1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
13 #ifdef EXPERIMENTAL_DCC
21 /*************************************************
22 * Local static variables *
23 *************************************************/
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
30 #ifdef HAVE_LOCAL_SCAN
31 jmp_buf local_scan_env; /* error-handling context for local_scan */
32 unsigned had_local_scan_crash;
33 unsigned had_local_scan_timeout;
37 /*************************************************
38 * Non-SMTP character reading functions *
39 *************************************************/
41 /* These are the default functions that are set up in the variables such as
42 receive_getc initially. They just call the standard functions, passing stdin as
43 the file. (When SMTP input is occurring, different functions are used by
44 changing the pointer variables.) */
47 stdin_getc(unsigned lim)
53 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
54 log_write(L_lost_incoming_connection,
55 LOG_MAIN, "timed out while reading local message");
56 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
60 if (filter_test == FTEST_NONE)
62 fprintf(stderr, "\nexim: %s received - message abandoned\n",
63 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
64 log_write(0, LOG_MAIN, "%s received while reading local message",
65 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
67 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
75 return ungetc(c, stdin);
93 /*************************************************
94 * Check that a set sender is allowed *
95 *************************************************/
97 /* This function is called when a local caller sets an explicit sender address.
98 It checks whether this is permitted, which it is for trusted callers.
99 Otherwise, it must match the pattern(s) in untrusted_set_sender.
101 Arguments: the proposed sender address
102 Returns: TRUE for a trusted caller
103 TRUE if the address has been set, untrusted_set_sender has been
104 set, and the address matches something in the list
109 receive_check_set_sender(uschar *newsender)
112 if (f.trusted_caller) return TRUE;
113 if (!newsender || !untrusted_set_sender) return FALSE;
114 qnewsender = Ustrchr(newsender, '@')
115 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
116 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
122 /*************************************************
123 * Read space info for a partition *
124 *************************************************/
126 /* This function is called by receive_check_fs() below, and also by string
127 expansion for variables such as $spool_space. The field names for the statvfs
128 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
129 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
130 have inodes, and they return -1 for the number available.
132 Later: It turns out that some file systems that do not have the concept of
133 inodes return 0 rather than -1. Such systems should also return 0 for the total
134 number of inodes, so we require that to be greater than zero before returning
138 isspool TRUE for spool partition, FALSE for log partition
139 inodeptr address of int to receive inode count; -1 if there isn't one
141 Returns: available on-root space, in kilobytes
142 -1 for log partition if there isn't one
144 All values are -1 if the STATFS functions are not available.
148 receive_statvfs(BOOL isspool, int *inodeptr)
151 struct STATVFS statbuf;
157 /* The spool directory must always exist. */
161 path = spool_directory;
165 /* Need to cut down the log file path to the directory, and to ignore any
166 appearance of "syslog" in it. */
170 int sep = ':'; /* Not variable - outside scripts use */
171 const uschar *p = log_file_path;
174 /* An empty log_file_path means "use the default". This is the same as an
175 empty item in a list. */
177 if (*p == 0) p = US":";
178 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
179 if (Ustrcmp(path, "syslog") != 0)
182 if (path == NULL) /* No log files */
188 /* An empty string means use the default, which is in the spool directory.
189 But don't just use the spool directory, as it is possible that the log
190 subdirectory has been symbolically linked elsewhere. */
194 sprintf(CS buffer, CS"%s/log", CS spool_directory);
200 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
204 /* We now have the path; do the business */
206 memset(&statbuf, 0, sizeof(statbuf));
208 if (STATVFS(CS path, &statbuf) != 0)
209 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
210 { /* Can happen on first run after installation */
216 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
217 "%s directory %s: %s", name, path, strerror(errno));
218 smtp_closedown(US"spool or log directory problem");
219 exim_exit(EXIT_FAILURE, NULL);
222 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
224 /* Disks are getting huge. Take care with computing the size in kilobytes. */
226 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
229 /* Unable to find partition sizes in this environment. */
239 /*************************************************
240 * Check space on spool and log partitions *
241 *************************************************/
243 /* This function is called before accepting a message; if any thresholds are
244 set, it checks them. If a message_size is supplied, it checks that there is
245 enough space for that size plus the threshold - i.e. that the message won't
246 reduce the space to the threshold. Not all OS have statvfs(); for those that
247 don't, this function always returns TRUE. For some OS the old function and
248 struct name statfs is used; that is handled by a macro, defined in exim.h.
251 msg_size the (estimated) size of an incoming message
253 Returns: FALSE if there isn't enough space, or if the information cannot
255 TRUE if no check was done or there is enough space
259 receive_check_fs(int msg_size)
261 int_eximarith_t space;
264 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
266 space = receive_statvfs(TRUE, &inodes);
269 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
270 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
271 space, inodes, check_spool_space, check_spool_inodes, msg_size);
273 if ((space >= 0 && space < check_spool_space) ||
274 (inodes >= 0 && inodes < check_spool_inodes))
276 log_write(0, LOG_MAIN, "spool directory space check failed: space="
277 PR_EXIM_ARITH " inodes=%d", space, inodes);
282 if (check_log_space > 0 || check_log_inodes > 0)
284 space = receive_statvfs(FALSE, &inodes);
287 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
288 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
289 space, inodes, check_log_space, check_log_inodes);
291 if ( space >= 0 && space < check_log_space
292 || inodes >= 0 && inodes < check_log_inodes)
294 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
295 " inodes=%d", space, inodes);
305 /*************************************************
306 * Bomb out while reading a message *
307 *************************************************/
309 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
310 received, or if there is a timeout. A rarer case might be if the log files are
311 screwed up and Exim can't open them to record a message's arrival. Handling
312 that case is done by setting a flag to cause the log functions to call this
313 function if there is an ultimate disaster. That is why it is globally
317 reason text reason to pass to the not-quit ACL
318 msg default SMTP response to give if in an SMTP session
323 receive_bomb_out(uschar *reason, uschar *msg)
325 static BOOL already_bombing_out;
326 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
327 timeouts, if someone has something slow in their quit ACL. Since the only
328 things we should be doing are to close down cleanly ASAP, on the second
329 pass we also close down stuff that might be opened again, before bypassing
330 the ACL call and exiting. */
332 /* If spool_name is set, it contains the name of the data file that is being
333 written. Unlink it before closing so that it cannot be picked up by a delivery
334 process. Ensure that any header file is also removed. */
336 if (spool_name[0] != '\0')
339 spool_name[Ustrlen(spool_name) - 1] = 'H';
341 spool_name[0] = '\0';
344 /* Now close the file if it is open, either as a fd or a stream. */
348 (void)fclose(spool_data_file);
349 spool_data_file = NULL;
351 else if (data_fd >= 0)
353 (void)close(data_fd);
357 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
358 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
361 if (!already_bombing_out)
363 already_bombing_out = TRUE;
366 if (smtp_batched_input)
367 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
368 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
369 smtp_active_hostname, msg);
373 /* Exit from the program (non-BSMTP cases) */
375 exim_exit(EXIT_FAILURE, NULL);
379 /*************************************************
380 * Data read timeout *
381 *************************************************/
383 /* Handler function for timeouts that occur while reading the data that
386 Argument: the signal number
391 data_timeout_handler(int sig)
393 had_data_timeout = sig;
398 #ifdef HAVE_LOCAL_SCAN
399 /*************************************************
400 * local_scan() timeout *
401 *************************************************/
403 /* Handler function for timeouts that occur while running a local_scan()
404 function. Posix recommends against calling longjmp() from a signal-handler,
405 but the GCC manual says you can so we will, and trust that it's better than
406 calling probably non-signal-safe funxtions during logging from within the
407 handler, even with other compilers.
409 See also https://cwe.mitre.org/data/definitions/745.html which also lists
412 This is all because we have no control over what might be written for a
413 local-scan function, so cannot sprinkle had-signal checks after each
414 call-site. At least with the default "do-nothing" function we won't
417 Argument: the signal number
422 local_scan_timeout_handler(int sig)
424 had_local_scan_timeout = sig;
425 siglongjmp(local_scan_env, 1);
430 /*************************************************
431 * local_scan() crashed *
432 *************************************************/
434 /* Handler function for signals that occur while running a local_scan()
437 Argument: the signal number
442 local_scan_crash_handler(int sig)
444 had_local_scan_crash = sig;
445 siglongjmp(local_scan_env, 1);
448 #endif /*HAVE_LOCAL_SCAN*/
451 /*************************************************
452 * SIGTERM or SIGINT received *
453 *************************************************/
455 /* Handler for SIGTERM or SIGINT signals that occur while reading the
456 data that comprises a message.
458 Argument: the signal number
463 data_sigterm_sigint_handler(int sig)
465 had_data_sigint = sig;
470 /*************************************************
471 * Add new recipient to list *
472 *************************************************/
474 /* This function builds a list of recipient addresses in argc/argv
478 recipient the next address to add to recipients_list
479 pno parent number for fixed aliases; -1 otherwise
485 receive_add_recipient(uschar *recipient, int pno)
487 if (recipients_count >= recipients_list_max)
489 recipient_item *oldlist = recipients_list;
490 int oldmax = recipients_list_max;
491 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
492 recipients_list = store_get(recipients_list_max * sizeof(recipient_item), FALSE);
494 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
497 recipients_list[recipients_count].address = recipient;
498 recipients_list[recipients_count].pno = pno;
499 #ifdef EXPERIMENTAL_BRIGHTMAIL
500 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
501 /* reset optin string pointer for next recipient */
502 bmi_current_optin = NULL;
504 recipients_list[recipients_count].orcpt = NULL;
505 recipients_list[recipients_count].dsn_flags = 0;
506 recipients_list[recipients_count++].errors_to = NULL;
512 /*************************************************
513 * Send user response message *
514 *************************************************/
516 /* This function is passed a default response code and a user message. It calls
517 smtp_message_code() to check and possibly modify the response code, and then
518 calls smtp_respond() to transmit the response. I put this into a function
519 just to avoid a lot of repetition.
522 code the response code
523 user_msg the user message
530 smtp_user_msg(uschar *code, uschar *user_msg)
533 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
534 smtp_respond(code, len, TRUE, user_msg);
542 /*************************************************
543 * Remove a recipient from the list *
544 *************************************************/
546 /* This function is provided for local_scan() to use.
549 recipient address to remove
551 Returns: TRUE if it did remove something; FALSE otherwise
555 receive_remove_recipient(uschar *recipient)
557 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
559 for (int count = 0; count < recipients_count; count++)
560 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
562 if ((--recipients_count - count) > 0)
563 memmove(recipients_list + count, recipients_list + count + 1,
564 (recipients_count - count)*sizeof(recipient_item));
574 /* Pause for a while waiting for input. If none received in that time,
575 close the logfile, if we had one open; then if we wait for a long-running
576 datasource (months, in one use-case) log rotation will not leave us holding
582 if (!receive_timeout)
585 timesince(&t, &received_time);
586 if (t.tv_sec > 30*60)
591 FD_ZERO(&r); FD_SET(0, &r);
592 t.tv_sec = 30*60 - t.tv_sec; t.tv_usec = 0;
593 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
598 /*************************************************
599 * Read data portion of a non-SMTP message *
600 *************************************************/
602 /* This function is called to read the remainder of a message (following the
603 header) when the input is not from SMTP - we are receiving a local message on
604 a standard input stream. The message is always terminated by EOF, and is also
605 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
606 two cases for maximum efficiency.
608 Ensure that the body ends with a newline. This will naturally be the case when
609 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
610 as "sequences of lines" - this of course strictly applies only to SMTP, but
611 deliveries into BSD-type mailbox files also require it. Exim used to have a
612 flag for doing this at delivery time, but as it was always set for all
613 transports, I decided to simplify things by putting the check here instead.
615 There is at least one MUA (dtmail) that sends CRLF via this interface, and
616 other programs are known to do this as well. Exim used to have a option for
617 dealing with this: in July 2003, after much discussion, the code has been
618 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
620 However, for the case when a dot on a line by itself terminates a message, the
621 only recognized terminating sequences before and after the dot are LF and CRLF.
