1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
13 #ifdef EXPERIMENTAL_DCC
17 #ifdef EXPERIMENTAL_DMARC
19 #endif /* EXPERIMENTAL_DMARC */
21 /*************************************************
22 * Local static variables *
23 *************************************************/
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
30 #ifdef HAVE_LOCAL_SCAN
31 jmp_buf local_scan_env; /* error-handling context for local_scan */
32 unsigned had_local_scan_crash;
33 unsigned had_local_scan_timeout;
37 /*************************************************
38 * Non-SMTP character reading functions *
39 *************************************************/
41 /* These are the default functions that are set up in the variables such as
42 receive_getc initially. They just call the standard functions, passing stdin as
43 the file. (When SMTP input is occurring, different functions are used by
44 changing the pointer variables.) */
47 stdin_getc(unsigned lim)
53 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
54 log_write(L_lost_incoming_connection,
55 LOG_MAIN, "timed out while reading local message");
56 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
60 if (filter_test == FTEST_NONE)
62 fprintf(stderr, "\nexim: %s received - message abandoned\n",
63 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
64 log_write(0, LOG_MAIN, "%s received while reading local message",
65 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
67 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
75 return ungetc(c, stdin);
93 /*************************************************
94 * Check that a set sender is allowed *
95 *************************************************/
97 /* This function is called when a local caller sets an explicit sender address.
98 It checks whether this is permitted, which it is for trusted callers.
99 Otherwise, it must match the pattern(s) in untrusted_set_sender.
101 Arguments: the proposed sender address
102 Returns: TRUE for a trusted caller
103 TRUE if the address has been set, untrusted_set_sender has been
104 set, and the address matches something in the list
109 receive_check_set_sender(uschar *newsender)
112 if (f.trusted_caller) return TRUE;
113 if (!newsender || !untrusted_set_sender) return FALSE;
114 qnewsender = Ustrchr(newsender, '@')
115 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
116 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
122 /*************************************************
123 * Read space info for a partition *
124 *************************************************/
126 /* This function is called by receive_check_fs() below, and also by string
127 expansion for variables such as $spool_space. The field names for the statvfs
128 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
129 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
130 have inodes, and they return -1 for the number available.
132 Later: It turns out that some file systems that do not have the concept of
133 inodes return 0 rather than -1. Such systems should also return 0 for the total
134 number of inodes, so we require that to be greater than zero before returning
138 isspool TRUE for spool partition, FALSE for log partition
139 inodeptr address of int to receive inode count; -1 if there isn't one
141 Returns: available on-root space, in kilobytes
142 -1 for log partition if there isn't one
144 All values are -1 if the STATFS functions are not available.
148 receive_statvfs(BOOL isspool, int *inodeptr)
151 struct STATVFS statbuf;
157 /* The spool directory must always exist. */
161 path = spool_directory;
165 /* Need to cut down the log file path to the directory, and to ignore any
166 appearance of "syslog" in it. */
170 int sep = ':'; /* Not variable - outside scripts use */
171 const uschar *p = log_file_path;
174 /* An empty log_file_path means "use the default". This is the same as an
175 empty item in a list. */
177 if (*p == 0) p = US":";
178 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
179 if (Ustrcmp(path, "syslog") != 0)
182 if (path == NULL) /* No log files */
188 /* An empty string means use the default, which is in the spool directory.
189 But don't just use the spool directory, as it is possible that the log
190 subdirectory has been symbolically linked elsewhere. */
194 sprintf(CS buffer, CS"%s/log", CS spool_directory);
200 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
204 /* We now have the path; do the business */
206 memset(&statbuf, 0, sizeof(statbuf));
208 if (STATVFS(CS path, &statbuf) != 0)
209 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
210 { /* Can happen on first run after installation */
216 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
217 "%s directory %s: %s", name, path, strerror(errno));
218 smtp_closedown(US"spool or log directory problem");
219 exim_exit(EXIT_FAILURE, NULL);
222 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
224 /* Disks are getting huge. Take care with computing the size in kilobytes. */
226 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
229 /* Unable to find partition sizes in this environment. */
239 /*************************************************
240 * Check space on spool and log partitions *
241 *************************************************/
243 /* This function is called before accepting a message; if any thresholds are
244 set, it checks them. If a message_size is supplied, it checks that there is
245 enough space for that size plus the threshold - i.e. that the message won't
246 reduce the space to the threshold. Not all OS have statvfs(); for those that
247 don't, this function always returns TRUE. For some OS the old function and
248 struct name statfs is used; that is handled by a macro, defined in exim.h.
251 msg_size the (estimated) size of an incoming message
253 Returns: FALSE if there isn't enough space, or if the information cannot
255 TRUE if no check was done or there is enough space
259 receive_check_fs(int msg_size)
261 int_eximarith_t space;
264 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
266 space = receive_statvfs(TRUE, &inodes);
269 debug_printf("spool directory space = %dK inodes = %d "
270 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
271 space, inodes, check_spool_space, check_spool_inodes, msg_size);
273 if ((space >= 0 && space < check_spool_space) ||
274 (inodes >= 0 && inodes < check_spool_inodes))
276 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
277 "inodes=%d", space, inodes);
282 if (check_log_space > 0 || check_log_inodes > 0)
284 space = receive_statvfs(FALSE, &inodes);
287 debug_printf("log directory space = %dK inodes = %d "
288 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
289 space, inodes, check_log_space, check_log_inodes);
291 if ((space >= 0 && space < check_log_space) ||
292 (inodes >= 0 && inodes < check_log_inodes))
294 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
295 "inodes=%d", space, inodes);
305 /*************************************************
306 * Bomb out while reading a message *
307 *************************************************/
309 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
310 received, or if there is a timeout. A rarer case might be if the log files are
311 screwed up and Exim can't open them to record a message's arrival. Handling
312 that case is done by setting a flag to cause the log functions to call this
313 function if there is an ultimate disaster. That is why it is globally
317 reason text reason to pass to the not-quit ACL
318 msg default SMTP response to give if in an SMTP session
323 receive_bomb_out(uschar *reason, uschar *msg)
325 static BOOL already_bombing_out;
326 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
327 timeouts, if someone has something slow in their quit ACL. Since the only
328 things we should be doing are to close down cleanly ASAP, on the second
329 pass we also close down stuff that might be opened again, before bypassing
330 the ACL call and exiting. */
332 /* If spool_name is set, it contains the name of the data file that is being
333 written. Unlink it before closing so that it cannot be picked up by a delivery
334 process. Ensure that any header file is also removed. */
336 if (spool_name[0] != '\0')
339 spool_name[Ustrlen(spool_name) - 1] = 'H';
341 spool_name[0] = '\0';
344 /* Now close the file if it is open, either as a fd or a stream. */
348 (void)fclose(spool_data_file);
349 spool_data_file = NULL;
351 else if (data_fd >= 0)
353 (void)close(data_fd);
357 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
358 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
361 if (!already_bombing_out)
363 already_bombing_out = TRUE;
366 if (smtp_batched_input)
367 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
368 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
369 smtp_active_hostname, msg);
373 /* Exit from the program (non-BSMTP cases) */
375 exim_exit(EXIT_FAILURE, NULL);
379 /*************************************************
380 * Data read timeout *
381 *************************************************/
383 /* Handler function for timeouts that occur while reading the data that
386 Argument: the signal number
391 data_timeout_handler(int sig)
393 had_data_timeout = sig;
398 #ifdef HAVE_LOCAL_SCAN
399 /*************************************************
400 * local_scan() timeout *
401 *************************************************/
403 /* Handler function for timeouts that occur while running a local_scan()
404 function. Posix recommends against calling longjmp() from a signal-handler,
405 but the GCC manual says you can so we will, and trust that it's better than
406 calling probably non-signal-safe funxtions during logging from within the
407 handler, even with other compilers.
409 See also https://cwe.mitre.org/data/definitions/745.html which also lists
412 This is all because we have no control over what might be written for a
413 local-scan function, so cannot sprinkle had-signal checks after each
414 call-site. At least with the default "do-nothing" function we won't
417 Argument: the signal number
422 local_scan_timeout_handler(int sig)
424 had_local_scan_timeout = sig;
425 siglongjmp(local_scan_env, 1);
430 /*************************************************
431 * local_scan() crashed *
432 *************************************************/
434 /* Handler function for signals that occur while running a local_scan()
437 Argument: the signal number
442 local_scan_crash_handler(int sig)
444 had_local_scan_crash = sig;
445 siglongjmp(local_scan_env, 1);
448 #endif /*HAVE_LOCAL_SCAN*/
451 /*************************************************
452 * SIGTERM or SIGINT received *
453 *************************************************/
455 /* Handler for SIGTERM or SIGINT signals that occur while reading the
456 data that comprises a message.
458 Argument: the signal number
463 data_sigterm_sigint_handler(int sig)
465 had_data_sigint = sig;
470 /*************************************************
471 * Add new recipient to list *
472 *************************************************/
474 /* This function builds a list of recipient addresses in argc/argv
478 recipient the next address to add to recipients_list
479 pno parent number for fixed aliases; -1 otherwise
485 receive_add_recipient(uschar *recipient, int pno)
487 if (recipients_count >= recipients_list_max)
489 recipient_item *oldlist = recipients_list;
490 int oldmax = recipients_list_max;
491 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
492 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
494 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
497 recipients_list[recipients_count].address = recipient;
498 recipients_list[recipients_count].pno = pno;
499 #ifdef EXPERIMENTAL_BRIGHTMAIL
500 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
501 /* reset optin string pointer for next recipient */
502 bmi_current_optin = NULL;
504 recipients_list[recipients_count].orcpt = NULL;
505 recipients_list[recipients_count].dsn_flags = 0;
506 recipients_list[recipients_count++].errors_to = NULL;
512 /*************************************************
513 * Send user response message *
514 *************************************************/
516 /* This function is passed a default response code and a user message. It calls
517 smtp_message_code() to check and possibly modify the response code, and then
518 calls smtp_respond() to transmit the response. I put this into a function
519 just to avoid a lot of repetition.
522 code the response code
523 user_msg the user message
530 smtp_user_msg(uschar *code, uschar *user_msg)
533 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
534 smtp_respond(code, len, TRUE, user_msg);
542 /*************************************************
543 * Remove a recipient from the list *
544 *************************************************/
546 /* This function is provided for local_scan() to use.
549 recipient address to remove
551 Returns: TRUE if it did remove something; FALSE otherwise
555 receive_remove_recipient(uschar *recipient)
558 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
560 for (count = 0; count < recipients_count; count++)
562 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
564 if ((--recipients_count - count) > 0)
565 memmove(recipients_list + count, recipients_list + count + 1,
566 (recipients_count - count)*sizeof(recipient_item));
577 /*************************************************
578 * Read data portion of a non-SMTP message *
579 *************************************************/
581 /* This function is called to read the remainder of a message (following the
582 header) when the input is not from SMTP - we are receiving a local message on
583 a standard input stream. The message is always terminated by EOF, and is also
584 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
585 two cases for maximum efficiency.
587 Ensure that the body ends with a newline. This will naturally be the case when
588 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
589 as "sequences of lines" - this of course strictly applies only to SMTP, but
590 deliveries into BSD-type mailbox files also require it. Exim used to have a
591 flag for doing this at delivery time, but as it was always set for all
592 transports, I decided to simplify things by putting the check here instead.
594 There is at least one MUA (dtmail) that sends CRLF via this interface, and
595 other programs are known to do this as well. Exim used to have a option for
596 dealing with this: in July 2003, after much discussion, the code has been
597 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
599 However, for the case when a dot on a line by itself terminates a message, the
600 only recognized terminating sequences before and after the dot are LF and CRLF.
