 give_local_error(ERRMESS_VLONGHEADER,
1767 string_sprintf("message header longer than %d characters received: "
1768 "message not accepted", header_maxsize), US"", error_rc, stdin,
1770 /* Does not return */
1774 continue; /* With next input character */
1776 /* End of header line reached */
1780 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1782 receive_linecount++;
1783 message_linecount++;
1785 /* Keep track of maximum line length */
1787 if (ptr - prevlines_length > max_received_linelength)
1788 max_received_linelength = ptr - prevlines_length;
1789 prevlines_length = ptr + 1;
1791 /* Now put in the terminating newline. There is always space for
1792 at least two more characters. */
1794 next->text[ptr++] = '\n';
1797 /* A blank line signals the end of the headers; release the unwanted
1798 space and set next to NULL to indicate this. */
1807 /* There is data in the line; see if the next input character is a
1808 whitespace character. If it is, we have a continuation of this header line.
1809 There is always space for at least one character at this point. */
1813 int nextch = (receive_getc)();
1814 if (nextch == ' ' || nextch == '\t')
1816 next->text[ptr++] = nextch;
1818 continue; /* Iterate the loop */
1820 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1821 else ch = EOF; /* Cause main loop to exit at end */
1824 /* We have got to the real line end. Terminate the string and release store
1825 beyond it. If it turns out to be a real header, internal binary zeros will
1826 be squashed later. */
1828 next->text[ptr] = 0;
1830 store_reset(next->text + ptr + 1);
1832 /* Check the running total size against the overall message size limit. We
1833 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1834 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1835 headers - the code to read the body will then also hit the buffer. */
1837 if (message_size > thismessage_size_limit) break;
1839 /* A line that is not syntactically correct for a header also marks
1840 the end of the headers. In this case, we leave next containing the
1841 first data line. This might actually be several lines because of the
1842 continuation logic applied above, but that doesn't matter.
1844 It turns out that smail, and presumably sendmail, accept leading lines
1847 From ph10 Fri Jan 5 12:35 GMT 1996
1849 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1850 find any documentation of this, but for compatibility it had better be
1851 accepted. Exim restricts it to the case of non-smtp messages, and
1852 treats it as an alternative to the -f command line option. Thus it is
1853 ignored except for trusted users or filter testing. Otherwise it is taken
1854 as the sender address, unless -f was used (sendmail compatibility).
1856 It further turns out that some UUCPs generate the From_line in a different
1859 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1861 The regex for matching these things is now capable of recognizing both
1862 formats (including 2- and 4-digit years in the latter). In fact, the regex
1863 is now configurable, as is the expansion string to fish out the sender.
1865 Even further on it has been discovered that some broken clients send
1866 these lines in SMTP messages. There is now an option to ignore them from
1867 specified hosts or networks. Sigh. */
1869 if (header_last == header_list &&
1872 (sender_host_address != NULL &&
1873 verify_check_host(&ignore_fromline_hosts) == OK)
1875 (sender_host_address == NULL && ignore_fromline_local)
1877 regex_match_and_setup(regex_From, next->text, 0, -1))
1879 if (!sender_address_forced)
1881 uschar *uucp_sender = expand_string(uucp_from_sender);
1882 if (uucp_sender == NULL)
1884 log_write(0, LOG_MAIN|LOG_PANIC,
1885 "expansion of \"%s\" failed after matching "
1886 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1890 int start, end, domain;
1892 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1893 &start, &end, &domain, TRUE);
1894 if (newsender != NULL)
1896 if (domain == 0 && newsender[0] != 0)
1897 newsender = rewrite_address_qualify(newsender, FALSE);
1899 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1901 sender_address = newsender;
1903 if (trusted_caller || filter_test != FTEST_NONE)
1905 authenticated_sender = NULL;
1906 originator_name = US"";
1907 sender_local = FALSE;
1910 if (filter_test != FTEST_NONE)
1911 printf("Sender taken from \"From \" line\n");
1918 /* Not a leading "From " line. Check to see if it is a valid header line.
1919 Header names may contain any non-control characters except space and colon,
1924 uschar *p = next->text;
1926 /* If not a valid header line, break from the header reading loop, leaving
1927 next != NULL, indicating that it holds the first line of the body. */
1929 if (isspace(*p)) break;
1930 while (mac_isgraph(*p) && *p != ':') p++;
1931 while (isspace(*p)) p++;
1934 body_zerocount = had_zero;
1938 /* We have a valid header line. If there were any binary zeroes in
1939 the line, stomp on them here. */
1942 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1944 /* It is perfectly legal to have an empty continuation line
1945 at the end of a header, but it is confusing to humans
1946 looking at such messages, since it looks like a blank line.
1947 Reduce confusion by removing redundant white space at the
1948 end. We know that there is at least one printing character
1949 (the ':' tested for above) so there is no danger of running
1952 p = next->text + ptr - 2;
1955 while (*p == ' ' || *p == '\t') p--;
1956 if (*p != '\n') break;
1957 ptr = (p--) - next->text + 1;
1958 message_size -= next->slen - ptr;
1959 next->text[ptr] = 0;
1963 /* Add the header to the chain */
1965 next->type = htype_other;
1967 header_last->next = next;
1970 /* Check the limit for individual line lengths. This comes after adding to
1971 the chain so that the failing line is reflected if a bounce is generated
1972 (for a local message). */
1974 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1976 log_write(0, LOG_MAIN, "overlong message header line received from "
1977 "%s (more than %d characters): message abandoned",
1978 sender_host_unknown? sender_ident : sender_fullhost,
1979 header_line_maxsize);
1983 smtp_reply = US"552 A message header line is too long";
1984 receive_swallow_smtp();
1985 goto TIDYUP; /* Skip to end of function */
1990 give_local_error(ERRMESS_VLONGHDRLINE,
1991 string_sprintf("message header line longer than %d characters "
1992 "received: message not accepted", header_line_maxsize), US"",
1993 error_rc, stdin, header_list->next);
1994 /* Does not return */
1998 /* Note if any resent- fields exist. */
2000 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2002 resents_exist = TRUE;
2003 resent_prefix = US"Resent-";
2007 /* The line has been handled. If we have hit EOF, break out of the loop,
2008 indicating no pending data line. */
2010 if (ch == EOF) { next = NULL; break; }
2012 /* Set up for the next header */
2015 next = store_get(sizeof(header_line));
2016 next->text = store_get(header_size);
2019 prevlines_length = 0;
2020 } /* Continue, starting to read the next header */
2022 /* At this point, we have read all the headers into a data structure in main
2023 store. The first header is still the dummy placeholder for the Received: header
2024 we are going to generate a bit later on. If next != NULL, it contains the first
2025 data line - which terminated the headers before reaching a blank line (not the
2030 debug_printf(">>Headers received:\n");
2031 for (h = header_list->next; h != NULL; h = h->next)
2032 debug_printf("%s", h->text);
2036 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2037 is dropped immediately after valid headers, the next thing we will see is EOF.