622 Otherwise, having read EOL . CR, you don't know whether to read another
625 Internally, in messages stored in Exim's spool files, LF is used as the line
626 terminator. Under the new regime, bare CRs will no longer appear in these
630 fout a FILE to which to write the message
632 Returns: One of the END_xxx values indicating why it stopped reading
636 read_message_data(FILE *fout)
640 register int linelength = 0;
642 /* Handle the case when only EOF terminates the message */
649 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
652 if (ch == 0) body_zerocount++;
653 if (last_ch == '\r' && ch != '\n')
655 if (linelength > max_received_linelength)
656 max_received_linelength = linelength;
658 if (fputc('\n', fout) == EOF) return END_WERROR;
662 if (ch == '\r') continue;
664 if (fputc(ch, fout) == EOF) return END_WERROR;
667 if (linelength > max_received_linelength)
668 max_received_linelength = linelength;
673 if (++message_size > thismessage_size_limit) return END_SIZE;
678 if (linelength > max_received_linelength)
679 max_received_linelength = linelength;
680 if (fputc('\n', fout) == EOF) return END_WERROR;
688 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
692 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
694 if (ch == 0) body_zerocount++;
697 case 0: /* Normal state (previous char written) */
701 if (linelength > max_received_linelength)
702 max_received_linelength = linelength;
707 { ch_state = 2; continue; }
710 case 1: /* After written "\n" */
711 if (ch == '.') { ch_state = 3; continue; }
712 if (ch == '\r') { ch_state = 2; continue; }
713 if (ch == '\n') { body_linecount++; linelength = -1; }
718 body_linecount++; /* After unwritten "\r" */
719 if (linelength > max_received_linelength)
720 max_received_linelength = linelength;
728 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
729 if (ch == '\r') continue;
735 case 3: /* After "\n." (\n written, dot not) */
736 if (ch == '\n') return END_DOT;
737 if (ch == '\r') { ch_state = 4; continue; }
740 if (fputc('.', fout) == EOF) return END_WERROR;
744 case 4: /* After "\n.\r" (\n written, rest not) */
745 if (ch == '\n') return END_DOT;
748 if (fputs(".\n", fout) == EOF) return END_WERROR;
749 if (ch == '\r') { ch_state = 2; continue; }
755 if (fputc(ch, fout) == EOF) return END_WERROR;
756 if (++message_size > thismessage_size_limit) return END_SIZE;
759 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
760 the message ends with a newline, and we must also write any characters that
761 were saved up while testing for an ending dot. */
765 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
766 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
767 message_size += Ustrlen(ends[ch_state]);
777 /*************************************************
778 * Read data portion of an SMTP message *
779 *************************************************/
781 /* This function is called to read the remainder of an SMTP message (after the
782 headers), or to skip over it when an error has occurred. In this case, the
783 output file is passed as NULL.
785 If any line begins with a dot, that character is skipped. The input should only
786 be successfully terminated by CR LF . CR LF unless it is local (non-network)
787 SMTP, in which case the CRs are optional, but...
789 FUDGE: It seems that sites on the net send out messages with just LF
790 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
791 we make the CRs optional in all cases.
793 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
794 well, so that there are no CRs in spooled messages. However, the message
795 terminating dot is not recognized between two bare CRs.
798 fout a FILE to which to write the message; NULL if skipping
800 Returns: One of the END_xxx values indicating why it stopped reading
804 read_message_data_smtp(FILE *fout)
810 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
812 if (ch == 0) body_zerocount++;
815 case 0: /* After LF or CRLF */
819 continue; /* Don't ever write . after LF */
823 /* Else fall through to handle as normal uschar. */
825 case 1: /* Normal state */
830 if (linelength > max_received_linelength)
831 max_received_linelength = linelength;
841 case 2: /* After (unwritten) CR */
843 if (linelength > max_received_linelength)
844 max_received_linelength = linelength;
853 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
854 cutthrough_data_put_nl();
855 if (ch != '\r') ch_state = 1; else continue;
859 case 3: /* After [CR] LF . */
867 /* The dot was removed at state 3. For a doubled dot, here, reinstate
868 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
869 and to file below. */
873 cutthrough_data_puts(&c, 1);
878 case 4: /* After [CR] LF . CR */
879 if (ch == '\n') return END_DOT;
882 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
883 cutthrough_data_put_nl();
893 /* Add the character to the spool file, unless skipping; then loop for the
900 if (fputc(ch, fout) == EOF) return END_WERROR;
901 if (message_size > thismessage_size_limit) return END_SIZE;
904 cutthrough_data_put_nl();
908 cutthrough_data_puts(&c, 1);
912 /* Fall through here if EOF encountered. This indicates some kind of error,
913 since a correct message is terminated by [CR] LF . [CR] LF. */
921 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
922 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
923 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
924 body_linecount accounting for proper re-expansion for the wire, so use
925 a cut-down version of the state-machine above; we don't need to do leading-dot
926 detection and unstuffing.
929 fout a FILE to which to write the message; NULL if skipping;
930 must be open for both writing and reading.
932 Returns: One of the END_xxx values indicating why it stopped reading
936 read_message_bdat_smtp(FILE *fout)
938 int linelength = 0, ch;
939 enum CH_STATE ch_state = LF_SEEN;
944 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
946 case EOF: return END_EOF;
947 case ERR: return END_PROTOCOL;
949 /* Nothing to get from the sender anymore. We check the last
950 character written to the spool.
952 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
953 If we would be strict, we would refuse such broken messages.
954 But we are liberal, so we fix it. It would be easy just to append
955 the "\n" to the spool.
957 But there are some more things (line counting, message size calculation and such),
958 that would need to be duplicated here. So we simply do some ungetc
963 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
964 if (fgetc(fout) == '\n') return END_DOT;
967 if (linelength == -1) /* \r already seen (see below) */
969 DEBUG(D_receive) debug_printf("Add missing LF\n");
973 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
974 bdat_ungetc('\r'); /* not even \r was seen */
978 case '\0': body_zerocount++; break;
982 case LF_SEEN: /* After LF or CRLF */
984 /* fall through to handle as normal uschar. */
986 case MID_LINE: /* Mid-line state */
991 if (linelength > max_received_linelength)
992 max_received_linelength = linelength;
998 if (fix_nl) bdat_ungetc('\n');
999 continue; /* don't write CR */
1003 case CR_SEEN: /* After (unwritten) CR */
1005 if (linelength > max_received_linelength)
1006 max_received_linelength = linelength;
1013 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1014 cutthrough_data_put_nl();
1015 if (ch == '\r') continue; /* don't write CR */
1016 ch_state = MID_LINE;
1021 /* Add the character to the spool file, unless skipping */
1027 if (fputc(ch, fout) == EOF) return END_WERROR;
1028 if (message_size > thismessage_size_limit) return END_SIZE;
1031 cutthrough_data_put_nl();
1035 cutthrough_data_puts(&c, 1);
1042 read_message_bdat_smtp_wire(FILE *fout)
1046 /* Remember that this message uses wireformat. */
1048 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1049 fout ? "writing spoolfile in wire format" : "flushing input");
1050 f.spool_file_wireformat = TRUE;
1054 if (chunking_data_left > 0)
1056 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1057 uschar * buf = bdat_getbuf(&len);
1059 if (!buf) return END_EOF;
1060 message_size += len;
1061 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1063 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1065 case EOF: return END_EOF;
1066 case EOD: return END_DOT;
1067 case ERR: return END_PROTOCOL;
1073 max_received_linelength
1077 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1080 if (message_size > thismessage_size_limit) return END_SIZE;
1088 /*************************************************
1089 * Swallow SMTP message *
1090 *************************************************/
1092 /* This function is called when there has been some kind of error while reading
1093 an SMTP message, and the remaining data may need to be swallowed. It is global
1094 because it is called from smtp_closedown() to shut down an incoming call
1097 Argument: a FILE from which to read the message
1102 receive_swallow_smtp(void)
1104 if (message_ended >= END_NOTENDED)
1105 message_ended = chunking_state <= CHUNKING_OFFERED
1106 ? read_message_data_smtp(NULL)
1107 : read_message_bdat_smtp_wire(NULL);
1112 /*************************************************
1113 * Handle lost SMTP connection *
1114 *************************************************/
1116 /* This function logs connection loss incidents and generates an appropriate
1119 Argument: additional data for the message
1120 Returns: the SMTP response
1124 handle_lost_connection(uschar *s)
1126 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1127 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1128 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1129 return US"421 Lost incoming connection";
1135 /*************************************************
1136 * Handle a non-smtp reception error *
1137 *************************************************/
1139 /* This function is called for various errors during the reception of non-SMTP
1140 messages. It either sends a message to the sender of the problem message, or it
1141 writes to the standard error stream.
1144 errcode code for moan_to_sender(), identifying the error
1145 text1 first message text, passed to moan_to_sender()
1146 text2 second message text, used only for stderrr
1147 error_rc code to pass to exim_exit if no problem
1148 f FILE containing body of message (may be stdin)
1149 hptr pointer to instore headers or NULL
1151 Returns: calls exim_exit(), which does not return
1155 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1156 FILE *f, header_line *hptr)
1158 if (error_handling == ERRORS_SENDER)
1162 eblock.text1 = text1;
1163 eblock.text2 = US"";
1164 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1165 error_rc = EXIT_FAILURE;
1168 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1170 exim_exit(error_rc, US"");
1175 /*************************************************
1176 * Add header lines set up by ACL *
1177 *************************************************/
1179 /* This function is called to add the header lines that were set up by
1180 statements in an ACL to the list of headers in memory. It is done in two stages
1181 like this, because when the ACL for RCPT is running, the other headers have not
1182 yet been received. This function is called twice; once just before running the
1183 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1184 are visible to the DATA ACL.
1186 Originally these header lines were added at the end. Now there is support for
1187 three different places: top, bottom, and after the Received: header(s). There
1188 will always be at least one Received: header, even if it is marked deleted, and
1189 even if something else has been put in front of it.
1192 acl_name text to identify which ACL
1198 add_acl_headers(int where, uschar *acl_name)
1200 header_line *last_received = NULL;
1204 case ACL_WHERE_DKIM:
1205 case ACL_WHERE_MIME:
1206 case ACL_WHERE_DATA:
1207 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1208 && (acl_removed_headers || acl_added_headers))
1210 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1211 " will not take effect on cutthrough deliveries");
1216 if (acl_removed_headers)
1218 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1220 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1222 const uschar * list = acl_removed_headers;
1223 int sep = ':'; /* This is specified as a colon-separated list */
1227 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1228 if (header_testname(h, s, Ustrlen(s), FALSE))
1230 h->type = htype_old;
1231 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1234 acl_removed_headers = NULL;
1235 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1238 if (!acl_added_headers) return;
1239 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1241 for (header_line * h = acl_added_headers, * next; h; h = next)
1248 h->next = header_list;
1250 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1256 last_received = header_list;
1257 while (!header_testname(last_received, US"Received", 8, FALSE))
1258 last_received = last_received->next;
1259 while (last_received->next &&
1260 header_testname(last_received->next, US"Received", 8, FALSE))
1261 last_received = last_received->next;
1263 h->next = last_received->next;
1264 last_received->next = h;
1265 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1269 /* add header before any header which is NOT Received: or Resent- */
1270 last_received = header_list;
1271 while ( last_received->next &&
1272 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1273 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1274 last_received = last_received->next;
1275 /* last_received now points to the last Received: or Resent-* header
1276 in an uninterrupted chain of those header types (seen from the beginning
1277 of all headers. Our current header must follow it. */
1278 h->next = last_received->next;
1279 last_received->next = h;
1280 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1285 header_last->next = h;
1286 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1290 if (!h->next) header_last = h;
1292 /* Check for one of the known header types (From:, To:, etc.) though in
1293 practice most added headers are going to be "other". Lower case
1294 identification letters are never stored with the header; they are used
1295 for existence tests when messages are received. So discard any lower case
1298 h->type = header_checkname(h, FALSE);
1299 if (h->type >= 'a') h->type = htype_other;
1301 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1304 acl_added_headers = NULL;
1305 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1310 /*************************************************
1311 * Add host information for log line *
1312 *************************************************/
1314 /* Called for acceptance and rejecting log lines. This adds information about
1315 the calling host to a string that is being built dynamically.
