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);
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);
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: writing spoolfile in wire format\n");
1027 spool_file_wireformat = TRUE;
1031 if (chunking_data_left > 0)
1033 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1034 uschar * buf = bdat_getbuf(&len);
1036 message_size += len;
1037 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1039 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1041 case EOF: return END_EOF;
1042 case EOD: return END_DOT;
1043 case ERR: return END_PROTOCOL;
1049 max_received_linelength
1053 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1056 if (message_size > thismessage_size_limit) return END_SIZE;
1064 /*************************************************
1065 * Swallow SMTP message *
1066 *************************************************/
1068 /* This function is called when there has been some kind of error while reading
1069 an SMTP message, and the remaining data may need to be swallowed. It is global
1070 because it is called from smtp_closedown() to shut down an incoming call
1073 Argument: a FILE from which to read the message
1078 receive_swallow_smtp(void)
1080 /*XXX CHUNKING: not enough. read chunks until RSET? */
1081 if (message_ended >= END_NOTENDED)
1082 message_ended = read_message_data_smtp(NULL);
1087 /*************************************************
1088 * Handle lost SMTP connection *
1089 *************************************************/
1091 /* This function logs connection loss incidents and generates an appropriate
1094 Argument: additional data for the message
1095 Returns: the SMTP response
1099 handle_lost_connection(uschar *s)
1101 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1102 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1103 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1104 return US"421 Lost incoming connection";
1110 /*************************************************
1111 * Handle a non-smtp reception error *
1112 *************************************************/
1114 /* This function is called for various errors during the reception of non-SMTP
1115 messages. It either sends a message to the sender of the problem message, or it
1116 writes to the standard error stream.
1119 errcode code for moan_to_sender(), identifying the error
1120 text1 first message text, passed to moan_to_sender()
1121 text2 second message text, used only for stderrr
1122 error_rc code to pass to exim_exit if no problem
1123 f FILE containing body of message (may be stdin)
1124 hptr pointer to instore headers or NULL
1126 Returns: calls exim_exit(), which does not return
1130 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1131 FILE *f, header_line *hptr)
1133 if (error_handling == ERRORS_SENDER)
1137 eblock.text1 = text1;
1138 eblock.text2 = US"";
1139 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1140 error_rc = EXIT_FAILURE;
1143 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1145 exim_exit(error_rc);
1150 /*************************************************
1151 * Add header lines set up by ACL *
1152 *************************************************/
1154 /* This function is called to add the header lines that were set up by
1155 statements in an ACL to the list of headers in memory. It is done in two stages
1156 like this, because when the ACL for RCPT is running, the other headers have not
1157 yet been received. This function is called twice; once just before running the
1158 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1159 are visible to the DATA ACL.
1161 Originally these header lines were added at the end. Now there is support for
1162 three different places: top, bottom, and after the Received: header(s). There
1163 will always be at least one Received: header, even if it is marked deleted, and
1164 even if something else has been put in front of it.
1167 acl_name text to identify which ACL
1173 add_acl_headers(int where, uschar *acl_name)
1175 header_line *h, *next;
1176 header_line *last_received = NULL;
1180 case ACL_WHERE_DKIM:
1181 case ACL_WHERE_MIME:
1182 case ACL_WHERE_DATA:
1183 if ( cutthrough.fd >= 0 && cutthrough.delivery
1184 && (acl_removed_headers || acl_added_headers))
1186 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1187 " will not take effect on cutthrough deliveries");
1192 if (acl_removed_headers)
1194 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1196 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1198 const uschar * list = acl_removed_headers;
1199 int sep = ':'; /* This is specified as a colon-separated list */
1203 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1204 if (header_testname(h, s, Ustrlen(s), FALSE))
1206 h->type = htype_old;
1207 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1210 acl_removed_headers = NULL;
1211 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1214 if (!acl_added_headers) return;
1215 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1217 for (h = acl_added_headers; h; h = next)
1224 h->next = header_list;
1226 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1230 if (last_received == NULL)
1232 last_received = header_list;
1233 while (!header_testname(last_received, US"Received", 8, FALSE))
1234 last_received = last_received->next;
1235 while (last_received->next != NULL &&
1236 header_testname(last_received->next, US"Received", 8, FALSE))
1237 last_received = last_received->next;
1239 h->next = last_received->next;
1240 last_received->next = h;
1241 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1245 /* add header before any header which is NOT Received: or Resent- */
1246 last_received = header_list;
1247 while ( (last_received->next != NULL) &&
1248 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1249 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1250 last_received = last_received->next;
1251 /* last_received now points to the last Received: or Resent-* header
1252 in an uninterrupted chain of those header types (seen from the beginning
1253 of all headers. Our current header must follow it. */
1254 h->next = last_received->next;
1255 last_received->next = h;
1256 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1261 header_last->next = h;
1265 if (h->next == NULL) header_last = h;
1267 /* Check for one of the known header types (From:, To:, etc.) though in
1268 practice most added headers are going to be "other". Lower case
1269 identification letters are never stored with the header; they are used
1270 for existence tests when messages are received. So discard any lower case
1273 h->type = header_checkname(h, FALSE);
1274 if (h->type >= 'a') h->type = htype_other;
1276 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", header_last->text);
1279 acl_added_headers = NULL;
1280 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1285 /*************************************************
1286 * Add host information for log line *
1287 *************************************************/
1289 /* Called for acceptance and rejecting log lines. This adds information about
1290 the calling host to a string that is being built dynamically.
1293 s the dynamic string
1294 sizeptr points to the size variable
1295 ptrptr points to the pointer variable
1297 Returns: the extended string
1301 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1303 if (sender_fullhost)
1305 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1306 s = string_catn(s, sizeptr, ptrptr, US" DS", 3);
1307 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1308 if (LOGGING(incoming_interface) && interface_address != NULL)
1310 s = string_cat(s, sizeptr, ptrptr,
1311 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1314 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1316 s = string_catn(s, sizeptr, ptrptr, US" TFO", 4);
1317 tcp_in_fastopen_logged = TRUE;
1320 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1321 if (received_protocol)
1322 s = string_append(s, sizeptr, ptrptr, 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[2048];
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 memset(CS rfc822_file_path,0,2048);
1361 /* check if it is a MIME message */
1363 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1364 if ( my_headerlist->type != '*' /* skip deleted headers */
1365 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1368 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1372 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1377 /* make sure the eml mbox file is spooled up */
1378 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1379 { /* error while spooling */
1380 log_write(0, LOG_MAIN|LOG_PANIC,
1381 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1382 Uunlink(spool_name);
1384 #ifdef EXPERIMENTAL_DCC
1387 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1388 message_id[0] = 0; /* Indicate no message accepted */
1389 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1390 return FALSE; /* Indicate skip to end of receive function */
1396 mime_part_count = -1;
1397 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1398 (void)fclose(mbox_file);
1400 if (Ustrlen(rfc822_file_path) > 0)
1402 mime_part_count = mime_part_count_buffer;
1404 if (unlink(CS rfc822_file_path) == -1)
1406 log_write(0, LOG_PANIC,
1407 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1412 /* check if we must check any message/rfc822 attachments */
1416 struct dirent * entry;
1419 scandir = string_copyn(mbox_filename, Ustrrchr(mbox_filename, '/') - mbox_filename);
1421 tempdir = opendir(CS scandir);
1424 if (!(entry = readdir(tempdir)))
1426 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1428 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1429 "%s/%s", scandir, entry->d_name);
1430 DEBUG(D_receive) debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1439 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1441 /* set RFC822 expansion variable */
1443 mime_part_count_buffer = mime_part_count;
1444 goto MIME_ACL_CHECK;
1446 log_write(0, LOG_PANIC,
1447 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1448 unlink(CS rfc822_file_path);
1453 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1456 recipients_count = 0;
1457 *blackholed_by_ptr = US"MIME ACL";
1461 Uunlink(spool_name);
1463 #ifdef EXPERIMENTAL_DCC
1467 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1469 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1470 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1472 message_id[0] = 0; /* Indicate no message accepted */
1473 return FALSE; /* Cause skip to end of receive function */
1479 #endif /* WITH_CONTENT_SCAN */
1484 received_header_gen(void)
1488 header_line *received_header= header_list;
1490 timestamp = expand_string(US"${tod_full}");
1491 if (recipients_count == 1) received_for = recipients_list[0].address;
1492 received = expand_string(received_header_text);
1493 received_for = NULL;
1497 if(spool_name[0] != 0)
1498 Uunlink(spool_name); /* Lose the data file */
1499 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1500 "(received_header_text) failed: %s", string_printing(received_header_text),
1501 expand_string_message);
1504 /* The first element on the header chain is reserved for the Received header,
1505 so all we have to do is fill in the text pointer, and set the type. However, if
1506 the result of the expansion is an empty string, we leave the header marked as
1507 "old" so as to refrain from adding a Received header. */
1509 if (received[0] == 0)
1511 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1512 received_header->type = htype_old;
1516 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1517 received_header->type = htype_received;
1520 received_header->slen = Ustrlen(received_header->text);
1522 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1523 received_header->type, received_header->text);
1528 /*************************************************
1530 *************************************************/
1532 /* Receive a message on the given input, and put it into a pair of spool files.
1533 Either a non-null list of recipients, or the extract flag will be true, or
1534 both. The flag sender_local is true for locally generated messages. The flag
1535 submission_mode is true if an ACL has obeyed "control = submission". The flag
1536 suppress_local_fixups is true if an ACL has obeyed "control =
1537 suppress_local_fixups" or -G was passed on the command-line.
1538 The flag smtp_input is true if the message is to be
1539 handled using SMTP conventions about termination and lines starting with dots.
1540 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1542 If a message was successfully read, message_id[0] will be non-zero.
1544 The general actions of this function are:
1546 . Read the headers of the message (if any) into a chain of store
1549 . If there is a "sender:" header and the message is locally originated,
1550 throw it away, unless the caller is trusted, or unless
1551 active_local_sender_retain is set - which can only happen if
1552 active_local_from_check is false.
1554 . If recipients are to be extracted from the message, build the
1555 recipients list from the headers, removing any that were on the
1556 original recipients list (unless extract_addresses_remove_arguments is
1557 false), and at the same time, remove any bcc header that may be present.
1559 . Get the spool file for the data, sort out its unique name, open
1560 and lock it (but don't give it the name yet).
