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
1295 Returns: the extended string
1299 add_host_info_for_log(gstring * g)
1301 if (sender_fullhost)
1303 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1304 g = string_catn(g, US" DS", 3);
1305 g = string_append(g, 2, US" H=", sender_fullhost);
1306 if (LOGGING(incoming_interface) && interface_address != NULL)
1309 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1312 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1314 g = string_catn(g, US" TFO", 4);
1315 tcp_in_fastopen_logged = TRUE;
1318 g = string_append(g, 2, US" U=", sender_ident);
1319 if (received_protocol)
1320 g = string_append(g, 2, US" P=", received_protocol);
1326 #ifdef WITH_CONTENT_SCAN
1328 /*************************************************
1329 * Run the MIME ACL on a message *
1330 *************************************************/
1332 /* This code is in a subroutine so that it can be used for both SMTP
1333 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1336 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1337 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1338 smtp_reply_ptr Where SMTP reply is being built
1339 blackholed_by_ptr Where "blackholed by" message is being built
1341 Returns: TRUE to carry on; FALSE to abandon the message
1345 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1346 uschar **blackholed_by_ptr)
1349 uschar rfc822_file_path[2048];
1350 unsigned long mbox_size;
1351 header_line *my_headerlist;
1352 uschar *user_msg, *log_msg;
1353 int mime_part_count_buffer = -1;
1354 uschar * mbox_filename;
1357 memset(CS rfc822_file_path,0,2048);
1359 /* check if it is a MIME message */
1361 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1362 if ( my_headerlist->type != '*' /* skip deleted headers */
1363 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1366 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1370 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1375 /* make sure the eml mbox file is spooled up */
1376 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1377 { /* error while spooling */
1378 log_write(0, LOG_MAIN|LOG_PANIC,
1379 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1380 Uunlink(spool_name);
1382 #ifdef EXPERIMENTAL_DCC
1385 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1386 message_id[0] = 0; /* Indicate no message accepted */
1387 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1388 return FALSE; /* Indicate skip to end of receive function */
1394 mime_part_count = -1;
1395 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1396 (void)fclose(mbox_file);
1398 if (Ustrlen(rfc822_file_path) > 0)
1400 mime_part_count = mime_part_count_buffer;
1402 if (unlink(CS rfc822_file_path) == -1)
1404 log_write(0, LOG_PANIC,
1405 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1410 /* check if we must check any message/rfc822 attachments */
1414 struct dirent * entry;
1417 scandir = string_copyn(mbox_filename, Ustrrchr(mbox_filename, '/') - mbox_filename);
1419 tempdir = opendir(CS scandir);
1422 if (!(entry = readdir(tempdir)))
1424 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1426 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1427 "%s/%s", scandir, entry->d_name);
1428 DEBUG(D_receive) debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1437 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1439 /* set RFC822 expansion variable */
1441 mime_part_count_buffer = mime_part_count;
1442 goto MIME_ACL_CHECK;
1444 log_write(0, LOG_PANIC,
1445 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1446 unlink(CS rfc822_file_path);
1451 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1454 recipients_count = 0;
1455 *blackholed_by_ptr = US"MIME ACL";
1459 Uunlink(spool_name);
1461 #ifdef EXPERIMENTAL_DCC
1465 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1467 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1468 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1470 message_id[0] = 0; /* Indicate no message accepted */
1471 return FALSE; /* Cause skip to end of receive function */
1477 #endif /* WITH_CONTENT_SCAN */
1482 received_header_gen(void)
1486 header_line *received_header= header_list;
1488 timestamp = expand_string(US"${tod_full}");
1489 if (recipients_count == 1) received_for = recipients_list[0].address;
1490 received = expand_string(received_header_text);
1491 received_for = NULL;
1495 if(spool_name[0] != 0)
1496 Uunlink(spool_name); /* Lose the data file */
1497 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1498 "(received_header_text) failed: %s", string_printing(received_header_text),
1499 expand_string_message);
1502 /* The first element on the header chain is reserved for the Received header,
1503 so all we have to do is fill in the text pointer, and set the type. However, if
1504 the result of the expansion is an empty string, we leave the header marked as
1505 "old" so as to refrain from adding a Received header. */
1507 if (received[0] == 0)
1509 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1510 received_header->type = htype_old;
1514 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1515 received_header->type = htype_received;
1518 received_header->slen = Ustrlen(received_header->text);
1520 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1521 received_header->type, received_header->text);
1526 /*************************************************
1528 *************************************************/
1530 /* Receive a message on the given input, and put it into a pair of spool files.
1531 Either a non-null list of recipients, or the extract flag will be true, or
1532 both. The flag sender_local is true for locally generated messages. The flag
1533 submission_mode is true if an ACL has obeyed "control = submission". The flag
1534 suppress_local_fixups is true if an ACL has obeyed "control =
1535 suppress_local_fixups" or -G was passed on the command-line.
1536 The flag smtp_input is true if the message is to be
1537 handled using SMTP conventions about termination and lines starting with dots.
1538 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1540 If a message was successfully read, message_id[0] will be non-zero.
1542 The general actions of this function are:
1544 . Read the headers of the message (if any) into a chain of store
1547 . If there is a "sender:" header and the message is locally originated,
1548 throw it away, unless the caller is trusted, or unless
1549 active_local_sender_retain is set - which can only happen if
1550 active_local_from_check is false.
1552 . If recipients are to be extracted from the message, build the
1553 recipients list from the headers, removing any that were on the
1554 original recipients list (unless extract_addresses_remove_arguments is
1555 false), and at the same time, remove any bcc header that may be present.
1557 . Get the spool file for the data, sort out its unique name, open
1558 and lock it (but don't give it the name yet).
1560 . Generate a "Message-Id" header if the message doesn't have one, for
1561 locally-originated messages.
1563 . Generate a "Received" header.
1565 . Ensure the recipients list is fully qualified and rewritten if necessary.
1567 . If there are any rewriting rules, apply them to the sender address
1568 and also to the headers.
1570 . If there is no from: header, generate one, for locally-generated messages
1571 and messages in "submission mode" only.
1573 . If the sender is local, check that from: is correct, and if not, generate
1574 a Sender: header, unless message comes from a trusted caller, or this
1575 feature is disabled by active_local_from_check being false.
1577 . If there is no "date" header, generate one, for locally-originated
1578 or submission mode messages only.
1580 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1581 dot_ends mode, to the data file. Leave it open, to hold the lock.
1583 . Write the envelope and the headers to a new file.
1585 . Set the name for the header file; close it.
1587 . Set the name for the data file; close it.
1589 Because this function can potentially be called many times in a single
1590 SMTP connection, all store should be got by store_get(), so that it will be
1591 automatically retrieved after the message is accepted.
1593 FUDGE: It seems that sites on the net send out messages with just LF
1594 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1595 we make the CRs optional in all cases.
1597 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1598 new regime is now in place in which bare CRs in header lines are turned into LF
1599 followed by a space, so as not to terminate the header line.
1601 February 2004: A bare LF in a header line in a message whose first line was
1602 terminated by CRLF is treated in the same way as a bare CR.
1605 extract_recip TRUE if recipients are to be extracted from the message's
1608 Returns: TRUE there are more messages to be read (SMTP input)
1609 FALSE there are no more messages to be read (non-SMTP input
1610 or SMTP connection collapsed, or other failure)
1612 When reading a message for filter testing, the returned value indicates
1613 whether the headers (which is all that is read) were terminated by '.' or
1617 receive_msg(BOOL extract_recip)
1622 int process_info_len = Ustrlen(process_info);
1623 int error_rc = (error_handling == ERRORS_SENDER)?
1624 errors_sender_rc : EXIT_FAILURE;
1625 int header_size = 256;
1626 int start, end, domain;
1629 int prevlines_length = 0;
1631 register int ptr = 0;
1633 BOOL contains_resent_headers = FALSE;
1634 BOOL extracted_ignored = FALSE;
1635 BOOL first_line_ended_crlf = TRUE_UNSET;
1636 BOOL smtp_yield = TRUE;
1639 BOOL resents_exist = FALSE;
1640 uschar *resent_prefix = US"";
1641 uschar *blackholed_by = NULL;
1642 uschar *blackhole_log_msg = US"";
1643 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1646 error_block *bad_addresses = NULL;
1648 uschar *frozen_by = NULL;
1649 uschar *queued_by = NULL;
1653 struct stat statbuf;
1655 /* Final message to give to SMTP caller, and messages from ACLs */
1657 uschar *smtp_reply = NULL;
1658 uschar *user_msg, *log_msg;
1660 /* Working header pointers */
1662 header_line *h, *next;
1664 /* Flags for noting the existence of certain headers (only one left) */
1666 BOOL date_header_exists = FALSE;
1668 /* Pointers to receive the addresses of headers whose contents we need. */
1670 header_line *from_header = NULL;
1671 header_line *subject_header = NULL;
1672 header_line *msgid_header = NULL;
1673 header_line *received_header;
1675 #ifdef EXPERIMENTAL_DMARC
1677 #endif /* EXPERIMENTAL_DMARC */
1679 /* Variables for use when building the Received: header. */
1684 /* Release any open files that might have been cached while preparing to
1685 accept the message - e.g. by verifying addresses - because reading a message
1686 might take a fair bit of real time. */
1690 /* Extracting the recipient list from an input file is incompatible with
1691 cutthrough delivery with the no-spool option. It shouldn't be possible
1692 to set up the combination, but just in case kill any ongoing connection. */
1693 if (extract_recip || !smtp_input)
1694 cancel_cutthrough_connection(TRUE, US"not smtp input");
1696 /* Initialize the chain of headers by setting up a place-holder for Received:
1697 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1698 pointing to the end of the chain to make adding headers simple. */
1700 received_header = header_list = header_last = store_get(sizeof(header_line));
1701 header_list->next = NULL;
1702 header_list->type = htype_old;
1703 header_list->text = NULL;
1704 header_list->slen = 0;
1706 /* Control block for the next header to be read. */
1708 next = store_get(sizeof(header_line));
1709 next->text = store_get(header_size);
1711 /* Initialize message id to be null (indicating no message read), and the
1712 header names list to be the normal list. Indicate there is no data file open
1713 yet, initialize the size and warning count, and deal with no size limit. */
1721 received_count = 1; /* For the one we will add */
1723 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1725 /* While reading the message, the following counts are computed. */
1727 message_linecount = body_linecount = body_zerocount =
1728 max_received_linelength = 0;
1730 #ifndef DISABLE_DKIM
1731 /* Call into DKIM to set up the context. In CHUNKING mode
1732 we clear the dot-stuffing flag */
1733 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1734 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1737 #ifdef EXPERIMENTAL_DMARC
1738 /* initialize libopendmarc */
1739 dmarc_up = dmarc_init();
1742 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1743 ids, and fractions of a second are required. See the comments that precede the
1744 message id creation below. */
1746 (void)gettimeofday(&message_id_tv, NULL);
1748 /* For other uses of the received time we can operate with granularity of one
1749 second, and for that we use the global variable received_time. This is for
1750 things like ultimate message timeouts.XXX */
1752 received_time = message_id_tv;
1754 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1755 happen in the smtp_getc() function when it refills its buffer. */
1757 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1759 /* If not SMTP input, timeout happens only if configured, and we just set a
1760 single timeout for the whole message. */
1762 else if (receive_timeout > 0)
1764 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1765 alarm(receive_timeout);
1768 /* SIGTERM and SIGINT are caught always. */
1770 signal(SIGTERM, data_sigterm_sigint_handler);
1771 signal(SIGINT, data_sigterm_sigint_handler);
1773 /* Header lines in messages are not supposed to be very long, though when
1774 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1775 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1776 storing the header, and extend this as necessary using string_cat().