1318 s the dynamic string
1320 Returns: the extended string
1324 add_host_info_for_log(gstring * g)
1326 if (sender_fullhost)
1328 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1329 g = string_catn(g, US" DS", 3);
1330 g = string_append(g, 2, US" H=", sender_fullhost);
1331 if (LOGGING(incoming_interface) && interface_address)
1332 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1334 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1336 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1337 f.tcp_in_fastopen_logged = TRUE;
1340 g = string_append(g, 2, US" U=", sender_ident);
1341 if (received_protocol)
1342 g = string_append(g, 2, US" P=", received_protocol);
1343 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1345 g = string_catn(g, US" L", 2);
1346 #ifndef DISABLE_PIPE_CONNECT
1347 if (f.smtp_in_early_pipe_used)
1348 g = string_catn(g, US"*", 1);
1349 else if (f.smtp_in_early_pipe_advertised)
1350 g = string_catn(g, US".", 1);
1352 if (!f.smtp_in_pipelining_used)
1353 g = string_catn(g, US"-", 1);
1360 #ifdef WITH_CONTENT_SCAN
1362 /*************************************************
1363 * Run the MIME ACL on a message *
1364 *************************************************/
1366 /* This code is in a subroutine so that it can be used for both SMTP
1367 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1370 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1371 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1372 smtp_reply_ptr Where SMTP reply is being built
1373 blackholed_by_ptr Where "blackholed by" message is being built
1375 Returns: TRUE to carry on; FALSE to abandon the message
1379 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1380 uschar **blackholed_by_ptr)
1383 uschar * rfc822_file_path = NULL;
1384 unsigned long mbox_size;
1385 uschar *user_msg, *log_msg;
1386 int mime_part_count_buffer = -1;
1387 uschar * mbox_filename;
1390 /* check if it is a MIME message */
1392 for (header_line * my_headerlist = header_list; my_headerlist;
1393 my_headerlist = my_headerlist->next)
1394 if ( my_headerlist->type != '*' /* skip deleted headers */
1395 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1398 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1402 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1407 /* make sure the eml mbox file is spooled up */
1408 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1409 { /* error while spooling */
1410 log_write(0, LOG_MAIN|LOG_PANIC,
1411 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1412 Uunlink(spool_name);
1414 #ifdef EXPERIMENTAL_DCC
1417 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1418 message_id[0] = 0; /* Indicate no message accepted */
1419 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1420 return FALSE; /* Indicate skip to end of receive function */
1426 mime_part_count = -1;
1427 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1428 (void)fclose(mbox_file);
1430 if (rfc822_file_path)
1432 mime_part_count = mime_part_count_buffer;
1434 if (unlink(CS rfc822_file_path) == -1)
1436 log_write(0, LOG_PANIC,
1437 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1440 rfc822_file_path = NULL;
1443 /* check if we must check any message/rfc822 attachments */
1446 uschar * scandir = string_copyn(mbox_filename,
1447 Ustrrchr(mbox_filename, '/') - mbox_filename);
1448 struct dirent * entry;
1451 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1452 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1454 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1456 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1462 if (rfc822_file_path)
1464 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1466 /* set RFC822 expansion variable */
1468 mime_part_count_buffer = mime_part_count;
1469 goto MIME_ACL_CHECK;
1471 log_write(0, LOG_PANIC,
1472 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1473 unlink(CS rfc822_file_path);
1478 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1481 recipients_count = 0;
1482 *blackholed_by_ptr = US"MIME ACL";
1483 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1487 Uunlink(spool_name);
1488 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1490 #ifdef EXPERIMENTAL_DCC
1495 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1496 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1497 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1499 message_id[0] = 0; /* Indicate no message accepted */
1500 return FALSE; /* Cause skip to end of receive function */
1506 #endif /* WITH_CONTENT_SCAN */
1511 received_header_gen(void)
1515 header_line *received_header= header_list;
1517 timestamp = expand_string(US"${tod_full}");
1518 if (recipients_count == 1) received_for = recipients_list[0].address;
1519 received = expand_string(received_header_text);
1520 received_for = NULL;
1524 if(spool_name[0] != 0)
1525 Uunlink(spool_name); /* Lose the data file */
1526 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1527 "(received_header_text) failed: %s", string_printing(received_header_text),
1528 expand_string_message);
1531 /* The first element on the header chain is reserved for the Received header,
1532 so all we have to do is fill in the text pointer, and set the type. However, if
1533 the result of the expansion is an empty string, we leave the header marked as
1534 "old" so as to refrain from adding a Received header. */
1536 if (received[0] == 0)
1538 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1539 received_header->type = htype_old;
1543 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1544 received_header->type = htype_received;
1547 received_header->slen = Ustrlen(received_header->text);
1549 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1550 received_header->type, received_header->text);
1555 /*************************************************
1557 *************************************************/
1559 /* Receive a message on the given input, and put it into a pair of spool files.
1560 Either a non-null list of recipients, or the extract flag will be true, or
1561 both. The flag sender_local is true for locally generated messages. The flag
1562 submission_mode is true if an ACL has obeyed "control = submission". The flag
1563 suppress_local_fixups is true if an ACL has obeyed "control =
1564 suppress_local_fixups" or -G was passed on the command-line.
1565 The flag smtp_input is true if the message is to be
1566 handled using SMTP conventions about termination and lines starting with dots.
1567 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1569 If a message was successfully read, message_id[0] will be non-zero.
1571 The general actions of this function are:
1573 . Read the headers of the message (if any) into a chain of store
1576 . If there is a "sender:" header and the message is locally originated,
1577 throw it away, unless the caller is trusted, or unless
1578 active_local_sender_retain is set - which can only happen if
1579 active_local_from_check is false.
1581 . If recipients are to be extracted from the message, build the
1582 recipients list from the headers, removing any that were on the
1583 original recipients list (unless extract_addresses_remove_arguments is
1584 false), and at the same time, remove any bcc header that may be present.
1586 . Get the spool file for the data, sort out its unique name, open
1587 and lock it (but don't give it the name yet).
1589 . Generate a "Message-Id" header if the message doesn't have one, for
1590 locally-originated messages.
1592 . Generate a "Received" header.
1594 . Ensure the recipients list is fully qualified and rewritten if necessary.
1596 . If there are any rewriting rules, apply them to the sender address
1597 and also to the headers.
1599 . If there is no from: header, generate one, for locally-generated messages
1600 and messages in "submission mode" only.
1602 . If the sender is local, check that from: is correct, and if not, generate
1603 a Sender: header, unless message comes from a trusted caller, or this
1604 feature is disabled by active_local_from_check being false.
1606 . If there is no "date" header, generate one, for locally-originated
1607 or submission mode messages only.
1609 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1610 dot_ends mode, to the data file. Leave it open, to hold the lock.
1612 . Write the envelope and the headers to a new file.
1614 . Set the name for the header file; close it.
1616 . Set the name for the data file; close it.
1618 Because this function can potentially be called many times in a single
1619 SMTP connection, all store should be got by store_get(), so that it will be
1620 automatically retrieved after the message is accepted.
1622 FUDGE: It seems that sites on the net send out messages with just LF
1623 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1624 we make the CRs optional in all cases.
1626 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1627 new regime is now in place in which bare CRs in header lines are turned into LF
1628 followed by a space, so as not to terminate the header line.
1630 February 2004: A bare LF in a header line in a message whose first line was
1631 terminated by CRLF is treated in the same way as a bare CR.
1634 extract_recip TRUE if recipients are to be extracted from the message's
1637 Returns: TRUE there are more messages to be read (SMTP input)
1638 FALSE there are no more messages to be read (non-SMTP input
1639 or SMTP connection collapsed, or other failure)
1641 When reading a message for filter testing, the returned value indicates
1642 whether the headers (which is all that is read) were terminated by '.' or
1646 receive_msg(BOOL extract_recip)
1650 int process_info_len = Ustrlen(process_info);
1651 int error_rc = error_handling == ERRORS_SENDER
1652 ? errors_sender_rc : EXIT_FAILURE;
1653 int header_size = 256;
1654 int start, end, domain;
1655 int id_resolution = 0;
1657 int prevlines_length = 0;
1661 BOOL contains_resent_headers = FALSE;
1662 BOOL extracted_ignored = FALSE;
1663 BOOL first_line_ended_crlf = TRUE_UNSET;
1664 BOOL smtp_yield = TRUE;
1667 BOOL resents_exist = FALSE;
1668 uschar *resent_prefix = US"";
1669 uschar *blackholed_by = NULL;
1670 uschar *blackhole_log_msg = US"";
1671 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1674 error_block *bad_addresses = NULL;
1676 uschar *frozen_by = NULL;
1677 uschar *queued_by = NULL;
1680 rmark rcvd_log_reset_point;
1682 struct stat statbuf;
1684 /* Final message to give to SMTP caller, and messages from ACLs */
1686 uschar *smtp_reply = NULL;
1687 uschar *user_msg, *log_msg;
1689 /* Working header pointers */
1694 /* Flags for noting the existence of certain headers (only one left) */
1696 BOOL date_header_exists = FALSE;
1698 /* Pointers to receive the addresses of headers whose contents we need. */
1700 header_line *from_header = NULL;
1701 header_line *subject_header = NULL;
1702 header_line *msgid_header = NULL;
1703 header_line *received_header;
1704 BOOL msgid_header_newly_created = FALSE;
1706 /* Variables for use when building the Received: header. */
1712 /* Release any open files that might have been cached while preparing to
1713 accept the message - e.g. by verifying addresses - because reading a message
1714 might take a fair bit of real time. */
1718 /* Extracting the recipient list from an input file is incompatible with
1719 cutthrough delivery with the no-spool option. It shouldn't be possible
1720 to set up the combination, but just in case kill any ongoing connection. */
1721 if (extract_recip || !smtp_input)
1722 cancel_cutthrough_connection(TRUE, US"not smtp input");
1724 /* Initialize the chain of headers by setting up a place-holder for Received:
1725 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1726 pointing to the end of the chain to make adding headers simple. */
1728 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1729 header_list->next = NULL;
1730 header_list->type = htype_old;
1731 header_list->text = NULL;
1732 header_list->slen = 0;
1734 /* Control block for the next header to be read. */
1736 reset_point = store_mark();
1737 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1738 next->text = store_get(header_size, TRUE); /* tainted */
1740 /* Initialize message id to be null (indicating no message read), and the
1741 header names list to be the normal list. Indicate there is no data file open
1742 yet, initialize the size and warning count, and deal with no size limit. */
1745 spool_data_file = NULL;
1750 received_count = 1; /* For the one we will add */
1752 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1754 /* While reading the message, the following counts are computed. */
1756 message_linecount = body_linecount = body_zerocount =
1757 max_received_linelength = 0;
1759 #ifndef DISABLE_DKIM
1760 /* Call into DKIM to set up the context. In CHUNKING mode
1761 we clear the dot-stuffing flag */
1762 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1763 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1766 #ifdef SUPPORT_DMARC
1767 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1770 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1771 ids, and fractions of a second are required. See the comments that precede the
1772 message id creation below. */
1774 (void)gettimeofday(&message_id_tv, NULL);
1776 /* For other uses of the received time we can operate with granularity of one
1777 second, and for that we use the global variable received_time. This is for
1778 things like ultimate message timeouts. */
1780 received_time = message_id_tv;
1782 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1783 happen in the smtp_getc() function when it refills its buffer. */
1785 had_data_timeout = 0;
1787 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1789 /* If not SMTP input, timeout happens only if configured, and we just set a
1790 single timeout for the whole message. */
1792 else if (receive_timeout > 0)
1794 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1795 ALARM(receive_timeout);
1798 /* SIGTERM and SIGINT are caught always. */
1800 had_data_sigint = 0;
1801 signal(SIGTERM, data_sigterm_sigint_handler);
1802 signal(SIGINT, data_sigterm_sigint_handler);
1804 /* Header lines in messages are not supposed to be very long, though when
1805 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1806 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1807 storing the header, and extend this as necessary using string_cat().
1809 To cope with total lunacies, impose an upper limit on the length of the header
1810 section of the message, as otherwise the store will fill up. We must also cope
1811 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1812 Folded header lines are joined into one string, leaving the '\n' characters
1813 inside them, so that writing them out reproduces the input.
1815 Loop for each character of each header; the next structure for chaining the
1816 header is set up already, with ptr the offset of the next character in
1821 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1823 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1824 SMTP must have a correct "." terminator. */
1826 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1828 smtp_reply = handle_lost_connection(US" (header)");
1830 goto TIDYUP; /* Skip to end of function */
1833 /* See if we are at the current header's size limit - there must be at least
1834 four bytes left. This allows for the new character plus a zero, plus two for
1835 extra insertions when we are playing games with dots and carriage returns. If
1836 we are at the limit, extend the text buffer. This could have been done
1837 automatically using string_cat() but because this is a tightish loop storing
1838 only one character at a time, we choose to do it inline. Normally
1839 store_extend() will be able to extend the block; only at the end of a big
1840 store block will a copy be needed. To handle the case of very long headers
1841 (and sometimes lunatic messages can have ones that are 100s of K long) we
1842 call store_release() for strings that have been copied - if the string is at
1843 the start of a block (and therefore the only thing in it, because we aren't
1844 doing any other gets), the block gets freed. We can only do this release if
1845 there were no allocations since the once that we want to free. */
1847 if (ptr >= header_size - 4)
1849 int oldsize = header_size;
1851 if (header_size >= INT_MAX/2)
1855 /* The data came from the message, so is tainted. */
1857 if (!store_extend(next->text, TRUE, oldsize, header_size))
1858 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1861 /* Cope with receiving a binary zero. There is dispute about whether
1862 these should be allowed in RFC 822 messages. The middle view is that they
1863 should not be allowed in headers, at least. Exim takes this attitude at
1864 the moment. We can't just stomp on them here, because we don't know that
1865 this line is a header yet. Set a flag to cause scanning later. */
1867 if (ch == 0) had_zero++;
1869 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1870 those from data files use just LF. Treat LF in local SMTP input as a
1871 terminator too. Treat EOF as a line terminator always. */
1873 if (ch == EOF) goto EOL;
1875 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1876 other MTAs accept this. We are therefore forced into this "liberalisation"
1877 too, so we accept LF as a line terminator whatever the source of the message.
