1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
12 #ifdef EXPERIMENTAL_DCC
16 #ifdef EXPERIMENTAL_DMARC
18 #endif /* EXPERIMENTAL_DMARC */
20 /*************************************************
21 * Local static variables *
22 *************************************************/
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
31 /*************************************************
32 * Non-SMTP character reading functions *
33 *************************************************/
35 /* These are the default functions that are set up in the variables such as
36 receive_getc initially. They just call the standard functions, passing stdin as
37 the file. (When SMTP input is occurring, different functions are used by
38 changing the pointer variables.) */
41 stdin_getc(unsigned lim)
49 return ungetc(c, stdin);
67 /*************************************************
68 * Check that a set sender is allowed *
69 *************************************************/
71 /* This function is called when a local caller sets an explicit sender address.
72 It checks whether this is permitted, which it is for trusted callers.
73 Otherwise, it must match the pattern(s) in untrusted_set_sender.
75 Arguments: the proposed sender address
76 Returns: TRUE for a trusted caller
77 TRUE if the address has been set, untrusted_set_sender has been
78 set, and the address matches something in the list
83 receive_check_set_sender(uschar *newsender)
86 if (trusted_caller) return TRUE;
87 if (!newsender || !untrusted_set_sender) return FALSE;
88 qnewsender = Ustrchr(newsender, '@')
89 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
96 /*************************************************
97 * Read space info for a partition *
98 *************************************************/
100 /* This function is called by receive_check_fs() below, and also by string
101 expansion for variables such as $spool_space. The field names for the statvfs
102 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
103 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
104 have inodes, and they return -1 for the number available.
106 Later: It turns out that some file systems that do not have the concept of
107 inodes return 0 rather than -1. Such systems should also return 0 for the total
108 number of inodes, so we require that to be greater than zero before returning
112 isspool TRUE for spool partition, FALSE for log partition
113 inodeptr address of int to receive inode count; -1 if there isn't one
115 Returns: available on-root space, in kilobytes
116 -1 for log partition if there isn't one
118 All values are -1 if the STATFS functions are not available.
122 receive_statvfs(BOOL isspool, int *inodeptr)
125 struct STATVFS statbuf;
131 /* The spool directory must always exist. */
135 path = spool_directory;
139 /* Need to cut down the log file path to the directory, and to ignore any
140 appearance of "syslog" in it. */
144 int sep = ':'; /* Not variable - outside scripts use */
145 const uschar *p = log_file_path;
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
151 if (*p == 0) p = US":";
152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
153 if (Ustrcmp(path, "syslog") != 0)
156 if (path == NULL) /* No log files */
162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
164 subdirectory has been symbolically linked elsewhere. */
168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
178 /* We now have the path; do the business */
180 memset(&statbuf, 0, sizeof(statbuf));
182 if (STATVFS(CS path, &statbuf) != 0)
183 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
184 { /* Can happen on first run after installation */
190 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
191 "%s directory %s: %s", name, path, strerror(errno));
192 smtp_closedown(US"spool or log directory problem");
193 exim_exit(EXIT_FAILURE, NULL);
196 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
198 /* Disks are getting huge. Take care with computing the size in kilobytes. */
200 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
203 /* Unable to find partition sizes in this environment. */
213 /*************************************************
214 * Check space on spool and log partitions *
215 *************************************************/
217 /* This function is called before accepting a message; if any thresholds are
218 set, it checks them. If a message_size is supplied, it checks that there is
219 enough space for that size plus the threshold - i.e. that the message won't
220 reduce the space to the threshold. Not all OS have statvfs(); for those that
221 don't, this function always returns TRUE. For some OS the old function and
222 struct name statfs is used; that is handled by a macro, defined in exim.h.
225 msg_size the (estimated) size of an incoming message
227 Returns: FALSE if there isn't enough space, or if the information cannot
229 TRUE if no check was done or there is enough space
233 receive_check_fs(int msg_size)
237 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
239 space = receive_statvfs(TRUE, &inodes);
242 debug_printf("spool directory space = %dK inodes = %d "
243 "check_space = %dK inodes = %d msg_size = %d\n",
244 space, inodes, check_spool_space, check_spool_inodes, msg_size);
246 if ((space >= 0 && space < check_spool_space) ||
247 (inodes >= 0 && inodes < check_spool_inodes))
249 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
250 "inodes=%d", space, inodes);
255 if (check_log_space > 0 || check_log_inodes > 0)
257 space = receive_statvfs(FALSE, &inodes);
260 debug_printf("log directory space = %dK inodes = %d "
261 "check_space = %dK inodes = %d\n",
262 space, inodes, check_log_space, check_log_inodes);
264 if ((space >= 0 && space < check_log_space) ||
265 (inodes >= 0 && inodes < check_log_inodes))
267 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
268 "inodes=%d", space, inodes);
278 /*************************************************
279 * Bomb out while reading a message *
280 *************************************************/
282 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
283 received, or if there is a timeout. A rarer case might be if the log files are
284 screwed up and Exim can't open them to record a message's arrival. Handling
285 that case is done by setting a flag to cause the log functions to call this
286 function if there is an ultimate disaster. That is why it is globally
290 reason text reason to pass to the not-quit ACL
291 msg default SMTP response to give if in an SMTP session
296 receive_bomb_out(uschar *reason, uschar *msg)
298 static BOOL already_bombing_out;
299 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
300 timeouts, if someone has something slow in their quit ACL. Since the only
301 things we should be doing are to close down cleanly ASAP, on the second
302 pass we also close down stuff that might be opened again, before bypassing
303 the ACL call and exiting. */
305 /* If spool_name is set, it contains the name of the data file that is being
306 written. Unlink it before closing so that it cannot be picked up by a delivery
307 process. Ensure that any header file is also removed. */
309 if (spool_name[0] != '\0')
312 spool_name[Ustrlen(spool_name) - 1] = 'H';
314 spool_name[0] = '\0';
317 /* Now close the file if it is open, either as a fd or a stream. */
319 if (data_file != NULL)
321 (void)fclose(data_file);
323 } else if (data_fd >= 0) {
324 (void)close(data_fd);
328 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
329 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
332 if (!already_bombing_out)
334 already_bombing_out = TRUE;
337 if (smtp_batched_input)
338 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
339 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
340 smtp_active_hostname, msg);
344 /* Exit from the program (non-BSMTP cases) */
346 exim_exit(EXIT_FAILURE, NULL);
350 /*************************************************
351 * Data read timeout *
352 *************************************************/
354 /* Handler function for timeouts that occur while reading the data that
357 Argument: the signal number
362 data_timeout_handler(int sig)
366 sig = sig; /* Keep picky compilers happy */
370 msg = US"SMTP incoming data timeout";
371 log_write(L_lost_incoming_connection,
372 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
374 (sender_fullhost != NULL)? sender_fullhost : US"local process",
379 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
380 log_write(L_lost_incoming_connection,
381 LOG_MAIN, "timed out while reading local message");
384 receive_bomb_out(US"data-timeout", msg); /* Does not return */
389 /*************************************************
390 * local_scan() timeout *
391 *************************************************/
393 /* Handler function for timeouts that occur while running a local_scan()
396 Argument: the signal number
401 local_scan_timeout_handler(int sig)
403 sig = sig; /* Keep picky compilers happy */
404 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
405 "message temporarily rejected (size %d)", message_size);
406 /* Does not return */
407 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
412 /*************************************************
413 * local_scan() crashed *
414 *************************************************/
416 /* Handler function for signals that occur while running a local_scan()
419 Argument: the signal number
424 local_scan_crash_handler(int sig)
426 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
427 "signal %d - message temporarily rejected (size %d)", sig, message_size);
428 /* Does not return */
429 receive_bomb_out(US"local-scan-error", US"local verification problem");
433 /*************************************************
434 * SIGTERM or SIGINT received *
435 *************************************************/
437 /* Handler for SIGTERM or SIGINT signals that occur while reading the
438 data that comprises a message.
440 Argument: the signal number
445 data_sigterm_sigint_handler(int sig)
451 msg = US"Service not available - SIGTERM or SIGINT received";
452 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
453 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
457 if (filter_test == FTEST_NONE)
459 fprintf(stderr, "\nexim: %s received - message abandoned\n",
460 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
461 log_write(0, LOG_MAIN, "%s received while reading local message",
462 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
466 receive_bomb_out(US"signal-exit", msg); /* Does not return */
471 /*************************************************
472 * Add new recipient to list *
473 *************************************************/
475 /* This function builds a list of recipient addresses in argc/argv
479 recipient the next address to add to recipients_list
480 pno parent number for fixed aliases; -1 otherwise
486 receive_add_recipient(uschar *recipient, int pno)
488 if (recipients_count >= recipients_list_max)
490 recipient_item *oldlist = recipients_list;
491 int oldmax = recipients_list_max;
492 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
493 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
495 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
498 recipients_list[recipients_count].address = recipient;
499 recipients_list[recipients_count].pno = pno;
500 #ifdef EXPERIMENTAL_BRIGHTMAIL
501 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
502 /* reset optin string pointer for next recipient */
503 bmi_current_optin = NULL;
505 recipients_list[recipients_count].orcpt = NULL;
506 recipients_list[recipients_count].dsn_flags = 0;
507 recipients_list[recipients_count++].errors_to = NULL;
513 /*************************************************
514 * Send user response message *
515 *************************************************/
517 /* This function is passed a default response code and a user message. It calls
518 smtp_message_code() to check and possibly modify the response code, and then
519 calls smtp_respond() to transmit the response. I put this into a function
520 just to avoid a lot of repetition.
523 code the response code
524 user_msg the user message
531 smtp_user_msg(uschar *code, uschar *user_msg)
534 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
535 smtp_respond(code, len, TRUE, user_msg);
543 /*************************************************
544 * Remove a recipient from the list *
545 *************************************************/
547 /* This function is provided for local_scan() to use.
550 recipient address to remove
552 Returns: TRUE if it did remove something; FALSE otherwise
556 receive_remove_recipient(uschar *recipient)
559 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
561 for (count = 0; count < recipients_count; count++)
563 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
565 if ((--recipients_count - count) > 0)
566 memmove(recipients_list + count, recipients_list + count + 1,
567 (recipients_count - count)*sizeof(recipient_item));
578 /*************************************************
579 * Read data portion of a non-SMTP message *
580 *************************************************/
582 /* This function is called to read the remainder of a message (following the
583 header) when the input is not from SMTP - we are receiving a local message on
584 a standard input stream. The message is always terminated by EOF, and is also
585 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
586 two cases for maximum efficiency.
588 Ensure that the body ends with a newline. This will naturally be the case when
589 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
590 as "sequences of lines" - this of course strictly applies only to SMTP, but
591 deliveries into BSD-type mailbox files also require it. Exim used to have a
592 flag for doing this at delivery time, but as it was always set for all
593 transports, I decided to simplify things by putting the check here instead.
595 There is at least one MUA (dtmail) that sends CRLF via this interface, and
596 other programs are known to do this as well. Exim used to have a option for
597 dealing with this: in July 2003, after much discussion, the code has been
598 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
600 However, for the case when a dot on a line by itself terminates a message, the
601 only recognized terminating sequences before and after the dot are LF and CRLF.