1562 . Generate a "Message-Id" header if the message doesn't have one, for
1563 locally-originated messages.
1565 . Generate a "Received" header.
1567 . Ensure the recipients list is fully qualified and rewritten if necessary.
1569 . If there are any rewriting rules, apply them to the sender address
1570 and also to the headers.
1572 . If there is no from: header, generate one, for locally-generated messages
1573 and messages in "submission mode" only.
1575 . If the sender is local, check that from: is correct, and if not, generate
1576 a Sender: header, unless message comes from a trusted caller, or this
1577 feature is disabled by active_local_from_check being false.
1579 . If there is no "date" header, generate one, for locally-originated
1580 or submission mode messages only.
1582 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1583 dot_ends mode, to the data file. Leave it open, to hold the lock.
1585 . Write the envelope and the headers to a new file.
1587 . Set the name for the header file; close it.
1589 . Set the name for the data file; close it.
1591 Because this function can potentially be called many times in a single
1592 SMTP connection, all store should be got by store_get(), so that it will be
1593 automatically retrieved after the message is accepted.
1595 FUDGE: It seems that sites on the net send out messages with just LF
1596 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1597 we make the CRs optional in all cases.
1599 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1600 new regime is now in place in which bare CRs in header lines are turned into LF
1601 followed by a space, so as not to terminate the header line.
1603 February 2004: A bare LF in a header line in a message whose first line was
1604 terminated by CRLF is treated in the same way as a bare CR.
1607 extract_recip TRUE if recipients are to be extracted from the message's
1610 Returns: TRUE there are more messages to be read (SMTP input)
1611 FALSE there are no more messages to be read (non-SMTP input
1612 or SMTP connection collapsed, or other failure)
1614 When reading a message for filter testing, the returned value indicates
1615 whether the headers (which is all that is read) were terminated by '.' or
1619 receive_msg(BOOL extract_recip)
1624 int process_info_len = Ustrlen(process_info);
1625 int error_rc = (error_handling == ERRORS_SENDER)?
1626 errors_sender_rc : EXIT_FAILURE;
1627 int header_size = 256;
1628 int start, end, domain, size, sptr;
1631 int prevlines_length = 0;
1633 register int ptr = 0;
1635 BOOL contains_resent_headers = FALSE;
1636 BOOL extracted_ignored = FALSE;
1637 BOOL first_line_ended_crlf = TRUE_UNSET;
1638 BOOL smtp_yield = TRUE;
1641 BOOL resents_exist = FALSE;
1642 uschar *resent_prefix = US"";
1643 uschar *blackholed_by = NULL;
1644 uschar *blackhole_log_msg = US"";
1645 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1648 error_block *bad_addresses = NULL;
1650 uschar *frozen_by = NULL;
1651 uschar *queued_by = NULL;
1654 struct stat statbuf;
1656 /* Final message to give to SMTP caller, and messages from ACLs */
1658 uschar *smtp_reply = NULL;
1659 uschar *user_msg, *log_msg;
1661 /* Working header pointers */
1663 header_line *h, *next;
1665 /* Flags for noting the existence of certain headers (only one left) */
1667 BOOL date_header_exists = FALSE;
1669 /* Pointers to receive the addresses of headers whose contents we need. */
1671 header_line *from_header = NULL;
1672 header_line *subject_header = NULL;
1673 header_line *msgid_header = NULL;
1674 header_line *received_header;
1676 #ifdef EXPERIMENTAL_DMARC
1678 #endif /* EXPERIMENTAL_DMARC */
1680 /* Variables for use when building the Received: header. */
1685 /* Release any open files that might have been cached while preparing to
1686 accept the message - e.g. by verifying addresses - because reading a message
1687 might take a fair bit of real time. */
1691 /* Extracting the recipient list from an input file is incompatible with
1692 cutthrough delivery with the no-spool option. It shouldn't be possible
1693 to set up the combination, but just in case kill any ongoing connection. */
1694 if (extract_recip || !smtp_input)
1695 cancel_cutthrough_connection(TRUE, US"not smtp input");
1697 /* Initialize the chain of headers by setting up a place-holder for Received:
1698 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1699 pointing to the end of the chain to make adding headers simple. */
1701 received_header = header_list = header_last = store_get(sizeof(header_line));
1702 header_list->next = NULL;
1703 header_list->type = htype_old;
1704 header_list->text = NULL;
1705 header_list->slen = 0;
1707 /* Control block for the next header to be read. */
1709 next = store_get(sizeof(header_line));
1710 next->text = store_get(header_size);
1712 /* Initialize message id to be null (indicating no message read), and the
1713 header names list to be the normal list. Indicate there is no data file open
1714 yet, initialize the size and warning count, and deal with no size limit. */
1722 received_count = 1; /* For the one we will add */
1724 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1726 /* While reading the message, the following counts are computed. */
1728 message_linecount = body_linecount = body_zerocount =
1729 max_received_linelength = 0;
1731 #ifndef DISABLE_DKIM
1732 /* Call into DKIM to set up the context. In CHUNKING mode
1733 we clear the dot-stuffing flag */
1734 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1735 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1738 #ifdef EXPERIMENTAL_DMARC
1739 /* initialize libopendmarc */
1740 dmarc_up = dmarc_init();
1743 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1744 ids, and fractions of a second are required. See the comments that precede the
1745 message id creation below. */
1747 (void)gettimeofday(&message_id_tv, NULL);
1749 /* For other uses of the received time we can operate with granularity of one
1750 second, and for that we use the global variable received_time. This is for
1751 things like ultimate message timeouts.XXX */
1753 received_time = message_id_tv;
1755 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1756 happen in the smtp_getc() function when it refills its buffer. */
1758 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1760 /* If not SMTP input, timeout happens only if configured, and we just set a
1761 single timeout for the whole message. */
1763 else if (receive_timeout > 0)
1765 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1766 alarm(receive_timeout);
1769 /* SIGTERM and SIGINT are caught always. */
1771 signal(SIGTERM, data_sigterm_sigint_handler);
1772 signal(SIGINT, data_sigterm_sigint_handler);
1774 /* Header lines in messages are not supposed to be very long, though when
1775 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1776 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1777 storing the header, and extend this as necessary using string_cat().
1779 To cope with total lunacies, impose an upper limit on the length of the header
1780 section of the message, as otherwise the store will fill up. We must also cope
1781 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1782 Folded header lines are joined into one string, leaving the '\n' characters
1783 inside them, so that writing them out reproduces the input.
1785 Loop for each character of each header; the next structure for chaining the
1786 header is set up already, with ptr the offset of the next character in
1791 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1793 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1794 SMTP must have a correct "." terminator. */
1796 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1798 smtp_reply = handle_lost_connection(US" (header)");
1800 goto TIDYUP; /* Skip to end of function */
1803 /* See if we are at the current header's size limit - there must be at least
1804 four bytes left. This allows for the new character plus a zero, plus two for
1805 extra insertions when we are playing games with dots and carriage returns. If
1806 we are at the limit, extend the text buffer. This could have been done
1807 automatically using string_cat() but because this is a tightish loop storing
1808 only one character at a time, we choose to do it inline. Normally
1809 store_extend() will be able to extend the block; only at the end of a big
1810 store block will a copy be needed. To handle the case of very long headers
1811 (and sometimes lunatic messages can have ones that are 100s of K long) we
1812 call store_release() for strings that have been copied - if the string is at
1813 the start of a block (and therefore the only thing in it, because we aren't
1814 doing any other gets), the block gets freed. We can only do this because we
1815 know there are no other calls to store_get() going on. */
1817 if (ptr >= header_size - 4)
1819 int oldsize = header_size;
1820 /* header_size += 256; */
1822 if (!store_extend(next->text, oldsize, header_size))
1824 uschar *newtext = store_get(header_size);
1825 memcpy(newtext, next->text, ptr);
1826 store_release(next->text);
1827 next->text = newtext;
1831 /* Cope with receiving a binary zero. There is dispute about whether
1832 these should be allowed in RFC 822 messages. The middle view is that they
1833 should not be allowed in headers, at least. Exim takes this attitude at
1834 the moment. We can't just stomp on them here, because we don't know that
1835 this line is a header yet. Set a flag to cause scanning later. */
1837 if (ch == 0) had_zero++;
1839 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1840 those from data files use just LF. Treat LF in local SMTP input as a
1841 terminator too. Treat EOF as a line terminator always. */
1843 if (ch == EOF) goto EOL;
1845 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1846 other MTAs accept this. We are therefore forced into this "liberalisation"
1847 too, so we accept LF as a line terminator whatever the source of the message.
1848 However, if the first line of the message ended with a CRLF, we treat a bare
1849 LF specially by inserting a white space after it to ensure that the header
1850 line is not terminated. */
1854 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1855 else if (first_line_ended_crlf) receive_ungetc(' ');
1859 /* This is not the end of the line. If this is SMTP input and this is
1860 the first character in the line and it is a "." character, ignore it.
1861 This implements the dot-doubling rule, though header lines starting with
1862 dots aren't exactly common. They are legal in RFC 822, though. If the
1863 following is CRLF or LF, this is the line that that terminates the
1864 entire message. We set message_ended to indicate this has happened (to
1865 prevent further reading), and break out of the loop, having freed the
1866 empty header, and set next = NULL to indicate no data line. */
1868 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1870 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1873 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1877 ch = '\r'; /* Revert to CR */
1882 message_ended = END_DOT;
1885 break; /* End character-reading loop */
1888 /* For non-SMTP input, the dot at the start of the line was really a data
1889 character. What is now in ch is the following character. We guaranteed
1890 enough space for this above. */
1894 next->text[ptr++] = '.';
1899 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1900 remember this case if this is the first line ending. */
1904 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1907 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1911 /* Otherwise, put back the character after CR, and turn the bare CR
1914 ch = (receive_ungetc)(ch);
1915 next->text[ptr++] = '\n';
1920 /* We have a data character for the header line. */
1922 next->text[ptr++] = ch; /* Add to buffer */
1923 message_size++; /* Total message size so far */
1925 /* Handle failure due to a humungously long header section. The >= allows
1926 for the terminating \n. Add what we have so far onto the headers list so
1927 that it gets reflected in any error message, and back up the just-read
1930 if (message_size >= header_maxsize)
1932 next->text[ptr] = 0;
1934 next->type = htype_other;
1936 header_last->next = next;
1939 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1940 "%s (more than %d characters): message abandoned",
1941 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1945 smtp_reply = US"552 Message header is ridiculously long";
1946 receive_swallow_smtp();
1947 goto TIDYUP; /* Skip to end of function */
1952 give_local_error(ERRMESS_VLONGHEADER,
1953 string_sprintf("message header longer than %d characters received: "
1954 "message not accepted", header_maxsize), US"", error_rc, stdin,
1956 /* Does not return */
1960 continue; /* With next input character */
1962 /* End of header line reached */
1966 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1968 receive_linecount++;
1969 message_linecount++;
1971 /* Keep track of maximum line length */
1973 if (ptr - prevlines_length > max_received_linelength)
1974 max_received_linelength = ptr - prevlines_length;
1975 prevlines_length = ptr + 1;
1977 /* Now put in the terminating newline. There is always space for
1978 at least two more characters. */
1980 next->text[ptr++] = '\n';
1983 /* A blank line signals the end of the headers; release the unwanted
1984 space and set next to NULL to indicate this. */
1993 /* There is data in the line; see if the next input character is a
1994 whitespace character. If it is, we have a continuation of this header line.