1878 However, if the first line of the message ended with a CRLF, we treat a bare
1879 LF specially by inserting a white space after it to ensure that the header
1880 line is not terminated. */
1884 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1885 else if (first_line_ended_crlf) receive_ungetc(' ');
1889 /* This is not the end of the line. If this is SMTP input and this is
1890 the first character in the line and it is a "." character, ignore it.
1891 This implements the dot-doubling rule, though header lines starting with
1892 dots aren't exactly common. They are legal in RFC 822, though. If the
1893 following is CRLF or LF, this is the line that that terminates the
1894 entire message. We set message_ended to indicate this has happened (to
1895 prevent further reading), and break out of the loop, having freed the
1896 empty header, and set next = NULL to indicate no data line. */
1898 if (ptr == 0 && ch == '.' && f.dot_ends)
1900 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1903 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1907 ch = '\r'; /* Revert to CR */
1912 message_ended = END_DOT;
1913 reset_point = store_reset(reset_point);
1915 break; /* End character-reading loop */
1918 /* For non-SMTP input, the dot at the start of the line was really a data
1919 character. What is now in ch is the following character. We guaranteed
1920 enough space for this above. */
1924 next->text[ptr++] = '.';
1929 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1930 remember this case if this is the first line ending. */
1934 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1937 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1941 /* Otherwise, put back the character after CR, and turn the bare CR
1944 ch = (receive_ungetc)(ch);
1945 next->text[ptr++] = '\n';
1950 /* We have a data character for the header line. */
1952 next->text[ptr++] = ch; /* Add to buffer */
1953 message_size++; /* Total message size so far */
1955 /* Handle failure due to a humungously long header section. The >= allows
1956 for the terminating \n. Add what we have so far onto the headers list so
1957 that it gets reflected in any error message, and back up the just-read
1960 if (message_size >= header_maxsize)
1963 next->text[ptr] = 0;
1965 next->type = htype_other;
1967 header_last->next = next;
1970 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1971 "%s (more than %d characters): message abandoned",
1972 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1976 smtp_reply = US"552 Message header is ridiculously long";
1977 receive_swallow_smtp();
1978 goto TIDYUP; /* Skip to end of function */
1983 give_local_error(ERRMESS_VLONGHEADER,
1984 string_sprintf("message header longer than %d characters received: "
1985 "message not accepted", header_maxsize), US"", error_rc, stdin,
1987 /* Does not return */
1991 continue; /* With next input character */
1993 /* End of header line reached */
1997 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1999 receive_linecount++;
2000 message_linecount++;
2002 /* Keep track of maximum line length */
2004 if (ptr - prevlines_length > max_received_linelength)
2005 max_received_linelength = ptr - prevlines_length;
2006 prevlines_length = ptr + 1;
2008 /* Now put in the terminating newline. There is always space for
2009 at least two more characters. */
2011 next->text[ptr++] = '\n';
2014 /* A blank line signals the end of the headers; release the unwanted
2015 space and set next to NULL to indicate this. */
2019 reset_point = store_reset(reset_point);
2024 /* There is data in the line; see if the next input character is a
2025 whitespace character. If it is, we have a continuation of this header line.
2026 There is always space for at least one character at this point. */
2030 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2031 if (nextch == ' ' || nextch == '\t')
2033 next->text[ptr++] = nextch;
2034 if (++message_size >= header_maxsize)
2036 continue; /* Iterate the loop */
2038 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2039 else ch = EOF; /* Cause main loop to exit at end */
2042 /* We have got to the real line end. Terminate the string and release store
2043 beyond it. If it turns out to be a real header, internal binary zeros will
2044 be squashed later. */
2046 next->text[ptr] = 0;
2048 store_release_above(next->text + ptr + 1);
2050 /* Check the running total size against the overall message size limit. We
2051 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2052 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2053 headers - the code to read the body will then also hit the buffer. */
2055 if (message_size > thismessage_size_limit) break;
2057 /* A line that is not syntactically correct for a header also marks
2058 the end of the headers. In this case, we leave next containing the
2059 first data line. This might actually be several lines because of the
2060 continuation logic applied above, but that doesn't matter.
2062 It turns out that smail, and presumably sendmail, accept leading lines
2065 From ph10 Fri Jan 5 12:35 GMT 1996
2067 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2068 find any documentation of this, but for compatibility it had better be
2069 accepted. Exim restricts it to the case of non-smtp messages, and
2070 treats it as an alternative to the -f command line option. Thus it is
2071 ignored except for trusted users or filter testing. Otherwise it is taken
2072 as the sender address, unless -f was used (sendmail compatibility).
2074 It further turns out that some UUCPs generate the From_line in a different
2077 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2079 The regex for matching these things is now capable of recognizing both
2080 formats (including 2- and 4-digit years in the latter). In fact, the regex
2081 is now configurable, as is the expansion string to fish out the sender.
2083 Even further on it has been discovered that some broken clients send
2084 these lines in SMTP messages. There is now an option to ignore them from
2085 specified hosts or networks. Sigh. */
2087 if ( header_last == header_list
2089 || ( sender_host_address
2090 && verify_check_host(&ignore_fromline_hosts) == OK
2092 || (!sender_host_address && ignore_fromline_local)
2094 && regex_match_and_setup(regex_From, next->text, 0, -1)
2097 if (!f.sender_address_forced)
2099 uschar *uucp_sender = expand_string(uucp_from_sender);
2101 log_write(0, LOG_MAIN|LOG_PANIC,
2102 "expansion of \"%s\" failed after matching "
2103 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2106 int start, end, domain;
2108 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2109 &start, &end, &domain, TRUE);
2112 if (domain == 0 && newsender[0] != 0)
2113 newsender = rewrite_address_qualify(newsender, FALSE);
2115 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2117 sender_address = newsender;
2119 if (f.trusted_caller || filter_test != FTEST_NONE)
2121 authenticated_sender = NULL;
2122 originator_name = US"";
2123 f.sender_local = FALSE;
2126 if (filter_test != FTEST_NONE)
2127 printf("Sender taken from \"From \" line\n");
2134 /* Not a leading "From " line. Check to see if it is a valid header line.
2135 Header names may contain any non-control characters except space and colon,
2140 uschar *p = next->text;
2142 /* If not a valid header line, break from the header reading loop, leaving
2143 next != NULL, indicating that it holds the first line of the body. */
2145 if (isspace(*p)) break;
2146 while (mac_isgraph(*p) && *p != ':') p++;
2147 while (isspace(*p)) p++;
2150 body_zerocount = had_zero;
2154 /* We have a valid header line. If there were any binary zeroes in
2155 the line, stomp on them here. */
2158 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2161 /* It is perfectly legal to have an empty continuation line
2162 at the end of a header, but it is confusing to humans
2163 looking at such messages, since it looks like a blank line.
2164 Reduce confusion by removing redundant white space at the
2165 end. We know that there is at least one printing character
2166 (the ':' tested for above) so there is no danger of running
2169 p = next->text + ptr - 2;
2172 while (*p == ' ' || *p == '\t') p--;
2173 if (*p != '\n') break;
2174 ptr = (p--) - next->text + 1;
2175 message_size -= next->slen - ptr;
2176 next->text[ptr] = 0;
2180 /* Add the header to the chain */
2182 next->type = htype_other;
2184 header_last->next = next;
2187 /* Check the limit for individual line lengths. This comes after adding to
2188 the chain so that the failing line is reflected if a bounce is generated
2189 (for a local message). */
2191 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2193 log_write(0, LOG_MAIN, "overlong message header line received from "
2194 "%s (more than %d characters): message abandoned",
2195 f.sender_host_unknown ? sender_ident : sender_fullhost,
2196 header_line_maxsize);
2200 smtp_reply = US"552 A message header line is too long";
2201 receive_swallow_smtp();
2202 goto TIDYUP; /* Skip to end of function */
2206 give_local_error(ERRMESS_VLONGHDRLINE,
2207 string_sprintf("message header line longer than %d characters "
2208 "received: message not accepted", header_line_maxsize), US"",
2209 error_rc, stdin, header_list->next);
2210 /* Does not return */
2213 /* Note if any resent- fields exist. */
2215 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2217 resents_exist = TRUE;
2218 resent_prefix = US"Resent-";
2222 /* Reject CHUNKING messages that do not CRLF their first header line */
2224 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2226 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2227 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2229 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2230 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2231 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2234 goto TIDYUP; /* Skip to end of function */
2237 /* The line has been handled. If we have hit EOF, break out of the loop,
2238 indicating no pending data line. */
2240 if (ch == EOF) { next = NULL; break; }
2242 /* Set up for the next header */
2244 reset_point = store_mark();
2246 next = store_get(sizeof(header_line), FALSE);
2247 next->text = store_get(header_size, TRUE);
2250 prevlines_length = 0;
2251 } /* Continue, starting to read the next header */
2253 /* At this point, we have read all the headers into a data structure in main
2254 store. The first header is still the dummy placeholder for the Received: header
2255 we are going to generate a bit later on. If next != NULL, it contains the first
2256 data line - which terminated the headers before reaching a blank line (not the
2261 debug_printf(">>Headers received:\n");
2262 for (header_line * h = header_list->next; h; h = h->next)
2263 debug_printf("%s", h->text);
2267 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2268 is dropped immediately after valid headers, the next thing we will see is EOF.
2269 We must test for this specially, as further down the reading of the data is
2270 skipped if already at EOF. */
2272 if (smtp_input && (receive_feof)())
2274 smtp_reply = handle_lost_connection(US" (after header)");
2276 goto TIDYUP; /* Skip to end of function */
2279 /* If this is a filter test run and no headers were read, output a warning
2280 in case there is a mistake in the test message. */
2282 if (filter_test != FTEST_NONE && header_list->next == NULL)
2283 printf("Warning: no message headers read\n");
2286 /* Scan the headers to identify them. Some are merely marked for later
2287 processing; some are dealt with here. */
2289 for (header_line * h = header_list->next; h; h = h->next)
2291 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2292 if (is_resent) contains_resent_headers = TRUE;
2294 switch (header_checkname(h, is_resent))
2297 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2301 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2304 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2307 if (!resents_exist || is_resent) date_header_exists = TRUE;
2310 /* Same comments as about Return-Path: below. */
2312 case htype_delivery_date:
2313 if (delivery_date_remove) h->type = htype_old;
2316 /* Same comments as about Return-Path: below. */
2318 case htype_envelope_to:
2319 if (envelope_to_remove) h->type = htype_old;
2322 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2323 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2324 header consists of just the login id of the user who called Exim, rewrite
2325 it with the gecos field first. Apply this rule to Resent-From: if there
2326 are resent- fields. */
2329 h->type = htype_from;
2330 if (!resents_exist || is_resent)
2336 uschar *s = Ustrchr(h->text, ':') + 1;
2337 while (isspace(*s)) s++;
2338 len = h->slen - (s - h->text) - 1;
2339 if (Ustrlen(originator_login) == len &&
2340 strncmpic(s, originator_login, len) == 0)
2342 uschar *name = is_resent? US"Resent-From" : US"From";
2343 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2344 originator_login, qualify_domain_sender);
2345 from_header = header_last;
2346 h->type = htype_old;
2347 DEBUG(D_receive|D_rewrite)
2348 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2354 /* Identify the Message-id: header for generating "in-reply-to" in the
2355 autoreply transport. For incoming logging, save any resent- value. In both
2356 cases, take just the first of any multiples. */
2359 if (!msgid_header && (!resents_exist || is_resent))
2366 /* Flag all Received: headers */
2368 case htype_received:
2369 h->type = htype_received;
2373 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2375 case htype_reply_to:
2376 h->type = htype_reply_to;
2379 /* The Return-path: header is supposed to be added to messages when
2380 they leave the SMTP system. We shouldn't receive messages that already
2381 contain Return-path. However, since Exim generates Return-path: on
2382 local delivery, resent messages may well contain it. We therefore
2383 provide an option (which defaults on) to remove any Return-path: headers
2384 on input. Removal actually means flagging as "old", which prevents the
2385 header being transmitted with the message. */
2387 case htype_return_path:
2388 if (return_path_remove) h->type = htype_old;
2390 /* If we are testing a mail filter file, use the value of the
2391 Return-Path: header to set up the return_path variable, which is not
2392 otherwise set. However, remove any <> that surround the address
2393 because the variable doesn't have these. */
2395 if (filter_test != FTEST_NONE)
2397 uschar *start = h->text + 12;
2398 uschar *end = start + Ustrlen(start);
2399 while (isspace(*start)) start++;
2400 while (end > start && isspace(end[-1])) end--;
2401 if (*start == '<' && end[-1] == '>')
2406 return_path = string_copyn(start, end - start);
2407 printf("Return-path taken from \"Return-path:\" header line\n");
2411 /* If there is a "Sender:" header and the message is locally originated,
2412 and from an untrusted caller and suppress_local_fixups is not set, or if we
2413 are in submission mode for a remote message, mark it "old" so that it will
2414 not be transmitted with the message, unless active_local_sender_retain is
2415 set. (This can only be true if active_local_from_check is false.) If there
2416 are any resent- headers in the message, apply this rule to Resent-Sender:
2417 instead of Sender:. Messages with multiple resent- header sets cannot be
2418 tidily handled. (For this reason, at least one MUA - Pine - turns old
2419 resent- headers into X-resent- headers when resending, leaving just one
2423 h->type = !f.active_local_sender_retain
2424 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2425 || f.submission_mode
2427 && (!resents_exist || is_resent)
2428 ? htype_old : htype_sender;
2431 /* Remember the Subject: header for logging. There is no Resent-Subject */
2437 /* "To:" gets flagged, and the existence of a recipient header is noted,
2438 whether it's resent- or not. */
2443 to_or_cc_header_exists = TRUE;
2449 /* Extract recipients from the headers if that is required (the -t option).