2038 We must test for this specially, as further down the reading of the data is
2039 skipped if already at EOF. */
2041 if (smtp_input && (receive_feof)())
2043 smtp_reply = handle_lost_connection(US" (after header)");
2045 goto TIDYUP; /* Skip to end of function */
2048 /* If this is a filter test run and no headers were read, output a warning
2049 in case there is a mistake in the test message. */
2051 if (filter_test != FTEST_NONE && header_list->next == NULL)
2052 printf("Warning: no message headers read\n");
2055 /* Scan the headers to identify them. Some are merely marked for later
2056 processing; some are dealt with here. */
2058 for (h = header_list->next; h != NULL; h = h->next)
2060 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2061 if (is_resent) contains_resent_headers = TRUE;
2063 switch (header_checkname(h, is_resent))
2066 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2070 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2073 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2076 if (!resents_exist || is_resent) date_header_exists = TRUE;
2079 /* Same comments as about Return-Path: below. */
2081 case htype_delivery_date:
2082 if (delivery_date_remove) h->type = htype_old;
2085 /* Same comments as about Return-Path: below. */
2087 case htype_envelope_to:
2088 if (envelope_to_remove) h->type = htype_old;
2091 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2092 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2093 header consists of just the login id of the user who called Exim, rewrite
2094 it with the gecos field first. Apply this rule to Resent-From: if there
2095 are resent- fields. */
2098 h->type = htype_from;
2099 if (!resents_exist || is_resent)
2105 uschar *s = Ustrchr(h->text, ':') + 1;
2106 while (isspace(*s)) s++;
2107 len = h->slen - (s - h->text) - 1;
2108 if (Ustrlen(originator_login) == len &&
2109 strncmpic(s, originator_login, len) == 0)
2111 uschar *name = is_resent? US"Resent-From" : US"From";
2112 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2113 originator_login, qualify_domain_sender);
2114 from_header = header_last;
2115 h->type = htype_old;
2116 DEBUG(D_receive|D_rewrite)
2117 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2123 /* Identify the Message-id: header for generating "in-reply-to" in the
2124 autoreply transport. For incoming logging, save any resent- value. In both
2125 cases, take just the first of any multiples. */
2128 if (msgid_header == NULL && (!resents_exist || is_resent))
2135 /* Flag all Received: headers */
2137 case htype_received:
2138 h->type = htype_received;
2142 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2144 case htype_reply_to:
2145 h->type = htype_reply_to;
2148 /* The Return-path: header is supposed to be added to messages when
2149 they leave the SMTP system. We shouldn't receive messages that already
2150 contain Return-path. However, since Exim generates Return-path: on
2151 local delivery, resent messages may well contain it. We therefore
2152 provide an option (which defaults on) to remove any Return-path: headers
2153 on input. Removal actually means flagging as "old", which prevents the
2154 header being transmitted with the message. */
2156 case htype_return_path:
2157 if (return_path_remove) h->type = htype_old;
2159 /* If we are testing a mail filter file, use the value of the
2160 Return-Path: header to set up the return_path variable, which is not
2161 otherwise set. However, remove any <> that surround the address
2162 because the variable doesn't have these. */
2164 if (filter_test != FTEST_NONE)
2166 uschar *start = h->text + 12;
2167 uschar *end = start + Ustrlen(start);
2168 while (isspace(*start)) start++;
2169 while (end > start && isspace(end[-1])) end--;
2170 if (*start == '<' && end[-1] == '>')
2175 return_path = string_copyn(start, end - start);
2176 printf("Return-path taken from \"Return-path:\" header line\n");
2180 /* If there is a "Sender:" header and the message is locally originated,
2181 and from an untrusted caller and suppress_local_fixups is not set, or if we
2182 are in submission mode for a remote message, mark it "old" so that it will
2183 not be transmitted with the message, unless active_local_sender_retain is
2184 set. (This can only be true if active_local_from_check is false.) If there
2185 are any resent- headers in the message, apply this rule to Resent-Sender:
2186 instead of Sender:. Messages with multiple resent- header sets cannot be
2187 tidily handled. (For this reason, at least one MUA - Pine - turns old
2188 resent- headers into X-resent- headers when resending, leaving just one
2192 h->type = ((!active_local_sender_retain &&
2194 (sender_local && !trusted_caller && !suppress_local_fixups)
2198 (!resents_exist||is_resent))?
2199 htype_old : htype_sender;
2202 /* Remember the Subject: header for logging. There is no Resent-Subject */
2208 /* "To:" gets flagged, and the existence of a recipient header is noted,
2209 whether it's resent- or not. */
2214 to_or_cc_header_exists = TRUE;
2220 /* Extract recipients from the headers if that is required (the -t option).
2221 Note that this is documented as being done *before* any address rewriting takes
2222 place. There are two possibilities:
2224 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2225 recipients already listed are to be REMOVED from the message. Smail 3 works
2226 like this. We need to build a non-recipients tree for that list, because in
2227 subsequent processing this data is held in a tree and that's what the
2228 spool_write_header() function expects. Make sure that non-recipient addresses
2229 are fully qualified and rewritten if necessary.
2231 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2232 those in the command line arguments (and it is rumoured some other MTAs do
2233 this). Therefore, there is an option to make Exim behave this way.
2235 *** Notes on "Resent-" header lines ***
2237 The presence of resent-headers in the message makes -t horribly ambiguous.
2238 Experiments with sendmail showed that it uses recipients for all resent-
2239 headers, totally ignoring the concept of "sets of resent- headers" as described
2240 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2241 with all the addresses in one instance of each header.
2243 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2244 error for -t if there were resent- headers in the message. However, after a
2245 discussion on the mailing list, I've learned that there are MUAs that use
2246 resent- headers with -t, and also that the stuff about sets of resent- headers
2247 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2248 message with -t and resent- header lines makes sure that only *its* resent-
2249 headers are present; previous ones are often renamed as X-resent- for example.
2251 Consequently, Exim has been changed so that, if any resent- header lines are
2252 present, the recipients are taken from all of the appropriate resent- lines,
2253 and not from the ordinary To:, Cc:, etc. */
2258 error_block **bnext = &bad_addresses;
2260 if (extract_addresses_remove_arguments)
2262 while (recipients_count-- > 0)
2264 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2265 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2266 tree_add_nonrecipient(s);
2268 recipients_list = NULL;
2269 recipients_count = recipients_list_max = 0;
2272 /* Now scan the headers */
2274 for (h = header_list->next; h != NULL; h = h->next)
2276 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2277 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2279 uschar *s = Ustrchr(h->text, ':') + 1;
2280 while (isspace(*s)) s++;
2282 parse_allow_group = TRUE; /* Allow address group syntax */
2286 uschar *ss = parse_find_address_end(s, FALSE);
2287 uschar *recipient, *errmess, *p, *pp;
2288 int start, end, domain;
2290 /* Check on maximum */
2292 if (recipients_max > 0 && ++rcount > recipients_max)
2294 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2295 US"message rejected: ", error_rc, stdin, NULL);
2296 /* Does not return */
2299 /* Make a copy of the address, and remove any internal newlines. These
2300 may be present as a result of continuations of the header line. The
2301 white space that follows the newline must not be removed - it is part
2304 pp = recipient = store_get(ss - s + 1);
2305 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2310 BOOL b = allow_utf8_domains;
2311 allow_utf8_domains = TRUE;
2313 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2317 if (string_is_utf8(recipient))
2318 message_smtputf8 = TRUE;
2320 allow_utf8_domains = b;
2324 /* Keep a list of all the bad addresses so we can send a single
2325 error message at the end. However, an empty address is not an error;
2326 just ignore it. This can come from an empty group list like
2328 To: Recipients of list:;
2330 If there are no recipients at all, an error will occur later. */
2332 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2334 int len = Ustrlen(s);
2335 error_block *b = store_get(sizeof(error_block));
2336 while (len > 0 && isspace(s[len-1])) len--;
2338 b->text1 = string_printing(string_copyn(s, len));
2344 /* If the recipient is already in the nonrecipients tree, it must
2345 have appeared on the command line with the option extract_addresses_
2346 remove_arguments set. Do not add it to the recipients, and keep a note
2347 that this has happened, in order to give a better error if there are
2348 no recipients left. */
2350 else if (recipient != NULL)
2352 if (tree_search(tree_nonrecipients, recipient) == NULL)
2353 receive_add_recipient(recipient, -1);
2355 extracted_ignored = TRUE;
2358 /* Move on past this address */
2360 s = ss + (*ss? 1:0);
2361 while (isspace(*s)) s++;
2362 } /* Next address */
2364 parse_allow_group = FALSE; /* Reset group syntax flags */
2365 parse_found_group = FALSE;
2367 /* If this was the bcc: header, mark it "old", which means it
2368 will be kept on the spool, but not transmitted as part of the
2371 if (h->type == htype_bcc) h->type = htype_old;
2372 } /* For appropriate header line */
2373 } /* For each header line */
2377 /* Now build the unique message id. This has changed several times over the
2378 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2379 Retaining all the history in the comment has become too unwieldy - read
2380 previous release sources if you want it.