1778 To cope with total lunacies, impose an upper limit on the length of the header
1779 section of the message, as otherwise the store will fill up. We must also cope
1780 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1781 Folded header lines are joined into one string, leaving the '\n' characters
1782 inside them, so that writing them out reproduces the input.
1784 Loop for each character of each header; the next structure for chaining the
1785 header is set up already, with ptr the offset of the next character in
1790 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1792 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1793 SMTP must have a correct "." terminator. */
1795 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1797 smtp_reply = handle_lost_connection(US" (header)");
1799 goto TIDYUP; /* Skip to end of function */
1802 /* See if we are at the current header's size limit - there must be at least
1803 four bytes left. This allows for the new character plus a zero, plus two for
1804 extra insertions when we are playing games with dots and carriage returns. If
1805 we are at the limit, extend the text buffer. This could have been done
1806 automatically using string_cat() but because this is a tightish loop storing
1807 only one character at a time, we choose to do it inline. Normally
1808 store_extend() will be able to extend the block; only at the end of a big
1809 store block will a copy be needed. To handle the case of very long headers
1810 (and sometimes lunatic messages can have ones that are 100s of K long) we
1811 call store_release() for strings that have been copied - if the string is at
1812 the start of a block (and therefore the only thing in it, because we aren't
1813 doing any other gets), the block gets freed. We can only do this because we
1814 know there are no other calls to store_get() going on. */
1816 if (ptr >= header_size - 4)
1818 int oldsize = header_size;
1819 /* header_size += 256; */
1821 if (!store_extend(next->text, oldsize, header_size))
1823 uschar *newtext = store_get(header_size);
1824 memcpy(newtext, next->text, ptr);
1825 store_release(next->text);
1826 next->text = newtext;
1830 /* Cope with receiving a binary zero. There is dispute about whether
1831 these should be allowed in RFC 822 messages. The middle view is that they
1832 should not be allowed in headers, at least. Exim takes this attitude at
1833 the moment. We can't just stomp on them here, because we don't know that
1834 this line is a header yet. Set a flag to cause scanning later. */
1836 if (ch == 0) had_zero++;
1838 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1839 those from data files use just LF. Treat LF in local SMTP input as a
1840 terminator too. Treat EOF as a line terminator always. */
1842 if (ch == EOF) goto EOL;
1844 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1845 other MTAs accept this. We are therefore forced into this "liberalisation"
1846 too, so we accept LF as a line terminator whatever the source of the message.
1847 However, if the first line of the message ended with a CRLF, we treat a bare
1848 LF specially by inserting a white space after it to ensure that the header
1849 line is not terminated. */
1853 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1854 else if (first_line_ended_crlf) receive_ungetc(' ');
1858 /* This is not the end of the line. If this is SMTP input and this is
1859 the first character in the line and it is a "." character, ignore it.
1860 This implements the dot-doubling rule, though header lines starting with
1861 dots aren't exactly common. They are legal in RFC 822, though. If the
1862 following is CRLF or LF, this is the line that that terminates the
1863 entire message. We set message_ended to indicate this has happened (to
1864 prevent further reading), and break out of the loop, having freed the
1865 empty header, and set next = NULL to indicate no data line. */
1867 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1869 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1872 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1876 ch = '\r'; /* Revert to CR */
1881 message_ended = END_DOT;
1884 break; /* End character-reading loop */
1887 /* For non-SMTP input, the dot at the start of the line was really a data
1888 character. What is now in ch is the following character. We guaranteed
1889 enough space for this above. */
1893 next->text[ptr++] = '.';
1898 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1899 remember this case if this is the first line ending. */
1903 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1906 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1910 /* Otherwise, put back the character after CR, and turn the bare CR
1913 ch = (receive_ungetc)(ch);
1914 next->text[ptr++] = '\n';
1919 /* We have a data character for the header line. */
1921 next->text[ptr++] = ch; /* Add to buffer */
1922 message_size++; /* Total message size so far */
1924 /* Handle failure due to a humungously long header section. The >= allows
1925 for the terminating \n. Add what we have so far onto the headers list so
1926 that it gets reflected in any error message, and back up the just-read
1929 if (message_size >= header_maxsize)
1931 next->text[ptr] = 0;
1933 next->type = htype_other;
1935 header_last->next = next;
1938 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1939 "%s (more than %d characters): message abandoned",
1940 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1944 smtp_reply = US"552 Message header is ridiculously long";
1945 receive_swallow_smtp();
1946 goto TIDYUP; /* Skip to end of function */
1951 give_local_error(ERRMESS_VLONGHEADER,
1952 string_sprintf("message header longer than %d characters received: "
1953 "message not accepted", header_maxsize), US"", error_rc, stdin,
1955 /* Does not return */
1959 continue; /* With next input character */
1961 /* End of header line reached */
1965 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1967 receive_linecount++;
1968 message_linecount++;
1970 /* Keep track of maximum line length */
1972 if (ptr - prevlines_length > max_received_linelength)
1973 max_received_linelength = ptr - prevlines_length;
1974 prevlines_length = ptr + 1;
1976 /* Now put in the terminating newline. There is always space for
1977 at least two more characters. */
1979 next->text[ptr++] = '\n';
1982 /* A blank line signals the end of the headers; release the unwanted
1983 space and set next to NULL to indicate this. */
1992 /* There is data in the line; see if the next input character is a
1993 whitespace character. If it is, we have a continuation of this header line.
1994 There is always space for at least one character at this point. */
1998 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1999 if (nextch == ' ' || nextch == '\t')
2001 next->text[ptr++] = nextch;
2003 continue; /* Iterate the loop */
2005 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2006 else ch = EOF; /* Cause main loop to exit at end */
2009 /* We have got to the real line end. Terminate the string and release store
2010 beyond it. If it turns out to be a real header, internal binary zeros will
2011 be squashed later. */
2013 next->text[ptr] = 0;
2015 store_reset(next->text + ptr + 1);
2017 /* Check the running total size against the overall message size limit. We
2018 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2019 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2020 headers - the code to read the body will then also hit the buffer. */
2022 if (message_size > thismessage_size_limit) break;
2024 /* A line that is not syntactically correct for a header also marks
2025 the end of the headers. In this case, we leave next containing the
2026 first data line. This might actually be several lines because of the
2027 continuation logic applied above, but that doesn't matter.
2029 It turns out that smail, and presumably sendmail, accept leading lines
2032 From ph10 Fri Jan 5 12:35 GMT 1996
2034 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2035 find any documentation of this, but for compatibility it had better be
2036 accepted. Exim restricts it to the case of non-smtp messages, and
2037 treats it as an alternative to the -f command line option. Thus it is
2038 ignored except for trusted users or filter testing. Otherwise it is taken
2039 as the sender address, unless -f was used (sendmail compatibility).
2041 It further turns out that some UUCPs generate the From_line in a different
2044 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2046 The regex for matching these things is now capable of recognizing both
2047 formats (including 2- and 4-digit years in the latter). In fact, the regex
2048 is now configurable, as is the expansion string to fish out the sender.
2050 Even further on it has been discovered that some broken clients send
2051 these lines in SMTP messages. There is now an option to ignore them from
2052 specified hosts or networks. Sigh. */
2054 if (header_last == header_list &&
2057 (sender_host_address != NULL &&
2058 verify_check_host(&ignore_fromline_hosts) == OK)
2060 (sender_host_address == NULL && ignore_fromline_local)
2062 regex_match_and_setup(regex_From, next->text, 0, -1))
2064 if (!sender_address_forced)
2066 uschar *uucp_sender = expand_string(uucp_from_sender);
2067 if (uucp_sender == NULL)
2069 log_write(0, LOG_MAIN|LOG_PANIC,
2070 "expansion of \"%s\" failed after matching "
2071 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2075 int start, end, domain;
2077 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2078 &start, &end, &domain, TRUE);
2079 if (newsender != NULL)
2081 if (domain == 0 && newsender[0] != 0)
2082 newsender = rewrite_address_qualify(newsender, FALSE);
2084 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2086 sender_address = newsender;
2088 if (trusted_caller || filter_test != FTEST_NONE)
2090 authenticated_sender = NULL;
2091 originator_name = US"";
2092 sender_local = FALSE;
2095 if (filter_test != FTEST_NONE)
2096 printf("Sender taken from \"From \" line\n");
2103 /* Not a leading "From " line. Check to see if it is a valid header line.
