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 int data_fd = -1;
26 static uschar *spool_name = US"";
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
30 #ifdef HAVE_LOCAL_SCAN
31 jmp_buf local_scan_env; /* error-handling context for local_scan */
32 unsigned had_local_scan_crash;
33 unsigned had_local_scan_timeout;
37 /*************************************************
38 * Non-SMTP character reading functions *
39 *************************************************/
41 /* These are the default functions that are set up in the variables such as
42 receive_getc initially. They just call the standard functions, passing stdin as
43 the file. (When SMTP input is occurring, different functions are used by
44 changing the pointer variables.) */
47 stdin_getc(unsigned lim)
53 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
54 log_write(L_lost_incoming_connection,
55 LOG_MAIN, "timed out while reading local message");
56 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
60 if (filter_test == FTEST_NONE)
62 fprintf(stderr, "\nexim: %s received - message abandoned\n",
63 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
64 log_write(0, LOG_MAIN, "%s received while reading local message",
65 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
67 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
75 return ungetc(c, stdin);
93 /*************************************************
94 * Check that a set sender is allowed *
95 *************************************************/
97 /* This function is called when a local caller sets an explicit sender address.
98 It checks whether this is permitted, which it is for trusted callers.
99 Otherwise, it must match the pattern(s) in untrusted_set_sender.
101 Arguments: the proposed sender address
102 Returns: TRUE for a trusted caller
103 TRUE if the address has been set, untrusted_set_sender has been
104 set, and the address matches something in the list
109 receive_check_set_sender(uschar *newsender)
112 if (f.trusted_caller) return TRUE;
113 if (!newsender || !untrusted_set_sender) return FALSE;
114 qnewsender = Ustrchr(newsender, '@')
115 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
116 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
122 /*************************************************
123 * Read space info for a partition *
124 *************************************************/
126 /* This function is called by receive_check_fs() below, and also by string
127 expansion for variables such as $spool_space. The field names for the statvfs
128 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
129 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
130 have inodes, and they return -1 for the number available.
132 Later: It turns out that some file systems that do not have the concept of
133 inodes return 0 rather than -1. Such systems should also return 0 for the total
134 number of inodes, so we require that to be greater than zero before returning
138 isspool TRUE for spool partition, FALSE for log partition
139 inodeptr address of int to receive inode count; -1 if there isn't one
141 Returns: available on-root space, in kilobytes
142 -1 for log partition if there isn't one
144 All values are -1 if the STATFS functions are not available.
148 receive_statvfs(BOOL isspool, int *inodeptr)
151 struct STATVFS statbuf;
157 /* The spool directory must always exist. */
161 path = spool_directory;
165 /* Need to cut down the log file path to the directory, and to ignore any
166 appearance of "syslog" in it. */
170 int sep = ':'; /* Not variable - outside scripts use */
171 const uschar *p = log_file_path;
174 /* An empty log_file_path means "use the default". This is the same as an
175 empty item in a list. */
177 if (*p == 0) p = US":";
178 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
179 if (Ustrcmp(path, "syslog") != 0)
182 if (path == NULL) /* No log files */
188 /* An empty string means use the default, which is in the spool directory.
189 But don't just use the spool directory, as it is possible that the log
190 subdirectory has been symbolically linked elsewhere. */
194 sprintf(CS buffer, CS"%s/log", CS spool_directory);
200 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
204 /* We now have the path; do the business */
206 memset(&statbuf, 0, sizeof(statbuf));
208 if (STATVFS(CS path, &statbuf) != 0)
209 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
210 { /* Can happen on first run after installation */
216 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
217 "%s directory %s: %s", name, path, strerror(errno));
218 smtp_closedown(US"spool or log directory problem");
219 exim_exit(EXIT_FAILURE, NULL);
222 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
224 /* Disks are getting huge. Take care with computing the size in kilobytes. */
226 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
229 /* Unable to find partition sizes in this environment. */
239 /*************************************************
240 * Check space on spool and log partitions *
241 *************************************************/
243 /* This function is called before accepting a message; if any thresholds are
244 set, it checks them. If a message_size is supplied, it checks that there is
245 enough space for that size plus the threshold - i.e. that the message won't
246 reduce the space to the threshold. Not all OS have statvfs(); for those that
247 don't, this function always returns TRUE. For some OS the old function and
248 struct name statfs is used; that is handled by a macro, defined in exim.h.
251 msg_size the (estimated) size of an incoming message
253 Returns: FALSE if there isn't enough space, or if the information cannot
255 TRUE if no check was done or there is enough space
259 receive_check_fs(int msg_size)
261 int_eximarith_t space;
264 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
266 space = receive_statvfs(TRUE, &inodes);
269 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
270 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
271 space, inodes, check_spool_space, check_spool_inodes, msg_size);
273 if ((space >= 0 && space < check_spool_space) ||
274 (inodes >= 0 && inodes < check_spool_inodes))
276 log_write(0, LOG_MAIN, "spool directory space check failed: space="
277 PR_EXIM_ARITH " inodes=%d", space, inodes);
282 if (check_log_space > 0 || check_log_inodes > 0)
284 space = receive_statvfs(FALSE, &inodes);
287 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
288 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
289 space, inodes, check_log_space, check_log_inodes);
291 if ( space >= 0 && space < check_log_space
292 || inodes >= 0 && inodes < check_log_inodes)
294 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
295 " inodes=%d", space, inodes);
305 /*************************************************
306 * Bomb out while reading a message *
307 *************************************************/
309 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
310 received, or if there is a timeout. A rarer case might be if the log files are
311 screwed up and Exim can't open them to record a message's arrival. Handling
312 that case is done by setting a flag to cause the log functions to call this
313 function if there is an ultimate disaster. That is why it is globally
317 reason text reason to pass to the not-quit ACL
318 msg default SMTP response to give if in an SMTP session
323 receive_bomb_out(uschar *reason, uschar *msg)
325 static BOOL already_bombing_out;
326 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
327 timeouts, if someone has something slow in their quit ACL. Since the only
328 things we should be doing are to close down cleanly ASAP, on the second
329 pass we also close down stuff that might be opened again, before bypassing
330 the ACL call and exiting. */
332 /* If spool_name is set, it contains the name of the data file that is being
333 written. Unlink it before closing so that it cannot be picked up by a delivery
334 process. Ensure that any header file is also removed. */
336 if (spool_name[0] != '\0')
339 spool_name[Ustrlen(spool_name) - 1] = 'H';
341 spool_name[0] = '\0';
344 /* Now close the file if it is open, either as a fd or a stream. */
348 (void)fclose(spool_data_file);
349 spool_data_file = NULL;
351 else if (data_fd >= 0)
353 (void)close(data_fd);
357 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
358 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
361 if (!already_bombing_out)
363 already_bombing_out = TRUE;
366 if (smtp_batched_input)
367 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
368 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
369 smtp_active_hostname, msg);
373 /* Exit from the program (non-BSMTP cases) */
375 exim_exit(EXIT_FAILURE, NULL);
379 /*************************************************
380 * Data read timeout *
381 *************************************************/
383 /* Handler function for timeouts that occur while reading the data that
386 Argument: the signal number
391 data_timeout_handler(int sig)
393 had_data_timeout = sig;
398 #ifdef HAVE_LOCAL_SCAN
399 /*************************************************
400 * local_scan() timeout *
401 *************************************************/
403 /* Handler function for timeouts that occur while running a local_scan()
404 function. Posix recommends against calling longjmp() from a signal-handler,
405 but the GCC manual says you can so we will, and trust that it's better than
406 calling probably non-signal-safe funxtions during logging from within the
407 handler, even with other compilers.
409 See also https://cwe.mitre.org/data/definitions/745.html which also lists
412 This is all because we have no control over what might be written for a
413 local-scan function, so cannot sprinkle had-signal checks after each
414 call-site. At least with the default "do-nothing" function we won't
417 Argument: the signal number
422 local_scan_timeout_handler(int sig)
424 had_local_scan_timeout = sig;
425 siglongjmp(local_scan_env, 1);
430 /*************************************************
431 * local_scan() crashed *
432 *************************************************/
434 /* Handler function for signals that occur while running a local_scan()
437 Argument: the signal number
442 local_scan_crash_handler(int sig)
444 had_local_scan_crash = sig;
445 siglongjmp(local_scan_env, 1);
448 #endif /*HAVE_LOCAL_SCAN*/
451 /*************************************************
452 * SIGTERM or SIGINT received *
453 *************************************************/
455 /* Handler for SIGTERM or SIGINT signals that occur while reading the
456 data that comprises a message.
458 Argument: the signal number
463 data_sigterm_sigint_handler(int sig)
465 had_data_sigint = sig;
470 /*************************************************
471 * Add new recipient to list *
472 *************************************************/
474 /* This function builds a list of recipient addresses in argc/argv
478 recipient the next address to add to recipients_list
479 pno parent number for fixed aliases; -1 otherwise
485 receive_add_recipient(uschar *recipient, int pno)
487 if (recipients_count >= recipients_list_max)
489 recipient_item *oldlist = recipients_list;
490 int oldmax = recipients_list_max;
491 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
492 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
494 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
497 recipients_list[recipients_count].address = recipient;
498 recipients_list[recipients_count].pno = pno;
499 #ifdef EXPERIMENTAL_BRIGHTMAIL
500 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
501 /* reset optin string pointer for next recipient */
502 bmi_current_optin = NULL;
504 recipients_list[recipients_count].orcpt = NULL;
505 recipients_list[recipients_count].dsn_flags = 0;
506 recipients_list[recipients_count++].errors_to = NULL;
512 /*************************************************
513 * Send user response message *
514 *************************************************/
516 /* This function is passed a default response code and a user message. It calls
517 smtp_message_code() to check and possibly modify the response code, and then
518 calls smtp_respond() to transmit the response. I put this into a function
519 just to avoid a lot of repetition.