2382 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2383 The first part is the current time, in seconds. The second part is the current
2384 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2385 can hold a number in the range 0-3843. It used to be a computed sequence
2386 number, but is now the fractional component of the current time in units of
2387 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2388 received, Exim ensures that the timer has ticked at the appropriate level
2389 before proceeding, to avoid duplication if the pid happened to be re-used
2390 within the same time period. It seems likely that most messages will take at
2391 least half a millisecond to be received, so no delay will normally be
2392 necessary. At least for some time...
2394 There is a modification when localhost_number is set. Formerly this was allowed
2395 to be as large as 255. Now it is restricted to the range 0-16, and the final
2396 component of the message id becomes (localhost_number * 200) + fractional time
2397 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2399 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2400 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2401 still allows the tttttt field to hold a large enough number to last for some
2402 more decades, and the final two-digit field can hold numbers up to 1295, which
2403 is enough for milliseconds (instead of 1/2000 of a second).
2405 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2406 pid, so it is probably safe because pids have to be positive. The
2407 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2408 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2410 Note that string_base62() returns its data in a static storage block, so it
2411 must be copied before calling string_base62() again. It always returns exactly
2414 There doesn't seem to be anything in the RFC which requires a message id to
2415 start with a letter, but Smail was changed to ensure this. The external form of
2416 the message id (as supplied by string expansion) therefore starts with an
2417 additional leading 'E'. The spool file names do not include this leading
2418 letter and it is not used internally.
2420 NOTE: If ever the format of message ids is changed, the regular expression for
2421 checking that a string is in this format must be updated in a corresponding
2422 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2423 must also be changed to reflect the correct string length. Then, of course,
2424 other programs that rely on the message id format will need updating too. */
2426 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2427 message_id[6] = '-';
2428 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2430 /* Deal with the case where the host number is set. The value of the number was
2431 checked when it was read, to ensure it isn't too big. The timing granularity is
2432 left in id_resolution so that an appropriate wait can be done after receiving
2433 the message, if necessary (we hope it won't be). */
2435 if (host_number_string != NULL)
2437 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2438 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2439 string_base62((long int)(
2440 host_number * (1000000/id_resolution) +
2441 message_id_tv.tv_usec/id_resolution)) + 4);
2444 /* Host number not set: final field is just the fractional time at an
2445 appropriate resolution. */
2449 id_resolution = (BASE_62 == 62)? 500 : 1000;
2450 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2451 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2454 /* Add the current message id onto the current process info string if
2457 (void)string_format(process_info + process_info_len,
2458 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2460 /* If we are using multiple input directories, set up the one for this message
2461 to be the least significant base-62 digit of the time of arrival. Otherwise
2462 ensure that it is an empty string. */
2464 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2466 /* Now that we have the message-id, if there is no message-id: header, generate
2467 one, but only for local (without suppress_local_fixups) or submission mode
2468 messages. This can be user-configured if required, but we had better flatten
2469 any illegal characters therein. */
2471 if (msgid_header == NULL &&
2472 ((sender_host_address == NULL && !suppress_local_fixups)
2473 || submission_mode))
2476 uschar *id_text = US"";
2477 uschar *id_domain = primary_hostname;
2479 /* Permit only letters, digits, dots, and hyphens in the domain */
2481 if (message_id_domain != NULL)
2483 uschar *new_id_domain = expand_string(message_id_domain);
2484 if (new_id_domain == NULL)
2486 if (!expand_string_forcedfail)
2487 log_write(0, LOG_MAIN|LOG_PANIC,
2488 "expansion of \"%s\" (message_id_header_domain) "
2489 "failed: %s", message_id_domain, expand_string_message);
2491 else if (*new_id_domain != 0)
2493 id_domain = new_id_domain;
2494 for (p = id_domain; *p != 0; p++)
2495 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2499 /* Permit all characters except controls and RFC 2822 specials in the
2500 additional text part. */
2502 if (message_id_text != NULL)
2504 uschar *new_id_text = expand_string(message_id_text);
2505 if (new_id_text == NULL)
2507 if (!expand_string_forcedfail)
2508 log_write(0, LOG_MAIN|LOG_PANIC,
2509 "expansion of \"%s\" (message_id_header_text) "
2510 "failed: %s", message_id_text, expand_string_message);
2512 else if (*new_id_text != 0)
2514 id_text = new_id_text;
2515 for (p = id_text; *p != 0; p++)
2516 if (mac_iscntrl_or_special(*p)) *p = '-';
2520 /* Add the header line
2521 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2522 * appended, to preserve classical expectations of header ordering. */
2524 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2525 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2526 (*id_text == 0)? "" : ".", id_text, id_domain);
2529 /* If we are to log recipients, keep a copy of the raw ones before any possible
2530 rewriting. Must copy the count, because later ACLs and the local_scan()
2531 function may mess with the real recipients. */
2533 if (LOGGING(received_recipients))
2535 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2536 for (i = 0; i < recipients_count; i++)
2537 raw_recipients[i] = string_copy(recipients_list[i].address);
2538 raw_recipients_count = recipients_count;
2541 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2542 recipients will get here only if the conditions were right (allow_unqualified_
2543 recipient is TRUE). */
2545 for (i = 0; i < recipients_count; i++)
2546 recipients_list[i].address =
2547 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2548 global_rewrite_rules, rewrite_existflags);
2550 /* If there is no From: header, generate one for local (without
2551 suppress_local_fixups) or submission_mode messages. If there is no sender
2552 address, but the sender is local or this is a local delivery error, use the
2553 originator login. This shouldn't happen for genuine bounces, but might happen
2554 for autoreplies. The addition of From: must be done *before* checking for the
2555 possible addition of a Sender: header, because untrusted_set_sender allows an
2556 untrusted user to set anything in the envelope (which might then get info
2557 From:) but we still want to ensure a valid Sender: if it is required. */
2559 if (from_header == NULL &&
2560 ((sender_host_address == NULL && !suppress_local_fixups)
2561 || submission_mode))
2563 uschar *oname = US"";
2565 /* Use the originator_name if this is a locally submitted message and the
2566 caller is not trusted. For trusted callers, use it only if -F was used to
2567 force its value or if we have a non-SMTP message for which -f was not used
2568 to set the sender. */
2570 if (sender_host_address == NULL)
2572 if (!trusted_caller || sender_name_forced ||
2573 (!smtp_input && !sender_address_forced))
2574 oname = originator_name;
2577 /* For non-locally submitted messages, the only time we use the originator
2578 name is when it was forced by the /name= option on control=submission. */
2582 if (submission_name != NULL) oname = submission_name;
2585 /* Envelope sender is empty */
2587 if (sender_address[0] == 0)
2589 uschar *fromstart, *fromend;
2591 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2592 oname, (oname[0] == 0)? "" : " <");
2593 fromend = (oname[0] == 0)? US"" : US">";
2595 if (sender_local || local_error_message)
2597 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2598 local_part_quote(originator_login), qualify_domain_sender,
2601 else if (submission_mode && authenticated_id != NULL)
2603 if (submission_domain == NULL)
2605 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2606 local_part_quote(authenticated_id), qualify_domain_sender,
2609 else if (submission_domain[0] == 0) /* empty => whole address set */
2611 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2616 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2617 local_part_quote(authenticated_id), submission_domain,
2620 from_header = header_last; /* To get it checked for Sender: */
2624 /* There is a non-null envelope sender. Build the header using the original
2625 sender address, before any rewriting that might have been done while
2630 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2632 (oname[0] == 0)? "" : " <",
2633 (sender_address_unrewritten == NULL)?
