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
17 #ifdef EXPERIMENTAL_DMARC
19 #endif /* EXPERIMENTAL_DMARC */
21 /*************************************************
22 * Local static variables *
23 *************************************************/
25 static FILE *data_file = NULL;
26 static int data_fd = -1;
27 static uschar *spool_name = US"";
29 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
31 #ifdef HAVE_LOCAL_SCAN
32 jmp_buf local_scan_env; /* error-handling context for local_scan */
33 unsigned had_local_scan_crash;
34 unsigned had_local_scan_timeout;
38 /*************************************************
39 * Non-SMTP character reading functions *
40 *************************************************/
42 /* These are the default functions that are set up in the variables such as
43 receive_getc initially. They just call the standard functions, passing stdin as
44 the file. (When SMTP input is occurring, different functions are used by
45 changing the pointer variables.) */
48 stdin_getc(unsigned lim)
54 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
55 log_write(L_lost_incoming_connection,
56 LOG_MAIN, "timed out while reading local message");
57 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
61 if (filter_test == FTEST_NONE)
63 fprintf(stderr, "\nexim: %s received - message abandoned\n",
64 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
65 log_write(0, LOG_MAIN, "%s received while reading local message",
66 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
68 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
76 return ungetc(c, stdin);
94 /*************************************************
95 * Check that a set sender is allowed *
96 *************************************************/
98 /* This function is called when a local caller sets an explicit sender address.
99 It checks whether this is permitted, which it is for trusted callers.
100 Otherwise, it must match the pattern(s) in untrusted_set_sender.
102 Arguments: the proposed sender address
103 Returns: TRUE for a trusted caller
104 TRUE if the address has been set, untrusted_set_sender has been
105 set, and the address matches something in the list
110 receive_check_set_sender(uschar *newsender)
113 if (trusted_caller) return TRUE;
114 if (!newsender || !untrusted_set_sender) return FALSE;
115 qnewsender = Ustrchr(newsender, '@')
116 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
117 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
123 /*************************************************
124 * Read space info for a partition *
125 *************************************************/
127 /* This function is called by receive_check_fs() below, and also by string
128 expansion for variables such as $spool_space. The field names for the statvfs
129 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
130 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
131 have inodes, and they return -1 for the number available.
133 Later: It turns out that some file systems that do not have the concept of
134 inodes return 0 rather than -1. Such systems should also return 0 for the total
135 number of inodes, so we require that to be greater than zero before returning
139 isspool TRUE for spool partition, FALSE for log partition
140 inodeptr address of int to receive inode count; -1 if there isn't one
142 Returns: available on-root space, in kilobytes
143 -1 for log partition if there isn't one
145 All values are -1 if the STATFS functions are not available.
149 receive_statvfs(BOOL isspool, int *inodeptr)
152 struct STATVFS statbuf;
158 /* The spool directory must always exist. */
162 path = spool_directory;
166 /* Need to cut down the log file path to the directory, and to ignore any
167 appearance of "syslog" in it. */
171 int sep = ':'; /* Not variable - outside scripts use */
172 const uschar *p = log_file_path;
175 /* An empty log_file_path means "use the default". This is the same as an
176 empty item in a list. */
178 if (*p == 0) p = US":";
179 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
180 if (Ustrcmp(path, "syslog") != 0)
183 if (path == NULL) /* No log files */
189 /* An empty string means use the default, which is in the spool directory.
190 But don't just use the spool directory, as it is possible that the log
191 subdirectory has been symbolically linked elsewhere. */
195 sprintf(CS buffer, CS"%s/log", CS spool_directory);
201 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
205 /* We now have the path; do the business */
207 memset(&statbuf, 0, sizeof(statbuf));
209 if (STATVFS(CS path, &statbuf) != 0)
210 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
211 { /* Can happen on first run after installation */
217 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
218 "%s directory %s: %s", name, path, strerror(errno));
219 smtp_closedown(US"spool or log directory problem");
220 exim_exit(EXIT_FAILURE, NULL);
223 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
225 /* Disks are getting huge. Take care with computing the size in kilobytes. */
227 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
230 /* Unable to find partition sizes in this environment. */
240 /*************************************************
241 * Check space on spool and log partitions *
242 *************************************************/
244 /* This function is called before accepting a message; if any thresholds are
245 set, it checks them. If a message_size is supplied, it checks that there is
246 enough space for that size plus the threshold - i.e. that the message won't
247 reduce the space to the threshold. Not all OS have statvfs(); for those that
248 don't, this function always returns TRUE. For some OS the old function and
249 struct name statfs is used; that is handled by a macro, defined in exim.h.
252 msg_size the (estimated) size of an incoming message
254 Returns: FALSE if there isn't enough space, or if the information cannot
256 TRUE if no check was done or there is enough space
260 receive_check_fs(int msg_size)
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 = %dK inodes = %d "
270 "check_space = %dK 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=%d "
277 "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 = %dK inodes = %d "
288 "check_space = %dK 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=%d "
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(data_file);
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));
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)
558 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
560 for (count = 0; count < recipients_count; count++)
562 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
564 if ((--recipients_count - count) > 0)
565 memmove(recipients_list + count, recipients_list + count + 1,
566 (recipients_count - count)*sizeof(recipient_item));
577 /*************************************************
578 * Read data portion of a non-SMTP message *
579 *************************************************/
581 /* This function is called to read the remainder of a message (following the
582 header) when the input is not from SMTP - we are receiving a local message on
583 a standard input stream. The message is always terminated by EOF, and is also
584 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
585 two cases for maximum efficiency.
587 Ensure that the body ends with a newline. This will naturally be the case when
588 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
589 as "sequences of lines" - this of course strictly applies only to SMTP, but
590 deliveries into BSD-type mailbox files also require it. Exim used to have a
591 flag for doing this at delivery time, but as it was always set for all
592 transports, I decided to simplify things by putting the check here instead.
594 There is at least one MUA (dtmail) that sends CRLF via this interface, and
595 other programs are known to do this as well. Exim used to have a option for
596 dealing with this: in July 2003, after much discussion, the code has been
597 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
599 However, for the case when a dot on a line by itself terminates a message, the
600 only recognized terminating sequences before and after the dot are LF and CRLF.
601 Otherwise, having read EOL . CR, you don't know whether to read another
604 Internally, in messages stored in Exim's spool files, LF is used as the line
605 terminator. Under the new regime, bare CRs will no longer appear in these
609 fout a FILE to which to write the message
611 Returns: One of the END_xxx values indicating why it stopped reading
615 read_message_data(FILE *fout)
619 register int linelength = 0;
621 /* Handle the case when only EOF terminates the message */
625 register int last_ch = '\n';
627 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
629 if (ch == 0) body_zerocount++;
630 if (last_ch == '\r' && ch != '\n')
632 if (linelength > max_received_linelength)
633 max_received_linelength = linelength;
635 if (fputc('\n', fout) == EOF) return END_WERROR;
639 if (ch == '\r') continue;
641 if (fputc(ch, fout) == EOF) return END_WERROR;
644 if (linelength > max_received_linelength)
645 max_received_linelength = linelength;
650 if (++message_size > thismessage_size_limit) return END_SIZE;
655 if (linelength > max_received_linelength)
656 max_received_linelength = linelength;
657 if (fputc('\n', fout) == EOF) return END_WERROR;
665 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
669 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
671 if (ch == 0) body_zerocount++;
674 case 0: /* Normal state (previous char written) */
678 if (linelength > max_received_linelength)
679 max_received_linelength = linelength;
684 { ch_state = 2; continue; }
687 case 1: /* After written "\n" */
688 if (ch == '.') { ch_state = 3; continue; }
689 if (ch == '\r') { ch_state = 2; continue; }
690 if (ch == '\n') { body_linecount++; linelength = -1; }
695 body_linecount++; /* After unwritten "\r" */
696 if (linelength > max_received_linelength)
697 max_received_linelength = linelength;
705 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
706 if (ch == '\r') continue;
712 case 3: /* After "\n." (\n written, dot not) */
713 if (ch == '\n') return END_DOT;
714 if (ch == '\r') { ch_state = 4; continue; }
717 if (fputc('.', fout) == EOF) return END_WERROR;
721 case 4: /* After "\n.\r" (\n written, rest not) */
722 if (ch == '\n') return END_DOT;
725 if (fputs(".\n", fout) == EOF) return END_WERROR;
726 if (ch == '\r') { ch_state = 2; continue; }
732 if (fputc(ch, fout) == EOF) return END_WERROR;
733 if (++message_size > thismessage_size_limit) return END_SIZE;
736 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
737 the message ends with a newline, and we must also write any characters that
738 were saved up while testing for an ending dot. */
742 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
743 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
744 message_size += Ustrlen(ends[ch_state]);
754 /*************************************************
755 * Read data portion of an SMTP message *
756 *************************************************/
758 /* This function is called to read the remainder of an SMTP message (after the
759 headers), or to skip over it when an error has occurred. In this case, the
760 output file is passed as NULL.
762 If any line begins with a dot, that character is skipped. The input should only
763 be successfully terminated by CR LF . CR LF unless it is local (non-network)
764 SMTP, in which case the CRs are optional, but...
766 FUDGE: It seems that sites on the net send out messages with just LF
767 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
768 we make the CRs optional in all cases.
770 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
771 well, so that there are no CRs in spooled messages. However, the message
772 terminating dot is not recognized between two bare CRs.
775 fout a FILE to which to write the message; NULL if skipping
777 Returns: One of the END_xxx values indicating why it stopped reading
781 read_message_data_smtp(FILE *fout)
787 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
789 if (ch == 0) body_zerocount++;
792 case 0: /* After LF or CRLF */
796 continue; /* Don't ever write . after LF */
800 /* Else fall through to handle as normal uschar. */
802 case 1: /* Normal state */
807 if (linelength > max_received_linelength)
808 max_received_linelength = linelength;
818 case 2: /* After (unwritten) CR */
820 if (linelength > max_received_linelength)
821 max_received_linelength = linelength;
830 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
831 cutthrough_data_put_nl();
832 if (ch != '\r') ch_state = 1; else continue;
836 case 3: /* After [CR] LF . */
844 /* The dot was removed at state 3. For a doubled dot, here, reinstate
845 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
846 and to file below. */
850 cutthrough_data_puts(&c, 1);
855 case 4: /* After [CR] LF . CR */
856 if (ch == '\n') return END_DOT;
859 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
860 cutthrough_data_put_nl();
870 /* Add the character to the spool file, unless skipping; then loop for the
877 if (fputc(ch, fout) == EOF) return END_WERROR;
878 if (message_size > thismessage_size_limit) return END_SIZE;
881 cutthrough_data_put_nl();
885 cutthrough_data_puts(&c, 1);
889 /* Fall through here if EOF encountered. This indicates some kind of error,
890 since a correct message is terminated by [CR] LF . [CR] LF. */
898 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
899 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
900 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
901 body_linecount accounting for proper re-expansion for the wire, so use
902 a cut-down version of the state-machine above; we don't need to do leading-dot
903 detection and unstuffing.
906 fout a FILE to which to write the message; NULL if skipping;
907 must be open for both writing and reading.
909 Returns: One of the END_xxx values indicating why it stopped reading
913 read_message_bdat_smtp(FILE *fout)
915 int linelength = 0, ch;
916 enum CH_STATE ch_state = LF_SEEN;
921 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
923 case EOF: return END_EOF;
924 case ERR: return END_PROTOCOL;
926 /* Nothing to get from the sender anymore. We check the last
927 character written to the spool.
929 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
930 If we would be strict, we would refuse such broken messages.
931 But we are liberal, so we fix it. It would be easy just to append
932 the "\n" to the spool.