522 code the response code
523 user_msg the user message
530 smtp_user_msg(uschar *code, uschar *user_msg)
533 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
534 smtp_respond(code, len, TRUE, user_msg);
542 /*************************************************
543 * Remove a recipient from the list *
544 *************************************************/
546 /* This function is provided for local_scan() to use.
549 recipient address to remove
551 Returns: TRUE if it did remove something; FALSE otherwise
555 receive_remove_recipient(uschar *recipient)
557 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
559 for (int count = 0; count < recipients_count; count++)
560 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
562 if ((--recipients_count - count) > 0)
563 memmove(recipients_list + count, recipients_list + count + 1,
564 (recipients_count - count)*sizeof(recipient_item));
574 /*************************************************
575 * Read data portion of a non-SMTP message *
576 *************************************************/
578 /* This function is called to read the remainder of a message (following the
579 header) when the input is not from SMTP - we are receiving a local message on
580 a standard input stream. The message is always terminated by EOF, and is also
581 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
582 two cases for maximum efficiency.
584 Ensure that the body ends with a newline. This will naturally be the case when
585 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
586 as "sequences of lines" - this of course strictly applies only to SMTP, but
587 deliveries into BSD-type mailbox files also require it. Exim used to have a
588 flag for doing this at delivery time, but as it was always set for all
589 transports, I decided to simplify things by putting the check here instead.
591 There is at least one MUA (dtmail) that sends CRLF via this interface, and
592 other programs are known to do this as well. Exim used to have a option for
593 dealing with this: in July 2003, after much discussion, the code has been
594 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
596 However, for the case when a dot on a line by itself terminates a message, the
597 only recognized terminating sequences before and after the dot are LF and CRLF.
598 Otherwise, having read EOL . CR, you don't know whether to read another
601 Internally, in messages stored in Exim's spool files, LF is used as the line
602 terminator. Under the new regime, bare CRs will no longer appear in these
606 fout a FILE to which to write the message
608 Returns: One of the END_xxx values indicating why it stopped reading
612 read_message_data(FILE *fout)
616 register int linelength = 0;
618 /* Handle the case when only EOF terminates the message */
622 register int last_ch = '\n';
624 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
626 if (ch == 0) body_zerocount++;
627 if (last_ch == '\r' && ch != '\n')
629 if (linelength > max_received_linelength)
630 max_received_linelength = linelength;
632 if (fputc('\n', fout) == EOF) return END_WERROR;
636 if (ch == '\r') continue;
638 if (fputc(ch, fout) == EOF) return END_WERROR;
641 if (linelength > max_received_linelength)
642 max_received_linelength = linelength;
647 if (++message_size > thismessage_size_limit) return END_SIZE;
652 if (linelength > max_received_linelength)
653 max_received_linelength = linelength;
654 if (fputc('\n', fout) == EOF) return END_WERROR;
662 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
666 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
668 if (ch == 0) body_zerocount++;
671 case 0: /* Normal state (previous char written) */
675 if (linelength > max_received_linelength)
676 max_received_linelength = linelength;
681 { ch_state = 2; continue; }
684 case 1: /* After written "\n" */
685 if (ch == '.') { ch_state = 3; continue; }
686 if (ch == '\r') { ch_state = 2; continue; }
687 if (ch == '\n') { body_linecount++; linelength = -1; }
692 body_linecount++; /* After unwritten "\r" */
693 if (linelength > max_received_linelength)
694 max_received_linelength = linelength;
702 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
703 if (ch == '\r') continue;
709 case 3: /* After "\n." (\n written, dot not) */
710 if (ch == '\n') return END_DOT;
711 if (ch == '\r') { ch_state = 4; continue; }
714 if (fputc('.', fout) == EOF) return END_WERROR;
718 case 4: /* After "\n.\r" (\n written, rest not) */
719 if (ch == '\n') return END_DOT;
722 if (fputs(".\n", fout) == EOF) return END_WERROR;
723 if (ch == '\r') { ch_state = 2; continue; }
729 if (fputc(ch, fout) == EOF) return END_WERROR;
730 if (++message_size > thismessage_size_limit) return END_SIZE;
733 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
734 the message ends with a newline, and we must also write any characters that
735 were saved up while testing for an ending dot. */
739 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
740 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
741 message_size += Ustrlen(ends[ch_state]);
751 /*************************************************
752 * Read data portion of an SMTP message *
753 *************************************************/
755 /* This function is called to read the remainder of an SMTP message (after the
756 headers), or to skip over it when an error has occurred. In this case, the
757 output file is passed as NULL.
759 If any line begins with a dot, that character is skipped. The input should only
760 be successfully terminated by CR LF . CR LF unless it is local (non-network)
761 SMTP, in which case the CRs are optional, but...
763 FUDGE: It seems that sites on the net send out messages with just LF
764 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
765 we make the CRs optional in all cases.
767 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
768 well, so that there are no CRs in spooled messages. However, the message
769 terminating dot is not recognized between two bare CRs.
772 fout a FILE to which to write the message; NULL if skipping
774 Returns: One of the END_xxx values indicating why it stopped reading
778 read_message_data_smtp(FILE *fout)
784 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
786 if (ch == 0) body_zerocount++;
789 case 0: /* After LF or CRLF */
793 continue; /* Don't ever write . after LF */
797 /* Else fall through to handle as normal uschar. */
799 case 1: /* Normal state */
804 if (linelength > max_received_linelength)
805 max_received_linelength = linelength;
815 case 2: /* After (unwritten) CR */
817 if (linelength > max_received_linelength)
818 max_received_linelength = linelength;
827 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
828 cutthrough_data_put_nl();
829 if (ch != '\r') ch_state = 1; else continue;
833 case 3: /* After [CR] LF . */
841 /* The dot was removed at state 3. For a doubled dot, here, reinstate
842 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
843 and to file below. */
847 cutthrough_data_puts(&c, 1);
852 case 4: /* After [CR] LF . CR */
853 if (ch == '\n') return END_DOT;
856 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
857 cutthrough_data_put_nl();
867 /* Add the character to the spool file, unless skipping; then loop for the
874 if (fputc(ch, fout) == EOF) return END_WERROR;
875 if (message_size > thismessage_size_limit) return END_SIZE;
878 cutthrough_data_put_nl();
882 cutthrough_data_puts(&c, 1);
886 /* Fall through here if EOF encountered. This indicates some kind of error,
887 since a correct message is terminated by [CR] LF . [CR] LF. */
895 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
896 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
897 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
898 body_linecount accounting for proper re-expansion for the wire, so use
899 a cut-down version of the state-machine above; we don't need to do leading-dot
900 detection and unstuffing.
903 fout a FILE to which to write the message; NULL if skipping;
904 must be open for both writing and reading.
906 Returns: One of the END_xxx values indicating why it stopped reading
910 read_message_bdat_smtp(FILE *fout)
912 int linelength = 0, ch;
913 enum CH_STATE ch_state = LF_SEEN;
918 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
920 case EOF: return END_EOF;
921 case ERR: return END_PROTOCOL;
923 /* Nothing to get from the sender anymore. We check the last
924 character written to the spool.
926 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
927 If we would be strict, we would refuse such broken messages.
928 But we are liberal, so we fix it. It would be easy just to append
929 the "\n" to the spool.
931 But there are some more things (line counting, message size calculation and such),
932 that would need to be duplicated here. So we simply do some ungetc
937 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
938 if (fgetc(fout) == '\n') return END_DOT;
941 if (linelength == -1) /* \r already seen (see below) */
943 DEBUG(D_receive) debug_printf("Add missing LF\n");
947 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
948 bdat_ungetc('\r'); /* not even \r was seen */
952 case '\0': body_zerocount++; break;
956 case LF_SEEN: /* After LF or CRLF */
958 /* fall through to handle as normal uschar. */
960 case MID_LINE: /* Mid-line state */
965 if (linelength > max_received_linelength)
966 max_received_linelength = linelength;
972 if (fix_nl) bdat_ungetc('\n');
973 continue; /* don't write CR */
977 case CR_SEEN: /* After (unwritten) CR */
979 if (linelength > max_received_linelength)
980 max_received_linelength = linelength;
987 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
988 cutthrough_data_put_nl();
989 if (ch == '\r') continue; /* don't write CR */
995 /* Add the character to the spool file, unless skipping */
1001 if (fputc(ch, fout) == EOF) return END_WERROR;
1002 if (message_size > thismessage_size_limit) return END_SIZE;
1005 cutthrough_data_put_nl();
1009 cutthrough_data_puts(&c, 1);
1016 read_message_bdat_smtp_wire(FILE *fout)
1020 /* Remember that this message uses wireformat. */
1022 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1023 fout ? "writing spoolfile in wire format" : "flushing input");
1024 f.spool_file_wireformat = TRUE;
1028 if (chunking_data_left > 0)
1030 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1031 uschar * buf = bdat_getbuf(&len);
1033 if (!buf) return END_EOF;
1034 message_size += len;
1035 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1037 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1039 case EOF: return END_EOF;
1040 case EOD: return END_DOT;
1041 case ERR: return END_PROTOCOL;
1047 max_received_linelength
1051 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1054 if (message_size > thismessage_size_limit) return END_SIZE;
1062 /*************************************************
1063 * Swallow SMTP message *
1064 *************************************************/
1066 /* This function is called when there has been some kind of error while reading
1067 an SMTP message, and the remaining data may need to be swallowed. It is global
1068 because it is called from smtp_closedown() to shut down an incoming call
1071 Argument: a FILE from which to read the message
1076 receive_swallow_smtp(void)
1078 if (message_ended >= END_NOTENDED)
1079 message_ended = chunking_state <= CHUNKING_OFFERED
1080 ? read_message_data_smtp(NULL)
1081 : read_message_bdat_smtp_wire(NULL);
1086 /*************************************************
1087 * Handle lost SMTP connection *
1088 *************************************************/
1090 /* This function logs connection loss incidents and generates an appropriate
1093 Argument: additional data for the message
1094 Returns: the SMTP response
1098 handle_lost_connection(uschar *s)
1100 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1101 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1102 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1103 return US"421 Lost incoming connection";
1109 /*************************************************
1110 * Handle a non-smtp reception error *
1111 *************************************************/
1113 /* This function is called for various errors during the reception of non-SMTP
1114 messages. It either sends a message to the sender of the problem message, or it
1115 writes to the standard error stream.