1995 There is always space for at least one character at this point. */
1999 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2000 if (nextch == ' ' || nextch == '\t')
2002 next->text[ptr++] = nextch;
2004 continue; /* Iterate the loop */
2006 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2007 else ch = EOF; /* Cause main loop to exit at end */
2010 /* We have got to the real line end. Terminate the string and release store
2011 beyond it. If it turns out to be a real header, internal binary zeros will
2012 be squashed later. */
2014 next->text[ptr] = 0;
2016 store_reset(next->text + ptr + 1);
2018 /* Check the running total size against the overall message size limit. We
2019 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2020 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2021 headers - the code to read the body will then also hit the buffer. */
2023 if (message_size > thismessage_size_limit) break;
2025 /* A line that is not syntactically correct for a header also marks
2026 the end of the headers. In this case, we leave next containing the
2027 first data line. This might actually be several lines because of the
2028 continuation logic applied above, but that doesn't matter.
2030 It turns out that smail, and presumably sendmail, accept leading lines
2033 From ph10 Fri Jan 5 12:35 GMT 1996
2035 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2036 find any documentation of this, but for compatibility it had better be
2037 accepted. Exim restricts it to the case of non-smtp messages, and
2038 treats it as an alternative to the -f command line option. Thus it is
2039 ignored except for trusted users or filter testing. Otherwise it is taken
2040 as the sender address, unless -f was used (sendmail compatibility).
2042 It further turns out that some UUCPs generate the From_line in a different
2045 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2047 The regex for matching these things is now capable of recognizing both
2048 formats (including 2- and 4-digit years in the latter). In fact, the regex
2049 is now configurable, as is the expansion string to fish out the sender.
2051 Even further on it has been discovered that some broken clients send
2052 these lines in SMTP messages. There is now an option to ignore them from
2053 specified hosts or networks. Sigh. */
2055 if (header_last == header_list &&
2058 (sender_host_address != NULL &&
2059 verify_check_host(&ignore_fromline_hosts) == OK)
2061 (sender_host_address == NULL && ignore_fromline_local)
2063 regex_match_and_setup(regex_From, next->text, 0, -1))
2065 if (!sender_address_forced)
2067 uschar *uucp_sender = expand_string(uucp_from_sender);
2068 if (uucp_sender == NULL)
2070 log_write(0, LOG_MAIN|LOG_PANIC,
2071 "expansion of \"%s\" failed after matching "
2072 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2076 int start, end, domain;
2078 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2079 &start, &end, &domain, TRUE);
2080 if (newsender != NULL)
2082 if (domain == 0 && newsender[0] != 0)
2083 newsender = rewrite_address_qualify(newsender, FALSE);
2085 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2087 sender_address = newsender;
2089 if (trusted_caller || filter_test != FTEST_NONE)
2091 authenticated_sender = NULL;
2092 originator_name = US"";
2093 sender_local = FALSE;
2096 if (filter_test != FTEST_NONE)
2097 printf("Sender taken from \"From \" line\n");
2104 /* Not a leading "From " line. Check to see if it is a valid header line.
2105 Header names may contain any non-control characters except space and colon,
2110 uschar *p = next->text;
2112 /* If not a valid header line, break from the header reading loop, leaving
2113 next != NULL, indicating that it holds the first line of the body. */
2115 if (isspace(*p)) break;
2116 while (mac_isgraph(*p) && *p != ':') p++;
2117 while (isspace(*p)) p++;
2120 body_zerocount = had_zero;
2124 /* We have a valid header line. If there were any binary zeroes in
2125 the line, stomp on them here. */
2128 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2130 /* It is perfectly legal to have an empty continuation line
2131 at the end of a header, but it is confusing to humans
2132 looking at such messages, since it looks like a blank line.
2133 Reduce confusion by removing redundant white space at the
2134 end. We know that there is at least one printing character
2135 (the ':' tested for above) so there is no danger of running
2138 p = next->text + ptr - 2;
2141 while (*p == ' ' || *p == '\t') p--;
2142 if (*p != '\n') break;
2143 ptr = (p--) - next->text + 1;
2144 message_size -= next->slen - ptr;
2145 next->text[ptr] = 0;
2149 /* Add the header to the chain */
2151 next->type = htype_other;
2153 header_last->next = next;
2156 /* Check the limit for individual line lengths. This comes after adding to
2157 the chain so that the failing line is reflected if a bounce is generated
2158 (for a local message). */
2160 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2162 log_write(0, LOG_MAIN, "overlong message header line received from "
2163 "%s (more than %d characters): message abandoned",
2164 sender_host_unknown? sender_ident : sender_fullhost,
2165 header_line_maxsize);
2169 smtp_reply = US"552 A message header line is too long";
2170 receive_swallow_smtp();
2171 goto TIDYUP; /* Skip to end of function */
2176 give_local_error(ERRMESS_VLONGHDRLINE,
2177 string_sprintf("message header line longer than %d characters "
2178 "received: message not accepted", header_line_maxsize), US"",
2179 error_rc, stdin, header_list->next);
2180 /* Does not return */
2184 /* Note if any resent- fields exist. */
2186 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2188 resents_exist = TRUE;
2189 resent_prefix = US"Resent-";
2193 /* Reject CHUNKING messages that do not CRLF their first header line */
2195 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2197 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2198 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2200 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2201 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2202 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2205 goto TIDYUP; /* Skip to end of function */
2208 /* The line has been handled. If we have hit EOF, break out of the loop,
2209 indicating no pending data line. */
2211 if (ch == EOF) { next = NULL; break; }
2213 /* Set up for the next header */
2216 next = store_get(sizeof(header_line));
2217 next->text = store_get(header_size);
2220 prevlines_length = 0;
2221 } /* Continue, starting to read the next header */
2223 /* At this point, we have read all the headers into a data structure in main
2224 store. The first header is still the dummy placeholder for the Received: header
2225 we are going to generate a bit later on. If next != NULL, it contains the first
2226 data line - which terminated the headers before reaching a blank line (not the
2231 debug_printf(">>Headers received:\n");
2232 for (h = header_list->next; h; h = h->next)
2233 debug_printf("%s", h->text);
2237 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2238 is dropped immediately after valid headers, the next thing we will see is EOF.
2239 We must test for this specially, as further down the reading of the data is
2240 skipped if already at EOF. */
2242 if (smtp_input && (receive_feof)())
2244 smtp_reply = handle_lost_connection(US" (after header)");
2246 goto TIDYUP; /* Skip to end of function */
2249 /* If this is a filter test run and no headers were read, output a warning
2250 in case there is a mistake in the test message. */
2252 if (filter_test != FTEST_NONE && header_list->next == NULL)
2253 printf("Warning: no message headers read\n");
2256 /* Scan the headers to identify them. Some are merely marked for later
2257 processing; some are dealt with here. */
2259 for (h = header_list->next; h; h = h->next)
2261 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2262 if (is_resent) contains_resent_headers = TRUE;
2264 switch (header_checkname(h, is_resent))
2267 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2271 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2274 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2277 if (!resents_exist || is_resent) date_header_exists = TRUE;
2280 /* Same comments as about Return-Path: below. */
2282 case htype_delivery_date:
2283 if (delivery_date_remove) h->type = htype_old;
2286 /* Same comments as about Return-Path: below. */
2288 case htype_envelope_to:
2289 if (envelope_to_remove) h->type = htype_old;
2292 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2293 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2294 header consists of just the login id of the user who called Exim, rewrite
2295 it with the gecos field first. Apply this rule to Resent-From: if there
2296 are resent- fields. */
2299 h->type = htype_from;
2300 if (!resents_exist || is_resent)
2306 uschar *s = Ustrchr(h->text, ':') + 1;
2307 while (isspace(*s)) s++;
2308 len = h->slen - (s - h->text) - 1;
2309 if (Ustrlen(originator_login) == len &&
2310 strncmpic(s, originator_login, len) == 0)
2312 uschar *name = is_resent? US"Resent-From" : US"From";
2313 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2314 originator_login, qualify_domain_sender);
2315 from_header = header_last;
2316 h->type = htype_old;
2317 DEBUG(D_receive|D_rewrite)
2318 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2324 /* Identify the Message-id: header for generating "in-reply-to" in the
2325 autoreply transport. For incoming logging, save any resent- value. In both
2326 cases, take just the first of any multiples. */
2329 if (msgid_header == NULL && (!resents_exist || is_resent))
2336 /* Flag all Received: headers */
2338 case htype_received:
2339 h->type = htype_received;
2343 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2345 case htype_reply_to:
2346 h->type = htype_reply_to;
2349 /* The Return-path: header is supposed to be added to messages when
2350 they leave the SMTP system. We shouldn't receive messages that already
2351 contain Return-path. However, since Exim generates Return-path: on
2352 local delivery, resent messages may well contain it. We therefore
2353 provide an option (which defaults on) to remove any Return-path: headers
2354 on input. Removal actually means flagging as "old", which prevents the
2355 header being transmitted with the message. */
2357 case htype_return_path:
2358 if (return_path_remove) h->type = htype_old;
2360 /* If we are testing a mail filter file, use the value of the
2361 Return-Path: header to set up the return_path variable, which is not
2362 otherwise set. However, remove any <> that surround the address
2363 because the variable doesn't have these. */
2365 if (filter_test != FTEST_NONE)
2367 uschar *start = h->text + 12;
2368 uschar *end = start + Ustrlen(start);
2369 while (isspace(*start)) start++;
2370 while (end > start && isspace(end[-1])) end--;
2371 if (*start == '<' && end[-1] == '>')
2376 return_path = string_copyn(start, end - start);
2377 printf("Return-path taken from \"Return-path:\" header line\n");
2381 /* If there is a "Sender:" header and the message is locally originated,
2382 and from an untrusted caller and suppress_local_fixups is not set, or if we
2383 are in submission mode for a remote message, mark it "old" so that it will
2384 not be transmitted with the message, unless active_local_sender_retain is
2385 set. (This can only be true if active_local_from_check is false.) If there
2386 are any resent- headers in the message, apply this rule to Resent-Sender:
2387 instead of Sender:. Messages with multiple resent- header sets cannot be
2388 tidily handled. (For this reason, at least one MUA - Pine - turns old
2389 resent- headers into X-resent- headers when resending, leaving just one
2393 h->type = ((!active_local_sender_retain &&
2395 (sender_local && !trusted_caller && !suppress_local_fixups)
2399 (!resents_exist||is_resent))?
