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 mime_part_count = -1;
1403 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1408 /* make sure the eml mbox file is spooled up */
1409 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1410 { /* error while spooling */
1411 log_write(0, LOG_MAIN|LOG_PANIC,
1412 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1413 Uunlink(spool_name);
1415 #ifdef EXPERIMENTAL_DCC
1418 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1419 message_id[0] = 0; /* Indicate no message accepted */
1420 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1421 return FALSE; /* Indicate skip to end of receive function */
1427 mime_part_count = -1;
1428 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1429 (void)fclose(mbox_file);
1431 if (rfc822_file_path)
1433 mime_part_count = mime_part_count_buffer;
1435 if (unlink(CS rfc822_file_path) == -1)
1437 log_write(0, LOG_PANIC,
1438 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1441 rfc822_file_path = NULL;
1444 /* check if we must check any message/rfc822 attachments */
1447 uschar * scandir = string_copyn(mbox_filename,
1448 Ustrrchr(mbox_filename, '/') - mbox_filename);
1449 struct dirent * entry;
1452 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1453 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1455 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1457 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1463 if (rfc822_file_path)
1465 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1467 /* set RFC822 expansion variable */
1469 mime_part_count_buffer = mime_part_count;
1470 goto MIME_ACL_CHECK;
1472 log_write(0, LOG_PANIC,
1473 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1474 unlink(CS rfc822_file_path);
1479 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1482 recipients_count = 0;
1483 *blackholed_by_ptr = US"MIME ACL";
1484 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1488 Uunlink(spool_name);
1489 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1491 #ifdef EXPERIMENTAL_DCC
1496 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1497 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1498 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1500 message_id[0] = 0; /* Indicate no message accepted */
1501 return FALSE; /* Cause skip to end of receive function */
1507 #endif /* WITH_CONTENT_SCAN */
1512 received_header_gen(void)
1516 header_line *received_header= header_list;
1518 timestamp = expand_string(US"${tod_full}");
1519 if (recipients_count == 1) received_for = recipients_list[0].address;
1520 received = expand_string(received_header_text);
1521 received_for = NULL;
1525 if(spool_name[0] != 0)
1526 Uunlink(spool_name); /* Lose the data file */
1527 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1528 "(received_header_text) failed: %s", string_printing(received_header_text),
1529 expand_string_message);
1532 /* The first element on the header chain is reserved for the Received header,
1533 so all we have to do is fill in the text pointer, and set the type. However, if
1534 the result of the expansion is an empty string, we leave the header marked as
1535 "old" so as to refrain from adding a Received header. */
1537 if (received[0] == 0)
1539 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1540 received_header->type = htype_old;
1544 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1545 received_header->type = htype_received;
1548 received_header->slen = Ustrlen(received_header->text);
1550 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1551 received_header->type, received_header->text);
1556 /*************************************************
1558 *************************************************/
1560 /* Receive a message on the given input, and put it into a pair of spool files.
1561 Either a non-null list of recipients, or the extract flag will be true, or
1562 both. The flag sender_local is true for locally generated messages. The flag
1563 submission_mode is true if an ACL has obeyed "control = submission". The flag
1564 suppress_local_fixups is true if an ACL has obeyed "control =
1565 suppress_local_fixups" or -G was passed on the command-line.
1566 The flag smtp_input is true if the message is to be
1567 handled using SMTP conventions about termination and lines starting with dots.
1568 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1570 If a message was successfully read, message_id[0] will be non-zero.
1572 The general actions of this function are:
1574 . Read the headers of the message (if any) into a chain of store
1577 . If there is a "sender:" header and the message is locally originated,
1578 throw it away, unless the caller is trusted, or unless
1579 active_local_sender_retain is set - which can only happen if
1580 active_local_from_check is false.
1582 . If recipients are to be extracted from the message, build the
1583 recipients list from the headers, removing any that were on the
1584 original recipients list (unless extract_addresses_remove_arguments is
1585 false), and at the same time, remove any bcc header that may be present.
1587 . Get the spool file for the data, sort out its unique name, open
1588 and lock it (but don't give it the name yet).
1590 . Generate a "Message-Id" header if the message doesn't have one, for
1591 locally-originated messages.
1593 . Generate a "Received" header.
1595 . Ensure the recipients list is fully qualified and rewritten if necessary.
1597 . If there are any rewriting rules, apply them to the sender address
1598 and also to the headers.
1600 . If there is no from: header, generate one, for locally-generated messages
1601 and messages in "submission mode" only.
1603 . If the sender is local, check that from: is correct, and if not, generate
1604 a Sender: header, unless message comes from a trusted caller, or this
1605 feature is disabled by active_local_from_check being false.
1607 . If there is no "date" header, generate one, for locally-originated
1608 or submission mode messages only.
1610 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1611 dot_ends mode, to the data file. Leave it open, to hold the lock.
1613 . Write the envelope and the headers to a new file.
1615 . Set the name for the header file; close it.
1617 . Set the name for the data file; close it.
1619 Because this function can potentially be called many times in a single
1620 SMTP connection, all store should be got by store_get(), so that it will be
1621 automatically retrieved after the message is accepted.
1623 FUDGE: It seems that sites on the net send out messages with just LF
1624 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1625 we make the CRs optional in all cases.
1627 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1628 new regime is now in place in which bare CRs in header lines are turned into LF
1629 followed by a space, so as not to terminate the header line.
1631 February 2004: A bare LF in a header line in a message whose first line was
1632 terminated by CRLF is treated in the same way as a bare CR.
1635 extract_recip TRUE if recipients are to be extracted from the message's
1638 Returns: TRUE there are more messages to be read (SMTP input)
1639 FALSE there are no more messages to be read (non-SMTP input
1640 or SMTP connection collapsed, or other failure)
1642 When reading a message for filter testing, the returned value indicates
1643 whether the headers (which is all that is read) were terminated by '.' or
1647 receive_msg(BOOL extract_recip)
1651 int process_info_len = Ustrlen(process_info);
1652 int error_rc = error_handling == ERRORS_SENDER
1653 ? errors_sender_rc : EXIT_FAILURE;
1654 int header_size = 256;
1655 int start, end, domain;
1656 int id_resolution = 0;
1658 int prevlines_length = 0;
1662 BOOL contains_resent_headers = FALSE;
1663 BOOL extracted_ignored = FALSE;
1664 BOOL first_line_ended_crlf = TRUE_UNSET;
1665 BOOL smtp_yield = TRUE;
1668 BOOL resents_exist = FALSE;
1669 uschar *resent_prefix = US"";
1670 uschar *blackholed_by = NULL;
1671 uschar *blackhole_log_msg = US"";
1672 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1675 error_block *bad_addresses = NULL;
1677 uschar *frozen_by = NULL;
1678 uschar *queued_by = NULL;
1681 rmark rcvd_log_reset_point;
1683 struct stat statbuf;
1685 /* Final message to give to SMTP caller, and messages from ACLs */
1687 uschar *smtp_reply = NULL;
1688 uschar *user_msg, *log_msg;
1690 /* Working header pointers */
1695 /* Flags for noting the existence of certain headers (only one left) */
1697 BOOL date_header_exists = FALSE;
1699 /* Pointers to receive the addresses of headers whose contents we need. */
1701 header_line *from_header = NULL;
1702 header_line *subject_header = NULL;
1703 header_line *msgid_header = NULL;
1704 header_line *received_header;
1705 BOOL msgid_header_newly_created = FALSE;
1707 /* Variables for use when building the Received: header. */
1713 /* Release any open files that might have been cached while preparing to
1714 accept the message - e.g. by verifying addresses - because reading a message
1715 might take a fair bit of real time. */
1719 /* Extracting the recipient list from an input file is incompatible with
1720 cutthrough delivery with the no-spool option. It shouldn't be possible
1721 to set up the combination, but just in case kill any ongoing connection. */
1722 if (extract_recip || !smtp_input)
1723 cancel_cutthrough_connection(TRUE, US"not smtp input");
1725 /* Initialize the chain of headers by setting up a place-holder for Received:
1726 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1727 pointing to the end of the chain to make adding headers simple. */
1729 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1730 header_list->next = NULL;
1731 header_list->type = htype_old;
1732 header_list->text = NULL;
1733 header_list->slen = 0;
1735 /* Control block for the next header to be read. */
1737 reset_point = store_mark();
1738 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1739 next->text = store_get(header_size, TRUE); /* tainted */
1741 /* Initialize message id to be null (indicating no message read), and the
1742 header names list to be the normal list. Indicate there is no data file open
1743 yet, initialize the size and warning count, and deal with no size limit. */
1746 spool_data_file = NULL;
1751 received_count = 1; /* For the one we will add */
1753 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1755 /* While reading the message, the following counts are computed. */
1757 message_linecount = body_linecount = body_zerocount =
1758 max_received_linelength = 0;
1760 #ifdef WITH_CONTENT_SCAN
1761 /* reset non-per-part mime variables */
1762 mime_is_coverletter = 0;
1764 mime_part_count = -1;
1767 #ifndef DISABLE_DKIM
1768 /* Call into DKIM to set up the context. In CHUNKING mode
1769 we clear the dot-stuffing flag */
1770 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1771 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1774 #ifdef SUPPORT_DMARC
1775 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1778 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1779 ids, and fractions of a second are required. See the comments that precede the
1780 message id creation below. */
1782 (void)gettimeofday(&message_id_tv, NULL);
1784 /* For other uses of the received time we can operate with granularity of one
1785 second, and for that we use the global variable received_time. This is for
1786 things like ultimate message timeouts. */
1788 received_time = message_id_tv;
1790 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1791 happen in the smtp_getc() function when it refills its buffer. */
1793 had_data_timeout = 0;
1795 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1797 /* If not SMTP input, timeout happens only if configured, and we just set a
1798 single timeout for the whole message. */
1800 else if (receive_timeout > 0)
1802 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1803 ALARM(receive_timeout);
1806 /* SIGTERM and SIGINT are caught always. */
1808 had_data_sigint = 0;
1809 signal(SIGTERM, data_sigterm_sigint_handler);
1810 signal(SIGINT, data_sigterm_sigint_handler);
1812 /* Header lines in messages are not supposed to be very long, though when
1813 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1814 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1815 storing the header, and extend this as necessary using string_cat().