1118 errcode code for moan_to_sender(), identifying the error
1119 text1 first message text, passed to moan_to_sender()
1120 text2 second message text, used only for stderrr
1121 error_rc code to pass to exim_exit if no problem
1122 f FILE containing body of message (may be stdin)
1123 hptr pointer to instore headers or NULL
1125 Returns: calls exim_exit(), which does not return
1129 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1130 FILE *f, header_line *hptr)
1132 if (error_handling == ERRORS_SENDER)
1136 eblock.text1 = text1;
1137 eblock.text2 = US"";
1138 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1139 error_rc = EXIT_FAILURE;
1142 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1144 exim_exit(error_rc, US"");
1149 /*************************************************
1150 * Add header lines set up by ACL *
1151 *************************************************/
1153 /* This function is called to add the header lines that were set up by
1154 statements in an ACL to the list of headers in memory. It is done in two stages
1155 like this, because when the ACL for RCPT is running, the other headers have not
1156 yet been received. This function is called twice; once just before running the
1157 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1158 are visible to the DATA ACL.
1160 Originally these header lines were added at the end. Now there is support for
1161 three different places: top, bottom, and after the Received: header(s). There
1162 will always be at least one Received: header, even if it is marked deleted, and
1163 even if something else has been put in front of it.
1166 acl_name text to identify which ACL
1172 add_acl_headers(int where, uschar *acl_name)
1174 header_line *last_received = NULL;
1178 case ACL_WHERE_DKIM:
1179 case ACL_WHERE_MIME:
1180 case ACL_WHERE_DATA:
1181 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1182 && (acl_removed_headers || acl_added_headers))
1184 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1185 " will not take effect on cutthrough deliveries");
1190 if (acl_removed_headers)
1192 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1194 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1196 const uschar * list = acl_removed_headers;
1197 int sep = ':'; /* This is specified as a colon-separated list */
1201 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1202 if (header_testname(h, s, Ustrlen(s), FALSE))
1204 h->type = htype_old;
1205 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1208 acl_removed_headers = NULL;
1209 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1212 if (!acl_added_headers) return;
1213 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1215 for (header_line * h = acl_added_headers, * next; h; h = next)
1222 h->next = header_list;
1224 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1230 last_received = header_list;
1231 while (!header_testname(last_received, US"Received", 8, FALSE))
1232 last_received = last_received->next;
1233 while (last_received->next &&
1234 header_testname(last_received->next, US"Received", 8, FALSE))
1235 last_received = last_received->next;
1237 h->next = last_received->next;
1238 last_received->next = h;
1239 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1243 /* add header before any header which is NOT Received: or Resent- */
1244 last_received = header_list;
1245 while ( last_received->next &&
1246 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1247 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1248 last_received = last_received->next;
1249 /* last_received now points to the last Received: or Resent-* header
1250 in an uninterrupted chain of those header types (seen from the beginning
1251 of all headers. Our current header must follow it. */
1252 h->next = last_received->next;
1253 last_received->next = h;
1254 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1259 header_last->next = h;
1260 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1264 if (!h->next) header_last = h;
1266 /* Check for one of the known header types (From:, To:, etc.) though in
1267 practice most added headers are going to be "other". Lower case
1268 identification letters are never stored with the header; they are used
1269 for existence tests when messages are received. So discard any lower case
1272 h->type = header_checkname(h, FALSE);
1273 if (h->type >= 'a') h->type = htype_other;
1275 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1278 acl_added_headers = NULL;
1279 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1284 /*************************************************
1285 * Add host information for log line *
1286 *************************************************/
1288 /* Called for acceptance and rejecting log lines. This adds information about
1289 the calling host to a string that is being built dynamically.
1292 s the dynamic string
1294 Returns: the extended string
1298 add_host_info_for_log(gstring * g)
1300 if (sender_fullhost)
1302 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1303 g = string_catn(g, US" DS", 3);
1304 g = string_append(g, 2, US" H=", sender_fullhost);
1305 if (LOGGING(incoming_interface) && interface_address)
1306 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1308 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1310 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1311 f.tcp_in_fastopen_logged = TRUE;
1314 g = string_append(g, 2, US" U=", sender_ident);
1315 if (received_protocol)
1316 g = string_append(g, 2, US" P=", received_protocol);
1317 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1319 g = string_catn(g, US" L", 2);
1320 #ifdef EXPERIMENTAL_PIPE_CONNECT
1321 if (f.smtp_in_early_pipe_used)
1322 g = string_catn(g, US"*", 1);
1323 else if (f.smtp_in_early_pipe_advertised)
1324 g = string_catn(g, US".", 1);
1326 if (!f.smtp_in_pipelining_used)
1327 g = string_catn(g, US"-", 1);
1334 #ifdef WITH_CONTENT_SCAN
1336 /*************************************************
1337 * Run the MIME ACL on a message *
1338 *************************************************/
1340 /* This code is in a subroutine so that it can be used for both SMTP
1341 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1344 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1345 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1346 smtp_reply_ptr Where SMTP reply is being built
1347 blackholed_by_ptr Where "blackholed by" message is being built
1349 Returns: TRUE to carry on; FALSE to abandon the message
1353 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1354 uschar **blackholed_by_ptr)
1357 uschar * rfc822_file_path = NULL;
1358 unsigned long mbox_size;
1359 uschar *user_msg, *log_msg;
1360 int mime_part_count_buffer = -1;
1361 uschar * mbox_filename;
1364 /* check if it is a MIME message */
1366 for (header_line * my_headerlist = header_list; my_headerlist;
1367 my_headerlist = my_headerlist->next)
1368 if ( my_headerlist->type != '*' /* skip deleted headers */
1369 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1372 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1376 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1381 /* make sure the eml mbox file is spooled up */
1382 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1383 { /* error while spooling */
1384 log_write(0, LOG_MAIN|LOG_PANIC,
1385 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1386 Uunlink(spool_name);
1388 #ifdef EXPERIMENTAL_DCC
1391 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1392 message_id[0] = 0; /* Indicate no message accepted */
1393 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1394 return FALSE; /* Indicate skip to end of receive function */
1400 mime_part_count = -1;
1401 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1402 (void)fclose(mbox_file);
1404 if (rfc822_file_path)
1406 mime_part_count = mime_part_count_buffer;
1408 if (unlink(CS rfc822_file_path) == -1)
1410 log_write(0, LOG_PANIC,
1411 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1414 rfc822_file_path = NULL;
1417 /* check if we must check any message/rfc822 attachments */
1420 uschar * scandir = string_copyn(mbox_filename,
1421 Ustrrchr(mbox_filename, '/') - mbox_filename);
1422 struct dirent * entry;
1425 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1426 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1428 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1430 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1436 if (rfc822_file_path)
1438 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1440 /* set RFC822 expansion variable */
1442 mime_part_count_buffer = mime_part_count;
1443 goto MIME_ACL_CHECK;
1445 log_write(0, LOG_PANIC,
1446 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1447 unlink(CS rfc822_file_path);
1452 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1455 recipients_count = 0;
1456 *blackholed_by_ptr = US"MIME ACL";
1457 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1461 Uunlink(spool_name);
1462 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1464 #ifdef EXPERIMENTAL_DCC
1469 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1470 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1471 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1473 message_id[0] = 0; /* Indicate no message accepted */
1474 return FALSE; /* Cause skip to end of receive function */
1480 #endif /* WITH_CONTENT_SCAN */
1485 received_header_gen(void)
1489 header_line *received_header= header_list;
1491 timestamp = expand_string(US"${tod_full}");
1492 if (recipients_count == 1) received_for = recipients_list[0].address;
1493 received = expand_string(received_header_text);
1494 received_for = NULL;
1498 if(spool_name[0] != 0)
1499 Uunlink(spool_name); /* Lose the data file */
1500 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1501 "(received_header_text) failed: %s", string_printing(received_header_text),
1502 expand_string_message);
1505 /* The first element on the header chain is reserved for the Received header,
1506 so all we have to do is fill in the text pointer, and set the type. However, if
1507 the result of the expansion is an empty string, we leave the header marked as
1508 "old" so as to refrain from adding a Received header. */
1510 if (received[0] == 0)
1512 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1513 received_header->type = htype_old;
1517 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1518 received_header->type = htype_received;
1521 received_header->slen = Ustrlen(received_header->text);
1523 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1524 received_header->type, received_header->text);
1529 /*************************************************
1531 *************************************************/
1533 /* Receive a message on the given input, and put it into a pair of spool files.