2400 htype_old : htype_sender;
2403 /* Remember the Subject: header for logging. There is no Resent-Subject */
2409 /* "To:" gets flagged, and the existence of a recipient header is noted,
2410 whether it's resent- or not. */
2415 to_or_cc_header_exists = TRUE;
2421 /* Extract recipients from the headers if that is required (the -t option).
2422 Note that this is documented as being done *before* any address rewriting takes
2423 place. There are two possibilities:
2425 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2426 recipients already listed are to be REMOVED from the message. Smail 3 works
2427 like this. We need to build a non-recipients tree for that list, because in
2428 subsequent processing this data is held in a tree and that's what the
2429 spool_write_header() function expects. Make sure that non-recipient addresses
2430 are fully qualified and rewritten if necessary.
2432 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2433 those in the command line arguments (and it is rumoured some other MTAs do
2434 this). Therefore, there is an option to make Exim behave this way.
2436 *** Notes on "Resent-" header lines ***
2438 The presence of resent-headers in the message makes -t horribly ambiguous.
2439 Experiments with sendmail showed that it uses recipients for all resent-
2440 headers, totally ignoring the concept of "sets of resent- headers" as described
2441 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2442 with all the addresses in one instance of each header.
2444 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2445 error for -t if there were resent- headers in the message. However, after a
2446 discussion on the mailing list, I've learned that there are MUAs that use
2447 resent- headers with -t, and also that the stuff about sets of resent- headers
2448 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2449 message with -t and resent- header lines makes sure that only *its* resent-
2450 headers are present; previous ones are often renamed as X-resent- for example.
2452 Consequently, Exim has been changed so that, if any resent- header lines are
2453 present, the recipients are taken from all of the appropriate resent- lines,
2454 and not from the ordinary To:, Cc:, etc. */
2459 error_block **bnext = &bad_addresses;
2461 if (extract_addresses_remove_arguments)
2463 while (recipients_count-- > 0)
2465 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2466 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2467 tree_add_nonrecipient(s);
2469 recipients_list = NULL;
2470 recipients_count = recipients_list_max = 0;
2473 /* Now scan the headers */
2475 for (h = header_list->next; h; h = h->next)
2477 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2478 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2480 uschar *s = Ustrchr(h->text, ':') + 1;
2481 while (isspace(*s)) s++;
2483 parse_allow_group = TRUE; /* Allow address group syntax */
2487 uschar *ss = parse_find_address_end(s, FALSE);
2488 uschar *recipient, *errmess, *p, *pp;
2489 int start, end, domain;
2491 /* Check on maximum */
2493 if (recipients_max > 0 && ++rcount > recipients_max)
2495 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2496 US"message rejected: ", error_rc, stdin, NULL);
2497 /* Does not return */
2500 /* Make a copy of the address, and remove any internal newlines. These
2501 may be present as a result of continuations of the header line. The
2502 white space that follows the newline must not be removed - it is part
2505 pp = recipient = store_get(ss - s + 1);
2506 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2511 BOOL b = allow_utf8_domains;
2512 allow_utf8_domains = TRUE;
2514 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2518 if (string_is_utf8(recipient))
2519 message_smtputf8 = TRUE;
2521 allow_utf8_domains = b;
2525 /* Keep a list of all the bad addresses so we can send a single
2526 error message at the end. However, an empty address is not an error;
2527 just ignore it. This can come from an empty group list like
2529 To: Recipients of list:;
2531 If there are no recipients at all, an error will occur later. */
2533 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2535 int len = Ustrlen(s);
2536 error_block *b = store_get(sizeof(error_block));
2537 while (len > 0 && isspace(s[len-1])) len--;
2539 b->text1 = string_printing(string_copyn(s, len));
2545 /* If the recipient is already in the nonrecipients tree, it must
2546 have appeared on the command line with the option extract_addresses_
2547 remove_arguments set. Do not add it to the recipients, and keep a note
2548 that this has happened, in order to give a better error if there are
2549 no recipients left. */
2551 else if (recipient != NULL)
2553 if (tree_search(tree_nonrecipients, recipient) == NULL)
2554 receive_add_recipient(recipient, -1);
2556 extracted_ignored = TRUE;
2559 /* Move on past this address */
2561 s = ss + (*ss? 1:0);
2562 while (isspace(*s)) s++;
2563 } /* Next address */
2565 parse_allow_group = FALSE; /* Reset group syntax flags */
2566 parse_found_group = FALSE;
2568 /* If this was the bcc: header, mark it "old", which means it
2569 will be kept on the spool, but not transmitted as part of the
2572 if (h->type == htype_bcc) h->type = htype_old;
2573 } /* For appropriate header line */
2574 } /* For each header line */
2578 /* Now build the unique message id. This has changed several times over the
2579 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2580 Retaining all the history in the comment has become too unwieldy - read
2581 previous release sources if you want it.
2583 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2584 The first part is the current time, in seconds. The second part is the current
2585 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2586 can hold a number in the range 0-3843. It used to be a computed sequence
2587 number, but is now the fractional component of the current time in units of
2588 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2589 received, Exim ensures that the timer has ticked at the appropriate level
2590 before proceeding, to avoid duplication if the pid happened to be re-used
2591 within the same time period. It seems likely that most messages will take at
2592 least half a millisecond to be received, so no delay will normally be
2593 necessary. At least for some time...
2595 There is a modification when localhost_number is set. Formerly this was allowed
2596 to be as large as 255. Now it is restricted to the range 0-16, and the final
2597 component of the message id becomes (localhost_number * 200) + fractional time
2598 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2600 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2601 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2602 still allows the tttttt field to hold a large enough number to last for some
2603 more decades, and the final two-digit field can hold numbers up to 1295, which
2604 is enough for milliseconds (instead of 1/2000 of a second).
2606 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2607 pid, so it is probably safe because pids have to be positive. The
2608 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2609 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2611 Note that string_base62() returns its data in a static storage block, so it
2612 must be copied before calling string_base62() again. It always returns exactly
2615 There doesn't seem to be anything in the RFC which requires a message id to
2616 start with a letter, but Smail was changed to ensure this. The external form of
2617 the message id (as supplied by string expansion) therefore starts with an
2618 additional leading 'E'. The spool file names do not include this leading
2619 letter and it is not used internally.