934 But there are some more things (line counting, message size calculation and such),
935 that would need to be duplicated here. So we simply do some ungetc
940 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
941 if (fgetc(fout) == '\n') return END_DOT;
944 if (linelength == -1) /* \r already seen (see below) */
946 DEBUG(D_receive) debug_printf("Add missing LF\n");
950 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
951 bdat_ungetc('\r'); /* not even \r was seen */
955 case '\0': body_zerocount++; break;
959 case LF_SEEN: /* After LF or CRLF */
961 /* fall through to handle as normal uschar. */
963 case MID_LINE: /* Mid-line state */
968 if (linelength > max_received_linelength)
969 max_received_linelength = linelength;
975 if (fix_nl) bdat_ungetc('\n');
976 continue; /* don't write CR */
980 case CR_SEEN: /* After (unwritten) CR */
982 if (linelength > max_received_linelength)
983 max_received_linelength = linelength;
990 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
991 cutthrough_data_put_nl();
992 if (ch == '\r') continue; /* don't write CR */
998 /* Add the character to the spool file, unless skipping */
1004 if (fputc(ch, fout) == EOF) return END_WERROR;
1005 if (message_size > thismessage_size_limit) return END_SIZE;
1008 cutthrough_data_put_nl();
1012 cutthrough_data_puts(&c, 1);
1019 read_message_bdat_smtp_wire(FILE *fout)
1023 /* Remember that this message uses wireformat. */
1025 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1026 fout ? "writing spoolfile in wire format" : "flushing input");
1027 spool_file_wireformat = TRUE;
1031 if (chunking_data_left > 0)
1033 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1034 uschar * buf = bdat_getbuf(&len);
1036 if (!buf) return END_EOF;
1037 message_size += len;
1038 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1040 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1042 case EOF: return END_EOF;
1043 case EOD: return END_DOT;
1044 case ERR: return END_PROTOCOL;
1050 max_received_linelength
1054 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1057 if (message_size > thismessage_size_limit) return END_SIZE;
1065 /*************************************************
1066 * Swallow SMTP message *
1067 *************************************************/
1069 /* This function is called when there has been some kind of error while reading
1070 an SMTP message, and the remaining data may need to be swallowed. It is global
1071 because it is called from smtp_closedown() to shut down an incoming call
1074 Argument: a FILE from which to read the message
1079 receive_swallow_smtp(void)
1081 if (message_ended >= END_NOTENDED)
1082 message_ended = chunking_state <= CHUNKING_OFFERED
1083 ? read_message_data_smtp(NULL)
1084 : read_message_bdat_smtp_wire(NULL);
1089 /*************************************************
1090 * Handle lost SMTP connection *
1091 *************************************************/
1093 /* This function logs connection loss incidents and generates an appropriate
1096 Argument: additional data for the message
1097 Returns: the SMTP response
1101 handle_lost_connection(uschar *s)
1103 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1104 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1105 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1106 return US"421 Lost incoming connection";
1112 /*************************************************
1113 * Handle a non-smtp reception error *
1114 *************************************************/
1116 /* This function is called for various errors during the reception of non-SMTP
1117 messages. It either sends a message to the sender of the problem message, or it
1118 writes to the standard error stream.
1121 errcode code for moan_to_sender(), identifying the error
1122 text1 first message text, passed to moan_to_sender()
1123 text2 second message text, used only for stderrr
1124 error_rc code to pass to exim_exit if no problem
1125 f FILE containing body of message (may be stdin)
1126 hptr pointer to instore headers or NULL
1128 Returns: calls exim_exit(), which does not return
1132 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1133 FILE *f, header_line *hptr)
1135 if (error_handling == ERRORS_SENDER)
1139 eblock.text1 = text1;
1140 eblock.text2 = US"";
1141 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1142 error_rc = EXIT_FAILURE;
1145 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1147 exim_exit(error_rc, US"");
1152 /*************************************************
1153 * Add header lines set up by ACL *
1154 *************************************************/
1156 /* This function is called to add the header lines that were set up by
1157 statements in an ACL to the list of headers in memory. It is done in two stages
1158 like this, because when the ACL for RCPT is running, the other headers have not
1159 yet been received. This function is called twice; once just before running the
1160 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1161 are visible to the DATA ACL.
1163 Originally these header lines were added at the end. Now there is support for
1164 three different places: top, bottom, and after the Received: header(s). There
1165 will always be at least one Received: header, even if it is marked deleted, and
1166 even if something else has been put in front of it.
1169 acl_name text to identify which ACL
1175 add_acl_headers(int where, uschar *acl_name)
1177 header_line *h, *next;
1178 header_line *last_received = NULL;
1182 case ACL_WHERE_DKIM:
1183 case ACL_WHERE_MIME:
1184 case ACL_WHERE_DATA:
1185 if ( cutthrough.fd >= 0 && cutthrough.delivery
1186 && (acl_removed_headers || acl_added_headers))
1188 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1189 " will not take effect on cutthrough deliveries");
1194 if (acl_removed_headers)
1196 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1198 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1200 const uschar * list = acl_removed_headers;
1201 int sep = ':'; /* This is specified as a colon-separated list */
1205 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1206 if (header_testname(h, s, Ustrlen(s), FALSE))
1208 h->type = htype_old;
1209 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1212 acl_removed_headers = NULL;
1213 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1216 if (!acl_added_headers) return;
1217 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1219 for (h = acl_added_headers; h; h = next)
1226 h->next = header_list;
1228 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1234 last_received = header_list;
1235 while (!header_testname(last_received, US"Received", 8, FALSE))
1236 last_received = last_received->next;
1237 while (last_received->next &&
1238 header_testname(last_received->next, US"Received", 8, FALSE))
1239 last_received = last_received->next;
1241 h->next = last_received->next;
1242 last_received->next = h;
1243 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1247 /* add header before any header which is NOT Received: or Resent- */
1248 last_received = header_list;
1249 while ( last_received->next &&
1250 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1251 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1252 last_received = last_received->next;
1253 /* last_received now points to the last Received: or Resent-* header
1254 in an uninterrupted chain of those header types (seen from the beginning
1255 of all headers. Our current header must follow it. */
1256 h->next = last_received->next;
1257 last_received->next = h;
1258 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1263 header_last->next = h;
1264 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1268 if (!h->next) header_last = h;
1270 /* Check for one of the known header types (From:, To:, etc.) though in
1271 practice most added headers are going to be "other". Lower case
1272 identification letters are never stored with the header; they are used
1273 for existence tests when messages are received. So discard any lower case
1276 h->type = header_checkname(h, FALSE);
1277 if (h->type >= 'a') h->type = htype_other;
1279 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1282 acl_added_headers = NULL;
1283 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1288 /*************************************************
1289 * Add host information for log line *
1290 *************************************************/
1292 /* Called for acceptance and rejecting log lines. This adds information about
1293 the calling host to a string that is being built dynamically.
1296 s the dynamic string
1298 Returns: the extended string
1302 add_host_info_for_log(gstring * g)
1304 if (sender_fullhost)
1306 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1307 g = string_catn(g, US" DS", 3);
1308 g = string_append(g, 2, US" H=", sender_fullhost);
1309 if (LOGGING(incoming_interface) && interface_address != NULL)
1312 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1315 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1317 g = string_catn(g, US" TFO", 4);
1318 tcp_in_fastopen_logged = TRUE;
1321 g = string_append(g, 2, US" U=", sender_ident);
1322 if (received_protocol)
1323 g = string_append(g, 2, US" P=", received_protocol);
1329 #ifdef WITH_CONTENT_SCAN
1331 /*************************************************
1332 * Run the MIME ACL on a message *
1333 *************************************************/
1335 /* This code is in a subroutine so that it can be used for both SMTP
1336 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1339 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1340 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1341 smtp_reply_ptr Where SMTP reply is being built
1342 blackholed_by_ptr Where "blackholed by" message is being built
1344 Returns: TRUE to carry on; FALSE to abandon the message
1348 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1349 uschar **blackholed_by_ptr)
1352 uschar * rfc822_file_path = NULL;
1353 unsigned long mbox_size;
1354 header_line *my_headerlist;
1355 uschar *user_msg, *log_msg;
1356 int mime_part_count_buffer = -1;
1357 uschar * mbox_filename;
1360 /* check if it is a MIME message */
1362 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1363 if ( my_headerlist->type != '*' /* skip deleted headers */
1364 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1367 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1371 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1376 /* make sure the eml mbox file is spooled up */
1377 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1378 { /* error while spooling */
1379 log_write(0, LOG_MAIN|LOG_PANIC,
1380 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1381 Uunlink(spool_name);
1383 #ifdef EXPERIMENTAL_DCC
1386 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1387 message_id[0] = 0; /* Indicate no message accepted */
1388 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1389 return FALSE; /* Indicate skip to end of receive function */
1395 mime_part_count = -1;
1396 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1397 (void)fclose(mbox_file);
1399 if (rfc822_file_path)
1401 mime_part_count = mime_part_count_buffer;
1403 if (unlink(CS rfc822_file_path) == -1)
1405 log_write(0, LOG_PANIC,
1406 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1409 rfc822_file_path = NULL;
1412 /* check if we must check any message/rfc822 attachments */
1415 uschar * scandir = string_copyn(mbox_filename,
1416 Ustrrchr(mbox_filename, '/') - mbox_filename);
1417 struct dirent * entry;
1420 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1421 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1423 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1425 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1431 if (rfc822_file_path)
1433 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1435 /* set RFC822 expansion variable */
1437 mime_part_count_buffer = mime_part_count;
1438 goto MIME_ACL_CHECK;
1440 log_write(0, LOG_PANIC,
1441 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1442 unlink(CS rfc822_file_path);
1447 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1450 recipients_count = 0;
1451 *blackholed_by_ptr = US"MIME ACL";
1455 Uunlink(spool_name);
1457 #ifdef EXPERIMENTAL_DCC
1462 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1463 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1464 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1466 message_id[0] = 0; /* Indicate no message accepted */
1467 return FALSE; /* Cause skip to end of receive function */
1473 #endif /* WITH_CONTENT_SCAN */
1478 received_header_gen(void)
1482 header_line *received_header= header_list;
1484 timestamp = expand_string(US"${tod_full}");
1485 if (recipients_count == 1) received_for = recipients_list[0].address;
1486 received = expand_string(received_header_text);
1487 received_for = NULL;
1491 if(spool_name[0] != 0)
1492 Uunlink(spool_name); /* Lose the data file */
1493 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1494 "(received_header_text) failed: %s", string_printing(received_header_text),
1495 expand_string_message);
1498 /* The first element on the header chain is reserved for the Received header,
1499 so all we have to do is fill in the text pointer, and set the type. However, if
1500 the result of the expansion is an empty string, we leave the header marked as
1501 "old" so as to refrain from adding a Received header. */
1503 if (received[0] == 0)
1505 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1506 received_header->type = htype_old;
1510 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1511 received_header->type = htype_received;
1514 received_header->slen = Ustrlen(received_header->text);
1516 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1517 received_header->type, received_header->text);
1522 /*************************************************
1524 *************************************************/
1526 /* Receive a message on the given input, and put it into a pair of spool files.
1527 Either a non-null list of recipients, or the extract flag will be true, or
1528 both. The flag sender_local is true for locally generated messages. The flag
1529 submission_mode is true if an ACL has obeyed "control = submission". The flag
1530 suppress_local_fixups is true if an ACL has obeyed "control =
1531 suppress_local_fixups" or -G was passed on the command-line.
1532 The flag smtp_input is true if the message is to be
1533 handled using SMTP conventions about termination and lines starting with dots.
1534 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1536 If a message was successfully read, message_id[0] will be non-zero.
1538 The general actions of this function are:
1540 . Read the headers of the message (if any) into a chain of store
1543 . If there is a "sender:" header and the message is locally originated,
1544 throw it away, unless the caller is trusted, or unless
1545 active_local_sender_retain is set - which can only happen if
1546 active_local_from_check is false.
1548 . If recipients are to be extracted from the message, build the
1549 recipients list from the headers, removing any that were on the
1550 original recipients list (unless extract_addresses_remove_arguments is
1551 false), and at the same time, remove any bcc header that may be present.
1553 . Get the spool file for the data, sort out its unique name, open
1554 and lock it (but don't give it the name yet).
1556 . Generate a "Message-Id" header if the message doesn't have one, for
1557 locally-originated messages.