2634 sender_address : sender_address_unrewritten,
2635 (oname[0] == 0)? "" : ">");
2637 from_header = header_last; /* To get it checked for Sender: */
2642 /* If the sender is local (without suppress_local_fixups), or if we are in
2643 submission mode and there is an authenticated_id, check that an existing From:
2644 is correct, and if not, generate a Sender: header, unless disabled. Any
2645 previously-existing Sender: header was removed above. Note that sender_local,
2646 as well as being TRUE if the caller of exim is not trusted, is also true if a
2647 trusted caller did not supply a -f argument for non-smtp input. To allow
2648 trusted callers to forge From: without supplying -f, we have to test explicitly
2649 here. If the From: header contains more than one address, then the call to
2650 parse_extract_address fails, and a Sender: header is inserted, as required. */
2652 if (from_header != NULL &&
2653 (active_local_from_check &&
2654 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2655 (submission_mode && authenticated_id != NULL))
2658 BOOL make_sender = TRUE;
2659 int start, end, domain;
2661 uschar *from_address =
2662 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2663 &start, &end, &domain, FALSE);
2664 uschar *generated_sender_address;
2666 if (submission_mode)
2668 if (submission_domain == NULL)
2670 generated_sender_address = string_sprintf("%s@%s",
2671 local_part_quote(authenticated_id), qualify_domain_sender);
2673 else if (submission_domain[0] == 0) /* empty => full address */
2675 generated_sender_address = string_sprintf("%s",
2680 generated_sender_address = string_sprintf("%s@%s",
2681 local_part_quote(authenticated_id), submission_domain);
2685 generated_sender_address = string_sprintf("%s@%s",
2686 local_part_quote(originator_login), qualify_domain_sender);
2688 /* Remove permitted prefixes and suffixes from the local part of the From:
2689 address before doing the comparison with the generated sender. */
2691 if (from_address != NULL)
2694 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2696 if (at != NULL) *at = 0;
2697 from_address += route_check_prefix(from_address, local_from_prefix);
2698 slen = route_check_suffix(from_address, local_from_suffix);
2701 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2702 from_address += slen;
2704 if (at != NULL) *at = '@';
2706 if (strcmpic(generated_sender_address, from_address) == 0 ||
2707 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2708 make_sender = FALSE;
2711 /* We have to cause the Sender header to be rewritten if there are
2712 appropriate rewriting rules. */
2716 if (submission_mode && submission_name == NULL)
2717 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2718 generated_sender_address);
2720 header_add(htype_sender, "%sSender: %s <%s>\n",
2722 submission_mode? submission_name : originator_name,
2723 generated_sender_address);
2726 /* Ensure that a non-null envelope sender address corresponds to the
2727 submission mode sender address. */
2729 if (submission_mode && sender_address[0] != 0)
2731 if (sender_address_unrewritten == NULL)
2732 sender_address_unrewritten = sender_address;
2733 sender_address = generated_sender_address;
2734 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2735 log_write(L_address_rewrite, LOG_MAIN,
2736 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2737 sender_address_unrewritten, generated_sender_address);
2741 /* If there are any rewriting rules, apply them to the sender address, unless
2742 it has already been rewritten as part of verification for SMTP input. */
2744 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2745 sender_address[0] != 0)
2747 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2748 global_rewrite_rules, rewrite_existflags);
2749 DEBUG(D_receive|D_rewrite)
2750 debug_printf("rewritten sender = %s\n", sender_address);
2754 /* The headers must be run through rewrite_header(), because it ensures that
2755 addresses are fully qualified, as well as applying any rewriting rules that may
2758 Qualification of header addresses in a message from a remote host happens only
2759 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2760 appropriate. For local messages, qualification always happens, unless -bnq is
2761 used to explicitly suppress it. No rewriting is done for an unqualified address
2762 that is left untouched.
2764 We start at the second header, skipping our own Received:. This rewriting is
2765 documented as happening *after* recipient addresses are taken from the headers
2766 by the -t command line option. An added Sender: gets rewritten here. */
2768 for (h = header_list->next; h != NULL; h = h->next)
2770 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2771 rewrite_existflags, TRUE);
2772 if (newh != NULL) h = newh;
2776 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2777 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2778 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2779 exists, this applies to the set of resent- headers rather than the normal set.
2781 The requirement for a recipient header has been removed in RFC 2822. At this
2782 point in the code, earlier versions of Exim added a To: header for locally
2783 submitted messages, and an empty Bcc: header for others. In the light of the
2784 changes in RFC 2822, this was dropped in November 2003. */
2787 /* If there is no date header, generate one if the message originates locally
2788 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2789 submission mode flag is set. Messages without Date: are not valid, but it seems
2790 to be more confusing if Exim adds one to all remotely-originated messages.
2791 As per Message-Id, we prepend if resending, else append.
2794 if (!date_header_exists &&
2795 ((sender_host_address == NULL && !suppress_local_fixups)
2796 || submission_mode))
2797 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2798 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2800 search_tidyup(); /* Free any cached resources */
2802 /* Show the complete set of headers if debugging. Note that the first one (the
2803 new Received:) has not yet been set. */
2807 debug_printf(">>Headers after rewriting and local additions:\n");
2808 for (h = header_list->next; h != NULL; h = h->next)
2809 debug_printf("%c %s", h->type, h->text);
2813 /* The headers are now complete in store. If we are running in filter
2814 testing mode, that is all this function does. Return TRUE if the message
2815 ended with a dot. */
2817 if (filter_test != FTEST_NONE)
2819 process_info[process_info_len] = 0;
2820 return message_ended == END_DOT;
2823 /* Cutthrough delivery:
2824 We have to create the Received header now rather than at the end of reception,
2825 so the timestamp behaviour is a change to the normal case.