2621 NOTE: If ever the format of message ids is changed, the regular expression for
2622 checking that a string is in this format must be updated in a corresponding
2623 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2624 must also be changed to reflect the correct string length. Then, of course,
2625 other programs that rely on the message id format will need updating too. */
2627 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2628 message_id[6] = '-';
2629 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2631 /* Deal with the case where the host number is set. The value of the number was
2632 checked when it was read, to ensure it isn't too big. The timing granularity is
2633 left in id_resolution so that an appropriate wait can be done after receiving
2634 the message, if necessary (we hope it won't be). */
2636 if (host_number_string != NULL)
2638 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2639 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2640 string_base62((long int)(
2641 host_number * (1000000/id_resolution) +
2642 message_id_tv.tv_usec/id_resolution)) + 4);
2645 /* Host number not set: final field is just the fractional time at an
2646 appropriate resolution. */
2650 id_resolution = (BASE_62 == 62)? 500 : 1000;
2651 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2652 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2655 /* Add the current message id onto the current process info string if
2658 (void)string_format(process_info + process_info_len,
2659 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2661 /* If we are using multiple input directories, set up the one for this message
2662 to be the least significant base-62 digit of the time of arrival. Otherwise
2663 ensure that it is an empty string. */
2665 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2667 /* Now that we have the message-id, if there is no message-id: header, generate
2668 one, but only for local (without suppress_local_fixups) or submission mode
2669 messages. This can be user-configured if required, but we had better flatten
2670 any illegal characters therein. */
2672 if (msgid_header == NULL &&
2673 ((sender_host_address == NULL && !suppress_local_fixups)
2674 || submission_mode))
2677 uschar *id_text = US"";
2678 uschar *id_domain = primary_hostname;
2680 /* Permit only letters, digits, dots, and hyphens in the domain */
2682 if (message_id_domain != NULL)
2684 uschar *new_id_domain = expand_string(message_id_domain);
2685 if (new_id_domain == NULL)
2687 if (!expand_string_forcedfail)
2688 log_write(0, LOG_MAIN|LOG_PANIC,
2689 "expansion of \"%s\" (message_id_header_domain) "
2690 "failed: %s", message_id_domain, expand_string_message);
2692 else if (*new_id_domain != 0)
2694 id_domain = new_id_domain;
2695 for (p = id_domain; *p != 0; p++)
2696 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2700 /* Permit all characters except controls and RFC 2822 specials in the
2701 additional text part. */
2703 if (message_id_text != NULL)
2705 uschar *new_id_text = expand_string(message_id_text);
2706 if (new_id_text == NULL)
2708 if (!expand_string_forcedfail)
2709 log_write(0, LOG_MAIN|LOG_PANIC,
2710 "expansion of \"%s\" (message_id_header_text) "
2711 "failed: %s", message_id_text, expand_string_message);
2713 else if (*new_id_text != 0)
2715 id_text = new_id_text;
2716 for (p = id_text; *p != 0; p++)
2717 if (mac_iscntrl_or_special(*p)) *p = '-';
2721 /* Add the header line
2722 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2723 * appended, to preserve classical expectations of header ordering. */
2725 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2726 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2727 (*id_text == 0)? "" : ".", id_text, id_domain);
2730 /* If we are to log recipients, keep a copy of the raw ones before any possible
2731 rewriting. Must copy the count, because later ACLs and the local_scan()
2732 function may mess with the real recipients. */
2734 if (LOGGING(received_recipients))
2736 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2737 for (i = 0; i < recipients_count; i++)
2738 raw_recipients[i] = string_copy(recipients_list[i].address);
2739 raw_recipients_count = recipients_count;
2742 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2743 recipients will get here only if the conditions were right (allow_unqualified_
2744 recipient is TRUE). */
2746 for (i = 0; i < recipients_count; i++)
2747 recipients_list[i].address =
2748 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2749 global_rewrite_rules, rewrite_existflags);
2751 /* If there is no From: header, generate one for local (without
2752 suppress_local_fixups) or submission_mode messages. If there is no sender
2753 address, but the sender is local or this is a local delivery error, use the
2754 originator login. This shouldn't happen for genuine bounces, but might happen
2755 for autoreplies. The addition of From: must be done *before* checking for the
2756 possible addition of a Sender: header, because untrusted_set_sender allows an
2757 untrusted user to set anything in the envelope (which might then get info
2758 From:) but we still want to ensure a valid Sender: if it is required. */
2760 if (from_header == NULL &&
2761 ((sender_host_address == NULL && !suppress_local_fixups)
2762 || submission_mode))
2764 uschar *oname = US"";
2766 /* Use the originator_name if this is a locally submitted message and the
2767 caller is not trusted. For trusted callers, use it only if -F was used to
2768 force its value or if we have a non-SMTP message for which -f was not used
2769 to set the sender. */
2771 if (sender_host_address == NULL)
2773 if (!trusted_caller || sender_name_forced ||
2774 (!smtp_input && !sender_address_forced))
2775 oname = originator_name;
2778 /* For non-locally submitted messages, the only time we use the originator
2779 name is when it was forced by the /name= option on control=submission. */
2783 if (submission_name != NULL) oname = submission_name;
2786 /* Envelope sender is empty */
2788 if (sender_address[0] == 0)
2790 uschar *fromstart, *fromend;
2792 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2793 oname, (oname[0] == 0)? "" : " <");
2794 fromend = (oname[0] == 0)? US"" : US">";
2796 if (sender_local || local_error_message)
2798 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2799 local_part_quote(originator_login), qualify_domain_sender,
2802 else if (submission_mode && authenticated_id != NULL)
2804 if (submission_domain == NULL)
2806 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2807 local_part_quote(authenticated_id), qualify_domain_sender,
2810 else if (submission_domain[0] == 0) /* empty => whole address set */
2812 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2817 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2818 local_part_quote(authenticated_id), submission_domain,
2821 from_header = header_last; /* To get it checked for Sender: */
2825 /* There is a non-null envelope sender. Build the header using the original
2826 sender address, before any rewriting that might have been done while
2831 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2833 (oname[0] == 0)? "" : " <",
2834 (sender_address_unrewritten == NULL)?
2835 sender_address : sender_address_unrewritten,
2836 (oname[0] == 0)? "" : ">");
2838 from_header = header_last; /* To get it checked for Sender: */
2843 /* If the sender is local (without suppress_local_fixups), or if we are in
2844 submission mode and there is an authenticated_id, check that an existing From:
2845 is correct, and if not, generate a Sender: header, unless disabled. Any
2846 previously-existing Sender: header was removed above. Note that sender_local,
2847 as well as being TRUE if the caller of exim is not trusted, is also true if a
2848 trusted caller did not supply a -f argument for non-smtp input. To allow
2849 trusted callers to forge From: without supplying -f, we have to test explicitly
2850 here. If the From: header contains more than one address, then the call to
2851 parse_extract_address fails, and a Sender: header is inserted, as required. */
2853 if (from_header != NULL &&
2854 (active_local_from_check &&
2855 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2856 (submission_mode && authenticated_id != NULL))
2859 BOOL make_sender = TRUE;
2860 int start, end, domain;
2862 uschar *from_address =
2863 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2864 &start, &end, &domain, FALSE);
2865 uschar *generated_sender_address;
2867 if (submission_mode)
2869 if (submission_domain == NULL)
2871 generated_sender_address = string_sprintf("%s@%s",
2872 local_part_quote(authenticated_id), qualify_domain_sender);
2874 else if (submission_domain[0] == 0) /* empty => full address */
2876 generated_sender_address = string_sprintf("%s",
2881 generated_sender_address = string_sprintf("%s@%s",
2882 local_part_quote(authenticated_id), submission_domain);
2886 generated_sender_address = string_sprintf("%s@%s",
2887 local_part_quote(originator_login), qualify_domain_sender);
2889 /* Remove permitted prefixes and suffixes from the local part of the From:
2890 address before doing the comparison with the generated sender. */
2892 if (from_address != NULL)
2895 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2897 if (at != NULL) *at = 0;
2898 from_address += route_check_prefix(from_address, local_from_prefix);
2899 slen = route_check_suffix(from_address, local_from_suffix);
2902 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2903 from_address += slen;
2905 if (at != NULL) *at = '@';
2907 if (strcmpic(generated_sender_address, from_address) == 0 ||
2908 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2909 make_sender = FALSE;
2912 /* We have to cause the Sender header to be rewritten if there are
2913 appropriate rewriting rules. */
2917 if (submission_mode && submission_name == NULL)
2918 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2919 generated_sender_address);
2921 header_add(htype_sender, "%sSender: %s <%s>\n",
2923 submission_mode? submission_name : originator_name,
2924 generated_sender_address);
2927 /* Ensure that a non-null envelope sender address corresponds to the
2928 submission mode sender address. */
2930 if (submission_mode && sender_address[0] != 0)
2932 if (sender_address_unrewritten == NULL)
2933 sender_address_unrewritten = sender_address;
2934 sender_address = generated_sender_address;
2935 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2936 log_write(L_address_rewrite, LOG_MAIN,
2937 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2938 sender_address_unrewritten, generated_sender_address);
2942 /* If there are any rewriting rules, apply them to the sender address, unless
2943 it has already been rewritten as part of verification for SMTP input. */
2945 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2946 sender_address[0] != 0)
2948 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2949 global_rewrite_rules, rewrite_existflags);
2950 DEBUG(D_receive|D_rewrite)
2951 debug_printf("rewritten sender = %s\n", sender_address);
2955 /* The headers must be run through rewrite_header(), because it ensures that
2956 addresses are fully qualified, as well as applying any rewriting rules that may
2959 Qualification of header addresses in a message from a remote host happens only
2960 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2961 appropriate. For local messages, qualification always happens, unless -bnq is
2962 used to explicitly suppress it. No rewriting is done for an unqualified address
2963 that is left untouched.
2965 We start at the second header, skipping our own Received:. This rewriting is
2966 documented as happening *after* recipient addresses are taken from the headers
2967 by the -t command line option. An added Sender: gets rewritten here. */
2969 for (h = header_list->next; h; h = h->next)
2971 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2972 rewrite_existflags, TRUE);
2977 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2978 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2979 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2980 exists, this applies to the set of resent- headers rather than the normal set.
2982 The requirement for a recipient header has been removed in RFC 2822. At this
2983 point in the code, earlier versions of Exim added a To: header for locally
2984 submitted messages, and an empty Bcc: header for others. In the light of the
2985 changes in RFC 2822, this was dropped in November 2003. */
2988 /* If there is no date header, generate one if the message originates locally
2989 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2990 submission mode flag is set. Messages without Date: are not valid, but it seems
2991 to be more confusing if Exim adds one to all remotely-originated messages.
2992 As per Message-Id, we prepend if resending, else append.
2995 if (!date_header_exists &&
2996 ((sender_host_address == NULL && !suppress_local_fixups)
2997 || submission_mode))
2998 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2999 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3001 search_tidyup(); /* Free any cached resources */
3003 /* Show the complete set of headers if debugging. Note that the first one (the
3004 new Received:) has not yet been set. */
3008 debug_printf(">>Headers after rewriting and local additions:\n");
3009 for (h = header_list->next; h != NULL; h = h->next)
3010 debug_printf("%c %s", h->type, h->text);
3014 /* The headers are now complete in store. If we are running in filter
3015 testing mode, that is all this function does. Return TRUE if the message
3016 ended with a dot. */
3018 if (filter_test != FTEST_NONE)
3020 process_info[process_info_len] = 0;
3021 return message_ended == END_DOT;
3024 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3025 think more if it could be handled. Cannot do onward CHUNKING unless
3026 inbound is, but inbound chunking ought to be ok with outbound plain.
3027 Could we do onward CHUNKING given inbound CHUNKING?
3029 if (chunking_state > CHUNKING_OFFERED)
3030 cancel_cutthrough_connection(FALSE, US"chunking active");
3032 /* Cutthrough delivery:
3033 We have to create the Received header now rather than at the end of reception,
3034 so the timestamp behaviour is a change to the normal case.