1559 . Generate a "Received" header.
1561 . Ensure the recipients list is fully qualified and rewritten if necessary.
1563 . If there are any rewriting rules, apply them to the sender address
1564 and also to the headers.
1566 . If there is no from: header, generate one, for locally-generated messages
1567 and messages in "submission mode" only.
1569 . If the sender is local, check that from: is correct, and if not, generate
1570 a Sender: header, unless message comes from a trusted caller, or this
1571 feature is disabled by active_local_from_check being false.
1573 . If there is no "date" header, generate one, for locally-originated
1574 or submission mode messages only.
1576 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1577 dot_ends mode, to the data file. Leave it open, to hold the lock.
1579 . Write the envelope and the headers to a new file.
1581 . Set the name for the header file; close it.
1583 . Set the name for the data file; close it.
1585 Because this function can potentially be called many times in a single
1586 SMTP connection, all store should be got by store_get(), so that it will be
1587 automatically retrieved after the message is accepted.
1589 FUDGE: It seems that sites on the net send out messages with just LF
1590 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1591 we make the CRs optional in all cases.
1593 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1594 new regime is now in place in which bare CRs in header lines are turned into LF
1595 followed by a space, so as not to terminate the header line.
1597 February 2004: A bare LF in a header line in a message whose first line was
1598 terminated by CRLF is treated in the same way as a bare CR.
1601 extract_recip TRUE if recipients are to be extracted from the message's
1604 Returns: TRUE there are more messages to be read (SMTP input)
1605 FALSE there are no more messages to be read (non-SMTP input
1606 or SMTP connection collapsed, or other failure)
1608 When reading a message for filter testing, the returned value indicates
1609 whether the headers (which is all that is read) were terminated by '.' or
1613 receive_msg(BOOL extract_recip)
1618 int process_info_len = Ustrlen(process_info);
1619 int error_rc = error_handling == ERRORS_SENDER
1620 ? errors_sender_rc : EXIT_FAILURE;
1621 int header_size = 256;
1622 int start, end, domain;
1625 int prevlines_length = 0;
1627 register int ptr = 0;
1629 BOOL contains_resent_headers = FALSE;
1630 BOOL extracted_ignored = FALSE;
1631 BOOL first_line_ended_crlf = TRUE_UNSET;
1632 BOOL smtp_yield = TRUE;
1635 BOOL resents_exist = FALSE;
1636 uschar *resent_prefix = US"";
1637 uschar *blackholed_by = NULL;
1638 uschar *blackhole_log_msg = US"";
1639 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1642 error_block *bad_addresses = NULL;
1644 uschar *frozen_by = NULL;
1645 uschar *queued_by = NULL;
1649 struct stat statbuf;
1651 /* Final message to give to SMTP caller, and messages from ACLs */
1653 uschar *smtp_reply = NULL;
1654 uschar *user_msg, *log_msg;
1656 /* Working header pointers */
1658 header_line *h, *next;
1660 /* Flags for noting the existence of certain headers (only one left) */
1662 BOOL date_header_exists = FALSE;
1664 /* Pointers to receive the addresses of headers whose contents we need. */
1666 header_line *from_header = NULL;
1667 header_line *subject_header = NULL;
1668 header_line *msgid_header = NULL;
1669 header_line *received_header;
1671 #ifdef EXPERIMENTAL_DMARC
1673 #endif /* EXPERIMENTAL_DMARC */
1675 /* Variables for use when building the Received: header. */
1681 /* Release any open files that might have been cached while preparing to
1682 accept the message - e.g. by verifying addresses - because reading a message
1683 might take a fair bit of real time. */
1687 /* Extracting the recipient list from an input file is incompatible with
1688 cutthrough delivery with the no-spool option. It shouldn't be possible
1689 to set up the combination, but just in case kill any ongoing connection. */
1690 if (extract_recip || !smtp_input)
1691 cancel_cutthrough_connection(TRUE, US"not smtp input");
1693 /* Initialize the chain of headers by setting up a place-holder for Received:
1694 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1695 pointing to the end of the chain to make adding headers simple. */
1697 received_header = header_list = header_last = store_get(sizeof(header_line));
1698 header_list->next = NULL;
1699 header_list->type = htype_old;
1700 header_list->text = NULL;
1701 header_list->slen = 0;
1703 /* Control block for the next header to be read. */
1705 next = store_get(sizeof(header_line));
1706 next->text = store_get(header_size);
1708 /* Initialize message id to be null (indicating no message read), and the
1709 header names list to be the normal list. Indicate there is no data file open
1710 yet, initialize the size and warning count, and deal with no size limit. */
1718 received_count = 1; /* For the one we will add */
1720 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1722 /* While reading the message, the following counts are computed. */
1724 message_linecount = body_linecount = body_zerocount =
1725 max_received_linelength = 0;
1727 #ifndef DISABLE_DKIM
1728 /* Call into DKIM to set up the context. In CHUNKING mode
1729 we clear the dot-stuffing flag */
1730 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1731 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1734 #ifdef EXPERIMENTAL_DMARC
1735 /* initialize libopendmarc */
1736 dmarc_up = dmarc_init();
1739 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1740 ids, and fractions of a second are required. See the comments that precede the
1741 message id creation below. */
1743 (void)gettimeofday(&message_id_tv, NULL);
1745 /* For other uses of the received time we can operate with granularity of one
1746 second, and for that we use the global variable received_time. This is for
1747 things like ultimate message timeouts. */
1749 received_time = message_id_tv;
1751 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1752 happen in the smtp_getc() function when it refills its buffer. */
1754 had_data_timeout = 0;
1756 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1758 /* If not SMTP input, timeout happens only if configured, and we just set a
1759 single timeout for the whole message. */
1761 else if (receive_timeout > 0)
1763 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1764 alarm(receive_timeout);
1767 /* SIGTERM and SIGINT are caught always. */
1769 had_data_sigint = 0;
1770 signal(SIGTERM, data_sigterm_sigint_handler);
1771 signal(SIGINT, data_sigterm_sigint_handler);
1773 /* Header lines in messages are not supposed to be very long, though when
1774 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1775 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1776 storing the header, and extend this as necessary using string_cat().
1778 To cope with total lunacies, impose an upper limit on the length of the header
1779 section of the message, as otherwise the store will fill up. We must also cope
1780 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1781 Folded header lines are joined into one string, leaving the '\n' characters
1782 inside them, so that writing them out reproduces the input.
1784 Loop for each character of each header; the next structure for chaining the
1785 header is set up already, with ptr the offset of the next character in
1790 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1792 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1793 SMTP must have a correct "." terminator. */
1795 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1797 smtp_reply = handle_lost_connection(US" (header)");
1799 goto TIDYUP; /* Skip to end of function */
1802 /* See if we are at the current header's size limit - there must be at least
1803 four bytes left. This allows for the new character plus a zero, plus two for
1804 extra insertions when we are playing games with dots and carriage returns. If
1805 we are at the limit, extend the text buffer. This could have been done
1806 automatically using string_cat() but because this is a tightish loop storing
1807 only one character at a time, we choose to do it inline. Normally
1808 store_extend() will be able to extend the block; only at the end of a big
1809 store block will a copy be needed. To handle the case of very long headers
1810 (and sometimes lunatic messages can have ones that are 100s of K long) we
1811 call store_release() for strings that have been copied - if the string is at
1812 the start of a block (and therefore the only thing in it, because we aren't
1813 doing any other gets), the block gets freed. We can only do this release if
1814 there were no allocations since the once that we want to free. */
1816 if (ptr >= header_size - 4)
1818 int oldsize = header_size;
1819 /* header_size += 256; */
1821 if (!store_extend(next->text, oldsize, header_size))
1822 next->text = store_newblock(next->text, header_size, ptr);
1825 /* Cope with receiving a binary zero. There is dispute about whether
1826 these should be allowed in RFC 822 messages. The middle view is that they
1827 should not be allowed in headers, at least. Exim takes this attitude at
1828 the moment. We can't just stomp on them here, because we don't know that
1829 this line is a header yet. Set a flag to cause scanning later. */
1831 if (ch == 0) had_zero++;
1833 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1834 those from data files use just LF. Treat LF in local SMTP input as a
1835 terminator too. Treat EOF as a line terminator always. */
1837 if (ch == EOF) goto EOL;
1839 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1840 other MTAs accept this. We are therefore forced into this "liberalisation"
1841 too, so we accept LF as a line terminator whatever the source of the message.
1842 However, if the first line of the message ended with a CRLF, we treat a bare
1843 LF specially by inserting a white space after it to ensure that the header
1844 line is not terminated. */
1848 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1849 else if (first_line_ended_crlf) receive_ungetc(' ');
1853 /* This is not the end of the line. If this is SMTP input and this is
1854 the first character in the line and it is a "." character, ignore it.
1855 This implements the dot-doubling rule, though header lines starting with
1856 dots aren't exactly common. They are legal in RFC 822, though. If the
1857 following is CRLF or LF, this is the line that that terminates the
1858 entire message. We set message_ended to indicate this has happened (to
1859 prevent further reading), and break out of the loop, having freed the
1860 empty header, and set next = NULL to indicate no data line. */
1862 if (ptr == 0 && ch == '.' && dot_ends)
1864 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1867 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1871 ch = '\r'; /* Revert to CR */
1876 message_ended = END_DOT;
1879 break; /* End character-reading loop */
1882 /* For non-SMTP input, the dot at the start of the line was really a data
1883 character. What is now in ch is the following character. We guaranteed
1884 enough space for this above. */
1888 next->text[ptr++] = '.';
1893 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1894 remember this case if this is the first line ending. */
1898 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1901 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1905 /* Otherwise, put back the character after CR, and turn the bare CR
1908 ch = (receive_ungetc)(ch);
1909 next->text[ptr++] = '\n';
1914 /* We have a data character for the header line. */
1916 next->text[ptr++] = ch; /* Add to buffer */
1917 message_size++; /* Total message size so far */
1919 /* Handle failure due to a humungously long header section. The >= allows
1920 for the terminating \n. Add what we have so far onto the headers list so
1921 that it gets reflected in any error message, and back up the just-read
1924 if (message_size >= header_maxsize)
1926 next->text[ptr] = 0;
1928 next->type = htype_other;
1930 header_last->next = next;
1933 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1934 "%s (more than %d characters): message abandoned",
1935 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1939 smtp_reply = US"552 Message header is ridiculously long";
1940 receive_swallow_smtp();
1941 goto TIDYUP; /* Skip to end of function */
1946 give_local_error(ERRMESS_VLONGHEADER,
1947 string_sprintf("message header longer than %d characters received: "
1948 "message not accepted", header_maxsize), US"", error_rc, stdin,
1950 /* Does not return */
1954 continue; /* With next input character */
1956 /* End of header line reached */
1960 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1962 receive_linecount++;
1963 message_linecount++;
1965 /* Keep track of maximum line length */
1967 if (ptr - prevlines_length > max_received_linelength)
1968 max_received_linelength = ptr - prevlines_length;
1969 prevlines_length = ptr + 1;
1971 /* Now put in the terminating newline. There is always space for
1972 at least two more characters. */
1974 next->text[ptr++] = '\n';
1977 /* A blank line signals the end of the headers; release the unwanted
1978 space and set next to NULL to indicate this. */
1987 /* There is data in the line; see if the next input character is a
1988 whitespace character. If it is, we have a continuation of this header line.
1989 There is always space for at least one character at this point. */
1993 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1994 if (nextch == ' ' || nextch == '\t')
1996 next->text[ptr++] = nextch;
1998 continue; /* Iterate the loop */
2000 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2001 else ch = EOF; /* Cause main loop to exit at end */
2004 /* We have got to the real line end. Terminate the string and release store
2005 beyond it. If it turns out to be a real header, internal binary zeros will
2006 be squashed later. */
2008 next->text[ptr] = 0;
2010 store_reset(next->text + ptr + 1);
2012 /* Check the running total size against the overall message size limit. We
2013 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2014 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2015 headers - the code to read the body will then also hit the buffer. */
2017 if (message_size > thismessage_size_limit) break;
2019 /* A line that is not syntactically correct for a header also marks
2020 the end of the headers. In this case, we leave next containing the
2021 first data line. This might actually be several lines because of the
2022 continuation logic applied above, but that doesn't matter.