1817 To cope with total lunacies, impose an upper limit on the length of the header
1818 section of the message, as otherwise the store will fill up. We must also cope
1819 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1820 Folded header lines are joined into one string, leaving the '\n' characters
1821 inside them, so that writing them out reproduces the input.
1823 Loop for each character of each header; the next structure for chaining the
1824 header is set up already, with ptr the offset of the next character in
1829 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1831 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1832 SMTP must have a correct "." terminator. */
1834 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1836 smtp_reply = handle_lost_connection(US" (header)");
1838 goto TIDYUP; /* Skip to end of function */
1841 /* See if we are at the current header's size limit - there must be at least
1842 four bytes left. This allows for the new character plus a zero, plus two for
1843 extra insertions when we are playing games with dots and carriage returns. If
1844 we are at the limit, extend the text buffer. This could have been done
1845 automatically using string_cat() but because this is a tightish loop storing
1846 only one character at a time, we choose to do it inline. Normally
1847 store_extend() will be able to extend the block; only at the end of a big
1848 store block will a copy be needed. To handle the case of very long headers
1849 (and sometimes lunatic messages can have ones that are 100s of K long) we
1850 call store_release() for strings that have been copied - if the string is at
1851 the start of a block (and therefore the only thing in it, because we aren't
1852 doing any other gets), the block gets freed. We can only do this release if
1853 there were no allocations since the once that we want to free. */
1855 if (ptr >= header_size - 4)
1857 int oldsize = header_size;
1859 if (header_size >= INT_MAX/2)
1863 /* The data came from the message, so is tainted. */
1865 if (!store_extend(next->text, TRUE, oldsize, header_size))
1866 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1869 /* Cope with receiving a binary zero. There is dispute about whether
1870 these should be allowed in RFC 822 messages. The middle view is that they
1871 should not be allowed in headers, at least. Exim takes this attitude at
1872 the moment. We can't just stomp on them here, because we don't know that
1873 this line is a header yet. Set a flag to cause scanning later. */
1875 if (ch == 0) had_zero++;
1877 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1878 those from data files use just LF. Treat LF in local SMTP input as a
1879 terminator too. Treat EOF as a line terminator always. */
1881 if (ch == EOF) goto EOL;
1883 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1884 other MTAs accept this. We are therefore forced into this "liberalisation"
1885 too, so we accept LF as a line terminator whatever the source of the message.
1886 However, if the first line of the message ended with a CRLF, we treat a bare
1887 LF specially by inserting a white space after it to ensure that the header
1888 line is not terminated. */
1892 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1893 else if (first_line_ended_crlf) receive_ungetc(' ');
1897 /* This is not the end of the line. If this is SMTP input and this is
1898 the first character in the line and it is a "." character, ignore it.
1899 This implements the dot-doubling rule, though header lines starting with
1900 dots aren't exactly common. They are legal in RFC 822, though. If the
1901 following is CRLF or LF, this is the line that that terminates the
1902 entire message. We set message_ended to indicate this has happened (to
1903 prevent further reading), and break out of the loop, having freed the
1904 empty header, and set next = NULL to indicate no data line. */
1906 if (ptr == 0 && ch == '.' && f.dot_ends)
1908 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1911 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1915 ch = '\r'; /* Revert to CR */
1920 message_ended = END_DOT;
1921 reset_point = store_reset(reset_point);
1923 break; /* End character-reading loop */
1926 /* For non-SMTP input, the dot at the start of the line was really a data
1927 character. What is now in ch is the following character. We guaranteed
1928 enough space for this above. */
1932 next->text[ptr++] = '.';
1937 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1938 remember this case if this is the first line ending. */
1942 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1945 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1949 /* Otherwise, put back the character after CR, and turn the bare CR
1952 ch = (receive_ungetc)(ch);
1953 next->text[ptr++] = '\n';
1958 /* We have a data character for the header line. */
1960 next->text[ptr++] = ch; /* Add to buffer */
1961 message_size++; /* Total message size so far */
1963 /* Handle failure due to a humungously long header section. The >= allows
1964 for the terminating \n. Add what we have so far onto the headers list so
1965 that it gets reflected in any error message, and back up the just-read
1968 if (message_size >= header_maxsize)
1971 next->text[ptr] = 0;
1973 next->type = htype_other;
1975 header_last->next = next;
1978 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1979 "%s (more than %d characters): message abandoned",
1980 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1984 smtp_reply = US"552 Message header is ridiculously long";
1985 receive_swallow_smtp();
1986 goto TIDYUP; /* Skip to end of function */
1991 give_local_error(ERRMESS_VLONGHEADER,
1992 string_sprintf("message header longer than %d characters received: "
1993 "message not accepted", header_maxsize), US"", error_rc, stdin,
1995 /* Does not return */
1999 continue; /* With next input character */
2001 /* End of header line reached */
2005 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2007 receive_linecount++;
2008 message_linecount++;
2010 /* Keep track of maximum line length */
2012 if (ptr - prevlines_length > max_received_linelength)
2013 max_received_linelength = ptr - prevlines_length;
2014 prevlines_length = ptr + 1;
2016 /* Now put in the terminating newline. There is always space for
2017 at least two more characters. */
2019 next->text[ptr++] = '\n';
2022 /* A blank line signals the end of the headers; release the unwanted
2023 space and set next to NULL to indicate this. */
2027 reset_point = store_reset(reset_point);
2032 /* There is data in the line; see if the next input character is a
2033 whitespace character. If it is, we have a continuation of this header line.
2034 There is always space for at least one character at this point. */
2038 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2039 if (nextch == ' ' || nextch == '\t')
2041 next->text[ptr++] = nextch;
2042 if (++message_size >= header_maxsize)
2044 continue; /* Iterate the loop */
2046 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2047 else ch = EOF; /* Cause main loop to exit at end */
2050 /* We have got to the real line end. Terminate the string and release store
2051 beyond it. If it turns out to be a real header, internal binary zeros will
2052 be squashed later. */
2054 next->text[ptr] = 0;
2056 store_release_above(next->text + ptr + 1);
2058 /* Check the running total size against the overall message size limit. We
2059 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2060 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2061 headers - the code to read the body will then also hit the buffer. */
2063 if (message_size > thismessage_size_limit) break;
2065 /* A line that is not syntactically correct for a header also marks
2066 the end of the headers. In this case, we leave next containing the
2067 first data line. This might actually be several lines because of the
2068 continuation logic applied above, but that doesn't matter.
2070 It turns out that smail, and presumably sendmail, accept leading lines
2073 From ph10 Fri Jan 5 12:35 GMT 1996
2075 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2076 find any documentation of this, but for compatibility it had better be
2077 accepted. Exim restricts it to the case of non-smtp messages, and
2078 treats it as an alternative to the -f command line option. Thus it is
2079 ignored except for trusted users or filter testing. Otherwise it is taken
2080 as the sender address, unless -f was used (sendmail compatibility).
2082 It further turns out that some UUCPs generate the From_line in a different
2085 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2087 The regex for matching these things is now capable of recognizing both
2088 formats (including 2- and 4-digit years in the latter). In fact, the regex
2089 is now configurable, as is the expansion string to fish out the sender.
2091 Even further on it has been discovered that some broken clients send
2092 these lines in SMTP messages. There is now an option to ignore them from
2093 specified hosts or networks. Sigh. */
2095 if ( header_last == header_list
2097 || ( sender_host_address
2098 && verify_check_host(&ignore_fromline_hosts) == OK
2100 || (!sender_host_address && ignore_fromline_local)
2102 && regex_match_and_setup(regex_From, next->text, 0, -1)
2105 if (!f.sender_address_forced)
2107 uschar *uucp_sender = expand_string(uucp_from_sender);
2109 log_write(0, LOG_MAIN|LOG_PANIC,
2110 "expansion of \"%s\" failed after matching "
2111 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2114 int start, end, domain;
2116 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2117 &start, &end, &domain, TRUE);
2120 if (domain == 0 && newsender[0] != 0)
2121 newsender = rewrite_address_qualify(newsender, FALSE);
2123 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2125 sender_address = newsender;
2127 if (f.trusted_caller || filter_test != FTEST_NONE)
2129 authenticated_sender = NULL;
2130 originator_name = US"";
2131 f.sender_local = FALSE;
2134 if (filter_test != FTEST_NONE)
2135 printf("Sender taken from \"From \" line\n");
2142 /* Not a leading "From " line. Check to see if it is a valid header line.
2143 Header names may contain any non-control characters except space and colon,
2148 uschar *p = next->text;
2150 /* If not a valid header line, break from the header reading loop, leaving
2151 next != NULL, indicating that it holds the first line of the body. */
2153 if (isspace(*p)) break;
2154 while (mac_isgraph(*p) && *p != ':') p++;
2155 while (isspace(*p)) p++;
2158 body_zerocount = had_zero;
2162 /* We have a valid header line. If there were any binary zeroes in
2163 the line, stomp on them here. */
2166 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2169 /* It is perfectly legal to have an empty continuation line
2170 at the end of a header, but it is confusing to humans
2171 looking at such messages, since it looks like a blank line.