3035 Having created it, send the headers to the destination. */
3037 if (cutthrough.fd >= 0 && cutthrough.delivery)
3039 if (received_count > received_headers_max)
3041 cancel_cutthrough_connection(TRUE, US"too many headers");
3042 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3043 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3044 "Too many \"Received\" headers",
3046 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3047 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3048 message_id[0] = 0; /* Indicate no message accepted */
3049 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3050 goto TIDYUP; /* Skip to end of function */
3052 received_header_gen();
3053 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3054 (void) cutthrough_headers_send();
3058 /* Open a new spool file for the data portion of the message. We need
3059 to access it both via a file descriptor and a stream. Try to make the
3060 directory if it isn't there. */
3062 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3063 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3065 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3067 if (errno == ENOENT)
3069 (void) directory_make(spool_directory,
3070 spool_sname(US"input", message_subdir),
3071 INPUT_DIRECTORY_MODE, TRUE);
3072 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3075 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3076 spool_name, strerror(errno));
3079 /* Make sure the file's group is the Exim gid, and double-check the mode
3080 because the group setting doesn't always get set automatically. */
3082 if (fchown(data_fd, exim_uid, exim_gid))
3083 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3084 "Failed setting ownership on spool file %s: %s",
3085 spool_name, strerror(errno));
3086 (void)fchmod(data_fd, SPOOL_MODE);
3088 /* We now have data file open. Build a stream for it and lock it. We lock only
3089 the first line of the file (containing the message ID) because otherwise there
3090 are problems when Exim is run under Cygwin (I'm told). See comments in
3091 spool_in.c, where the same locking is done. */
3093 data_file = fdopen(data_fd, "w+");
3094 lock_data.l_type = F_WRLCK;
3095 lock_data.l_whence = SEEK_SET;
3096 lock_data.l_start = 0;
3097 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3099 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3100 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3101 errno, strerror(errno));
3103 /* We have an open, locked data file. Write the message id to it to make it
3104 self-identifying. Then read the remainder of the input of this message and
3105 write it to the data file. If the variable next != NULL, it contains the first
3106 data line (which was read as a header but then turned out not to have the right
3107 format); write it (remembering that it might contain binary zeros). The result
3108 of fwrite() isn't inspected; instead we call ferror() below. */
3110 fprintf(data_file, "%s-D\n", message_id);
3113 uschar *s = next->text;
3114 int len = next->slen;
3115 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3116 body_linecount++; /* Assumes only 1 line */
3119 /* Note that we might already be at end of file, or the logical end of file
3120 (indicated by '.'), or might have encountered an error while writing the
3121 message id or "next" line. */
3123 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3127 message_ended = chunking_state <= CHUNKING_OFFERED
3128 ? read_message_data_smtp(data_file)
3130 ? read_message_bdat_smtp_wire(data_file)
3131 : read_message_bdat_smtp(data_file);
3132 receive_linecount++; /* The terminating "." line */
3134 else message_ended = read_message_data(data_file);
3136 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3137 message_linecount += body_linecount;
3139 switch (message_ended)
3141 /* Handle premature termination of SMTP */
3146 Uunlink(spool_name); /* Lose data file when closed */
3147 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3148 message_id[0] = 0; /* Indicate no message accepted */
3149 smtp_reply = handle_lost_connection(US"");
3151 goto TIDYUP; /* Skip to end of function */
3155 /* Handle message that is too big. Don't use host_or_ident() in the log
3156 message; we want to see the ident value even for non-remote messages. */
3159 Uunlink(spool_name); /* Lose the data file when closed */
3160 cancel_cutthrough_connection(TRUE, US"mail too big");
3161 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3163 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3164 "message too big: read=%d max=%d",
3166 (sender_fullhost == NULL)? "" : " H=",
3167 (sender_fullhost == NULL)? US"" : sender_fullhost,
3168 (sender_ident == NULL)? "" : " U=",
3169 (sender_ident == NULL)? US"" : sender_ident,
3171 thismessage_size_limit);
3175 smtp_reply = US"552 Message size exceeds maximum permitted";
3176 message_id[0] = 0; /* Indicate no message accepted */
3177 goto TIDYUP; /* Skip to end of function */
3181 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3182 give_local_error(ERRMESS_TOOBIG,
3183 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3184 US"message rejected: ", error_rc, data_file, header_list);
3185 /* Does not return */
3189 /* Handle bad BDAT protocol sequence */
3192 Uunlink(spool_name); /* Lose the data file when closed */
3193 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3194 smtp_reply = US""; /* Response already sent */
3195 message_id[0] = 0; /* Indicate no message accepted */
3196 goto TIDYUP; /* Skip to end of function */
3200 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3201 example, there may be some expansion in an ACL that uses a timer.) */
3203 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3205 /* The message body has now been read into the data file. Call fflush() to
3206 empty the buffers in C, and then call fsync() to get the data written out onto
3207 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3208 having to do this). If there was an I/O error on either input or output,
3209 attempt to send an error message, and unlink the spool file. For non-SMTP input
3210 we can then give up. Note that for SMTP input we must swallow the remainder of
3211 the input in cases of output errors, since the far end doesn't expect to see
3212 anything until the terminating dot line is sent. */
3214 if (fflush(data_file) == EOF || ferror(data_file) ||
3215 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3217 uschar *msg_errno = US strerror(errno);
3218 BOOL input_error = (receive_ferror)() != 0;
3219 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3220 input_error? "Input read" : "Spool write",
3222 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3224 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3225 Uunlink(spool_name); /* Lose the data file */
3226 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3231 smtp_reply = US"451 Error while reading input data";
3234 smtp_reply = US"451 Error while writing spool file";
3235 receive_swallow_smtp();
3237 message_id[0] = 0; /* Indicate no message accepted */
3238 goto TIDYUP; /* Skip to end of function */
3243 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3244 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3246 /* Does not return */
3251 /* No I/O errors were encountered while writing the data file. */
3253 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3256 /* If there were any bad addresses extracted by -t, or there were no recipients
3257 left after -t, send a message to the sender of this message, or write it to
3258 stderr if the error handling option is set that way. Note that there may
3259 legitimately be no recipients for an SMTP message if they have all been removed
3262 We need to rewind the data file in order to read it. In the case of no
3263 recipients or stderr error writing, throw the data file away afterwards, and
3264 exit. (This can't be SMTP, which always ensures there's at least one
3265 syntactically good recipient address.) */
3267 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3271 if (recipients_count == 0) debug_printf("*** No recipients\n");
3272 if (bad_addresses != NULL)
3274 error_block *eblock = bad_addresses;
3275 debug_printf("*** Bad address(es)\n");
3276 while (eblock != NULL)
3278 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3279 eblock = eblock->next;
3284 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3286 /* If configured to send errors to the sender, but this fails, force
3287 a failure error code. We use a special one for no recipients so that it
3288 can be detected by the autoreply transport. Otherwise error_rc is set to
3289 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3290 it is EXIT_SUCCESS. */
3292 if (error_handling == ERRORS_SENDER)
3294 if (!moan_to_sender(
3295 (bad_addresses == NULL)?
3296 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3297 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3298 bad_addresses, header_list, data_file, FALSE))
3299 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3303 if (bad_addresses == NULL)
3305 if (extracted_ignored)
3306 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3308 fprintf(stderr, "exim: no recipients in message\n");
3312 fprintf(stderr, "exim: invalid address%s",
3313 (bad_addresses->next == NULL)? ":" : "es:\n");
3314 while (bad_addresses != NULL)
3316 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3317 bad_addresses->text2);
3318 bad_addresses = bad_addresses->next;
3323 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3325 Uunlink(spool_name);
3326 (void)fclose(data_file);
3327 exim_exit(error_rc);
3331 /* Data file successfully written. Generate text for the Received: header by
3332 expanding the configured string, and adding a timestamp. By leaving this
3333 operation till now, we ensure that the timestamp is the time that message
3334 reception was completed. However, this is deliberately done before calling the
3335 data ACL and local_scan().
3337 This Received: header may therefore be inspected by the data ACL and by code in
3338 the local_scan() function. When they have run, we update the timestamp to be
3339 the final time of reception.
3341 If there is just one recipient, set up its value in the $received_for variable
3342 for use when we generate the Received: header.
3344 Note: the checking for too many Received: headers is handled by the delivery
3346 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3348 if (received_header->text == NULL) /* Non-cutthrough case */
3350 received_header_gen();
3352 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3354 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3355 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3357 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3358 now, before running the DATA ACL. */
3360 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3363 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3364 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3366 /* If an ACL is specified for checking things at this stage of reception of a
3367 message, run it, unless all the recipients were removed by "discard" in earlier
3368 ACLs. That is the only case in which recipients_count can be zero at this
3369 stage. Set deliver_datafile to point to the data file so that $message_body and
3370 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3373 deliver_datafile = data_fd;
3376 enable_dollar_recipients = TRUE;
3378 if (recipients_count == 0)
3379 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3383 /* Handle interactive SMTP messages */
3385 if (smtp_input && !smtp_batched_input)
3388 #ifndef DISABLE_DKIM
3389 if (!dkim_disable_verify)
3391 /* Finish verification, this will log individual signature results to
3393 dkim_exim_verify_finish();
3395 /* Check if we must run the DKIM ACL */
3396 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3398 uschar *dkim_verify_signers_expanded =
3399 expand_string(dkim_verify_signers);
3400 if (!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);
3408 const uschar *ptr = dkim_verify_signers_expanded;
3409 uschar *item = NULL;
3410 uschar *seen_items = NULL;
3411 int seen_items_size = 0;
3412 int seen_items_offset = 0;
3413 /* Default to OK when no items are present */
3415 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3417 /* Prevent running ACL for an empty item */
3418 if (!item || !*item) continue;
3420 /* Only run ACL once for each domain or identity,
3421 no matter how often it appears in the expanded list. */
3424 uschar *seen_item = NULL;
3425 const uschar *seen_items_list = seen_items;
3426 BOOL seen_this_item = FALSE;
3428 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3430 if (Ustrcmp(seen_item,item) == 0)
3432 seen_this_item = TRUE;
3439 debug_printf("acl_smtp_dkim: skipping signer %s, "
3440 "already seen\n", item);
3444 seen_items = string_append(seen_items, &seen_items_size,
3445 &seen_items_offset, 1, ":");
3448 seen_items = string_append(seen_items, &seen_items_size,
3449 &seen_items_offset, 1, item);
3450 seen_items[seen_items_offset] = '\0';
3453 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3456 dkim_exim_acl_setup(item);
3457 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3458 &user_msg, &log_msg);
3463 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3464 "skipping remaining items\n", rc, item);
3465 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3469 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3472 recipients_count = 0;
3473 blackholed_by = US"DKIM ACL";
3474 if (log_msg != NULL)
3475 blackhole_log_msg = string_sprintf(": %s", log_msg);
3479 Uunlink(spool_name);
3480 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3481 smtp_yield = FALSE; /* No more messages after dropped connection */
3482 smtp_reply = US""; /* Indicate reply already sent */
3483 message_id[0] = 0; /* Indicate no message accepted */
3484 goto TIDYUP; /* Skip to end of function */
3489 #endif /* DISABLE_DKIM */
3491 #ifdef WITH_CONTENT_SCAN
3492 if (recipients_count > 0 &&
3493 acl_smtp_mime != NULL &&
3494 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3496 #endif /* WITH_CONTENT_SCAN */