2024 It turns out that smail, and presumably sendmail, accept leading lines
2027 From ph10 Fri Jan 5 12:35 GMT 1996
2029 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2030 find any documentation of this, but for compatibility it had better be
2031 accepted. Exim restricts it to the case of non-smtp messages, and
2032 treats it as an alternative to the -f command line option. Thus it is
2033 ignored except for trusted users or filter testing. Otherwise it is taken
2034 as the sender address, unless -f was used (sendmail compatibility).
2036 It further turns out that some UUCPs generate the From_line in a different
2039 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2041 The regex for matching these things is now capable of recognizing both
2042 formats (including 2- and 4-digit years in the latter). In fact, the regex
2043 is now configurable, as is the expansion string to fish out the sender.
2045 Even further on it has been discovered that some broken clients send
2046 these lines in SMTP messages. There is now an option to ignore them from
2047 specified hosts or networks. Sigh. */
2049 if ( header_last == header_list
2051 || ( sender_host_address
2052 && verify_check_host(&ignore_fromline_hosts) == OK
2054 || (!sender_host_address && ignore_fromline_local)
2056 && regex_match_and_setup(regex_From, next->text, 0, -1)
2059 if (!sender_address_forced)
2061 uschar *uucp_sender = expand_string(uucp_from_sender);
2063 log_write(0, LOG_MAIN|LOG_PANIC,
2064 "expansion of \"%s\" failed after matching "
2065 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2068 int start, end, domain;
2070 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2071 &start, &end, &domain, TRUE);
2074 if (domain == 0 && newsender[0] != 0)
2075 newsender = rewrite_address_qualify(newsender, FALSE);
2077 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2079 sender_address = newsender;
2081 if (trusted_caller || filter_test != FTEST_NONE)
2083 authenticated_sender = NULL;
2084 originator_name = US"";
2085 sender_local = FALSE;
2088 if (filter_test != FTEST_NONE)
2089 printf("Sender taken from \"From \" line\n");
2096 /* Not a leading "From " line. Check to see if it is a valid header line.
2097 Header names may contain any non-control characters except space and colon,
2102 uschar *p = next->text;
2104 /* If not a valid header line, break from the header reading loop, leaving
2105 next != NULL, indicating that it holds the first line of the body. */
2107 if (isspace(*p)) break;
2108 while (mac_isgraph(*p) && *p != ':') p++;
2109 while (isspace(*p)) p++;
2112 body_zerocount = had_zero;
2116 /* We have a valid header line. If there were any binary zeroes in
2117 the line, stomp on them here. */
2120 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2122 /* It is perfectly legal to have an empty continuation line
2123 at the end of a header, but it is confusing to humans
2124 looking at such messages, since it looks like a blank line.
2125 Reduce confusion by removing redundant white space at the
2126 end. We know that there is at least one printing character
2127 (the ':' tested for above) so there is no danger of running
2130 p = next->text + ptr - 2;
2133 while (*p == ' ' || *p == '\t') p--;
2134 if (*p != '\n') break;
2135 ptr = (p--) - next->text + 1;
2136 message_size -= next->slen - ptr;
2137 next->text[ptr] = 0;
2141 /* Add the header to the chain */
2143 next->type = htype_other;
2145 header_last->next = next;
2148 /* Check the limit for individual line lengths. This comes after adding to
2149 the chain so that the failing line is reflected if a bounce is generated
2150 (for a local message). */
2152 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2154 log_write(0, LOG_MAIN, "overlong message header line received from "
2155 "%s (more than %d characters): message abandoned",
2156 sender_host_unknown? sender_ident : sender_fullhost,
2157 header_line_maxsize);
2161 smtp_reply = US"552 A message header line is too long";
2162 receive_swallow_smtp();
2163 goto TIDYUP; /* Skip to end of function */
2167 give_local_error(ERRMESS_VLONGHDRLINE,
2168 string_sprintf("message header line longer than %d characters "
2169 "received: message not accepted", header_line_maxsize), US"",
2170 error_rc, stdin, header_list->next);
2171 /* Does not return */
2174 /* Note if any resent- fields exist. */
2176 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2178 resents_exist = TRUE;
2179 resent_prefix = US"Resent-";
2183 /* Reject CHUNKING messages that do not CRLF their first header line */
2185 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2187 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2188 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2190 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2191 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2192 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2195 goto TIDYUP; /* Skip to end of function */
2198 /* The line has been handled. If we have hit EOF, break out of the loop,
2199 indicating no pending data line. */
2201 if (ch == EOF) { next = NULL; break; }
2203 /* Set up for the next header */
2206 next = store_get(sizeof(header_line));
2207 next->text = store_get(header_size);
2210 prevlines_length = 0;
2211 } /* Continue, starting to read the next header */
2213 /* At this point, we have read all the headers into a data structure in main
2214 store. The first header is still the dummy placeholder for the Received: header
2215 we are going to generate a bit later on. If next != NULL, it contains the first
2216 data line - which terminated the headers before reaching a blank line (not the
2221 debug_printf(">>Headers received:\n");
2222 for (h = header_list->next; h; h = h->next)
2223 debug_printf("%s", h->text);
2227 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2228 is dropped immediately after valid headers, the next thing we will see is EOF.
2229 We must test for this specially, as further down the reading of the data is
2230 skipped if already at EOF. */
2232 if (smtp_input && (receive_feof)())
2234 smtp_reply = handle_lost_connection(US" (after header)");
2236 goto TIDYUP; /* Skip to end of function */
2239 /* If this is a filter test run and no headers were read, output a warning
2240 in case there is a mistake in the test message. */
2242 if (filter_test != FTEST_NONE && header_list->next == NULL)
2243 printf("Warning: no message headers read\n");
2246 /* Scan the headers to identify them. Some are merely marked for later
2247 processing; some are dealt with here. */
2249 for (h = header_list->next; h; h = h->next)
2251 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2252 if (is_resent) contains_resent_headers = TRUE;
2254 switch (header_checkname(h, is_resent))
2257 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2261 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2264 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2267 if (!resents_exist || is_resent) date_header_exists = TRUE;
2270 /* Same comments as about Return-Path: below. */
2272 case htype_delivery_date:
2273 if (delivery_date_remove) h->type = htype_old;
2276 /* Same comments as about Return-Path: below. */
2278 case htype_envelope_to:
2279 if (envelope_to_remove) h->type = htype_old;
2282 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2283 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2284 header consists of just the login id of the user who called Exim, rewrite
2285 it with the gecos field first. Apply this rule to Resent-From: if there
2286 are resent- fields. */
2289 h->type = htype_from;
2290 if (!resents_exist || is_resent)
2296 uschar *s = Ustrchr(h->text, ':') + 1;
2297 while (isspace(*s)) s++;
2298 len = h->slen - (s - h->text) - 1;
2299 if (Ustrlen(originator_login) == len &&
2300 strncmpic(s, originator_login, len) == 0)
2302 uschar *name = is_resent? US"Resent-From" : US"From";
2303 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2304 originator_login, qualify_domain_sender);
2305 from_header = header_last;
2306 h->type = htype_old;
2307 DEBUG(D_receive|D_rewrite)
2308 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2314 /* Identify the Message-id: header for generating "in-reply-to" in the
2315 autoreply transport. For incoming logging, save any resent- value. In both
2316 cases, take just the first of any multiples. */
2319 if (!msgid_header && (!resents_exist || is_resent))
2326 /* Flag all Received: headers */
2328 case htype_received:
2329 h->type = htype_received;
2333 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2335 case htype_reply_to:
2336 h->type = htype_reply_to;
2339 /* The Return-path: header is supposed to be added to messages when
2340 they leave the SMTP system. We shouldn't receive messages that already
2341 contain Return-path. However, since Exim generates Return-path: on
2342 local delivery, resent messages may well contain it. We therefore
2343 provide an option (which defaults on) to remove any Return-path: headers
2344 on input. Removal actually means flagging as "old", which prevents the
2345 header being transmitted with the message. */
2347 case htype_return_path:
2348 if (return_path_remove) h->type = htype_old;
2350 /* If we are testing a mail filter file, use the value of the
2351 Return-Path: header to set up the return_path variable, which is not
2352 otherwise set. However, remove any <> that surround the address
2353 because the variable doesn't have these. */
2355 if (filter_test != FTEST_NONE)
2357 uschar *start = h->text + 12;
2358 uschar *end = start + Ustrlen(start);
2359 while (isspace(*start)) start++;
2360 while (end > start && isspace(end[-1])) end--;
2361 if (*start == '<' && end[-1] == '>')
2366 return_path = string_copyn(start, end - start);
2367 printf("Return-path taken from \"Return-path:\" header line\n");
2371 /* If there is a "Sender:" header and the message is locally originated,
2372 and from an untrusted caller and suppress_local_fixups is not set, or if we
2373 are in submission mode for a remote message, mark it "old" so that it will
2374 not be transmitted with the message, unless active_local_sender_retain is
2375 set. (This can only be true if active_local_from_check is false.) If there
2376 are any resent- headers in the message, apply this rule to Resent-Sender:
2377 instead of Sender:. Messages with multiple resent- header sets cannot be
2378 tidily handled. (For this reason, at least one MUA - Pine - turns old
2379 resent- headers into X-resent- headers when resending, leaving just one
2383 h->type = !active_local_sender_retain
2384 && ( sender_local && !trusted_caller && !suppress_local_fixups
2387 && (!resents_exist || is_resent)
2388 ? htype_old : htype_sender;
2391 /* Remember the Subject: header for logging. There is no Resent-Subject */
2397 /* "To:" gets flagged, and the existence of a recipient header is noted,
2398 whether it's resent- or not. */
2403 to_or_cc_header_exists = TRUE;
2409 /* Extract recipients from the headers if that is required (the -t option).
2410 Note that this is documented as being done *before* any address rewriting takes
2411 place. There are two possibilities:
2413 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2414 recipients already listed are to be REMOVED from the message. Smail 3 works
2415 like this. We need to build a non-recipients tree for that list, because in
2416 subsequent processing this data is held in a tree and that's what the
2417 spool_write_header() function expects. Make sure that non-recipient addresses
2418 are fully qualified and rewritten if necessary.
2420 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2421 those in the command line arguments (and it is rumoured some other MTAs do
2422 this). Therefore, there is an option to make Exim behave this way.
2424 *** Notes on "Resent-" header lines ***
2426 The presence of resent-headers in the message makes -t horribly ambiguous.
2427 Experiments with sendmail showed that it uses recipients for all resent-
2428 headers, totally ignoring the concept of "sets of resent- headers" as described
2429 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2430 with all the addresses in one instance of each header.
2432 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2433 error for -t if there were resent- headers in the message. However, after a
2434 discussion on the mailing list, I've learned that there are MUAs that use
2435 resent- headers with -t, and also that the stuff about sets of resent- headers
2436 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2437 message with -t and resent- header lines makes sure that only *its* resent-
2438 headers are present; previous ones are often renamed as X-resent- for example.