602 Otherwise, having read EOL . CR, you don't know whether to read another
605 Internally, in messages stored in Exim's spool files, LF is used as the line
606 terminator. Under the new regime, bare CRs will no longer appear in these
610 fout a FILE to which to write the message
612 Returns: One of the END_xxx values indicating why it stopped reading
616 read_message_data(FILE *fout)
620 register int linelength = 0;
622 /* Handle the case when only EOF terminates the message */
626 register int last_ch = '\n';
628 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
630 if (ch == 0) body_zerocount++;
631 if (last_ch == '\r' && ch != '\n')
633 if (linelength > max_received_linelength)
634 max_received_linelength = linelength;
636 if (fputc('\n', fout) == EOF) return END_WERROR;
640 if (ch == '\r') continue;
642 if (fputc(ch, fout) == EOF) return END_WERROR;
645 if (linelength > max_received_linelength)
646 max_received_linelength = linelength;
651 if (++message_size > thismessage_size_limit) return END_SIZE;
656 if (linelength > max_received_linelength)
657 max_received_linelength = linelength;
658 if (fputc('\n', fout) == EOF) return END_WERROR;
666 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
670 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
672 if (ch == 0) body_zerocount++;
675 case 0: /* Normal state (previous char written) */
679 if (linelength > max_received_linelength)
680 max_received_linelength = linelength;
685 { ch_state = 2; continue; }
688 case 1: /* After written "\n" */
689 if (ch == '.') { ch_state = 3; continue; }
690 if (ch == '\r') { ch_state = 2; continue; }
691 if (ch == '\n') { body_linecount++; linelength = -1; }
696 body_linecount++; /* After unwritten "\r" */
697 if (linelength > max_received_linelength)
698 max_received_linelength = linelength;
706 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
707 if (ch == '\r') continue;
713 case 3: /* After "\n." (\n written, dot not) */
714 if (ch == '\n') return END_DOT;
715 if (ch == '\r') { ch_state = 4; continue; }
718 if (fputc('.', fout) == EOF) return END_WERROR;
722 case 4: /* After "\n.\r" (\n written, rest not) */
723 if (ch == '\n') return END_DOT;
726 if (fputs(".\n", fout) == EOF) return END_WERROR;
727 if (ch == '\r') { ch_state = 2; continue; }
733 if (fputc(ch, fout) == EOF) return END_WERROR;
734 if (++message_size > thismessage_size_limit) return END_SIZE;
737 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
738 the message ends with a newline, and we must also write any characters that
739 were saved up while testing for an ending dot. */
743 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
744 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
745 message_size += Ustrlen(ends[ch_state]);
755 /*************************************************
756 * Read data portion of an SMTP message *
757 *************************************************/
759 /* This function is called to read the remainder of an SMTP message (after the
760 headers), or to skip over it when an error has occurred. In this case, the
761 output file is passed as NULL.
763 If any line begins with a dot, that character is skipped. The input should only
764 be successfully terminated by CR LF . CR LF unless it is local (non-network)
765 SMTP, in which case the CRs are optional, but...
767 FUDGE: It seems that sites on the net send out messages with just LF
768 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
769 we make the CRs optional in all cases.
771 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
772 well, so that there are no CRs in spooled messages. However, the message
773 terminating dot is not recognized between two bare CRs.
776 fout a FILE to which to write the message; NULL if skipping
778 Returns: One of the END_xxx values indicating why it stopped reading
782 read_message_data_smtp(FILE *fout)
788 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
790 if (ch == 0) body_zerocount++;
793 case 0: /* After LF or CRLF */
797 continue; /* Don't ever write . after LF */
801 /* Else fall through to handle as normal uschar. */
803 case 1: /* Normal state */
808 if (linelength > max_received_linelength)
809 max_received_linelength = linelength;
819 case 2: /* After (unwritten) CR */
821 if (linelength > max_received_linelength)
822 max_received_linelength = linelength;
831 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
832 cutthrough_data_put_nl();
833 if (ch != '\r') ch_state = 1; else continue;
837 case 3: /* After [CR] LF . */
845 /* The dot was removed at state 3. For a doubled dot, here, reinstate
846 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
847 and to file below. */
851 cutthrough_data_puts(&c, 1);
856 case 4: /* After [CR] LF . CR */
857 if (ch == '\n') return END_DOT;
860 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
861 cutthrough_data_put_nl();
871 /* Add the character to the spool file, unless skipping; then loop for the
878 if (fputc(ch, fout) == EOF) return END_WERROR;
879 if (message_size > thismessage_size_limit) return END_SIZE;
882 cutthrough_data_put_nl();
886 cutthrough_data_puts(&c, 1);
890 /* Fall through here if EOF encountered. This indicates some kind of error,
891 since a correct message is terminated by [CR] LF . [CR] LF. */
899 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
900 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
901 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
902 body_linecount accounting for proper re-expansion for the wire, so use
903 a cut-down version of the state-machine above; we don't need to do leading-dot
904 detection and unstuffing.
907 fout a FILE to which to write the message; NULL if skipping;
908 must be open for both writing and reading.
910 Returns: One of the END_xxx values indicating why it stopped reading
914 read_message_bdat_smtp(FILE *fout)
916 int linelength = 0, ch;
917 enum CH_STATE ch_state = LF_SEEN;
922 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
924 case EOF: return END_EOF;
925 case ERR: return END_PROTOCOL;
927 /* Nothing to get from the sender anymore. We check the last
928 character written to the spool.
930 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
931 If we would be strict, we would refuse such broken messages.
932 But we are liberal, so we fix it. It would be easy just to append
933 the "\n" to the spool.
935 But there are some more things (line counting, message size calculation and such),
936 that would need to be duplicated here. So we simply do some ungetc
941 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
942 if (fgetc(fout) == '\n') return END_DOT;
945 if (linelength == -1) /* \r already seen (see below) */
947 DEBUG(D_receive) debug_printf("Add missing LF\n");
951 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
952 bdat_ungetc('\r'); /* not even \r was seen */
956 case '\0': body_zerocount++; break;
960 case LF_SEEN: /* After LF or CRLF */
962 /* fall through to handle as normal uschar. */
964 case MID_LINE: /* Mid-line state */
969 if (linelength > max_received_linelength)
970 max_received_linelength = linelength;
976 if (fix_nl) bdat_ungetc('\n');
977 continue; /* don't write CR */
981 case CR_SEEN: /* After (unwritten) CR */
983 if (linelength > max_received_linelength)
984 max_received_linelength = linelength;
991 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
992 cutthrough_data_put_nl();
993 if (ch == '\r') continue; /* don't write CR */
999 /* Add the character to the spool file, unless skipping */
1005 if (fputc(ch, fout) == EOF) return END_WERROR;
1006 if (message_size > thismessage_size_limit) return END_SIZE;
1009 cutthrough_data_put_nl();
1013 cutthrough_data_puts(&c, 1);
1020 read_message_bdat_smtp_wire(FILE *fout)
1024 /* Remember that this message uses wireformat. */
1026 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1027 fout ? "writing spoolfile in wire format" : "flushing input");
1028 spool_file_wireformat = TRUE;
1032 if (chunking_data_left > 0)
1034 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1035 uschar * buf = bdat_getbuf(&len);
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.fd >= 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)");
1232 if (last_received == NULL)
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 != NULL &&
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 != NULL) &&
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;
1267 if (h->next == NULL) header_last = h;
1269 /* Check for one of the known header types (From:, To:, etc.) though in
1270 practice most added headers are going to be "other". Lower case
1271 identification letters are never stored with the header; they are used
1272 for existence tests when messages are received. So discard any lower case
1275 h->type = header_checkname(h, FALSE);
1276 if (h->type >= 'a') h->type = htype_other;
1278 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", header_last->text);
1281 acl_added_headers = NULL;
1282 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1287 /*************************************************
1288 * Add host information for log line *
1289 *************************************************/
1291 /* Called for acceptance and rejecting log lines. This adds information about
1292 the calling host to a string that is being built dynamically.
1295 s the dynamic string
1297 Returns: the extended string
1301 add_host_info_for_log(gstring * g)
1303 if (sender_fullhost)
1305 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1306 g = string_catn(g, US" DS", 3);
1307 g = string_append(g, 2, US" H=", sender_fullhost);
1308 if (LOGGING(incoming_interface) && interface_address != NULL)
1311 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1314 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1316 g = string_catn(g, US" TFO", 4);
1317 tcp_in_fastopen_logged = TRUE;
1320 g = string_append(g, 2, US" U=", sender_ident);
1321 if (received_protocol)
1322 g = string_append(g, 2, US" P=", received_protocol);
1328 #ifdef WITH_CONTENT_SCAN
1330 /*************************************************
1331 * Run the MIME ACL on a message *
1332 *************************************************/
1334 /* This code is in a subroutine so that it can be used for both SMTP
1335 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1338 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1339 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1340 smtp_reply_ptr Where SMTP reply is being built
1341 blackholed_by_ptr Where "blackholed by" message is being built
1343 Returns: TRUE to carry on; FALSE to abandon the message
1347 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1348 uschar **blackholed_by_ptr)
1351 uschar * rfc822_file_path = NULL;
1352 unsigned long mbox_size;
1353 header_line *my_headerlist;
1354 uschar *user_msg, *log_msg;
1355 int mime_part_count_buffer = -1;
1356 uschar * mbox_filename;
1359 /* check if it is a MIME message */
1361 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1362 if ( my_headerlist->type != '*' /* skip deleted headers */
1363 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1366 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1370 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1375 /* make sure the eml mbox file is spooled up */
1376 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1377 { /* error while spooling */
1378 log_write(0, LOG_MAIN|LOG_PANIC,
1379 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1380 Uunlink(spool_name);
1382 #ifdef EXPERIMENTAL_DCC
1385 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1386 message_id[0] = 0; /* Indicate no message accepted */
1387 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1388 return FALSE; /* Indicate skip to end of receive function */
1394 mime_part_count = -1;
1395 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1396 (void)fclose(mbox_file);
1398 if (rfc822_file_path)
1400 mime_part_count = mime_part_count_buffer;
1402 if (unlink(CS rfc822_file_path) == -1)
1404 log_write(0, LOG_PANIC,
1405 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1408 rfc822_file_path = NULL;
1411 /* check if we must check any message/rfc822 attachments */
1414 uschar * scandir = string_copyn(mbox_filename,
1415 Ustrrchr(mbox_filename, '/') - mbox_filename);
1416 struct dirent * entry;
1419 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1420 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1422 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1424 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1430 if (rfc822_file_path)
1432 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1434 /* set RFC822 expansion variable */
1436 mime_part_count_buffer = mime_part_count;
1437 goto MIME_ACL_CHECK;
1439 log_write(0, LOG_PANIC,
1440 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1441 unlink(CS rfc822_file_path);
1446 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1449 recipients_count = 0;
1450 *blackholed_by_ptr = US"MIME ACL";
1454 Uunlink(spool_name);
1456 #ifdef EXPERIMENTAL_DCC
1461 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1462 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1463 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1465 message_id[0] = 0; /* Indicate no message accepted */
1466 return FALSE; /* Cause skip to end of receive function */
1472 #endif /* WITH_CONTENT_SCAN */
1477 received_header_gen(void)
1481 header_line *received_header= header_list;
1483 timestamp = expand_string(US"${tod_full}");
1484 if (recipients_count == 1) received_for = recipients_list[0].address;
1485 received = expand_string(received_header_text);
1486 received_for = NULL;
1490 if(spool_name[0] != 0)
1491 Uunlink(spool_name); /* Lose the data file */
1492 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1493 "(received_header_text) failed: %s", string_printing(received_header_text),
1494 expand_string_message);
1497 /* The first element on the header chain is reserved for the Received header,
1498 so all we have to do is fill in the text pointer, and set the type. However, if
1499 the result of the expansion is an empty string, we leave the header marked as
1500 "old" so as to refrain from adding a Received header. */
1502 if (received[0] == 0)
1504 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1505 received_header->type = htype_old;
1509 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1510 received_header->type = htype_received;
1513 received_header->slen = Ustrlen(received_header->text);
1515 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1516 received_header->type, received_header->text);
1521 /*************************************************
1523 *************************************************/
1525 /* Receive a message on the given input, and put it into a pair of spool files.
1526 Either a non-null list of recipients, or the extract flag will be true, or
1527 both. The flag sender_local is true for locally generated messages. The flag
1528 submission_mode is true if an ACL has obeyed "control = submission". The flag
1529 suppress_local_fixups is true if an ACL has obeyed "control =
1530 suppress_local_fixups" or -G was passed on the command-line.
1531 The flag smtp_input is true if the message is to be
1532 handled using SMTP conventions about termination and lines starting with dots.
1533 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1535 If a message was successfully read, message_id[0] will be non-zero.
1537 The general actions of this function are:
1539 . Read the headers of the message (if any) into a chain of store
1542 . If there is a "sender:" header and the message is locally originated,
1543 throw it away, unless the caller is trusted, or unless
1544 active_local_sender_retain is set - which can only happen if
1545 active_local_from_check is false.