3498 #ifdef EXPERIMENTAL_DMARC
3499 dmarc_up = dmarc_store_data(from_header);
3500 #endif /* EXPERIMENTAL_DMARC */
3502 #ifndef DISABLE_PRDR
3503 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3507 int all_fail = FAIL;
3509 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3510 /* Loop through recipients, responses must be in same order received */
3511 for (c = 0; recipients_count > c; c++)
3513 uschar * addr= recipients_list[c].address;
3514 uschar * msg= US"PRDR R=<%s> %s";
3517 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3518 addr, c+1, recipients_count);
3519 rc = acl_check(ACL_WHERE_PRDR, addr,
3520 acl_smtp_data_prdr, &user_msg, &log_msg);
3522 /* If any recipient rejected content, indicate it in final message */
3524 /* If all recipients rejected, indicate in final message */
3529 case OK: case DISCARD: code = US"250"; break;
3530 case DEFER: code = US"450"; break;
3531 default: code = US"550"; break;
3533 if (user_msg != NULL)
3534 smtp_user_msg(code, user_msg);
3539 case OK: case DISCARD:
3540 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3542 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3544 msg = string_sprintf(CS msg, addr, "refusal"); break;
3546 smtp_user_msg(code, msg);
3548 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3549 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3550 else log_write(0, LOG_MAIN, "%s", CS msg);
3552 if (rc != OK) { receive_remove_recipient(addr); c--; }
3554 /* Set up final message, used if data acl gives OK */
3555 smtp_reply = string_sprintf("%s id=%s message %s",
3556 all_fail == FAIL ? US"550" : US"250",
3559 ? US"rejected for all recipients"
3562 : US"accepted for some recipients");
3563 if (recipients_count == 0)
3565 message_id[0] = 0; /* Indicate no message accepted */
3570 prdr_requested = FALSE;
3571 #endif /* !DISABLE_PRDR */
3573 /* Check the recipients count again, as the MIME ACL might have changed
3576 if (acl_smtp_data != NULL && recipients_count > 0)
3578 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3579 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3582 recipients_count = 0;
3583 blackholed_by = US"DATA ACL";
3585 blackhole_log_msg = string_sprintf(": %s", log_msg);
3586 cancel_cutthrough_connection(TRUE, US"data acl discard");
3590 Uunlink(spool_name);
3591 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3592 #ifdef WITH_CONTENT_SCAN
3595 #ifdef EXPERIMENTAL_DCC
3598 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3599 smtp_yield = FALSE; /* No more messages after dropped connection */
3600 smtp_reply = US""; /* Indicate reply already sent */
3601 message_id[0] = 0; /* Indicate no message accepted */
3602 goto TIDYUP; /* Skip to end of function */
3607 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3608 we cannot take different actions for permanent and temporary rejections. */
3613 #ifdef WITH_CONTENT_SCAN
3614 if (acl_not_smtp_mime != NULL &&
3615 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3618 #endif /* WITH_CONTENT_SCAN */
3620 if (acl_not_smtp != NULL)
3622 uschar *user_msg, *log_msg;
3623 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3626 recipients_count = 0;
3627 blackholed_by = US"non-SMTP ACL";
3628 if (log_msg != NULL)
3629 blackhole_log_msg = string_sprintf(": %s", log_msg);
3633 Uunlink(spool_name);
3634 #ifdef WITH_CONTENT_SCAN
3637 #ifdef EXPERIMENTAL_DCC
3640 /* The ACL can specify where rejections are to be logged, possibly
3641 nowhere. The default is main and reject logs. */
3643 if (log_reject_target != 0)
3644 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3645 sender_address, log_msg);
3647 if (user_msg == NULL) user_msg = US"local configuration problem";
3648 if (smtp_batched_input)
3650 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3651 /* Does not return */
3655 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3656 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3657 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3659 /* Does not return */
3662 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3666 /* The applicable ACLs have been run */
3668 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3669 if (queue_only_policy) queued_by = US"ACL";
3672 #ifdef WITH_CONTENT_SCAN
3676 #ifdef EXPERIMENTAL_DCC
3681 /* The final check on the message is to run the scan_local() function. The
3682 version supplied with Exim always accepts, but this is a hook for sysadmins to
3683 supply their own checking code. The local_scan() function is run even when all
3684 the recipients have been discarded. */
3685 /*XXS could we avoid this for the standard case, given that few people will use it? */
3687 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3689 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3690 deleted, and the incident gets logged. */
3692 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3693 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3694 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3695 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3697 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3698 local_scan_timeout);
3699 local_scan_data = NULL;
3701 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3702 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3703 rc = local_scan(data_fd, &local_scan_data);
3705 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3707 enable_dollar_recipients = FALSE;
3709 store_pool = POOL_MAIN; /* In case changed */
3710 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3713 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3714 os_non_restarting_signal(SIGFPE, SIG_DFL);
3715 os_non_restarting_signal(SIGILL, SIG_DFL);
3716 os_non_restarting_signal(SIGBUS, SIG_DFL);
3718 /* The length check is paranoia against some runaway code, and also because
3719 (for a success return) lines in the spool file are read into big_buffer. */
3721 if (local_scan_data != NULL)
3723 int len = Ustrlen(local_scan_data);
3724 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3725 local_scan_data = string_copyn(local_scan_data, len);
3728 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3730 if (!deliver_freeze) /* ACL might have already frozen */
3732 deliver_freeze = TRUE;
3733 deliver_frozen_at = time(NULL);
3734 frozen_by = US"local_scan()";
3736 rc = LOCAL_SCAN_ACCEPT;
3738 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3740 if (!queue_only_policy) /* ACL might have already queued */
3742 queue_only_policy = TRUE;
3743 queued_by = US"local_scan()";
3745 rc = LOCAL_SCAN_ACCEPT;
3748 /* Message accepted: remove newlines in local_scan_data because otherwise
3749 the spool file gets corrupted. Ensure that all recipients are qualified. */
3751 if (rc == LOCAL_SCAN_ACCEPT)
3753 if (local_scan_data != NULL)
3756 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3758 for (i = 0; i < recipients_count; i++)
3760 recipient_item *r = recipients_list + i;
3761 r->address = rewrite_address_qualify(r->address, TRUE);
3762 if (r->errors_to != NULL)
3763 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3765 if (recipients_count == 0 && blackholed_by == NULL)
3766 blackholed_by = US"local_scan";
3769 /* Message rejected: newlines permitted in local_scan_data to generate
3770 multiline SMTP responses. */
3774 uschar *istemp = US"";
3780 errmsg = local_scan_data;
3782 Uunlink(spool_name); /* Cancel this message */
3786 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3787 "rejection given", rc);
3790 case LOCAL_SCAN_REJECT_NOLOGHDR:
3791 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3794 case LOCAL_SCAN_REJECT:
3795 smtp_code = US"550";
3796 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3799 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3800 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3803 case LOCAL_SCAN_TEMPREJECT:
3805 smtp_code = US"451";
3806 if (errmsg == NULL) errmsg = US"Temporary local problem";
3807 istemp = US"temporarily ";
3811 s = string_append(s, &size, &sptr, 2, US"F=",
3812 (sender_address[0] == 0)? US"<>" : sender_address);
3813 s = add_host_info_for_log(s, &size, &sptr);
3816 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3817 s, istemp, string_printing(errmsg));
3821 if (!smtp_batched_input)
3823 smtp_respond(smtp_code, 3, TRUE, errmsg);
3824 message_id[0] = 0; /* Indicate no message accepted */
3825 smtp_reply = US""; /* Indicate reply already sent */
3826 goto TIDYUP; /* Skip to end of function */
3830 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3831 /* Does not return */
3836 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3837 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3838 US"message rejected by local scan code: ", error_rc, data_file,
3840 /* Does not return */
3844 /* Reset signal handlers to ignore signals that previously would have caused
3845 the message to be abandoned. */
3847 signal(SIGTERM, SIG_IGN);
3848 signal(SIGINT, SIG_IGN);
3851 /* Ensure the first time flag is set in the newly-received message. */
3853 deliver_firsttime = TRUE;
3855 #ifdef EXPERIMENTAL_BRIGHTMAIL
3857 { /* rewind data file */
3858 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3859 bmi_verdicts = bmi_process_message(header_list, data_fd);
3863 /* Update the timestamp in our Received: header to account for any time taken by
3864 an ACL or by local_scan(). The new time is the time that all reception
3865 processing is complete. */
3867 timestamp = expand_string(US"${tod_full}");
3868 tslen = Ustrlen(timestamp);
3870 memcpy(received_header->text + received_header->slen - tslen - 1,
3873 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3877 deliver_freeze = FALSE;
3878 queue_only_policy = FALSE;
3881 /* Keep the data file open until we have written the header file, in order to
3882 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3883 don't write the header file, and we unlink the data file. If writing the header
3884 file fails, we have failed to accept this message. */
3886 if (host_checking || blackholed_by != NULL)
3889 Uunlink(spool_name);
3890 msg_size = 0; /* Compute size for log line */
3891 for (h = header_list; h != NULL; h = h->next)
3892 if (h->type != '*') msg_size += h->slen;
3895 /* Write the -H file */
3898 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3900 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3901 Uunlink(spool_name); /* Lose the data file */
3905 smtp_reply = US"451 Error in writing spool file";
3906 message_id[0] = 0; /* Indicate no message accepted */
3911 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3912 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3914 /* Does not return */
3919 /* The message has now been successfully received. */
3921 receive_messagecount++;
3923 /* In SMTP sessions we may receive several in one connection. After each one,
3924 we wait for the clock to tick at the level of message-id granularity. This is
3925 so that the combination of time+pid is unique, even on systems where the pid
3926 can be re-used within our time interval. We can't shorten the interval without
3927 re-designing the message-id. See comments above where the message id is
3928 created. This is Something For The Future. */
3930 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3931 exim_wait_tick(&message_id_tv, id_resolution);
3933 /* Add data size to written header size. We do not count the initial file name
3934 that is in the file, but we do add one extra for the notional blank line that
3935 precedes the data. This total differs from message_size in that it include the
3936 added Received: header and any other headers that got created locally. */
3939 fstat(data_fd, &statbuf);
3941 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3943 /* Generate a "message received" log entry. We do this by building up a dynamic
3944 string as required. Since we commonly want to add two items at a time, use a
3945 macro to simplify the coding. We log the arrival of a new message while the
3946 file is still locked, just in case the machine is *really* fast, and delivers
3947 it first! Include any message id that is in the message - since the syntax of a
3948 message id is actually an addr-spec, we can use the parse routine to canonicalize
3953 s = store_get(size);
3955 s = string_append(s, &size, &sptr, 2,
3956 fake_response == FAIL ? US"(= " : US"<= ",
3957 sender_address[0] == 0 ? US"<>" : sender_address);
3958 if (message_reference)
3959 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3961 s = add_host_info_for_log(s, &size, &sptr);
3964 if (LOGGING(tls_cipher) && tls_in.cipher)
3965 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3966 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3967 s = string_append(s, &size, &sptr, 2, US" CV=",
3968 tls_in.certificate_verified ? "yes":"no");
3969 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3970 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3971 string_printing(tls_in.peerdn), US"\"");
3972 if (LOGGING(tls_sni) && tls_in.sni)
3973 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3974 string_printing(tls_in.sni), US"\"");
3977 if (sender_host_authenticated)
3979 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3980 if (authenticated_id)
3982 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3983 if (LOGGING(smtp_mailauth) && authenticated_sender)
3984 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3988 #ifndef DISABLE_PRDR
3990 s = string_catn(s, &size, &sptr, US" PRDR", 5);
3993 #ifdef SUPPORT_PROXY
3994 if (proxy_session && LOGGING(proxy))
3995 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3998 if (chunking_state > CHUNKING_OFFERED)
3999 s = string_catn(s, &size, &sptr, US" K", 2);
4001 sprintf(CS big_buffer, "%d", msg_size);
4002 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
4004 /* log 8BITMIME mode announced in MAIL_FROM
4008 if (LOGGING(8bitmime))
4010 sprintf(CS big_buffer, "%d", body_8bitmime);
4011 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
4015 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
4017 /* If an addr-spec in a message-id contains a quoted string, it can contain
4018 any characters except " \ and CR and so in particular it can contain NL!