2440 Consequently, Exim has been changed so that, if any resent- header lines are
2441 present, the recipients are taken from all of the appropriate resent- lines,
2442 and not from the ordinary To:, Cc:, etc. */
2447 error_block **bnext = &bad_addresses;
2449 if (extract_addresses_remove_arguments)
2451 while (recipients_count-- > 0)
2453 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2454 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2455 tree_add_nonrecipient(s);
2457 recipients_list = NULL;
2458 recipients_count = recipients_list_max = 0;
2461 /* Now scan the headers */
2463 for (h = header_list->next; h; h = h->next)
2465 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2466 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2468 uschar *s = Ustrchr(h->text, ':') + 1;
2469 while (isspace(*s)) s++;
2471 parse_allow_group = TRUE; /* Allow address group syntax */
2475 uschar *ss = parse_find_address_end(s, FALSE);
2476 uschar *recipient, *errmess, *p, *pp;
2477 int start, end, domain;
2479 /* Check on maximum */
2481 if (recipients_max > 0 && ++rcount > recipients_max)
2483 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2484 US"message rejected: ", error_rc, stdin, NULL);
2485 /* Does not return */
2488 /* Make a copy of the address, and remove any internal newlines. These
2489 may be present as a result of continuations of the header line. The
2490 white space that follows the newline must not be removed - it is part
2493 pp = recipient = store_get(ss - s + 1);
2494 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2499 BOOL b = allow_utf8_domains;
2500 allow_utf8_domains = TRUE;
2502 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2506 if (string_is_utf8(recipient))
2507 message_smtputf8 = TRUE;
2509 allow_utf8_domains = b;
2513 /* Keep a list of all the bad addresses so we can send a single
2514 error message at the end. However, an empty address is not an error;
2515 just ignore it. This can come from an empty group list like
2517 To: Recipients of list:;
2519 If there are no recipients at all, an error will occur later. */
2521 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2523 int len = Ustrlen(s);
2524 error_block *b = store_get(sizeof(error_block));
2525 while (len > 0 && isspace(s[len-1])) len--;
2527 b->text1 = string_printing(string_copyn(s, len));
2533 /* If the recipient is already in the nonrecipients tree, it must
2534 have appeared on the command line with the option extract_addresses_
2535 remove_arguments set. Do not add it to the recipients, and keep a note
2536 that this has happened, in order to give a better error if there are
2537 no recipients left. */
2539 else if (recipient != NULL)
2541 if (tree_search(tree_nonrecipients, recipient) == NULL)
2542 receive_add_recipient(recipient, -1);
2544 extracted_ignored = TRUE;
2547 /* Move on past this address */
2549 s = ss + (*ss? 1:0);
2550 while (isspace(*s)) s++;
2551 } /* Next address */
2553 parse_allow_group = FALSE; /* Reset group syntax flags */
2554 parse_found_group = FALSE;
2556 /* If this was the bcc: header, mark it "old", which means it
2557 will be kept on the spool, but not transmitted as part of the
2560 if (h->type == htype_bcc) h->type = htype_old;
2561 } /* For appropriate header line */
2562 } /* For each header line */
2566 /* Now build the unique message id. This has changed several times over the
2567 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2568 Retaining all the history in the comment has become too unwieldy - read
2569 previous release sources if you want it.
2571 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2572 The first part is the current time, in seconds. The second part is the current
2573 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2574 can hold a number in the range 0-3843. It used to be a computed sequence
2575 number, but is now the fractional component of the current time in units of
2576 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2577 received, Exim ensures that the timer has ticked at the appropriate level
2578 before proceeding, to avoid duplication if the pid happened to be re-used
2579 within the same time period. It seems likely that most messages will take at
2580 least half a millisecond to be received, so no delay will normally be
2581 necessary. At least for some time...
2583 There is a modification when localhost_number is set. Formerly this was allowed
2584 to be as large as 255. Now it is restricted to the range 0-16, and the final
2585 component of the message id becomes (localhost_number * 200) + fractional time
2586 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2588 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2589 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2590 still allows the tttttt field to hold a large enough number to last for some
2591 more decades, and the final two-digit field can hold numbers up to 1295, which
2592 is enough for milliseconds (instead of 1/2000 of a second).
2594 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2595 pid, so it is probably safe because pids have to be positive. The
2596 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2597 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2599 Note that string_base62() returns its data in a static storage block, so it
2600 must be copied before calling string_base62() again. It always returns exactly
2603 There doesn't seem to be anything in the RFC which requires a message id to
2604 start with a letter, but Smail was changed to ensure this. The external form of
2605 the message id (as supplied by string expansion) therefore starts with an
2606 additional leading 'E'. The spool file names do not include this leading
2607 letter and it is not used internally.
2609 NOTE: If ever the format of message ids is changed, the regular expression for
2610 checking that a string is in this format must be updated in a corresponding
2611 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2612 must also be changed to reflect the correct string length. The queue-sort code
2613 needs to know the layout. Then, of course, other programs that rely on the
2614 message id format will need updating too. */
2616 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2617 message_id[6] = '-';
2618 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2620 /* Deal with the case where the host number is set. The value of the number was
2621 checked when it was read, to ensure it isn't too big. The timing granularity is
2622 left in id_resolution so that an appropriate wait can be done after receiving
2623 the message, if necessary (we hope it won't be). */
2625 if (host_number_string)
2627 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2628 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2629 string_base62((long int)(
2630 host_number * (1000000/id_resolution) +
2631 message_id_tv.tv_usec/id_resolution)) + 4);
2634 /* Host number not set: final field is just the fractional time at an
2635 appropriate resolution. */
2639 id_resolution = (BASE_62 == 62)? 500 : 1000;
2640 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2641 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2644 /* Add the current message id onto the current process info string if
2647 (void)string_format(process_info + process_info_len,
2648 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2650 /* If we are using multiple input directories, set up the one for this message
2651 to be the least significant base-62 digit of the time of arrival. Otherwise
2652 ensure that it is an empty string. */
2654 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2656 /* Now that we have the message-id, if there is no message-id: header, generate
2657 one, but only for local (without suppress_local_fixups) or submission mode
2658 messages. This can be user-configured if required, but we had better flatten
2659 any illegal characters therein. */
2662 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2665 uschar *id_text = US"";
2666 uschar *id_domain = primary_hostname;
2668 /* Permit only letters, digits, dots, and hyphens in the domain */
2670 if (message_id_domain)
2672 uschar *new_id_domain = expand_string(message_id_domain);
2675 if (!expand_string_forcedfail)
2676 log_write(0, LOG_MAIN|LOG_PANIC,
2677 "expansion of \"%s\" (message_id_header_domain) "
2678 "failed: %s", message_id_domain, expand_string_message);
2680 else if (*new_id_domain)
2682 id_domain = new_id_domain;
2683 for (p = id_domain; *p; p++)
2684 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2688 /* Permit all characters except controls and RFC 2822 specials in the
2689 additional text part. */
2691 if (message_id_text)
2693 uschar *new_id_text = expand_string(message_id_text);
2696 if (!expand_string_forcedfail)
2697 log_write(0, LOG_MAIN|LOG_PANIC,
2698 "expansion of \"%s\" (message_id_header_text) "
2699 "failed: %s", message_id_text, expand_string_message);
2701 else if (*new_id_text)
2703 id_text = new_id_text;
2704 for (p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2708 /* Add the header line
2709 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2710 * appended, to preserve classical expectations of header ordering. */
2712 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2713 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2714 (*id_text == 0)? "" : ".", id_text, id_domain);
2717 /* If we are to log recipients, keep a copy of the raw ones before any possible
2718 rewriting. Must copy the count, because later ACLs and the local_scan()
2719 function may mess with the real recipients. */
2721 if (LOGGING(received_recipients))
2723 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2724 for (i = 0; i < recipients_count; i++)
2725 raw_recipients[i] = string_copy(recipients_list[i].address);
2726 raw_recipients_count = recipients_count;
2729 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2730 recipients will get here only if the conditions were right (allow_unqualified_
2731 recipient is TRUE). */
2733 for (i = 0; i < recipients_count; i++)
2734 recipients_list[i].address =
2735 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2736 global_rewrite_rules, rewrite_existflags);
2738 /* If there is no From: header, generate one for local (without
2739 suppress_local_fixups) or submission_mode messages. If there is no sender
2740 address, but the sender is local or this is a local delivery error, use the
2741 originator login. This shouldn't happen for genuine bounces, but might happen
2742 for autoreplies. The addition of From: must be done *before* checking for the
2743 possible addition of a Sender: header, because untrusted_set_sender allows an
2744 untrusted user to set anything in the envelope (which might then get info
2745 From:) but we still want to ensure a valid Sender: if it is required. */
2748 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2750 uschar *oname = US"";
2752 /* Use the originator_name if this is a locally submitted message and the
2753 caller is not trusted. For trusted callers, use it only if -F was used to
2754 force its value or if we have a non-SMTP message for which -f was not used
2755 to set the sender. */
2757 if (!sender_host_address)
2759 if (!trusted_caller || sender_name_forced ||
2760 (!smtp_input && !sender_address_forced))
2761 oname = originator_name;
2764 /* For non-locally submitted messages, the only time we use the originator
2765 name is when it was forced by the /name= option on control=submission. */
2767 else if (submission_name) oname = submission_name;
2769 /* Envelope sender is empty */
2771 if (!*sender_address)
2773 uschar *fromstart, *fromend;
2775 fromstart = string_sprintf("%sFrom: %s%s",
2776 resent_prefix, oname, *oname ? " <" : "");
2777 fromend = *oname ? US">" : US"";
2779 if (sender_local || local_error_message)
2780 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2781 local_part_quote(originator_login), qualify_domain_sender,
2784 else if (submission_mode && authenticated_id)
2786 if (!submission_domain)
2787 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2788 local_part_quote(authenticated_id), qualify_domain_sender,
2791 else if (!*submission_domain) /* empty => whole address set */
2792 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2796 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2797 local_part_quote(authenticated_id), submission_domain, fromend);
2799 from_header = header_last; /* To get it checked for Sender: */
2803 /* There is a non-null envelope sender. Build the header using the original
2804 sender address, before any rewriting that might have been done while
2809 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2812 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2815 from_header = header_last; /* To get it checked for Sender: */
2820 /* If the sender is local (without suppress_local_fixups), or if we are in
2821 submission mode and there is an authenticated_id, check that an existing From:
2822 is correct, and if not, generate a Sender: header, unless disabled. Any
2823 previously-existing Sender: header was removed above. Note that sender_local,
2824 as well as being TRUE if the caller of exim is not trusted, is also true if a
2825 trusted caller did not supply a -f argument for non-smtp input. To allow
2826 trusted callers to forge From: without supplying -f, we have to test explicitly
2827 here. If the From: header contains more than one address, then the call to
2828 parse_extract_address fails, and a Sender: header is inserted, as required. */
2831 && ( active_local_from_check
2832 && ( sender_local && !trusted_caller && !suppress_local_fixups
2833 || submission_mode && authenticated_id
2836 BOOL make_sender = TRUE;
2837 int start, end, domain;
2839 uschar *from_address =
2840 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2841 &start, &end, &domain, FALSE);
2842 uschar *generated_sender_address;
2844 generated_sender_address = submission_mode
2845 ? !submission_domain
2846 ? string_sprintf("%s@%s",
2847 local_part_quote(authenticated_id), qualify_domain_sender)
2848 : !*submission_domain /* empty => full address */
2849 ? string_sprintf("%s", authenticated_id)
2850 : string_sprintf("%s@%s",
2851 local_part_quote(authenticated_id), submission_domain)
2852 : string_sprintf("%s@%s",
2853 local_part_quote(originator_login), qualify_domain_sender);
2855 /* Remove permitted prefixes and suffixes from the local part of the From:
2856 address before doing the comparison with the generated sender. */
2861 uschar *at = domain ? from_address + domain - 1 : NULL;
2864 from_address += route_check_prefix(from_address, local_from_prefix);
2865 slen = route_check_suffix(from_address, local_from_suffix);
2868 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2869 from_address += slen;
2873 if ( strcmpic(generated_sender_address, from_address) == 0
2874 || (!domain && strcmpic(from_address, originator_login) == 0))
2875 make_sender = FALSE;
2878 /* We have to cause the Sender header to be rewritten if there are
2879 appropriate rewriting rules. */
2882 if (submission_mode && !submission_name)
2883 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2884 generated_sender_address);
2886 header_add(htype_sender, "%sSender: %s <%s>\n",
2888 submission_mode? submission_name : originator_name,
2889 generated_sender_address);
2891 /* Ensure that a non-null envelope sender address corresponds to the
2892 submission mode sender address. */
2894 if (submission_mode && *sender_address)
2896 if (!sender_address_unrewritten)
2897 sender_address_unrewritten = sender_address;
2898 sender_address = generated_sender_address;
2899 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2900 log_write(L_address_rewrite, LOG_MAIN,
2901 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2902 sender_address_unrewritten, generated_sender_address);
2906 /* If there are any rewriting rules, apply them to the sender address, unless
2907 it has already been rewritten as part of verification for SMTP input. */
2909 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2911 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2912 global_rewrite_rules, rewrite_existflags);
2913 DEBUG(D_receive|D_rewrite)
2914 debug_printf("rewritten sender = %s\n", sender_address);
2918 /* The headers must be run through rewrite_header(), because it ensures that
2919 addresses are fully qualified, as well as applying any rewriting rules that may
2922 Qualification of header addresses in a message from a remote host happens only
2923 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2924 appropriate. For local messages, qualification always happens, unless -bnq is
2925 used to explicitly suppress it. No rewriting is done for an unqualified address
2926 that is left untouched.