2104 Header names may contain any non-control characters except space and colon,
2109 uschar *p = next->text;
2111 /* If not a valid header line, break from the header reading loop, leaving
2112 next != NULL, indicating that it holds the first line of the body. */
2114 if (isspace(*p)) break;
2115 while (mac_isgraph(*p) && *p != ':') p++;
2116 while (isspace(*p)) p++;
2119 body_zerocount = had_zero;
2123 /* We have a valid header line. If there were any binary zeroes in
2124 the line, stomp on them here. */
2127 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2129 /* It is perfectly legal to have an empty continuation line
2130 at the end of a header, but it is confusing to humans
2131 looking at such messages, since it looks like a blank line.
2132 Reduce confusion by removing redundant white space at the
2133 end. We know that there is at least one printing character
2134 (the ':' tested for above) so there is no danger of running
2137 p = next->text + ptr - 2;
2140 while (*p == ' ' || *p == '\t') p--;
2141 if (*p != '\n') break;
2142 ptr = (p--) - next->text + 1;
2143 message_size -= next->slen - ptr;
2144 next->text[ptr] = 0;
2148 /* Add the header to the chain */
2150 next->type = htype_other;
2152 header_last->next = next;
2155 /* Check the limit for individual line lengths. This comes after adding to
2156 the chain so that the failing line is reflected if a bounce is generated
2157 (for a local message). */
2159 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2161 log_write(0, LOG_MAIN, "overlong message header line received from "
2162 "%s (more than %d characters): message abandoned",
2163 sender_host_unknown? sender_ident : sender_fullhost,
2164 header_line_maxsize);
2168 smtp_reply = US"552 A message header line is too long";
2169 receive_swallow_smtp();
2170 goto TIDYUP; /* Skip to end of function */
2175 give_local_error(ERRMESS_VLONGHDRLINE,
2176 string_sprintf("message header line longer than %d characters "
2177 "received: message not accepted", header_line_maxsize), US"",
2178 error_rc, stdin, header_list->next);
2179 /* Does not return */
2183 /* Note if any resent- fields exist. */
2185 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2187 resents_exist = TRUE;
2188 resent_prefix = US"Resent-";
2192 /* Reject CHUNKING messages that do not CRLF their first header line */
2194 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2196 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2197 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2199 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2200 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2201 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2204 goto TIDYUP; /* Skip to end of function */
2207 /* The line has been handled. If we have hit EOF, break out of the loop,
2208 indicating no pending data line. */
2210 if (ch == EOF) { next = NULL; break; }
2212 /* Set up for the next header */
2215 next = store_get(sizeof(header_line));
2216 next->text = store_get(header_size);
2219 prevlines_length = 0;
2220 } /* Continue, starting to read the next header */
2222 /* At this point, we have read all the headers into a data structure in main
2223 store. The first header is still the dummy placeholder for the Received: header
2224 we are going to generate a bit later on. If next != NULL, it contains the first
2225 data line - which terminated the headers before reaching a blank line (not the
2230 debug_printf(">>Headers received:\n");
2231 for (h = header_list->next; h; h = h->next)
2232 debug_printf("%s", h->text);
2236 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2237 is dropped immediately after valid headers, the next thing we will see is EOF.
2238 We must test for this specially, as further down the reading of the data is
2239 skipped if already at EOF. */
2241 if (smtp_input && (receive_feof)())
2243 smtp_reply = handle_lost_connection(US" (after header)");
2245 goto TIDYUP; /* Skip to end of function */
2248 /* If this is a filter test run and no headers were read, output a warning
2249 in case there is a mistake in the test message. */
2251 if (filter_test != FTEST_NONE && header_list->next == NULL)
2252 printf("Warning: no message headers read\n");
2255 /* Scan the headers to identify them. Some are merely marked for later
2256 processing; some are dealt with here. */
2258 for (h = header_list->next; h; h = h->next)
2260 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2261 if (is_resent) contains_resent_headers = TRUE;
2263 switch (header_checkname(h, is_resent))
2266 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2270 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2273 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2276 if (!resents_exist || is_resent) date_header_exists = TRUE;
2279 /* Same comments as about Return-Path: below. */
2281 case htype_delivery_date:
2282 if (delivery_date_remove) h->type = htype_old;
2285 /* Same comments as about Return-Path: below. */
2287 case htype_envelope_to:
2288 if (envelope_to_remove) h->type = htype_old;
2291 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2292 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2293 header consists of just the login id of the user who called Exim, rewrite
2294 it with the gecos field first. Apply this rule to Resent-From: if there
2295 are resent- fields. */
2298 h->type = htype_from;
2299 if (!resents_exist || is_resent)
2305 uschar *s = Ustrchr(h->text, ':') + 1;
2306 while (isspace(*s)) s++;
2307 len = h->slen - (s - h->text) - 1;
2308 if (Ustrlen(originator_login) == len &&
2309 strncmpic(s, originator_login, len) == 0)
2311 uschar *name = is_resent? US"Resent-From" : US"From";
2312 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2313 originator_login, qualify_domain_sender);
2314 from_header = header_last;
2315 h->type = htype_old;
2316 DEBUG(D_receive|D_rewrite)
2317 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2323 /* Identify the Message-id: header for generating "in-reply-to" in the
2324 autoreply transport. For incoming logging, save any resent- value. In both
2325 cases, take just the first of any multiples. */
2328 if (msgid_header == NULL && (!resents_exist || is_resent))
2335 /* Flag all Received: headers */
2337 case htype_received:
2338 h->type = htype_received;
2342 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2344 case htype_reply_to:
2345 h->type = htype_reply_to;
2348 /* The Return-path: header is supposed to be added to messages when
2349 they leave the SMTP system. We shouldn't receive messages that already
2350 contain Return-path. However, since Exim generates Return-path: on
2351 local delivery, resent messages may well contain it. We therefore
2352 provide an option (which defaults on) to remove any Return-path: headers
2353 on input. Removal actually means flagging as "old", which prevents the
2354 header being transmitted with the message. */
2356 case htype_return_path:
2357 if (return_path_remove) h->type = htype_old;
2359 /* If we are testing a mail filter file, use the value of the
2360 Return-Path: header to set up the return_path variable, which is not
2361 otherwise set. However, remove any <> that surround the address
2362 because the variable doesn't have these. */
2364 if (filter_test != FTEST_NONE)
2366 uschar *start = h->text + 12;
2367 uschar *end = start + Ustrlen(start);
2368 while (isspace(*start)) start++;
2369 while (end > start && isspace(end[-1])) end--;
2370 if (*start == '<' && end[-1] == '>')
2375 return_path = string_copyn(start, end - start);
2376 printf("Return-path taken from \"Return-path:\" header line\n");
2380 /* If there is a "Sender:" header and the message is locally originated,
2381 and from an untrusted caller and suppress_local_fixups is not set, or if we
2382 are in submission mode for a remote message, mark it "old" so that it will
2383 not be transmitted with the message, unless active_local_sender_retain is
2384 set. (This can only be true if active_local_from_check is false.) If there
2385 are any resent- headers in the message, apply this rule to Resent-Sender:
2386 instead of Sender:. Messages with multiple resent- header sets cannot be
2387 tidily handled. (For this reason, at least one MUA - Pine - turns old
2388 resent- headers into X-resent- headers when resending, leaving just one
2392 h->type = ((!active_local_sender_retain &&
2394 (sender_local && !trusted_caller && !suppress_local_fixups)
2398 (!resents_exist||is_resent))?
2399 htype_old : htype_sender;
2402 /* Remember the Subject: header for logging. There is no Resent-Subject */
2408 /* "To:" gets flagged, and the existence of a recipient header is noted,
2409 whether it's resent- or not. */
2414 to_or_cc_header_exists = TRUE;
2420 /* Extract recipients from the headers if that is required (the -t option).
2421 Note that this is documented as being done *before* any address rewriting takes
2422 place. There are two possibilities:
2424 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2425 recipients already listed are to be REMOVED from the message. Smail 3 works
2426 like this. We need to build a non-recipients tree for that list, because in
2427 subsequent processing this data is held in a tree and that's what the
2428 spool_write_header() function expects. Make sure that non-recipient addresses
2429 are fully qualified and rewritten if necessary.
2431 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2432 those in the command line arguments (and it is rumoured some other MTAs do
2433 this). Therefore, there is an option to make Exim behave this way.
2435 *** Notes on "Resent-" header lines ***
2437 The presence of resent-headers in the message makes -t horribly ambiguous.
2438 Experiments with sendmail showed that it uses recipients for all resent-
2439 headers, totally ignoring the concept of "sets of resent- headers" as described
2440 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2441 with all the addresses in one instance of each header.
2443 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2444 error for -t if there were resent- headers in the message. However, after a
2445 discussion on the mailing list, I've learned that there are MUAs that use
2446 resent- headers with -t, and also that the stuff about sets of resent- headers
2447 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2448 message with -t and resent- header lines makes sure that only *its* resent-
2449 headers are present; previous ones are often renamed as X-resent- for example.