2172 Reduce confusion by removing redundant white space at the
2173 end. We know that there is at least one printing character
2174 (the ':' tested for above) so there is no danger of running
2177 p = next->text + ptr - 2;
2180 while (*p == ' ' || *p == '\t') p--;
2181 if (*p != '\n') break;
2182 ptr = (p--) - next->text + 1;
2183 message_size -= next->slen - ptr;
2184 next->text[ptr] = 0;
2188 /* Add the header to the chain */
2190 next->type = htype_other;
2192 header_last->next = next;
2195 /* Check the limit for individual line lengths. This comes after adding to
2196 the chain so that the failing line is reflected if a bounce is generated
2197 (for a local message). */
2199 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2201 log_write(0, LOG_MAIN, "overlong message header line received from "
2202 "%s (more than %d characters): message abandoned",
2203 f.sender_host_unknown ? sender_ident : sender_fullhost,
2204 header_line_maxsize);
2208 smtp_reply = US"552 A message header line is too long";
2209 receive_swallow_smtp();
2210 goto TIDYUP; /* Skip to end of function */
2214 give_local_error(ERRMESS_VLONGHDRLINE,
2215 string_sprintf("message header line longer than %d characters "
2216 "received: message not accepted", header_line_maxsize), US"",
2217 error_rc, stdin, header_list->next);
2218 /* Does not return */
2221 /* Note if any resent- fields exist. */
2223 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2225 resents_exist = TRUE;
2226 resent_prefix = US"Resent-";
2230 /* Reject CHUNKING messages that do not CRLF their first header line */
2232 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2234 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2235 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2237 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2238 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2239 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2242 goto TIDYUP; /* Skip to end of function */
2245 /* The line has been handled. If we have hit EOF, break out of the loop,
2246 indicating no pending data line. */
2248 if (ch == EOF) { next = NULL; break; }
2250 /* Set up for the next header */
2252 reset_point = store_mark();
2254 next = store_get(sizeof(header_line), FALSE);
2255 next->text = store_get(header_size, TRUE);
2258 prevlines_length = 0;
2259 } /* Continue, starting to read the next header */
2261 /* At this point, we have read all the headers into a data structure in main
2262 store. The first header is still the dummy placeholder for the Received: header
2263 we are going to generate a bit later on. If next != NULL, it contains the first
2264 data line - which terminated the headers before reaching a blank line (not the
2269 debug_printf(">>Headers received:\n");
2270 for (header_line * h = header_list->next; h; h = h->next)
2271 debug_printf("%s", h->text);
2275 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2276 is dropped immediately after valid headers, the next thing we will see is EOF.
2277 We must test for this specially, as further down the reading of the data is
2278 skipped if already at EOF. */
2280 if (smtp_input && (receive_feof)())
2282 smtp_reply = handle_lost_connection(US" (after header)");
2284 goto TIDYUP; /* Skip to end of function */
2287 /* If this is a filter test run and no headers were read, output a warning
2288 in case there is a mistake in the test message. */
2290 if (filter_test != FTEST_NONE && header_list->next == NULL)
2291 printf("Warning: no message headers read\n");
2294 /* Scan the headers to identify them. Some are merely marked for later
2295 processing; some are dealt with here. */
2297 for (header_line * h = header_list->next; h; h = h->next)
2299 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2300 if (is_resent) contains_resent_headers = TRUE;
2302 switch (header_checkname(h, is_resent))
2305 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2309 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2312 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2315 if (!resents_exist || is_resent) date_header_exists = TRUE;
2318 /* Same comments as about Return-Path: below. */
2320 case htype_delivery_date:
2321 if (delivery_date_remove) h->type = htype_old;
2324 /* Same comments as about Return-Path: below. */
2326 case htype_envelope_to:
2327 if (envelope_to_remove) h->type = htype_old;
2330 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2331 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2332 header consists of just the login id of the user who called Exim, rewrite
2333 it with the gecos field first. Apply this rule to Resent-From: if there
2334 are resent- fields. */
2337 h->type = htype_from;
2338 if (!resents_exist || is_resent)
2344 uschar *s = Ustrchr(h->text, ':') + 1;
2345 while (isspace(*s)) s++;
2346 len = h->slen - (s - h->text) - 1;
2347 if (Ustrlen(originator_login) == len &&
2348 strncmpic(s, originator_login, len) == 0)
2350 uschar *name = is_resent? US"Resent-From" : US"From";
2351 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2352 originator_login, qualify_domain_sender);
2353 from_header = header_last;
2354 h->type = htype_old;
2355 DEBUG(D_receive|D_rewrite)
2356 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2362 /* Identify the Message-id: header for generating "in-reply-to" in the
2363 autoreply transport. For incoming logging, save any resent- value. In both
2364 cases, take just the first of any multiples. */
2367 if (!msgid_header && (!resents_exist || is_resent))
2374 /* Flag all Received: headers */
2376 case htype_received:
2377 h->type = htype_received;
2381 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2383 case htype_reply_to:
2384 h->type = htype_reply_to;
2387 /* The Return-path: header is supposed to be added to messages when
2388 they leave the SMTP system. We shouldn't receive messages that already
2389 contain Return-path. However, since Exim generates Return-path: on
2390 local delivery, resent messages may well contain it. We therefore
2391 provide an option (which defaults on) to remove any Return-path: headers
2392 on input. Removal actually means flagging as "old", which prevents the
2393 header being transmitted with the message. */
2395 case htype_return_path:
2396 if (return_path_remove) h->type = htype_old;
2398 /* If we are testing a mail filter file, use the value of the
2399 Return-Path: header to set up the return_path variable, which is not
2400 otherwise set. However, remove any <> that surround the address
2401 because the variable doesn't have these. */
2403 if (filter_test != FTEST_NONE)
2405 uschar *start = h->text + 12;
2406 uschar *end = start + Ustrlen(start);
2407 while (isspace(*start)) start++;
2408 while (end > start && isspace(end[-1])) end--;
2409 if (*start == '<' && end[-1] == '>')
2414 return_path = string_copyn(start, end - start);
2415 printf("Return-path taken from \"Return-path:\" header line\n");
2419 /* If there is a "Sender:" header and the message is locally originated,
2420 and from an untrusted caller and suppress_local_fixups is not set, or if we
2421 are in submission mode for a remote message, mark it "old" so that it will
2422 not be transmitted with the message, unless active_local_sender_retain is
2423 set. (This can only be true if active_local_from_check is false.) If there
2424 are any resent- headers in the message, apply this rule to Resent-Sender:
2425 instead of Sender:. Messages with multiple resent- header sets cannot be
2426 tidily handled. (For this reason, at least one MUA - Pine - turns old
2427 resent- headers into X-resent- headers when resending, leaving just one
2431 h->type = !f.active_local_sender_retain
2432 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2433 || f.submission_mode
2435 && (!resents_exist || is_resent)
2436 ? htype_old : htype_sender;
2439 /* Remember the Subject: header for logging. There is no Resent-Subject */
2445 /* "To:" gets flagged, and the existence of a recipient header is noted,
2446 whether it's resent- or not. */
2451 to_or_cc_header_exists = TRUE;
2457 /* Extract recipients from the headers if that is required (the -t option).
2458 Note that this is documented as being done *before* any address rewriting takes
2459 place. There are two possibilities:
2461 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2462 recipients already listed are to be REMOVED from the message. Smail 3 works
2463 like this. We need to build a non-recipients tree for that list, because in
2464 subsequent processing this data is held in a tree and that's what the
2465 spool_write_header() function expects. Make sure that non-recipient addresses
2466 are fully qualified and rewritten if necessary.
2468 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2469 those in the command line arguments (and it is rumoured some other MTAs do
2470 this). Therefore, there is an option to make Exim behave this way.
2472 *** Notes on "Resent-" header lines ***
2474 The presence of resent-headers in the message makes -t horribly ambiguous.
2475 Experiments with sendmail showed that it uses recipients for all resent-
2476 headers, totally ignoring the concept of "sets of resent- headers" as described
2477 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2478 with all the addresses in one instance of each header.
2480 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2481 error for -t if there were resent- headers in the message. However, after a
2482 discussion on the mailing list, I've learned that there are MUAs that use
2483 resent- headers with -t, and also that the stuff about sets of resent- headers
2484 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2485 message with -t and resent- header lines makes sure that only *its* resent-
2486 headers are present; previous ones are often renamed as X-resent- for example.