2928 We start at the second header, skipping our own Received:. This rewriting is
2929 documented as happening *after* recipient addresses are taken from the headers
2930 by the -t command line option. An added Sender: gets rewritten here. */
2932 for (h = header_list->next; h; h = h->next)
2934 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2935 rewrite_existflags, TRUE);
2940 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2941 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2942 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2943 exists, this applies to the set of resent- headers rather than the normal set.
2945 The requirement for a recipient header has been removed in RFC 2822. At this
2946 point in the code, earlier versions of Exim added a To: header for locally
2947 submitted messages, and an empty Bcc: header for others. In the light of the
2948 changes in RFC 2822, this was dropped in November 2003. */
2951 /* If there is no date header, generate one if the message originates locally
2952 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2953 submission mode flag is set. Messages without Date: are not valid, but it seems
2954 to be more confusing if Exim adds one to all remotely-originated messages.
2955 As per Message-Id, we prepend if resending, else append.
2958 if ( !date_header_exists
2959 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2960 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2961 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2963 search_tidyup(); /* Free any cached resources */
2965 /* Show the complete set of headers if debugging. Note that the first one (the
2966 new Received:) has not yet been set. */
2970 debug_printf(">>Headers after rewriting and local additions:\n");
2971 for (h = header_list->next; h; h = h->next)
2972 debug_printf("%c %s", h->type, h->text);
2976 /* The headers are now complete in store. If we are running in filter
2977 testing mode, that is all this function does. Return TRUE if the message
2978 ended with a dot. */
2980 if (filter_test != FTEST_NONE)
2982 process_info[process_info_len] = 0;
2983 return message_ended == END_DOT;
2986 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2987 think more if it could be handled. Cannot do onward CHUNKING unless
2988 inbound is, but inbound chunking ought to be ok with outbound plain.
2989 Could we do onward CHUNKING given inbound CHUNKING?
2991 if (chunking_state > CHUNKING_OFFERED)
2992 cancel_cutthrough_connection(FALSE, US"chunking active");
2994 /* Cutthrough delivery:
2995 We have to create the Received header now rather than at the end of reception,
2996 so the timestamp behaviour is a change to the normal case.
2997 Having created it, send the headers to the destination. */
2999 if (cutthrough.fd >= 0 && cutthrough.delivery)
3001 if (received_count > received_headers_max)
3003 cancel_cutthrough_connection(TRUE, US"too many headers");
3004 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3005 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3006 "Too many \"Received\" headers",
3008 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3009 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3010 message_id[0] = 0; /* Indicate no message accepted */
3011 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3012 goto TIDYUP; /* Skip to end of function */
3014 received_header_gen();
3015 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3016 (void) cutthrough_headers_send();
3020 /* Open a new spool file for the data portion of the message. We need
3021 to access it both via a file descriptor and a stream. Try to make the
3022 directory if it isn't there. */
3024 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3025 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3027 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3029 if (errno == ENOENT)
3031 (void) directory_make(spool_directory,
3032 spool_sname(US"input", message_subdir),
3033 INPUT_DIRECTORY_MODE, TRUE);
3034 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3037 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3038 spool_name, strerror(errno));
3041 /* Make sure the file's group is the Exim gid, and double-check the mode
3042 because the group setting doesn't always get set automatically. */
3044 if (fchown(data_fd, exim_uid, exim_gid))
3045 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3046 "Failed setting ownership on spool file %s: %s",
3047 spool_name, strerror(errno));
3048 (void)fchmod(data_fd, SPOOL_MODE);
3050 /* We now have data file open. Build a stream for it and lock it. We lock only
3051 the first line of the file (containing the message ID) because otherwise there
3052 are problems when Exim is run under Cygwin (I'm told). See comments in
3053 spool_in.c, where the same locking is done. */
3055 data_file = fdopen(data_fd, "w+");
3056 lock_data.l_type = F_WRLCK;
3057 lock_data.l_whence = SEEK_SET;
3058 lock_data.l_start = 0;
3059 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3061 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3062 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3063 errno, strerror(errno));
3065 /* We have an open, locked data file. Write the message id to it to make it
3066 self-identifying. Then read the remainder of the input of this message and
3067 write it to the data file. If the variable next != NULL, it contains the first
3068 data line (which was read as a header but then turned out not to have the right
3069 format); write it (remembering that it might contain binary zeros). The result
3070 of fwrite() isn't inspected; instead we call ferror() below. */
3072 fprintf(data_file, "%s-D\n", message_id);
3075 uschar *s = next->text;
3076 int len = next->slen;
3077 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3078 body_linecount++; /* Assumes only 1 line */
3081 /* Note that we might already be at end of file, or the logical end of file
3082 (indicated by '.'), or might have encountered an error while writing the
3083 message id or "next" line. */
3085 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3089 message_ended = chunking_state <= CHUNKING_OFFERED
3090 ? read_message_data_smtp(data_file)
3092 ? read_message_bdat_smtp_wire(data_file)
3093 : read_message_bdat_smtp(data_file);
3094 receive_linecount++; /* The terminating "." line */
3096 else message_ended = read_message_data(data_file);
3098 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3099 message_linecount += body_linecount;
3101 switch (message_ended)
3103 /* Handle premature termination of SMTP */
3108 Uunlink(spool_name); /* Lose data file when closed */
3109 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3110 message_id[0] = 0; /* Indicate no message accepted */
3111 smtp_reply = handle_lost_connection(US"");
3113 goto TIDYUP; /* Skip to end of function */
3117 /* Handle message that is too big. Don't use host_or_ident() in the log
3118 message; we want to see the ident value even for non-remote messages. */
3121 Uunlink(spool_name); /* Lose the data file when closed */
3122 cancel_cutthrough_connection(TRUE, US"mail too big");
3123 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3125 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3126 "message too big: read=%d max=%d",
3128 sender_fullhost ? " H=" : "",
3129 sender_fullhost ? sender_fullhost : US"",
3130 sender_ident ? " U=" : "",
3131 sender_ident ? sender_ident : US"",
3133 thismessage_size_limit);
3137 smtp_reply = US"552 Message size exceeds maximum permitted";
3138 message_id[0] = 0; /* Indicate no message accepted */
3139 goto TIDYUP; /* Skip to end of function */
3143 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3144 give_local_error(ERRMESS_TOOBIG,
3145 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3146 US"message rejected: ", error_rc, data_file, header_list);
3147 /* Does not return */
3151 /* Handle bad BDAT protocol sequence */
3154 Uunlink(spool_name); /* Lose the data file when closed */
3155 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3156 smtp_reply = US""; /* Response already sent */
3157 message_id[0] = 0; /* Indicate no message accepted */
3158 goto TIDYUP; /* Skip to end of function */
3162 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3163 example, there may be some expansion in an ACL that uses a timer.) */
3165 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3167 /* The message body has now been read into the data file. Call fflush() to
3168 empty the buffers in C, and then call fsync() to get the data written out onto
3169 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3170 having to do this). If there was an I/O error on either input or output,
3171 attempt to send an error message, and unlink the spool file. For non-SMTP input
3172 we can then give up. Note that for SMTP input we must swallow the remainder of
3173 the input in cases of output errors, since the far end doesn't expect to see
3174 anything until the terminating dot line is sent. */
3176 if (fflush(data_file) == EOF || ferror(data_file) ||
3177 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3179 uschar *msg_errno = US strerror(errno);
3180 BOOL input_error = (receive_ferror)() != 0;
3181 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3182 input_error? "Input read" : "Spool write",
3184 sender_fullhost ? sender_fullhost : sender_ident);
3186 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3187 Uunlink(spool_name); /* Lose the data file */
3188 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3193 smtp_reply = US"451 Error while reading input data";
3196 smtp_reply = US"451 Error while writing spool file";
3197 receive_swallow_smtp();
3199 message_id[0] = 0; /* Indicate no message accepted */
3200 goto TIDYUP; /* Skip to end of function */
3205 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3206 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3208 /* Does not return */
3213 /* No I/O errors were encountered while writing the data file. */
3215 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3216 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3219 /* If there were any bad addresses extracted by -t, or there were no recipients
3220 left after -t, send a message to the sender of this message, or write it to
3221 stderr if the error handling option is set that way. Note that there may
3222 legitimately be no recipients for an SMTP message if they have all been removed
3225 We need to rewind the data file in order to read it. In the case of no
3226 recipients or stderr error writing, throw the data file away afterwards, and
3227 exit. (This can't be SMTP, which always ensures there's at least one
3228 syntactically good recipient address.) */
3230 if (extract_recip && (bad_addresses || recipients_count == 0))
3234 if (recipients_count == 0) debug_printf("*** No recipients\n");
3237 error_block *eblock = bad_addresses;
3238 debug_printf("*** Bad address(es)\n");
3239 while (eblock != NULL)
3241 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3242 eblock = eblock->next;
3247 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3249 /* If configured to send errors to the sender, but this fails, force
3250 a failure error code. We use a special one for no recipients so that it
3251 can be detected by the autoreply transport. Otherwise error_rc is set to
3252 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3253 it is EXIT_SUCCESS. */
3255 if (error_handling == ERRORS_SENDER)
3257 if (!moan_to_sender(
3258 (bad_addresses == NULL)?
3259 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3260 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3261 bad_addresses, header_list, data_file, FALSE))
3262 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3268 if (extracted_ignored)
3269 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3271 fprintf(stderr, "exim: no recipients in message\n");
3275 fprintf(stderr, "exim: invalid address%s",
3276 (bad_addresses->next == NULL)? ":" : "es:\n");
3277 while (bad_addresses != NULL)
3279 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3280 bad_addresses->text2);
3281 bad_addresses = bad_addresses->next;
3286 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3288 Uunlink(spool_name);
3289 (void)fclose(data_file);
3290 exim_exit(error_rc, US"receiving");
3294 /* Data file successfully written. Generate text for the Received: header by
3295 expanding the configured string, and adding a timestamp. By leaving this
3296 operation till now, we ensure that the timestamp is the time that message
3297 reception was completed. However, this is deliberately done before calling the
3298 data ACL and local_scan().
3300 This Received: header may therefore be inspected by the data ACL and by code in
3301 the local_scan() function. When they have run, we update the timestamp to be
3302 the final time of reception.
3304 If there is just one recipient, set up its value in the $received_for variable
3305 for use when we generate the Received: header.