1547 . If recipients are to be extracted from the message, build the
1548 recipients list from the headers, removing any that were on the
1549 original recipients list (unless extract_addresses_remove_arguments is
1550 false), and at the same time, remove any bcc header that may be present.
1552 . Get the spool file for the data, sort out its unique name, open
1553 and lock it (but don't give it the name yet).
1555 . Generate a "Message-Id" header if the message doesn't have one, for
1556 locally-originated messages.
1558 . Generate a "Received" header.
1560 . Ensure the recipients list is fully qualified and rewritten if necessary.
1562 . If there are any rewriting rules, apply them to the sender address
1563 and also to the headers.
1565 . If there is no from: header, generate one, for locally-generated messages
1566 and messages in "submission mode" only.
1568 . If the sender is local, check that from: is correct, and if not, generate
1569 a Sender: header, unless message comes from a trusted caller, or this
1570 feature is disabled by active_local_from_check being false.
1572 . If there is no "date" header, generate one, for locally-originated
1573 or submission mode messages only.
1575 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1576 dot_ends mode, to the data file. Leave it open, to hold the lock.
1578 . Write the envelope and the headers to a new file.
1580 . Set the name for the header file; close it.
1582 . Set the name for the data file; close it.
1584 Because this function can potentially be called many times in a single
1585 SMTP connection, all store should be got by store_get(), so that it will be
1586 automatically retrieved after the message is accepted.
1588 FUDGE: It seems that sites on the net send out messages with just LF
1589 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1590 we make the CRs optional in all cases.
1592 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1593 new regime is now in place in which bare CRs in header lines are turned into LF
1594 followed by a space, so as not to terminate the header line.
1596 February 2004: A bare LF in a header line in a message whose first line was
1597 terminated by CRLF is treated in the same way as a bare CR.
1600 extract_recip TRUE if recipients are to be extracted from the message's
1603 Returns: TRUE there are more messages to be read (SMTP input)
1604 FALSE there are no more messages to be read (non-SMTP input
1605 or SMTP connection collapsed, or other failure)
1607 When reading a message for filter testing, the returned value indicates
1608 whether the headers (which is all that is read) were terminated by '.' or
1612 receive_msg(BOOL extract_recip)
1617 int process_info_len = Ustrlen(process_info);
1618 int error_rc = (error_handling == ERRORS_SENDER)?
1619 errors_sender_rc : EXIT_FAILURE;
1620 int header_size = 256;
1621 int start, end, domain;
1624 int prevlines_length = 0;
1626 register int ptr = 0;
1628 BOOL contains_resent_headers = FALSE;
1629 BOOL extracted_ignored = FALSE;
1630 BOOL first_line_ended_crlf = TRUE_UNSET;
1631 BOOL smtp_yield = TRUE;
1634 BOOL resents_exist = FALSE;
1635 uschar *resent_prefix = US"";
1636 uschar *blackholed_by = NULL;
1637 uschar *blackhole_log_msg = US"";
1638 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1641 error_block *bad_addresses = NULL;
1643 uschar *frozen_by = NULL;
1644 uschar *queued_by = NULL;
1648 struct stat statbuf;
1650 /* Final message to give to SMTP caller, and messages from ACLs */
1652 uschar *smtp_reply = NULL;
1653 uschar *user_msg, *log_msg;
1655 /* Working header pointers */
1657 header_line *h, *next;
1659 /* Flags for noting the existence of certain headers (only one left) */
1661 BOOL date_header_exists = FALSE;
1663 /* Pointers to receive the addresses of headers whose contents we need. */
1665 header_line *from_header = NULL;
1666 header_line *subject_header = NULL;
1667 header_line *msgid_header = NULL;
1668 header_line *received_header;
1670 #ifdef EXPERIMENTAL_DMARC
1672 #endif /* EXPERIMENTAL_DMARC */
1674 /* Variables for use when building the Received: header. */
1679 /* Release any open files that might have been cached while preparing to
1680 accept the message - e.g. by verifying addresses - because reading a message
1681 might take a fair bit of real time. */
1685 /* Extracting the recipient list from an input file is incompatible with
1686 cutthrough delivery with the no-spool option. It shouldn't be possible
1687 to set up the combination, but just in case kill any ongoing connection. */
1688 if (extract_recip || !smtp_input)
1689 cancel_cutthrough_connection(TRUE, US"not smtp input");
1691 /* Initialize the chain of headers by setting up a place-holder for Received:
1692 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1693 pointing to the end of the chain to make adding headers simple. */
1695 received_header = header_list = header_last = store_get(sizeof(header_line));
1696 header_list->next = NULL;
1697 header_list->type = htype_old;
1698 header_list->text = NULL;
1699 header_list->slen = 0;
1701 /* Control block for the next header to be read. */
1703 next = store_get(sizeof(header_line));
1704 next->text = store_get(header_size);
1706 /* Initialize message id to be null (indicating no message read), and the
1707 header names list to be the normal list. Indicate there is no data file open
1708 yet, initialize the size and warning count, and deal with no size limit. */
1716 received_count = 1; /* For the one we will add */
1718 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1720 /* While reading the message, the following counts are computed. */
1722 message_linecount = body_linecount = body_zerocount =
1723 max_received_linelength = 0;
1725 #ifndef DISABLE_DKIM
1726 /* Call into DKIM to set up the context. In CHUNKING mode
1727 we clear the dot-stuffing flag */
1728 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1729 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1732 #ifdef EXPERIMENTAL_DMARC
1733 /* initialize libopendmarc */
1734 dmarc_up = dmarc_init();
1737 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1738 ids, and fractions of a second are required. See the comments that precede the
1739 message id creation below. */
1741 (void)gettimeofday(&message_id_tv, NULL);
1743 /* For other uses of the received time we can operate with granularity of one
1744 second, and for that we use the global variable received_time. This is for
1745 things like ultimate message timeouts.XXX */
1747 received_time = message_id_tv;
1749 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1750 happen in the smtp_getc() function when it refills its buffer. */
1752 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1754 /* If not SMTP input, timeout happens only if configured, and we just set a
1755 single timeout for the whole message. */
1757 else if (receive_timeout > 0)
1759 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1760 alarm(receive_timeout);
1763 /* SIGTERM and SIGINT are caught always. */
1765 signal(SIGTERM, data_sigterm_sigint_handler);
1766 signal(SIGINT, data_sigterm_sigint_handler);
1768 /* Header lines in messages are not supposed to be very long, though when
1769 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1770 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1771 storing the header, and extend this as necessary using string_cat().
1773 To cope with total lunacies, impose an upper limit on the length of the header
1774 section of the message, as otherwise the store will fill up. We must also cope
1775 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1776 Folded header lines are joined into one string, leaving the '\n' characters
1777 inside them, so that writing them out reproduces the input.
1779 Loop for each character of each header; the next structure for chaining the
1780 header is set up already, with ptr the offset of the next character in
1785 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1787 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1788 SMTP must have a correct "." terminator. */
1790 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1792 smtp_reply = handle_lost_connection(US" (header)");
1794 goto TIDYUP; /* Skip to end of function */
1797 /* See if we are at the current header's size limit - there must be at least
1798 four bytes left. This allows for the new character plus a zero, plus two for
1799 extra insertions when we are playing games with dots and carriage returns. If
1800 we are at the limit, extend the text buffer. This could have been done
1801 automatically using string_cat() but because this is a tightish loop storing
1802 only one character at a time, we choose to do it inline. Normally
1803 store_extend() will be able to extend the block; only at the end of a big
1804 store block will a copy be needed. To handle the case of very long headers
1805 (and sometimes lunatic messages can have ones that are 100s of K long) we
1806 call store_release() for strings that have been copied - if the string is at
1807 the start of a block (and therefore the only thing in it, because we aren't
1808 doing any other gets), the block gets freed. We can only do this release if
1809 there were no allocations since the once that we want to free. */
1811 if (ptr >= header_size - 4)
1813 int oldsize = header_size;
1814 /* header_size += 256; */
1816 if (!store_extend(next->text, oldsize, header_size))
1818 BOOL release_ok = store_last_get[store_pool] == next->text;
1819 uschar *newtext = store_get(header_size);
1820 memcpy(newtext, next->text, ptr);
1821 if (release_ok) store_release(next->text);
1822 next->text = newtext;
1826 /* Cope with receiving a binary zero. There is dispute about whether
1827 these should be allowed in RFC 822 messages. The middle view is that they
1828 should not be allowed in headers, at least. Exim takes this attitude at
1829 the moment. We can't just stomp on them here, because we don't know that
1830 this line is a header yet. Set a flag to cause scanning later. */
1832 if (ch == 0) had_zero++;
1834 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1835 those from data files use just LF. Treat LF in local SMTP input as a
1836 terminator too. Treat EOF as a line terminator always. */
1838 if (ch == EOF) goto EOL;
1840 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1841 other MTAs accept this. We are therefore forced into this "liberalisation"
1842 too, so we accept LF as a line terminator whatever the source of the message.
1843 However, if the first line of the message ended with a CRLF, we treat a bare
1844 LF specially by inserting a white space after it to ensure that the header
1845 line is not terminated. */
1849 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1850 else if (first_line_ended_crlf) receive_ungetc(' ');
1854 /* This is not the end of the line. If this is SMTP input and this is
1855 the first character in the line and it is a "." character, ignore it.
1856 This implements the dot-doubling rule, though header lines starting with
1857 dots aren't exactly common. They are legal in RFC 822, though. If the
1858 following is CRLF or LF, this is the line that that terminates the
1859 entire message. We set message_ended to indicate this has happened (to
1860 prevent further reading), and break out of the loop, having freed the
1861 empty header, and set next = NULL to indicate no data line. */
1863 if (ptr == 0 && ch == '.' && dot_ends)
1865 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1868 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1872 ch = '\r'; /* Revert to CR */
1877 message_ended = END_DOT;
1880 break; /* End character-reading loop */
1883 /* For non-SMTP input, the dot at the start of the line was really a data
1884 character. What is now in ch is the following character. We guaranteed
1885 enough space for this above. */
1889 next->text[ptr++] = '.';
1894 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1895 remember this case if this is the first line ending. */
1899 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1902 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1906 /* Otherwise, put back the character after CR, and turn the bare CR
1909 ch = (receive_ungetc)(ch);
1910 next->text[ptr++] = '\n';
1915 /* We have a data character for the header line. */
1917 next->text[ptr++] = ch; /* Add to buffer */
1918 message_size++; /* Total message size so far */
1920 /* Handle failure due to a humungously long header section. The >= allows
1921 for the terminating \n. Add what we have so far onto the headers list so
1922 that it gets reflected in any error message, and back up the just-read
1925 if (message_size >= header_maxsize)
1927 next->text[ptr] = 0;
1929 next->type = htype_other;
1931 header_last->next = next;
1934 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1935 "%s (more than %d characters): message abandoned",
1936 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1940 smtp_reply = US"552 Message header is ridiculously long";
1941 receive_swallow_smtp();
1942 goto TIDYUP; /* Skip to end of function */
1947 give_local_error(ERRMESS_VLONGHEADER,
1948 string_sprintf("message header longer than %d characters received: "
1949 "message not accepted", header_maxsize), US"", error_rc, stdin,
1951 /* Does not return */
1955 continue; /* With next input character */
1957 /* End of header line reached */
1961 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1963 receive_linecount++;
1964 message_linecount++;
1966 /* Keep track of maximum line length */
1968 if (ptr - prevlines_length > max_received_linelength)
1969 max_received_linelength = ptr - prevlines_length;
1970 prevlines_length = ptr + 1;
1972 /* Now put in the terminating newline. There is always space for
1973 at least two more characters. */
1975 next->text[ptr++] = '\n';
1978 /* A blank line signals the end of the headers; release the unwanted
1979 space and set next to NULL to indicate this. */
1988 /* There is data in the line; see if the next input character is a
1989 whitespace character. If it is, we have a continuation of this header line.