2488 Consequently, Exim has been changed so that, if any resent- header lines are
2489 present, the recipients are taken from all of the appropriate resent- lines,
2490 and not from the ordinary To:, Cc:, etc. */
2495 error_block **bnext = &bad_addresses;
2497 if (extract_addresses_remove_arguments)
2499 while (recipients_count-- > 0)
2501 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2502 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2503 tree_add_nonrecipient(s);
2505 recipients_list = NULL;
2506 recipients_count = recipients_list_max = 0;
2509 /* Now scan the headers */
2511 for (header_line * h = header_list->next; h; h = h->next)
2513 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2514 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2516 uschar *s = Ustrchr(h->text, ':') + 1;
2517 while (isspace(*s)) s++;
2519 f.parse_allow_group = TRUE; /* Allow address group syntax */
2523 uschar *ss = parse_find_address_end(s, FALSE);
2524 uschar *recipient, *errmess, *pp;
2525 int start, end, domain;
2527 /* Check on maximum */
2529 if (recipients_max > 0 && ++rcount > recipients_max)
2530 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2531 US"message rejected: ", error_rc, stdin, NULL);
2532 /* Does not return */
2534 /* Make a copy of the address, and remove any internal newlines. These
2535 may be present as a result of continuations of the header line. The
2536 white space that follows the newline must not be removed - it is part
2539 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2540 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2545 BOOL b = allow_utf8_domains;
2546 allow_utf8_domains = TRUE;
2548 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2552 if (string_is_utf8(recipient))
2553 message_smtputf8 = TRUE;
2555 allow_utf8_domains = b;
2559 /* Keep a list of all the bad addresses so we can send a single
2560 error message at the end. However, an empty address is not an error;
2561 just ignore it. This can come from an empty group list like
2563 To: Recipients of list:;
2565 If there are no recipients at all, an error will occur later. */
2567 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2569 int len = Ustrlen(s);
2570 error_block *b = store_get(sizeof(error_block), FALSE);
2571 while (len > 0 && isspace(s[len-1])) len--;
2573 b->text1 = string_printing(string_copyn(s, len));
2579 /* If the recipient is already in the nonrecipients tree, it must
2580 have appeared on the command line with the option extract_addresses_
2581 remove_arguments set. Do not add it to the recipients, and keep a note
2582 that this has happened, in order to give a better error if there are
2583 no recipients left. */
2585 else if (recipient != NULL)
2587 if (tree_search(tree_nonrecipients, recipient) == NULL)
2588 receive_add_recipient(recipient, -1);
2590 extracted_ignored = TRUE;
2593 /* Move on past this address */
2595 s = ss + (*ss? 1:0);
2596 while (isspace(*s)) s++;
2597 } /* Next address */
2599 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2600 f.parse_found_group = FALSE;
2602 /* If this was the bcc: header, mark it "old", which means it
2603 will be kept on the spool, but not transmitted as part of the
2606 if (h->type == htype_bcc) h->type = htype_old;
2607 } /* For appropriate header line */
2608 } /* For each header line */
2612 /* Now build the unique message id. This has changed several times over the
2613 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2614 Retaining all the history in the comment has become too unwieldy - read
2615 previous release sources if you want it.
2617 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2618 The first part is the current time, in seconds. The second part is the current
2619 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2620 can hold a number in the range 0-3843. It used to be a computed sequence
2621 number, but is now the fractional component of the current time in units of
2622 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2623 received, Exim ensures that the timer has ticked at the appropriate level
2624 before proceeding, to avoid duplication if the pid happened to be re-used
2625 within the same time period. It seems likely that most messages will take at
2626 least half a millisecond to be received, so no delay will normally be
2627 necessary. At least for some time...
2629 There is a modification when localhost_number is set. Formerly this was allowed
2630 to be as large as 255. Now it is restricted to the range 0-16, and the final
2631 component of the message id becomes (localhost_number * 200) + fractional time
2632 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2634 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2635 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2636 still allows the tttttt field to hold a large enough number to last for some
2637 more decades, and the final two-digit field can hold numbers up to 1295, which
2638 is enough for milliseconds (instead of 1/2000 of a second).
2640 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2641 pid, so it is probably safe because pids have to be positive. The
2642 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2643 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2645 Note that string_base62() returns its data in a static storage block, so it
2646 must be copied before calling string_base62() again. It always returns exactly
2649 There doesn't seem to be anything in the RFC which requires a message id to
2650 start with a letter, but Smail was changed to ensure this. The external form of
2651 the message id (as supplied by string expansion) therefore starts with an
2652 additional leading 'E'. The spool file names do not include this leading
2653 letter and it is not used internally.
2655 NOTE: If ever the format of message ids is changed, the regular expression for
2656 checking that a string is in this format must be updated in a corresponding
2657 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2658 must also be changed to reflect the correct string length. The queue-sort code
2659 needs to know the layout. Then, of course, other programs that rely on the
2660 message id format will need updating too. */
2662 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2663 message_id[6] = '-';
2664 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2666 /* Deal with the case where the host number is set. The value of the number was
2667 checked when it was read, to ensure it isn't too big. The timing granularity is
2668 left in id_resolution so that an appropriate wait can be done after receiving
2669 the message, if necessary (we hope it won't be). */
2671 if (host_number_string)
2673 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2674 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2675 string_base62((long int)(
2676 host_number * (1000000/id_resolution) +
2677 message_id_tv.tv_usec/id_resolution)) + 4);
2680 /* Host number not set: final field is just the fractional time at an
2681 appropriate resolution. */
2685 id_resolution = BASE_62 == 62 ? 500 : 1000;
2686 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2687 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2690 /* Add the current message id onto the current process info string if
2693 (void)string_format(process_info + process_info_len,
2694 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2696 /* If we are using multiple input directories, set up the one for this message
2697 to be the least significant base-62 digit of the time of arrival. Otherwise
2698 ensure that it is an empty string. */
2700 set_subdir_str(message_subdir, message_id, 0);
2702 /* Now that we have the message-id, if there is no message-id: header, generate
2703 one, but only for local (without suppress_local_fixups) or submission mode
2704 messages. This can be user-configured if required, but we had better flatten
2705 any illegal characters therein. */
2708 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2710 uschar *id_text = US"";
2711 uschar *id_domain = primary_hostname;
2714 /* Permit only letters, digits, dots, and hyphens in the domain */
2716 if (message_id_domain)
2718 uschar *new_id_domain = expand_string(message_id_domain);
2721 if (!f.expand_string_forcedfail)
2722 log_write(0, LOG_MAIN|LOG_PANIC,
2723 "expansion of \"%s\" (message_id_header_domain) "
2724 "failed: %s", message_id_domain, expand_string_message);
2726 else if (*new_id_domain)
2728 id_domain = new_id_domain;
2729 for (uschar * p = id_domain; *p; p++)
2730 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2734 /* Permit all characters except controls and RFC 2822 specials in the
2735 additional text part. */
2737 if (message_id_text)
2739 uschar *new_id_text = expand_string(message_id_text);
2742 if (!f.expand_string_forcedfail)
2743 log_write(0, LOG_MAIN|LOG_PANIC,
2744 "expansion of \"%s\" (message_id_header_text) "
2745 "failed: %s", message_id_text, expand_string_message);
2747 else if (*new_id_text)
2749 id_text = new_id_text;
2750 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2754 /* Add the header line.
2755 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2756 appended, to preserve classical expectations of header ordering. */
2758 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2759 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2760 *id_text == 0 ? "" : ".", id_text, id_domain);
2762 /* Arrange for newly-created Message-Id to be logged */
2766 msgid_header_newly_created = TRUE;
2771 /* If we are to log recipients, keep a copy of the raw ones before any possible
2772 rewriting. Must copy the count, because later ACLs and the local_scan()
2773 function may mess with the real recipients. */
2775 if (LOGGING(received_recipients))
2777 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2778 for (int i = 0; i < recipients_count; i++)
2779 raw_recipients[i] = string_copy(recipients_list[i].address);
2780 raw_recipients_count = recipients_count;
2783 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2784 recipients will get here only if the conditions were right (allow_unqualified_
2785 recipient is TRUE). */
2787 for (int i = 0; i < recipients_count; i++)
2788 recipients_list[i].address =
2789 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2790 global_rewrite_rules, rewrite_existflags);
2792 /* If there is no From: header, generate one for local (without
2793 suppress_local_fixups) or submission_mode messages. If there is no sender
2794 address, but the sender is local or this is a local delivery error, use the
2795 originator login. This shouldn't happen for genuine bounces, but might happen
2796 for autoreplies. The addition of From: must be done *before* checking for the
2797 possible addition of a Sender: header, because untrusted_set_sender allows an
2798 untrusted user to set anything in the envelope (which might then get info
2799 From:) but we still want to ensure a valid Sender: if it is required. */
2802 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2804 uschar *oname = US"";
2806 /* Use the originator_name if this is a locally submitted message and the
2807 caller is not trusted. For trusted callers, use it only if -F was used to
2808 force its value or if we have a non-SMTP message for which -f was not used
2809 to set the sender. */
2811 if (!sender_host_address)
2813 if (!f.trusted_caller || f.sender_name_forced ||
2814 (!smtp_input && !f.sender_address_forced))
2815 oname = originator_name;
2818 /* For non-locally submitted messages, the only time we use the originator
2819 name is when it was forced by the /name= option on control=submission. */
2821 else if (submission_name) oname = submission_name;
2823 /* Envelope sender is empty */
2825 if (!*sender_address)
2827 uschar *fromstart, *fromend;
2829 fromstart = string_sprintf("%sFrom: %s%s",
2830 resent_prefix, oname, *oname ? " <" : "");
2831 fromend = *oname ? US">" : US"";
2833 if (f.sender_local || f.local_error_message)
2834 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2835 local_part_quote(originator_login), qualify_domain_sender,
2838 else if (f.submission_mode && authenticated_id)
2840 if (!submission_domain)
2841 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2842 local_part_quote(authenticated_id), qualify_domain_sender,
2845 else if (!*submission_domain) /* empty => whole address set */
2846 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2850 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2851 local_part_quote(authenticated_id), submission_domain, fromend);
2853 from_header = header_last; /* To get it checked for Sender: */
2857 /* There is a non-null envelope sender. Build the header using the original
2858 sender address, before any rewriting that might have been done while
2863 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2866 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2869 from_header = header_last; /* To get it checked for Sender: */
2874 /* If the sender is local (without suppress_local_fixups), or if we are in
2875 submission mode and there is an authenticated_id, check that an existing From:
2876 is correct, and if not, generate a Sender: header, unless disabled. Any
2877 previously-existing Sender: header was removed above. Note that sender_local,
2878 as well as being TRUE if the caller of exim is not trusted, is also true if a
2879 trusted caller did not supply a -f argument for non-smtp input. To allow
2880 trusted callers to forge From: without supplying -f, we have to test explicitly
2881 here. If the From: header contains more than one address, then the call to
2882 parse_extract_address fails, and a Sender: header is inserted, as required. */
2885 && ( f.active_local_from_check
2886 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2887 || f.submission_mode && authenticated_id
2890 BOOL make_sender = TRUE;
2891 int start, end, domain;
2893 uschar *from_address =
2894 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2895 &start, &end, &domain, FALSE);
2896 uschar *generated_sender_address;
2898 generated_sender_address = f.submission_mode
2899 ? !submission_domain
2900 ? string_sprintf("%s@%s",
2901 local_part_quote(authenticated_id), qualify_domain_sender)
2902 : !*submission_domain /* empty => full address */
2903 ? string_sprintf("%s", authenticated_id)
2904 : string_sprintf("%s@%s",
2905 local_part_quote(authenticated_id), submission_domain)
2906 : string_sprintf("%s@%s",
2907 local_part_quote(originator_login), qualify_domain_sender);
2909 /* Remove permitted prefixes and suffixes from the local part of the From:
2910 address before doing the comparison with the generated sender. */
2915 uschar *at = domain ? from_address + domain - 1 : NULL;
2918 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2919 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2921 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2922 from_address += slen;
2926 if ( strcmpic(generated_sender_address, from_address) == 0
2927 || (!domain && strcmpic(from_address, originator_login) == 0))
2928 make_sender = FALSE;
2931 /* We have to cause the Sender header to be rewritten if there are
2932 appropriate rewriting rules. */
2935 if (f.submission_mode && !submission_name)
2936 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2937 generated_sender_address);
2939 header_add(htype_sender, "%sSender: %s <%s>\n",
2941 f.submission_mode ? submission_name : originator_name,
2942 generated_sender_address);
2944 /* Ensure that a non-null envelope sender address corresponds to the
2945 submission mode sender address. */
2947 if (f.submission_mode && *sender_address)
2949 if (!sender_address_unrewritten)
2950 sender_address_unrewritten = sender_address;
2951 sender_address = generated_sender_address;
2952 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2953 log_write(L_address_rewrite, LOG_MAIN,
2954 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2955 sender_address_unrewritten, generated_sender_address);
2959 /* If there are any rewriting rules, apply them to the sender address, unless
2960 it has already been rewritten as part of verification for SMTP input. */
2962 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2964 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2965 global_rewrite_rules, rewrite_existflags);
2966 DEBUG(D_receive|D_rewrite)
2967 debug_printf("rewritten sender = %s\n", sender_address);
2971 /* The headers must be run through rewrite_header(), because it ensures that
2972 addresses are fully qualified, as well as applying any rewriting rules that may
2975 Qualification of header addresses in a message from a remote host happens only
2976 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2977 appropriate. For local messages, qualification always happens, unless -bnq is
2978 used to explicitly suppress it. No rewriting is done for an unqualified address
2979 that is left untouched.