3307 Note: the checking for too many Received: headers is handled by the delivery
3309 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3311 if (!received_header->text) /* Non-cutthrough case */
3313 received_header_gen();
3315 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3317 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3318 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3320 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3321 now, before running the DATA ACL. */
3323 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3326 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3327 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3329 /* If an ACL is specified for checking things at this stage of reception of a
3330 message, run it, unless all the recipients were removed by "discard" in earlier
3331 ACLs. That is the only case in which recipients_count can be zero at this
3332 stage. Set deliver_datafile to point to the data file so that $message_body and
3333 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3336 deliver_datafile = data_fd;
3339 enable_dollar_recipients = TRUE;
3341 if (recipients_count == 0)
3342 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3346 /* Handle interactive SMTP messages */
3348 if (smtp_input && !smtp_batched_input)
3351 #ifndef DISABLE_DKIM
3352 if (!dkim_disable_verify)
3354 /* Finish verification */
3355 dkim_exim_verify_finish();
3357 /* Check if we must run the DKIM ACL */
3358 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3360 uschar * dkim_verify_signers_expanded =
3361 expand_string(dkim_verify_signers);
3362 gstring * results = NULL;
3366 gstring * seen_items = NULL;
3367 int old_pool = store_pool;
3369 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3371 if (!(ptr = dkim_verify_signers_expanded))
3372 log_write(0, LOG_MAIN|LOG_PANIC,
3373 "expansion of dkim_verify_signers option failed: %s",
3374 expand_string_message);
3376 /* Default to OK when no items are present */
3378 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3380 /* Prevent running ACL for an empty item */
3381 if (!item || !*item) continue;
3383 /* Only run ACL once for each domain or identity,
3384 no matter how often it appears in the expanded list. */
3388 const uschar * seen_items_list = string_from_gstring(seen_items);
3390 BOOL seen_this_item = FALSE;
3392 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3394 if (Ustrcmp(seen_item,item) == 0)
3396 seen_this_item = TRUE;
3403 debug_printf("acl_smtp_dkim: skipping signer %s, "
3404 "already seen\n", item);
3408 seen_items = string_catn(seen_items, US":", 1);
3410 seen_items = string_cat(seen_items, item);
3412 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3416 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3417 "skipping remaining items\n", rc, item);
3418 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3422 dkim_verify_status = string_from_gstring(results);
3423 store_pool = old_pool;
3424 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3427 recipients_count = 0;
3428 blackholed_by = US"DKIM ACL";
3430 blackhole_log_msg = string_sprintf(": %s", log_msg);
3434 Uunlink(spool_name);
3435 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3436 smtp_yield = FALSE; /* No more messages after dropped connection */
3437 smtp_reply = US""; /* Indicate reply already sent */
3438 message_id[0] = 0; /* Indicate no message accepted */
3439 goto TIDYUP; /* Skip to end of function */
3443 dkim_exim_verify_log_all();
3445 #endif /* DISABLE_DKIM */
3447 #ifdef WITH_CONTENT_SCAN
3448 if ( recipients_count > 0
3450 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3453 #endif /* WITH_CONTENT_SCAN */
3455 #ifdef EXPERIMENTAL_DMARC
3456 dmarc_up = dmarc_store_data(from_header);
3457 #endif /* EXPERIMENTAL_DMARC */
3459 #ifndef DISABLE_PRDR
3460 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3464 int all_fail = FAIL;
3466 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3467 /* Loop through recipients, responses must be in same order received */
3468 for (c = 0; recipients_count > c; c++)
3470 uschar * addr= recipients_list[c].address;
3471 uschar * msg= US"PRDR R=<%s> %s";
3474 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3475 addr, c+1, recipients_count);
3476 rc = acl_check(ACL_WHERE_PRDR, addr,
3477 acl_smtp_data_prdr, &user_msg, &log_msg);
3479 /* If any recipient rejected content, indicate it in final message */
3481 /* If all recipients rejected, indicate in final message */
3486 case OK: case DISCARD: code = US"250"; break;
3487 case DEFER: code = US"450"; break;
3488 default: code = US"550"; break;
3490 if (user_msg != NULL)
3491 smtp_user_msg(code, user_msg);
3496 case OK: case DISCARD:
3497 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3499 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3501 msg = string_sprintf(CS msg, addr, "refusal"); break;
3503 smtp_user_msg(code, msg);
3505 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3506 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3507 else log_write(0, LOG_MAIN, "%s", CS msg);
3509 if (rc != OK) { receive_remove_recipient(addr); c--; }
3511 /* Set up final message, used if data acl gives OK */
3512 smtp_reply = string_sprintf("%s id=%s message %s",
3513 all_fail == FAIL ? US"550" : US"250",
3516 ? US"rejected for all recipients"
3519 : US"accepted for some recipients");
3520 if (recipients_count == 0)
3522 message_id[0] = 0; /* Indicate no message accepted */
3527 prdr_requested = FALSE;
3528 #endif /* !DISABLE_PRDR */
3530 /* Check the recipients count again, as the MIME ACL might have changed
3533 if (acl_smtp_data != NULL && recipients_count > 0)
3535 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3536 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3539 recipients_count = 0;
3540 blackholed_by = US"DATA ACL";
3542 blackhole_log_msg = string_sprintf(": %s", log_msg);
3543 cancel_cutthrough_connection(TRUE, US"data acl discard");
3547 Uunlink(spool_name);
3548 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3549 #ifdef WITH_CONTENT_SCAN
3552 #ifdef EXPERIMENTAL_DCC
3555 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3556 smtp_yield = FALSE; /* No more messages after dropped connection */
3557 smtp_reply = US""; /* Indicate reply already sent */
3558 message_id[0] = 0; /* Indicate no message accepted */
3559 goto TIDYUP; /* Skip to end of function */
3564 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3565 we cannot take different actions for permanent and temporary rejections. */
3570 #ifdef WITH_CONTENT_SCAN
3571 if ( acl_not_smtp_mime
3572 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3576 #endif /* WITH_CONTENT_SCAN */
3580 uschar *user_msg, *log_msg;
3581 authentication_local = TRUE;
3582 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3585 recipients_count = 0;
3586 blackholed_by = US"non-SMTP ACL";
3588 blackhole_log_msg = string_sprintf(": %s", log_msg);
3592 Uunlink(spool_name);
3593 #ifdef WITH_CONTENT_SCAN
3596 #ifdef EXPERIMENTAL_DCC
3599 /* The ACL can specify where rejections are to be logged, possibly
3600 nowhere. The default is main and reject logs. */
3602 if (log_reject_target)
3603 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3604 sender_address, log_msg);
3606 if (!user_msg) user_msg = US"local configuration problem";
3607 if (smtp_batched_input)
3609 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3610 /* Does not return */
3614 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3615 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3616 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3618 /* Does not return */
3621 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3625 /* The applicable ACLs have been run */
3627 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3628 if (queue_only_policy) queued_by = US"ACL";
3631 #ifdef WITH_CONTENT_SCAN
3635 #ifdef EXPERIMENTAL_DCC
3640 #ifdef HAVE_LOCAL_SCAN
3641 /* The final check on the message is to run the scan_local() function. The
3642 version supplied with Exim always accepts, but this is a hook for sysadmins to
3643 supply their own checking code. The local_scan() function is run even when all
3644 the recipients have been discarded. */
3646 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3648 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3649 deleted, and the incident gets logged. */
3651 if (sigsetjmp(local_scan_env, 1) == 0)
3653 had_local_scan_crash = 0;
3654 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3655 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3656 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3657 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3659 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3660 local_scan_timeout);
3661 local_scan_data = NULL;
3663 had_local_scan_timeout = 0;
3664 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3665 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3666 rc = local_scan(data_fd, &local_scan_data);
3668 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3670 enable_dollar_recipients = FALSE;
3672 store_pool = POOL_MAIN; /* In case changed */
3673 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3676 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3677 os_non_restarting_signal(SIGFPE, SIG_DFL);
3678 os_non_restarting_signal(SIGILL, SIG_DFL);
3679 os_non_restarting_signal(SIGBUS, SIG_DFL);
3683 if (had_local_scan_crash)
3685 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3686 "signal %d - message temporarily rejected (size %d)",
3687 had_local_scan_crash, message_size);
3688 /* Does not return */
3689 receive_bomb_out(US"local-scan-error", US"local verification problem");
3691 if (had_local_scan_timeout)
3693 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3694 "message temporarily rejected (size %d)", message_size);
3695 /* Does not return */
3696 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3700 /* The length check is paranoia against some runaway code, and also because
3701 (for a success return) lines in the spool file are read into big_buffer. */
3703 if (local_scan_data)
3705 int len = Ustrlen(local_scan_data);
3706 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3707 local_scan_data = string_copyn(local_scan_data, len);
3710 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3712 if (!deliver_freeze) /* ACL might have already frozen */
3714 deliver_freeze = TRUE;
3715 deliver_frozen_at = time(NULL);
3716 frozen_by = US"local_scan()";
3718 rc = LOCAL_SCAN_ACCEPT;
3720 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3722 if (!queue_only_policy) /* ACL might have already queued */
3724 queue_only_policy = TRUE;
3725 queued_by = US"local_scan()";
3727 rc = LOCAL_SCAN_ACCEPT;
3730 /* Message accepted: remove newlines in local_scan_data because otherwise
3731 the spool file gets corrupted. Ensure that all recipients are qualified. */
3733 if (rc == LOCAL_SCAN_ACCEPT)
3735 if (local_scan_data)
3738 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3740 for (i = 0; i < recipients_count; i++)
3742 recipient_item *r = recipients_list + i;
3743 r->address = rewrite_address_qualify(r->address, TRUE);
3744 if (r->errors_to != NULL)
3745 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3747 if (recipients_count == 0 && blackholed_by == NULL)
3748 blackholed_by = US"local_scan";
3751 /* Message rejected: newlines permitted in local_scan_data to generate
3752 multiline SMTP responses. */
3756 uschar *istemp = US"";
3760 errmsg = local_scan_data;
3762 Uunlink(spool_name); /* Cancel this message */
3766 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3767 "rejection given", rc);
3770 case LOCAL_SCAN_REJECT_NOLOGHDR:
3771 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3774 case LOCAL_SCAN_REJECT:
3775 smtp_code = US"550";
3776 if (!errmsg) errmsg = US"Administrative prohibition";
3779 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3780 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3783 case LOCAL_SCAN_TEMPREJECT:
3785 smtp_code = US"451";
3786 if (!errmsg) errmsg = US"Temporary local problem";
3787 istemp = US"temporarily ";
3791 g = string_append(NULL, 2, US"F=",
3792 sender_address[0] == 0 ? US"<>" : sender_address);
3793 g = add_host_info_for_log(g);
3795 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3796 string_from_gstring(g), istemp, string_printing(errmsg));
3800 if (!smtp_batched_input)
3802 smtp_respond(smtp_code, 3, TRUE, errmsg);
3803 message_id[0] = 0; /* Indicate no message accepted */
3804 smtp_reply = US""; /* Indicate reply already sent */
3805 goto TIDYUP; /* Skip to end of function */
3809 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3810 /* Does not return */
3815 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3816 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3817 US"message rejected by local scan code: ", error_rc, data_file,
3819 /* Does not return */
3823 /* Reset signal handlers to ignore signals that previously would have caused
3824 the message to be abandoned. */
3826 signal(SIGTERM, SIG_IGN);
3827 signal(SIGINT, SIG_IGN);
3828 #endif /* HAVE_LOCAL_SCAN */
3831 /* Ensure the first time flag is set in the newly-received message. */
3833 deliver_firsttime = TRUE;
3835 #ifdef EXPERIMENTAL_BRIGHTMAIL
3837 { /* rewind data file */
3838 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3839 bmi_verdicts = bmi_process_message(header_list, data_fd);
3843 /* Update the timestamp in our Received: header to account for any time taken by
3844 an ACL or by local_scan(). The new time is the time that all reception
3845 processing is complete. */
3847 timestamp = expand_string(US"${tod_full}");
3848 tslen = Ustrlen(timestamp);
3850 memcpy(received_header->text + received_header->slen - tslen - 1,
3853 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3857 deliver_freeze = FALSE;
3858 queue_only_policy = FALSE;
3861 /* Keep the data file open until we have written the header file, in order to
3862 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3863 don't write the header file, and we unlink the data file. If writing the header
3864 file fails, we have failed to accept this message. */
3866 if (host_checking || blackholed_by != NULL)
3869 Uunlink(spool_name);
3870 msg_size = 0; /* Compute size for log line */
3871 for (h = header_list; h != NULL; h = h->next)
3872 if (h->type != '*') msg_size += h->slen;
3875 /* Write the -H file */
3878 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3880 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3881 Uunlink(spool_name); /* Lose the data file */
3885 smtp_reply = US"451 Error in writing spool file";
3886 message_id[0] = 0; /* Indicate no message accepted */
3891 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3892 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3894 /* Does not return */
3899 /* The message has now been successfully received. */
3901 receive_messagecount++;
3903 /* In SMTP sessions we may receive several in one connection. After each one,
3904 we wait for the clock to tick at the level of message-id granularity. This is
3905 so that the combination of time+pid is unique, even on systems where the pid
3906 can be re-used within our time interval. We can't shorten the interval without
3907 re-designing the message-id. See comments above where the message id is
3908 created. This is Something For The Future. */
3910 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3911 exim_wait_tick(&message_id_tv, id_resolution);
3913 /* Add data size to written header size. We do not count the initial file name
3914 that is in the file, but we do add one extra for the notional blank line that
3915 precedes the data. This total differs from message_size in that it include the
3916 added Received: header and any other headers that got created locally. */
3919 fstat(data_fd, &statbuf);
3921 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3923 /* Generate a "message received" log entry. We do this by building up a dynamic
3924 string as required. Since we commonly want to add two items at a time, use a
3925 macro to simplify the coding. We log the arrival of a new message while the
3926 file is still locked, just in case the machine is *really* fast, and delivers
3927 it first! Include any message id that is in the message - since the syntax of a
3928 message id is actually an addr-spec, we can use the parse routine to canonicalize
3931 g = string_get(256);
3933 g = string_append(g, 2,
3934 fake_response == FAIL ? US"(= " : US"<= ",
3935 sender_address[0] == 0 ? US"<>" : sender_address);
3936 if (message_reference)
3937 g = string_append(g, 2, US" R=", message_reference);
3939 g = add_host_info_for_log(g);
3942 if (LOGGING(tls_cipher) && tls_in.cipher)
3943 g = string_append(g, 2, US" X=", tls_in.cipher);
3944 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3945 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3946 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3947 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3948 if (LOGGING(tls_sni) && tls_in.sni)
3949 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3952 if (sender_host_authenticated)
3954 g = string_append(g, 2, US" A=", sender_host_authenticated);
3955 if (authenticated_id)
3957 g = string_append(g, 2, US":", authenticated_id);
3958 if (LOGGING(smtp_mailauth) && authenticated_sender)
3959 g = string_append(g, 2, US":", authenticated_sender);
3963 #ifndef DISABLE_PRDR
3965 g = string_catn(g, US" PRDR", 5);
3968 #ifdef SUPPORT_PROXY
3969 if (proxy_session && LOGGING(proxy))
3970 g = string_append(g, 2, US" PRX=", proxy_local_address);
3973 if (chunking_state > CHUNKING_OFFERED)
3974 g = string_catn(g, US" K", 2);
3976 sprintf(CS big_buffer, "%d", msg_size);
3977 g = string_append(g, 2, US" S=", big_buffer);
3979 /* log 8BITMIME mode announced in MAIL_FROM
3983 if (LOGGING(8bitmime))
3985 sprintf(CS big_buffer, "%d", body_8bitmime);
3986 g = string_append(g, 2, US" M8S=", big_buffer);
3989 #ifndef DISABLE_DKIM
3990 if (LOGGING(dkim) && dkim_verify_overall)
3991 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
3992 # ifdef EXPERIMENTAL_ARC
3993 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
3994 g = string_catn(g, US" ARC", 4);
3998 if (LOGGING(receive_time))
3999 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
4002 g = string_append(g, 2, US" Q=", queue_name);
4004 /* If an addr-spec in a message-id contains a quoted string, it can contain
4005 any characters except " \ and CR and so in particular it can contain NL!