2826 XXX Ensure this gets documented XXX.
2827 Having created it, send the headers to the destination. */
2828 if (cutthrough.fd >= 0)
2830 if (received_count > received_headers_max)
2832 cancel_cutthrough_connection("too many headers");
2833 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2834 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2835 "Too many \"Received\" headers",
2837 (sender_fullhost == NULL)? "" : " H=",
2838 (sender_fullhost == NULL)? US"" : sender_fullhost,
2839 (sender_ident == NULL)? "" : " U=",
2840 (sender_ident == NULL)? US"" : sender_ident);
2841 message_id[0] = 0; /* Indicate no message accepted */
2842 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2843 goto TIDYUP; /* Skip to end of function */
2845 received_header_gen();
2846 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2847 (void) cutthrough_headers_send();
2851 /* Open a new spool file for the data portion of the message. We need
2852 to access it both via a file descriptor and a stream. Try to make the
2853 directory if it isn't there. Note re use of sprintf: spool_directory
2854 is checked on input to be < 200 characters long. */
2856 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2858 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2861 if (errno == ENOENT)
2864 sprintf(CS temp, "input/%s", message_subdir);
2865 if (message_subdir[0] == 0) temp[5] = 0;
2866 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2867 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2870 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2871 spool_name, strerror(errno));
2874 /* Make sure the file's group is the Exim gid, and double-check the mode
2875 because the group setting doesn't always get set automatically. */
2877 if (fchown(data_fd, exim_uid, exim_gid))
2878 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2879 "Failed setting ownership on spool file %s: %s",
2880 spool_name, strerror(errno));
2881 (void)fchmod(data_fd, SPOOL_MODE);
2883 /* We now have data file open. Build a stream for it and lock it. We lock only
2884 the first line of the file (containing the message ID) because otherwise there
2885 are problems when Exim is run under Cygwin (I'm told). See comments in
2886 spool_in.c, where the same locking is done. */
2888 data_file = fdopen(data_fd, "w+");
2889 lock_data.l_type = F_WRLCK;
2890 lock_data.l_whence = SEEK_SET;
2891 lock_data.l_start = 0;
2892 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2894 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2895 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2896 errno, strerror(errno));
2898 /* We have an open, locked data file. Write the message id to it to make it
2899 self-identifying. Then read the remainder of the input of this message and
2900 write it to the data file. If the variable next != NULL, it contains the first
2901 data line (which was read as a header but then turned out not to have the right
2902 format); write it (remembering that it might contain binary zeros). The result
2903 of fwrite() isn't inspected; instead we call ferror() below. */
2905 fprintf(data_file, "%s-D\n", message_id);
2908 uschar *s = next->text;
2909 int len = next->slen;
2910 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2911 body_linecount++; /* Assumes only 1 line */
2914 /* Note that we might already be at end of file, or the logical end of file
2915 (indicated by '.'), or might have encountered an error while writing the
2916 message id or "next" line. */
2918 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2922 message_ended = read_message_data_smtp(data_file);
2923 receive_linecount++; /* The terminating "." line */
2925 else message_ended = read_message_data(data_file);
2927 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2928 message_linecount += body_linecount;
2930 /* Handle premature termination of SMTP */
2932 if (smtp_input && message_ended == END_EOF)
2934 Uunlink(spool_name); /* Lose data file when closed */
2935 cancel_cutthrough_connection("sender closed connection");
2936 message_id[0] = 0; /* Indicate no message accepted */
2937 smtp_reply = handle_lost_connection(US"");
2939 goto TIDYUP; /* Skip to end of function */
2942 /* Handle message that is too big. Don't use host_or_ident() in the log
2943 message; we want to see the ident value even for non-remote messages. */
2945 if (message_ended == END_SIZE)
2947 Uunlink(spool_name); /* Lose the data file when closed */
2948 cancel_cutthrough_connection("mail too big");
2949 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2951 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2952 "message too big: read=%d max=%d",
2954 (sender_fullhost == NULL)? "" : " H=",
2955 (sender_fullhost == NULL)? US"" : sender_fullhost,
2956 (sender_ident == NULL)? "" : " U=",
2957 (sender_ident == NULL)? US"" : sender_ident,
2959 thismessage_size_limit);
2963 smtp_reply = US"552 Message size exceeds maximum permitted";
2964 message_id[0] = 0; /* Indicate no message accepted */
2965 goto TIDYUP; /* Skip to end of function */
2969 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2970 give_local_error(ERRMESS_TOOBIG,
2971 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2972 US"message rejected: ", error_rc, data_file, header_list);
2973 /* Does not return */
2978 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2979 example, there may be some expansion in an ACL that uses a timer.) */
2981 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2983 /* The message body has now been read into the data file. Call fflush() to
2984 empty the buffers in C, and then call fsync() to get the data written out onto
2985 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2986 having to do this). If there was an I/O error on either input or output,
2987 attempt to send an error message, and unlink the spool file. For non-SMTP input
2988 we can then give up. Note that for SMTP input we must swallow the remainder of
2989 the input in cases of output errors, since the far end doesn't expect to see
2990 anything until the terminating dot line is sent. */
2992 if (fflush(data_file) == EOF || ferror(data_file) ||
2993 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
2995 uschar *msg_errno = US strerror(errno);
2996 BOOL input_error = (receive_ferror)() != 0;
2997 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2998 input_error? "Input read" : "Spool write",
3000 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3002 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3003 Uunlink(spool_name); /* Lose the data file */
3004 cancel_cutthrough_connection("error writing spoolfile");
3009 smtp_reply = US"451 Error while reading input data";
3012 smtp_reply = US"451 Error while writing spool file";
3013 receive_swallow_smtp();
3015 message_id[0] = 0; /* Indicate no message accepted */
3016 goto TIDYUP; /* Skip to end of function */
3021 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3022 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3024 /* Does not return */
3029 /* No I/O errors were encountered while writing the data file. */
3031 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3034 /* If there were any bad addresses extracted by -t, or there were no recipients
3035 left after -t, send a message to the sender of this message, or write it to
3036 stderr if the error handling option is set that way. Note that there may
3037 legitimately be no recipients for an SMTP message if they have all been removed
3040 We need to rewind the data file in order to read it. In the case of no
3041 recipients or stderr error writing, throw the data file away afterwards, and
3042 exit. (This can't be SMTP, which always ensures there's at least one
3043 syntactically good recipient address.) */
3045 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3049 if (recipients_count == 0) debug_printf("*** No recipients\n");
3050 if (bad_addresses != NULL)
3052 error_block *eblock = bad_addresses;
3053 debug_printf("*** Bad address(es)\n");
3054 while (eblock != NULL)
3056 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3057 eblock = eblock->next;
3062 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3064 /* If configured to send errors to the sender, but this fails, force
3065 a failure error code. We use a special one for no recipients so that it
3066 can be detected by the autoreply transport. Otherwise error_rc is set to
3067 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3068 it is EXIT_SUCCESS. */
3070 if (error_handling == ERRORS_SENDER)
3072 if (!moan_to_sender(
3073 (bad_addresses == NULL)?
3074 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3075 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3076 bad_addresses, header_list, data_file, FALSE))
3077 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3081 if (bad_addresses == NULL)
3083 if (extracted_ignored)
3084 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3086 fprintf(stderr, "exim: no recipients in message\n");
3090 fprintf(stderr, "exim: invalid address%s",
3091 (bad_addresses->next == NULL)? ":" : "es:\n");
3092 while (bad_addresses != NULL)
3094 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3095 bad_addresses->text2);
3096 bad_addresses = bad_addresses->next;
3101 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3103 Uunlink(spool_name);
3104 (void)fclose(data_file);
3105 exim_exit(error_rc);
3109 /* Data file successfully written. Generate text for the Received: header by
3110 expanding the configured string, and adding a timestamp. By leaving this
3111 operation till now, we ensure that the timestamp is the time that message
3112 reception was completed. However, this is deliberately done before calling the
3113 data ACL and local_scan().
3115 This Received: header may therefore be inspected by the data ACL and by code in
3116 the local_scan() function. When they have run, we update the timestamp to be
3117 the final time of reception.
3119 If there is just one recipient, set up its value in the $received_for variable
3120 for use when we generate the Received: header.