1534 Either a non-null list of recipients, or the extract flag will be true, or
1535 both. The flag sender_local is true for locally generated messages. The flag
1536 submission_mode is true if an ACL has obeyed "control = submission". The flag
1537 suppress_local_fixups is true if an ACL has obeyed "control =
1538 suppress_local_fixups" or -G was passed on the command-line.
1539 The flag smtp_input is true if the message is to be
1540 handled using SMTP conventions about termination and lines starting with dots.
1541 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1543 If a message was successfully read, message_id[0] will be non-zero.
1545 The general actions of this function are:
1547 . Read the headers of the message (if any) into a chain of store
1550 . If there is a "sender:" header and the message is locally originated,
1551 throw it away, unless the caller is trusted, or unless
1552 active_local_sender_retain is set - which can only happen if
1553 active_local_from_check is false.
1555 . If recipients are to be extracted from the message, build the
1556 recipients list from the headers, removing any that were on the
1557 original recipients list (unless extract_addresses_remove_arguments is
1558 false), and at the same time, remove any bcc header that may be present.
1560 . Get the spool file for the data, sort out its unique name, open
1561 and lock it (but don't give it the name yet).
1563 . Generate a "Message-Id" header if the message doesn't have one, for
1564 locally-originated messages.
1566 . Generate a "Received" header.
1568 . Ensure the recipients list is fully qualified and rewritten if necessary.
1570 . If there are any rewriting rules, apply them to the sender address
1571 and also to the headers.
1573 . If there is no from: header, generate one, for locally-generated messages
1574 and messages in "submission mode" only.
1576 . If the sender is local, check that from: is correct, and if not, generate
1577 a Sender: header, unless message comes from a trusted caller, or this
1578 feature is disabled by active_local_from_check being false.
1580 . If there is no "date" header, generate one, for locally-originated
1581 or submission mode messages only.
1583 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1584 dot_ends mode, to the data file. Leave it open, to hold the lock.
1586 . Write the envelope and the headers to a new file.
1588 . Set the name for the header file; close it.
1590 . Set the name for the data file; close it.
1592 Because this function can potentially be called many times in a single
1593 SMTP connection, all store should be got by store_get(), so that it will be
1594 automatically retrieved after the message is accepted.
1596 FUDGE: It seems that sites on the net send out messages with just LF
1597 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1598 we make the CRs optional in all cases.
1600 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1601 new regime is now in place in which bare CRs in header lines are turned into LF
1602 followed by a space, so as not to terminate the header line.
1604 February 2004: A bare LF in a header line in a message whose first line was
1605 terminated by CRLF is treated in the same way as a bare CR.
1608 extract_recip TRUE if recipients are to be extracted from the message's
1611 Returns: TRUE there are more messages to be read (SMTP input)
1612 FALSE there are no more messages to be read (non-SMTP input
1613 or SMTP connection collapsed, or other failure)
1615 When reading a message for filter testing, the returned value indicates
1616 whether the headers (which is all that is read) were terminated by '.' or
1620 receive_msg(BOOL extract_recip)
1624 int process_info_len = Ustrlen(process_info);
1625 int error_rc = error_handling == ERRORS_SENDER
1626 ? errors_sender_rc : EXIT_FAILURE;
1627 int header_size = 256;
1628 int start, end, domain;
1629 int id_resolution = 0;
1631 int prevlines_length = 0;
1635 BOOL contains_resent_headers = FALSE;
1636 BOOL extracted_ignored = FALSE;
1637 BOOL first_line_ended_crlf = TRUE_UNSET;
1638 BOOL smtp_yield = TRUE;
1641 BOOL resents_exist = FALSE;
1642 uschar *resent_prefix = US"";
1643 uschar *blackholed_by = NULL;
1644 uschar *blackhole_log_msg = US"";
1645 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1648 error_block *bad_addresses = NULL;
1650 uschar *frozen_by = NULL;
1651 uschar *queued_by = NULL;
1655 struct stat statbuf;
1657 /* Final message to give to SMTP caller, and messages from ACLs */
1659 uschar *smtp_reply = NULL;
1660 uschar *user_msg, *log_msg;
1662 /* Working header pointers */
1666 /* Flags for noting the existence of certain headers (only one left) */
1668 BOOL date_header_exists = FALSE;
1670 /* Pointers to receive the addresses of headers whose contents we need. */
1672 header_line *from_header = NULL;
1673 header_line *subject_header = NULL;
1674 header_line *msgid_header = NULL;
1675 header_line *received_header;
1676 BOOL msgid_header_newly_created = FALSE;
1678 #ifdef EXPERIMENTAL_DMARC
1680 #endif /* EXPERIMENTAL_DMARC */
1682 /* Variables for use when building the Received: header. */
1688 /* Release any open files that might have been cached while preparing to
1689 accept the message - e.g. by verifying addresses - because reading a message
1690 might take a fair bit of real time. */
1694 /* Extracting the recipient list from an input file is incompatible with
1695 cutthrough delivery with the no-spool option. It shouldn't be possible
1696 to set up the combination, but just in case kill any ongoing connection. */
1697 if (extract_recip || !smtp_input)
1698 cancel_cutthrough_connection(TRUE, US"not smtp input");
1700 /* Initialize the chain of headers by setting up a place-holder for Received:
1701 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1702 pointing to the end of the chain to make adding headers simple. */
1704 received_header = header_list = header_last = store_get(sizeof(header_line));
1705 header_list->next = NULL;
1706 header_list->type = htype_old;
1707 header_list->text = NULL;
1708 header_list->slen = 0;
1710 /* Control block for the next header to be read. */
1712 next = store_get(sizeof(header_line));
1713 next->text = store_get(header_size);
1715 /* Initialize message id to be null (indicating no message read), and the
1716 header names list to be the normal list. Indicate there is no data file open
1717 yet, initialize the size and warning count, and deal with no size limit. */
1720 spool_data_file = NULL;
1725 received_count = 1; /* For the one we will add */
1727 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1729 /* While reading the message, the following counts are computed. */
1731 message_linecount = body_linecount = body_zerocount =
1732 max_received_linelength = 0;
1734 #ifndef DISABLE_DKIM
1735 /* Call into DKIM to set up the context. In CHUNKING mode
1736 we clear the dot-stuffing flag */
1737 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1738 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1741 #ifdef EXPERIMENTAL_DMARC
1742 /* initialize libopendmarc */
1743 dmarc_up = dmarc_init();
1746 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1747 ids, and fractions of a second are required. See the comments that precede the
1748 message id creation below. */
1750 (void)gettimeofday(&message_id_tv, NULL);
1752 /* For other uses of the received time we can operate with granularity of one
1753 second, and for that we use the global variable received_time. This is for
1754 things like ultimate message timeouts. */
1756 received_time = message_id_tv;
1758 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1759 happen in the smtp_getc() function when it refills its buffer. */
1761 had_data_timeout = 0;
1763 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1765 /* If not SMTP input, timeout happens only if configured, and we just set a
1766 single timeout for the whole message. */
1768 else if (receive_timeout > 0)
1770 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1771 ALARM(receive_timeout);
1774 /* SIGTERM and SIGINT are caught always. */
1776 had_data_sigint = 0;
1777 signal(SIGTERM, data_sigterm_sigint_handler);
1778 signal(SIGINT, data_sigterm_sigint_handler);
1780 /* Header lines in messages are not supposed to be very long, though when
1781 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1782 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1783 storing the header, and extend this as necessary using string_cat().
1785 To cope with total lunacies, impose an upper limit on the length of the header
1786 section of the message, as otherwise the store will fill up. We must also cope
1787 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1788 Folded header lines are joined into one string, leaving the '\n' characters
1789 inside them, so that writing them out reproduces the input.
1791 Loop for each character of each header; the next structure for chaining the
1792 header is set up already, with ptr the offset of the next character in
1797 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1799 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1800 SMTP must have a correct "." terminator. */
1802 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1804 smtp_reply = handle_lost_connection(US" (header)");
1806 goto TIDYUP; /* Skip to end of function */
1809 /* See if we are at the current header's size limit - there must be at least
1810 four bytes left. This allows for the new character plus a zero, plus two for
1811 extra insertions when we are playing games with dots and carriage returns. If
1812 we are at the limit, extend the text buffer. This could have been done
1813 automatically using string_cat() but because this is a tightish loop storing
1814 only one character at a time, we choose to do it inline. Normally
1815 store_extend() will be able to extend the block; only at the end of a big
1816 store block will a copy be needed. To handle the case of very long headers
1817 (and sometimes lunatic messages can have ones that are 100s of K long) we
1818 call store_release() for strings that have been copied - if the string is at
1819 the start of a block (and therefore the only thing in it, because we aren't
1820 doing any other gets), the block gets freed. We can only do this release if
1821 there were no allocations since the once that we want to free. */
1823 if (ptr >= header_size - 4)
1825 int oldsize = header_size;
1827 if (header_size >= INT_MAX/2)
1831 if (!store_extend(next->text, oldsize, header_size))
1832 next->text = store_newblock(next->text, header_size, ptr);
1835 /* Cope with receiving a binary zero. There is dispute about whether
1836 these should be allowed in RFC 822 messages. The middle view is that they
1837 should not be allowed in headers, at least. Exim takes this attitude at
1838 the moment. We can't just stomp on them here, because we don't know that
1839 this line is a header yet. Set a flag to cause scanning later. */
1841 if (ch == 0) had_zero++;
1843 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1844 those from data files use just LF. Treat LF in local SMTP input as a
1845 terminator too. Treat EOF as a line terminator always. */
1847 if (ch == EOF) goto EOL;
1849 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1850 other MTAs accept this. We are therefore forced into this "liberalisation"
1851 too, so we accept LF as a line terminator whatever the source of the message.