2451 Consequently, Exim has been changed so that, if any resent- header lines are
2452 present, the recipients are taken from all of the appropriate resent- lines,
2453 and not from the ordinary To:, Cc:, etc. */
2458 error_block **bnext = &bad_addresses;
2460 if (extract_addresses_remove_arguments)
2462 while (recipients_count-- > 0)
2464 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2465 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2466 tree_add_nonrecipient(s);
2468 recipients_list = NULL;
2469 recipients_count = recipients_list_max = 0;
2472 /* Now scan the headers */
2474 for (h = header_list->next; h; h = h->next)
2476 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2477 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2479 uschar *s = Ustrchr(h->text, ':') + 1;
2480 while (isspace(*s)) s++;
2482 parse_allow_group = TRUE; /* Allow address group syntax */
2486 uschar *ss = parse_find_address_end(s, FALSE);
2487 uschar *recipient, *errmess, *p, *pp;
2488 int start, end, domain;
2490 /* Check on maximum */
2492 if (recipients_max > 0 && ++rcount > recipients_max)
2494 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2495 US"message rejected: ", error_rc, stdin, NULL);
2496 /* Does not return */
2499 /* Make a copy of the address, and remove any internal newlines. These
2500 may be present as a result of continuations of the header line. The
2501 white space that follows the newline must not be removed - it is part
2504 pp = recipient = store_get(ss - s + 1);
2505 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2510 BOOL b = allow_utf8_domains;
2511 allow_utf8_domains = TRUE;
2513 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2517 if (string_is_utf8(recipient))
2518 message_smtputf8 = TRUE;
2520 allow_utf8_domains = b;
2524 /* Keep a list of all the bad addresses so we can send a single
2525 error message at the end. However, an empty address is not an error;
2526 just ignore it. This can come from an empty group list like
2528 To: Recipients of list:;
2530 If there are no recipients at all, an error will occur later. */
2532 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2534 int len = Ustrlen(s);
2535 error_block *b = store_get(sizeof(error_block));
2536 while (len > 0 && isspace(s[len-1])) len--;
2538 b->text1 = string_printing(string_copyn(s, len));
2544 /* If the recipient is already in the nonrecipients tree, it must
2545 have appeared on the command line with the option extract_addresses_
2546 remove_arguments set. Do not add it to the recipients, and keep a note
2547 that this has happened, in order to give a better error if there are
2548 no recipients left. */
2550 else if (recipient != NULL)
2552 if (tree_search(tree_nonrecipients, recipient) == NULL)
2553 receive_add_recipient(recipient, -1);
2555 extracted_ignored = TRUE;
2558 /* Move on past this address */
2560 s = ss + (*ss? 1:0);
2561 while (isspace(*s)) s++;
2562 } /* Next address */
2564 parse_allow_group = FALSE; /* Reset group syntax flags */
2565 parse_found_group = FALSE;
2567 /* If this was the bcc: header, mark it "old", which means it
2568 will be kept on the spool, but not transmitted as part of the
2571 if (h->type == htype_bcc) h->type = htype_old;
2572 } /* For appropriate header line */
2573 } /* For each header line */
2577 /* Now build the unique message id. This has changed several times over the
2578 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2579 Retaining all the history in the comment has become too unwieldy - read
2580 previous release sources if you want it.
2582 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2583 The first part is the current time, in seconds. The second part is the current
2584 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2585 can hold a number in the range 0-3843. It used to be a computed sequence
2586 number, but is now the fractional component of the current time in units of
2587 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2588 received, Exim ensures that the timer has ticked at the appropriate level
2589 before proceeding, to avoid duplication if the pid happened to be re-used
2590 within the same time period. It seems likely that most messages will take at
2591 least half a millisecond to be received, so no delay will normally be
2592 necessary. At least for some time...
2594 There is a modification when localhost_number is set. Formerly this was allowed
2595 to be as large as 255. Now it is restricted to the range 0-16, and the final
2596 component of the message id becomes (localhost_number * 200) + fractional time
2597 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2599 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2600 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2601 still allows the tttttt field to hold a large enough number to last for some
2602 more decades, and the final two-digit field can hold numbers up to 1295, which
2603 is enough for milliseconds (instead of 1/2000 of a second).
2605 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2606 pid, so it is probably safe because pids have to be positive. The
2607 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2608 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2610 Note that string_base62() returns its data in a static storage block, so it
2611 must be copied before calling string_base62() again. It always returns exactly
2614 There doesn't seem to be anything in the RFC which requires a message id to
2615 start with a letter, but Smail was changed to ensure this. The external form of
2616 the message id (as supplied by string expansion) therefore starts with an
2617 additional leading 'E'. The spool file names do not include this leading
2618 letter and it is not used internally.
2620 NOTE: If ever the format of message ids is changed, the regular expression for
2621 checking that a string is in this format must be updated in a corresponding
2622 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2623 must also be changed to reflect the correct string length. Then, of course,
2624 other programs that rely on the message id format will need updating too. */
2626 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2627 message_id[6] = '-';
2628 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2630 /* Deal with the case where the host number is set. The value of the number was
2631 checked when it was read, to ensure it isn't too big. The timing granularity is
2632 left in id_resolution so that an appropriate wait can be done after receiving
2633 the message, if necessary (we hope it won't be). */
2635 if (host_number_string != NULL)
2637 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2638 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2639 string_base62((long int)(
2640 host_number * (1000000/id_resolution) +
2641 message_id_tv.tv_usec/id_resolution)) + 4);
2644 /* Host number not set: final field is just the fractional time at an
2645 appropriate resolution. */
2649 id_resolution = (BASE_62 == 62)? 500 : 1000;
2650 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2651 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2654 /* Add the current message id onto the current process info string if
2657 (void)string_format(process_info + process_info_len,
2658 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2660 /* If we are using multiple input directories, set up the one for this message
2661 to be the least significant base-62 digit of the time of arrival. Otherwise
2662 ensure that it is an empty string. */
2664 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2666 /* Now that we have the message-id, if there is no message-id: header, generate
2667 one, but only for local (without suppress_local_fixups) or submission mode
2668 messages. This can be user-configured if required, but we had better flatten
2669 any illegal characters therein. */
2671 if (msgid_header == NULL &&
2672 ((sender_host_address == NULL && !suppress_local_fixups)
2673 || submission_mode))
2676 uschar *id_text = US"";
2677 uschar *id_domain = primary_hostname;
2679 /* Permit only letters, digits, dots, and hyphens in the domain */
2681 if (message_id_domain != NULL)
2683 uschar *new_id_domain = expand_string(message_id_domain);
2684 if (new_id_domain == NULL)
2686 if (!expand_string_forcedfail)
2687 log_write(0, LOG_MAIN|LOG_PANIC,
2688 "expansion of \"%s\" (message_id_header_domain) "
2689 "failed: %s", message_id_domain, expand_string_message);
2691 else if (*new_id_domain != 0)
2693 id_domain = new_id_domain;
2694 for (p = id_domain; *p != 0; p++)
2695 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2699 /* Permit all characters except controls and RFC 2822 specials in the
2700 additional text part. */
2702 if (message_id_text != NULL)
2704 uschar *new_id_text = expand_string(message_id_text);
2705 if (new_id_text == NULL)
2707 if (!expand_string_forcedfail)
2708 log_write(0, LOG_MAIN|LOG_PANIC,
2709 "expansion of \"%s\" (message_id_header_text) "
2710 "failed: %s", message_id_text, expand_string_message);
2712 else if (*new_id_text != 0)
2714 id_text = new_id_text;
2715 for (p = id_text; *p != 0; p++)
2716 if (mac_iscntrl_or_special(*p)) *p = '-';
2720 /* Add the header line
2721 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2722 * appended, to preserve classical expectations of header ordering. */
2724 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2725 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2726 (*id_text == 0)? "" : ".", id_text, id_domain);
2729 /* If we are to log recipients, keep a copy of the raw ones before any possible
2730 rewriting. Must copy the count, because later ACLs and the local_scan()
2731 function may mess with the real recipients. */
2733 if (LOGGING(received_recipients))
2735 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2736 for (i = 0; i < recipients_count; i++)
2737 raw_recipients[i] = string_copy(recipients_list[i].address);
2738 raw_recipients_count = recipients_count;
2741 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2742 recipients will get here only if the conditions were right (allow_unqualified_
2743 recipient is TRUE). */
2745 for (i = 0; i < recipients_count; i++)
2746 recipients_list[i].address =
2747 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2748 global_rewrite_rules, rewrite_existflags);
2750 /* If there is no From: header, generate one for local (without
2751 suppress_local_fixups) or submission_mode messages. If there is no sender
2752 address, but the sender is local or this is a local delivery error, use the
2753 originator login. This shouldn't happen for genuine bounces, but might happen
2754 for autoreplies. The addition of From: must be done *before* checking for the
2755 possible addition of a Sender: header, because untrusted_set_sender allows an
2756 untrusted user to set anything in the envelope (which might then get info
2757 From:) but we still want to ensure a valid Sender: if it is required. */
2759 if (from_header == NULL &&
2760 ((sender_host_address == NULL && !suppress_local_fixups)
2761 || submission_mode))
2763 uschar *oname = US"";
2765 /* Use the originator_name if this is a locally submitted message and the
2766 caller is not trusted. For trusted callers, use it only if -F was used to
2767 force its value or if we have a non-SMTP message for which -f was not used
2768 to set the sender. */
2770 if (sender_host_address == NULL)
2772 if (!trusted_caller || sender_name_forced ||
2773 (!smtp_input && !sender_address_forced))
2774 oname = originator_name;
2777 /* For non-locally submitted messages, the only time we use the originator
2778 name is when it was forced by the /name= option on control=submission. */
2782 if (submission_name != NULL) oname = submission_name;
2785 /* Envelope sender is empty */
2787 if (sender_address[0] == 0)
2789 uschar *fromstart, *fromend;
2791 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2792 oname, (oname[0] == 0)? "" : " <");
2793 fromend = (oname[0] == 0)? US"" : US">";
2795 if (sender_local || local_error_message)
2797 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2798 local_part_quote(originator_login), qualify_domain_sender,
2801 else if (submission_mode && authenticated_id != NULL)
2803 if (submission_domain == NULL)
2805 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2806 local_part_quote(authenticated_id), qualify_domain_sender,
2809 else if (submission_domain[0] == 0) /* empty => whole address set */
2811 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2816 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2817 local_part_quote(authenticated_id), submission_domain,
2820 from_header = header_last; /* To get it checked for Sender: */
2824 /* There is a non-null envelope sender. Build the header using the original
2825 sender address, before any rewriting that might have been done while
2830 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2832 (oname[0] == 0)? "" : " <",
2833 (sender_address_unrewritten == NULL)?