4019 Therefore, make sure we use a printing-characters only version for the log.
4020 Also, allow for domain literals in the message id. */
4025 BOOL save_allow_domain_literals = allow_domain_literals;
4026 allow_domain_literals = TRUE;
4027 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4028 &errmsg, &start, &end, &domain, FALSE);
4029 allow_domain_literals = save_allow_domain_literals;
4031 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
4034 /* If subject logging is turned on, create suitable printing-character
4035 text. By expanding $h_subject: we make use of the MIME decoding. */
4037 if (LOGGING(subject) && subject_header != NULL)
4040 uschar *p = big_buffer;
4041 uschar *ss = expand_string(US"$h_subject:");
4043 /* Backslash-quote any double quotes or backslashes so as to make a
4044 a C-like string, and turn any non-printers into escape sequences. */
4047 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4049 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4054 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
4057 /* Terminate the string: string_cat() and string_append() leave room, but do
4058 not put the zero in. */
4062 /* Create a message log file if message logs are being used and this message is
4063 not blackholed. Write the reception stuff to it. We used to leave message log
4064 creation until the first delivery, but this has proved confusing for some
4067 if (message_logs && blackholed_by == NULL)
4071 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4073 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4077 (void)directory_make(spool_directory,
4078 spool_sname(US"msglog", message_subdir),
4079 MSGLOG_DIRECTORY_MODE, TRUE);
4080 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4085 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4086 spool_name, strerror(errno));
4091 FILE *message_log = fdopen(fd, "a");
4092 if (message_log == NULL)
4094 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4095 spool_name, strerror(errno));
4100 uschar *now = tod_stamp(tod_log);
4101 fprintf(message_log, "%s Received from %s\n", now, s+3);
4102 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4104 if (queue_only_policy) fprintf(message_log,
4105 "%s no immediate delivery: queued%s%s by %s\n", now,
4106 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4108 (void)fclose(message_log);
4113 /* Everything has now been done for a successful message except logging its
4114 arrival, and outputting an SMTP response. While writing to the log, set a flag
4115 to cause a call to receive_bomb_out() if the log cannot be opened. */
4117 receive_call_bombout = TRUE;
4119 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4120 connection has gone away. This can only be done if there is no unconsumed input
4121 waiting in the local input buffer. We can test for this by calling
4122 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4123 input to be sent following the final dot, so the presence of following input is
4126 If the connection is still present, but there is no unread input for the
4127 socket, the result of a select() call will be zero. If, however, the connection
4128 has gone away, or if there is pending input, the result of select() will be
4129 non-zero. The two cases can be distinguished by trying to read the next input
4130 character. If we succeed, we can unread it so that it remains in the local
4131 buffer for handling later. If not, the connection has been lost.
4133 Of course, since TCP/IP is asynchronous, there is always a chance that the
4134 connection will vanish between the time of this test and the sending of the
4135 response, but the chance of this happening should be small. */
4137 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4138 !receive_smtp_buffered())
4141 fd_set select_check;
4142 FD_ZERO(&select_check);
4143 FD_SET(fileno(smtp_in), &select_check);
4147 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4149 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4150 if (c != EOF) (receive_ungetc)(c); else
4152 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4153 smtp_reply = US""; /* No attempt to send a response */
4154 smtp_yield = FALSE; /* Nothing more on this connection */
4156 /* Re-use the log line workspace */
4159 s = string_cat(s, &size, &sptr, US"SMTP connection lost after final dot");
4160 s = add_host_info_for_log(s, &size, &sptr);
4162 log_write(0, LOG_MAIN, "%s", s);
4164 /* Delete the files for this aborted message. */
4166 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4167 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4168 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4175 /* The connection has not gone away; we really are going to take responsibility
4176 for this message. */
4178 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4181 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4182 the sender's dot (below).
4183 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4184 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4185 in which case pass temp-reject back to initiator and dump the files.
4187 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4189 XXX We do not handle queue-only, freezing, or blackholes.
4191 if(cutthrough.fd >= 0 && cutthrough.delivery)
4193 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4194 /* Logging was done in finaldot() */
4197 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4198 cutthrough_done = ACCEPTED;
4199 break; /* message_id needed for SMTP accept below */
4201 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4202 ... for which, pass back the exact error */
4203 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4206 default: /* Unknown response, or error. Treat as temp-reject. */
4207 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4208 break; /* message_id needed for SMTP accept below */
4210 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4211 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4212 cutthrough_done = PERM_REJ;
4217 #ifndef DISABLE_PRDR
4218 if(!smtp_reply || prdr_requested)
4223 log_write(0, LOG_MAIN |
4224 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4225 (LOGGING(received_sender)? LOG_SENDER : 0),
4228 /* Log any control actions taken by an ACL or local_scan(). */
4230 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4231 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4232 "no immediate delivery: queued%s%s by %s",
4233 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4236 receive_call_bombout = FALSE;
4238 store_reset(s); /* The store for the main log message can be reused */
4240 /* If the message is frozen, and freeze_tell is set, do the telling. */
4242 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4244 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4245 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4246 message_id, frozen_by, sender_address);
4250 /* Either a message has been successfully received and written to the two spool
4251 files, or an error in writing the spool has occurred for an SMTP message, or
4252 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4253 we will have already given up because there's no point in carrying on!) In
4254 either event, we must now close (and thereby unlock) the data file. In the
4255 successful case, this leaves the message on the spool, ready for delivery. In
4256 the error case, the spool file will be deleted. Then tidy up store, interact
4257 with an SMTP call if necessary, and return.
4259 A fflush() was done earlier in the expectation that any write errors on the
4260 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4261 possible for fclose() to fail - but what to do? What has happened to the lock
4266 process_info[process_info_len] = 0; /* Remove message id */
4267 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4269 /* Now reset signal handlers to their defaults */
4271 signal(SIGTERM, SIG_DFL);
4272 signal(SIGINT, SIG_DFL);
4274 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4275 value, which defaults TRUE - meaning there may be more incoming messages from
4276 this connection. For non-SMTP callers (where there is only ever one message),
4277 the default is FALSE. */
4283 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4284 is set to the response that should be sent. When it is NULL, we generate
4285 default responses. After an ACL error or local_scan() error, the response has
4286 already been sent, and smtp_reply is an empty string to indicate this. */
4288 if (!smtp_batched_input)
4292 if (fake_response != OK)
4293 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4294 3, TRUE, fake_response_text);
4296 /* An OK response is required; use "message" text if present. */
4300 uschar *code = US"250";
4302 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4303 smtp_respond(code, len, TRUE, user_msg);
4306 /* Default OK response */
4308 else if (chunking_state > CHUNKING_OFFERED)
4310 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4311 chunking_datasize, message_size+message_linecount, message_id);
4312 chunking_state = CHUNKING_OFFERED;
4315 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4319 "\n**** SMTP testing: that is not a real message id!\n\n");
4322 /* smtp_reply is set non-empty */
4324 else if (smtp_reply[0] != 0)
4325 if (fake_response != OK && (smtp_reply[0] == '2'))
4326 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4327 fake_response_text);
4329 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4331 switch (cutthrough_done)
4334 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4336 /* Delete spool files */
4337 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4338 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4339 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4343 if (cutthrough.defer_pass)
4345 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4346 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4347 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4352 if (cutthrough_done != NOT_TRIED)
4354 message_id[0] = 0; /* Prevent a delivery from starting */
4355 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4356 cutthrough.defer_pass = FALSE;
4360 /* For batched SMTP, generate an error message on failure, and do
4361 nothing on success. The function moan_smtp_batch() does not return -
4362 it exits from the program with a non-zero return code. */
4364 else if (smtp_reply)
4365 moan_smtp_batch(NULL, "%s", smtp_reply);
4369 /* If blackholing, we can immediately log this message's sad fate. The data
4370 file has already been unlinked, and the header file was never written to disk.
4371 We must now indicate that nothing was received, to prevent a delivery from
4376 const uschar *detail = local_scan_data
4377 ? string_printing(local_scan_data)
4378 : string_sprintf("(%s discarded recipients)", blackholed_by);
4379 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4380 log_write(0, LOG_MAIN, "Completed");
4384 /* Reset headers so that logging of rejects for a subsequent message doesn't
4385 include them. It is also important to set header_last = NULL before exiting
4386 from this function, as this prevents certain rewrites that might happen during
4387 subsequent verifying (of another incoming message) from trying to add headers
4388 when they shouldn't. */
4390 header_list = header_last = NULL;
4392 return yield; /* TRUE if more messages (SMTP only) */
4395 /* End of receive.c */