2450 Note that this is documented as being done *before* any address rewriting takes
2451 place. There are two possibilities:
2453 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2454 recipients already listed are to be REMOVED from the message. Smail 3 works
2455 like this. We need to build a non-recipients tree for that list, because in
2456 subsequent processing this data is held in a tree and that's what the
2457 spool_write_header() function expects. Make sure that non-recipient addresses
2458 are fully qualified and rewritten if necessary.
2460 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2461 those in the command line arguments (and it is rumoured some other MTAs do
2462 this). Therefore, there is an option to make Exim behave this way.
2464 *** Notes on "Resent-" header lines ***
2466 The presence of resent-headers in the message makes -t horribly ambiguous.
2467 Experiments with sendmail showed that it uses recipients for all resent-
2468 headers, totally ignoring the concept of "sets of resent- headers" as described
2469 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2470 with all the addresses in one instance of each header.
2472 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2473 error for -t if there were resent- headers in the message. However, after a
2474 discussion on the mailing list, I've learned that there are MUAs that use
2475 resent- headers with -t, and also that the stuff about sets of resent- headers
2476 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2477 message with -t and resent- header lines makes sure that only *its* resent-
2478 headers are present; previous ones are often renamed as X-resent- for example.
2480 Consequently, Exim has been changed so that, if any resent- header lines are
2481 present, the recipients are taken from all of the appropriate resent- lines,
2482 and not from the ordinary To:, Cc:, etc. */
2487 error_block **bnext = &bad_addresses;
2489 if (extract_addresses_remove_arguments)
2491 while (recipients_count-- > 0)
2493 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2494 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2495 tree_add_nonrecipient(s);
2497 recipients_list = NULL;
2498 recipients_count = recipients_list_max = 0;
2501 /* Now scan the headers */
2503 for (header_line * h = header_list->next; h; h = h->next)
2505 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2506 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2508 uschar *s = Ustrchr(h->text, ':') + 1;
2509 while (isspace(*s)) s++;
2511 f.parse_allow_group = TRUE; /* Allow address group syntax */
2515 uschar *ss = parse_find_address_end(s, FALSE);
2516 uschar *recipient, *errmess, *pp;
2517 int start, end, domain;
2519 /* Check on maximum */
2521 if (recipients_max > 0 && ++rcount > recipients_max)
2522 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2523 US"message rejected: ", error_rc, stdin, NULL);
2524 /* Does not return */
2526 /* Make a copy of the address, and remove any internal newlines. These
2527 may be present as a result of continuations of the header line. The
2528 white space that follows the newline must not be removed - it is part
2531 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2532 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2537 BOOL b = allow_utf8_domains;
2538 allow_utf8_domains = TRUE;
2540 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2544 if (string_is_utf8(recipient))
2545 message_smtputf8 = TRUE;
2547 allow_utf8_domains = b;
2551 /* Keep a list of all the bad addresses so we can send a single
2552 error message at the end. However, an empty address is not an error;
2553 just ignore it. This can come from an empty group list like
2555 To: Recipients of list:;
2557 If there are no recipients at all, an error will occur later. */
2559 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2561 int len = Ustrlen(s);
2562 error_block *b = store_get(sizeof(error_block), FALSE);
2563 while (len > 0 && isspace(s[len-1])) len--;
2565 b->text1 = string_printing(string_copyn(s, len));
2571 /* If the recipient is already in the nonrecipients tree, it must
2572 have appeared on the command line with the option extract_addresses_
2573 remove_arguments set. Do not add it to the recipients, and keep a note
2574 that this has happened, in order to give a better error if there are
2575 no recipients left. */
2577 else if (recipient != NULL)
2579 if (tree_search(tree_nonrecipients, recipient) == NULL)
2580 receive_add_recipient(recipient, -1);
2582 extracted_ignored = TRUE;
2585 /* Move on past this address */
2587 s = ss + (*ss? 1:0);
2588 while (isspace(*s)) s++;
2589 } /* Next address */
2591 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2592 f.parse_found_group = FALSE;
2594 /* If this was the bcc: header, mark it "old", which means it
2595 will be kept on the spool, but not transmitted as part of the
2598 if (h->type == htype_bcc) h->type = htype_old;
2599 } /* For appropriate header line */
2600 } /* For each header line */
2604 /* Now build the unique message id. This has changed several times over the
2605 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2606 Retaining all the history in the comment has become too unwieldy - read
2607 previous release sources if you want it.
2609 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2610 The first part is the current time, in seconds. The second part is the current
2611 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2612 can hold a number in the range 0-3843. It used to be a computed sequence
2613 number, but is now the fractional component of the current time in units of
2614 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2615 received, Exim ensures that the timer has ticked at the appropriate level
2616 before proceeding, to avoid duplication if the pid happened to be re-used
2617 within the same time period. It seems likely that most messages will take at
2618 least half a millisecond to be received, so no delay will normally be
2619 necessary. At least for some time...
2621 There is a modification when localhost_number is set. Formerly this was allowed
2622 to be as large as 255. Now it is restricted to the range 0-16, and the final
2623 component of the message id becomes (localhost_number * 200) + fractional time
2624 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2626 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2627 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2628 still allows the tttttt field to hold a large enough number to last for some
2629 more decades, and the final two-digit field can hold numbers up to 1295, which
2630 is enough for milliseconds (instead of 1/2000 of a second).
2632 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2633 pid, so it is probably safe because pids have to be positive. The
2634 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2635 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2637 Note that string_base62() returns its data in a static storage block, so it
2638 must be copied before calling string_base62() again. It always returns exactly
2641 There doesn't seem to be anything in the RFC which requires a message id to
2642 start with a letter, but Smail was changed to ensure this. The external form of
2643 the message id (as supplied by string expansion) therefore starts with an
2644 additional leading 'E'. The spool file names do not include this leading
2645 letter and it is not used internally.
2647 NOTE: If ever the format of message ids is changed, the regular expression for
2648 checking that a string is in this format must be updated in a corresponding
2649 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2650 must also be changed to reflect the correct string length. The queue-sort code
2651 needs to know the layout. Then, of course, other programs that rely on the
2652 message id format will need updating too. */
2654 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2655 message_id[6] = '-';
2656 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2658 /* Deal with the case where the host number is set. The value of the number was
2659 checked when it was read, to ensure it isn't too big. The timing granularity is
2660 left in id_resolution so that an appropriate wait can be done after receiving
2661 the message, if necessary (we hope it won't be). */
2663 if (host_number_string)
2665 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2666 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2667 string_base62((long int)(
2668 host_number * (1000000/id_resolution) +
2669 message_id_tv.tv_usec/id_resolution)) + 4);
2672 /* Host number not set: final field is just the fractional time at an
2673 appropriate resolution. */
2677 id_resolution = BASE_62 == 62 ? 500 : 1000;
2678 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2679 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2682 /* Add the current message id onto the current process info string if
2685 (void)string_format(process_info + process_info_len,
2686 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2688 /* If we are using multiple input directories, set up the one for this message
2689 to be the least significant base-62 digit of the time of arrival. Otherwise
2690 ensure that it is an empty string. */
2692 set_subdir_str(message_subdir, message_id, 0);
2694 /* Now that we have the message-id, if there is no message-id: header, generate
2695 one, but only for local (without suppress_local_fixups) or submission mode
2696 messages. This can be user-configured if required, but we had better flatten
2697 any illegal characters therein. */
2700 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2702 uschar *id_text = US"";
2703 uschar *id_domain = primary_hostname;
2706 /* Permit only letters, digits, dots, and hyphens in the domain */
2708 if (message_id_domain)
2710 uschar *new_id_domain = expand_string(message_id_domain);
2713 if (!f.expand_string_forcedfail)
2714 log_write(0, LOG_MAIN|LOG_PANIC,
2715 "expansion of \"%s\" (message_id_header_domain) "
2716 "failed: %s", message_id_domain, expand_string_message);
2718 else if (*new_id_domain)
2720 id_domain = new_id_domain;
2721 for (uschar * p = id_domain; *p; p++)
2722 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2726 /* Permit all characters except controls and RFC 2822 specials in the
2727 additional text part. */
2729 if (message_id_text)
2731 uschar *new_id_text = expand_string(message_id_text);
2734 if (!f.expand_string_forcedfail)
2735 log_write(0, LOG_MAIN|LOG_PANIC,
2736 "expansion of \"%s\" (message_id_header_text) "
2737 "failed: %s", message_id_text, expand_string_message);
2739 else if (*new_id_text)
2741 id_text = new_id_text;
2742 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2746 /* Add the header line.
2747 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2748 appended, to preserve classical expectations of header ordering. */
2750 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2751 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2752 *id_text == 0 ? "" : ".", id_text, id_domain);
2754 /* Arrange for newly-created Message-Id to be logged */
2758 msgid_header_newly_created = TRUE;
2763 /* If we are to log recipients, keep a copy of the raw ones before any possible
2764 rewriting. Must copy the count, because later ACLs and the local_scan()
2765 function may mess with the real recipients. */
2767 if (LOGGING(received_recipients))
2769 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2770 for (int i = 0; i < recipients_count; i++)
2771 raw_recipients[i] = string_copy(recipients_list[i].address);
2772 raw_recipients_count = recipients_count;
2775 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2776 recipients will get here only if the conditions were right (allow_unqualified_
2777 recipient is TRUE). */
2779 for (int i = 0; i < recipients_count; i++)
2780 recipients_list[i].address =
2781 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2782 global_rewrite_rules, rewrite_existflags);
2784 /* If there is no From: header, generate one for local (without
2785 suppress_local_fixups) or submission_mode messages. If there is no sender
2786 address, but the sender is local or this is a local delivery error, use the
2787 originator login. This shouldn't happen for genuine bounces, but might happen
2788 for autoreplies. The addition of From: must be done *before* checking for the
2789 possible addition of a Sender: header, because untrusted_set_sender allows an
2790 untrusted user to set anything in the envelope (which might then get info
2791 From:) but we still want to ensure a valid Sender: if it is required. */
2794 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2796 uschar *oname = US"";
2798 /* Use the originator_name if this is a locally submitted message and the
2799 caller is not trusted. For trusted callers, use it only if -F was used to
2800 force its value or if we have a non-SMTP message for which -f was not used
2801 to set the sender. */
2803 if (!sender_host_address)
2805 if (!f.trusted_caller || f.sender_name_forced ||
2806 (!smtp_input && !f.sender_address_forced))
2807 oname = originator_name;
2810 /* For non-locally submitted messages, the only time we use the originator
2811 name is when it was forced by the /name= option on control=submission. */
2813 else if (submission_name) oname = submission_name;
2815 /* Envelope sender is empty */
2817 if (!*sender_address)
2819 uschar *fromstart, *fromend;
2821 fromstart = string_sprintf("%sFrom: %s%s",
2822 resent_prefix, oname, *oname ? " <" : "");
2823 fromend = *oname ? US">" : US"";
2825 if (f.sender_local || f.local_error_message)
2826 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2827 local_part_quote(originator_login), qualify_domain_sender,
2830 else if (f.submission_mode && authenticated_id)
2832 if (!submission_domain)
2833 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2834 local_part_quote(authenticated_id), qualify_domain_sender,
2837 else if (!*submission_domain) /* empty => whole address set */
2838 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2842 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2843 local_part_quote(authenticated_id), submission_domain, fromend);
2845 from_header = header_last; /* To get it checked for Sender: */
2849 /* There is a non-null envelope sender. Build the header using the original
2850 sender address, before any rewriting that might have been done while
2855 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2858 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2861 from_header = header_last; /* To get it checked for Sender: */
2866 /* If the sender is local (without suppress_local_fixups), or if we are in
2867 submission mode and there is an authenticated_id, check that an existing From:
2868 is correct, and if not, generate a Sender: header, unless disabled. Any
2869 previously-existing Sender: header was removed above. Note that sender_local,
2870 as well as being TRUE if the caller of exim is not trusted, is also true if a
2871 trusted caller did not supply a -f argument for non-smtp input. To allow
2872 trusted callers to forge From: without supplying -f, we have to test explicitly
2873 here. If the From: header contains more than one address, then the call to
2874 parse_extract_address fails, and a Sender: header is inserted, as required. */
2877 && ( f.active_local_from_check
2878 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2879 || f.submission_mode && authenticated_id
2882 BOOL make_sender = TRUE;
2883 int start, end, domain;
2885 uschar *from_address =
2886 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2887 &start, &end, &domain, FALSE);
2888 uschar *generated_sender_address;
2890 generated_sender_address = f.submission_mode
2891 ? !submission_domain
2892 ? string_sprintf("%s@%s",
2893 local_part_quote(authenticated_id), qualify_domain_sender)
2894 : !*submission_domain /* empty => full address */
2895 ? string_sprintf("%s", authenticated_id)
2896 : string_sprintf("%s@%s",
2897 local_part_quote(authenticated_id), submission_domain)
2898 : string_sprintf("%s@%s",
2899 local_part_quote(originator_login), qualify_domain_sender);
2901 /* Remove permitted prefixes and suffixes from the local part of the From:
2902 address before doing the comparison with the generated sender. */
2907 uschar *at = domain ? from_address + domain - 1 : NULL;
2910 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2911 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2913 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2914 from_address += slen;
2918 if ( strcmpic(generated_sender_address, from_address) == 0
2919 || (!domain && strcmpic(from_address, originator_login) == 0))
2920 make_sender = FALSE;
2923 /* We have to cause the Sender header to be rewritten if there are
2924 appropriate rewriting rules. */
2927 if (f.submission_mode && !submission_name)
2928 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2929 generated_sender_address);
2931 header_add(htype_sender, "%sSender: %s <%s>\n",
2933 f.submission_mode ? submission_name : originator_name,
2934 generated_sender_address);
2936 /* Ensure that a non-null envelope sender address corresponds to the
2937 submission mode sender address. */
2939 if (f.submission_mode && *sender_address)
2941 if (!sender_address_unrewritten)
2942 sender_address_unrewritten = sender_address;
2943 sender_address = generated_sender_address;
2944 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2945 log_write(L_address_rewrite, LOG_MAIN,
2946 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2947 sender_address_unrewritten, generated_sender_address);
2951 /* If there are any rewriting rules, apply them to the sender address, unless
2952 it has already been rewritten as part of verification for SMTP input. */
2954 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2956 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2957 global_rewrite_rules, rewrite_existflags);
2958 DEBUG(D_receive|D_rewrite)
2959 debug_printf("rewritten sender = %s\n", sender_address);
2963 /* The headers must be run through rewrite_header(), because it ensures that
2964 addresses are fully qualified, as well as applying any rewriting rules that may
2967 Qualification of header addresses in a message from a remote host happens only
2968 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2969 appropriate. For local messages, qualification always happens, unless -bnq is
2970 used to explicitly suppress it. No rewriting is done for an unqualified address
2971 that is left untouched.