2981 We start at the second header, skipping our own Received:. This rewriting is
2982 documented as happening *after* recipient addresses are taken from the headers
2983 by the -t command line option. An added Sender: gets rewritten here. */
2985 for (header_line * h = header_list->next; h; h = h->next)
2987 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2988 rewrite_existflags, TRUE);
2993 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2994 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2995 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2996 exists, this applies to the set of resent- headers rather than the normal set.
2998 The requirement for a recipient header has been removed in RFC 2822. At this
2999 point in the code, earlier versions of Exim added a To: header for locally
3000 submitted messages, and an empty Bcc: header for others. In the light of the
3001 changes in RFC 2822, this was dropped in November 2003. */
3004 /* If there is no date header, generate one if the message originates locally
3005 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3006 submission mode flag is set. Messages without Date: are not valid, but it seems
3007 to be more confusing if Exim adds one to all remotely-originated messages.
3008 As per Message-Id, we prepend if resending, else append.
3011 if ( !date_header_exists
3012 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3013 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3014 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3016 search_tidyup(); /* Free any cached resources */
3018 /* Show the complete set of headers if debugging. Note that the first one (the
3019 new Received:) has not yet been set. */
3023 debug_printf(">>Headers after rewriting and local additions:\n");
3024 for (header_line * h = header_list->next; h; h = h->next)
3025 debug_printf("%c %s", h->type, h->text);
3029 /* The headers are now complete in store. If we are running in filter
3030 testing mode, that is all this function does. Return TRUE if the message
3031 ended with a dot. */
3033 if (filter_test != FTEST_NONE)
3035 process_info[process_info_len] = 0;
3036 return message_ended == END_DOT;
3039 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3040 think more if it could be handled. Cannot do onward CHUNKING unless
3041 inbound is, but inbound chunking ought to be ok with outbound plain.
3042 Could we do onward CHUNKING given inbound CHUNKING?
3044 if (chunking_state > CHUNKING_OFFERED)
3045 cancel_cutthrough_connection(FALSE, US"chunking active");
3047 /* Cutthrough delivery:
3048 We have to create the Received header now rather than at the end of reception,
3049 so the timestamp behaviour is a change to the normal case.
3050 Having created it, send the headers to the destination. */
3052 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3054 if (received_count > received_headers_max)
3056 cancel_cutthrough_connection(TRUE, US"too many headers");
3057 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3058 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3059 "Too many \"Received\" headers",
3061 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3062 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3063 message_id[0] = 0; /* Indicate no message accepted */
3064 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3065 goto TIDYUP; /* Skip to end of function */
3067 received_header_gen();
3068 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3069 (void) cutthrough_headers_send();
3073 /* Open a new spool file for the data portion of the message. We need
3074 to access it both via a file descriptor and a stream. Try to make the
3075 directory if it isn't there. */
3077 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3078 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3080 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3082 if (errno == ENOENT)
3084 (void) directory_make(spool_directory,
3085 spool_sname(US"input", message_subdir),
3086 INPUT_DIRECTORY_MODE, TRUE);
3087 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3090 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3091 spool_name, strerror(errno));
3094 /* Make sure the file's group is the Exim gid, and double-check the mode
3095 because the group setting doesn't always get set automatically. */
3097 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3098 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3099 "Failed setting ownership on spool file %s: %s",
3100 spool_name, strerror(errno));
3101 (void)fchmod(data_fd, SPOOL_MODE);
3103 /* We now have data file open. Build a stream for it and lock it. We lock only
3104 the first line of the file (containing the message ID) because otherwise there
3105 are problems when Exim is run under Cygwin (I'm told). See comments in
3106 spool_in.c, where the same locking is done. */
3108 spool_data_file = fdopen(data_fd, "w+");
3109 lock_data.l_type = F_WRLCK;
3110 lock_data.l_whence = SEEK_SET;
3111 lock_data.l_start = 0;
3112 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3114 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3115 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3116 errno, strerror(errno));
3118 /* We have an open, locked data file. Write the message id to it to make it
3119 self-identifying. Then read the remainder of the input of this message and
3120 write it to the data file. If the variable next != NULL, it contains the first
3121 data line (which was read as a header but then turned out not to have the right
3122 format); write it (remembering that it might contain binary zeros). The result
3123 of fwrite() isn't inspected; instead we call ferror() below. */
3125 fprintf(spool_data_file, "%s-D\n", message_id);
3128 uschar *s = next->text;
3129 int len = next->slen;
3130 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3131 body_linecount++; /* Assumes only 1 line */
3134 /* Note that we might already be at end of file, or the logical end of file
3135 (indicated by '.'), or might have encountered an error while writing the
3136 message id or "next" line. */
3138 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3142 message_ended = chunking_state <= CHUNKING_OFFERED
3143 ? read_message_data_smtp(spool_data_file)
3145 ? read_message_bdat_smtp_wire(spool_data_file)
3146 : read_message_bdat_smtp(spool_data_file);
3147 receive_linecount++; /* The terminating "." line */
3150 message_ended = read_message_data(spool_data_file);
3152 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3153 message_linecount += body_linecount;
3155 switch (message_ended)
3157 /* Handle premature termination of SMTP */
3162 Uunlink(spool_name); /* Lose data file when closed */
3163 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3164 message_id[0] = 0; /* Indicate no message accepted */
3165 smtp_reply = handle_lost_connection(US"");
3167 goto TIDYUP; /* Skip to end of function */
3171 /* Handle message that is too big. Don't use host_or_ident() in the log
3172 message; we want to see the ident value even for non-remote messages. */
3175 Uunlink(spool_name); /* Lose the data file when closed */
3176 cancel_cutthrough_connection(TRUE, US"mail too big");
3177 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3179 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3180 "message too big: read=%d max=%d",
3182 sender_fullhost ? " H=" : "",
3183 sender_fullhost ? sender_fullhost : US"",
3184 sender_ident ? " U=" : "",
3185 sender_ident ? sender_ident : US"",
3187 thismessage_size_limit);
3191 smtp_reply = US"552 Message size exceeds maximum permitted";
3192 message_id[0] = 0; /* Indicate no message accepted */
3193 goto TIDYUP; /* Skip to end of function */
3197 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3198 give_local_error(ERRMESS_TOOBIG,
3199 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3200 US"message rejected: ", error_rc, spool_data_file, header_list);
3201 /* Does not return */
3205 /* Handle bad BDAT protocol sequence */
3208 Uunlink(spool_name); /* Lose the data file when closed */
3209 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3210 smtp_reply = US""; /* Response already sent */
3211 message_id[0] = 0; /* Indicate no message accepted */
3212 goto TIDYUP; /* Skip to end of function */
3216 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3217 example, there may be some expansion in an ACL that uses a timer.) */
3219 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3221 /* The message body has now been read into the data file. Call fflush() to
3222 empty the buffers in C, and then call fsync() to get the data written out onto
3223 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3224 having to do this). If there was an I/O error on either input or output,
3225 attempt to send an error message, and unlink the spool file. For non-SMTP input
3226 we can then give up. Note that for SMTP input we must swallow the remainder of
3227 the input in cases of output errors, since the far end doesn't expect to see
3228 anything until the terminating dot line is sent. */
3230 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3231 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3233 uschar *msg_errno = US strerror(errno);
3234 BOOL input_error = (receive_ferror)() != 0;
3235 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3236 input_error? "Input read" : "Spool write",
3238 sender_fullhost ? sender_fullhost : sender_ident);
3240 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3241 Uunlink(spool_name); /* Lose the data file */
3242 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3247 smtp_reply = US"451 Error while reading input data";
3250 smtp_reply = US"451 Error while writing spool file";
3251 receive_swallow_smtp();
3253 message_id[0] = 0; /* Indicate no message accepted */
3254 goto TIDYUP; /* Skip to end of function */
3259 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3260 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3262 /* Does not return */
3267 /* No I/O errors were encountered while writing the data file. */
3269 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3270 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3273 /* If there were any bad addresses extracted by -t, or there were no recipients
3274 left after -t, send a message to the sender of this message, or write it to
3275 stderr if the error handling option is set that way. Note that there may
3276 legitimately be no recipients for an SMTP message if they have all been removed
3279 We need to rewind the data file in order to read it. In the case of no
3280 recipients or stderr error writing, throw the data file away afterwards, and
3281 exit. (This can't be SMTP, which always ensures there's at least one
3282 syntactically good recipient address.) */
3284 if (extract_recip && (bad_addresses || recipients_count == 0))
3288 if (recipients_count == 0) debug_printf("*** No recipients\n");
3291 debug_printf("*** Bad address(es)\n");
3292 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3293 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3297 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3298 message_id, bad_addresses ? "bad addresses" : "no recipients");
3300 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3302 /* If configured to send errors to the sender, but this fails, force
3303 a failure error code. We use a special one for no recipients so that it
3304 can be detected by the autoreply transport. Otherwise error_rc is set to
3305 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3306 it is EXIT_SUCCESS. */
3308 if (error_handling == ERRORS_SENDER)
3310 if (!moan_to_sender(
3312 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3313 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3314 bad_addresses, header_list, spool_data_file, FALSE
3316 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3321 if (extracted_ignored)
3322 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3324 fprintf(stderr, "exim: no recipients in message\n");
3327 fprintf(stderr, "exim: invalid address%s",
3328 bad_addresses->next ? "es:\n" : ":");
3329 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3330 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3331 bad_addresses->text2);
3335 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3337 Uunlink(spool_name);
3338 (void)fclose(spool_data_file);
3339 exim_exit(error_rc, US"receiving");
3343 /* Data file successfully written. Generate text for the Received: header by
3344 expanding the configured string, and adding a timestamp. By leaving this
3345 operation till now, we ensure that the timestamp is the time that message
3346 reception was completed. However, this is deliberately done before calling the
3347 data ACL and local_scan().