601 Otherwise, having read EOL . CR, you don't know whether to read another
604 Internally, in messages stored in Exim's spool files, LF is used as the line
605 terminator. Under the new regime, bare CRs will no longer appear in these
609 fout a FILE to which to write the message
611 Returns: One of the END_xxx values indicating why it stopped reading
615 read_message_data(FILE *fout)
619 register int linelength = 0;
621 /* Handle the case when only EOF terminates the message */
625 register int last_ch = '\n';
627 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
629 if (ch == 0) body_zerocount++;
630 if (last_ch == '\r' && ch != '\n')
632 if (linelength > max_received_linelength)
633 max_received_linelength = linelength;
635 if (fputc('\n', fout) == EOF) return END_WERROR;
639 if (ch == '\r') continue;
641 if (fputc(ch, fout) == EOF) return END_WERROR;
644 if (linelength > max_received_linelength)
645 max_received_linelength = linelength;
650 if (++message_size > thismessage_size_limit) return END_SIZE;
655 if (linelength > max_received_linelength)
656 max_received_linelength = linelength;
657 if (fputc('\n', fout) == EOF) return END_WERROR;
665 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
669 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
671 if (ch == 0) body_zerocount++;
674 case 0: /* Normal state (previous char written) */
678 if (linelength > max_received_linelength)
679 max_received_linelength = linelength;
684 { ch_state = 2; continue; }
687 case 1: /* After written "\n" */
688 if (ch == '.') { ch_state = 3; continue; }
689 if (ch == '\r') { ch_state = 2; continue; }
690 if (ch == '\n') { body_linecount++; linelength = -1; }
695 body_linecount++; /* After unwritten "\r" */
696 if (linelength > max_received_linelength)
697 max_received_linelength = linelength;
705 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
706 if (ch == '\r') continue;
712 case 3: /* After "\n." (\n written, dot not) */
713 if (ch == '\n') return END_DOT;
714 if (ch == '\r') { ch_state = 4; continue; }
717 if (fputc('.', fout) == EOF) return END_WERROR;
721 case 4: /* After "\n.\r" (\n written, rest not) */
722 if (ch == '\n') return END_DOT;
725 if (fputs(".\n", fout) == EOF) return END_WERROR;
726 if (ch == '\r') { ch_state = 2; continue; }
732 if (fputc(ch, fout) == EOF) return END_WERROR;
733 if (++message_size > thismessage_size_limit) return END_SIZE;
736 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
737 the message ends with a newline, and we must also write any characters that
738 were saved up while testing for an ending dot. */
742 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
743 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
744 message_size += Ustrlen(ends[ch_state]);
754 /*************************************************
755 * Read data portion of an SMTP message *
756 *************************************************/
758 /* This function is called to read the remainder of an SMTP message (after the
759 headers), or to skip over it when an error has occurred. In this case, the
760 output file is passed as NULL.
762 If any line begins with a dot, that character is skipped. The input should only
763 be successfully terminated by CR LF . CR LF unless it is local (non-network)
764 SMTP, in which case the CRs are optional, but...
766 FUDGE: It seems that sites on the net send out messages with just LF
767 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
768 we make the CRs optional in all cases.
770 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
771 well, so that there are no CRs in spooled messages. However, the message
772 terminating dot is not recognized between two bare CRs.
775 fout a FILE to which to write the message; NULL if skipping
777 Returns: One of the END_xxx values indicating why it stopped reading
781 read_message_data_smtp(FILE *fout)
787 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
789 if (ch == 0) body_zerocount++;
792 case 0: /* After LF or CRLF */
796 continue; /* Don't ever write . after LF */
800 /* Else fall through to handle as normal uschar. */
802 case 1: /* Normal state */
807 if (linelength > max_received_linelength)
808 max_received_linelength = linelength;
818 case 2: /* After (unwritten) CR */
820 if (linelength > max_received_linelength)
821 max_received_linelength = linelength;
830 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
831 cutthrough_data_put_nl();
832 if (ch != '\r') ch_state = 1; else continue;
836 case 3: /* After [CR] LF . */
844 /* The dot was removed at state 3. For a doubled dot, here, reinstate
845 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
846 and to file below. */
850 cutthrough_data_puts(&c, 1);
855 case 4: /* After [CR] LF . CR */
856 if (ch == '\n') return END_DOT;
859 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
860 cutthrough_data_put_nl();
870 /* Add the character to the spool file, unless skipping; then loop for the
877 if (fputc(ch, fout) == EOF) return END_WERROR;
878 if (message_size > thismessage_size_limit) return END_SIZE;
881 cutthrough_data_put_nl();
885 cutthrough_data_puts(&c, 1);
889 /* Fall through here if EOF encountered. This indicates some kind of error,
890 since a correct message is terminated by [CR] LF . [CR] LF. */
898 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
899 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
900 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
901 body_linecount accounting for proper re-expansion for the wire, so use
902 a cut-down version of the state-machine above; we don't need to do leading-dot
903 detection and unstuffing.
906 fout a FILE to which to write the message; NULL if skipping;
907 must be open for both writing and reading.
909 Returns: One of the END_xxx values indicating why it stopped reading
913 read_message_bdat_smtp(FILE *fout)
915 int linelength = 0, ch;
916 enum CH_STATE ch_state = LF_SEEN;
921 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
923 case EOF: return END_EOF;
924 case ERR: return END_PROTOCOL;
926 /* Nothing to get from the sender anymore. We check the last
927 character written to the spool.
929 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
930 If we would be strict, we would refuse such broken messages.
931 But we are liberal, so we fix it. It would be easy just to append
932 the "\n" to the spool.
934 But there are some more things (line counting, message size calculation and such),
935 that would need to be duplicated here. So we simply do some ungetc
940 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
941 if (fgetc(fout) == '\n') return END_DOT;
944 if (linelength == -1) /* \r already seen (see below) */
946 DEBUG(D_receive) debug_printf("Add missing LF\n");
950 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
951 bdat_ungetc('\r'); /* not even \r was seen */
955 case '\0': body_zerocount++; break;
959 case LF_SEEN: /* After LF or CRLF */
961 /* fall through to handle as normal uschar. */
963 case MID_LINE: /* Mid-line state */
968 if (linelength > max_received_linelength)
969 max_received_linelength = linelength;
975 if (fix_nl) bdat_ungetc('\n');
976 continue; /* don't write CR */
980 case CR_SEEN: /* After (unwritten) CR */
982 if (linelength > max_received_linelength)
983 max_received_linelength = linelength;
990 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
991 cutthrough_data_put_nl();
992 if (ch == '\r') continue; /* don't write CR */
998 /* Add the character to the spool file, unless skipping */
1004 if (fputc(ch, fout) == EOF) return END_WERROR;
1005 if (message_size > thismessage_size_limit) return END_SIZE;
1008 cutthrough_data_put_nl();
1012 cutthrough_data_puts(&c, 1);
1019 read_message_bdat_smtp_wire(FILE *fout)
1023 /* Remember that this message uses wireformat. */
1025 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1026 fout ? "writing spoolfile in wire format" : "flushing input");
1027 f.spool_file_wireformat = TRUE;
1031 if (chunking_data_left > 0)
1033 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1034 uschar * buf = bdat_getbuf(&len);
1036 if (!buf) return END_EOF;
1037 message_size += len;
1038 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1040 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1042 case EOF: return END_EOF;
1043 case EOD: return END_DOT;
1044 case ERR: return END_PROTOCOL;
1050 max_received_linelength
1054 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1057 if (message_size > thismessage_size_limit) return END_SIZE;
1065 /*************************************************
1066 * Swallow SMTP message *
1067 *************************************************/
1069 /* This function is called when there has been some kind of error while reading
1070 an SMTP message, and the remaining data may need to be swallowed. It is global
1071 because it is called from smtp_closedown() to shut down an incoming call
1074 Argument: a FILE from which to read the message
1079 receive_swallow_smtp(void)
1081 if (message_ended >= END_NOTENDED)
1082 message_ended = chunking_state <= CHUNKING_OFFERED
1083 ? read_message_data_smtp(NULL)
1084 : read_message_bdat_smtp_wire(NULL);
1089 /*************************************************
1090 * Handle lost SMTP connection *
1091 *************************************************/
1093 /* This function logs connection loss incidents and generates an appropriate
1096 Argument: additional data for the message
1097 Returns: the SMTP response
1101 handle_lost_connection(uschar *s)
1103 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1104 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1105 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1106 return US"421 Lost incoming connection";
1112 /*************************************************
1113 * Handle a non-smtp reception error *
1114 *************************************************/
1116 /* This function is called for various errors during the reception of non-SMTP
1117 messages. It either sends a message to the sender of the problem message, or it
1118 writes to the standard error stream.
1121 errcode code for moan_to_sender(), identifying the error
1122 text1 first message text, passed to moan_to_sender()
1123 text2 second message text, used only for stderrr
1124 error_rc code to pass to exim_exit if no problem
1125 f FILE containing body of message (may be stdin)
1126 hptr pointer to instore headers or NULL
1128 Returns: calls exim_exit(), which does not return
1132 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1133 FILE *f, header_line *hptr)
1135 if (error_handling == ERRORS_SENDER)
1139 eblock.text1 = text1;
1140 eblock.text2 = US"";
1141 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1142 error_rc = EXIT_FAILURE;
1145 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1147 exim_exit(error_rc, US"");
1152 /*************************************************
1153 * Add header lines set up by ACL *
1154 *************************************************/
1156 /* This function is called to add the header lines that were set up by
1157 statements in an ACL to the list of headers in memory. It is done in two stages
1158 like this, because when the ACL for RCPT is running, the other headers have not
1159 yet been received. This function is called twice; once just before running the
1160 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1161 are visible to the DATA ACL.
1163 Originally these header lines were added at the end. Now there is support for
1164 three different places: top, bottom, and after the Received: header(s). There
1165 will always be at least one Received: header, even if it is marked deleted, and
1166 even if something else has been put in front of it.
1169 acl_name text to identify which ACL
1175 add_acl_headers(int where, uschar *acl_name)
1177 header_line *h, *next;
1178 header_line *last_received = NULL;
1182 case ACL_WHERE_DKIM:
1183 case ACL_WHERE_MIME:
1184 case ACL_WHERE_DATA:
1185 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1186 && (acl_removed_headers || acl_added_headers))
1188 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1189 " will not take effect on cutthrough deliveries");
1194 if (acl_removed_headers)
1196 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1198 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1200 const uschar * list = acl_removed_headers;
1201 int sep = ':'; /* This is specified as a colon-separated list */
1205 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1206 if (header_testname(h, s, Ustrlen(s), FALSE))
1208 h->type = htype_old;
1209 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1212 acl_removed_headers = NULL;
1213 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1216 if (!acl_added_headers) return;
1217 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1219 for (h = acl_added_headers; h; h = next)
1226 h->next = header_list;
1228 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1234 last_received = header_list;
1235 while (!header_testname(last_received, US"Received", 8, FALSE))
1236 last_received = last_received->next;
1237 while (last_received->next &&
1238 header_testname(last_received->next, US"Received", 8, FALSE))
1239 last_received = last_received->next;
1241 h->next = last_received->next;
1242 last_received->next = h;
1243 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1247 /* add header before any header which is NOT Received: or Resent- */
1248 last_received = header_list;
1249 while ( last_received->next &&
1250 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1251 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1252 last_received = last_received->next;
1253 /* last_received now points to the last Received: or Resent-* header
1254 in an uninterrupted chain of those header types (seen from the beginning
1255 of all headers. Our current header must follow it. */
1256 h->next = last_received->next;
1257 last_received->next = h;
1258 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1263 header_last->next = h;
1264 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1268 if (!h->next) header_last = h;
1270 /* Check for one of the known header types (From:, To:, etc.) though in
1271 practice most added headers are going to be "other". Lower case
1272 identification letters are never stored with the header; they are used
1273 for existence tests when messages are received. So discard any lower case
1276 h->type = header_checkname(h, FALSE);
1277 if (h->type >= 'a') h->type = htype_other;
1279 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1282 acl_added_headers = NULL;
1283 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1288 /*************************************************
1289 * Add host information for log line *
1290 *************************************************/
1292 /* Called for acceptance and rejecting log lines. This adds information about
1293 the calling host to a string that is being built dynamically.