1990 There is always space for at least one character at this point. */
1994 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1995 if (nextch == ' ' || nextch == '\t')
1997 next->text[ptr++] = nextch;
1999 continue; /* Iterate the loop */
2001 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2002 else ch = EOF; /* Cause main loop to exit at end */
2005 /* We have got to the real line end. Terminate the string and release store
2006 beyond it. If it turns out to be a real header, internal binary zeros will
2007 be squashed later. */
2009 next->text[ptr] = 0;
2011 store_reset(next->text + ptr + 1);
2013 /* Check the running total size against the overall message size limit. We
2014 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2015 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2016 headers - the code to read the body will then also hit the buffer. */
2018 if (message_size > thismessage_size_limit) break;
2020 /* A line that is not syntactically correct for a header also marks
2021 the end of the headers. In this case, we leave next containing the
2022 first data line. This might actually be several lines because of the
2023 continuation logic applied above, but that doesn't matter.
2025 It turns out that smail, and presumably sendmail, accept leading lines
2028 From ph10 Fri Jan 5 12:35 GMT 1996
2030 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2031 find any documentation of this, but for compatibility it had better be
2032 accepted. Exim restricts it to the case of non-smtp messages, and
2033 treats it as an alternative to the -f command line option. Thus it is
2034 ignored except for trusted users or filter testing. Otherwise it is taken
2035 as the sender address, unless -f was used (sendmail compatibility).
2037 It further turns out that some UUCPs generate the From_line in a different
2040 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2042 The regex for matching these things is now capable of recognizing both
2043 formats (including 2- and 4-digit years in the latter). In fact, the regex
2044 is now configurable, as is the expansion string to fish out the sender.
2046 Even further on it has been discovered that some broken clients send
2047 these lines in SMTP messages. There is now an option to ignore them from
2048 specified hosts or networks. Sigh. */
2050 if ( header_last == header_list
2052 || ( sender_host_address
2053 && verify_check_host(&ignore_fromline_hosts) == OK
2055 || (!sender_host_address && ignore_fromline_local)
2057 && regex_match_and_setup(regex_From, next->text, 0, -1)
2060 if (!sender_address_forced)
2062 uschar *uucp_sender = expand_string(uucp_from_sender);
2064 log_write(0, LOG_MAIN|LOG_PANIC,
2065 "expansion of \"%s\" failed after matching "
2066 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2069 int start, end, domain;
2071 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2072 &start, &end, &domain, TRUE);
2075 if (domain == 0 && newsender[0] != 0)
2076 newsender = rewrite_address_qualify(newsender, FALSE);
2078 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2080 sender_address = newsender;
2082 if (trusted_caller || filter_test != FTEST_NONE)
2084 authenticated_sender = NULL;
2085 originator_name = US"";
2086 sender_local = FALSE;
2089 if (filter_test != FTEST_NONE)
2090 printf("Sender taken from \"From \" line\n");
2097 /* Not a leading "From " line. Check to see if it is a valid header line.
2098 Header names may contain any non-control characters except space and colon,
2103 uschar *p = next->text;
2105 /* If not a valid header line, break from the header reading loop, leaving
2106 next != NULL, indicating that it holds the first line of the body. */
2108 if (isspace(*p)) break;
2109 while (mac_isgraph(*p) && *p != ':') p++;
2110 while (isspace(*p)) p++;
2113 body_zerocount = had_zero;
2117 /* We have a valid header line. If there were any binary zeroes in
2118 the line, stomp on them here. */
2121 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2123 /* It is perfectly legal to have an empty continuation line
2124 at the end of a header, but it is confusing to humans
2125 looking at such messages, since it looks like a blank line.
2126 Reduce confusion by removing redundant white space at the
2127 end. We know that there is at least one printing character
2128 (the ':' tested for above) so there is no danger of running
2131 p = next->text + ptr - 2;
2134 while (*p == ' ' || *p == '\t') p--;
2135 if (*p != '\n') break;
2136 ptr = (p--) - next->text + 1;
2137 message_size -= next->slen - ptr;
2138 next->text[ptr] = 0;
2142 /* Add the header to the chain */
2144 next->type = htype_other;
2146 header_last->next = next;
2149 /* Check the limit for individual line lengths. This comes after adding to
2150 the chain so that the failing line is reflected if a bounce is generated
2151 (for a local message). */
2153 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2155 log_write(0, LOG_MAIN, "overlong message header line received from "
2156 "%s (more than %d characters): message abandoned",
2157 sender_host_unknown? sender_ident : sender_fullhost,
2158 header_line_maxsize);
2162 smtp_reply = US"552 A message header line is too long";
2163 receive_swallow_smtp();
2164 goto TIDYUP; /* Skip to end of function */
2168 give_local_error(ERRMESS_VLONGHDRLINE,
2169 string_sprintf("message header line longer than %d characters "
2170 "received: message not accepted", header_line_maxsize), US"",
2171 error_rc, stdin, header_list->next);
2172 /* Does not return */
2175 /* Note if any resent- fields exist. */
2177 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2179 resents_exist = TRUE;
2180 resent_prefix = US"Resent-";
2184 /* Reject CHUNKING messages that do not CRLF their first header line */
2186 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2188 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2189 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2191 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2192 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2193 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2196 goto TIDYUP; /* Skip to end of function */
2199 /* The line has been handled. If we have hit EOF, break out of the loop,
2200 indicating no pending data line. */
2202 if (ch == EOF) { next = NULL; break; }
2204 /* Set up for the next header */
2207 next = store_get(sizeof(header_line));
2208 next->text = store_get(header_size);
2211 prevlines_length = 0;
2212 } /* Continue, starting to read the next header */
2214 /* At this point, we have read all the headers into a data structure in main
2215 store. The first header is still the dummy placeholder for the Received: header
2216 we are going to generate a bit later on. If next != NULL, it contains the first
2217 data line - which terminated the headers before reaching a blank line (not the
2222 debug_printf(">>Headers received:\n");
2223 for (h = header_list->next; h; h = h->next)
2224 debug_printf("%s", h->text);
2228 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2229 is dropped immediately after valid headers, the next thing we will see is EOF.
2230 We must test for this specially, as further down the reading of the data is
2231 skipped if already at EOF. */
2233 if (smtp_input && (receive_feof)())
2235 smtp_reply = handle_lost_connection(US" (after header)");
2237 goto TIDYUP; /* Skip to end of function */
2240 /* If this is a filter test run and no headers were read, output a warning
2241 in case there is a mistake in the test message. */
2243 if (filter_test != FTEST_NONE && header_list->next == NULL)
2244 printf("Warning: no message headers read\n");
2247 /* Scan the headers to identify them. Some are merely marked for later
2248 processing; some are dealt with here. */
2250 for (h = header_list->next; h; h = h->next)
2252 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2253 if (is_resent) contains_resent_headers = TRUE;
2255 switch (header_checkname(h, is_resent))
2258 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2262 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2265 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2268 if (!resents_exist || is_resent) date_header_exists = TRUE;
2271 /* Same comments as about Return-Path: below. */
2273 case htype_delivery_date:
2274 if (delivery_date_remove) h->type = htype_old;
2277 /* Same comments as about Return-Path: below. */
2279 case htype_envelope_to:
2280 if (envelope_to_remove) h->type = htype_old;
2283 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2284 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2285 header consists of just the login id of the user who called Exim, rewrite
2286 it with the gecos field first. Apply this rule to Resent-From: if there
2287 are resent- fields. */
2290 h->type = htype_from;
2291 if (!resents_exist || is_resent)
2297 uschar *s = Ustrchr(h->text, ':') + 1;
2298 while (isspace(*s)) s++;
2299 len = h->slen - (s - h->text) - 1;
2300 if (Ustrlen(originator_login) == len &&
2301 strncmpic(s, originator_login, len) == 0)
2303 uschar *name = is_resent? US"Resent-From" : US"From";
2304 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2305 originator_login, qualify_domain_sender);
2306 from_header = header_last;
2307 h->type = htype_old;
2308 DEBUG(D_receive|D_rewrite)
2309 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2315 /* Identify the Message-id: header for generating "in-reply-to" in the
2316 autoreply transport. For incoming logging, save any resent- value. In both
2317 cases, take just the first of any multiples. */
2320 if (msgid_header == NULL && (!resents_exist || is_resent))
2327 /* Flag all Received: headers */
2329 case htype_received:
2330 h->type = htype_received;
2334 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2336 case htype_reply_to:
2337 h->type = htype_reply_to;
2340 /* The Return-path: header is supposed to be added to messages when
2341 they leave the SMTP system. We shouldn't receive messages that already
2342 contain Return-path. However, since Exim generates Return-path: on
2343 local delivery, resent messages may well contain it. We therefore
2344 provide an option (which defaults on) to remove any Return-path: headers
2345 on input. Removal actually means flagging as "old", which prevents the
2346 header being transmitted with the message. */
2348 case htype_return_path:
2349 if (return_path_remove) h->type = htype_old;
2351 /* If we are testing a mail filter file, use the value of the
2352 Return-Path: header to set up the return_path variable, which is not
2353 otherwise set. However, remove any <> that surround the address
2354 because the variable doesn't have these. */
2356 if (filter_test != FTEST_NONE)
2358 uschar *start = h->text + 12;
2359 uschar *end = start + Ustrlen(start);
2360 while (isspace(*start)) start++;
2361 while (end > start && isspace(end[-1])) end--;
2362 if (*start == '<' && end[-1] == '>')
2367 return_path = string_copyn(start, end - start);
2368 printf("Return-path taken from \"Return-path:\" header line\n");
2372 /* If there is a "Sender:" header and the message is locally originated,
2373 and from an untrusted caller and suppress_local_fixups is not set, or if we
2374 are in submission mode for a remote message, mark it "old" so that it will
2375 not be transmitted with the message, unless active_local_sender_retain is
2376 set. (This can only be true if active_local_from_check is false.) If there
2377 are any resent- headers in the message, apply this rule to Resent-Sender:
2378 instead of Sender:. Messages with multiple resent- header sets cannot be
2379 tidily handled. (For this reason, at least one MUA - Pine - turns old
2380 resent- headers into X-resent- headers when resending, leaving just one
2384 h->type = ((!active_local_sender_retain &&
2386 (sender_local && !trusted_caller && !suppress_local_fixups)
2390 (!resents_exist||is_resent))?
2391 htype_old : htype_sender;
2394 /* Remember the Subject: header for logging. There is no Resent-Subject */
2400 /* "To:" gets flagged, and the existence of a recipient header is noted,
2401 whether it's resent- or not. */
2406 to_or_cc_header_exists = TRUE;
2412 /* Extract recipients from the headers if that is required (the -t option).
2413 Note that this is documented as being done *before* any address rewriting takes
2414 place. There are two possibilities:
2416 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2417 recipients already listed are to be REMOVED from the message. Smail 3 works
2418 like this. We need to build a non-recipients tree for that list, because in
2419 subsequent processing this data is held in a tree and that's what the
2420 spool_write_header() function expects. Make sure that non-recipient addresses
2421 are fully qualified and rewritten if necessary.
2423 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2424 those in the command line arguments (and it is rumoured some other MTAs do
2425 this). Therefore, there is an option to make Exim behave this way.
2427 *** Notes on "Resent-" header lines ***
2429 The presence of resent-headers in the message makes -t horribly ambiguous.
2430 Experiments with sendmail showed that it uses recipients for all resent-
2431 headers, totally ignoring the concept of "sets of resent- headers" as described
2432 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2433 with all the addresses in one instance of each header.
2435 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2436 error for -t if there were resent- headers in the message. However, after a
2437 discussion on the mailing list, I've learned that there are MUAs that use
2438 resent- headers with -t, and also that the stuff about sets of resent- headers
2439 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2440 message with -t and resent- header lines makes sure that only *its* resent-
2441 headers are present; previous ones are often renamed as X-resent- for example.