1852 However, if the first line of the message ended with a CRLF, we treat a bare
1853 LF specially by inserting a white space after it to ensure that the header
1854 line is not terminated. */
1858 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1859 else if (first_line_ended_crlf) receive_ungetc(' ');
1863 /* This is not the end of the line. If this is SMTP input and this is
1864 the first character in the line and it is a "." character, ignore it.
1865 This implements the dot-doubling rule, though header lines starting with
1866 dots aren't exactly common. They are legal in RFC 822, though. If the
1867 following is CRLF or LF, this is the line that that terminates the
1868 entire message. We set message_ended to indicate this has happened (to
1869 prevent further reading), and break out of the loop, having freed the
1870 empty header, and set next = NULL to indicate no data line. */
1872 if (ptr == 0 && ch == '.' && f.dot_ends)
1874 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1877 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1881 ch = '\r'; /* Revert to CR */
1886 message_ended = END_DOT;
1889 break; /* End character-reading loop */
1892 /* For non-SMTP input, the dot at the start of the line was really a data
1893 character. What is now in ch is the following character. We guaranteed
1894 enough space for this above. */
1898 next->text[ptr++] = '.';
1903 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1904 remember this case if this is the first line ending. */
1908 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1911 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1915 /* Otherwise, put back the character after CR, and turn the bare CR
1918 ch = (receive_ungetc)(ch);
1919 next->text[ptr++] = '\n';
1924 /* We have a data character for the header line. */
1926 next->text[ptr++] = ch; /* Add to buffer */
1927 message_size++; /* Total message size so far */
1929 /* Handle failure due to a humungously long header section. The >= allows
1930 for the terminating \n. Add what we have so far onto the headers list so
1931 that it gets reflected in any error message, and back up the just-read
1934 if (message_size >= header_maxsize)
1937 next->text[ptr] = 0;
1939 next->type = htype_other;
1941 header_last->next = next;
1944 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1945 "%s (more than %d characters): message abandoned",
1946 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1950 smtp_reply = US"552 Message header is ridiculously long";
1951 receive_swallow_smtp();
1952 goto TIDYUP; /* Skip to end of function */
1957 give_local_error(ERRMESS_VLONGHEADER,
1958 string_sprintf("message header longer than %d characters received: "
1959 "message not accepted", header_maxsize), US"", error_rc, stdin,
1961 /* Does not return */
1965 continue; /* With next input character */
1967 /* End of header line reached */
1971 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1973 receive_linecount++;
1974 message_linecount++;
1976 /* Keep track of maximum line length */
1978 if (ptr - prevlines_length > max_received_linelength)
1979 max_received_linelength = ptr - prevlines_length;
1980 prevlines_length = ptr + 1;
1982 /* Now put in the terminating newline. There is always space for
1983 at least two more characters. */
1985 next->text[ptr++] = '\n';
1988 /* A blank line signals the end of the headers; release the unwanted
1989 space and set next to NULL to indicate this. */
1998 /* There is data in the line; see if the next input character is a
1999 whitespace character. If it is, we have a continuation of this header line.
2000 There is always space for at least one character at this point. */
2004 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2005 if (nextch == ' ' || nextch == '\t')
2007 next->text[ptr++] = nextch;
2008 if (++message_size >= header_maxsize)
2010 continue; /* Iterate the loop */
2012 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2013 else ch = EOF; /* Cause main loop to exit at end */
2016 /* We have got to the real line end. Terminate the string and release store
2017 beyond it. If it turns out to be a real header, internal binary zeros will
2018 be squashed later. */
2020 next->text[ptr] = 0;
2022 store_reset(next->text + ptr + 1);
2024 /* Check the running total size against the overall message size limit. We
2025 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2026 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2027 headers - the code to read the body will then also hit the buffer. */
2029 if (message_size > thismessage_size_limit) break;
2031 /* A line that is not syntactically correct for a header also marks
2032 the end of the headers. In this case, we leave next containing the
2033 first data line. This might actually be several lines because of the
2034 continuation logic applied above, but that doesn't matter.
2036 It turns out that smail, and presumably sendmail, accept leading lines
2039 From ph10 Fri Jan 5 12:35 GMT 1996
2041 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2042 find any documentation of this, but for compatibility it had better be
2043 accepted. Exim restricts it to the case of non-smtp messages, and
2044 treats it as an alternative to the -f command line option. Thus it is
2045 ignored except for trusted users or filter testing. Otherwise it is taken
2046 as the sender address, unless -f was used (sendmail compatibility).
2048 It further turns out that some UUCPs generate the From_line in a different
2051 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2053 The regex for matching these things is now capable of recognizing both
2054 formats (including 2- and 4-digit years in the latter). In fact, the regex
2055 is now configurable, as is the expansion string to fish out the sender.
2057 Even further on it has been discovered that some broken clients send
2058 these lines in SMTP messages. There is now an option to ignore them from
2059 specified hosts or networks. Sigh. */
2061 if ( header_last == header_list
2063 || ( sender_host_address
2064 && verify_check_host(&ignore_fromline_hosts) == OK
2066 || (!sender_host_address && ignore_fromline_local)
2068 && regex_match_and_setup(regex_From, next->text, 0, -1)
2071 if (!f.sender_address_forced)
2073 uschar *uucp_sender = expand_string(uucp_from_sender);
2075 log_write(0, LOG_MAIN|LOG_PANIC,
2076 "expansion of \"%s\" failed after matching "
2077 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2080 int start, end, domain;
2082 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2083 &start, &end, &domain, TRUE);
2086 if (domain == 0 && newsender[0] != 0)
2087 newsender = rewrite_address_qualify(newsender, FALSE);
2089 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2091 sender_address = newsender;
2093 if (f.trusted_caller || filter_test != FTEST_NONE)
2095 authenticated_sender = NULL;
2096 originator_name = US"";
2097 f.sender_local = FALSE;
2100 if (filter_test != FTEST_NONE)
2101 printf("Sender taken from \"From \" line\n");
2108 /* Not a leading "From " line. Check to see if it is a valid header line.
2109 Header names may contain any non-control characters except space and colon,
2114 uschar *p = next->text;
2116 /* If not a valid header line, break from the header reading loop, leaving
2117 next != NULL, indicating that it holds the first line of the body. */
2119 if (isspace(*p)) break;
2120 while (mac_isgraph(*p) && *p != ':') p++;
2121 while (isspace(*p)) p++;
2124 body_zerocount = had_zero;
2128 /* We have a valid header line. If there were any binary zeroes in
2129 the line, stomp on them here. */
2132 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2135 /* It is perfectly legal to have an empty continuation line
2136 at the end of a header, but it is confusing to humans
2137 looking at such messages, since it looks like a blank line.
2138 Reduce confusion by removing redundant white space at the
2139 end. We know that there is at least one printing character
2140 (the ':' tested for above) so there is no danger of running
2143 p = next->text + ptr - 2;
2146 while (*p == ' ' || *p == '\t') p--;
2147 if (*p != '\n') break;
2148 ptr = (p--) - next->text + 1;
2149 message_size -= next->slen - ptr;
2150 next->text[ptr] = 0;
2154 /* Add the header to the chain */
2156 next->type = htype_other;
2158 header_last->next = next;
2161 /* Check the limit for individual line lengths. This comes after adding to
2162 the chain so that the failing line is reflected if a bounce is generated
2163 (for a local message). */
2165 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2167 log_write(0, LOG_MAIN, "overlong message header line received from "
2168 "%s (more than %d characters): message abandoned",
2169 f.sender_host_unknown ? sender_ident : sender_fullhost,
2170 header_line_maxsize);
2174 smtp_reply = US"552 A message header line is too long";
2175 receive_swallow_smtp();
2176 goto TIDYUP; /* Skip to end of function */
2180 give_local_error(ERRMESS_VLONGHDRLINE,
2181 string_sprintf("message header line longer than %d characters "
2182 "received: message not accepted", header_line_maxsize), US"",
2183 error_rc, stdin, header_list->next);
2184 /* Does not return */
2187 /* Note if any resent- fields exist. */
2189 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2191 resents_exist = TRUE;
2192 resent_prefix = US"Resent-";
2196 /* Reject CHUNKING messages that do not CRLF their first header line */
2198 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2200 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2201 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2203 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2204 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2205 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2208 goto TIDYUP; /* Skip to end of function */
2211 /* The line has been handled. If we have hit EOF, break out of the loop,
2212 indicating no pending data line. */
2214 if (ch == EOF) { next = NULL; break; }
2216 /* Set up for the next header */
2219 next = store_get(sizeof(header_line));
2220 next->text = store_get(header_size);
2223 prevlines_length = 0;
2224 } /* Continue, starting to read the next header */
2226 /* At this point, we have read all the headers into a data structure in main
2227 store. The first header is still the dummy placeholder for the Received: header
2228 we are going to generate a bit later on. If next != NULL, it contains the first
2229 data line - which terminated the headers before reaching a blank line (not the
2234 debug_printf(">>Headers received:\n");
2235 for (header_line * h = header_list->next; h; h = h->next)
2236 debug_printf("%s", h->text);
2240 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2241 is dropped immediately after valid headers, the next thing we will see is EOF.