1296 s the dynamic string
1298 Returns: the extended string
1302 add_host_info_for_log(gstring * g)
1304 if (sender_fullhost)
1306 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1307 g = string_catn(g, US" DS", 3);
1308 g = string_append(g, 2, US" H=", sender_fullhost);
1309 if (LOGGING(incoming_interface) && interface_address != NULL)
1312 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1315 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1317 g = string_catn(g, US" TFO", 4);
1318 f.tcp_in_fastopen_logged = TRUE;
1321 g = string_append(g, 2, US" U=", sender_ident);
1322 if (received_protocol)
1323 g = string_append(g, 2, US" P=", received_protocol);
1324 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1325 g = string_catn(g, US" L-", f.smtp_in_pipelining_used ? 2 : 3);
1331 #ifdef WITH_CONTENT_SCAN
1333 /*************************************************
1334 * Run the MIME ACL on a message *
1335 *************************************************/
1337 /* This code is in a subroutine so that it can be used for both SMTP
1338 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1341 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1342 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1343 smtp_reply_ptr Where SMTP reply is being built
1344 blackholed_by_ptr Where "blackholed by" message is being built
1346 Returns: TRUE to carry on; FALSE to abandon the message
1350 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1351 uschar **blackholed_by_ptr)
1354 uschar * rfc822_file_path = NULL;
1355 unsigned long mbox_size;
1356 header_line *my_headerlist;
1357 uschar *user_msg, *log_msg;
1358 int mime_part_count_buffer = -1;
1359 uschar * mbox_filename;
1362 /* check if it is a MIME message */
1364 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1365 if ( my_headerlist->type != '*' /* skip deleted headers */
1366 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1369 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1373 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1378 /* make sure the eml mbox file is spooled up */
1379 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1380 { /* error while spooling */
1381 log_write(0, LOG_MAIN|LOG_PANIC,
1382 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1383 Uunlink(spool_name);
1385 #ifdef EXPERIMENTAL_DCC
1388 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1389 message_id[0] = 0; /* Indicate no message accepted */
1390 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1391 return FALSE; /* Indicate skip to end of receive function */
1397 mime_part_count = -1;
1398 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1399 (void)fclose(mbox_file);
1401 if (rfc822_file_path)
1403 mime_part_count = mime_part_count_buffer;
1405 if (unlink(CS rfc822_file_path) == -1)
1407 log_write(0, LOG_PANIC,
1408 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1411 rfc822_file_path = NULL;
1414 /* check if we must check any message/rfc822 attachments */
1417 uschar * scandir = string_copyn(mbox_filename,
1418 Ustrrchr(mbox_filename, '/') - mbox_filename);
1419 struct dirent * entry;
1422 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1423 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1425 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1427 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1433 if (rfc822_file_path)
1435 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1437 /* set RFC822 expansion variable */
1439 mime_part_count_buffer = mime_part_count;
1440 goto MIME_ACL_CHECK;
1442 log_write(0, LOG_PANIC,
1443 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1444 unlink(CS rfc822_file_path);
1449 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1452 recipients_count = 0;
1453 *blackholed_by_ptr = US"MIME ACL";
1454 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1458 Uunlink(spool_name);
1459 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1461 #ifdef EXPERIMENTAL_DCC
1466 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1467 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1468 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1470 message_id[0] = 0; /* Indicate no message accepted */
1471 return FALSE; /* Cause skip to end of receive function */
1477 #endif /* WITH_CONTENT_SCAN */
1482 received_header_gen(void)
1486 header_line *received_header= header_list;
1488 timestamp = expand_string(US"${tod_full}");
1489 if (recipients_count == 1) received_for = recipients_list[0].address;
1490 received = expand_string(received_header_text);
1491 received_for = NULL;
1495 if(spool_name[0] != 0)
1496 Uunlink(spool_name); /* Lose the data file */
1497 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1498 "(received_header_text) failed: %s", string_printing(received_header_text),
1499 expand_string_message);
1502 /* The first element on the header chain is reserved for the Received header,
1503 so all we have to do is fill in the text pointer, and set the type. However, if
1504 the result of the expansion is an empty string, we leave the header marked as
1505 "old" so as to refrain from adding a Received header. */
1507 if (received[0] == 0)
1509 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1510 received_header->type = htype_old;
1514 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1515 received_header->type = htype_received;
1518 received_header->slen = Ustrlen(received_header->text);
1520 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1521 received_header->type, received_header->text);
1526 /*************************************************
1528 *************************************************/
1530 /* Receive a message on the given input, and put it into a pair of spool files.
1531 Either a non-null list of recipients, or the extract flag will be true, or
1532 both. The flag sender_local is true for locally generated messages. The flag
1533 submission_mode is true if an ACL has obeyed "control = submission". The flag
1534 suppress_local_fixups is true if an ACL has obeyed "control =
1535 suppress_local_fixups" or -G was passed on the command-line.
1536 The flag smtp_input is true if the message is to be
1537 handled using SMTP conventions about termination and lines starting with dots.
1538 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1540 If a message was successfully read, message_id[0] will be non-zero.
1542 The general actions of this function are:
1544 . Read the headers of the message (if any) into a chain of store
1547 . If there is a "sender:" header and the message is locally originated,
1548 throw it away, unless the caller is trusted, or unless
1549 active_local_sender_retain is set - which can only happen if
1550 active_local_from_check is false.
1552 . If recipients are to be extracted from the message, build the
1553 recipients list from the headers, removing any that were on the
1554 original recipients list (unless extract_addresses_remove_arguments is
1555 false), and at the same time, remove any bcc header that may be present.
1557 . Get the spool file for the data, sort out its unique name, open
1558 and lock it (but don't give it the name yet).
1560 . Generate a "Message-Id" header if the message doesn't have one, for
1561 locally-originated messages.
1563 . Generate a "Received" header.
1565 . Ensure the recipients list is fully qualified and rewritten if necessary.
1567 . If there are any rewriting rules, apply them to the sender address
1568 and also to the headers.
1570 . If there is no from: header, generate one, for locally-generated messages
1571 and messages in "submission mode" only.
1573 . If the sender is local, check that from: is correct, and if not, generate
1574 a Sender: header, unless message comes from a trusted caller, or this
1575 feature is disabled by active_local_from_check being false.
1577 . If there is no "date" header, generate one, for locally-originated
1578 or submission mode messages only.
1580 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1581 dot_ends mode, to the data file. Leave it open, to hold the lock.
1583 . Write the envelope and the headers to a new file.
1585 . Set the name for the header file; close it.
1587 . Set the name for the data file; close it.
1589 Because this function can potentially be called many times in a single
1590 SMTP connection, all store should be got by store_get(), so that it will be
1591 automatically retrieved after the message is accepted.
1593 FUDGE: It seems that sites on the net send out messages with just LF
1594 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1595 we make the CRs optional in all cases.
1597 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1598 new regime is now in place in which bare CRs in header lines are turned into LF
1599 followed by a space, so as not to terminate the header line.
1601 February 2004: A bare LF in a header line in a message whose first line was
1602 terminated by CRLF is treated in the same way as a bare CR.
1605 extract_recip TRUE if recipients are to be extracted from the message's
1608 Returns: TRUE there are more messages to be read (SMTP input)
1609 FALSE there are no more messages to be read (non-SMTP input
1610 or SMTP connection collapsed, or other failure)
1612 When reading a message for filter testing, the returned value indicates
1613 whether the headers (which is all that is read) were terminated by '.' or
1617 receive_msg(BOOL extract_recip)
1622 int process_info_len = Ustrlen(process_info);
1623 int error_rc = error_handling == ERRORS_SENDER
1624 ? errors_sender_rc : EXIT_FAILURE;
1625 int header_size = 256;
1626 int start, end, domain;
1627 int id_resolution = 0;
1629 int prevlines_length = 0;
1633 BOOL contains_resent_headers = FALSE;
1634 BOOL extracted_ignored = FALSE;
1635 BOOL first_line_ended_crlf = TRUE_UNSET;
1636 BOOL smtp_yield = TRUE;
1639 BOOL resents_exist = FALSE;
1640 uschar *resent_prefix = US"";
1641 uschar *blackholed_by = NULL;
1642 uschar *blackhole_log_msg = US"";
1643 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1646 error_block *bad_addresses = NULL;
1648 uschar *frozen_by = NULL;
1649 uschar *queued_by = NULL;
1653 struct stat statbuf;
1655 /* Final message to give to SMTP caller, and messages from ACLs */
1657 uschar *smtp_reply = NULL;
1658 uschar *user_msg, *log_msg;
1660 /* Working header pointers */
1662 header_line *h, *next;
1664 /* Flags for noting the existence of certain headers (only one left) */
1666 BOOL date_header_exists = FALSE;
1668 /* Pointers to receive the addresses of headers whose contents we need. */
1670 header_line *from_header = NULL;
1671 header_line *subject_header = NULL;
1672 header_line *msgid_header = NULL;
1673 header_line *received_header;
1675 #ifdef EXPERIMENTAL_DMARC
1677 #endif /* EXPERIMENTAL_DMARC */
1679 /* Variables for use when building the Received: header. */
1685 /* Release any open files that might have been cached while preparing to
1686 accept the message - e.g. by verifying addresses - because reading a message
1687 might take a fair bit of real time. */
1691 /* Extracting the recipient list from an input file is incompatible with
1692 cutthrough delivery with the no-spool option. It shouldn't be possible
1693 to set up the combination, but just in case kill any ongoing connection. */
1694 if (extract_recip || !smtp_input)
1695 cancel_cutthrough_connection(TRUE, US"not smtp input");
1697 /* Initialize the chain of headers by setting up a place-holder for Received:
1698 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1699 pointing to the end of the chain to make adding headers simple. */
1701 received_header = header_list = header_last = store_get(sizeof(header_line));
1702 header_list->next = NULL;
1703 header_list->type = htype_old;
1704 header_list->text = NULL;
1705 header_list->slen = 0;
1707 /* Control block for the next header to be read. */
1709 next = store_get(sizeof(header_line));
1710 next->text = store_get(header_size);
1712 /* Initialize message id to be null (indicating no message read), and the
1713 header names list to be the normal list. Indicate there is no data file open
1714 yet, initialize the size and warning count, and deal with no size limit. */
1717 spool_data_file = NULL;
1722 received_count = 1; /* For the one we will add */
1724 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1726 /* While reading the message, the following counts are computed. */
1728 message_linecount = body_linecount = body_zerocount =
1729 max_received_linelength = 0;
1731 #ifndef DISABLE_DKIM
1732 /* Call into DKIM to set up the context. In CHUNKING mode
1733 we clear the dot-stuffing flag */
1734 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1735 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1738 #ifdef EXPERIMENTAL_DMARC
1739 /* initialize libopendmarc */
1740 dmarc_up = dmarc_init();
1743 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1744 ids, and fractions of a second are required. See the comments that precede the
1745 message id creation below. */
1747 (void)gettimeofday(&message_id_tv, NULL);
1749 /* For other uses of the received time we can operate with granularity of one
1750 second, and for that we use the global variable received_time. This is for
1751 things like ultimate message timeouts. */
1753 received_time = message_id_tv;
1755 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1756 happen in the smtp_getc() function when it refills its buffer. */
1758 had_data_timeout = 0;
1760 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1762 /* If not SMTP input, timeout happens only if configured, and we just set a
1763 single timeout for the whole message. */
1765 else if (receive_timeout > 0)
1767 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1768 ALARM(receive_timeout);
1771 /* SIGTERM and SIGINT are caught always. */
1773 had_data_sigint = 0;
1774 signal(SIGTERM, data_sigterm_sigint_handler);
1775 signal(SIGINT, data_sigterm_sigint_handler);
1777 /* Header lines in messages are not supposed to be very long, though when
1778 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1779 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1780 storing the header, and extend this as necessary using string_cat().
1782 To cope with total lunacies, impose an upper limit on the length of the header
1783 section of the message, as otherwise the store will fill up. We must also cope
1784 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1785 Folded header lines are joined into one string, leaving the '\n' characters
1786 inside them, so that writing them out reproduces the input.
1788 Loop for each character of each header; the next structure for chaining the
1789 header is set up already, with ptr the offset of the next character in
1794 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1796 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1797 SMTP must have a correct "." terminator. */
1799 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1801 smtp_reply = handle_lost_connection(US" (header)");
1803 goto TIDYUP; /* Skip to end of function */
1806 /* See if we are at the current header's size limit - there must be at least
1807 four bytes left. This allows for the new character plus a zero, plus two for
1808 extra insertions when we are playing games with dots and carriage returns. If
1809 we are at the limit, extend the text buffer. This could have been done
1810 automatically using string_cat() but because this is a tightish loop storing
1811 only one character at a time, we choose to do it inline. Normally
1812 store_extend() will be able to extend the block; only at the end of a big
1813 store block will a copy be needed. To handle the case of very long headers
1814 (and sometimes lunatic messages can have ones that are 100s of K long) we
1815 call store_release() for strings that have been copied - if the string is at
1816 the start of a block (and therefore the only thing in it, because we aren't
1817 doing any other gets), the block gets freed. We can only do this release if
1818 there were no allocations since the once that we want to free. */
1820 if (ptr >= header_size - 4)
1822 int oldsize = header_size;
1823 /* header_size += 256; */
1825 if (!store_extend(next->text, oldsize, header_size))
1826 next->text = store_newblock(next->text, header_size, ptr);
1829 /* Cope with receiving a binary zero. There is dispute about whether
1830 these should be allowed in RFC 822 messages. The middle view is that they
1831 should not be allowed in headers, at least. Exim takes this attitude at
1832 the moment. We can't just stomp on them here, because we don't know that
1833 this line is a header yet. Set a flag to cause scanning later. */
1835 if (ch == 0) had_zero++;
1837 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1838 those from data files use just LF. Treat LF in local SMTP input as a
1839 terminator too. Treat EOF as a line terminator always. */
1841 if (ch == EOF) goto EOL;
1843 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1844 other MTAs accept this. We are therefore forced into this "liberalisation"
1845 too, so we accept LF as a line terminator whatever the source of the message.
1846 However, if the first line of the message ended with a CRLF, we treat a bare
1847 LF specially by inserting a white space after it to ensure that the header
1848 line is not terminated. */
1852 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1853 else if (first_line_ended_crlf) receive_ungetc(' ');
1857 /* This is not the end of the line. If this is SMTP input and this is
1858 the first character in the line and it is a "." character, ignore it.