4006 Therefore, make sure we use a printing-characters only version for the log.
4007 Also, allow for domain literals in the message id. */
4012 BOOL save_allow_domain_literals = allow_domain_literals;
4013 allow_domain_literals = TRUE;
4014 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4015 &errmsg, &start, &end, &domain, FALSE);
4016 allow_domain_literals = save_allow_domain_literals;
4018 g = string_append(g, 2, US" id=", string_printing(old_id));
4021 /* If subject logging is turned on, create suitable printing-character
4022 text. By expanding $h_subject: we make use of the MIME decoding. */
4024 if (LOGGING(subject) && subject_header)
4027 uschar *p = big_buffer;
4028 uschar *ss = expand_string(US"$h_subject:");
4030 /* Backslash-quote any double quotes or backslashes so as to make a
4031 a C-like string, and turn any non-printers into escape sequences. */
4034 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4036 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4041 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4044 /* Terminate the string: string_cat() and string_append() leave room, but do
4045 not put the zero in. */
4047 (void) string_from_gstring(g);
4049 /* Create a message log file if message logs are being used and this message is
4050 not blackholed. Write the reception stuff to it. We used to leave message log
4051 creation until the first delivery, but this has proved confusing for some
4054 if (message_logs && !blackholed_by)
4058 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4060 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4064 (void)directory_make(spool_directory,
4065 spool_sname(US"msglog", message_subdir),
4066 MSGLOG_DIRECTORY_MODE, TRUE);
4067 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4071 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4072 spool_name, strerror(errno));
4075 FILE *message_log = fdopen(fd, "a");
4076 if (message_log == NULL)
4078 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4079 spool_name, strerror(errno));
4084 uschar *now = tod_stamp(tod_log);
4085 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4086 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4088 if (queue_only_policy) fprintf(message_log,
4089 "%s no immediate delivery: queued%s%s by %s\n", now,
4090 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4092 (void)fclose(message_log);
4097 /* Everything has now been done for a successful message except logging its
4098 arrival, and outputting an SMTP response. While writing to the log, set a flag
4099 to cause a call to receive_bomb_out() if the log cannot be opened. */
4101 receive_call_bombout = TRUE;
4103 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4104 connection has gone away. This can only be done if there is no unconsumed input
4105 waiting in the local input buffer. We can test for this by calling
4106 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4107 input to be sent following the final dot, so the presence of following input is
4110 If the connection is still present, but there is no unread input for the
4111 socket, the result of a select() call will be zero. If, however, the connection
4112 has gone away, or if there is pending input, the result of select() will be
4113 non-zero. The two cases can be distinguished by trying to read the next input
4114 character. If we succeed, we can unread it so that it remains in the local
4115 buffer for handling later. If not, the connection has been lost.
4117 Of course, since TCP/IP is asynchronous, there is always a chance that the
4118 connection will vanish between the time of this test and the sending of the
4119 response, but the chance of this happening should be small. */
4121 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4122 !receive_smtp_buffered())
4125 fd_set select_check;
4126 FD_ZERO(&select_check);
4127 FD_SET(fileno(smtp_in), &select_check);
4131 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4133 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4134 if (c != EOF) (receive_ungetc)(c); else
4136 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4137 smtp_reply = US""; /* No attempt to send a response */
4138 smtp_yield = FALSE; /* Nothing more on this connection */
4140 /* Re-use the log line workspace */
4143 g = string_cat(g, US"SMTP connection lost after final dot");
4144 g = add_host_info_for_log(g);
4145 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4147 /* Delete the files for this aborted message. */
4149 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4150 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4151 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4158 /* The connection has not gone away; we really are going to take responsibility
4159 for this message. */
4161 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4164 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4165 the sender's dot (below).
4166 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4167 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4168 in which case pass temp-reject back to initiator and dump the files.
4170 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4172 XXX We do not handle queue-only, freezing, or blackholes.
4174 if(cutthrough.fd >= 0 && cutthrough.delivery)
4176 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4177 /* Logging was done in finaldot() */
4180 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4181 cutthrough_done = ACCEPTED;
4182 break; /* message_id needed for SMTP accept below */
4184 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4185 ... for which, pass back the exact error */
4186 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4187 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4188 break; /* message_id needed for SMTP accept below */
4190 default: /* Unknown response, or error. Treat as temp-reject. */
4191 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4192 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4193 break; /* message_id needed for SMTP accept below */
4195 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4196 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4197 cutthrough_done = PERM_REJ;
4202 #ifndef DISABLE_PRDR
4203 if(!smtp_reply || prdr_requested)
4208 log_write(0, LOG_MAIN |
4209 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4210 (LOGGING(received_sender)? LOG_SENDER : 0),
4213 /* Log any control actions taken by an ACL or local_scan(). */
4215 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4216 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4217 "no immediate delivery: queued%s%s by %s",
4218 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4221 receive_call_bombout = FALSE;
4223 store_reset(g); /* The store for the main log message can be reused */
4225 /* If the message is frozen, and freeze_tell is set, do the telling. */
4227 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4229 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4230 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4231 message_id, frozen_by, sender_address);
4235 /* Either a message has been successfully received and written to the two spool
4236 files, or an error in writing the spool has occurred for an SMTP message, or
4237 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4238 we will have already given up because there's no point in carrying on!) In
4239 either event, we must now close (and thereby unlock) the data file. In the
4240 successful case, this leaves the message on the spool, ready for delivery. In
4241 the error case, the spool file will be deleted. Then tidy up store, interact
4242 with an SMTP call if necessary, and return.
4244 A fflush() was done earlier in the expectation that any write errors on the
4245 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4246 possible for fclose() to fail - but what to do? What has happened to the lock
4251 process_info[process_info_len] = 0; /* Remove message id */
4252 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4254 /* Now reset signal handlers to their defaults */
4256 signal(SIGTERM, SIG_DFL);
4257 signal(SIGINT, SIG_DFL);
4259 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4260 value, which defaults TRUE - meaning there may be more incoming messages from
4261 this connection. For non-SMTP callers (where there is only ever one message),
4262 the default is FALSE. */
4268 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4269 is set to the response that should be sent. When it is NULL, we generate
4270 default responses. After an ACL error or local_scan() error, the response has
4271 already been sent, and smtp_reply is an empty string to indicate this. */
4273 if (!smtp_batched_input)
4277 if (fake_response != OK)
4278 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4279 3, TRUE, fake_response_text);
4281 /* An OK response is required; use "message" text if present. */
4285 uschar *code = US"250";
4287 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4288 smtp_respond(code, len, TRUE, user_msg);
4291 /* Default OK response */
4293 else if (chunking_state > CHUNKING_OFFERED)
4295 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4296 chunking_datasize, message_size+message_linecount, message_id);
4297 chunking_state = CHUNKING_OFFERED;
4300 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4304 "\n**** SMTP testing: that is not a real message id!\n\n");
4307 /* smtp_reply is set non-empty */
4309 else if (smtp_reply[0] != 0)
4310 if (fake_response != OK && (smtp_reply[0] == '2'))
4311 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4312 fake_response_text);
4314 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4316 switch (cutthrough_done)
4319 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4321 /* Delete spool files */
4322 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4323 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4324 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4328 if (cutthrough.defer_pass)
4330 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4331 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4332 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4337 if (cutthrough_done != NOT_TRIED)
4339 message_id[0] = 0; /* Prevent a delivery from starting */
4340 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4341 cutthrough.defer_pass = FALSE;
4345 /* For batched SMTP, generate an error message on failure, and do
4346 nothing on success. The function moan_smtp_batch() does not return -
4347 it exits from the program with a non-zero return code. */
4349 else if (smtp_reply)
4350 moan_smtp_batch(NULL, "%s", smtp_reply);
4354 /* If blackholing, we can immediately log this message's sad fate. The data
4355 file has already been unlinked, and the header file was never written to disk.
4356 We must now indicate that nothing was received, to prevent a delivery from
4361 const uschar *detail =
4362 #ifdef HAVE_LOCAL_SCAN
4363 local_scan_data ? string_printing(local_scan_data) :
4365 string_sprintf("(%s discarded recipients)", blackholed_by);
4366 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4367 log_write(0, LOG_MAIN, "Completed");
4371 /* Reset headers so that logging of rejects for a subsequent message doesn't
4372 include them. It is also important to set header_last = NULL before exiting
4373 from this function, as this prevents certain rewrites that might happen during
4374 subsequent verifying (of another incoming message) from trying to add headers
4375 when they shouldn't. */
4377 header_list = header_last = NULL;
4379 return yield; /* TRUE if more messages (SMTP only) */
4382 /* End of receive.c */