2973 We start at the second header, skipping our own Received:. This rewriting is
2974 documented as happening *after* recipient addresses are taken from the headers
2975 by the -t command line option. An added Sender: gets rewritten here. */
2977 for (header_line * h = header_list->next; h; h = h->next)
2979 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2980 rewrite_existflags, TRUE);
2985 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2986 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2987 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2988 exists, this applies to the set of resent- headers rather than the normal set.
2990 The requirement for a recipient header has been removed in RFC 2822. At this
2991 point in the code, earlier versions of Exim added a To: header for locally
2992 submitted messages, and an empty Bcc: header for others. In the light of the
2993 changes in RFC 2822, this was dropped in November 2003. */
2996 /* If there is no date header, generate one if the message originates locally
2997 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2998 submission mode flag is set. Messages without Date: are not valid, but it seems
2999 to be more confusing if Exim adds one to all remotely-originated messages.
3000 As per Message-Id, we prepend if resending, else append.
3003 if ( !date_header_exists
3004 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3005 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3006 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3008 search_tidyup(); /* Free any cached resources */
3010 /* Show the complete set of headers if debugging. Note that the first one (the
3011 new Received:) has not yet been set. */
3015 debug_printf(">>Headers after rewriting and local additions:\n");
3016 for (header_line * h = header_list->next; h; h = h->next)
3017 debug_printf("%c %s", h->type, h->text);
3021 /* The headers are now complete in store. If we are running in filter
3022 testing mode, that is all this function does. Return TRUE if the message
3023 ended with a dot. */
3025 if (filter_test != FTEST_NONE)
3027 process_info[process_info_len] = 0;
3028 return message_ended == END_DOT;
3031 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3032 think more if it could be handled. Cannot do onward CHUNKING unless
3033 inbound is, but inbound chunking ought to be ok with outbound plain.
3034 Could we do onward CHUNKING given inbound CHUNKING?
3036 if (chunking_state > CHUNKING_OFFERED)
3037 cancel_cutthrough_connection(FALSE, US"chunking active");
3039 /* Cutthrough delivery:
3040 We have to create the Received header now rather than at the end of reception,
3041 so the timestamp behaviour is a change to the normal case.
3042 Having created it, send the headers to the destination. */
3044 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3046 if (received_count > received_headers_max)
3048 cancel_cutthrough_connection(TRUE, US"too many headers");
3049 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3050 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3051 "Too many \"Received\" headers",
3053 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3054 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3055 message_id[0] = 0; /* Indicate no message accepted */
3056 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3057 goto TIDYUP; /* Skip to end of function */
3059 received_header_gen();
3060 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3061 (void) cutthrough_headers_send();
3065 /* Open a new spool file for the data portion of the message. We need
3066 to access it both via a file descriptor and a stream. Try to make the
3067 directory if it isn't there. */
3069 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3070 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3072 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3074 if (errno == ENOENT)
3076 (void) directory_make(spool_directory,
3077 spool_sname(US"input", message_subdir),
3078 INPUT_DIRECTORY_MODE, TRUE);
3079 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3082 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3083 spool_name, strerror(errno));
3086 /* Make sure the file's group is the Exim gid, and double-check the mode
3087 because the group setting doesn't always get set automatically. */
3089 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3090 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3091 "Failed setting ownership on spool file %s: %s",
3092 spool_name, strerror(errno));
3093 (void)fchmod(data_fd, SPOOL_MODE);
3095 /* We now have data file open. Build a stream for it and lock it. We lock only
3096 the first line of the file (containing the message ID) because otherwise there
3097 are problems when Exim is run under Cygwin (I'm told). See comments in
3098 spool_in.c, where the same locking is done. */
3100 spool_data_file = fdopen(data_fd, "w+");
3101 lock_data.l_type = F_WRLCK;
3102 lock_data.l_whence = SEEK_SET;
3103 lock_data.l_start = 0;
3104 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3106 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3107 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3108 errno, strerror(errno));
3110 /* We have an open, locked data file. Write the message id to it to make it
3111 self-identifying. Then read the remainder of the input of this message and
3112 write it to the data file. If the variable next != NULL, it contains the first
3113 data line (which was read as a header but then turned out not to have the right
3114 format); write it (remembering that it might contain binary zeros). The result
3115 of fwrite() isn't inspected; instead we call ferror() below. */
3117 fprintf(spool_data_file, "%s-D\n", message_id);
3120 uschar *s = next->text;
3121 int len = next->slen;
3122 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3123 body_linecount++; /* Assumes only 1 line */
3126 /* Note that we might already be at end of file, or the logical end of file
3127 (indicated by '.'), or might have encountered an error while writing the
3128 message id or "next" line. */
3130 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3134 message_ended = chunking_state <= CHUNKING_OFFERED
3135 ? read_message_data_smtp(spool_data_file)
3137 ? read_message_bdat_smtp_wire(spool_data_file)
3138 : read_message_bdat_smtp(spool_data_file);
3139 receive_linecount++; /* The terminating "." line */
3142 message_ended = read_message_data(spool_data_file);
3144 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3145 message_linecount += body_linecount;
3147 switch (message_ended)
3149 /* Handle premature termination of SMTP */
3154 Uunlink(spool_name); /* Lose data file when closed */
3155 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3156 message_id[0] = 0; /* Indicate no message accepted */
3157 smtp_reply = handle_lost_connection(US"");
3159 goto TIDYUP; /* Skip to end of function */
3163 /* Handle message that is too big. Don't use host_or_ident() in the log
3164 message; we want to see the ident value even for non-remote messages. */
3167 Uunlink(spool_name); /* Lose the data file when closed */
3168 cancel_cutthrough_connection(TRUE, US"mail too big");
3169 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3171 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3172 "message too big: read=%d max=%d",
3174 sender_fullhost ? " H=" : "",
3175 sender_fullhost ? sender_fullhost : US"",
3176 sender_ident ? " U=" : "",
3177 sender_ident ? sender_ident : US"",
3179 thismessage_size_limit);
3183 smtp_reply = US"552 Message size exceeds maximum permitted";
3184 message_id[0] = 0; /* Indicate no message accepted */
3185 goto TIDYUP; /* Skip to end of function */
3189 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3190 give_local_error(ERRMESS_TOOBIG,
3191 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3192 US"message rejected: ", error_rc, spool_data_file, header_list);
3193 /* Does not return */
3197 /* Handle bad BDAT protocol sequence */
3200 Uunlink(spool_name); /* Lose the data file when closed */
3201 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3202 smtp_reply = US""; /* Response already sent */
3203 message_id[0] = 0; /* Indicate no message accepted */
3204 goto TIDYUP; /* Skip to end of function */
3208 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3209 example, there may be some expansion in an ACL that uses a timer.) */
3211 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3213 /* The message body has now been read into the data file. Call fflush() to
3214 empty the buffers in C, and then call fsync() to get the data written out onto
3215 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3216 having to do this). If there was an I/O error on either input or output,
3217 attempt to send an error message, and unlink the spool file. For non-SMTP input
3218 we can then give up. Note that for SMTP input we must swallow the remainder of
3219 the input in cases of output errors, since the far end doesn't expect to see
3220 anything until the terminating dot line is sent. */
3222 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3223 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3225 uschar *msg_errno = US strerror(errno);
3226 BOOL input_error = (receive_ferror)() != 0;
3227 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3228 input_error? "Input read" : "Spool write",
3230 sender_fullhost ? sender_fullhost : sender_ident);
3232 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3233 Uunlink(spool_name); /* Lose the data file */
3234 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3239 smtp_reply = US"451 Error while reading input data";
3242 smtp_reply = US"451 Error while writing spool file";
3243 receive_swallow_smtp();
3245 message_id[0] = 0; /* Indicate no message accepted */
3246 goto TIDYUP; /* Skip to end of function */
3251 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3252 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3254 /* Does not return */
3259 /* No I/O errors were encountered while writing the data file. */
3261 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3262 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3265 /* If there were any bad addresses extracted by -t, or there were no recipients
3266 left after -t, send a message to the sender of this message, or write it to
3267 stderr if the error handling option is set that way. Note that there may
3268 legitimately be no recipients for an SMTP message if they have all been removed
3271 We need to rewind the data file in order to read it. In the case of no
3272 recipients or stderr error writing, throw the data file away afterwards, and
3273 exit. (This can't be SMTP, which always ensures there's at least one
3274 syntactically good recipient address.) */
3276 if (extract_recip && (bad_addresses || recipients_count == 0))
3280 if (recipients_count == 0) debug_printf("*** No recipients\n");
3283 debug_printf("*** Bad address(es)\n");
3284 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3285 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3289 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3290 message_id, bad_addresses ? "bad addresses" : "no recipients");
3292 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3294 /* If configured to send errors to the sender, but this fails, force
3295 a failure error code. We use a special one for no recipients so that it
3296 can be detected by the autoreply transport. Otherwise error_rc is set to
3297 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3298 it is EXIT_SUCCESS. */
3300 if (error_handling == ERRORS_SENDER)
3302 if (!moan_to_sender(
3304 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3305 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3306 bad_addresses, header_list, spool_data_file, FALSE
3308 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3313 if (extracted_ignored)
3314 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3316 fprintf(stderr, "exim: no recipients in message\n");
3319 fprintf(stderr, "exim: invalid address%s",
3320 bad_addresses->next ? "es:\n" : ":");
3321 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3322 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3323 bad_addresses->text2);
3327 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3329 Uunlink(spool_name);
3330 (void)fclose(spool_data_file);
3331 exim_exit(error_rc, US"receiving");
3335 /* Data file successfully written. Generate text for the Received: header by
3336 expanding the configured string, and adding a timestamp. By leaving this
3337 operation till now, we ensure that the timestamp is the time that message
3338 reception was completed. However, this is deliberately done before calling the
3339 data ACL and local_scan().
3341 This Received: header may therefore be inspected by the data ACL and by code in
3342 the local_scan() function. When they have run, we update the timestamp to be
3343 the final time of reception.
3345 If there is just one recipient, set up its value in the $received_for variable
3346 for use when we generate the Received: header.