1859 This implements the dot-doubling rule, though header lines starting with
1860 dots aren't exactly common. They are legal in RFC 822, though. If the
1861 following is CRLF or LF, this is the line that that terminates the
1862 entire message. We set message_ended to indicate this has happened (to
1863 prevent further reading), and break out of the loop, having freed the
1864 empty header, and set next = NULL to indicate no data line. */
1866 if (ptr == 0 && ch == '.' && f.dot_ends)
1868 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1871 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1875 ch = '\r'; /* Revert to CR */
1880 message_ended = END_DOT;
1883 break; /* End character-reading loop */
1886 /* For non-SMTP input, the dot at the start of the line was really a data
1887 character. What is now in ch is the following character. We guaranteed
1888 enough space for this above. */
1892 next->text[ptr++] = '.';
1897 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1898 remember this case if this is the first line ending. */
1902 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1905 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1909 /* Otherwise, put back the character after CR, and turn the bare CR
1912 ch = (receive_ungetc)(ch);
1913 next->text[ptr++] = '\n';
1918 /* We have a data character for the header line. */
1920 next->text[ptr++] = ch; /* Add to buffer */
1921 message_size++; /* Total message size so far */
1923 /* Handle failure due to a humungously long header section. The >= allows
1924 for the terminating \n. Add what we have so far onto the headers list so
1925 that it gets reflected in any error message, and back up the just-read
1928 if (message_size >= header_maxsize)
1930 next->text[ptr] = 0;
1932 next->type = htype_other;
1934 header_last->next = next;
1937 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1938 "%s (more than %d characters): message abandoned",
1939 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1943 smtp_reply = US"552 Message header is ridiculously long";
1944 receive_swallow_smtp();
1945 goto TIDYUP; /* Skip to end of function */
1950 give_local_error(ERRMESS_VLONGHEADER,
1951 string_sprintf("message header longer than %d characters received: "
1952 "message not accepted", header_maxsize), US"", error_rc, stdin,
1954 /* Does not return */
1958 continue; /* With next input character */
1960 /* End of header line reached */
1964 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1966 receive_linecount++;
1967 message_linecount++;
1969 /* Keep track of maximum line length */
1971 if (ptr - prevlines_length > max_received_linelength)
1972 max_received_linelength = ptr - prevlines_length;
1973 prevlines_length = ptr + 1;
1975 /* Now put in the terminating newline. There is always space for
1976 at least two more characters. */
1978 next->text[ptr++] = '\n';
1981 /* A blank line signals the end of the headers; release the unwanted
1982 space and set next to NULL to indicate this. */
1991 /* There is data in the line; see if the next input character is a
1992 whitespace character. If it is, we have a continuation of this header line.
1993 There is always space for at least one character at this point. */
1997 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1998 if (nextch == ' ' || nextch == '\t')
2000 next->text[ptr++] = nextch;
2002 continue; /* Iterate the loop */
2004 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2005 else ch = EOF; /* Cause main loop to exit at end */
2008 /* We have got to the real line end. Terminate the string and release store
2009 beyond it. If it turns out to be a real header, internal binary zeros will
2010 be squashed later. */
2012 next->text[ptr] = 0;
2014 store_reset(next->text + ptr + 1);
2016 /* Check the running total size against the overall message size limit. We
2017 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2018 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2019 headers - the code to read the body will then also hit the buffer. */
2021 if (message_size > thismessage_size_limit) break;
2023 /* A line that is not syntactically correct for a header also marks
2024 the end of the headers. In this case, we leave next containing the
2025 first data line. This might actually be several lines because of the
2026 continuation logic applied above, but that doesn't matter.
2028 It turns out that smail, and presumably sendmail, accept leading lines
2031 From ph10 Fri Jan 5 12:35 GMT 1996
2033 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2034 find any documentation of this, but for compatibility it had better be
2035 accepted. Exim restricts it to the case of non-smtp messages, and
2036 treats it as an alternative to the -f command line option. Thus it is
2037 ignored except for trusted users or filter testing. Otherwise it is taken
2038 as the sender address, unless -f was used (sendmail compatibility).
2040 It further turns out that some UUCPs generate the From_line in a different
2043 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2045 The regex for matching these things is now capable of recognizing both
2046 formats (including 2- and 4-digit years in the latter). In fact, the regex
2047 is now configurable, as is the expansion string to fish out the sender.
2049 Even further on it has been discovered that some broken clients send
2050 these lines in SMTP messages. There is now an option to ignore them from
2051 specified hosts or networks. Sigh. */
2053 if ( header_last == header_list
2055 || ( sender_host_address
2056 && verify_check_host(&ignore_fromline_hosts) == OK
2058 || (!sender_host_address && ignore_fromline_local)
2060 && regex_match_and_setup(regex_From, next->text, 0, -1)
2063 if (!f.sender_address_forced)
2065 uschar *uucp_sender = expand_string(uucp_from_sender);
2067 log_write(0, LOG_MAIN|LOG_PANIC,
2068 "expansion of \"%s\" failed after matching "
2069 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2072 int start, end, domain;
2074 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2075 &start, &end, &domain, TRUE);
2078 if (domain == 0 && newsender[0] != 0)
2079 newsender = rewrite_address_qualify(newsender, FALSE);
2081 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2083 sender_address = newsender;
2085 if (f.trusted_caller || filter_test != FTEST_NONE)
2087 authenticated_sender = NULL;
2088 originator_name = US"";
2089 f.sender_local = FALSE;
2092 if (filter_test != FTEST_NONE)
2093 printf("Sender taken from \"From \" line\n");
2100 /* Not a leading "From " line. Check to see if it is a valid header line.
2101 Header names may contain any non-control characters except space and colon,
2106 uschar *p = next->text;
2108 /* If not a valid header line, break from the header reading loop, leaving
2109 next != NULL, indicating that it holds the first line of the body. */
2111 if (isspace(*p)) break;
2112 while (mac_isgraph(*p) && *p != ':') p++;
2113 while (isspace(*p)) p++;
2116 body_zerocount = had_zero;
2120 /* We have a valid header line. If there were any binary zeroes in
2121 the line, stomp on them here. */
2124 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2126 /* It is perfectly legal to have an empty continuation line
2127 at the end of a header, but it is confusing to humans
2128 looking at such messages, since it looks like a blank line.
2129 Reduce confusion by removing redundant white space at the
2130 end. We know that there is at least one printing character
2131 (the ':' tested for above) so there is no danger of running
2134 p = next->text + ptr - 2;
2137 while (*p == ' ' || *p == '\t') p--;
2138 if (*p != '\n') break;
2139 ptr = (p--) - next->text + 1;
2140 message_size -= next->slen - ptr;
2141 next->text[ptr] = 0;
2145 /* Add the header to the chain */
2147 next->type = htype_other;
2149 header_last->next = next;
2152 /* Check the limit for individual line lengths. This comes after adding to
2153 the chain so that the failing line is reflected if a bounce is generated
2154 (for a local message). */
2156 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2158 log_write(0, LOG_MAIN, "overlong message header line received from "
2159 "%s (more than %d characters): message abandoned",
2160 f.sender_host_unknown ? sender_ident : sender_fullhost,
2161 header_line_maxsize);
2165 smtp_reply = US"552 A message header line is too long";
2166 receive_swallow_smtp();
2167 goto TIDYUP; /* Skip to end of function */
2171 give_local_error(ERRMESS_VLONGHDRLINE,
2172 string_sprintf("message header line longer than %d characters "
2173 "received: message not accepted", header_line_maxsize), US"",
2174 error_rc, stdin, header_list->next);
2175 /* Does not return */
2178 /* Note if any resent- fields exist. */
2180 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2182 resents_exist = TRUE;
2183 resent_prefix = US"Resent-";
2187 /* Reject CHUNKING messages that do not CRLF their first header line */
2189 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2191 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2192 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2194 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2195 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2196 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2199 goto TIDYUP; /* Skip to end of function */
2202 /* The line has been handled. If we have hit EOF, break out of the loop,
2203 indicating no pending data line. */
2205 if (ch == EOF) { next = NULL; break; }
2207 /* Set up for the next header */
2210 next = store_get(sizeof(header_line));
2211 next->text = store_get(header_size);
2214 prevlines_length = 0;
2215 } /* Continue, starting to read the next header */
2217 /* At this point, we have read all the headers into a data structure in main
2218 store. The first header is still the dummy placeholder for the Received: header
2219 we are going to generate a bit later on. If next != NULL, it contains the first
2220 data line - which terminated the headers before reaching a blank line (not the
2225 debug_printf(">>Headers received:\n");
2226 for (h = header_list->next; h; h = h->next)
2227 debug_printf("%s", h->text);
2231 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2232 is dropped immediately after valid headers, the next thing we will see is EOF.
2233 We must test for this specially, as further down the reading of the data is
2234 skipped if already at EOF. */
2236 if (smtp_input && (receive_feof)())
2238 smtp_reply = handle_lost_connection(US" (after header)");
2240 goto TIDYUP; /* Skip to end of function */
2243 /* If this is a filter test run and no headers were read, output a warning
2244 in case there is a mistake in the test message. */
2246 if (filter_test != FTEST_NONE && header_list->next == NULL)
2247 printf("Warning: no message headers read\n");
2250 /* Scan the headers to identify them. Some are merely marked for later
2251 processing; some are dealt with here. */
2253 for (h = header_list->next; h; h = h->next)
2255 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2256 if (is_resent) contains_resent_headers = TRUE;
2258 switch (header_checkname(h, is_resent))
2261 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2265 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2268 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2271 if (!resents_exist || is_resent) date_header_exists = TRUE;
2274 /* Same comments as about Return-Path: below. */
2276 case htype_delivery_date:
2277 if (delivery_date_remove) h->type = htype_old;
2280 /* Same comments as about Return-Path: below. */
2282 case htype_envelope_to:
2283 if (envelope_to_remove) h->type = htype_old;
2286 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2287 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2288 header consists of just the login id of the user who called Exim, rewrite
2289 it with the gecos field first. Apply this rule to Resent-From: if there
2290 are resent- fields. */
2293 h->type = htype_from;
2294 if (!resents_exist || is_resent)
2300 uschar *s = Ustrchr(h->text, ':') + 1;
2301 while (isspace(*s)) s++;
2302 len = h->slen - (s - h->text) - 1;
2303 if (Ustrlen(originator_login) == len &&
2304 strncmpic(s, originator_login, len) == 0)
2306 uschar *name = is_resent? US"Resent-From" : US"From";
2307 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2308 originator_login, qualify_domain_sender);
2309 from_header = header_last;
2310 h->type = htype_old;
2311 DEBUG(D_receive|D_rewrite)
2312 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2318 /* Identify the Message-id: header for generating "in-reply-to" in the
2319 autoreply transport. For incoming logging, save any resent- value. In both
2320 cases, take just the first of any multiples. */
2323 if (!msgid_header && (!resents_exist || is_resent))
2330 /* Flag all Received: headers */
2332 case htype_received:
2333 h->type = htype_received;
2337 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2339 case htype_reply_to:
2340 h->type = htype_reply_to;
2343 /* The Return-path: header is supposed to be added to messages when
2344 they leave the SMTP system. We shouldn't receive messages that already
2345 contain Return-path. However, since Exim generates Return-path: on
2346 local delivery, resent messages may well contain it. We therefore
2347 provide an option (which defaults on) to remove any Return-path: headers
2348 on input. Removal actually means flagging as "old", which prevents the
2349 header being transmitted with the message. */
2351 case htype_return_path:
2352 if (return_path_remove) h->type = htype_old;
2354 /* If we are testing a mail filter file, use the value of the
2355 Return-Path: header to set up the return_path variable, which is not
2356 otherwise set. However, remove any <> that surround the address
2357 because the variable doesn't have these. */
2359 if (filter_test != FTEST_NONE)
2361 uschar *start = h->text + 12;
2362 uschar *end = start + Ustrlen(start);
2363 while (isspace(*start)) start++;
2364 while (end > start && isspace(end[-1])) end--;
2365 if (*start == '<' && end[-1] == '>')
2370 return_path = string_copyn(start, end - start);
2371 printf("Return-path taken from \"Return-path:\" header line\n");
2375 /* If there is a "Sender:" header and the message is locally originated,
2376 and from an untrusted caller and suppress_local_fixups is not set, or if we
2377 are in submission mode for a remote message, mark it "old" so that it will
2378 not be transmitted with the message, unless active_local_sender_retain is
2379 set. (This can only be true if active_local_from_check is false.) If there
2380 are any resent- headers in the message, apply this rule to Resent-Sender:
2381 instead of Sender:. Messages with multiple resent- header sets cannot be
2382 tidily handled. (For this reason, at least one MUA - Pine - turns old
2383 resent- headers into X-resent- headers when resending, leaving just one
2387 h->type = !f.active_local_sender_retain
2388 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2389 || f.submission_mode
2391 && (!resents_exist || is_resent)
2392 ? htype_old : htype_sender;
2395 /* Remember the Subject: header for logging. There is no Resent-Subject */
2401 /* "To:" gets flagged, and the existence of a recipient header is noted,
2402 whether it's resent- or not. */
2407 to_or_cc_header_exists = TRUE;
2413 /* Extract recipients from the headers if that is required (the -t option).