2834 sender_address : sender_address_unrewritten,
2835 (oname[0] == 0)? "" : ">");
2837 from_header = header_last; /* To get it checked for Sender: */
2842 /* If the sender is local (without suppress_local_fixups), or if we are in
2843 submission mode and there is an authenticated_id, check that an existing From:
2844 is correct, and if not, generate a Sender: header, unless disabled. Any
2845 previously-existing Sender: header was removed above. Note that sender_local,
2846 as well as being TRUE if the caller of exim is not trusted, is also true if a
2847 trusted caller did not supply a -f argument for non-smtp input. To allow
2848 trusted callers to forge From: without supplying -f, we have to test explicitly
2849 here. If the From: header contains more than one address, then the call to
2850 parse_extract_address fails, and a Sender: header is inserted, as required. */
2852 if (from_header != NULL &&
2853 (active_local_from_check &&
2854 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2855 (submission_mode && authenticated_id != NULL))
2858 BOOL make_sender = TRUE;
2859 int start, end, domain;
2861 uschar *from_address =
2862 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2863 &start, &end, &domain, FALSE);
2864 uschar *generated_sender_address;
2866 if (submission_mode)
2868 if (submission_domain == NULL)
2870 generated_sender_address = string_sprintf("%s@%s",
2871 local_part_quote(authenticated_id), qualify_domain_sender);
2873 else if (submission_domain[0] == 0) /* empty => full address */
2875 generated_sender_address = string_sprintf("%s",
2880 generated_sender_address = string_sprintf("%s@%s",
2881 local_part_quote(authenticated_id), submission_domain);
2885 generated_sender_address = string_sprintf("%s@%s",
2886 local_part_quote(originator_login), qualify_domain_sender);
2888 /* Remove permitted prefixes and suffixes from the local part of the From:
2889 address before doing the comparison with the generated sender. */
2891 if (from_address != NULL)
2894 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2896 if (at != NULL) *at = 0;
2897 from_address += route_check_prefix(from_address, local_from_prefix);
2898 slen = route_check_suffix(from_address, local_from_suffix);
2901 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2902 from_address += slen;
2904 if (at != NULL) *at = '@';
2906 if (strcmpic(generated_sender_address, from_address) == 0 ||
2907 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2908 make_sender = FALSE;
2911 /* We have to cause the Sender header to be rewritten if there are
2912 appropriate rewriting rules. */
2916 if (submission_mode && submission_name == NULL)
2917 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2918 generated_sender_address);
2920 header_add(htype_sender, "%sSender: %s <%s>\n",
2922 submission_mode? submission_name : originator_name,
2923 generated_sender_address);
2926 /* Ensure that a non-null envelope sender address corresponds to the
2927 submission mode sender address. */
2929 if (submission_mode && sender_address[0] != 0)
2931 if (sender_address_unrewritten == NULL)
2932 sender_address_unrewritten = sender_address;
2933 sender_address = generated_sender_address;
2934 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2935 log_write(L_address_rewrite, LOG_MAIN,
2936 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2937 sender_address_unrewritten, generated_sender_address);
2941 /* If there are any rewriting rules, apply them to the sender address, unless
2942 it has already been rewritten as part of verification for SMTP input. */
2944 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2945 sender_address[0] != 0)
2947 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2948 global_rewrite_rules, rewrite_existflags);
2949 DEBUG(D_receive|D_rewrite)
2950 debug_printf("rewritten sender = %s\n", sender_address);
2954 /* The headers must be run through rewrite_header(), because it ensures that
2955 addresses are fully qualified, as well as applying any rewriting rules that may
2958 Qualification of header addresses in a message from a remote host happens only
2959 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2960 appropriate. For local messages, qualification always happens, unless -bnq is
2961 used to explicitly suppress it. No rewriting is done for an unqualified address
2962 that is left untouched.
2964 We start at the second header, skipping our own Received:. This rewriting is
2965 documented as happening *after* recipient addresses are taken from the headers
2966 by the -t command line option. An added Sender: gets rewritten here. */
2968 for (h = header_list->next; h; h = h->next)
2970 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2971 rewrite_existflags, TRUE);
2976 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2977 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2978 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2979 exists, this applies to the set of resent- headers rather than the normal set.
2981 The requirement for a recipient header has been removed in RFC 2822. At this
2982 point in the code, earlier versions of Exim added a To: header for locally
2983 submitted messages, and an empty Bcc: header for others. In the light of the
2984 changes in RFC 2822, this was dropped in November 2003. */
2987 /* If there is no date header, generate one if the message originates locally
2988 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2989 submission mode flag is set. Messages without Date: are not valid, but it seems
2990 to be more confusing if Exim adds one to all remotely-originated messages.
2991 As per Message-Id, we prepend if resending, else append.
2994 if (!date_header_exists &&
2995 ((sender_host_address == NULL && !suppress_local_fixups)
2996 || submission_mode))
2997 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2998 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3000 search_tidyup(); /* Free any cached resources */
3002 /* Show the complete set of headers if debugging. Note that the first one (the
3003 new Received:) has not yet been set. */
3007 debug_printf(">>Headers after rewriting and local additions:\n");
3008 for (h = header_list->next; h != NULL; h = h->next)
3009 debug_printf("%c %s", h->type, h->text);
3013 /* The headers are now complete in store. If we are running in filter
3014 testing mode, that is all this function does. Return TRUE if the message
3015 ended with a dot. */
3017 if (filter_test != FTEST_NONE)
3019 process_info[process_info_len] = 0;
3020 return message_ended == END_DOT;
3023 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3024 think more if it could be handled. Cannot do onward CHUNKING unless
3025 inbound is, but inbound chunking ought to be ok with outbound plain.
3026 Could we do onward CHUNKING given inbound CHUNKING?
3028 if (chunking_state > CHUNKING_OFFERED)
3029 cancel_cutthrough_connection(FALSE, US"chunking active");
3031 /* Cutthrough delivery:
3032 We have to create the Received header now rather than at the end of reception,
3033 so the timestamp behaviour is a change to the normal case.
3034 Having created it, send the headers to the destination. */
3036 if (cutthrough.fd >= 0 && cutthrough.delivery)
3038 if (received_count > received_headers_max)
3040 cancel_cutthrough_connection(TRUE, US"too many headers");
3041 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3042 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3043 "Too many \"Received\" headers",
3045 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3046 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3047 message_id[0] = 0; /* Indicate no message accepted */
3048 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3049 goto TIDYUP; /* Skip to end of function */
3051 received_header_gen();
3052 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3053 (void) cutthrough_headers_send();
3057 /* Open a new spool file for the data portion of the message. We need
3058 to access it both via a file descriptor and a stream. Try to make the
3059 directory if it isn't there. */
3061 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3062 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3064 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3066 if (errno == ENOENT)
3068 (void) directory_make(spool_directory,
3069 spool_sname(US"input", message_subdir),
3070 INPUT_DIRECTORY_MODE, TRUE);
3071 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3074 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3075 spool_name, strerror(errno));
3078 /* Make sure the file's group is the Exim gid, and double-check the mode
3079 because the group setting doesn't always get set automatically. */
3081 if (fchown(data_fd, exim_uid, exim_gid))
3082 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3083 "Failed setting ownership on spool file %s: %s",
3084 spool_name, strerror(errno));
3085 (void)fchmod(data_fd, SPOOL_MODE);
3087 /* We now have data file open. Build a stream for it and lock it. We lock only
3088 the first line of the file (containing the message ID) because otherwise there
3089 are problems when Exim is run under Cygwin (I'm told). See comments in
3090 spool_in.c, where the same locking is done. */
3092 data_file = fdopen(data_fd, "w+");
3093 lock_data.l_type = F_WRLCK;
3094 lock_data.l_whence = SEEK_SET;
3095 lock_data.l_start = 0;
3096 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3098 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3099 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3100 errno, strerror(errno));
3102 /* We have an open, locked data file. Write the message id to it to make it
3103 self-identifying. Then read the remainder of the input of this message and
3104 write it to the data file. If the variable next != NULL, it contains the first
3105 data line (which was read as a header but then turned out not to have the right
3106 format); write it (remembering that it might contain binary zeros). The result
3107 of fwrite() isn't inspected; instead we call ferror() below. */
3109 fprintf(data_file, "%s-D\n", message_id);
3112 uschar *s = next->text;
3113 int len = next->slen;
3114 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3115 body_linecount++; /* Assumes only 1 line */
3118 /* Note that we might already be at end of file, or the logical end of file
3119 (indicated by '.'), or might have encountered an error while writing the
3120 message id or "next" line. */
3122 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3126 message_ended = chunking_state <= CHUNKING_OFFERED
3127 ? read_message_data_smtp(data_file)
3129 ? read_message_bdat_smtp_wire(data_file)
3130 : read_message_bdat_smtp(data_file);
3131 receive_linecount++; /* The terminating "." line */
3133 else message_ended = read_message_data(data_file);
3135 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3136 message_linecount += body_linecount;
3138 switch (message_ended)
3140 /* Handle premature termination of SMTP */
3145 Uunlink(spool_name); /* Lose data file when closed */
3146 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3147 message_id[0] = 0; /* Indicate no message accepted */
3148 smtp_reply = handle_lost_connection(US"");
3150 goto TIDYUP; /* Skip to end of function */
3154 /* Handle message that is too big. Don't use host_or_ident() in the log
3155 message; we want to see the ident value even for non-remote messages. */
3158 Uunlink(spool_name); /* Lose the data file when closed */
3159 cancel_cutthrough_connection(TRUE, US"mail too big");
3160 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3162 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3163 "message too big: read=%d max=%d",
3165 (sender_fullhost == NULL)? "" : " H=",