3349 This Received: header may therefore be inspected by the data ACL and by code in
3350 the local_scan() function. When they have run, we update the timestamp to be
3351 the final time of reception.
3353 If there is just one recipient, set up its value in the $received_for variable
3354 for use when we generate the Received: header.
3356 Note: the checking for too many Received: headers is handled by the delivery
3358 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3360 if (!received_header->text) /* Non-cutthrough case */
3362 received_header_gen();
3364 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3366 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3367 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3369 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3370 now, before running the DATA ACL. */
3372 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3375 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3376 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3378 /* If an ACL is specified for checking things at this stage of reception of a
3379 message, run it, unless all the recipients were removed by "discard" in earlier
3380 ACLs. That is the only case in which recipients_count can be zero at this
3381 stage. Set deliver_datafile to point to the data file so that $message_body and
3382 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3385 deliver_datafile = data_fd;
3388 f.enable_dollar_recipients = TRUE;
3390 if (recipients_count == 0)
3391 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3395 /* Handle interactive SMTP messages */
3397 if (smtp_input && !smtp_batched_input)
3400 #ifndef DISABLE_DKIM
3401 if (!f.dkim_disable_verify)
3403 /* Finish verification */
3404 dkim_exim_verify_finish();
3406 /* Check if we must run the DKIM ACL */
3407 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3409 uschar * dkim_verify_signers_expanded =
3410 expand_string(dkim_verify_signers);
3411 gstring * results = NULL;
3415 gstring * seen_items = NULL;
3416 int old_pool = store_pool;
3418 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3420 if (!(ptr = dkim_verify_signers_expanded))
3421 log_write(0, LOG_MAIN|LOG_PANIC,
3422 "expansion of dkim_verify_signers option failed: %s",
3423 expand_string_message);
3425 /* Default to OK when no items are present */
3427 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3429 /* Prevent running ACL for an empty item */
3430 if (!item || !*item) continue;
3432 /* Only run ACL once for each domain or identity,
3433 no matter how often it appears in the expanded list. */
3437 const uschar * seen_items_list = string_from_gstring(seen_items);
3439 BOOL seen_this_item = FALSE;
3441 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3443 if (Ustrcmp(seen_item,item) == 0)
3445 seen_this_item = TRUE;
3452 debug_printf("acl_smtp_dkim: skipping signer %s, "
3453 "already seen\n", item);
3457 seen_items = string_catn(seen_items, US":", 1);
3459 seen_items = string_cat(seen_items, item);
3461 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3465 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3466 "skipping remaining items\n", rc, item);
3467 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3471 dkim_verify_status = string_from_gstring(results);
3472 store_pool = old_pool;
3473 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3476 recipients_count = 0;
3477 blackholed_by = US"DKIM ACL";
3479 blackhole_log_msg = string_sprintf(": %s", log_msg);
3483 Uunlink(spool_name);
3484 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3485 smtp_yield = FALSE; /* No more messages after dropped connection */
3486 smtp_reply = US""; /* Indicate reply already sent */
3487 message_id[0] = 0; /* Indicate no message accepted */
3488 goto TIDYUP; /* Skip to end of function */
3492 dkim_exim_verify_log_all();
3494 #endif /* DISABLE_DKIM */
3496 #ifdef WITH_CONTENT_SCAN
3497 if ( recipients_count > 0
3499 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3502 #endif /* WITH_CONTENT_SCAN */
3504 #ifdef SUPPORT_DMARC
3505 dmarc_store_data(from_header);
3508 #ifndef DISABLE_PRDR
3509 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3512 int all_fail = FAIL;
3514 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3515 /* Loop through recipients, responses must be in same order received */
3516 for (unsigned int c = 0; recipients_count > c; c++)
3518 uschar * addr= recipients_list[c].address;
3519 uschar * msg= US"PRDR R=<%s> %s";
3522 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3523 addr, c+1, recipients_count);
3524 rc = acl_check(ACL_WHERE_PRDR, addr,
3525 acl_smtp_data_prdr, &user_msg, &log_msg);
3527 /* If any recipient rejected content, indicate it in final message */
3529 /* If all recipients rejected, indicate in final message */
3534 case OK: case DISCARD: code = US"250"; break;
3535 case DEFER: code = US"450"; break;
3536 default: code = US"550"; break;
3538 if (user_msg != NULL)
3539 smtp_user_msg(code, user_msg);
3544 case OK: case DISCARD:
3545 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3547 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3549 msg = string_sprintf(CS msg, addr, "refusal"); break;
3551 smtp_user_msg(code, msg);
3553 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3554 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3555 else log_write(0, LOG_MAIN, "%s", CS msg);
3557 if (rc != OK) { receive_remove_recipient(addr); c--; }
3559 /* Set up final message, used if data acl gives OK */
3560 smtp_reply = string_sprintf("%s id=%s message %s",
3561 all_fail == FAIL ? US"550" : US"250",
3564 ? US"rejected for all recipients"
3567 : US"accepted for some recipients");
3568 if (recipients_count == 0)
3570 message_id[0] = 0; /* Indicate no message accepted */
3575 prdr_requested = FALSE;
3576 #endif /* !DISABLE_PRDR */
3578 /* Check the recipients count again, as the MIME ACL might have changed
3581 if (acl_smtp_data != NULL && recipients_count > 0)
3583 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3584 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3587 recipients_count = 0;
3588 blackholed_by = US"DATA ACL";
3590 blackhole_log_msg = string_sprintf(": %s", log_msg);
3591 cancel_cutthrough_connection(TRUE, US"data acl discard");
3595 Uunlink(spool_name);
3596 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3597 #ifdef WITH_CONTENT_SCAN
3600 #ifdef EXPERIMENTAL_DCC
3603 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3604 smtp_yield = FALSE; /* No more messages after dropped connection */
3605 smtp_reply = US""; /* Indicate reply already sent */
3606 message_id[0] = 0; /* Indicate no message accepted */
3607 goto TIDYUP; /* Skip to end of function */
3612 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3613 we cannot take different actions for permanent and temporary rejections. */
3618 #ifdef WITH_CONTENT_SCAN
3619 if ( acl_not_smtp_mime
3620 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3624 #endif /* WITH_CONTENT_SCAN */
3628 uschar *user_msg, *log_msg;
3629 f.authentication_local = TRUE;
3630 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3633 recipients_count = 0;
3634 blackholed_by = US"non-SMTP ACL";
3636 blackhole_log_msg = string_sprintf(": %s", log_msg);
3640 Uunlink(spool_name);
3641 #ifdef WITH_CONTENT_SCAN
3644 #ifdef EXPERIMENTAL_DCC
3647 /* The ACL can specify where rejections are to be logged, possibly
3648 nowhere. The default is main and reject logs. */
3650 if (log_reject_target)
3651 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3652 sender_address, log_msg);
3654 if (!user_msg) user_msg = US"local configuration problem";
3655 if (smtp_batched_input)
3656 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3657 /* Does not return */
3660 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3661 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3662 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3664 /* Does not return */
3667 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3671 /* The applicable ACLs have been run */
3673 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3674 if (f.queue_only_policy) queued_by = US"ACL";
3677 #ifdef WITH_CONTENT_SCAN
3681 #ifdef EXPERIMENTAL_DCC
3686 #ifdef HAVE_LOCAL_SCAN
3687 /* The final check on the message is to run the scan_local() function. The
3688 version supplied with Exim always accepts, but this is a hook for sysadmins to
3689 supply their own checking code. The local_scan() function is run even when all
3690 the recipients have been discarded. */
3692 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3694 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3695 deleted, and the incident gets logged. */
3697 if (sigsetjmp(local_scan_env, 1) == 0)
3699 had_local_scan_crash = 0;
3700 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3701 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3702 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3703 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3705 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3706 local_scan_timeout);
3707 local_scan_data = NULL;
3709 had_local_scan_timeout = 0;
3710 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3711 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3712 rc = local_scan(data_fd, &local_scan_data);