2414 Note that this is documented as being done *before* any address rewriting takes
2415 place. There are two possibilities:
2417 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2418 recipients already listed are to be REMOVED from the message. Smail 3 works
2419 like this. We need to build a non-recipients tree for that list, because in
2420 subsequent processing this data is held in a tree and that's what the
2421 spool_write_header() function expects. Make sure that non-recipient addresses
2422 are fully qualified and rewritten if necessary.
2424 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2425 those in the command line arguments (and it is rumoured some other MTAs do
2426 this). Therefore, there is an option to make Exim behave this way.
2428 *** Notes on "Resent-" header lines ***
2430 The presence of resent-headers in the message makes -t horribly ambiguous.
2431 Experiments with sendmail showed that it uses recipients for all resent-
2432 headers, totally ignoring the concept of "sets of resent- headers" as described
2433 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2434 with all the addresses in one instance of each header.
2436 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2437 error for -t if there were resent- headers in the message. However, after a
2438 discussion on the mailing list, I've learned that there are MUAs that use
2439 resent- headers with -t, and also that the stuff about sets of resent- headers
2440 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2441 message with -t and resent- header lines makes sure that only *its* resent-
2442 headers are present; previous ones are often renamed as X-resent- for example.
2444 Consequently, Exim has been changed so that, if any resent- header lines are
2445 present, the recipients are taken from all of the appropriate resent- lines,
2446 and not from the ordinary To:, Cc:, etc. */
2451 error_block **bnext = &bad_addresses;
2453 if (extract_addresses_remove_arguments)
2455 while (recipients_count-- > 0)
2457 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2458 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2459 tree_add_nonrecipient(s);
2461 recipients_list = NULL;
2462 recipients_count = recipients_list_max = 0;
2465 /* Now scan the headers */
2467 for (h = header_list->next; h; h = h->next)
2469 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2470 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2472 uschar *s = Ustrchr(h->text, ':') + 1;
2473 while (isspace(*s)) s++;
2475 f.parse_allow_group = TRUE; /* Allow address group syntax */
2479 uschar *ss = parse_find_address_end(s, FALSE);
2480 uschar *recipient, *errmess, *p, *pp;
2481 int start, end, domain;
2483 /* Check on maximum */
2485 if (recipients_max > 0 && ++rcount > recipients_max)
2486 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2487 US"message rejected: ", error_rc, stdin, NULL);
2488 /* Does not return */
2490 /* Make a copy of the address, and remove any internal newlines. These
2491 may be present as a result of continuations of the header line. The
2492 white space that follows the newline must not be removed - it is part
2495 pp = recipient = store_get(ss - s + 1);
2496 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2501 BOOL b = allow_utf8_domains;
2502 allow_utf8_domains = TRUE;
2504 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2508 if (string_is_utf8(recipient))
2509 message_smtputf8 = TRUE;
2511 allow_utf8_domains = b;
2515 /* Keep a list of all the bad addresses so we can send a single
2516 error message at the end. However, an empty address is not an error;
2517 just ignore it. This can come from an empty group list like
2519 To: Recipients of list:;
2521 If there are no recipients at all, an error will occur later. */
2523 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2525 int len = Ustrlen(s);
2526 error_block *b = store_get(sizeof(error_block));
2527 while (len > 0 && isspace(s[len-1])) len--;
2529 b->text1 = string_printing(string_copyn(s, len));
2535 /* If the recipient is already in the nonrecipients tree, it must
2536 have appeared on the command line with the option extract_addresses_
2537 remove_arguments set. Do not add it to the recipients, and keep a note
2538 that this has happened, in order to give a better error if there are
2539 no recipients left. */
2541 else if (recipient != NULL)
2543 if (tree_search(tree_nonrecipients, recipient) == NULL)
2544 receive_add_recipient(recipient, -1);
2546 extracted_ignored = TRUE;
2549 /* Move on past this address */
2551 s = ss + (*ss? 1:0);
2552 while (isspace(*s)) s++;
2553 } /* Next address */
2555 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2556 f.parse_found_group = FALSE;
2558 /* If this was the bcc: header, mark it "old", which means it
2559 will be kept on the spool, but not transmitted as part of the
2562 if (h->type == htype_bcc) h->type = htype_old;
2563 } /* For appropriate header line */
2564 } /* For each header line */
2568 /* Now build the unique message id. This has changed several times over the
2569 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2570 Retaining all the history in the comment has become too unwieldy - read
2571 previous release sources if you want it.
2573 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2574 The first part is the current time, in seconds. The second part is the current
2575 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2576 can hold a number in the range 0-3843. It used to be a computed sequence
2577 number, but is now the fractional component of the current time in units of
2578 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2579 received, Exim ensures that the timer has ticked at the appropriate level
2580 before proceeding, to avoid duplication if the pid happened to be re-used
2581 within the same time period. It seems likely that most messages will take at
2582 least half a millisecond to be received, so no delay will normally be
2583 necessary. At least for some time...
2585 There is a modification when localhost_number is set. Formerly this was allowed
2586 to be as large as 255. Now it is restricted to the range 0-16, and the final
2587 component of the message id becomes (localhost_number * 200) + fractional time
2588 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2590 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2591 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2592 still allows the tttttt field to hold a large enough number to last for some
2593 more decades, and the final two-digit field can hold numbers up to 1295, which
2594 is enough for milliseconds (instead of 1/2000 of a second).
2596 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2597 pid, so it is probably safe because pids have to be positive. The
2598 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2599 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2601 Note that string_base62() returns its data in a static storage block, so it
2602 must be copied before calling string_base62() again. It always returns exactly
2605 There doesn't seem to be anything in the RFC which requires a message id to
2606 start with a letter, but Smail was changed to ensure this. The external form of
2607 the message id (as supplied by string expansion) therefore starts with an
2608 additional leading 'E'. The spool file names do not include this leading
2609 letter and it is not used internally.
2611 NOTE: If ever the format of message ids is changed, the regular expression for
2612 checking that a string is in this format must be updated in a corresponding
2613 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2614 must also be changed to reflect the correct string length. The queue-sort code
2615 needs to know the layout. Then, of course, other programs that rely on the
2616 message id format will need updating too. */
2618 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2619 message_id[6] = '-';
2620 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2622 /* Deal with the case where the host number is set. The value of the number was
2623 checked when it was read, to ensure it isn't too big. The timing granularity is
2624 left in id_resolution so that an appropriate wait can be done after receiving
2625 the message, if necessary (we hope it won't be). */
2627 if (host_number_string)
2629 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2630 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2631 string_base62((long int)(
2632 host_number * (1000000/id_resolution) +
2633 message_id_tv.tv_usec/id_resolution)) + 4);
2636 /* Host number not set: final field is just the fractional time at an
2637 appropriate resolution. */
2641 id_resolution = BASE_62 == 62 ? 500 : 1000;
2642 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2643 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2646 /* Add the current message id onto the current process info string if
2649 (void)string_format(process_info + process_info_len,
2650 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2652 /* If we are using multiple input directories, set up the one for this message
2653 to be the least significant base-62 digit of the time of arrival. Otherwise
2654 ensure that it is an empty string. */
2656 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2658 /* Now that we have the message-id, if there is no message-id: header, generate
2659 one, but only for local (without suppress_local_fixups) or submission mode
2660 messages. This can be user-configured if required, but we had better flatten
2661 any illegal characters therein. */
2664 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2667 uschar *id_text = US"";
2668 uschar *id_domain = primary_hostname;
2670 /* Permit only letters, digits, dots, and hyphens in the domain */
2672 if (message_id_domain)
2674 uschar *new_id_domain = expand_string(message_id_domain);
2677 if (!f.expand_string_forcedfail)
2678 log_write(0, LOG_MAIN|LOG_PANIC,
2679 "expansion of \"%s\" (message_id_header_domain) "
2680 "failed: %s", message_id_domain, expand_string_message);
2682 else if (*new_id_domain)
2684 id_domain = new_id_domain;
2685 for (p = id_domain; *p; p++)
2686 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2690 /* Permit all characters except controls and RFC 2822 specials in the
2691 additional text part. */
2693 if (message_id_text)
2695 uschar *new_id_text = expand_string(message_id_text);
2698 if (!f.expand_string_forcedfail)
2699 log_write(0, LOG_MAIN|LOG_PANIC,
2700 "expansion of \"%s\" (message_id_header_text) "
2701 "failed: %s", message_id_text, expand_string_message);
2703 else if (*new_id_text)
2705 id_text = new_id_text;
2706 for (p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2710 /* Add the header line
2711 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2712 * appended, to preserve classical expectations of header ordering. */
2714 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2715 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2716 (*id_text == 0)? "" : ".", id_text, id_domain);
2719 /* If we are to log recipients, keep a copy of the raw ones before any possible
2720 rewriting. Must copy the count, because later ACLs and the local_scan()
2721 function may mess with the real recipients. */
2723 if (LOGGING(received_recipients))
2725 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2726 for (i = 0; i < recipients_count; i++)
2727 raw_recipients[i] = string_copy(recipients_list[i].address);
2728 raw_recipients_count = recipients_count;
2731 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2732 recipients will get here only if the conditions were right (allow_unqualified_
2733 recipient is TRUE). */
2735 for (i = 0; i < recipients_count; i++)
2736 recipients_list[i].address =
2737 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2738 global_rewrite_rules, rewrite_existflags);
2740 /* If there is no From: header, generate one for local (without
2741 suppress_local_fixups) or submission_mode messages. If there is no sender
2742 address, but the sender is local or this is a local delivery error, use the
2743 originator login. This shouldn't happen for genuine bounces, but might happen
2744 for autoreplies. The addition of From: must be done *before* checking for the
2745 possible addition of a Sender: header, because untrusted_set_sender allows an
2746 untrusted user to set anything in the envelope (which might then get info
2747 From:) but we still want to ensure a valid Sender: if it is required. */
2750 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2752 uschar *oname = US"";
2754 /* Use the originator_name if this is a locally submitted message and the
2755 caller is not trusted. For trusted callers, use it only if -F was used to
2756 force its value or if we have a non-SMTP message for which -f was not used
2757 to set the sender. */
2759 if (!sender_host_address)
2761 if (!f.trusted_caller || f.sender_name_forced ||
2762 (!smtp_input && !f.sender_address_forced))
2763 oname = originator_name;
2766 /* For non-locally submitted messages, the only time we use the originator
2767 name is when it was forced by the /name= option on control=submission. */
2769 else if (submission_name) oname = submission_name;
2771 /* Envelope sender is empty */
2773 if (!*sender_address)
2775 uschar *fromstart, *fromend;
2777 fromstart = string_sprintf("%sFrom: %s%s",
2778 resent_prefix, oname, *oname ? " <" : "");
2779 fromend = *oname ? US">" : US"";
2781 if (f.sender_local || f.local_error_message)
2782 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2783 local_part_quote(originator_login), qualify_domain_sender,
2786 else if (f.submission_mode && authenticated_id)
2788 if (!submission_domain)
2789 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2790 local_part_quote(authenticated_id), qualify_domain_sender,
2793 else if (!*submission_domain) /* empty => whole address set */
2794 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2798 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2799 local_part_quote(authenticated_id), submission_domain, fromend);
2801 from_header = header_last; /* To get it checked for Sender: */
2805 /* There is a non-null envelope sender. Build the header using the original
2806 sender address, before any rewriting that might have been done while
2811 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2814 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2817 from_header = header_last; /* To get it checked for Sender: */
2822 /* If the sender is local (without suppress_local_fixups), or if we are in
2823 submission mode and there is an authenticated_id, check that an existing From:
2824 is correct, and if not, generate a Sender: header, unless disabled. Any
2825 previously-existing Sender: header was removed above. Note that sender_local,
2826 as well as being TRUE if the caller of exim is not trusted, is also true if a
2827 trusted caller did not supply a -f argument for non-smtp input. To allow
2828 trusted callers to forge From: without supplying -f, we have to test explicitly
2829 here. If the From: header contains more than one address, then the call to
2830 parse_extract_address fails, and a Sender: header is inserted, as required. */
2833 && ( f.active_local_from_check
2834 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2835 || f.submission_mode && authenticated_id
2838 BOOL make_sender = TRUE;
2839 int start, end, domain;
2841 uschar *from_address =
2842 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2843 &start, &end, &domain, FALSE);
2844 uschar *generated_sender_address;
2846 generated_sender_address = f.submission_mode
2847 ? !submission_domain
2848 ? string_sprintf("%s@%s",
2849 local_part_quote(authenticated_id), qualify_domain_sender)
2850 : !*submission_domain /* empty => full address */
2851 ? string_sprintf("%s", authenticated_id)
2852 : string_sprintf("%s@%s",
2853 local_part_quote(authenticated_id), submission_domain)
2854 : string_sprintf("%s@%s",
2855 local_part_quote(originator_login), qualify_domain_sender);
2857 /* Remove permitted prefixes and suffixes from the local part of the From:
2858 address before doing the comparison with the generated sender. */
2863 uschar *at = domain ? from_address + domain - 1 : NULL;
2866 from_address += route_check_prefix(from_address, local_from_prefix);
2867 slen = route_check_suffix(from_address, local_from_suffix);
2870 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2871 from_address += slen;
2875 if ( strcmpic(generated_sender_address, from_address) == 0
2876 || (!domain && strcmpic(from_address, originator_login) == 0))
2877 make_sender = FALSE;
2880 /* We have to cause the Sender header to be rewritten if there are
2881 appropriate rewriting rules. */
2884 if (f.submission_mode && !submission_name)
2885 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2886 generated_sender_address);
2888 header_add(htype_sender, "%sSender: %s <%s>\n",
2890 f.submission_mode ? submission_name : originator_name,
2891 generated_sender_address);
2893 /* Ensure that a non-null envelope sender address corresponds to the
2894 submission mode sender address. */
2896 if (f.submission_mode && *sender_address)
2898 if (!sender_address_unrewritten)
2899 sender_address_unrewritten = sender_address;
2900 sender_address = generated_sender_address;
2901 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2902 log_write(L_address_rewrite, LOG_MAIN,
2903 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2904 sender_address_unrewritten, generated_sender_address);
2908 /* If there are any rewriting rules, apply them to the sender address, unless
2909 it has already been rewritten as part of verification for SMTP input. */
2911 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2913 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2914 global_rewrite_rules, rewrite_existflags);
2915 DEBUG(D_receive|D_rewrite)
2916 debug_printf("rewritten sender = %s\n", sender_address);
2920 /* The headers must be run through rewrite_header(), because it ensures that
2921 addresses are fully qualified, as well as applying any rewriting rules that may
2924 Qualification of header addresses in a message from a remote host happens only
2925 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2926 appropriate. For local messages, qualification always happens, unless -bnq is
2927 used to explicitly suppress it. No rewriting is done for an unqualified address
2928 that is left untouched.