3122 Note: the checking for too many Received: headers is handled by the delivery
3124 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3126 if (received_header->text == NULL) /* Non-cutthrough case */
3128 received_header_gen();
3130 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3132 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3133 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3135 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3136 now, before running the DATA ACL. */
3138 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3141 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3142 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3144 /* If an ACL is specified for checking things at this stage of reception of a
3145 message, run it, unless all the recipients were removed by "discard" in earlier
3146 ACLs. That is the only case in which recipients_count can be zero at this
3147 stage. Set deliver_datafile to point to the data file so that $message_body and
3148 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3151 deliver_datafile = data_fd;
3154 enable_dollar_recipients = TRUE;
3156 if (recipients_count == 0)
3158 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3162 /* Handle interactive SMTP messages */
3164 if (smtp_input && !smtp_batched_input)
3167 #ifndef DISABLE_DKIM
3168 if (!dkim_disable_verify)
3170 /* Finish verification, this will log individual signature results to
3172 dkim_exim_verify_finish();
3174 /* Check if we must run the DKIM ACL */
3175 if ((acl_smtp_dkim != NULL) &&
3176 (dkim_verify_signers != NULL) &&
3177 (dkim_verify_signers[0] != '\0'))
3179 uschar *dkim_verify_signers_expanded =
3180 expand_string(dkim_verify_signers);
3181 if (dkim_verify_signers_expanded == NULL)
3183 log_write(0, LOG_MAIN|LOG_PANIC,
3184 "expansion of dkim_verify_signers option failed: %s",
3185 expand_string_message);
3190 const uschar *ptr = dkim_verify_signers_expanded;
3191 uschar *item = NULL;
3192 uschar *seen_items = NULL;
3193 int seen_items_size = 0;
3194 int seen_items_offset = 0;
3195 uschar itembuf[256];
3196 /* Default to OK when no items are present */
3198 while ((item = string_nextinlist(&ptr, &sep,
3202 /* Prevent running ACL for an empty item */
3203 if (!item || (item[0] == '\0')) continue;
3205 /* Only run ACL once for each domain or identity,
3206 no matter how often it appears in the expanded list. */
3209 uschar *seen_item = NULL;
3210 uschar seen_item_buf[256];
3211 const uschar *seen_items_list = seen_items;
3212 BOOL seen_this_item = FALSE;
3214 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3216 sizeof(seen_item_buf))))
3217 if (Ustrcmp(seen_item,item) == 0)
3219 seen_this_item = TRUE;
3226 debug_printf("acl_smtp_dkim: skipping signer %s, "
3227 "already seen\n", item);
3231 seen_items = string_append(seen_items, &seen_items_size,
3232 &seen_items_offset, 1, ":");
3235 seen_items = string_append(seen_items, &seen_items_size,
3236 &seen_items_offset, 1, item);
3237 seen_items[seen_items_offset] = '\0';
3240 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3243 dkim_exim_acl_setup(item);
3244 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3245 &user_msg, &log_msg);
3250 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3251 "skipping remaining items\n", rc, item);
3252 cancel_cutthrough_connection("dkim acl not ok");
3256 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3259 recipients_count = 0;
3260 blackholed_by = US"DKIM ACL";
3261 if (log_msg != NULL)
3262 blackhole_log_msg = string_sprintf(": %s", log_msg);
3266 Uunlink(spool_name);
3267 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3268 smtp_yield = FALSE; /* No more messsages after dropped connection */
3269 smtp_reply = US""; /* Indicate reply already sent */
3270 message_id[0] = 0; /* Indicate no message accepted */
3271 goto TIDYUP; /* Skip to end of function */
3276 #endif /* DISABLE_DKIM */
3278 #ifdef WITH_CONTENT_SCAN
3279 if (recipients_count > 0 &&
3280 acl_smtp_mime != NULL &&
3281 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3283 #endif /* WITH_CONTENT_SCAN */
3285 #ifdef EXPERIMENTAL_DMARC
3286 dmarc_up = dmarc_store_data(from_header);
3287 #endif /* EXPERIMENTAL_DMARC */
3289 #ifndef DISABLE_PRDR
3290 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3294 int all_fail = FAIL;
3296 smtp_printf("353 PRDR content analysis beginning\r\n");
3297 /* Loop through recipients, responses must be in same order received */
3298 for (c = 0; recipients_count > c; c++)
3300 uschar * addr= recipients_list[c].address;
3301 uschar * msg= US"PRDR R=<%s> %s";
3304 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3305 addr, c+1, recipients_count);
3306 rc = acl_check(ACL_WHERE_PRDR, addr,
3307 acl_smtp_data_prdr, &user_msg, &log_msg);
3309 /* If any recipient rejected content, indicate it in final message */
3311 /* If all recipients rejected, indicate in final message */
3316 case OK: case DISCARD: code = US"250"; break;
3317 case DEFER: code = US"450"; break;
3318 default: code = US"550"; break;
3320 if (user_msg != NULL)
3321 smtp_user_msg(code, user_msg);
3326 case OK: case DISCARD:
3327 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3329 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3331 msg = string_sprintf(CS msg, addr, "refusal"); break;
3333 smtp_user_msg(code, msg);
3335 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3336 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3337 else log_write(0, LOG_MAIN, "%s", CS msg);
3339 if (rc != OK) { receive_remove_recipient(addr); c--; }
3341 /* Set up final message, used if data acl gives OK */
3342 smtp_reply = string_sprintf("%s id=%s message %s",
3343 all_fail == FAIL ? US"550" : US"250",
3346 ? US"rejected for all recipients"
3349 : US"accepted for some recipients");
3350 if (recipients_count == 0)
3352 message_id[0] = 0; /* Indicate no message accepted */
3357 prdr_requested = FALSE;
3358 #endif /* !DISABLE_PRDR */
3360 /* Check the recipients count again, as the MIME ACL might have changed
3363 if (acl_smtp_data != NULL && recipients_count > 0)
3365 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3366 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3369 recipients_count = 0;
3370 blackholed_by = US"DATA ACL";
3371 if (log_msg != NULL)
3372 blackhole_log_msg = string_sprintf(": %s", log_msg);
3373 cancel_cutthrough_connection("data acl discard");
3377 Uunlink(spool_name);
3378 cancel_cutthrough_connection("data acl not ok");
3379 #ifdef WITH_CONTENT_SCAN
3382 #ifdef EXPERIMENTAL_DCC
3385 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3386 smtp_yield = FALSE; /* No more messsages after dropped connection */
3387 smtp_reply = US""; /* Indicate reply already sent */
3388 message_id[0] = 0; /* Indicate no message accepted */
3389 goto TIDYUP; /* Skip to end of function */
3394 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3395 we cannot take different actions for permanent and temporary rejections. */
3400 #ifdef WITH_CONTENT_SCAN
3401 if (acl_not_smtp_mime != NULL &&
3402 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3405 #endif /* WITH_CONTENT_SCAN */
3407 if (acl_not_smtp != NULL)
3409 uschar *user_msg, *log_msg;
3410 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3413 recipients_count = 0;
3414 blackholed_by = US"non-SMTP ACL";
3415 if (log_msg != NULL)
3416 blackhole_log_msg = string_sprintf(": %s", log_msg);
3420 Uunlink(spool_name);
3421 #ifdef WITH_CONTENT_SCAN
3424 #ifdef EXPERIMENTAL_DCC
3427 /* The ACL can specify where rejections are to be logged, possibly
3428 nowhere. The default is main and reject logs. */
3430 if (log_reject_target != 0)
3431 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3432 sender_address, log_msg);
3434 if (user_msg == NULL) user_msg = US"local configuration problem";
3435 if (smtp_batched_input)
3437 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3438 /* Does not return */
3442 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3443 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3444 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3446 /* Does not return */
3449 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3453 /* The applicable ACLs have been run */
3455 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3456 if (queue_only_policy) queued_by = US"ACL";
3459 #ifdef WITH_CONTENT_SCAN
3463 #ifdef EXPERIMENTAL_DCC
3468 /* The final check on the message is to run the scan_local() function. The
3469 version supplied with Exim always accepts, but this is a hook for sysadmins to
3470 supply their own checking code. The local_scan() function is run even when all
3471 the recipients have been discarded. */
3473 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3475 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3476 deleted, and the incident gets logged. */
3478 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3479 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3480 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3481 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3483 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3484 local_scan_timeout);