3714 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3716 f.enable_dollar_recipients = FALSE;
3718 store_pool = POOL_MAIN; /* In case changed */
3719 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3722 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3723 os_non_restarting_signal(SIGFPE, SIG_DFL);
3724 os_non_restarting_signal(SIGILL, SIG_DFL);
3725 os_non_restarting_signal(SIGBUS, SIG_DFL);
3729 if (had_local_scan_crash)
3731 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3732 "signal %d - message temporarily rejected (size %d)",
3733 had_local_scan_crash, message_size);
3734 receive_bomb_out(US"local-scan-error", US"local verification problem");
3735 /* Does not return */
3737 if (had_local_scan_timeout)
3739 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3740 "message temporarily rejected (size %d)", message_size);
3741 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3742 /* Does not return */
3746 /* The length check is paranoia against some runaway code, and also because
3747 (for a success return) lines in the spool file are read into big_buffer. */
3749 if (local_scan_data)
3751 int len = Ustrlen(local_scan_data);
3752 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3753 local_scan_data = string_copyn(local_scan_data, len);
3756 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3758 if (!f.deliver_freeze) /* ACL might have already frozen */
3760 f.deliver_freeze = TRUE;
3761 deliver_frozen_at = time(NULL);
3762 frozen_by = US"local_scan()";
3764 rc = LOCAL_SCAN_ACCEPT;
3766 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3768 if (!f.queue_only_policy) /* ACL might have already queued */
3770 f.queue_only_policy = TRUE;
3771 queued_by = US"local_scan()";
3773 rc = LOCAL_SCAN_ACCEPT;
3776 /* Message accepted: remove newlines in local_scan_data because otherwise
3777 the spool file gets corrupted. Ensure that all recipients are qualified. */
3779 if (rc == LOCAL_SCAN_ACCEPT)
3781 if (local_scan_data)
3782 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3783 for (int i = 0; i < recipients_count; i++)
3785 recipient_item *r = recipients_list + i;
3786 r->address = rewrite_address_qualify(r->address, TRUE);
3788 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3790 if (recipients_count == 0 && !blackholed_by)
3791 blackholed_by = US"local_scan";
3794 /* Message rejected: newlines permitted in local_scan_data to generate
3795 multiline SMTP responses. */
3799 uschar *istemp = US"";
3803 errmsg = local_scan_data;
3805 Uunlink(spool_name); /* Cancel this message */
3809 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3810 "rejection given", rc);
3813 case LOCAL_SCAN_REJECT_NOLOGHDR:
3814 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3817 case LOCAL_SCAN_REJECT:
3818 smtp_code = US"550";
3819 if (!errmsg) errmsg = US"Administrative prohibition";
3822 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3823 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3826 case LOCAL_SCAN_TEMPREJECT:
3828 smtp_code = US"451";
3829 if (!errmsg) errmsg = US"Temporary local problem";
3830 istemp = US"temporarily ";
3834 g = string_append(NULL, 2, US"F=",
3835 sender_address[0] == 0 ? US"<>" : sender_address);
3836 g = add_host_info_for_log(g);
3838 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3839 string_from_gstring(g), istemp, string_printing(errmsg));
3842 if (!smtp_batched_input)
3844 smtp_respond(smtp_code, 3, TRUE, errmsg);
3845 message_id[0] = 0; /* Indicate no message accepted */
3846 smtp_reply = US""; /* Indicate reply already sent */
3847 goto TIDYUP; /* Skip to end of function */
3850 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3851 /* Does not return */
3854 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3855 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3856 US"message rejected by local scan code: ", error_rc, spool_data_file,
3858 /* Does not return */
3862 /* Reset signal handlers to ignore signals that previously would have caused
3863 the message to be abandoned. */
3865 signal(SIGTERM, SIG_IGN);
3866 signal(SIGINT, SIG_IGN);
3867 #endif /* HAVE_LOCAL_SCAN */
3870 /* Ensure the first time flag is set in the newly-received message. */
3872 f.deliver_firsttime = TRUE;
3874 #ifdef EXPERIMENTAL_BRIGHTMAIL
3876 { /* rewind data file */
3877 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3878 bmi_verdicts = bmi_process_message(header_list, data_fd);
3882 /* Update the timestamp in our Received: header to account for any time taken by
3883 an ACL or by local_scan(). The new time is the time that all reception
3884 processing is complete. */
3886 timestamp = expand_string(US"${tod_full}");
3887 tslen = Ustrlen(timestamp);
3889 memcpy(received_header->text + received_header->slen - tslen - 1,
3892 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3896 f.deliver_freeze = FALSE;
3897 f.queue_only_policy = FALSE;
3900 /* Keep the data file open until we have written the header file, in order to
3901 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3902 don't write the header file, and we unlink the data file. If writing the header
3903 file fails, we have failed to accept this message. */
3905 if (host_checking || blackholed_by)
3907 Uunlink(spool_name);
3908 msg_size = 0; /* Compute size for log line */
3909 for (header_line * h = header_list; h; h = h->next)
3910 if (h->type != '*') msg_size += h->slen;
3913 /* Write the -H file */
3916 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3918 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3919 Uunlink(spool_name); /* Lose the data file */
3923 smtp_reply = US"451 Error in writing spool file";
3924 message_id[0] = 0; /* Indicate no message accepted */
3929 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3930 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3932 /* Does not return */
3937 /* The message has now been successfully received. */
3939 receive_messagecount++;
3941 /* Add data size to written header size. We do not count the initial file name
3942 that is in the file, but we do add one extra for the notional blank line that
3943 precedes the data. This total differs from message_size in that it include the
3944 added Received: header and any other headers that got created locally. */
3946 if (fflush(spool_data_file))
3948 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3949 log_write(0, LOG_MAIN, "%s\n", errmsg);
3950 Uunlink(spool_name); /* Lose the data file */
3954 smtp_reply = US"451 Error in writing spool file";
3955 message_id[0] = 0; /* Indicate no message accepted */
3960 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3961 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3963 /* Does not return */
3966 fstat(data_fd, &statbuf);
3968 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3970 /* Generate a "message received" log entry. We do this by building up a dynamic
3971 string as required. We log the arrival of a new message while the
3972 file is still locked, just in case the machine is *really* fast, and delivers
3973 it first! Include any message id that is in the message - since the syntax of a
3974 message id is actually an addr-spec, we can use the parse routine to canonicalize
3977 rcvd_log_reset_point = store_mark();
3978 g = string_get(256);
3980 g = string_append(g, 2,
3981 fake_response == FAIL ? US"(= " : US"<= ",
3982 sender_address[0] == 0 ? US"<>" : sender_address);
3983 if (message_reference)
3984 g = string_append(g, 2, US" R=", message_reference);
3986 g = add_host_info_for_log(g);
3989 if (LOGGING(tls_cipher) && tls_in.cipher)
3991 g = string_append(g, 2, US" X=", tls_in.cipher);
3992 # ifdef EXPERIMENTAL_TLS_RESUME
3993 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
3994 g = string_catn(g, US"*", 1);
3997 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3998 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3999 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4000 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4001 if (LOGGING(tls_sni) && tls_in.sni)
4002 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
4005 if (sender_host_authenticated)
4007 g = string_append(g, 2, US" A=", sender_host_authenticated);
4008 if (authenticated_id)
4010 g = string_append(g, 2, US":", authenticated_id);
4011 if (LOGGING(smtp_mailauth) && authenticated_sender)
4012 g = string_append(g, 2, US":", authenticated_sender);
4016 #ifndef DISABLE_PRDR
4018 g = string_catn(g, US" PRDR", 5);
4021 #ifdef SUPPORT_PROXY
4022 if (proxy_session && LOGGING(proxy))
4023 g = string_append(g, 2, US" PRX=", proxy_local_address);
4026 if (chunking_state > CHUNKING_OFFERED)
4027 g = string_catn(g, US" K", 2);
4029 g = string_fmt_append(g, " S=%d", msg_size);
4031 /* log 8BITMIME mode announced in MAIL_FROM
4035 if (LOGGING(8bitmime))
4036 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4038 #ifndef DISABLE_DKIM
4039 if (LOGGING(dkim) && dkim_verify_overall)
4040 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4041 # ifdef EXPERIMENTAL_ARC
4042 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4043 g = string_catn(g, US" ARC", 4);
4047 if (LOGGING(receive_time))
4048 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
4051 g = string_append(g, 2, US" Q=", queue_name);
4053 /* If an addr-spec in a message-id contains a quoted string, it can contain
4054 any characters except " \ and CR and so in particular it can contain NL!