2930 We start at the second header, skipping our own Received:. This rewriting is
2931 documented as happening *after* recipient addresses are taken from the headers
2932 by the -t command line option. An added Sender: gets rewritten here. */
2934 for (h = header_list->next; h; h = h->next)
2936 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2937 rewrite_existflags, TRUE);
2942 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2943 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2944 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2945 exists, this applies to the set of resent- headers rather than the normal set.
2947 The requirement for a recipient header has been removed in RFC 2822. At this
2948 point in the code, earlier versions of Exim added a To: header for locally
2949 submitted messages, and an empty Bcc: header for others. In the light of the
2950 changes in RFC 2822, this was dropped in November 2003. */
2953 /* If there is no date header, generate one if the message originates locally
2954 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2955 submission mode flag is set. Messages without Date: are not valid, but it seems
2956 to be more confusing if Exim adds one to all remotely-originated messages.
2957 As per Message-Id, we prepend if resending, else append.
2960 if ( !date_header_exists
2961 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2962 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2963 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2965 search_tidyup(); /* Free any cached resources */
2967 /* Show the complete set of headers if debugging. Note that the first one (the
2968 new Received:) has not yet been set. */
2972 debug_printf(">>Headers after rewriting and local additions:\n");
2973 for (h = header_list->next; h; h = h->next)
2974 debug_printf("%c %s", h->type, h->text);
2978 /* The headers are now complete in store. If we are running in filter
2979 testing mode, that is all this function does. Return TRUE if the message
2980 ended with a dot. */
2982 if (filter_test != FTEST_NONE)
2984 process_info[process_info_len] = 0;
2985 return message_ended == END_DOT;
2988 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2989 think more if it could be handled. Cannot do onward CHUNKING unless
2990 inbound is, but inbound chunking ought to be ok with outbound plain.
2991 Could we do onward CHUNKING given inbound CHUNKING?
2993 if (chunking_state > CHUNKING_OFFERED)
2994 cancel_cutthrough_connection(FALSE, US"chunking active");
2996 /* Cutthrough delivery:
2997 We have to create the Received header now rather than at the end of reception,
2998 so the timestamp behaviour is a change to the normal case.
2999 Having created it, send the headers to the destination. */
3001 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3003 if (received_count > received_headers_max)
3005 cancel_cutthrough_connection(TRUE, US"too many headers");
3006 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3007 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3008 "Too many \"Received\" headers",
3010 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3011 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3012 message_id[0] = 0; /* Indicate no message accepted */
3013 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3014 goto TIDYUP; /* Skip to end of function */
3016 received_header_gen();
3017 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3018 (void) cutthrough_headers_send();
3022 /* Open a new spool file for the data portion of the message. We need
3023 to access it both via a file descriptor and a stream. Try to make the
3024 directory if it isn't there. */
3026 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3027 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3029 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3031 if (errno == ENOENT)
3033 (void) directory_make(spool_directory,
3034 spool_sname(US"input", message_subdir),
3035 INPUT_DIRECTORY_MODE, TRUE);
3036 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3039 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3040 spool_name, strerror(errno));
3043 /* Make sure the file's group is the Exim gid, and double-check the mode
3044 because the group setting doesn't always get set automatically. */
3046 if (fchown(data_fd, exim_uid, exim_gid))
3047 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3048 "Failed setting ownership on spool file %s: %s",
3049 spool_name, strerror(errno));
3050 (void)fchmod(data_fd, SPOOL_MODE);
3052 /* We now have data file open. Build a stream for it and lock it. We lock only
3053 the first line of the file (containing the message ID) because otherwise there
3054 are problems when Exim is run under Cygwin (I'm told). See comments in
3055 spool_in.c, where the same locking is done. */
3057 spool_data_file = fdopen(data_fd, "w+");
3058 lock_data.l_type = F_WRLCK;
3059 lock_data.l_whence = SEEK_SET;
3060 lock_data.l_start = 0;
3061 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3063 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3064 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3065 errno, strerror(errno));
3067 /* We have an open, locked data file. Write the message id to it to make it
3068 self-identifying. Then read the remainder of the input of this message and
3069 write it to the data file. If the variable next != NULL, it contains the first
3070 data line (which was read as a header but then turned out not to have the right
3071 format); write it (remembering that it might contain binary zeros). The result
3072 of fwrite() isn't inspected; instead we call ferror() below. */
3074 fprintf(spool_data_file, "%s-D\n", message_id);
3077 uschar *s = next->text;
3078 int len = next->slen;
3079 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3080 body_linecount++; /* Assumes only 1 line */
3083 /* Note that we might already be at end of file, or the logical end of file
3084 (indicated by '.'), or might have encountered an error while writing the
3085 message id or "next" line. */
3087 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3091 message_ended = chunking_state <= CHUNKING_OFFERED
3092 ? read_message_data_smtp(spool_data_file)
3094 ? read_message_bdat_smtp_wire(spool_data_file)
3095 : read_message_bdat_smtp(spool_data_file);
3096 receive_linecount++; /* The terminating "." line */
3099 message_ended = read_message_data(spool_data_file);
3101 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3102 message_linecount += body_linecount;
3104 switch (message_ended)
3106 /* Handle premature termination of SMTP */
3111 Uunlink(spool_name); /* Lose data file when closed */
3112 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3113 message_id[0] = 0; /* Indicate no message accepted */
3114 smtp_reply = handle_lost_connection(US"");
3116 goto TIDYUP; /* Skip to end of function */
3120 /* Handle message that is too big. Don't use host_or_ident() in the log
3121 message; we want to see the ident value even for non-remote messages. */
3124 Uunlink(spool_name); /* Lose the data file when closed */
3125 cancel_cutthrough_connection(TRUE, US"mail too big");
3126 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3128 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3129 "message too big: read=%d max=%d",
3131 sender_fullhost ? " H=" : "",
3132 sender_fullhost ? sender_fullhost : US"",
3133 sender_ident ? " U=" : "",
3134 sender_ident ? sender_ident : US"",
3136 thismessage_size_limit);
3140 smtp_reply = US"552 Message size exceeds maximum permitted";
3141 message_id[0] = 0; /* Indicate no message accepted */
3142 goto TIDYUP; /* Skip to end of function */
3146 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3147 give_local_error(ERRMESS_TOOBIG,
3148 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3149 US"message rejected: ", error_rc, spool_data_file, header_list);
3150 /* Does not return */
3154 /* Handle bad BDAT protocol sequence */
3157 Uunlink(spool_name); /* Lose the data file when closed */
3158 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3159 smtp_reply = US""; /* Response already sent */
3160 message_id[0] = 0; /* Indicate no message accepted */
3161 goto TIDYUP; /* Skip to end of function */
3165 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3166 example, there may be some expansion in an ACL that uses a timer.) */
3168 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3170 /* The message body has now been read into the data file. Call fflush() to
3171 empty the buffers in C, and then call fsync() to get the data written out onto
3172 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3173 having to do this). If there was an I/O error on either input or output,
3174 attempt to send an error message, and unlink the spool file. For non-SMTP input
3175 we can then give up. Note that for SMTP input we must swallow the remainder of
3176 the input in cases of output errors, since the far end doesn't expect to see
3177 anything until the terminating dot line is sent. */
3179 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3180 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3182 uschar *msg_errno = US strerror(errno);
3183 BOOL input_error = (receive_ferror)() != 0;
3184 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3185 input_error? "Input read" : "Spool write",
3187 sender_fullhost ? sender_fullhost : sender_ident);
3189 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3190 Uunlink(spool_name); /* Lose the data file */
3191 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3196 smtp_reply = US"451 Error while reading input data";
3199 smtp_reply = US"451 Error while writing spool file";
3200 receive_swallow_smtp();
3202 message_id[0] = 0; /* Indicate no message accepted */
3203 goto TIDYUP; /* Skip to end of function */
3208 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3209 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3211 /* Does not return */
3216 /* No I/O errors were encountered while writing the data file. */
3218 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3219 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3222 /* If there were any bad addresses extracted by -t, or there were no recipients
3223 left after -t, send a message to the sender of this message, or write it to
3224 stderr if the error handling option is set that way. Note that there may
3225 legitimately be no recipients for an SMTP message if they have all been removed
3228 We need to rewind the data file in order to read it. In the case of no
3229 recipients or stderr error writing, throw the data file away afterwards, and
3230 exit. (This can't be SMTP, which always ensures there's at least one
3231 syntactically good recipient address.) */
3233 if (extract_recip && (bad_addresses || recipients_count == 0))
3237 if (recipients_count == 0) debug_printf("*** No recipients\n");
3240 error_block *eblock = bad_addresses;
3241 debug_printf("*** Bad address(es)\n");
3242 while (eblock != NULL)
3244 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3245 eblock = eblock->next;
3250 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3252 /* If configured to send errors to the sender, but this fails, force
3253 a failure error code. We use a special one for no recipients so that it
3254 can be detected by the autoreply transport. Otherwise error_rc is set to
3255 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3256 it is EXIT_SUCCESS. */
3258 if (error_handling == ERRORS_SENDER)
3260 if (!moan_to_sender(
3261 (bad_addresses == NULL)?
3262 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3263 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3264 bad_addresses, header_list, spool_data_file, FALSE))
3265 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3270 if (extracted_ignored)
3271 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3273 fprintf(stderr, "exim: no recipients in message\n");
3276 fprintf(stderr, "exim: invalid address%s",
3277 bad_addresses->next ? "es:\n" : ":");
3278 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3279 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3280 bad_addresses->text2);
3284 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3286 Uunlink(spool_name);
3287 (void)fclose(spool_data_file);
3288 exim_exit(error_rc, US"receiving");
3292 /* Data file successfully written. Generate text for the Received: header by
3293 expanding the configured string, and adding a timestamp. By leaving this
3294 operation till now, we ensure that the timestamp is the time that message
3295 reception was completed. However, this is deliberately done before calling the
3296 data ACL and local_scan().
3298 This Received: header may therefore be inspected by the data ACL and by code in
3299 the local_scan() function. When they have run, we update the timestamp to be
3300 the final time of reception.
3302 If there is just one recipient, set up its value in the $received_for variable
3303 for use when we generate the Received: header.