2242 We must test for this specially, as further down the reading of the data is
2243 skipped if already at EOF. */
2245 if (smtp_input && (receive_feof)())
2247 smtp_reply = handle_lost_connection(US" (after header)");
2249 goto TIDYUP; /* Skip to end of function */
2252 /* If this is a filter test run and no headers were read, output a warning
2253 in case there is a mistake in the test message. */
2255 if (filter_test != FTEST_NONE && header_list->next == NULL)
2256 printf("Warning: no message headers read\n");
2259 /* Scan the headers to identify them. Some are merely marked for later
2260 processing; some are dealt with here. */
2262 for (header_line * h = header_list->next; h; h = h->next)
2264 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2265 if (is_resent) contains_resent_headers = TRUE;
2267 switch (header_checkname(h, is_resent))
2270 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2274 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2277 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2280 if (!resents_exist || is_resent) date_header_exists = TRUE;
2283 /* Same comments as about Return-Path: below. */
2285 case htype_delivery_date:
2286 if (delivery_date_remove) h->type = htype_old;
2289 /* Same comments as about Return-Path: below. */
2291 case htype_envelope_to:
2292 if (envelope_to_remove) h->type = htype_old;
2295 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2296 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2297 header consists of just the login id of the user who called Exim, rewrite
2298 it with the gecos field first. Apply this rule to Resent-From: if there
2299 are resent- fields. */
2302 h->type = htype_from;
2303 if (!resents_exist || is_resent)
2309 uschar *s = Ustrchr(h->text, ':') + 1;
2310 while (isspace(*s)) s++;
2311 len = h->slen - (s - h->text) - 1;
2312 if (Ustrlen(originator_login) == len &&
2313 strncmpic(s, originator_login, len) == 0)
2315 uschar *name = is_resent? US"Resent-From" : US"From";
2316 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2317 originator_login, qualify_domain_sender);
2318 from_header = header_last;
2319 h->type = htype_old;
2320 DEBUG(D_receive|D_rewrite)
2321 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2327 /* Identify the Message-id: header for generating "in-reply-to" in the
2328 autoreply transport. For incoming logging, save any resent- value. In both
2329 cases, take just the first of any multiples. */
2332 if (!msgid_header && (!resents_exist || is_resent))
2339 /* Flag all Received: headers */
2341 case htype_received:
2342 h->type = htype_received;
2346 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2348 case htype_reply_to:
2349 h->type = htype_reply_to;
2352 /* The Return-path: header is supposed to be added to messages when
2353 they leave the SMTP system. We shouldn't receive messages that already
2354 contain Return-path. However, since Exim generates Return-path: on
2355 local delivery, resent messages may well contain it. We therefore
2356 provide an option (which defaults on) to remove any Return-path: headers
2357 on input. Removal actually means flagging as "old", which prevents the
2358 header being transmitted with the message. */
2360 case htype_return_path:
2361 if (return_path_remove) h->type = htype_old;
2363 /* If we are testing a mail filter file, use the value of the
2364 Return-Path: header to set up the return_path variable, which is not
2365 otherwise set. However, remove any <> that surround the address
2366 because the variable doesn't have these. */
2368 if (filter_test != FTEST_NONE)
2370 uschar *start = h->text + 12;
2371 uschar *end = start + Ustrlen(start);
2372 while (isspace(*start)) start++;
2373 while (end > start && isspace(end[-1])) end--;
2374 if (*start == '<' && end[-1] == '>')
2379 return_path = string_copyn(start, end - start);
2380 printf("Return-path taken from \"Return-path:\" header line\n");
2384 /* If there is a "Sender:" header and the message is locally originated,
2385 and from an untrusted caller and suppress_local_fixups is not set, or if we
2386 are in submission mode for a remote message, mark it "old" so that it will
2387 not be transmitted with the message, unless active_local_sender_retain is
2388 set. (This can only be true if active_local_from_check is false.) If there
2389 are any resent- headers in the message, apply this rule to Resent-Sender:
2390 instead of Sender:. Messages with multiple resent- header sets cannot be
2391 tidily handled. (For this reason, at least one MUA - Pine - turns old
2392 resent- headers into X-resent- headers when resending, leaving just one
2396 h->type = !f.active_local_sender_retain
2397 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2398 || f.submission_mode
2400 && (!resents_exist || is_resent)
2401 ? htype_old : htype_sender;
2404 /* Remember the Subject: header for logging. There is no Resent-Subject */
2410 /* "To:" gets flagged, and the existence of a recipient header is noted,
2411 whether it's resent- or not. */
2416 to_or_cc_header_exists = TRUE;
2422 /* Extract recipients from the headers if that is required (the -t option).
2423 Note that this is documented as being done *before* any address rewriting takes
2424 place. There are two possibilities:
2426 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2427 recipients already listed are to be REMOVED from the message. Smail 3 works
2428 like this. We need to build a non-recipients tree for that list, because in
2429 subsequent processing this data is held in a tree and that's what the
2430 spool_write_header() function expects. Make sure that non-recipient addresses
2431 are fully qualified and rewritten if necessary.
2433 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2434 those in the command line arguments (and it is rumoured some other MTAs do
2435 this). Therefore, there is an option to make Exim behave this way.
2437 *** Notes on "Resent-" header lines ***
2439 The presence of resent-headers in the message makes -t horribly ambiguous.
2440 Experiments with sendmail showed that it uses recipients for all resent-
2441 headers, totally ignoring the concept of "sets of resent- headers" as described
2442 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2443 with all the addresses in one instance of each header.
2445 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2446 error for -t if there were resent- headers in the message. However, after a
2447 discussion on the mailing list, I've learned that there are MUAs that use
2448 resent- headers with -t, and also that the stuff about sets of resent- headers
2449 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2450 message with -t and resent- header lines makes sure that only *its* resent-
2451 headers are present; previous ones are often renamed as X-resent- for example.
2453 Consequently, Exim has been changed so that, if any resent- header lines are
2454 present, the recipients are taken from all of the appropriate resent- lines,
2455 and not from the ordinary To:, Cc:, etc. */
2460 error_block **bnext = &bad_addresses;
2462 if (extract_addresses_remove_arguments)
2464 while (recipients_count-- > 0)
2466 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2467 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2468 tree_add_nonrecipient(s);
2470 recipients_list = NULL;
2471 recipients_count = recipients_list_max = 0;
2474 /* Now scan the headers */
2476 for (header_line * h = header_list->next; h; h = h->next)
2478 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2479 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2481 uschar *s = Ustrchr(h->text, ':') + 1;
2482 while (isspace(*s)) s++;
2484 f.parse_allow_group = TRUE; /* Allow address group syntax */
2488 uschar *ss = parse_find_address_end(s, FALSE);
2489 uschar *recipient, *errmess, *pp;
2490 int start, end, domain;
2492 /* Check on maximum */
2494 if (recipients_max > 0 && ++rcount > recipients_max)
2495 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2496 US"message rejected: ", error_rc, stdin, NULL);
2497 /* Does not return */
2499 /* Make a copy of the address, and remove any internal newlines. These
2500 may be present as a result of continuations of the header line. The
2501 white space that follows the newline must not be removed - it is part
2504 pp = recipient = store_get(ss - s + 1);
2505 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2510 BOOL b = allow_utf8_domains;
2511 allow_utf8_domains = TRUE;
2513 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2517 if (string_is_utf8(recipient))
2518 message_smtputf8 = TRUE;
2520 allow_utf8_domains = b;
2524 /* Keep a list of all the bad addresses so we can send a single
2525 error message at the end. However, an empty address is not an error;
2526 just ignore it. This can come from an empty group list like
2528 To: Recipients of list:;
2530 If there are no recipients at all, an error will occur later. */
2532 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2534 int len = Ustrlen(s);
2535 error_block *b = store_get(sizeof(error_block));
2536 while (len > 0 && isspace(s[len-1])) len--;
2538 b->text1 = string_printing(string_copyn(s, len));
2544 /* If the recipient is already in the nonrecipients tree, it must
2545 have appeared on the command line with the option extract_addresses_
2546 remove_arguments set. Do not add it to the recipients, and keep a note
2547 that this has happened, in order to give a better error if there are
2548 no recipients left. */
2550 else if (recipient != NULL)
2552 if (tree_search(tree_nonrecipients, recipient) == NULL)
2553 receive_add_recipient(recipient, -1);
2555 extracted_ignored = TRUE;
2558 /* Move on past this address */
2560 s = ss + (*ss? 1:0);
2561 while (isspace(*s)) s++;
2562 } /* Next address */
2564 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2565 f.parse_found_group = FALSE;
2567 /* If this was the bcc: header, mark it "old", which means it
2568 will be kept on the spool, but not transmitted as part of the
2571 if (h->type == htype_bcc) h->type = htype_old;
2572 } /* For appropriate header line */
2573 } /* For each header line */
2577 /* Now build the unique message id. This has changed several times over the
2578 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2579 Retaining all the history in the comment has become too unwieldy - read
2580 previous release sources if you want it.
2582 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2583 The first part is the current time, in seconds. The second part is the current
2584 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2585 can hold a number in the range 0-3843. It used to be a computed sequence
2586 number, but is now the fractional component of the current time in units of
2587 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2588 received, Exim ensures that the timer has ticked at the appropriate level
2589 before proceeding, to avoid duplication if the pid happened to be re-used
2590 within the same time period. It seems likely that most messages will take at
2591 least half a millisecond to be received, so no delay will normally be
2592 necessary. At least for some time...
2594 There is a modification when localhost_number is set. Formerly this was allowed
2595 to be as large as 255. Now it is restricted to the range 0-16, and the final
2596 component of the message id becomes (localhost_number * 200) + fractional time
2597 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2599 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2600 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2601 still allows the tttttt field to hold a large enough number to last for some
2602 more decades, and the final two-digit field can hold numbers up to 1295, which
2603 is enough for milliseconds (instead of 1/2000 of a second).