3166 (sender_fullhost == NULL)? US"" : sender_fullhost,
3167 (sender_ident == NULL)? "" : " U=",
3168 (sender_ident == NULL)? US"" : sender_ident,
3170 thismessage_size_limit);
3174 smtp_reply = US"552 Message size exceeds maximum permitted";
3175 message_id[0] = 0; /* Indicate no message accepted */
3176 goto TIDYUP; /* Skip to end of function */
3180 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3181 give_local_error(ERRMESS_TOOBIG,
3182 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3183 US"message rejected: ", error_rc, data_file, header_list);
3184 /* Does not return */
3188 /* Handle bad BDAT protocol sequence */
3191 Uunlink(spool_name); /* Lose the data file when closed */
3192 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3193 smtp_reply = US""; /* Response already sent */
3194 message_id[0] = 0; /* Indicate no message accepted */
3195 goto TIDYUP; /* Skip to end of function */
3199 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3200 example, there may be some expansion in an ACL that uses a timer.) */
3202 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3204 /* The message body has now been read into the data file. Call fflush() to
3205 empty the buffers in C, and then call fsync() to get the data written out onto
3206 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3207 having to do this). If there was an I/O error on either input or output,
3208 attempt to send an error message, and unlink the spool file. For non-SMTP input
3209 we can then give up. Note that for SMTP input we must swallow the remainder of
3210 the input in cases of output errors, since the far end doesn't expect to see
3211 anything until the terminating dot line is sent. */
3213 if (fflush(data_file) == EOF || ferror(data_file) ||
3214 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3216 uschar *msg_errno = US strerror(errno);
3217 BOOL input_error = (receive_ferror)() != 0;
3218 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3219 input_error? "Input read" : "Spool write",
3221 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3223 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3224 Uunlink(spool_name); /* Lose the data file */
3225 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3230 smtp_reply = US"451 Error while reading input data";
3233 smtp_reply = US"451 Error while writing spool file";
3234 receive_swallow_smtp();
3236 message_id[0] = 0; /* Indicate no message accepted */
3237 goto TIDYUP; /* Skip to end of function */
3242 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3243 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3245 /* Does not return */
3250 /* No I/O errors were encountered while writing the data file. */
3252 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3255 /* If there were any bad addresses extracted by -t, or there were no recipients
3256 left after -t, send a message to the sender of this message, or write it to
3257 stderr if the error handling option is set that way. Note that there may
3258 legitimately be no recipients for an SMTP message if they have all been removed
3261 We need to rewind the data file in order to read it. In the case of no
3262 recipients or stderr error writing, throw the data file away afterwards, and
3263 exit. (This can't be SMTP, which always ensures there's at least one
3264 syntactically good recipient address.) */
3266 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3270 if (recipients_count == 0) debug_printf("*** No recipients\n");
3271 if (bad_addresses != NULL)
3273 error_block *eblock = bad_addresses;
3274 debug_printf("*** Bad address(es)\n");
3275 while (eblock != NULL)
3277 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3278 eblock = eblock->next;
3283 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3285 /* If configured to send errors to the sender, but this fails, force
3286 a failure error code. We use a special one for no recipients so that it
3287 can be detected by the autoreply transport. Otherwise error_rc is set to
3288 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3289 it is EXIT_SUCCESS. */
3291 if (error_handling == ERRORS_SENDER)
3293 if (!moan_to_sender(
3294 (bad_addresses == NULL)?
3295 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3296 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3297 bad_addresses, header_list, data_file, FALSE))
3298 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3302 if (bad_addresses == NULL)
3304 if (extracted_ignored)
3305 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3307 fprintf(stderr, "exim: no recipients in message\n");
3311 fprintf(stderr, "exim: invalid address%s",
3312 (bad_addresses->next == NULL)? ":" : "es:\n");
3313 while (bad_addresses != NULL)
3315 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3316 bad_addresses->text2);
3317 bad_addresses = bad_addresses->next;
3322 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3324 Uunlink(spool_name);
3325 (void)fclose(data_file);
3326 exim_exit(error_rc);
3330 /* Data file successfully written. Generate text for the Received: header by
3331 expanding the configured string, and adding a timestamp. By leaving this
3332 operation till now, we ensure that the timestamp is the time that message
3333 reception was completed. However, this is deliberately done before calling the
3334 data ACL and local_scan().
3336 This Received: header may therefore be inspected by the data ACL and by code in
3337 the local_scan() function. When they have run, we update the timestamp to be
3338 the final time of reception.
3340 If there is just one recipient, set up its value in the $received_for variable
3341 for use when we generate the Received: header.
3343 Note: the checking for too many Received: headers is handled by the delivery
3345 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3347 if (received_header->text == NULL) /* Non-cutthrough case */
3349 received_header_gen();
3351 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3353 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3354 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3356 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3357 now, before running the DATA ACL. */
3359 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3362 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3363 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3365 /* If an ACL is specified for checking things at this stage of reception of a
3366 message, run it, unless all the recipients were removed by "discard" in earlier
3367 ACLs. That is the only case in which recipients_count can be zero at this
3368 stage. Set deliver_datafile to point to the data file so that $message_body and
3369 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3372 deliver_datafile = data_fd;
3375 enable_dollar_recipients = TRUE;
3377 if (recipients_count == 0)
3378 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3382 /* Handle interactive SMTP messages */
3384 if (smtp_input && !smtp_batched_input)
3387 #ifndef DISABLE_DKIM
3388 if (!dkim_disable_verify)
3390 /* Finish verification, this will log individual signature results to
3392 dkim_exim_verify_finish();
3394 /* Check if we must run the DKIM ACL */
3395 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3397 uschar *dkim_verify_signers_expanded =
3398 expand_string(dkim_verify_signers);
3399 if (!dkim_verify_signers_expanded)
3400 log_write(0, LOG_MAIN|LOG_PANIC,
3401 "expansion of dkim_verify_signers option failed: %s",
3402 expand_string_message);
3407 const uschar *ptr = dkim_verify_signers_expanded;
3408 uschar *item = NULL;
3409 gstring * seen_items = NULL;
3411 /* Default to OK when no items are present */
3413 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3415 /* Prevent running ACL for an empty item */
3416 if (!item || !*item) continue;
3418 /* Only run ACL once for each domain or identity,
3419 no matter how often it appears in the expanded list. */
3423 const uschar *seen_items_list = string_from_gstring(seen_items);
3424 BOOL seen_this_item = FALSE;
3426 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3428 if (Ustrcmp(seen_item,item) == 0)
3430 seen_this_item = TRUE;
3437 debug_printf("acl_smtp_dkim: skipping signer %s, "
3438 "already seen\n", item);
3442 seen_items = string_cat(seen_items, ":");
3445 seen_items = string_cat(seen_items, item);
3448 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3451 dkim_exim_acl_setup(item);
3452 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3453 &user_msg, &log_msg);
3458 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3459 "skipping remaining items\n", rc, item);
3460 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3464 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3467 recipients_count = 0;
3468 blackholed_by = US"DKIM ACL";
3469 if (log_msg != NULL)
3470 blackhole_log_msg = string_sprintf(": %s", log_msg);
3474 Uunlink(spool_name);
3475 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3476 smtp_yield = FALSE; /* No more messages after dropped connection */
3477 smtp_reply = US""; /* Indicate reply already sent */
3478 message_id[0] = 0; /* Indicate no message accepted */
3479 goto TIDYUP; /* Skip to end of function */
3484 #endif /* DISABLE_DKIM */
3486 #ifdef WITH_CONTENT_SCAN
3487 if (recipients_count > 0 &&
3488 acl_smtp_mime != NULL &&
3489 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3491 #endif /* WITH_CONTENT_SCAN */
3493 #ifdef EXPERIMENTAL_DMARC
3494 dmarc_up = dmarc_store_data(from_header);
3495 #endif /* EXPERIMENTAL_DMARC */
3497 #ifndef DISABLE_PRDR
3498 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3502 int all_fail = FAIL;
3504 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3505 /* Loop through recipients, responses must be in same order received */
3506 for (c = 0; recipients_count > c; c++)
3508 uschar * addr= recipients_list[c].address;
3509 uschar * msg= US"PRDR R=<%s> %s";
3512 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3513 addr, c+1, recipients_count);
3514 rc = acl_check(ACL_WHERE_PRDR, addr,
3515 acl_smtp_data_prdr, &user_msg, &log_msg);
3517 /* If any recipient rejected content, indicate it in final message */
3519 /* If all recipients rejected, indicate in final message */
3524 case OK: case DISCARD: code = US"250"; break;
3525 case DEFER: code = US"450"; break;
3526 default: code = US"550"; break;
3528 if (user_msg != NULL)
3529 smtp_user_msg(code, user_msg);
3534 case OK: case DISCARD:
3535 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3537 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3539 msg = string_sprintf(CS msg, addr, "refusal"); break;
3541 smtp_user_msg(code, msg);
3543 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3544 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3545 else log_write(0, LOG_MAIN, "%s", CS msg);
3547 if (rc != OK) { receive_remove_recipient(addr); c--; }
3549 /* Set up final message, used if data acl gives OK */
3550 smtp_reply = string_sprintf("%s id=%s message %s",
3551 all_fail == FAIL ? US"550" : US"250",
3554 ? US"rejected for all recipients"
3557 : US"accepted for some recipients");
3558 if (recipients_count == 0)
3560 message_id[0] = 0; /* Indicate no message accepted */
3565 prdr_requested = FALSE;
3566 #endif /* !DISABLE_PRDR */
3568 /* Check the recipients count again, as the MIME ACL might have changed
3571 if (acl_smtp_data != NULL && recipients_count > 0)
3573 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3574 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3577 recipients_count = 0;
3578 blackholed_by = US"DATA ACL";
3580 blackhole_log_msg = string_sprintf(": %s", log_msg);
3581 cancel_cutthrough_connection(TRUE, US"data acl discard");