3485 local_scan_data = NULL;
3487 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3488 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3489 rc = local_scan(data_fd, &local_scan_data);
3491 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3493 enable_dollar_recipients = FALSE;
3495 store_pool = POOL_MAIN; /* In case changed */
3496 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3499 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3500 os_non_restarting_signal(SIGFPE, SIG_DFL);
3501 os_non_restarting_signal(SIGILL, SIG_DFL);
3502 os_non_restarting_signal(SIGBUS, SIG_DFL);
3504 /* The length check is paranoia against some runaway code, and also because
3505 (for a success return) lines in the spool file are read into big_buffer. */
3507 if (local_scan_data != NULL)
3509 int len = Ustrlen(local_scan_data);
3510 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3511 local_scan_data = string_copyn(local_scan_data, len);
3514 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3516 if (!deliver_freeze) /* ACL might have already frozen */
3518 deliver_freeze = TRUE;
3519 deliver_frozen_at = time(NULL);
3520 frozen_by = US"local_scan()";
3522 rc = LOCAL_SCAN_ACCEPT;
3524 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3526 if (!queue_only_policy) /* ACL might have already queued */
3528 queue_only_policy = TRUE;
3529 queued_by = US"local_scan()";
3531 rc = LOCAL_SCAN_ACCEPT;
3534 /* Message accepted: remove newlines in local_scan_data because otherwise
3535 the spool file gets corrupted. Ensure that all recipients are qualified. */
3537 if (rc == LOCAL_SCAN_ACCEPT)
3539 if (local_scan_data != NULL)
3542 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3544 for (i = 0; i < recipients_count; i++)
3546 recipient_item *r = recipients_list + i;
3547 r->address = rewrite_address_qualify(r->address, TRUE);
3548 if (r->errors_to != NULL)
3549 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3551 if (recipients_count == 0 && blackholed_by == NULL)
3552 blackholed_by = US"local_scan";
3555 /* Message rejected: newlines permitted in local_scan_data to generate
3556 multiline SMTP responses. */
3560 uschar *istemp = US"";
3566 errmsg = local_scan_data;
3568 Uunlink(spool_name); /* Cancel this message */
3572 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3573 "rejection given", rc);
3576 case LOCAL_SCAN_REJECT_NOLOGHDR:
3577 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3580 case LOCAL_SCAN_REJECT:
3581 smtp_code = US"550";
3582 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3585 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3586 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3589 case LOCAL_SCAN_TEMPREJECT:
3591 smtp_code = US"451";
3592 if (errmsg == NULL) errmsg = US"Temporary local problem";
3593 istemp = US"temporarily ";
3597 s = string_append(s, &size, &sptr, 2, US"F=",
3598 (sender_address[0] == 0)? US"<>" : sender_address);
3599 s = add_host_info_for_log(s, &size, &sptr);
3602 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3603 s, istemp, string_printing(errmsg));
3607 if (!smtp_batched_input)
3609 smtp_respond(smtp_code, 3, TRUE, errmsg);
3610 message_id[0] = 0; /* Indicate no message accepted */
3611 smtp_reply = US""; /* Indicate reply already sent */
3612 goto TIDYUP; /* Skip to end of function */
3616 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3617 /* Does not return */
3622 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3623 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3624 US"message rejected by local scan code: ", error_rc, data_file,
3626 /* Does not return */
3630 /* Reset signal handlers to ignore signals that previously would have caused
3631 the message to be abandoned. */
3633 signal(SIGTERM, SIG_IGN);
3634 signal(SIGINT, SIG_IGN);
3637 /* Ensure the first time flag is set in the newly-received message. */
3639 deliver_firsttime = TRUE;
3641 #ifdef EXPERIMENTAL_BRIGHTMAIL
3643 /* rewind data file */
3644 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3645 bmi_verdicts = bmi_process_message(header_list, data_fd);
3649 /* Update the timstamp in our Received: header to account for any time taken by
3650 an ACL or by local_scan(). The new time is the time that all reception
3651 processing is complete. */
3653 timestamp = expand_string(US"${tod_full}");
3654 tslen = Ustrlen(timestamp);
3656 memcpy(received_header->text + received_header->slen - tslen - 1,
3659 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3663 deliver_freeze = FALSE;
3664 queue_only_policy = FALSE;
3667 /* Keep the data file open until we have written the header file, in order to
3668 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3669 don't write the header file, and we unlink the data file. If writing the header
3670 file fails, we have failed to accept this message. */
3672 if (host_checking || blackholed_by != NULL)
3675 Uunlink(spool_name);
3676 msg_size = 0; /* Compute size for log line */
3677 for (h = header_list; h != NULL; h = h->next)
3678 if (h->type != '*') msg_size += h->slen;
3681 /* Write the -H file */
3685 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3687 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3688 Uunlink(spool_name); /* Lose the data file */
3692 smtp_reply = US"451 Error in writing spool file";
3693 message_id[0] = 0; /* Indicate no message accepted */
3698 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3699 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3701 /* Does not return */
3707 /* The message has now been successfully received. */
3709 receive_messagecount++;
3711 /* In SMTP sessions we may receive several in one connection. After each one,
3712 we wait for the clock to tick at the level of message-id granularity. This is
3713 so that the combination of time+pid is unique, even on systems where the pid
3714 can be re-used within our time interval. We can't shorten the interval without
3715 re-designing the message-id. See comments above where the message id is
3716 created. This is Something For The Future. */
3718 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3719 exim_wait_tick(&message_id_tv, id_resolution);
3721 /* Add data size to written header size. We do not count the initial file name
3722 that is in the file, but we do add one extra for the notional blank line that
3723 precedes the data. This total differs from message_size in that it include the
3724 added Received: header and any other headers that got created locally. */
3727 fstat(data_fd, &statbuf);
3729 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3731 /* Generate a "message received" log entry. We do this by building up a dynamic
3732 string as required. Since we commonly want to add two items at a time, use a
3733 macro to simplify the coding. We log the arrival of a new message while the
3734 file is still locked, just in case the machine is *really* fast, and delivers
3735 it first! Include any message id that is in the message - since the syntax of a
3736 message id is actually an addr-spec, we can use the parse routine to canonicize
3741 s = store_get(size);
3743 s = string_append(s, &size, &sptr, 2, US"<= ",
3744 (sender_address[0] == 0)? US"<>" : sender_address);
3745 if (message_reference != NULL)
3746 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3748 s = add_host_info_for_log(s, &size, &sptr);
3751 if (LOGGING(tls_cipher) && tls_in.cipher)
3752 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3753 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3754 s = string_append(s, &size, &sptr, 2, US" CV=",
3755 tls_in.certificate_verified? "yes":"no");
3756 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3757 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3758 string_printing(tls_in.peerdn), US"\"");
3759 if (LOGGING(tls_sni) && tls_in.sni)
3760 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3761 string_printing(tls_in.sni), US"\"");
3764 if (sender_host_authenticated)
3766 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3767 if (authenticated_id != NULL)
3769 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3770 if (LOGGING(smtp_mailauth) && authenticated_sender != NULL)
3771 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3775 #ifndef DISABLE_PRDR
3777 s = string_append(s, &size, &sptr, 1, US" PRDR");
3780 #ifdef SUPPORT_PROXY
3781 if (proxy_session && LOGGING(proxy))
3782 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3785 sprintf(CS big_buffer, "%d", msg_size);
3786 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3788 /* log 8BITMIME mode announced in MAIL_FROM
3792 if (LOGGING(8bitmime))
3794 sprintf(CS big_buffer, "%d", body_8bitmime);
3795 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3798 /* If an addr-spec in a message-id contains a quoted string, it can contain
3799 any characters except " \ and CR and so in particular it can contain NL!