4055 Therefore, make sure we use a printing-characters only version for the log.
4056 Also, allow for domain literals in the message id. */
4058 if ( LOGGING(msg_id) && msgid_header
4059 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4063 BOOL save_allow_domain_literals = allow_domain_literals;
4064 allow_domain_literals = TRUE;
4065 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4066 &errmsg, &start, &end, &domain, FALSE);
4067 allow_domain_literals = save_allow_domain_literals;
4069 g = string_append(g, 2,
4070 msgid_header_newly_created ? US" id*=" : US" id=",
4071 string_printing(old_id));
4074 /* If subject logging is turned on, create suitable printing-character
4075 text. By expanding $h_subject: we make use of the MIME decoding. */
4077 if (LOGGING(subject) && subject_header)
4079 uschar *p = big_buffer;
4080 uschar *ss = expand_string(US"$h_subject:");
4082 /* Backslash-quote any double quotes or backslashes so as to make a
4083 a C-like string, and turn any non-printers into escape sequences. */
4086 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4088 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4093 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4096 /* Terminate the string: string_cat() and string_append() leave room, but do
4097 not put the zero in. */
4099 (void) string_from_gstring(g);
4101 /* Create a message log file if message logs are being used and this message is
4102 not blackholed. Write the reception stuff to it. We used to leave message log
4103 creation until the first delivery, but this has proved confusing for some
4106 if (message_logs && !blackholed_by)
4109 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4111 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4115 (void)directory_make(spool_directory,
4116 spool_sname(US"msglog", message_subdir),
4117 MSGLOG_DIRECTORY_MODE, TRUE);
4118 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4122 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4123 m_name, strerror(errno));
4126 FILE *message_log = fdopen(fd, "a");
4129 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4130 m_name, strerror(errno));
4135 uschar *now = tod_stamp(tod_log);
4136 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4137 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4139 if (f.queue_only_policy) fprintf(message_log,
4140 "%s no immediate delivery: queued%s%s by %s\n", now,
4141 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4143 (void)fclose(message_log);
4148 /* Everything has now been done for a successful message except logging its
4149 arrival, and outputting an SMTP response. While writing to the log, set a flag
4150 to cause a call to receive_bomb_out() if the log cannot be opened. */
4152 f.receive_call_bombout = TRUE;
4154 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4155 connection has gone away. This can only be done if there is no unconsumed input
4156 waiting in the local input buffer. We can test for this by calling
4157 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4158 input to be sent following the final dot, so the presence of following input is
4161 If the connection is still present, but there is no unread input for the
4162 socket, the result of a select() call will be zero. If, however, the connection
4163 has gone away, or if there is pending input, the result of select() will be
4164 non-zero. The two cases can be distinguished by trying to read the next input
4165 character. If we succeed, we can unread it so that it remains in the local
4166 buffer for handling later. If not, the connection has been lost.
4168 Of course, since TCP/IP is asynchronous, there is always a chance that the
4169 connection will vanish between the time of this test and the sending of the
4170 response, but the chance of this happening should be small. */
4172 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4173 !receive_smtp_buffered())
4176 fd_set select_check;
4177 FD_ZERO(&select_check);
4178 FD_SET(fileno(smtp_in), &select_check);
4182 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4184 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4185 if (c != EOF) (receive_ungetc)(c); else
4187 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4188 smtp_reply = US""; /* No attempt to send a response */
4189 smtp_yield = FALSE; /* Nothing more on this connection */
4191 /* Re-use the log line workspace */
4194 g = string_cat(g, US"SMTP connection lost after final dot");
4195 g = add_host_info_for_log(g);
4196 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4198 /* Delete the files for this aborted message. */
4200 Uunlink(spool_name);
4201 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4202 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4209 /* The connection has not gone away; we really are going to take responsibility
4210 for this message. */
4212 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4215 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4216 the sender's dot (below).
4217 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4218 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4219 in which case pass temp-reject back to initiator and dump the files.
4221 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4223 XXX We do not handle queue-only, freezing, or blackholes.
4225 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4227 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4228 /* Logging was done in finaldot() */
4231 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4232 cutthrough_done = ACCEPTED;
4233 break; /* message_id needed for SMTP accept below */
4235 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4236 ... for which, pass back the exact error */
4237 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4238 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4239 break; /* message_id needed for SMTP accept below */
4241 default: /* Unknown response, or error. Treat as temp-reject. */
4242 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4243 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4244 break; /* message_id needed for SMTP accept below */
4246 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4247 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4248 cutthrough_done = PERM_REJ;
4253 #ifndef DISABLE_PRDR
4254 if(!smtp_reply || prdr_requested)
4259 log_write(0, LOG_MAIN |
4260 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4261 (LOGGING(received_sender) ? LOG_SENDER : 0),
4264 /* Log any control actions taken by an ACL or local_scan(). */
4266 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4267 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4268 "no immediate delivery: queued%s%s by %s",
4269 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4272 f.receive_call_bombout = FALSE;
4274 /* The store for the main log message can be reused */
4275 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4277 /* If the message is frozen, and freeze_tell is set, do the telling. */
4279 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4280 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4281 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4282 message_id, frozen_by, sender_address);
4285 /* Either a message has been successfully received and written to the two spool
4286 files, or an error in writing the spool has occurred for an SMTP message, or
4287 an SMTP message has been rejected for policy reasons, or a message was passed on
4288 by cutthrough delivery. (For a non-SMTP message we will have already given up
4289 because there's no point in carrying on!) For non-cutthrough we must now close
4290 (and thereby unlock) the data file. In the successful case, this leaves the
4291 message on the spool, ready for delivery. In the error case, the spool file will
4292 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4295 For cutthrough we hold the data file locked until we have deleted it, otherwise
4296 a queue-runner could grab it in the window.
4298 A fflush() was done earlier in the expectation that any write errors on the
4299 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4300 possible for fclose() to fail - but what to do? What has happened to the lock
4301 if this happens? We can at least log it; if it is observed on some platform
4302 then we can think about properly declaring the message not-received. */
4306 /* In SMTP sessions we may receive several messages in one connection. After
4307 each one, we wait for the clock to tick at the level of message-id granularity.
4308 This is so that the combination of time+pid is unique, even on systems where the
4309 pid can be re-used within our time interval. We can't shorten the interval
4310 without re-designing the message-id. See comments above where the message id is
4311 created. This is Something For The Future.
4312 Do this wait any time we have created a message-id, even if we rejected the
4313 message. This gives unique IDs for logging done by ACLs. */
4315 if (id_resolution != 0)
4317 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
4318 exim_wait_tick(&message_id_tv, id_resolution);
4323 process_info[process_info_len] = 0; /* Remove message id */
4324 if (spool_data_file && cutthrough_done == NOT_TRIED)
4326 if (fclose(spool_data_file)) /* Frees the lock */
4327 log_write(0, LOG_MAIN|LOG_PANIC,
4328 "spoolfile error on close: %s", strerror(errno));
4329 spool_data_file = NULL;
4332 /* Now reset signal handlers to their defaults */
4334 signal(SIGTERM, SIG_DFL);
4335 signal(SIGINT, SIG_DFL);
4337 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4338 value, which defaults TRUE - meaning there may be more incoming messages from
4339 this connection. For non-SMTP callers (where there is only ever one message),
4340 the default is FALSE. */
4346 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4347 is set to the response that should be sent. When it is NULL, we generate
4348 default responses. After an ACL error or local_scan() error, the response has
4349 already been sent, and smtp_reply is an empty string to indicate this. */
4351 if (!smtp_batched_input)
4355 if (fake_response != OK)
4356 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4357 3, TRUE, fake_response_text);
4359 /* An OK response is required; use "message" text if present. */
4363 uschar *code = US"250";
4365 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4366 smtp_respond(code, len, TRUE, user_msg);
4369 /* Default OK response */
4371 else if (chunking_state > CHUNKING_OFFERED)
4373 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4374 chunking_datasize, message_size+message_linecount, message_id);
4375 chunking_state = CHUNKING_OFFERED;
4378 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4382 "\n**** SMTP testing: that is not a real message id!\n\n");
4385 /* smtp_reply is set non-empty */
4387 else if (smtp_reply[0] != 0)
4388 if (fake_response != OK && smtp_reply[0] == '2')
4389 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4390 fake_response_text);
4392 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4394 switch (cutthrough_done)
4397 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4399 /* Delete spool files */
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""));
4406 if (cutthrough.defer_pass)
4408 Uunlink(spool_name);
4409 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4410 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4415 if (cutthrough_done != NOT_TRIED)
4417 if (spool_data_file)
4419 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4420 spool_data_file = NULL;
4422 message_id[0] = 0; /* Prevent a delivery from starting */
4423 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4424 cutthrough.defer_pass = FALSE;
4428 /* For batched SMTP, generate an error message on failure, and do
4429 nothing on success. The function moan_smtp_batch() does not return -
4430 it exits from the program with a non-zero return code. */
4432 else if (smtp_reply)
4433 moan_smtp_batch(NULL, "%s", smtp_reply);
4437 /* If blackholing, we can immediately log this message's sad fate. The data
4438 file has already been unlinked, and the header file was never written to disk.
4439 We must now indicate that nothing was received, to prevent a delivery from
4444 const uschar *detail =
4445 #ifdef HAVE_LOCAL_SCAN
4446 local_scan_data ? string_printing(local_scan_data) :
4448 string_sprintf("(%s discarded recipients)", blackholed_by);
4449 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4450 log_write(0, LOG_MAIN, "Completed");
4454 /* Reset headers so that logging of rejects for a subsequent message doesn't
4455 include them. It is also important to set header_last = NULL before exiting
4456 from this function, as this prevents certain rewrites that might happen during
4457 subsequent verifying (of another incoming message) from trying to add headers
4458 when they shouldn't. */
4460 header_list = header_last = NULL;
4462 return yield; /* TRUE if more messages (SMTP only) */
4465 /* End of receive.c */