3305 Note: the checking for too many Received: headers is handled by the delivery
3307 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3309 if (!received_header->text) /* Non-cutthrough case */
3311 received_header_gen();
3313 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3315 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3316 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3318 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3319 now, before running the DATA ACL. */
3321 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3324 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3325 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3327 /* If an ACL is specified for checking things at this stage of reception of a
3328 message, run it, unless all the recipients were removed by "discard" in earlier
3329 ACLs. That is the only case in which recipients_count can be zero at this
3330 stage. Set deliver_datafile to point to the data file so that $message_body and
3331 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3334 deliver_datafile = data_fd;
3337 f.enable_dollar_recipients = TRUE;
3339 if (recipients_count == 0)
3340 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3344 /* Handle interactive SMTP messages */
3346 if (smtp_input && !smtp_batched_input)
3349 #ifndef DISABLE_DKIM
3350 if (!f.dkim_disable_verify)
3352 /* Finish verification */
3353 dkim_exim_verify_finish();
3355 /* Check if we must run the DKIM ACL */
3356 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3358 uschar * dkim_verify_signers_expanded =
3359 expand_string(dkim_verify_signers);
3360 gstring * results = NULL;
3364 gstring * seen_items = NULL;
3365 int old_pool = store_pool;
3367 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3369 if (!(ptr = dkim_verify_signers_expanded))
3370 log_write(0, LOG_MAIN|LOG_PANIC,
3371 "expansion of dkim_verify_signers option failed: %s",
3372 expand_string_message);
3374 /* Default to OK when no items are present */
3376 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3378 /* Prevent running ACL for an empty item */
3379 if (!item || !*item) continue;
3381 /* Only run ACL once for each domain or identity,
3382 no matter how often it appears in the expanded list. */
3386 const uschar * seen_items_list = string_from_gstring(seen_items);
3388 BOOL seen_this_item = FALSE;
3390 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3392 if (Ustrcmp(seen_item,item) == 0)
3394 seen_this_item = TRUE;
3401 debug_printf("acl_smtp_dkim: skipping signer %s, "
3402 "already seen\n", item);
3406 seen_items = string_catn(seen_items, US":", 1);
3408 seen_items = string_cat(seen_items, item);
3410 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3414 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3415 "skipping remaining items\n", rc, item);
3416 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3420 dkim_verify_status = string_from_gstring(results);
3421 store_pool = old_pool;
3422 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3425 recipients_count = 0;
3426 blackholed_by = US"DKIM ACL";
3428 blackhole_log_msg = string_sprintf(": %s", log_msg);
3432 Uunlink(spool_name);
3433 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3434 smtp_yield = FALSE; /* No more messages after dropped connection */
3435 smtp_reply = US""; /* Indicate reply already sent */
3436 message_id[0] = 0; /* Indicate no message accepted */
3437 goto TIDYUP; /* Skip to end of function */
3441 dkim_exim_verify_log_all();
3443 #endif /* DISABLE_DKIM */
3445 #ifdef WITH_CONTENT_SCAN
3446 if ( recipients_count > 0
3448 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3451 #endif /* WITH_CONTENT_SCAN */
3453 #ifdef EXPERIMENTAL_DMARC
3454 dmarc_up = dmarc_store_data(from_header);
3455 #endif /* EXPERIMENTAL_DMARC */
3457 #ifndef DISABLE_PRDR
3458 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3462 int all_fail = FAIL;
3464 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3465 /* Loop through recipients, responses must be in same order received */
3466 for (c = 0; recipients_count > c; c++)
3468 uschar * addr= recipients_list[c].address;
3469 uschar * msg= US"PRDR R=<%s> %s";
3472 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3473 addr, c+1, recipients_count);
3474 rc = acl_check(ACL_WHERE_PRDR, addr,
3475 acl_smtp_data_prdr, &user_msg, &log_msg);
3477 /* If any recipient rejected content, indicate it in final message */
3479 /* If all recipients rejected, indicate in final message */
3484 case OK: case DISCARD: code = US"250"; break;
3485 case DEFER: code = US"450"; break;
3486 default: code = US"550"; break;
3488 if (user_msg != NULL)
3489 smtp_user_msg(code, user_msg);
3494 case OK: case DISCARD:
3495 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3497 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3499 msg = string_sprintf(CS msg, addr, "refusal"); break;
3501 smtp_user_msg(code, msg);
3503 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3504 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3505 else log_write(0, LOG_MAIN, "%s", CS msg);
3507 if (rc != OK) { receive_remove_recipient(addr); c--; }
3509 /* Set up final message, used if data acl gives OK */
3510 smtp_reply = string_sprintf("%s id=%s message %s",
3511 all_fail == FAIL ? US"550" : US"250",
3514 ? US"rejected for all recipients"
3517 : US"accepted for some recipients");
3518 if (recipients_count == 0)
3520 message_id[0] = 0; /* Indicate no message accepted */
3525 prdr_requested = FALSE;
3526 #endif /* !DISABLE_PRDR */
3528 /* Check the recipients count again, as the MIME ACL might have changed
3531 if (acl_smtp_data != NULL && recipients_count > 0)
3533 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3534 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3537 recipients_count = 0;
3538 blackholed_by = US"DATA ACL";
3540 blackhole_log_msg = string_sprintf(": %s", log_msg);
3541 cancel_cutthrough_connection(TRUE, US"data acl discard");
3545 Uunlink(spool_name);
3546 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3547 #ifdef WITH_CONTENT_SCAN
3550 #ifdef EXPERIMENTAL_DCC
3553 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3554 smtp_yield = FALSE; /* No more messages after dropped connection */
3555 smtp_reply = US""; /* Indicate reply already sent */
3556 message_id[0] = 0; /* Indicate no message accepted */
3557 goto TIDYUP; /* Skip to end of function */
3562 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3563 we cannot take different actions for permanent and temporary rejections. */
3568 #ifdef WITH_CONTENT_SCAN
3569 if ( acl_not_smtp_mime
3570 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3574 #endif /* WITH_CONTENT_SCAN */
3578 uschar *user_msg, *log_msg;
3579 f.authentication_local = TRUE;
3580 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3583 recipients_count = 0;
3584 blackholed_by = US"non-SMTP ACL";
3586 blackhole_log_msg = string_sprintf(": %s", log_msg);
3590 Uunlink(spool_name);
3591 #ifdef WITH_CONTENT_SCAN
3594 #ifdef EXPERIMENTAL_DCC
3597 /* The ACL can specify where rejections are to be logged, possibly
3598 nowhere. The default is main and reject logs. */
3600 if (log_reject_target)
3601 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3602 sender_address, log_msg);
3604 if (!user_msg) user_msg = US"local configuration problem";
3605 if (smtp_batched_input)
3606 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3607 /* Does not return */
3610 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3611 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3612 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3614 /* Does not return */
3617 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3621 /* The applicable ACLs have been run */
3623 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3624 if (f.queue_only_policy) queued_by = US"ACL";
3627 #ifdef WITH_CONTENT_SCAN
3631 #ifdef EXPERIMENTAL_DCC
3636 #ifdef HAVE_LOCAL_SCAN
3637 /* The final check on the message is to run the scan_local() function. The
3638 version supplied with Exim always accepts, but this is a hook for sysadmins to
3639 supply their own checking code. The local_scan() function is run even when all
3640 the recipients have been discarded. */
3642 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3644 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3645 deleted, and the incident gets logged. */
3647 if (sigsetjmp(local_scan_env, 1) == 0)
3649 had_local_scan_crash = 0;
3650 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3651 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3652 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3653 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3655 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3656 local_scan_timeout);
3657 local_scan_data = NULL;
3659 had_local_scan_timeout = 0;
3660 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3661 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3662 rc = local_scan(data_fd, &local_scan_data);
3664 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3666 f.enable_dollar_recipients = FALSE;
3668 store_pool = POOL_MAIN; /* In case changed */
3669 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3672 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3673 os_non_restarting_signal(SIGFPE, SIG_DFL);
3674 os_non_restarting_signal(SIGILL, SIG_DFL);
3675 os_non_restarting_signal(SIGBUS, SIG_DFL);
3679 if (had_local_scan_crash)
3681 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3682 "signal %d - message temporarily rejected (size %d)",
3683 had_local_scan_crash, message_size);
3684 receive_bomb_out(US"local-scan-error", US"local verification problem");
3685 /* Does not return */
3687 if (had_local_scan_timeout)
3689 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3690 "message temporarily rejected (size %d)", message_size);
3691 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3692 /* Does not return */
3696 /* The length check is paranoia against some runaway code, and also because
3697 (for a success return) lines in the spool file are read into big_buffer. */
3699 if (local_scan_data)
3701 int len = Ustrlen(local_scan_data);
3702 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3703 local_scan_data = string_copyn(local_scan_data, len);
3706 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3708 if (!f.deliver_freeze) /* ACL might have already frozen */
3710 f.deliver_freeze = TRUE;
3711 deliver_frozen_at = time(NULL);
3712 frozen_by = US"local_scan()";
3714 rc = LOCAL_SCAN_ACCEPT;
3716 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3718 if (!f.queue_only_policy) /* ACL might have already queued */
3720 f.queue_only_policy = TRUE;
3721 queued_by = US"local_scan()";
3723 rc = LOCAL_SCAN_ACCEPT;
3726 /* Message accepted: remove newlines in local_scan_data because otherwise
3727 the spool file gets corrupted. Ensure that all recipients are qualified. */
3729 if (rc == LOCAL_SCAN_ACCEPT)
3731 if (local_scan_data)
3734 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3736 for (i = 0; i < recipients_count; i++)
3738 recipient_item *r = recipients_list + i;
3739 r->address = rewrite_address_qualify(r->address, TRUE);
3740 if (r->errors_to != NULL)
3741 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3743 if (recipients_count == 0 && blackholed_by == NULL)
3744 blackholed_by = US"local_scan";
3747 /* Message rejected: newlines permitted in local_scan_data to generate
3748 multiline SMTP responses. */
3752 uschar *istemp = US"";
3756 errmsg = local_scan_data;
3758 Uunlink(spool_name); /* Cancel this message */
3762 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3763 "rejection given", rc);
3766 case LOCAL_SCAN_REJECT_NOLOGHDR:
3767 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3770 case LOCAL_SCAN_REJECT:
3771 smtp_code = US"550";
3772 if (!errmsg) errmsg = US"Administrative prohibition";
3775 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3776 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3779 case LOCAL_SCAN_TEMPREJECT:
3781 smtp_code = US"451";
3782 if (!errmsg) errmsg = US"Temporary local problem";
3783 istemp = US"temporarily ";
3787 g = string_append(NULL, 2, US"F=",
3788 sender_address[0] == 0 ? US"<>" : sender_address);
3789 g = add_host_info_for_log(g);
3791 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3792 string_from_gstring(g), istemp, string_printing(errmsg));
3796 if (!smtp_batched_input)
3798 smtp_respond(smtp_code, 3, TRUE, errmsg);
3799 message_id[0] = 0; /* Indicate no message accepted */
3800 smtp_reply = US""; /* Indicate reply already sent */
3801 goto TIDYUP; /* Skip to end of function */
3804 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3805 /* Does not return */
3809 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3810 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3811 US"message rejected by local scan code: ", error_rc, spool_data_file,
3813 /* Does not return */
3817 /* Reset signal handlers to ignore signals that previously would have caused
3818 the message to be abandoned. */
3820 signal(SIGTERM, SIG_IGN);
3821 signal(SIGINT, SIG_IGN);
3822 #endif /* HAVE_LOCAL_SCAN */
3825 /* Ensure the first time flag is set in the newly-received message. */
3827 f.deliver_firsttime = TRUE;
3829 #ifdef EXPERIMENTAL_BRIGHTMAIL
3831 { /* rewind data file */
3832 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3833 bmi_verdicts = bmi_process_message(header_list, data_fd);
3837 /* Update the timestamp in our Received: header to account for any time taken by
3838 an ACL or by local_scan(). The new time is the time that all reception
3839 processing is complete. */
3841 timestamp = expand_string(US"${tod_full}");
3842 tslen = Ustrlen(timestamp);
3844 memcpy(received_header->text + received_header->slen - tslen - 1,
3847 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3851 f.deliver_freeze = FALSE;
3852 f.queue_only_policy = FALSE;
3855 /* Keep the data file open until we have written the header file, in order to
3856 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3857 don't write the header file, and we unlink the data file. If writing the header
3858 file fails, we have failed to accept this message. */
3860 if (host_checking || blackholed_by)
3863 Uunlink(spool_name);
3864 msg_size = 0; /* Compute size for log line */
3865 for (h = header_list; h; h = h->next)
3866 if (h->type != '*') msg_size += h->slen;
3869 /* Write the -H file */
3872 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3874 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3875 Uunlink(spool_name); /* Lose the data file */
3879 smtp_reply = US"451 Error in writing spool file";
3880 message_id[0] = 0; /* Indicate no message accepted */
3885 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3886 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3888 /* Does not return */
3893 /* The message has now been successfully received. */
3895 receive_messagecount++;
3897 /* Add data size to written header size. We do not count the initial file name
3898 that is in the file, but we do add one extra for the notional blank line that
3899 precedes the data. This total differs from message_size in that it include the
3900 added Received: header and any other headers that got created locally. */
3902 if (fflush(spool_data_file))
3904 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3905 log_write(0, LOG_MAIN, "%s\n", errmsg);
3906 Uunlink(spool_name); /* Lose the data file */
3910 smtp_reply = US"451 Error in writing spool file";
3911 message_id[0] = 0; /* Indicate no message accepted */
3916 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3917 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3919 /* Does not return */
3922 fstat(data_fd, &statbuf);
3924 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3926 /* Generate a "message received" log entry. We do this by building up a dynamic
3927 string as required. We log the arrival of a new message while the
3928 file is still locked, just in case the machine is *really* fast, and delivers
3929 it first! Include any message id that is in the message - since the syntax of a
3930 message id is actually an addr-spec, we can use the parse routine to canonicalize
3933 g = string_get(256);
3935 g = string_append(g, 2,
3936 fake_response == FAIL ? US"(= " : US"<= ",
3937 sender_address[0] == 0 ? US"<>" : sender_address);
3938 if (message_reference)
3939 g = string_append(g, 2, US" R=", message_reference);
3941 g = add_host_info_for_log(g);
3944 if (LOGGING(tls_cipher) && tls_in.cipher)
3945 g = string_append(g, 2, US" X=", tls_in.cipher);
3946 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3947 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3948 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3949 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3950 if (LOGGING(tls_sni) && tls_in.sni)
3951 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3954 if (sender_host_authenticated)
3956 g = string_append(g, 2, US" A=", sender_host_authenticated);
3957 if (authenticated_id)
3959 g = string_append(g, 2, US":", authenticated_id);
3960 if (LOGGING(smtp_mailauth) && authenticated_sender)
3961 g = string_append(g, 2, US":", authenticated_sender);
3965 #ifndef DISABLE_PRDR
3967 g = string_catn(g, US" PRDR", 5);
3970 #ifdef SUPPORT_PROXY
3971 if (proxy_session && LOGGING(proxy))
3972 g = string_append(g, 2, US" PRX=", proxy_local_address);
3975 if (chunking_state > CHUNKING_OFFERED)
3976 g = string_catn(g, US" K", 2);
3978 sprintf(CS big_buffer, "%d", msg_size);
3979 g = string_append(g, 2, US" S=", big_buffer);
3981 /* log 8BITMIME mode announced in MAIL_FROM
3985 if (LOGGING(8bitmime))
3987 sprintf(CS big_buffer, "%d", body_8bitmime);
3988 g = string_append(g, 2, US" M8S=", big_buffer);
3991 #ifndef DISABLE_DKIM
3992 if (LOGGING(dkim) && dkim_verify_overall)
3993 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
3994 # ifdef EXPERIMENTAL_ARC
3995 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
3996 g = string_catn(g, US" ARC", 4);
4000 if (LOGGING(receive_time))
4001 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
4004 g = string_append(g, 2, US" Q=", queue_name);
4006 /* If an addr-spec in a message-id contains a quoted string, it can contain
4007 any characters except " \ and CR and so in particular it can contain NL!