2443 Consequently, Exim has been changed so that, if any resent- header lines are
2444 present, the recipients are taken from all of the appropriate resent- lines,
2445 and not from the ordinary To:, Cc:, etc. */
2450 error_block **bnext = &bad_addresses;
2452 if (extract_addresses_remove_arguments)
2454 while (recipients_count-- > 0)
2456 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2457 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2458 tree_add_nonrecipient(s);
2460 recipients_list = NULL;
2461 recipients_count = recipients_list_max = 0;
2464 /* Now scan the headers */
2466 for (h = header_list->next; h; h = h->next)
2468 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2469 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2471 uschar *s = Ustrchr(h->text, ':') + 1;
2472 while (isspace(*s)) s++;
2474 parse_allow_group = TRUE; /* Allow address group syntax */
2478 uschar *ss = parse_find_address_end(s, FALSE);
2479 uschar *recipient, *errmess, *p, *pp;
2480 int start, end, domain;
2482 /* Check on maximum */
2484 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 */
2491 /* Make a copy of the address, and remove any internal newlines. These
2492 may be present as a result of continuations of the header line. The
2493 white space that follows the newline must not be removed - it is part
2496 pp = recipient = store_get(ss - s + 1);
2497 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2502 BOOL b = allow_utf8_domains;
2503 allow_utf8_domains = TRUE;
2505 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2509 if (string_is_utf8(recipient))
2510 message_smtputf8 = TRUE;
2512 allow_utf8_domains = b;
2516 /* Keep a list of all the bad addresses so we can send a single
2517 error message at the end. However, an empty address is not an error;
2518 just ignore it. This can come from an empty group list like
2520 To: Recipients of list:;
2522 If there are no recipients at all, an error will occur later. */
2524 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2526 int len = Ustrlen(s);
2527 error_block *b = store_get(sizeof(error_block));
2528 while (len > 0 && isspace(s[len-1])) len--;
2530 b->text1 = string_printing(string_copyn(s, len));
2536 /* If the recipient is already in the nonrecipients tree, it must
2537 have appeared on the command line with the option extract_addresses_
2538 remove_arguments set. Do not add it to the recipients, and keep a note
2539 that this has happened, in order to give a better error if there are
2540 no recipients left. */
2542 else if (recipient != NULL)
2544 if (tree_search(tree_nonrecipients, recipient) == NULL)
2545 receive_add_recipient(recipient, -1);
2547 extracted_ignored = TRUE;
2550 /* Move on past this address */
2552 s = ss + (*ss? 1:0);
2553 while (isspace(*s)) s++;
2554 } /* Next address */
2556 parse_allow_group = FALSE; /* Reset group syntax flags */
2557 parse_found_group = FALSE;
2559 /* If this was the bcc: header, mark it "old", which means it
2560 will be kept on the spool, but not transmitted as part of the
2563 if (h->type == htype_bcc) h->type = htype_old;
2564 } /* For appropriate header line */
2565 } /* For each header line */
2569 /* Now build the unique message id. This has changed several times over the
2570 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2571 Retaining all the history in the comment has become too unwieldy - read
2572 previous release sources if you want it.
2574 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2575 The first part is the current time, in seconds. The second part is the current
2576 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2577 can hold a number in the range 0-3843. It used to be a computed sequence
2578 number, but is now the fractional component of the current time in units of
2579 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2580 received, Exim ensures that the timer has ticked at the appropriate level
2581 before proceeding, to avoid duplication if the pid happened to be re-used
2582 within the same time period. It seems likely that most messages will take at
2583 least half a millisecond to be received, so no delay will normally be
2584 necessary. At least for some time...
2586 There is a modification when localhost_number is set. Formerly this was allowed
2587 to be as large as 255. Now it is restricted to the range 0-16, and the final
2588 component of the message id becomes (localhost_number * 200) + fractional time
2589 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2591 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2592 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2593 still allows the tttttt field to hold a large enough number to last for some
2594 more decades, and the final two-digit field can hold numbers up to 1295, which
2595 is enough for milliseconds (instead of 1/2000 of a second).
2597 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2598 pid, so it is probably safe because pids have to be positive. The
2599 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2600 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2602 Note that string_base62() returns its data in a static storage block, so it
2603 must be copied before calling string_base62() again. It always returns exactly
2606 There doesn't seem to be anything in the RFC which requires a message id to
2607 start with a letter, but Smail was changed to ensure this. The external form of
2608 the message id (as supplied by string expansion) therefore starts with an
2609 additional leading 'E'. The spool file names do not include this leading
2610 letter and it is not used internally.
2612 NOTE: If ever the format of message ids is changed, the regular expression for
2613 checking that a string is in this format must be updated in a corresponding
2614 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2615 must also be changed to reflect the correct string length. The queue-sort code
2616 needs to know the layout. Then, of course, other programs that rely on the
2617 message id format will need updating too. */
2619 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2620 message_id[6] = '-';
2621 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2623 /* Deal with the case where the host number is set. The value of the number was
2624 checked when it was read, to ensure it isn't too big. The timing granularity is
2625 left in id_resolution so that an appropriate wait can be done after receiving
2626 the message, if necessary (we hope it won't be). */
2628 if (host_number_string != NULL)
2630 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2631 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2632 string_base62((long int)(
2633 host_number * (1000000/id_resolution) +
2634 message_id_tv.tv_usec/id_resolution)) + 4);
2637 /* Host number not set: final field is just the fractional time at an
2638 appropriate resolution. */
2642 id_resolution = (BASE_62 == 62)? 500 : 1000;
2643 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2644 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2647 /* Add the current message id onto the current process info string if
2650 (void)string_format(process_info + process_info_len,
2651 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2653 /* If we are using multiple input directories, set up the one for this message
2654 to be the least significant base-62 digit of the time of arrival. Otherwise
2655 ensure that it is an empty string. */
2657 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2659 /* Now that we have the message-id, if there is no message-id: header, generate
2660 one, but only for local (without suppress_local_fixups) or submission mode
2661 messages. This can be user-configured if required, but we had better flatten
2662 any illegal characters therein. */
2664 if (msgid_header == NULL &&
2665 ((sender_host_address == NULL && !suppress_local_fixups)
2666 || submission_mode))
2669 uschar *id_text = US"";
2670 uschar *id_domain = primary_hostname;
2672 /* Permit only letters, digits, dots, and hyphens in the domain */
2674 if (message_id_domain != NULL)
2676 uschar *new_id_domain = expand_string(message_id_domain);
2677 if (new_id_domain == NULL)
2679 if (!expand_string_forcedfail)
2680 log_write(0, LOG_MAIN|LOG_PANIC,
2681 "expansion of \"%s\" (message_id_header_domain) "
2682 "failed: %s", message_id_domain, expand_string_message);
2684 else if (*new_id_domain != 0)
2686 id_domain = new_id_domain;
2687 for (p = id_domain; *p != 0; p++)
2688 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2692 /* Permit all characters except controls and RFC 2822 specials in the
2693 additional text part. */
2695 if (message_id_text != NULL)
2697 uschar *new_id_text = expand_string(message_id_text);
2698 if (new_id_text == NULL)
2700 if (!expand_string_forcedfail)
2701 log_write(0, LOG_MAIN|LOG_PANIC,
2702 "expansion of \"%s\" (message_id_header_text) "
2703 "failed: %s", message_id_text, expand_string_message);
2705 else if (*new_id_text != 0)
2707 id_text = new_id_text;
2708 for (p = id_text; *p != 0; p++)
2709 if (mac_iscntrl_or_special(*p)) *p = '-';
2713 /* Add the header line
2714 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2715 * appended, to preserve classical expectations of header ordering. */
2717 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2718 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2719 (*id_text == 0)? "" : ".", id_text, id_domain);
2722 /* If we are to log recipients, keep a copy of the raw ones before any possible
2723 rewriting. Must copy the count, because later ACLs and the local_scan()
2724 function may mess with the real recipients. */
2726 if (LOGGING(received_recipients))
2728 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2729 for (i = 0; i < recipients_count; i++)
2730 raw_recipients[i] = string_copy(recipients_list[i].address);
2731 raw_recipients_count = recipients_count;
2734 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2735 recipients will get here only if the conditions were right (allow_unqualified_
2736 recipient is TRUE). */
2738 for (i = 0; i < recipients_count; i++)
2739 recipients_list[i].address =
2740 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2741 global_rewrite_rules, rewrite_existflags);
2743 /* If there is no From: header, generate one for local (without
2744 suppress_local_fixups) or submission_mode messages. If there is no sender
2745 address, but the sender is local or this is a local delivery error, use the
2746 originator login. This shouldn't happen for genuine bounces, but might happen
2747 for autoreplies. The addition of From: must be done *before* checking for the
2748 possible addition of a Sender: header, because untrusted_set_sender allows an
2749 untrusted user to set anything in the envelope (which might then get info
2750 From:) but we still want to ensure a valid Sender: if it is required. */
2752 if (from_header == NULL &&
2753 ((sender_host_address == NULL && !suppress_local_fixups)
2754 || submission_mode))
2756 uschar *oname = US"";
2758 /* Use the originator_name if this is a locally submitted message and the
2759 caller is not trusted. For trusted callers, use it only if -F was used to
2760 force its value or if we have a non-SMTP message for which -f was not used
2761 to set the sender. */
2763 if (sender_host_address == NULL)
2765 if (!trusted_caller || sender_name_forced ||
2766 (!smtp_input && !sender_address_forced))
2767 oname = originator_name;
2770 /* For non-locally submitted messages, the only time we use the originator
2771 name is when it was forced by the /name= option on control=submission. */
2775 if (submission_name != NULL) oname = submission_name;
2778 /* Envelope sender is empty */
2780 if (sender_address[0] == 0)
2782 uschar *fromstart, *fromend;
2784 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2785 oname, (oname[0] == 0)? "" : " <");
2786 fromend = (oname[0] == 0)? US"" : US">";
2788 if (sender_local || local_error_message)
2790 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2791 local_part_quote(originator_login), qualify_domain_sender,
2794 else if (submission_mode && authenticated_id != NULL)
2796 if (submission_domain == NULL)
2798 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2799 local_part_quote(authenticated_id), qualify_domain_sender,
2802 else if (submission_domain[0] == 0) /* empty => whole address set */
2804 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2809 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2810 local_part_quote(authenticated_id), submission_domain,
2813 from_header = header_last; /* To get it checked for Sender: */
2817 /* There is a non-null envelope sender. Build the header using the original
2818 sender address, before any rewriting that might have been done while
2823 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2825 (oname[0] == 0)? "" : " <",
2826 (sender_address_unrewritten == NULL)?