2605 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2606 pid, so it is probably safe because pids have to be positive. The
2607 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2608 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2610 Note that string_base62() returns its data in a static storage block, so it
2611 must be copied before calling string_base62() again. It always returns exactly
2614 There doesn't seem to be anything in the RFC which requires a message id to
2615 start with a letter, but Smail was changed to ensure this. The external form of
2616 the message id (as supplied by string expansion) therefore starts with an
2617 additional leading 'E'. The spool file names do not include this leading
2618 letter and it is not used internally.
2620 NOTE: If ever the format of message ids is changed, the regular expression for
2621 checking that a string is in this format must be updated in a corresponding
2622 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2623 must also be changed to reflect the correct string length. The queue-sort code
2624 needs to know the layout. Then, of course, other programs that rely on the
2625 message id format will need updating too. */
2627 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2628 message_id[6] = '-';
2629 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2631 /* Deal with the case where the host number is set. The value of the number was
2632 checked when it was read, to ensure it isn't too big. The timing granularity is
2633 left in id_resolution so that an appropriate wait can be done after receiving
2634 the message, if necessary (we hope it won't be). */
2636 if (host_number_string)
2638 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2639 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2640 string_base62((long int)(
2641 host_number * (1000000/id_resolution) +
2642 message_id_tv.tv_usec/id_resolution)) + 4);
2645 /* Host number not set: final field is just the fractional time at an
2646 appropriate resolution. */
2650 id_resolution = BASE_62 == 62 ? 500 : 1000;
2651 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2652 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2655 /* Add the current message id onto the current process info string if
2658 (void)string_format(process_info + process_info_len,
2659 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2661 /* If we are using multiple input directories, set up the one for this message
2662 to be the least significant base-62 digit of the time of arrival. Otherwise
2663 ensure that it is an empty string. */
2665 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2667 /* Now that we have the message-id, if there is no message-id: header, generate
2668 one, but only for local (without suppress_local_fixups) or submission mode
2669 messages. This can be user-configured if required, but we had better flatten
2670 any illegal characters therein. */
2673 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2675 uschar *id_text = US"";
2676 uschar *id_domain = primary_hostname;
2679 /* Permit only letters, digits, dots, and hyphens in the domain */
2681 if (message_id_domain)
2683 uschar *new_id_domain = expand_string(message_id_domain);
2686 if (!f.expand_string_forcedfail)
2687 log_write(0, LOG_MAIN|LOG_PANIC,
2688 "expansion of \"%s\" (message_id_header_domain) "
2689 "failed: %s", message_id_domain, expand_string_message);
2691 else if (*new_id_domain)
2693 id_domain = new_id_domain;
2694 for (uschar * p = id_domain; *p; p++)
2695 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2699 /* Permit all characters except controls and RFC 2822 specials in the
2700 additional text part. */
2702 if (message_id_text)
2704 uschar *new_id_text = expand_string(message_id_text);
2707 if (!f.expand_string_forcedfail)
2708 log_write(0, LOG_MAIN|LOG_PANIC,
2709 "expansion of \"%s\" (message_id_header_text) "
2710 "failed: %s", message_id_text, expand_string_message);
2712 else if (*new_id_text)
2714 id_text = new_id_text;
2715 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2719 /* Add the header line.
2720 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2721 appended, to preserve classical expectations of header ordering. */
2723 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2724 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2725 *id_text == 0 ? "" : ".", id_text, id_domain);
2727 /* Arrange for newly-created Message-Id to be logged */
2731 msgid_header_newly_created = TRUE;
2736 /* If we are to log recipients, keep a copy of the raw ones before any possible
2737 rewriting. Must copy the count, because later ACLs and the local_scan()
2738 function may mess with the real recipients. */
2740 if (LOGGING(received_recipients))
2742 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2743 for (int i = 0; i < recipients_count; i++)
2744 raw_recipients[i] = string_copy(recipients_list[i].address);
2745 raw_recipients_count = recipients_count;
2748 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2749 recipients will get here only if the conditions were right (allow_unqualified_
2750 recipient is TRUE). */
2752 for (int i = 0; i < recipients_count; i++)
2753 recipients_list[i].address =
2754 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2755 global_rewrite_rules, rewrite_existflags);
2757 /* If there is no From: header, generate one for local (without
2758 suppress_local_fixups) or submission_mode messages. If there is no sender
2759 address, but the sender is local or this is a local delivery error, use the
2760 originator login. This shouldn't happen for genuine bounces, but might happen
2761 for autoreplies. The addition of From: must be done *before* checking for the
2762 possible addition of a Sender: header, because untrusted_set_sender allows an
2763 untrusted user to set anything in the envelope (which might then get info
2764 From:) but we still want to ensure a valid Sender: if it is required. */
2767 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2769 uschar *oname = US"";
2771 /* Use the originator_name if this is a locally submitted message and the
2772 caller is not trusted. For trusted callers, use it only if -F was used to
2773 force its value or if we have a non-SMTP message for which -f was not used
2774 to set the sender. */
2776 if (!sender_host_address)
2778 if (!f.trusted_caller || f.sender_name_forced ||
2779 (!smtp_input && !f.sender_address_forced))
2780 oname = originator_name;
2783 /* For non-locally submitted messages, the only time we use the originator
2784 name is when it was forced by the /name= option on control=submission. */
2786 else if (submission_name) oname = submission_name;
2788 /* Envelope sender is empty */
2790 if (!*sender_address)
2792 uschar *fromstart, *fromend;
2794 fromstart = string_sprintf("%sFrom: %s%s",
2795 resent_prefix, oname, *oname ? " <" : "");
2796 fromend = *oname ? US">" : US"";
2798 if (f.sender_local || f.local_error_message)
2799 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2800 local_part_quote(originator_login), qualify_domain_sender,
2803 else if (f.submission_mode && authenticated_id)
2805 if (!submission_domain)
2806 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2807 local_part_quote(authenticated_id), qualify_domain_sender,
2810 else if (!*submission_domain) /* empty => whole address set */
2811 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2815 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2816 local_part_quote(authenticated_id), submission_domain, fromend);
2818 from_header = header_last; /* To get it checked for Sender: */
2822 /* There is a non-null envelope sender. Build the header using the original
2823 sender address, before any rewriting that might have been done while
2828 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2831 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2834 from_header = header_last; /* To get it checked for Sender: */
2839 /* If the sender is local (without suppress_local_fixups), or if we are in
2840 submission mode and there is an authenticated_id, check that an existing From:
2841 is correct, and if not, generate a Sender: header, unless disabled. Any
2842 previously-existing Sender: header was removed above. Note that sender_local,
2843 as well as being TRUE if the caller of exim is not trusted, is also true if a
2844 trusted caller did not supply a -f argument for non-smtp input. To allow
2845 trusted callers to forge From: without supplying -f, we have to test explicitly
2846 here. If the From: header contains more than one address, then the call to
2847 parse_extract_address fails, and a Sender: header is inserted, as required. */
2850 && ( f.active_local_from_check
2851 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2852 || f.submission_mode && authenticated_id
2855 BOOL make_sender = TRUE;
2856 int start, end, domain;
2858 uschar *from_address =
2859 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2860 &start, &end, &domain, FALSE);
2861 uschar *generated_sender_address;
2863 generated_sender_address = f.submission_mode
2864 ? !submission_domain
2865 ? string_sprintf("%s@%s",
2866 local_part_quote(authenticated_id), qualify_domain_sender)
2867 : !*submission_domain /* empty => full address */
2868 ? string_sprintf("%s", authenticated_id)
2869 : string_sprintf("%s@%s",
2870 local_part_quote(authenticated_id), submission_domain)
2871 : string_sprintf("%s@%s",
2872 local_part_quote(originator_login), qualify_domain_sender);
2874 /* Remove permitted prefixes and suffixes from the local part of the From:
2875 address before doing the comparison with the generated sender. */
2880 uschar *at = domain ? from_address + domain - 1 : NULL;
2883 from_address += route_check_prefix(from_address, local_from_prefix);
2884 slen = route_check_suffix(from_address, local_from_suffix);
2887 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2888 from_address += slen;
2892 if ( strcmpic(generated_sender_address, from_address) == 0
2893 || (!domain && strcmpic(from_address, originator_login) == 0))
2894 make_sender = FALSE;
2897 /* We have to cause the Sender header to be rewritten if there are
2898 appropriate rewriting rules. */
2901 if (f.submission_mode && !submission_name)
2902 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2903 generated_sender_address);
2905 header_add(htype_sender, "%sSender: %s <%s>\n",
2907 f.submission_mode ? submission_name : originator_name,
2908 generated_sender_address);
2910 /* Ensure that a non-null envelope sender address corresponds to the
2911 submission mode sender address. */
2913 if (f.submission_mode && *sender_address)
2915 if (!sender_address_unrewritten)
2916 sender_address_unrewritten = sender_address;
2917 sender_address = generated_sender_address;
2918 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2919 log_write(L_address_rewrite, LOG_MAIN,
2920 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2921 sender_address_unrewritten, generated_sender_address);
2925 /* If there are any rewriting rules, apply them to the sender address, unless
2926 it has already been rewritten as part of verification for SMTP input. */
2928 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2930 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2931 global_rewrite_rules, rewrite_existflags);
2932 DEBUG(D_receive|D_rewrite)
2933 debug_printf("rewritten sender = %s\n", sender_address);
2937 /* The headers must be run through rewrite_header(), because it ensures that
2938 addresses are fully qualified, as well as applying any rewriting rules that may
2941 Qualification of header addresses in a message from a remote host happens only
2942 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2943 appropriate. For local messages, qualification always happens, unless -bnq is
2944 used to explicitly suppress it. No rewriting is done for an unqualified address
2945 that is left untouched.