3348 Note: the checking for too many Received: headers is handled by the delivery
3350 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3352 if (!received_header->text) /* Non-cutthrough case */
3354 received_header_gen();
3356 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3358 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3359 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3361 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3362 now, before running the DATA ACL. */
3364 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3367 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3368 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3370 /* If an ACL is specified for checking things at this stage of reception of a
3371 message, run it, unless all the recipients were removed by "discard" in earlier
3372 ACLs. That is the only case in which recipients_count can be zero at this
3373 stage. Set deliver_datafile to point to the data file so that $message_body and
3374 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3377 deliver_datafile = data_fd;
3380 f.enable_dollar_recipients = TRUE;
3382 if (recipients_count == 0)
3383 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3387 /* Handle interactive SMTP messages */
3389 if (smtp_input && !smtp_batched_input)
3392 #ifndef DISABLE_DKIM
3393 if (!f.dkim_disable_verify)
3395 /* Finish verification */
3396 dkim_exim_verify_finish();
3398 /* Check if we must run the DKIM ACL */
3399 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3401 uschar * dkim_verify_signers_expanded =
3402 expand_string(dkim_verify_signers);
3403 gstring * results = NULL;
3407 gstring * seen_items = NULL;
3408 int old_pool = store_pool;
3410 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3412 if (!(ptr = dkim_verify_signers_expanded))
3413 log_write(0, LOG_MAIN|LOG_PANIC,
3414 "expansion of dkim_verify_signers option failed: %s",
3415 expand_string_message);
3417 /* Default to OK when no items are present */
3419 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3421 /* Prevent running ACL for an empty item */
3422 if (!item || !*item) continue;
3424 /* Only run ACL once for each domain or identity,
3425 no matter how often it appears in the expanded list. */
3429 const uschar * seen_items_list = string_from_gstring(seen_items);
3431 BOOL seen_this_item = FALSE;
3433 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3435 if (Ustrcmp(seen_item,item) == 0)
3437 seen_this_item = TRUE;
3444 debug_printf("acl_smtp_dkim: skipping signer %s, "
3445 "already seen\n", item);
3449 seen_items = string_catn(seen_items, US":", 1);
3451 seen_items = string_cat(seen_items, item);
3453 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3457 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3458 "skipping remaining items\n", rc, item);
3459 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3463 dkim_verify_status = string_from_gstring(results);
3464 store_pool = old_pool;
3465 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3468 recipients_count = 0;
3469 blackholed_by = US"DKIM ACL";
3471 blackhole_log_msg = string_sprintf(": %s", log_msg);
3475 Uunlink(spool_name);
3476 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3477 smtp_yield = FALSE; /* No more messages after dropped connection */
3478 smtp_reply = US""; /* Indicate reply already sent */
3479 message_id[0] = 0; /* Indicate no message accepted */
3480 goto TIDYUP; /* Skip to end of function */
3484 dkim_exim_verify_log_all();
3486 #endif /* DISABLE_DKIM */
3488 #ifdef WITH_CONTENT_SCAN
3489 if ( recipients_count > 0
3491 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3494 #endif /* WITH_CONTENT_SCAN */
3496 #ifdef SUPPORT_DMARC
3497 dmarc_store_data(from_header);
3500 #ifndef DISABLE_PRDR
3501 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3504 int all_fail = FAIL;
3506 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3507 /* Loop through recipients, responses must be in same order received */
3508 for (unsigned int c = 0; recipients_count > c; c++)
3510 uschar * addr= recipients_list[c].address;
3511 uschar * msg= US"PRDR R=<%s> %s";
3514 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3515 addr, c+1, recipients_count);
3516 rc = acl_check(ACL_WHERE_PRDR, addr,
3517 acl_smtp_data_prdr, &user_msg, &log_msg);
3519 /* If any recipient rejected content, indicate it in final message */
3521 /* If all recipients rejected, indicate in final message */
3526 case OK: case DISCARD: code = US"250"; break;
3527 case DEFER: code = US"450"; break;
3528 default: code = US"550"; break;
3530 if (user_msg != NULL)
3531 smtp_user_msg(code, user_msg);
3536 case OK: case DISCARD:
3537 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3539 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3541 msg = string_sprintf(CS msg, addr, "refusal"); break;
3543 smtp_user_msg(code, msg);
3545 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3546 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3547 else log_write(0, LOG_MAIN, "%s", CS msg);
3549 if (rc != OK) { receive_remove_recipient(addr); c--; }
3551 /* Set up final message, used if data acl gives OK */
3552 smtp_reply = string_sprintf("%s id=%s message %s",
3553 all_fail == FAIL ? US"550" : US"250",
3556 ? US"rejected for all recipients"
3559 : US"accepted for some recipients");
3560 if (recipients_count == 0)
3562 message_id[0] = 0; /* Indicate no message accepted */
3567 prdr_requested = FALSE;
3568 #endif /* !DISABLE_PRDR */
3570 /* Check the recipients count again, as the MIME ACL might have changed
3573 if (acl_smtp_data != NULL && recipients_count > 0)
3575 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3576 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3579 recipients_count = 0;
3580 blackholed_by = US"DATA ACL";
3582 blackhole_log_msg = string_sprintf(": %s", log_msg);
3583 cancel_cutthrough_connection(TRUE, US"data acl discard");
3587 Uunlink(spool_name);
3588 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3589 #ifdef WITH_CONTENT_SCAN
3592 #ifdef EXPERIMENTAL_DCC
3595 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3596 smtp_yield = FALSE; /* No more messages after dropped connection */
3597 smtp_reply = US""; /* Indicate reply already sent */
3598 message_id[0] = 0; /* Indicate no message accepted */
3599 goto TIDYUP; /* Skip to end of function */
3604 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3605 we cannot take different actions for permanent and temporary rejections. */
3610 #ifdef WITH_CONTENT_SCAN
3611 if ( acl_not_smtp_mime
3612 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3616 #endif /* WITH_CONTENT_SCAN */
3620 uschar *user_msg, *log_msg;
3621 f.authentication_local = TRUE;
3622 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3625 recipients_count = 0;
3626 blackholed_by = US"non-SMTP ACL";
3628 blackhole_log_msg = string_sprintf(": %s", log_msg);
3632 Uunlink(spool_name);
3633 #ifdef WITH_CONTENT_SCAN
3636 #ifdef EXPERIMENTAL_DCC
3639 /* The ACL can specify where rejections are to be logged, possibly
3640 nowhere. The default is main and reject logs. */
3642 if (log_reject_target)
3643 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3644 sender_address, log_msg);
3646 if (!user_msg) user_msg = US"local configuration problem";
3647 if (smtp_batched_input)
3648 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3649 /* Does not return */
3652 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3653 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3654 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3656 /* Does not return */
3659 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3663 /* The applicable ACLs have been run */
3665 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3666 if (f.queue_only_policy) queued_by = US"ACL";
3669 #ifdef WITH_CONTENT_SCAN
3673 #ifdef EXPERIMENTAL_DCC
3678 #ifdef HAVE_LOCAL_SCAN
3679 /* The final check on the message is to run the scan_local() function. The
3680 version supplied with Exim always accepts, but this is a hook for sysadmins to
3681 supply their own checking code. The local_scan() function is run even when all
3682 the recipients have been discarded. */
3684 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3686 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3687 deleted, and the incident gets logged. */
3689 if (sigsetjmp(local_scan_env, 1) == 0)
3691 had_local_scan_crash = 0;
3692 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3693 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3694 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3695 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3697 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3698 local_scan_timeout);
3699 local_scan_data = NULL;
3701 had_local_scan_timeout = 0;
3702 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3703 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3704 rc = local_scan(data_fd, &local_scan_data);
3706 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3708 f.enable_dollar_recipients = FALSE;
3710 store_pool = POOL_MAIN; /* In case changed */
3711 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3714 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3715 os_non_restarting_signal(SIGFPE, SIG_DFL);
3716 os_non_restarting_signal(SIGILL, SIG_DFL);
3717 os_non_restarting_signal(SIGBUS, SIG_DFL);
3721 if (had_local_scan_crash)
3723 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3724 "signal %d - message temporarily rejected (size %d)",
3725 had_local_scan_crash, message_size);
3726 receive_bomb_out(US"local-scan-error", US"local verification problem");
3727 /* Does not return */
3729 if (had_local_scan_timeout)
3731 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3732 "message temporarily rejected (size %d)", message_size);
3733 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3734 /* Does not return */
3738 /* The length check is paranoia against some runaway code, and also because
3739 (for a success return) lines in the spool file are read into big_buffer. */
3741 if (local_scan_data)
3743 int len = Ustrlen(local_scan_data);
3744 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3745 local_scan_data = string_copyn(local_scan_data, len);
3748 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3750 if (!f.deliver_freeze) /* ACL might have already frozen */
3752 f.deliver_freeze = TRUE;
3753 deliver_frozen_at = time(NULL);
3754 frozen_by = US"local_scan()";
3756 rc = LOCAL_SCAN_ACCEPT;
3758 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3760 if (!f.queue_only_policy) /* ACL might have already queued */
3762 f.queue_only_policy = TRUE;
3763 queued_by = US"local_scan()";
3765 rc = LOCAL_SCAN_ACCEPT;
3768 /* Message accepted: remove newlines in local_scan_data because otherwise
3769 the spool file gets corrupted. Ensure that all recipients are qualified. */
3771 if (rc == LOCAL_SCAN_ACCEPT)
3773 if (local_scan_data)
3774 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3775 for (int i = 0; i < recipients_count; i++)
3777 recipient_item *r = recipients_list + i;
3778 r->address = rewrite_address_qualify(r->address, TRUE);
3780 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3782 if (recipients_count == 0 && !blackholed_by)
3783 blackholed_by = US"local_scan";
3786 /* Message rejected: newlines permitted in local_scan_data to generate
3787 multiline SMTP responses. */
3791 uschar *istemp = US"";
3795 errmsg = local_scan_data;
3797 Uunlink(spool_name); /* Cancel this message */
3801 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3802 "rejection given", rc);
3805 case LOCAL_SCAN_REJECT_NOLOGHDR:
3806 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3809 case LOCAL_SCAN_REJECT:
3810 smtp_code = US"550";
3811 if (!errmsg) errmsg = US"Administrative prohibition";
3814 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3815 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3818 case LOCAL_SCAN_TEMPREJECT:
3820 smtp_code = US"451";
3821 if (!errmsg) errmsg = US"Temporary local problem";
3822 istemp = US"temporarily ";
3826 g = string_append(NULL, 2, US"F=",
3827 sender_address[0] == 0 ? US"<>" : sender_address);
3828 g = add_host_info_for_log(g);
3830 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3831 string_from_gstring(g), istemp, string_printing(errmsg));
3834 if (!smtp_batched_input)
3836 smtp_respond(smtp_code, 3, TRUE, errmsg);
3837 message_id[0] = 0; /* Indicate no message accepted */
3838 smtp_reply = US""; /* Indicate reply already sent */
3839 goto TIDYUP; /* Skip to end of function */
3842 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3843 /* Does not return */
3846 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3847 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3848 US"message rejected by local scan code: ", error_rc, spool_data_file,
3850 /* Does not return */
3854 /* Reset signal handlers to ignore signals that previously would have caused
3855 the message to be abandoned. */
3857 signal(SIGTERM, SIG_IGN);
3858 signal(SIGINT, SIG_IGN);
3859 #endif /* HAVE_LOCAL_SCAN */
3862 /* Ensure the first time flag is set in the newly-received message. */
3864 f.deliver_firsttime = TRUE;
3866 #ifdef EXPERIMENTAL_BRIGHTMAIL
3868 { /* rewind data file */
3869 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3870 bmi_verdicts = bmi_process_message(header_list, data_fd);
3874 /* Update the timestamp in our Received: header to account for any time taken by
3875 an ACL or by local_scan(). The new time is the time that all reception
3876 processing is complete. */
3878 timestamp = expand_string(US"${tod_full}");
3879 tslen = Ustrlen(timestamp);
3881 memcpy(received_header->text + received_header->slen - tslen - 1,
3884 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3888 f.deliver_freeze = FALSE;
3889 f.queue_only_policy = FALSE;
3892 /* Keep the data file open until we have written the header file, in order to
3893 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3894 don't write the header file, and we unlink the data file. If writing the header
3895 file fails, we have failed to accept this message. */
3897 if (host_checking || blackholed_by)
3899 Uunlink(spool_name);
3900 msg_size = 0; /* Compute size for log line */
3901 for (header_line * h = header_list; h; h = h->next)
3902 if (h->type != '*') msg_size += h->slen;
3905 /* Write the -H file */
3908 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3910 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3911 Uunlink(spool_name); /* Lose the data file */
3915 smtp_reply = US"451 Error in writing spool file";
3916 message_id[0] = 0; /* Indicate no message accepted */
3921 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3922 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3924 /* Does not return */
3929 /* The message has now been successfully received. */
3931 receive_messagecount++;
3933 /* Add data size to written header size. We do not count the initial file name
3934 that is in the file, but we do add one extra for the notional blank line that
3935 precedes the data. This total differs from message_size in that it include the
3936 added Received: header and any other headers that got created locally. */
3938 if (fflush(spool_data_file))
3940 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3941 log_write(0, LOG_MAIN, "%s\n", errmsg);
3942 Uunlink(spool_name); /* Lose the data file */
3946 smtp_reply = US"451 Error in writing spool file";
3947 message_id[0] = 0; /* Indicate no message accepted */
3952 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3953 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3955 /* Does not return */
3958 fstat(data_fd, &statbuf);
3960 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3962 /* Generate a "message received" log entry. We do this by building up a dynamic
3963 string as required. We log the arrival of a new message while the
3964 file is still locked, just in case the machine is *really* fast, and delivers
3965 it first! Include any message id that is in the message - since the syntax of a
3966 message id is actually an addr-spec, we can use the parse routine to canonicalize
3969 rcvd_log_reset_point = store_mark();
3970 g = string_get(256);
3972 g = string_append(g, 2,
3973 fake_response == FAIL ? US"(= " : US"<= ",
3974 sender_address[0] == 0 ? US"<>" : sender_address);
3975 if (message_reference)
3976 g = string_append(g, 2, US" R=", message_reference);
3978 g = add_host_info_for_log(g);
3981 if (LOGGING(tls_cipher) && tls_in.cipher)
3983 g = string_append(g, 2, US" X=", tls_in.cipher);
3984 # ifdef EXPERIMENTAL_TLS_RESUME
3985 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
3986 g = string_catn(g, US"*", 1);
3989 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3990 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3991 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3992 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3993 if (LOGGING(tls_sni) && tls_in.sni)
3994 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3997 if (sender_host_authenticated)
3999 g = string_append(g, 2, US" A=", sender_host_authenticated);
4000 if (authenticated_id)
4002 g = string_append(g, 2, US":", authenticated_id);
4003 if (LOGGING(smtp_mailauth) && authenticated_sender)
4004 g = string_append(g, 2, US":", authenticated_sender);
4008 #ifndef DISABLE_PRDR
4010 g = string_catn(g, US" PRDR", 5);
4013 #ifdef SUPPORT_PROXY
4014 if (proxy_session && LOGGING(proxy))
4015 g = string_append(g, 2, US" PRX=", proxy_local_address);
4018 if (chunking_state > CHUNKING_OFFERED)
4019 g = string_catn(g, US" K", 2);
4021 g = string_fmt_append(g, " S=%d", msg_size);
4023 /* log 8BITMIME mode announced in MAIL_FROM
4027 if (LOGGING(8bitmime))
4028 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4030 #ifndef DISABLE_DKIM
4031 if (LOGGING(dkim) && dkim_verify_overall)
4032 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4033 # ifdef EXPERIMENTAL_ARC
4034 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4035 g = string_catn(g, US" ARC", 4);
4039 if (LOGGING(receive_time))
4040 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
4043 g = string_append(g, 2, US" Q=", queue_name);
4045 /* If an addr-spec in a message-id contains a quoted string, it can contain
4046 any characters except " \ and CR and so in particular it can contain NL!