2827 sender_address : sender_address_unrewritten,
2828 (oname[0] == 0)? "" : ">");
2830 from_header = header_last; /* To get it checked for Sender: */
2835 /* If the sender is local (without suppress_local_fixups), or if we are in
2836 submission mode and there is an authenticated_id, check that an existing From:
2837 is correct, and if not, generate a Sender: header, unless disabled. Any
2838 previously-existing Sender: header was removed above. Note that sender_local,
2839 as well as being TRUE if the caller of exim is not trusted, is also true if a
2840 trusted caller did not supply a -f argument for non-smtp input. To allow
2841 trusted callers to forge From: without supplying -f, we have to test explicitly
2842 here. If the From: header contains more than one address, then the call to
2843 parse_extract_address fails, and a Sender: header is inserted, as required. */
2845 if (from_header != NULL &&
2846 (active_local_from_check &&
2847 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2848 (submission_mode && authenticated_id != NULL))
2851 BOOL make_sender = TRUE;
2852 int start, end, domain;
2854 uschar *from_address =
2855 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2856 &start, &end, &domain, FALSE);
2857 uschar *generated_sender_address;
2859 if (submission_mode)
2861 if (submission_domain == NULL)
2863 generated_sender_address = string_sprintf("%s@%s",
2864 local_part_quote(authenticated_id), qualify_domain_sender);
2866 else if (submission_domain[0] == 0) /* empty => full address */
2868 generated_sender_address = string_sprintf("%s",
2873 generated_sender_address = string_sprintf("%s@%s",
2874 local_part_quote(authenticated_id), submission_domain);
2878 generated_sender_address = string_sprintf("%s@%s",
2879 local_part_quote(originator_login), qualify_domain_sender);
2881 /* Remove permitted prefixes and suffixes from the local part of the From:
2882 address before doing the comparison with the generated sender. */
2884 if (from_address != NULL)
2887 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2889 if (at != NULL) *at = 0;
2890 from_address += route_check_prefix(from_address, local_from_prefix);
2891 slen = route_check_suffix(from_address, local_from_suffix);
2894 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2895 from_address += slen;
2897 if (at != NULL) *at = '@';
2899 if (strcmpic(generated_sender_address, from_address) == 0 ||
2900 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2901 make_sender = FALSE;
2904 /* We have to cause the Sender header to be rewritten if there are
2905 appropriate rewriting rules. */
2909 if (submission_mode && submission_name == NULL)
2910 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2911 generated_sender_address);
2913 header_add(htype_sender, "%sSender: %s <%s>\n",
2915 submission_mode? submission_name : originator_name,
2916 generated_sender_address);
2919 /* Ensure that a non-null envelope sender address corresponds to the
2920 submission mode sender address. */
2922 if (submission_mode && sender_address[0] != 0)
2924 if (sender_address_unrewritten == NULL)
2925 sender_address_unrewritten = sender_address;
2926 sender_address = generated_sender_address;
2927 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2928 log_write(L_address_rewrite, LOG_MAIN,
2929 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2930 sender_address_unrewritten, generated_sender_address);
2934 /* If there are any rewriting rules, apply them to the sender address, unless
2935 it has already been rewritten as part of verification for SMTP input. */
2937 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2938 sender_address[0] != 0)
2940 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2941 global_rewrite_rules, rewrite_existflags);
2942 DEBUG(D_receive|D_rewrite)
2943 debug_printf("rewritten sender = %s\n", sender_address);
2947 /* The headers must be run through rewrite_header(), because it ensures that
2948 addresses are fully qualified, as well as applying any rewriting rules that may
2951 Qualification of header addresses in a message from a remote host happens only
2952 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2953 appropriate. For local messages, qualification always happens, unless -bnq is
2954 used to explicitly suppress it. No rewriting is done for an unqualified address
2955 that is left untouched.
2957 We start at the second header, skipping our own Received:. This rewriting is
2958 documented as happening *after* recipient addresses are taken from the headers
2959 by the -t command line option. An added Sender: gets rewritten here. */
2961 for (h = header_list->next; h; h = h->next)
2963 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2964 rewrite_existflags, TRUE);
2969 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2970 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2971 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2972 exists, this applies to the set of resent- headers rather than the normal set.
2974 The requirement for a recipient header has been removed in RFC 2822. At this
2975 point in the code, earlier versions of Exim added a To: header for locally
2976 submitted messages, and an empty Bcc: header for others. In the light of the
2977 changes in RFC 2822, this was dropped in November 2003. */
2980 /* If there is no date header, generate one if the message originates locally
2981 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2982 submission mode flag is set. Messages without Date: are not valid, but it seems
2983 to be more confusing if Exim adds one to all remotely-originated messages.
2984 As per Message-Id, we prepend if resending, else append.
2987 if (!date_header_exists &&
2988 ((sender_host_address == NULL && !suppress_local_fixups)
2989 || submission_mode))
2990 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2991 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2993 search_tidyup(); /* Free any cached resources */
2995 /* Show the complete set of headers if debugging. Note that the first one (the
2996 new Received:) has not yet been set. */
3000 debug_printf(">>Headers after rewriting and local additions:\n");
3001 for (h = header_list->next; h != NULL; h = h->next)
3002 debug_printf("%c %s", h->type, h->text);
3006 /* The headers are now complete in store. If we are running in filter
3007 testing mode, that is all this function does. Return TRUE if the message
3008 ended with a dot. */
3010 if (filter_test != FTEST_NONE)
3012 process_info[process_info_len] = 0;
3013 return message_ended == END_DOT;
3016 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3017 think more if it could be handled. Cannot do onward CHUNKING unless
3018 inbound is, but inbound chunking ought to be ok with outbound plain.
3019 Could we do onward CHUNKING given inbound CHUNKING?
3021 if (chunking_state > CHUNKING_OFFERED)
3022 cancel_cutthrough_connection(FALSE, US"chunking active");
3024 /* Cutthrough delivery:
3025 We have to create the Received header now rather than at the end of reception,
3026 so the timestamp behaviour is a change to the normal case.
3027 Having created it, send the headers to the destination. */
3029 if (cutthrough.fd >= 0 && cutthrough.delivery)
3031 if (received_count > received_headers_max)
3033 cancel_cutthrough_connection(TRUE, US"too many headers");
3034 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3035 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3036 "Too many \"Received\" headers",
3038 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3039 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3040 message_id[0] = 0; /* Indicate no message accepted */
3041 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3042 goto TIDYUP; /* Skip to end of function */
3044 received_header_gen();
3045 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3046 (void) cutthrough_headers_send();
3050 /* Open a new spool file for the data portion of the message. We need
3051 to access it both via a file descriptor and a stream. Try to make the
3052 directory if it isn't there. */
3054 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3055 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3057 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3059 if (errno == ENOENT)
3061 (void) directory_make(spool_directory,
3062 spool_sname(US"input", message_subdir),
3063 INPUT_DIRECTORY_MODE, TRUE);
3064 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3067 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3068 spool_name, strerror(errno));
3071 /* Make sure the file's group is the Exim gid, and double-check the mode
3072 because the group setting doesn't always get set automatically. */
3074 if (fchown(data_fd, exim_uid, exim_gid))
3075 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3076 "Failed setting ownership on spool file %s: %s",
3077 spool_name, strerror(errno));
3078 (void)fchmod(data_fd, SPOOL_MODE);
3080 /* We now have data file open. Build a stream for it and lock it. We lock only
3081 the first line of the file (containing the message ID) because otherwise there
3082 are problems when Exim is run under Cygwin (I'm told). See comments in
3083 spool_in.c, where the same locking is done. */
3085 data_file = fdopen(data_fd, "w+");
3086 lock_data.l_type = F_WRLCK;
3087 lock_data.l_whence = SEEK_SET;
3088 lock_data.l_start = 0;
3089 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3091 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3092 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3093 errno, strerror(errno));
3095 /* We have an open, locked data file. Write the message id to it to make it
3096 self-identifying. Then read the remainder of the input of this message and
3097 write it to the data file. If the variable next != NULL, it contains the first
3098 data line (which was read as a header but then turned out not to have the right
3099 format); write it (remembering that it might contain binary zeros). The result
3100 of fwrite() isn't inspected; instead we call ferror() below. */
3102 fprintf(data_file, "%s-D\n", message_id);
3105 uschar *s = next->text;
3106 int len = next->slen;
3107 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3108 body_linecount++; /* Assumes only 1 line */
3111 /* Note that we might already be at end of file, or the logical end of file
3112 (indicated by '.'), or might have encountered an error while writing the
3113 message id or "next" line. */
3115 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3119 message_ended = chunking_state <= CHUNKING_OFFERED
3120 ? read_message_data_smtp(data_file)
3122 ? read_message_bdat_smtp_wire(data_file)
3123 : read_message_bdat_smtp(data_file);
3124 receive_linecount++; /* The terminating "." line */
3126 else message_ended = read_message_data(data_file);
3128 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3129 message_linecount += body_linecount;
3131 switch (message_ended)
3133 /* Handle premature termination of SMTP */
3138 Uunlink(spool_name); /* Lose data file when closed */
3139 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3140 message_id[0] = 0; /* Indicate no message accepted */
3141 smtp_reply = handle_lost_connection(US"");
3143 goto TIDYUP; /* Skip to end of function */
3147 /* Handle message that is too big. Don't use host_or_ident() in the log
3148 message; we want to see the ident value even for non-remote messages. */
3151 Uunlink(spool_name); /* Lose the data file when closed */
3152 cancel_cutthrough_connection(TRUE, US"mail too big");
3153 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3155 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3156 "message too big: read=%d max=%d",
3158 (sender_fullhost == NULL)? "" : " H=",
3159 (sender_fullhost == NULL)? US"" : sender_fullhost,
3160 (sender_ident == NULL)? "" : " U=",
3161 (sender_ident == NULL)? US"" : sender_ident,
3163 thismessage_size_limit);
3167 smtp_reply = US"552 Message size exceeds maximum permitted";
3168 message_id[0] = 0; /* Indicate no message accepted */
3169 goto TIDYUP; /* Skip to end of function */
3173 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3174 give_local_error(ERRMESS_TOOBIG,
3175 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3176 US"message rejected: ", error_rc, data_file, header_list);
3177 /* Does not return */
3181 /* Handle bad BDAT protocol sequence */
3184 Uunlink(spool_name); /* Lose the data file when closed */
3185 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3186 smtp_reply = US""; /* Response already sent */
3187 message_id[0] = 0; /* Indicate no message accepted */
3188 goto TIDYUP; /* Skip to end of function */
3192 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3193 example, there may be some expansion in an ACL that uses a timer.) */
3195 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3197 /* The message body has now been read into the data file. Call fflush() to
3198 empty the buffers in C, and then call fsync() to get the data written out onto
3199 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3200 having to do this). If there was an I/O error on either input or output,
3201 attempt to send an error message, and unlink the spool file. For non-SMTP input
3202 we can then give up. Note that for SMTP input we must swallow the remainder of
3203 the input in cases of output errors, since the far end doesn't expect to see
3204 anything until the terminating dot line is sent. */
3206 if (fflush(data_file) == EOF || ferror(data_file) ||
3207 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3209 uschar *msg_errno = US strerror(errno);
3210 BOOL input_error = (receive_ferror)() != 0;
3211 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3212 input_error? "Input read" : "Spool write",
3214 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3216 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3217 Uunlink(spool_name); /* Lose the data file */
3218 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3223 smtp_reply = US"451 Error while reading input data";
3226 smtp_reply = US"451 Error while writing spool file";
3227 receive_swallow_smtp();
3229 message_id[0] = 0; /* Indicate no message accepted */
3230 goto TIDYUP; /* Skip to end of function */
3235 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3236 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3238 /* Does not return */
3243 /* No I/O errors were encountered while writing the data file. */
3245 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3248 /* If there were any bad addresses extracted by -t, or there were no recipients
3249 left after -t, send a message to the sender of this message, or write it to
3250 stderr if the error handling option is set that way. Note that there may
3251 legitimately be no recipients for an SMTP message if they have all been removed
3254 We need to rewind the data file in order to read it. In the case of no
3255 recipients or stderr error writing, throw the data file away afterwards, and
3256 exit. (This can't be SMTP, which always ensures there's at least one
3257 syntactically good recipient address.) */
3259 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3263 if (recipients_count == 0) debug_printf("*** No recipients\n");
3264 if (bad_addresses != NULL)
3266 error_block *eblock = bad_addresses;
3267 debug_printf("*** Bad address(es)\n");
3268 while (eblock != NULL)
3270 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3271 eblock = eblock->next;
3276 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3278 /* If configured to send errors to the sender, but this fails, force
3279 a failure error code. We use a special one for no recipients so that it
3280 can be detected by the autoreply transport. Otherwise error_rc is set to
3281 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3282 it is EXIT_SUCCESS. */
3284 if (error_handling == ERRORS_SENDER)
3286 if (!moan_to_sender(
3287 (bad_addresses == NULL)?
3288 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3289 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3290 bad_addresses, header_list, data_file, FALSE))
3291 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3295 if (bad_addresses == NULL)
3297 if (extracted_ignored)
3298 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3300 fprintf(stderr, "exim: no recipients in message\n");
3304 fprintf(stderr, "exim: invalid address%s",
3305 (bad_addresses->next == NULL)? ":" : "es:\n");
3306 while (bad_addresses != NULL)
3308 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3309 bad_addresses->text2);
3310 bad_addresses = bad_addresses->next;
3315 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3317 Uunlink(spool_name);
3318 (void)fclose(data_file);
3319 exim_exit(error_rc, US"receiving");
3323 /* Data file successfully written. Generate text for the Received: header by
3324 expanding the configured string, and adding a timestamp. By leaving this
3325 operation till now, we ensure that the timestamp is the time that message
3326 reception was completed. However, this is deliberately done before calling the
3327 data ACL and local_scan().