3585 Uunlink(spool_name);
3586 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3587 #ifdef WITH_CONTENT_SCAN
3590 #ifdef EXPERIMENTAL_DCC
3593 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3594 smtp_yield = FALSE; /* No more messages after dropped connection */
3595 smtp_reply = US""; /* Indicate reply already sent */
3596 message_id[0] = 0; /* Indicate no message accepted */
3597 goto TIDYUP; /* Skip to end of function */
3602 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3603 we cannot take different actions for permanent and temporary rejections. */
3608 #ifdef WITH_CONTENT_SCAN
3609 if (acl_not_smtp_mime != NULL &&
3610 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3613 #endif /* WITH_CONTENT_SCAN */
3615 if (acl_not_smtp != NULL)
3617 uschar *user_msg, *log_msg;
3618 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3621 recipients_count = 0;
3622 blackholed_by = US"non-SMTP ACL";
3623 if (log_msg != NULL)
3624 blackhole_log_msg = string_sprintf(": %s", log_msg);
3628 Uunlink(spool_name);
3629 #ifdef WITH_CONTENT_SCAN
3632 #ifdef EXPERIMENTAL_DCC
3635 /* The ACL can specify where rejections are to be logged, possibly
3636 nowhere. The default is main and reject logs. */
3638 if (log_reject_target != 0)
3639 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3640 sender_address, log_msg);
3642 if (user_msg == NULL) user_msg = US"local configuration problem";
3643 if (smtp_batched_input)
3645 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3646 /* Does not return */
3650 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3651 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3652 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3654 /* Does not return */
3657 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3661 /* The applicable ACLs have been run */
3663 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3664 if (queue_only_policy) queued_by = US"ACL";
3667 #ifdef WITH_CONTENT_SCAN
3671 #ifdef EXPERIMENTAL_DCC
3676 /* The final check on the message is to run the scan_local() function. The
3677 version supplied with Exim always accepts, but this is a hook for sysadmins to
3678 supply their own checking code. The local_scan() function is run even when all
3679 the recipients have been discarded. */
3680 /*XXS could we avoid this for the standard case, given that few people will use it? */
3682 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3684 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3685 deleted, and the incident gets logged. */
3687 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3688 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3689 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3690 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3692 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3693 local_scan_timeout);
3694 local_scan_data = NULL;
3696 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3697 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3698 rc = local_scan(data_fd, &local_scan_data);
3700 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3702 enable_dollar_recipients = FALSE;
3704 store_pool = POOL_MAIN; /* In case changed */
3705 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3708 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3709 os_non_restarting_signal(SIGFPE, SIG_DFL);
3710 os_non_restarting_signal(SIGILL, SIG_DFL);
3711 os_non_restarting_signal(SIGBUS, SIG_DFL);
3713 /* The length check is paranoia against some runaway code, and also because
3714 (for a success return) lines in the spool file are read into big_buffer. */
3716 if (local_scan_data != NULL)
3718 int len = Ustrlen(local_scan_data);
3719 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3720 local_scan_data = string_copyn(local_scan_data, len);
3723 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3725 if (!deliver_freeze) /* ACL might have already frozen */
3727 deliver_freeze = TRUE;
3728 deliver_frozen_at = time(NULL);
3729 frozen_by = US"local_scan()";
3731 rc = LOCAL_SCAN_ACCEPT;
3733 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3735 if (!queue_only_policy) /* ACL might have already queued */
3737 queue_only_policy = TRUE;
3738 queued_by = US"local_scan()";
3740 rc = LOCAL_SCAN_ACCEPT;
3743 /* Message accepted: remove newlines in local_scan_data because otherwise
3744 the spool file gets corrupted. Ensure that all recipients are qualified. */
3746 if (rc == LOCAL_SCAN_ACCEPT)
3748 if (local_scan_data != NULL)
3751 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3753 for (i = 0; i < recipients_count; i++)
3755 recipient_item *r = recipients_list + i;
3756 r->address = rewrite_address_qualify(r->address, TRUE);
3757 if (r->errors_to != NULL)
3758 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3760 if (recipients_count == 0 && blackholed_by == NULL)
3761 blackholed_by = US"local_scan";
3764 /* Message rejected: newlines permitted in local_scan_data to generate
3765 multiline SMTP responses. */
3769 uschar *istemp = US"";
3773 errmsg = local_scan_data;
3775 Uunlink(spool_name); /* Cancel this message */
3779 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3780 "rejection given", rc);
3783 case LOCAL_SCAN_REJECT_NOLOGHDR:
3784 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3787 case LOCAL_SCAN_REJECT:
3788 smtp_code = US"550";
3789 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3792 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3793 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3796 case LOCAL_SCAN_TEMPREJECT:
3798 smtp_code = US"451";
3799 if (errmsg == NULL) errmsg = US"Temporary local problem";
3800 istemp = US"temporarily ";
3804 g = string_append(g, 2, US"F=",
3805 sender_address[0] == 0 ? US"<>" : sender_address);
3806 g = add_host_info_for_log(g);
3808 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3809 string_from_gstring(g), istemp, string_printing(errmsg));
3813 if (!smtp_batched_input)
3815 smtp_respond(smtp_code, 3, TRUE, errmsg);
3816 message_id[0] = 0; /* Indicate no message accepted */
3817 smtp_reply = US""; /* Indicate reply already sent */
3818 goto TIDYUP; /* Skip to end of function */
3822 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3823 /* Does not return */
3828 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3829 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3830 US"message rejected by local scan code: ", error_rc, data_file,
3832 /* Does not return */
3836 /* Reset signal handlers to ignore signals that previously would have caused
3837 the message to be abandoned. */
3839 signal(SIGTERM, SIG_IGN);
3840 signal(SIGINT, SIG_IGN);
3843 /* Ensure the first time flag is set in the newly-received message. */
3845 deliver_firsttime = TRUE;
3847 #ifdef EXPERIMENTAL_BRIGHTMAIL
3849 { /* rewind data file */
3850 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3851 bmi_verdicts = bmi_process_message(header_list, data_fd);
3855 /* Update the timestamp in our Received: header to account for any time taken by
3856 an ACL or by local_scan(). The new time is the time that all reception
3857 processing is complete. */
3859 timestamp = expand_string(US"${tod_full}");
3860 tslen = Ustrlen(timestamp);
3862 memcpy(received_header->text + received_header->slen - tslen - 1,
3865 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3869 deliver_freeze = FALSE;
3870 queue_only_policy = FALSE;
3873 /* Keep the data file open until we have written the header file, in order to
3874 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3875 don't write the header file, and we unlink the data file. If writing the header
3876 file fails, we have failed to accept this message. */
3878 if (host_checking || blackholed_by != NULL)
3881 Uunlink(spool_name);
3882 msg_size = 0; /* Compute size for log line */
3883 for (h = header_list; h != NULL; h = h->next)
3884 if (h->type != '*') msg_size += h->slen;
3887 /* Write the -H file */
3890 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3892 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3893 Uunlink(spool_name); /* Lose the data file */
3897 smtp_reply = US"451 Error in writing spool file";
3898 message_id[0] = 0; /* Indicate no message accepted */
3903 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3904 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3906 /* Does not return */
3911 /* The message has now been successfully received. */
3913 receive_messagecount++;
3915 /* In SMTP sessions we may receive several in one connection. After each one,
3916 we wait for the clock to tick at the level of message-id granularity. This is
3917 so that the combination of time+pid is unique, even on systems where the pid
3918 can be re-used within our time interval. We can't shorten the interval without
3919 re-designing the message-id. See comments above where the message id is
3920 created. This is Something For The Future. */
3922 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3923 exim_wait_tick(&message_id_tv, id_resolution);
3925 /* Add data size to written header size. We do not count the initial file name
3926 that is in the file, but we do add one extra for the notional blank line that
3927 precedes the data. This total differs from message_size in that it include the
3928 added Received: header and any other headers that got created locally. */
3931 fstat(data_fd, &statbuf);
3933 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3935 /* Generate a "message received" log entry. We do this by building up a dynamic
3936 string as required. Since we commonly want to add two items at a time, use a
3937 macro to simplify the coding. We log the arrival of a new message while the
3938 file is still locked, just in case the machine is *really* fast, and delivers
3939 it first! Include any message id that is in the message - since the syntax of a
3940 message id is actually an addr-spec, we can use the parse routine to canonicalize
3943 g = string_get(256);
3945 g = string_append(g, 2,
3946 fake_response == FAIL ? US"(= " : US"<= ",
3947 sender_address[0] == 0 ? US"<>" : sender_address);
3948 if (message_reference)
3949 g = string_append(g, 2, US" R=", message_reference);
3951 g = add_host_info_for_log(g);
3954 if (LOGGING(tls_cipher) && tls_in.cipher)
3955 g = string_append(g, 2, US" X=", tls_in.cipher);
3956 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3957 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3958 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3959 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3960 if (LOGGING(tls_sni) && tls_in.sni)
3961 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3964 if (sender_host_authenticated)
3966 g = string_append(g, 2, US" A=", sender_host_authenticated);
3967 if (authenticated_id)
3969 g = string_append(g, 2, US":", authenticated_id);
3970 if (LOGGING(smtp_mailauth) && authenticated_sender)
3971 g = string_append(g, 2, US":", authenticated_sender);
3975 #ifndef DISABLE_PRDR
3977 g = string_catn(g, US" PRDR", 5);
3980 #ifdef SUPPORT_PROXY
3981 if (proxy_session && LOGGING(proxy))
3982 g = string_append(g, 2, US" PRX=", proxy_local_address);
3985 if (chunking_state > CHUNKING_OFFERED)
3986 g = string_catn(g, US" K", 2);
3988 sprintf(CS big_buffer, "%d", msg_size);
3989 g = string_append(g, 2, US" S=", big_buffer);
3991 /* log 8BITMIME mode announced in MAIL_FROM
3995 if (LOGGING(8bitmime))
3997 sprintf(CS big_buffer, "%d", body_8bitmime);
3998 g = string_append(g, 2, US" M8S=", big_buffer);
4002 g = string_append(g, 2, US" Q=", queue_name);
4004 /* If an addr-spec in a message-id contains a quoted string, it can contain
4005 any characters except " \ and CR and so in particular it can contain NL!