4047 Therefore, make sure we use a printing-characters only version for the log.
4048 Also, allow for domain literals in the message id. */
4050 if ( LOGGING(msg_id) && msgid_header
4051 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4055 BOOL save_allow_domain_literals = allow_domain_literals;
4056 allow_domain_literals = TRUE;
4057 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4058 &errmsg, &start, &end, &domain, FALSE);
4059 allow_domain_literals = save_allow_domain_literals;
4061 g = string_append(g, 2,
4062 msgid_header_newly_created ? US" id*=" : US" id=",
4063 string_printing(old_id));
4066 /* If subject logging is turned on, create suitable printing-character
4067 text. By expanding $h_subject: we make use of the MIME decoding. */
4069 if (LOGGING(subject) && subject_header)
4071 uschar *p = big_buffer;
4072 uschar *ss = expand_string(US"$h_subject:");
4074 /* Backslash-quote any double quotes or backslashes so as to make a
4075 a C-like string, and turn any non-printers into escape sequences. */
4078 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4080 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4085 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4088 /* Terminate the string: string_cat() and string_append() leave room, but do
4089 not put the zero in. */
4091 (void) string_from_gstring(g);
4093 /* Create a message log file if message logs are being used and this message is
4094 not blackholed. Write the reception stuff to it. We used to leave message log
4095 creation until the first delivery, but this has proved confusing for some
4098 if (message_logs && !blackholed_by)
4101 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4103 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4107 (void)directory_make(spool_directory,
4108 spool_sname(US"msglog", message_subdir),
4109 MSGLOG_DIRECTORY_MODE, TRUE);
4110 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4114 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4115 m_name, strerror(errno));
4118 FILE *message_log = fdopen(fd, "a");
4121 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4122 m_name, strerror(errno));
4127 uschar *now = tod_stamp(tod_log);
4128 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4129 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4131 if (f.queue_only_policy) fprintf(message_log,
4132 "%s no immediate delivery: queued%s%s by %s\n", now,
4133 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4135 (void)fclose(message_log);
4140 /* Everything has now been done for a successful message except logging its
4141 arrival, and outputting an SMTP response. While writing to the log, set a flag
4142 to cause a call to receive_bomb_out() if the log cannot be opened. */
4144 f.receive_call_bombout = TRUE;
4146 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4147 connection has gone away. This can only be done if there is no unconsumed input
4148 waiting in the local input buffer. We can test for this by calling
4149 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4150 input to be sent following the final dot, so the presence of following input is
4153 If the connection is still present, but there is no unread input for the
4154 socket, the result of a select() call will be zero. If, however, the connection
4155 has gone away, or if there is pending input, the result of select() will be
4156 non-zero. The two cases can be distinguished by trying to read the next input
4157 character. If we succeed, we can unread it so that it remains in the local
4158 buffer for handling later. If not, the connection has been lost.
4160 Of course, since TCP/IP is asynchronous, there is always a chance that the
4161 connection will vanish between the time of this test and the sending of the
4162 response, but the chance of this happening should be small. */
4164 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4165 !receive_smtp_buffered())
4168 fd_set select_check;
4169 FD_ZERO(&select_check);
4170 FD_SET(fileno(smtp_in), &select_check);
4174 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4176 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4177 if (c != EOF) (receive_ungetc)(c); else
4179 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4180 smtp_reply = US""; /* No attempt to send a response */
4181 smtp_yield = FALSE; /* Nothing more on this connection */
4183 /* Re-use the log line workspace */
4186 g = string_cat(g, US"SMTP connection lost after final dot");
4187 g = add_host_info_for_log(g);
4188 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4190 /* Delete the files for this aborted message. */
4192 Uunlink(spool_name);
4193 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4194 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4201 /* The connection has not gone away; we really are going to take responsibility
4202 for this message. */
4204 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4207 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4208 the sender's dot (below).
4209 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4210 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4211 in which case pass temp-reject back to initiator and dump the files.
4213 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4215 XXX We do not handle queue-only, freezing, or blackholes.
4217 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4219 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4220 /* Logging was done in finaldot() */
4223 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4224 cutthrough_done = ACCEPTED;
4225 break; /* message_id needed for SMTP accept below */
4227 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4228 ... for which, pass back the exact error */
4229 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4230 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4231 break; /* message_id needed for SMTP accept below */
4233 default: /* Unknown response, or error. Treat as temp-reject. */
4234 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4235 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4236 break; /* message_id needed for SMTP accept below */
4238 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4239 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4240 cutthrough_done = PERM_REJ;
4245 #ifndef DISABLE_PRDR
4246 if(!smtp_reply || prdr_requested)
4251 log_write(0, LOG_MAIN |
4252 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4253 (LOGGING(received_sender) ? LOG_SENDER : 0),
4256 /* Log any control actions taken by an ACL or local_scan(). */
4258 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4259 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4260 "no immediate delivery: queued%s%s by %s",
4261 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4264 f.receive_call_bombout = FALSE;
4266 /* The store for the main log message can be reused */
4267 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4269 /* If the message is frozen, and freeze_tell is set, do the telling. */
4271 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4272 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4273 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4274 message_id, frozen_by, sender_address);
4277 /* Either a message has been successfully received and written to the two spool
4278 files, or an error in writing the spool has occurred for an SMTP message, or
4279 an SMTP message has been rejected for policy reasons, or a message was passed on
4280 by cutthrough delivery. (For a non-SMTP message we will have already given up
4281 because there's no point in carrying on!) For non-cutthrough we must now close
4282 (and thereby unlock) the data file. In the successful case, this leaves the
4283 message on the spool, ready for delivery. In the error case, the spool file will
4284 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4287 For cutthrough we hold the data file locked until we have deleted it, otherwise
4288 a queue-runner could grab it in the window.
4290 A fflush() was done earlier in the expectation that any write errors on the
4291 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4292 possible for fclose() to fail - but what to do? What has happened to the lock
4293 if this happens? We can at least log it; if it is observed on some platform
4294 then we can think about properly declaring the message not-received. */
4298 /* In SMTP sessions we may receive several messages in one connection. After
4299 each one, we wait for the clock to tick at the level of message-id granularity.
4300 This is so that the combination of time+pid is unique, even on systems where the
4301 pid can be re-used within our time interval. We can't shorten the interval
4302 without re-designing the message-id. See comments above where the message id is
4303 created. This is Something For The Future.
4304 Do this wait any time we have created a message-id, even if we rejected the
4305 message. This gives unique IDs for logging done by ACLs. */
4307 if (id_resolution != 0)
4309 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
4310 exim_wait_tick(&message_id_tv, id_resolution);
4315 process_info[process_info_len] = 0; /* Remove message id */
4316 if (spool_data_file && cutthrough_done == NOT_TRIED)
4318 if (fclose(spool_data_file)) /* Frees the lock */
4319 log_write(0, LOG_MAIN|LOG_PANIC,
4320 "spoolfile error on close: %s", strerror(errno));
4321 spool_data_file = NULL;
4324 /* Now reset signal handlers to their defaults */
4326 signal(SIGTERM, SIG_DFL);
4327 signal(SIGINT, SIG_DFL);
4329 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4330 value, which defaults TRUE - meaning there may be more incoming messages from
4331 this connection. For non-SMTP callers (where there is only ever one message),
4332 the default is FALSE. */
4338 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4339 is set to the response that should be sent. When it is NULL, we generate
4340 default responses. After an ACL error or local_scan() error, the response has
4341 already been sent, and smtp_reply is an empty string to indicate this. */
4343 if (!smtp_batched_input)
4347 if (fake_response != OK)
4348 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4349 3, TRUE, fake_response_text);
4351 /* An OK response is required; use "message" text if present. */
4355 uschar *code = US"250";
4357 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4358 smtp_respond(code, len, TRUE, user_msg);
4361 /* Default OK response */
4363 else if (chunking_state > CHUNKING_OFFERED)
4365 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4366 chunking_datasize, message_size+message_linecount, message_id);
4367 chunking_state = CHUNKING_OFFERED;
4370 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4374 "\n**** SMTP testing: that is not a real message id!\n\n");
4377 /* smtp_reply is set non-empty */
4379 else if (smtp_reply[0] != 0)
4380 if (fake_response != OK && smtp_reply[0] == '2')
4381 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4382 fake_response_text);
4384 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4386 switch (cutthrough_done)
4389 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4391 /* Delete spool files */
4392 Uunlink(spool_name);
4393 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4394 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4398 if (cutthrough.defer_pass)
4400 Uunlink(spool_name);
4401 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4402 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4407 if (cutthrough_done != NOT_TRIED)
4409 if (spool_data_file)
4411 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4412 spool_data_file = NULL;
4414 message_id[0] = 0; /* Prevent a delivery from starting */
4415 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4416 cutthrough.defer_pass = FALSE;
4420 /* For batched SMTP, generate an error message on failure, and do
4421 nothing on success. The function moan_smtp_batch() does not return -
4422 it exits from the program with a non-zero return code. */
4424 else if (smtp_reply)
4425 moan_smtp_batch(NULL, "%s", smtp_reply);
4429 /* If blackholing, we can immediately log this message's sad fate. The data
4430 file has already been unlinked, and the header file was never written to disk.
4431 We must now indicate that nothing was received, to prevent a delivery from
4436 const uschar *detail =
4437 #ifdef HAVE_LOCAL_SCAN
4438 local_scan_data ? string_printing(local_scan_data) :
4440 string_sprintf("(%s discarded recipients)", blackholed_by);
4441 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4442 log_write(0, LOG_MAIN, "Completed");
4446 /* Reset headers so that logging of rejects for a subsequent message doesn't
4447 include them. It is also important to set header_last = NULL before exiting
4448 from this function, as this prevents certain rewrites that might happen during
4449 subsequent verifying (of another incoming message) from trying to add headers
4450 when they shouldn't. */
4452 header_list = header_last = NULL;
4454 return yield; /* TRUE if more messages (SMTP only) */
4457 /* End of receive.c */