3329 This Received: header may therefore be inspected by the data ACL and by code in
3330 the local_scan() function. When they have run, we update the timestamp to be
3331 the final time of reception.
3333 If there is just one recipient, set up its value in the $received_for variable
3334 for use when we generate the Received: header.
3336 Note: the checking for too many Received: headers is handled by the delivery
3338 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3340 if (received_header->text == NULL) /* Non-cutthrough case */
3342 received_header_gen();
3344 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3346 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3347 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3349 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3350 now, before running the DATA ACL. */
3352 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3355 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3356 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3358 /* If an ACL is specified for checking things at this stage of reception of a
3359 message, run it, unless all the recipients were removed by "discard" in earlier
3360 ACLs. That is the only case in which recipients_count can be zero at this
3361 stage. Set deliver_datafile to point to the data file so that $message_body and
3362 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3365 deliver_datafile = data_fd;
3368 enable_dollar_recipients = TRUE;
3370 if (recipients_count == 0)
3371 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3375 /* Handle interactive SMTP messages */
3377 if (smtp_input && !smtp_batched_input)
3380 #ifndef DISABLE_DKIM
3381 if (!dkim_disable_verify)
3383 /* Finish verification */
3384 dkim_exim_verify_finish();
3386 /* Check if we must run the DKIM ACL */
3387 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3389 uschar * dkim_verify_signers_expanded =
3390 expand_string(dkim_verify_signers);
3391 gstring * results = NULL;
3395 gstring * seen_items = NULL;
3396 int old_pool = store_pool;
3398 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3400 if (!(ptr = dkim_verify_signers_expanded))
3401 log_write(0, LOG_MAIN|LOG_PANIC,
3402 "expansion of dkim_verify_signers option failed: %s",
3403 expand_string_message);
3405 /* Default to OK when no items are present */
3407 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3409 /* Prevent running ACL for an empty item */
3410 if (!item || !*item) continue;
3412 /* Only run ACL once for each domain or identity,
3413 no matter how often it appears in the expanded list. */
3417 const uschar * seen_items_list = string_from_gstring(seen_items);
3419 BOOL seen_this_item = FALSE;
3421 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3423 if (Ustrcmp(seen_item,item) == 0)
3425 seen_this_item = TRUE;
3432 debug_printf("acl_smtp_dkim: skipping signer %s, "
3433 "already seen\n", item);
3437 seen_items = string_catn(seen_items, US":", 1);
3439 seen_items = string_cat(seen_items, item);
3441 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3445 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3446 "skipping remaining items\n", rc, item);
3447 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3451 dkim_verify_status = string_from_gstring(results);
3452 store_pool = old_pool;
3453 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3456 recipients_count = 0;
3457 blackholed_by = US"DKIM ACL";
3459 blackhole_log_msg = string_sprintf(": %s", log_msg);
3463 Uunlink(spool_name);
3464 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3465 smtp_yield = FALSE; /* No more messages after dropped connection */
3466 smtp_reply = US""; /* Indicate reply already sent */
3467 message_id[0] = 0; /* Indicate no message accepted */
3468 goto TIDYUP; /* Skip to end of function */
3472 dkim_exim_verify_log_all();
3474 #endif /* DISABLE_DKIM */
3476 #ifdef WITH_CONTENT_SCAN
3477 if ( recipients_count > 0
3479 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3482 #endif /* WITH_CONTENT_SCAN */
3484 #ifdef EXPERIMENTAL_DMARC
3485 dmarc_up = dmarc_store_data(from_header);
3486 #endif /* EXPERIMENTAL_DMARC */
3488 #ifndef DISABLE_PRDR
3489 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3493 int all_fail = FAIL;
3495 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3496 /* Loop through recipients, responses must be in same order received */
3497 for (c = 0; recipients_count > c; c++)
3499 uschar * addr= recipients_list[c].address;
3500 uschar * msg= US"PRDR R=<%s> %s";
3503 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3504 addr, c+1, recipients_count);
3505 rc = acl_check(ACL_WHERE_PRDR, addr,
3506 acl_smtp_data_prdr, &user_msg, &log_msg);
3508 /* If any recipient rejected content, indicate it in final message */
3510 /* If all recipients rejected, indicate in final message */
3515 case OK: case DISCARD: code = US"250"; break;
3516 case DEFER: code = US"450"; break;
3517 default: code = US"550"; break;
3519 if (user_msg != NULL)
3520 smtp_user_msg(code, user_msg);
3525 case OK: case DISCARD:
3526 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3528 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3530 msg = string_sprintf(CS msg, addr, "refusal"); break;
3532 smtp_user_msg(code, msg);
3534 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3535 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3536 else log_write(0, LOG_MAIN, "%s", CS msg);
3538 if (rc != OK) { receive_remove_recipient(addr); c--; }
3540 /* Set up final message, used if data acl gives OK */
3541 smtp_reply = string_sprintf("%s id=%s message %s",
3542 all_fail == FAIL ? US"550" : US"250",
3545 ? US"rejected for all recipients"
3548 : US"accepted for some recipients");
3549 if (recipients_count == 0)
3551 message_id[0] = 0; /* Indicate no message accepted */
3556 prdr_requested = FALSE;
3557 #endif /* !DISABLE_PRDR */
3559 /* Check the recipients count again, as the MIME ACL might have changed
3562 if (acl_smtp_data != NULL && recipients_count > 0)
3564 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3565 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3568 recipients_count = 0;
3569 blackholed_by = US"DATA ACL";
3571 blackhole_log_msg = string_sprintf(": %s", log_msg);
3572 cancel_cutthrough_connection(TRUE, US"data acl discard");
3576 Uunlink(spool_name);
3577 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3578 #ifdef WITH_CONTENT_SCAN
3581 #ifdef EXPERIMENTAL_DCC
3584 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3585 smtp_yield = FALSE; /* No more messages after dropped connection */
3586 smtp_reply = US""; /* Indicate reply already sent */
3587 message_id[0] = 0; /* Indicate no message accepted */
3588 goto TIDYUP; /* Skip to end of function */
3593 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3594 we cannot take different actions for permanent and temporary rejections. */
3599 #ifdef WITH_CONTENT_SCAN
3600 if ( acl_not_smtp_mime
3601 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3605 #endif /* WITH_CONTENT_SCAN */
3607 if (acl_not_smtp != NULL)
3609 uschar *user_msg, *log_msg;
3610 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3613 recipients_count = 0;
3614 blackholed_by = US"non-SMTP ACL";
3615 if (log_msg != NULL)
3616 blackhole_log_msg = string_sprintf(": %s", log_msg);
3620 Uunlink(spool_name);
3621 #ifdef WITH_CONTENT_SCAN
3624 #ifdef EXPERIMENTAL_DCC
3627 /* The ACL can specify where rejections are to be logged, possibly
3628 nowhere. The default is main and reject logs. */
3630 if (log_reject_target != 0)
3631 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3632 sender_address, log_msg);
3634 if (user_msg == NULL) user_msg = US"local configuration problem";
3635 if (smtp_batched_input)
3637 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3638 /* Does not return */
3642 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3643 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3644 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3646 /* Does not return */
3649 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3653 /* The applicable ACLs have been run */
3655 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3656 if (queue_only_policy) queued_by = US"ACL";
3659 #ifdef WITH_CONTENT_SCAN
3663 #ifdef EXPERIMENTAL_DCC
3668 /* The final check on the message is to run the scan_local() function. The
3669 version supplied with Exim always accepts, but this is a hook for sysadmins to
3670 supply their own checking code. The local_scan() function is run even when all
3671 the recipients have been discarded. */
3672 /*XXS could we avoid this for the standard case, given that few people will use it? */
3674 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3676 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3677 deleted, and the incident gets logged. */
3679 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3680 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3681 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3682 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3684 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3685 local_scan_timeout);
3686 local_scan_data = NULL;
3688 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3689 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3690 rc = local_scan(data_fd, &local_scan_data);
3692 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3694 enable_dollar_recipients = FALSE;
3696 store_pool = POOL_MAIN; /* In case changed */
3697 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3700 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3701 os_non_restarting_signal(SIGFPE, SIG_DFL);
3702 os_non_restarting_signal(SIGILL, SIG_DFL);
3703 os_non_restarting_signal(SIGBUS, SIG_DFL);
3705 /* The length check is paranoia against some runaway code, and also because
3706 (for a success return) lines in the spool file are read into big_buffer. */
3708 if (local_scan_data != NULL)
3710 int len = Ustrlen(local_scan_data);
3711 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3712 local_scan_data = string_copyn(local_scan_data, len);
3715 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3717 if (!deliver_freeze) /* ACL might have already frozen */
3719 deliver_freeze = TRUE;
3720 deliver_frozen_at = time(NULL);
3721 frozen_by = US"local_scan()";
3723 rc = LOCAL_SCAN_ACCEPT;
3725 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3727 if (!queue_only_policy) /* ACL might have already queued */
3729 queue_only_policy = TRUE;
3730 queued_by = US"local_scan()";
3732 rc = LOCAL_SCAN_ACCEPT;
3735 /* Message accepted: remove newlines in local_scan_data because otherwise
3736 the spool file gets corrupted. Ensure that all recipients are qualified. */
3738 if (rc == LOCAL_SCAN_ACCEPT)
3740 if (local_scan_data != NULL)
3743 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3745 for (i = 0; i < recipients_count; i++)
3747 recipient_item *r = recipients_list + i;
3748 r->address = rewrite_address_qualify(r->address, TRUE);
3749 if (r->errors_to != NULL)
3750 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3752 if (recipients_count == 0 && blackholed_by == NULL)
3753 blackholed_by = US"local_scan";
3756 /* Message rejected: newlines permitted in local_scan_data to generate
3757 multiline SMTP responses. */
3761 uschar *istemp = US"";
3765 errmsg = local_scan_data;
3767 Uunlink(spool_name); /* Cancel this message */
3771 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3772 "rejection given", rc);
3775 case LOCAL_SCAN_REJECT_NOLOGHDR:
3776 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3779 case LOCAL_SCAN_REJECT:
3780 smtp_code = US"550";
3781 if (!errmsg) errmsg = US"Administrative prohibition";
3784 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3785 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3788 case LOCAL_SCAN_TEMPREJECT:
3790 smtp_code = US"451";
3791 if (!errmsg) errmsg = US"Temporary local problem";
3792 istemp = US"temporarily ";
3796 g = string_append(NULL, 2, US"F=",
3797 sender_address[0] == 0 ? US"<>" : sender_address);
3798 g = add_host_info_for_log(g);
3800 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3801 string_from_gstring(g), istemp, string_printing(errmsg));
3805 if (!smtp_batched_input)
3807 smtp_respond(smtp_code, 3, TRUE, errmsg);
3808 message_id[0] = 0; /* Indicate no message accepted */
3809 smtp_reply = US""; /* Indicate reply already sent */
3810 goto TIDYUP; /* Skip to end of function */
3814 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3815 /* Does not return */
3820 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3821 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3822 US"message rejected by local scan code: ", error_rc, data_file,
3824 /* Does not return */
3828 /* Reset signal handlers to ignore signals that previously would have caused
3829 the message to be abandoned. */
3831 signal(SIGTERM, SIG_IGN);
3832 signal(SIGINT, SIG_IGN);
3835 /* Ensure the first time flag is set in the newly-received message. */
3837 deliver_firsttime = TRUE;
3839 #ifdef EXPERIMENTAL_BRIGHTMAIL
3841 { /* rewind data file */
3842 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3843 bmi_verdicts = bmi_process_message(header_list, data_fd);
3847 /* Update the timestamp in our Received: header to account for any time taken by
3848 an ACL or by local_scan(). The new time is the time that all reception
3849 processing is complete. */
3851 timestamp = expand_string(US"${tod_full}");
3852 tslen = Ustrlen(timestamp);
3854 memcpy(received_header->text + received_header->slen - tslen - 1,
3857 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3861 deliver_freeze = FALSE;
3862 queue_only_policy = FALSE;
3865 /* Keep the data file open until we have written the header file, in order to
3866 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3867 don't write the header file, and we unlink the data file. If writing the header
3868 file fails, we have failed to accept this message. */
3870 if (host_checking || blackholed_by != NULL)
3873 Uunlink(spool_name);
3874 msg_size = 0; /* Compute size for log line */
3875 for (h = header_list; h != NULL; h = h->next)
3876 if (h->type != '*') msg_size += h->slen;
3879 /* Write the -H file */
3882 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3884 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3885 Uunlink(spool_name); /* Lose the data file */
3889 smtp_reply = US"451 Error in writing spool file";
3890 message_id[0] = 0; /* Indicate no message accepted */
3895 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3896 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3898 /* Does not return */
3903 /* The message has now been successfully received. */
3905 receive_messagecount++;