4006 Therefore, make sure we use a printing-characters only version for the log.
4007 Also, allow for domain literals in the message id. */
4012 BOOL save_allow_domain_literals = allow_domain_literals;
4013 allow_domain_literals = TRUE;
4014 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4015 &errmsg, &start, &end, &domain, FALSE);
4016 allow_domain_literals = save_allow_domain_literals;
4018 g = string_append(g, 2, US" id=", string_printing(old_id));
4021 /* If subject logging is turned on, create suitable printing-character
4022 text. By expanding $h_subject: we make use of the MIME decoding. */
4024 if (LOGGING(subject) && subject_header != NULL)
4027 uschar *p = big_buffer;
4028 uschar *ss = expand_string(US"$h_subject:");
4030 /* Backslash-quote any double quotes or backslashes so as to make a
4031 a C-like string, and turn any non-printers into escape sequences. */
4034 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4036 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4041 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4044 /* Terminate the string: string_cat() and string_append() leave room, but do
4045 not put the zero in. */
4047 (void) string_from_gstring(g);
4049 /* Create a message log file if message logs are being used and this message is
4050 not blackholed. Write the reception stuff to it. We used to leave message log
4051 creation until the first delivery, but this has proved confusing for some
4054 if (message_logs && !blackholed_by)
4058 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4060 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4064 (void)directory_make(spool_directory,
4065 spool_sname(US"msglog", message_subdir),
4066 MSGLOG_DIRECTORY_MODE, TRUE);
4067 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4071 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4072 spool_name, strerror(errno));
4075 FILE *message_log = fdopen(fd, "a");
4076 if (message_log == NULL)
4078 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4079 spool_name, strerror(errno));
4084 uschar *now = tod_stamp(tod_log);
4085 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4086 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4088 if (queue_only_policy) fprintf(message_log,
4089 "%s no immediate delivery: queued%s%s by %s\n", now,
4090 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4092 (void)fclose(message_log);
4097 /* Everything has now been done for a successful message except logging its
4098 arrival, and outputting an SMTP response. While writing to the log, set a flag
4099 to cause a call to receive_bomb_out() if the log cannot be opened. */
4101 receive_call_bombout = TRUE;
4103 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4104 connection has gone away. This can only be done if there is no unconsumed input
4105 waiting in the local input buffer. We can test for this by calling
4106 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4107 input to be sent following the final dot, so the presence of following input is
4110 If the connection is still present, but there is no unread input for the
4111 socket, the result of a select() call will be zero. If, however, the connection
4112 has gone away, or if there is pending input, the result of select() will be
4113 non-zero. The two cases can be distinguished by trying to read the next input
4114 character. If we succeed, we can unread it so that it remains in the local
4115 buffer for handling later. If not, the connection has been lost.
4117 Of course, since TCP/IP is asynchronous, there is always a chance that the
4118 connection will vanish between the time of this test and the sending of the
4119 response, but the chance of this happening should be small. */
4121 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4122 !receive_smtp_buffered())
4125 fd_set select_check;
4126 FD_ZERO(&select_check);
4127 FD_SET(fileno(smtp_in), &select_check);
4131 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4133 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4134 if (c != EOF) (receive_ungetc)(c); else
4136 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4137 smtp_reply = US""; /* No attempt to send a response */
4138 smtp_yield = FALSE; /* Nothing more on this connection */
4140 /* Re-use the log line workspace */
4143 g = string_cat(g, US"SMTP connection lost after final dot");
4144 g = add_host_info_for_log(g);
4145 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4147 /* Delete the files for this aborted message. */
4149 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4150 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4151 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4158 /* The connection has not gone away; we really are going to take responsibility
4159 for this message. */
4161 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4164 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4165 the sender's dot (below).
4166 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4167 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4168 in which case pass temp-reject back to initiator and dump the files.
4170 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4172 XXX We do not handle queue-only, freezing, or blackholes.
4174 if(cutthrough.fd >= 0 && cutthrough.delivery)
4176 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4177 /* Logging was done in finaldot() */
4180 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4181 cutthrough_done = ACCEPTED;
4182 break; /* message_id needed for SMTP accept below */
4184 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4185 ... for which, pass back the exact error */
4186 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4189 default: /* Unknown response, or error. Treat as temp-reject. */
4190 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4191 break; /* message_id needed for SMTP accept below */
4193 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4194 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4195 cutthrough_done = PERM_REJ;
4200 #ifndef DISABLE_PRDR
4201 if(!smtp_reply || prdr_requested)
4206 log_write(0, LOG_MAIN |
4207 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4208 (LOGGING(received_sender)? LOG_SENDER : 0),
4211 /* Log any control actions taken by an ACL or local_scan(). */
4213 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4214 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4215 "no immediate delivery: queued%s%s by %s",
4216 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4219 receive_call_bombout = FALSE;
4221 store_reset(g); /* The store for the main log message can be reused */
4223 /* If the message is frozen, and freeze_tell is set, do the telling. */
4225 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4227 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4228 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4229 message_id, frozen_by, sender_address);
4233 /* Either a message has been successfully received and written to the two spool
4234 files, or an error in writing the spool has occurred for an SMTP message, or
4235 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4236 we will have already given up because there's no point in carrying on!) In
4237 either event, we must now close (and thereby unlock) the data file. In the
4238 successful case, this leaves the message on the spool, ready for delivery. In
4239 the error case, the spool file will be deleted. Then tidy up store, interact
4240 with an SMTP call if necessary, and return.
4242 A fflush() was done earlier in the expectation that any write errors on the
4243 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4244 possible for fclose() to fail - but what to do? What has happened to the lock
4249 process_info[process_info_len] = 0; /* Remove message id */
4250 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4252 /* Now reset signal handlers to their defaults */
4254 signal(SIGTERM, SIG_DFL);
4255 signal(SIGINT, SIG_DFL);
4257 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4258 value, which defaults TRUE - meaning there may be more incoming messages from
4259 this connection. For non-SMTP callers (where there is only ever one message),
4260 the default is FALSE. */
4266 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4267 is set to the response that should be sent. When it is NULL, we generate
4268 default responses. After an ACL error or local_scan() error, the response has
4269 already been sent, and smtp_reply is an empty string to indicate this. */
4271 if (!smtp_batched_input)
4275 if (fake_response != OK)
4276 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4277 3, TRUE, fake_response_text);
4279 /* An OK response is required; use "message" text if present. */
4283 uschar *code = US"250";
4285 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4286 smtp_respond(code, len, TRUE, user_msg);
4289 /* Default OK response */
4291 else if (chunking_state > CHUNKING_OFFERED)
4293 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4294 chunking_datasize, message_size+message_linecount, message_id);
4295 chunking_state = CHUNKING_OFFERED;
4298 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4302 "\n**** SMTP testing: that is not a real message id!\n\n");
4305 /* smtp_reply is set non-empty */
4307 else if (smtp_reply[0] != 0)
4308 if (fake_response != OK && (smtp_reply[0] == '2'))
4309 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4310 fake_response_text);
4312 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4314 switch (cutthrough_done)
4317 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4319 /* Delete spool files */
4320 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4321 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4322 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4326 if (cutthrough.defer_pass)
4328 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4329 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4330 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4335 if (cutthrough_done != NOT_TRIED)
4337 message_id[0] = 0; /* Prevent a delivery from starting */
4338 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4339 cutthrough.defer_pass = FALSE;
4343 /* For batched SMTP, generate an error message on failure, and do
4344 nothing on success. The function moan_smtp_batch() does not return -
4345 it exits from the program with a non-zero return code. */
4347 else if (smtp_reply)
4348 moan_smtp_batch(NULL, "%s", smtp_reply);
4352 /* If blackholing, we can immediately log this message's sad fate. The data
4353 file has already been unlinked, and the header file was never written to disk.
4354 We must now indicate that nothing was received, to prevent a delivery from
4359 const uschar *detail = local_scan_data
4360 ? string_printing(local_scan_data)
4361 : string_sprintf("(%s discarded recipients)", blackholed_by);
4362 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4363 log_write(0, LOG_MAIN, "Completed");
4367 /* Reset headers so that logging of rejects for a subsequent message doesn't
4368 include them. It is also important to set header_last = NULL before exiting
4369 from this function, as this prevents certain rewrites that might happen during
4370 subsequent verifying (of another incoming message) from trying to add headers
4371 when they shouldn't. */
4373 header_list = header_last = NULL;
4375 return yield; /* TRUE if more messages (SMTP only) */
4378 /* End of receive.c */