3800 Therefore, make sure we use a printing-characters only version for the log.
3801 Also, allow for domain literals in the message id. */
3803 if (msgid_header != NULL)
3806 BOOL save_allow_domain_literals = allow_domain_literals;
3807 allow_domain_literals = TRUE;
3808 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3809 &errmsg, &start, &end, &domain, FALSE);
3810 allow_domain_literals = save_allow_domain_literals;
3812 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3815 /* If subject logging is turned on, create suitable printing-character
3816 text. By expanding $h_subject: we make use of the MIME decoding. */
3818 if (LOGGING(subject) && subject_header != NULL)
3821 uschar *p = big_buffer;
3822 uschar *ss = expand_string(US"$h_subject:");
3824 /* Backslash-quote any double quotes or backslashes so as to make a
3825 a C-like string, and turn any non-printers into escape sequences. */
3828 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3830 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3835 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3838 /* Terminate the string: string_cat() and string_append() leave room, but do
3839 not put the zero in. */
3843 /* Create a message log file if message logs are being used and this message is
3844 not blackholed. Write the reception stuff to it. We used to leave message log
3845 creation until the first delivery, but this has proved confusing for some
3848 if (message_logs && blackholed_by == NULL)
3852 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3854 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3856 if (fd < 0 && errno == ENOENT)
3859 sprintf(CS temp, "msglog/%s", message_subdir);
3860 if (message_subdir[0] == 0) temp[6] = 0;
3861 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3862 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3867 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3868 spool_name, strerror(errno));
3873 FILE *message_log = fdopen(fd, "a");
3874 if (message_log == NULL)
3876 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3877 spool_name, strerror(errno));
3882 uschar *now = tod_stamp(tod_log);
3883 fprintf(message_log, "%s Received from %s\n", now, s+3);
3884 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3886 if (queue_only_policy) fprintf(message_log,
3887 "%s no immediate delivery: queued by %s\n", now, queued_by);
3888 (void)fclose(message_log);
3893 /* Everything has now been done for a successful message except logging its
3894 arrival, and outputting an SMTP response. While writing to the log, set a flag
3895 to cause a call to receive_bomb_out() if the log cannot be opened. */
3897 receive_call_bombout = TRUE;
3899 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3900 connection has gone away. This can only be done if there is no unconsumed input
3901 waiting in the local input buffer. We can test for this by calling
3902 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3903 input to be sent following the final dot, so the presence of following input is
3906 If the connection is still present, but there is no unread input for the
3907 socket, the result of a select() call will be zero. If, however, the connection
3908 has gone away, or if there is pending input, the result of select() will be
3909 non-zero. The two cases can be distinguished by trying to read the next input
3910 character. If we succeed, we can unread it so that it remains in the local
3911 buffer for handling later. If not, the connection has been lost.
3913 Of course, since TCP/IP is asynchronous, there is always a chance that the
3914 connection will vanish between the time of this test and the sending of the
3915 response, but the chance of this happening should be small. */
3917 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3918 !receive_smtp_buffered())
3921 fd_set select_check;
3922 FD_ZERO(&select_check);
3923 FD_SET(fileno(smtp_in), &select_check);
3927 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3929 int c = (receive_getc)();
3930 if (c != EOF) (receive_ungetc)(c); else
3932 uschar *msg = US"SMTP connection lost after final dot";
3933 smtp_reply = US""; /* No attempt to send a response */
3934 smtp_yield = FALSE; /* Nothing more on this connection */
3936 /* Re-use the log line workspace */
3939 s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
3940 s = add_host_info_for_log(s, &size, &sptr);
3942 log_write(0, LOG_MAIN, "%s", s);
3944 /* Delete the files for this aborted message. */
3946 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3947 message_subdir, message_id);
3948 Uunlink(spool_name);
3950 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3951 message_subdir, message_id);
3952 Uunlink(spool_name);
3954 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3955 message_subdir, message_id);
3956 Uunlink(spool_name);
3963 /* The connection has not gone away; we really are going to take responsibility
3964 for this message. */
3966 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
3969 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
3970 the sender's dot (below).
3971 If rejected: copy response to sender, wipe the spooled files, log approriately.
3972 If temp-reject: accept to sender, keep the spooled files.
3974 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3976 XXX We do not handle queue-only, freezing, or blackholes.
3978 if(cutthrough.fd >= 0)
3980 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the messsage */
3981 /* Logging was done in finaldot() */
3984 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3985 cutthrough_done = ACCEPTED;
3986 break; /* message_id needed for SMTP accept below */
3988 default: /* Unknown response, or error. Treat as temp-reject. */
3989 case '4': /* Temp-reject. Keep spoolfiles and accept. */
3990 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
3991 break; /* message_id needed for SMTP accept below */
3993 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
3994 smtp_reply= msg; /* Pass on the exact error */
3995 cutthrough_done = PERM_REJ;
4000 #ifndef DISABLE_PRDR
4001 if(!smtp_reply || prdr_requested)
4006 log_write(0, LOG_MAIN |
4007 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4008 (LOGGING(received_sender)? LOG_SENDER : 0),
4011 /* Log any control actions taken by an ACL or local_scan(). */
4013 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4014 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4015 "no immediate delivery: queued by %s", queued_by);
4017 receive_call_bombout = FALSE;
4019 store_reset(s); /* The store for the main log message can be reused */
4021 /* If the message is frozen, and freeze_tell is set, do the telling. */
4023 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4025 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4026 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4027 message_id, frozen_by, sender_address);
4031 /* Either a message has been successfully received and written to the two spool
4032 files, or an error in writing the spool has occurred for an SMTP message, or
4033 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4034 we will have already given up because there's no point in carrying on!) In
4035 either event, we must now close (and thereby unlock) the data file. In the
4036 successful case, this leaves the message on the spool, ready for delivery. In
4037 the error case, the spool file will be deleted. Then tidy up store, interact
4038 with an SMTP call if necessary, and return.
4040 A fflush() was done earlier in the expectation that any write errors on the
4041 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4042 possible for fclose() to fail - but what to do? What has happened to the lock
4047 process_info[process_info_len] = 0; /* Remove message id */
4048 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4050 /* Now reset signal handlers to their defaults */
4052 signal(SIGTERM, SIG_DFL);
4053 signal(SIGINT, SIG_DFL);
4055 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4056 value, which defaults TRUE - meaning there may be more incoming messages from
4057 this connection. For non-SMTP callers (where there is only ever one message),
4058 the default is FALSE. */
4064 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4065 is set to the response that should be sent. When it is NULL, we generate
4066 default responses. After an ACL error or local_scan() error, the response has
4067 already been sent, and smtp_reply is an empty string to indicate this. */
4069 if (!smtp_batched_input)
4071 if (smtp_reply == NULL)
4073 if (fake_response != OK)
4074 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4075 fake_response_text);
4077 /* An OK response is required; use "message" text if present. */
4079 else if (user_msg != NULL)
4081 uschar *code = US"250";
4083 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4084 smtp_respond(code, len, TRUE, user_msg);
4087 /* Default OK response */
4090 smtp_printf("250 OK id=%s\r\n", message_id);
4093 "\n**** SMTP testing: that is not a real message id!\n\n");
4096 /* smtp_reply is set non-empty */
4098 else if (smtp_reply[0] != 0)
4100 if (fake_response != OK && (smtp_reply[0] == '2'))
4101 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4102 fake_response_text);
4104 smtp_printf("%.1024s\r\n", smtp_reply);
4107 switch (cutthrough_done)
4109 case ACCEPTED: log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4110 case PERM_REJ: { /* Delete spool files */
4111 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
4112 message_subdir, message_id);
4113 Uunlink(spool_name);
4114 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
4115 message_subdir, message_id);
4116 Uunlink(spool_name);
4117 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
4118 message_subdir, message_id);
4119 Uunlink(spool_name);
4121 case TMP_REJ: message_id[0] = 0; /* Prevent a delivery from starting */
4124 cutthrough.delivery = FALSE;
4127 /* For batched SMTP, generate an error message on failure, and do
4128 nothing on success. The function moan_smtp_batch() does not return -
4129 it exits from the program with a non-zero return code. */
4131 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
4135 /* If blackholing, we can immediately log this message's sad fate. The data
4136 file has already been unlinked, and the header file was never written to disk.
4137 We must now indicate that nothing was received, to prevent a delivery from
4140 if (blackholed_by != NULL)
4142 const uschar *detail = local_scan_data
4143 ? string_printing(local_scan_data)
4144 : string_sprintf("(%s discarded recipients)", blackholed_by);
4145 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4146 log_write(0, LOG_MAIN, "Completed");
4150 /* Reset headers so that logging of rejects for a subsequent message doesn't
4151 include them. It is also important to set header_last = NULL before exiting
4152 from this function, as this prevents certain rewrites that might happen during
4153 subsequent verifying (of another incoming message) from trying to add headers
4154 when they shouldn't. */
4156 header_list = header_last = NULL;
4158 return yield; /* TRUE if more messages (SMTP only) */
4161 /* End of receive.c */