3907 /* In SMTP sessions we may receive several in one connection. After each one,
3908 we wait for the clock to tick at the level of message-id granularity. This is
3909 so that the combination of time+pid is unique, even on systems where the pid
3910 can be re-used within our time interval. We can't shorten the interval without
3911 re-designing the message-id. See comments above where the message id is
3912 created. This is Something For The Future. */
3914 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3915 exim_wait_tick(&message_id_tv, id_resolution);
3917 /* Add data size to written header size. We do not count the initial file name
3918 that is in the file, but we do add one extra for the notional blank line that
3919 precedes the data. This total differs from message_size in that it include the
3920 added Received: header and any other headers that got created locally. */
3923 fstat(data_fd, &statbuf);
3925 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3927 /* Generate a "message received" log entry. We do this by building up a dynamic
3928 string as required. Since we commonly want to add two items at a time, use a
3929 macro to simplify the coding. We log the arrival of a new message while the
3930 file is still locked, just in case the machine is *really* fast, and delivers
3931 it first! Include any message id that is in the message - since the syntax of a
3932 message id is actually an addr-spec, we can use the parse routine to canonicalize
3935 g = string_get(256);
3937 g = string_append(g, 2,
3938 fake_response == FAIL ? US"(= " : US"<= ",
3939 sender_address[0] == 0 ? US"<>" : sender_address);
3940 if (message_reference)
3941 g = string_append(g, 2, US" R=", message_reference);
3943 g = add_host_info_for_log(g);
3946 if (LOGGING(tls_cipher) && tls_in.cipher)
3947 g = string_append(g, 2, US" X=", tls_in.cipher);
3948 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3949 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3950 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3951 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3952 if (LOGGING(tls_sni) && tls_in.sni)
3953 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3956 if (sender_host_authenticated)
3958 g = string_append(g, 2, US" A=", sender_host_authenticated);
3959 if (authenticated_id)
3961 g = string_append(g, 2, US":", authenticated_id);
3962 if (LOGGING(smtp_mailauth) && authenticated_sender)
3963 g = string_append(g, 2, US":", authenticated_sender);
3967 #ifndef DISABLE_PRDR
3969 g = string_catn(g, US" PRDR", 5);
3972 #ifdef SUPPORT_PROXY
3973 if (proxy_session && LOGGING(proxy))
3974 g = string_append(g, 2, US" PRX=", proxy_local_address);
3977 if (chunking_state > CHUNKING_OFFERED)
3978 g = string_catn(g, US" K", 2);
3980 sprintf(CS big_buffer, "%d", msg_size);
3981 g = string_append(g, 2, US" S=", big_buffer);
3983 /* log 8BITMIME mode announced in MAIL_FROM
3987 if (LOGGING(8bitmime))
3989 sprintf(CS big_buffer, "%d", body_8bitmime);
3990 g = string_append(g, 2, US" M8S=", big_buffer);
3994 g = string_append(g, 2, US" Q=", queue_name);
3996 /* If an addr-spec in a message-id contains a quoted string, it can contain
3997 any characters except " \ and CR and so in particular it can contain NL!
3998 Therefore, make sure we use a printing-characters only version for the log.
3999 Also, allow for domain literals in the message id. */
4004 BOOL save_allow_domain_literals = allow_domain_literals;
4005 allow_domain_literals = TRUE;
4006 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4007 &errmsg, &start, &end, &domain, FALSE);
4008 allow_domain_literals = save_allow_domain_literals;
4010 g = string_append(g, 2, US" id=", string_printing(old_id));
4013 /* If subject logging is turned on, create suitable printing-character
4014 text. By expanding $h_subject: we make use of the MIME decoding. */
4016 if (LOGGING(subject) && subject_header != NULL)
4019 uschar *p = big_buffer;
4020 uschar *ss = expand_string(US"$h_subject:");
4022 /* Backslash-quote any double quotes or backslashes so as to make a
4023 a C-like string, and turn any non-printers into escape sequences. */
4026 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4028 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4033 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4036 /* Terminate the string: string_cat() and string_append() leave room, but do
4037 not put the zero in. */
4039 (void) string_from_gstring(g);
4041 /* Create a message log file if message logs are being used and this message is
4042 not blackholed. Write the reception stuff to it. We used to leave message log
4043 creation until the first delivery, but this has proved confusing for some
4046 if (message_logs && !blackholed_by)
4050 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4052 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4056 (void)directory_make(spool_directory,
4057 spool_sname(US"msglog", message_subdir),
4058 MSGLOG_DIRECTORY_MODE, TRUE);
4059 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4063 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4064 spool_name, strerror(errno));
4067 FILE *message_log = fdopen(fd, "a");
4068 if (message_log == NULL)
4070 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4071 spool_name, strerror(errno));
4076 uschar *now = tod_stamp(tod_log);
4077 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4078 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4080 if (queue_only_policy) fprintf(message_log,
4081 "%s no immediate delivery: queued%s%s by %s\n", now,
4082 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4084 (void)fclose(message_log);
4089 /* Everything has now been done for a successful message except logging its
4090 arrival, and outputting an SMTP response. While writing to the log, set a flag
4091 to cause a call to receive_bomb_out() if the log cannot be opened. */
4093 receive_call_bombout = TRUE;
4095 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4096 connection has gone away. This can only be done if there is no unconsumed input
4097 waiting in the local input buffer. We can test for this by calling
4098 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4099 input to be sent following the final dot, so the presence of following input is
4102 If the connection is still present, but there is no unread input for the
4103 socket, the result of a select() call will be zero. If, however, the connection
4104 has gone away, or if there is pending input, the result of select() will be
4105 non-zero. The two cases can be distinguished by trying to read the next input
4106 character. If we succeed, we can unread it so that it remains in the local
4107 buffer for handling later. If not, the connection has been lost.
4109 Of course, since TCP/IP is asynchronous, there is always a chance that the
4110 connection will vanish between the time of this test and the sending of the
4111 response, but the chance of this happening should be small. */
4113 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4114 !receive_smtp_buffered())
4117 fd_set select_check;
4118 FD_ZERO(&select_check);
4119 FD_SET(fileno(smtp_in), &select_check);
4123 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4125 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4126 if (c != EOF) (receive_ungetc)(c); else
4128 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4129 smtp_reply = US""; /* No attempt to send a response */
4130 smtp_yield = FALSE; /* Nothing more on this connection */
4132 /* Re-use the log line workspace */
4135 g = string_cat(g, US"SMTP connection lost after final dot");
4136 g = add_host_info_for_log(g);
4137 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4139 /* Delete the files for this aborted message. */
4141 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4142 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4143 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4150 /* The connection has not gone away; we really are going to take responsibility
4151 for this message. */
4153 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4156 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4157 the sender's dot (below).
4158 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4159 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4160 in which case pass temp-reject back to initiator and dump the files.
4162 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4164 XXX We do not handle queue-only, freezing, or blackholes.
4166 if(cutthrough.fd >= 0 && cutthrough.delivery)
4168 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4169 /* Logging was done in finaldot() */
4172 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4173 cutthrough_done = ACCEPTED;
4174 break; /* message_id needed for SMTP accept below */
4176 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4177 ... for which, pass back the exact error */
4178 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4181 default: /* Unknown response, or error. Treat as temp-reject. */
4182 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4183 break; /* message_id needed for SMTP accept below */
4185 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4186 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4187 cutthrough_done = PERM_REJ;
4192 #ifndef DISABLE_PRDR
4193 if(!smtp_reply || prdr_requested)
4198 log_write(0, LOG_MAIN |
4199 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4200 (LOGGING(received_sender)? LOG_SENDER : 0),
4203 /* Log any control actions taken by an ACL or local_scan(). */
4205 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4206 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4207 "no immediate delivery: queued%s%s by %s",
4208 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4211 receive_call_bombout = FALSE;
4213 store_reset(g); /* The store for the main log message can be reused */
4215 /* If the message is frozen, and freeze_tell is set, do the telling. */
4217 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4219 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4220 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4221 message_id, frozen_by, sender_address);
4225 /* Either a message has been successfully received and written to the two spool
4226 files, or an error in writing the spool has occurred for an SMTP message, or
4227 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4228 we will have already given up because there's no point in carrying on!) In
4229 either event, we must now close (and thereby unlock) the data file. In the
4230 successful case, this leaves the message on the spool, ready for delivery. In
4231 the error case, the spool file will be deleted. Then tidy up store, interact
4232 with an SMTP call if necessary, and return.
4234 A fflush() was done earlier in the expectation that any write errors on the
4235 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4236 possible for fclose() to fail - but what to do? What has happened to the lock
4241 process_info[process_info_len] = 0; /* Remove message id */
4242 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4244 /* Now reset signal handlers to their defaults */
4246 signal(SIGTERM, SIG_DFL);
4247 signal(SIGINT, SIG_DFL);
4249 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4250 value, which defaults TRUE - meaning there may be more incoming messages from
4251 this connection. For non-SMTP callers (where there is only ever one message),
4252 the default is FALSE. */
4258 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4259 is set to the response that should be sent. When it is NULL, we generate
4260 default responses. After an ACL error or local_scan() error, the response has
4261 already been sent, and smtp_reply is an empty string to indicate this. */
4263 if (!smtp_batched_input)
4267 if (fake_response != OK)
4268 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4269 3, TRUE, fake_response_text);
4271 /* An OK response is required; use "message" text if present. */
4275 uschar *code = US"250";
4277 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4278 smtp_respond(code, len, TRUE, user_msg);
4281 /* Default OK response */
4283 else if (chunking_state > CHUNKING_OFFERED)
4285 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4286 chunking_datasize, message_size+message_linecount, message_id);
4287 chunking_state = CHUNKING_OFFERED;
4290 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4294 "\n**** SMTP testing: that is not a real message id!\n\n");
4297 /* smtp_reply is set non-empty */
4299 else if (smtp_reply[0] != 0)
4300 if (fake_response != OK && (smtp_reply[0] == '2'))
4301 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4302 fake_response_text);
4304 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4306 switch (cutthrough_done)
4309 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4311 /* Delete spool files */
4312 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4313 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4314 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4318 if (cutthrough.defer_pass)
4320 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4321 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4322 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4327 if (cutthrough_done != NOT_TRIED)
4329 message_id[0] = 0; /* Prevent a delivery from starting */
4330 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4331 cutthrough.defer_pass = FALSE;
4335 /* For batched SMTP, generate an error message on failure, and do
4336 nothing on success. The function moan_smtp_batch() does not return -
4337 it exits from the program with a non-zero return code. */
4339 else if (smtp_reply)
4340 moan_smtp_batch(NULL, "%s", smtp_reply);
4344 /* If blackholing, we can immediately log this message's sad fate. The data
4345 file has already been unlinked, and the header file was never written to disk.
4346 We must now indicate that nothing was received, to prevent a delivery from
4351 const uschar *detail = local_scan_data
4352 ? string_printing(local_scan_data)
4353 : string_sprintf("(%s discarded recipients)", blackholed_by);
4354 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4355 log_write(0, LOG_MAIN, "Completed");
4359 /* Reset headers so that logging of rejects for a subsequent message doesn't
4360 include them. It is also important to set header_last = NULL before exiting
4361 from this function, as this prevents certain rewrites that might happen during
4362 subsequent verifying (of another incoming message) from trying to add headers
4363 when they shouldn't. */
4365 header_list = header_last = NULL;
4367 return yield; /* TRUE if more messages (SMTP only) */
4370 /* End of receive.c */