4008 Therefore, make sure we use a printing-characters only version for the log.
4009 Also, allow for domain literals in the message id. */
4014 BOOL save_allow_domain_literals = allow_domain_literals;
4015 allow_domain_literals = TRUE;
4016 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4017 &errmsg, &start, &end, &domain, FALSE);
4018 allow_domain_literals = save_allow_domain_literals;
4020 g = string_append(g, 2, US" id=", string_printing(old_id));
4023 /* If subject logging is turned on, create suitable printing-character
4024 text. By expanding $h_subject: we make use of the MIME decoding. */
4026 if (LOGGING(subject) && subject_header)
4029 uschar *p = big_buffer;
4030 uschar *ss = expand_string(US"$h_subject:");
4032 /* Backslash-quote any double quotes or backslashes so as to make a
4033 a C-like string, and turn any non-printers into escape sequences. */
4036 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4038 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4043 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4046 /* Terminate the string: string_cat() and string_append() leave room, but do
4047 not put the zero in. */
4049 (void) string_from_gstring(g);
4051 /* Create a message log file if message logs are being used and this message is
4052 not blackholed. Write the reception stuff to it. We used to leave message log
4053 creation until the first delivery, but this has proved confusing for some
4056 if (message_logs && !blackholed_by)
4059 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4061 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4065 (void)directory_make(spool_directory,
4066 spool_sname(US"msglog", message_subdir),
4067 MSGLOG_DIRECTORY_MODE, TRUE);
4068 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4072 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4073 m_name, strerror(errno));
4076 FILE *message_log = fdopen(fd, "a");
4079 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4080 m_name, strerror(errno));
4085 uschar *now = tod_stamp(tod_log);
4086 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4087 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4089 if (f.queue_only_policy) fprintf(message_log,
4090 "%s no immediate delivery: queued%s%s by %s\n", now,
4091 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4093 (void)fclose(message_log);
4098 /* Everything has now been done for a successful message except logging its
4099 arrival, and outputting an SMTP response. While writing to the log, set a flag
4100 to cause a call to receive_bomb_out() if the log cannot be opened. */
4102 f.receive_call_bombout = TRUE;
4104 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4105 connection has gone away. This can only be done if there is no unconsumed input
4106 waiting in the local input buffer. We can test for this by calling
4107 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4108 input to be sent following the final dot, so the presence of following input is
4111 If the connection is still present, but there is no unread input for the
4112 socket, the result of a select() call will be zero. If, however, the connection
4113 has gone away, or if there is pending input, the result of select() will be
4114 non-zero. The two cases can be distinguished by trying to read the next input
4115 character. If we succeed, we can unread it so that it remains in the local
4116 buffer for handling later. If not, the connection has been lost.
4118 Of course, since TCP/IP is asynchronous, there is always a chance that the
4119 connection will vanish between the time of this test and the sending of the
4120 response, but the chance of this happening should be small. */
4122 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4123 !receive_smtp_buffered())
4126 fd_set select_check;
4127 FD_ZERO(&select_check);
4128 FD_SET(fileno(smtp_in), &select_check);
4132 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4134 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4135 if (c != EOF) (receive_ungetc)(c); else
4137 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4138 smtp_reply = US""; /* No attempt to send a response */
4139 smtp_yield = FALSE; /* Nothing more on this connection */
4141 /* Re-use the log line workspace */
4144 g = string_cat(g, US"SMTP connection lost after final dot");
4145 g = add_host_info_for_log(g);
4146 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4148 /* Delete the files for this aborted message. */
4150 Uunlink(spool_name);
4151 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4152 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4159 /* The connection has not gone away; we really are going to take responsibility
4160 for this message. */
4162 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4165 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4166 the sender's dot (below).
4167 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4168 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4169 in which case pass temp-reject back to initiator and dump the files.
4171 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4173 XXX We do not handle queue-only, freezing, or blackholes.
4175 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4177 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4178 /* Logging was done in finaldot() */
4181 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4182 cutthrough_done = ACCEPTED;
4183 break; /* message_id needed for SMTP accept below */
4185 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4186 ... for which, pass back the exact error */
4187 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4188 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4189 break; /* message_id needed for SMTP accept below */
4191 default: /* Unknown response, or error. Treat as temp-reject. */
4192 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4193 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4194 break; /* message_id needed for SMTP accept below */
4196 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4197 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4198 cutthrough_done = PERM_REJ;
4203 #ifndef DISABLE_PRDR
4204 if(!smtp_reply || prdr_requested)
4209 log_write(0, LOG_MAIN |
4210 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4211 (LOGGING(received_sender) ? LOG_SENDER : 0),
4214 /* Log any control actions taken by an ACL or local_scan(). */
4216 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4217 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4218 "no immediate delivery: queued%s%s by %s",
4219 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4222 f.receive_call_bombout = FALSE;
4224 store_reset(g); /* The store for the main log message can be reused */
4226 /* If the message is frozen, and freeze_tell is set, do the telling. */
4228 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4229 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4230 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4231 message_id, frozen_by, sender_address);
4234 /* Either a message has been successfully received and written to the two spool
4235 files, or an error in writing the spool has occurred for an SMTP message, or
4236 an SMTP message has been rejected for policy reasons, or a message was passed on
4237 by cutthrough delivery. (For a non-SMTP message we will have already given up
4238 because there's no point in carrying on!) For non-cutthrough we must now close
4239 (and thereby unlock) the data file. In the successful case, this leaves the
4240 message on the spool, ready for delivery. In the error case, the spool file will
4241 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4244 For cutthrough we hold the data file locked until we have deleted it, otherwise
4245 a queue-runner could grab it in the window.
4247 A fflush() was done earlier in the expectation that any write errors on the
4248 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4249 possible for fclose() to fail - but what to do? What has happened to the lock
4250 if this happens? We can at least log it; if it is observed on some platform
4251 then we can think about properly declaring the message not-received. */
4255 /* In SMTP sessions we may receive several messages in one connection. After
4256 each one, we wait for the clock to tick at the level of message-id granularity.
4257 This is so that the combination of time+pid is unique, even on systems where the
4258 pid can be re-used within our time interval. We can't shorten the interval
4259 without re-designing the message-id. See comments above where the message id is
4260 created. This is Something For The Future.
4261 Do this wait any time we have created a message-id, even if we rejected the
4262 message. This gives unique IDs for logging done by ACLs. */
4264 if (id_resolution != 0)
4266 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
4267 exim_wait_tick(&message_id_tv, id_resolution);
4272 process_info[process_info_len] = 0; /* Remove message id */
4273 if (spool_data_file && cutthrough_done == NOT_TRIED)
4275 if (fclose(spool_data_file)) /* Frees the lock */
4276 log_write(0, LOG_MAIN|LOG_PANIC,
4277 "spoolfile error on close: %s", strerror(errno));
4278 spool_data_file = NULL;
4281 /* Now reset signal handlers to their defaults */
4283 signal(SIGTERM, SIG_DFL);
4284 signal(SIGINT, SIG_DFL);
4286 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4287 value, which defaults TRUE - meaning there may be more incoming messages from
4288 this connection. For non-SMTP callers (where there is only ever one message),
4289 the default is FALSE. */
4295 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4296 is set to the response that should be sent. When it is NULL, we generate
4297 default responses. After an ACL error or local_scan() error, the response has
4298 already been sent, and smtp_reply is an empty string to indicate this. */
4300 if (!smtp_batched_input)
4304 if (fake_response != OK)
4305 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4306 3, TRUE, fake_response_text);
4308 /* An OK response is required; use "message" text if present. */
4312 uschar *code = US"250";
4314 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4315 smtp_respond(code, len, TRUE, user_msg);
4318 /* Default OK response */
4320 else if (chunking_state > CHUNKING_OFFERED)
4322 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4323 chunking_datasize, message_size+message_linecount, message_id);
4324 chunking_state = CHUNKING_OFFERED;
4327 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4331 "\n**** SMTP testing: that is not a real message id!\n\n");
4334 /* smtp_reply is set non-empty */
4336 else if (smtp_reply[0] != 0)
4337 if (fake_response != OK && smtp_reply[0] == '2')
4338 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4339 fake_response_text);
4341 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4343 switch (cutthrough_done)
4346 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4348 /* Delete spool files */
4349 Uunlink(spool_name);
4350 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4351 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4355 if (cutthrough.defer_pass)
4357 Uunlink(spool_name);
4358 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4359 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4364 if (cutthrough_done != NOT_TRIED)
4366 if (spool_data_file)
4368 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4369 spool_data_file = NULL;
4371 message_id[0] = 0; /* Prevent a delivery from starting */
4372 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4373 cutthrough.defer_pass = FALSE;
4377 /* For batched SMTP, generate an error message on failure, and do
4378 nothing on success. The function moan_smtp_batch() does not return -
4379 it exits from the program with a non-zero return code. */
4381 else if (smtp_reply)
4382 moan_smtp_batch(NULL, "%s", smtp_reply);
4386 /* If blackholing, we can immediately log this message's sad fate. The data
4387 file has already been unlinked, and the header file was never written to disk.
4388 We must now indicate that nothing was received, to prevent a delivery from
4393 const uschar *detail =
4394 #ifdef HAVE_LOCAL_SCAN
4395 local_scan_data ? string_printing(local_scan_data) :
4397 string_sprintf("(%s discarded recipients)", blackholed_by);
4398 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4399 log_write(0, LOG_MAIN, "Completed");
4403 /* Reset headers so that logging of rejects for a subsequent message doesn't
4404 include them. It is also important to set header_last = NULL before exiting
4405 from this function, as this prevents certain rewrites that might happen during
4406 subsequent verifying (of another incoming message) from trying to add headers
4407 when they shouldn't. */
4409 header_list = header_last = NULL;
4411 return yield; /* TRUE if more messages (SMTP only) */
4414 /* End of receive.c */