2947 We start at the second header, skipping our own Received:. This rewriting is
2948 documented as happening *after* recipient addresses are taken from the headers
2949 by the -t command line option. An added Sender: gets rewritten here. */
2951 for (header_line * h = header_list->next; h; h = h->next)
2953 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2954 rewrite_existflags, TRUE);
2959 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2960 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2961 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2962 exists, this applies to the set of resent- headers rather than the normal set.
2964 The requirement for a recipient header has been removed in RFC 2822. At this
2965 point in the code, earlier versions of Exim added a To: header for locally
2966 submitted messages, and an empty Bcc: header for others. In the light of the
2967 changes in RFC 2822, this was dropped in November 2003. */
2970 /* If there is no date header, generate one if the message originates locally
2971 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2972 submission mode flag is set. Messages without Date: are not valid, but it seems
2973 to be more confusing if Exim adds one to all remotely-originated messages.
2974 As per Message-Id, we prepend if resending, else append.
2977 if ( !date_header_exists
2978 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2979 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2980 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2982 search_tidyup(); /* Free any cached resources */
2984 /* Show the complete set of headers if debugging. Note that the first one (the
2985 new Received:) has not yet been set. */
2989 debug_printf(">>Headers after rewriting and local additions:\n");
2990 for (header_line * h = header_list->next; h; h = h->next)
2991 debug_printf("%c %s", h->type, h->text);
2995 /* The headers are now complete in store. If we are running in filter
2996 testing mode, that is all this function does. Return TRUE if the message
2997 ended with a dot. */
2999 if (filter_test != FTEST_NONE)
3001 process_info[process_info_len] = 0;
3002 return message_ended == END_DOT;
3005 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3006 think more if it could be handled. Cannot do onward CHUNKING unless
3007 inbound is, but inbound chunking ought to be ok with outbound plain.
3008 Could we do onward CHUNKING given inbound CHUNKING?
3010 if (chunking_state > CHUNKING_OFFERED)
3011 cancel_cutthrough_connection(FALSE, US"chunking active");
3013 /* Cutthrough delivery:
3014 We have to create the Received header now rather than at the end of reception,
3015 so the timestamp behaviour is a change to the normal case.
3016 Having created it, send the headers to the destination. */
3018 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3020 if (received_count > received_headers_max)
3022 cancel_cutthrough_connection(TRUE, US"too many headers");
3023 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3024 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3025 "Too many \"Received\" headers",
3027 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3028 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3029 message_id[0] = 0; /* Indicate no message accepted */
3030 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3031 goto TIDYUP; /* Skip to end of function */
3033 received_header_gen();
3034 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3035 (void) cutthrough_headers_send();
3039 /* Open a new spool file for the data portion of the message. We need
3040 to access it both via a file descriptor and a stream. Try to make the
3041 directory if it isn't there. */
3043 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3044 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3046 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3048 if (errno == ENOENT)
3050 (void) directory_make(spool_directory,
3051 spool_sname(US"input", message_subdir),
3052 INPUT_DIRECTORY_MODE, TRUE);
3053 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3056 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3057 spool_name, strerror(errno));
3060 /* Make sure the file's group is the Exim gid, and double-check the mode
3061 because the group setting doesn't always get set automatically. */
3063 if (fchown(data_fd, exim_uid, exim_gid))
3064 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3065 "Failed setting ownership on spool file %s: %s",
3066 spool_name, strerror(errno));
3067 (void)fchmod(data_fd, SPOOL_MODE);
3069 /* We now have data file open. Build a stream for it and lock it. We lock only
3070 the first line of the file (containing the message ID) because otherwise there
3071 are problems when Exim is run under Cygwin (I'm told). See comments in
3072 spool_in.c, where the same locking is done. */
3074 spool_data_file = fdopen(data_fd, "w+");
3075 lock_data.l_type = F_WRLCK;
3076 lock_data.l_whence = SEEK_SET;
3077 lock_data.l_start = 0;
3078 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3080 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3081 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3082 errno, strerror(errno));
3084 /* We have an open, locked data file. Write the message id to it to make it
3085 self-identifying. Then read the remainder of the input of this message and
3086 write it to the data file. If the variable next != NULL, it contains the first
3087 data line (which was read as a header but then turned out not to have the right
3088 format); write it (remembering that it might contain binary zeros). The result
3089 of fwrite() isn't inspected; instead we call ferror() below. */
3091 fprintf(spool_data_file, "%s-D\n", message_id);
3094 uschar *s = next->text;
3095 int len = next->slen;
3096 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3097 body_linecount++; /* Assumes only 1 line */
3100 /* Note that we might already be at end of file, or the logical end of file
3101 (indicated by '.'), or might have encountered an error while writing the
3102 message id or "next" line. */
3104 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3108 message_ended = chunking_state <= CHUNKING_OFFERED
3109 ? read_message_data_smtp(spool_data_file)
3111 ? read_message_bdat_smtp_wire(spool_data_file)
3112 : read_message_bdat_smtp(spool_data_file);
3113 receive_linecount++; /* The terminating "." line */
3116 message_ended = read_message_data(spool_data_file);
3118 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3119 message_linecount += body_linecount;
3121 switch (message_ended)
3123 /* Handle premature termination of SMTP */
3128 Uunlink(spool_name); /* Lose data file when closed */
3129 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3130 message_id[0] = 0; /* Indicate no message accepted */
3131 smtp_reply = handle_lost_connection(US"");
3133 goto TIDYUP; /* Skip to end of function */
3137 /* Handle message that is too big. Don't use host_or_ident() in the log
3138 message; we want to see the ident value even for non-remote messages. */
3141 Uunlink(spool_name); /* Lose the data file when closed */
3142 cancel_cutthrough_connection(TRUE, US"mail too big");
3143 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3145 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3146 "message too big: read=%d max=%d",
3148 sender_fullhost ? " H=" : "",
3149 sender_fullhost ? sender_fullhost : US"",
3150 sender_ident ? " U=" : "",
3151 sender_ident ? sender_ident : US"",
3153 thismessage_size_limit);
3157 smtp_reply = US"552 Message size exceeds maximum permitted";
3158 message_id[0] = 0; /* Indicate no message accepted */
3159 goto TIDYUP; /* Skip to end of function */
3163 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3164 give_local_error(ERRMESS_TOOBIG,
3165 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3166 US"message rejected: ", error_rc, spool_data_file, header_list);
3167 /* Does not return */
3171 /* Handle bad BDAT protocol sequence */
3174 Uunlink(spool_name); /* Lose the data file when closed */
3175 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3176 smtp_reply = US""; /* Response already sent */
3177 message_id[0] = 0; /* Indicate no message accepted */
3178 goto TIDYUP; /* Skip to end of function */
3182 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3183 example, there may be some expansion in an ACL that uses a timer.) */
3185 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3187 /* The message body has now been read into the data file. Call fflush() to
3188 empty the buffers in C, and then call fsync() to get the data written out onto
3189 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3190 having to do this). If there was an I/O error on either input or output,
3191 attempt to send an error message, and unlink the spool file. For non-SMTP input
3192 we can then give up. Note that for SMTP input we must swallow the remainder of
3193 the input in cases of output errors, since the far end doesn't expect to see
3194 anything until the terminating dot line is sent. */
3196 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3197 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3199 uschar *msg_errno = US strerror(errno);
3200 BOOL input_error = (receive_ferror)() != 0;
3201 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3202 input_error? "Input read" : "Spool write",
3204 sender_fullhost ? sender_fullhost : sender_ident);
3206 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3207 Uunlink(spool_name); /* Lose the data file */
3208 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3213 smtp_reply = US"451 Error while reading input data";
3216 smtp_reply = US"451 Error while writing spool file";
3217 receive_swallow_smtp();
3219 message_id[0] = 0; /* Indicate no message accepted */
3220 goto TIDYUP; /* Skip to end of function */
3225 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3226 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3228 /* Does not return */
3233 /* No I/O errors were encountered while writing the data file. */
3235 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3236 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3239 /* If there were any bad addresses extracted by -t, or there were no recipients
3240 left after -t, send a message to the sender of this message, or write it to
3241 stderr if the error handling option is set that way. Note that there may
3242 legitimately be no recipients for an SMTP message if they have all been removed
3245 We need to rewind the data file in order to read it. In the case of no
3246 recipients or stderr error writing, throw the data file away afterwards, and
3247 exit. (This can't be SMTP, which always ensures there's at least one
3248 syntactically good recipient address.) */
3250 if (extract_recip && (bad_addresses || recipients_count == 0))
3254 if (recipients_count == 0) debug_printf("*** No recipients\n");
3257 debug_printf("*** Bad address(es)\n");
3258 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3259 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3263 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3264 message_id, bad_addresses ? "bad addresses" : "no recipients");
3266 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3268 /* If configured to send errors to the sender, but this fails, force
3269 a failure error code. We use a special one for no recipients so that it
3270 can be detected by the autoreply transport. Otherwise error_rc is set to
3271 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3272 it is EXIT_SUCCESS. */
3274 if (error_handling == ERRORS_SENDER)
3276 if (!moan_to_sender(
3278 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3279 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3280 bad_addresses, header_list, spool_data_file, FALSE
3282 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3287 if (extracted_ignored)
3288 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3290 fprintf(stderr, "exim: no recipients in message\n");
3293 fprintf(stderr, "exim: invalid address%s",
3294 bad_addresses->next ? "es:\n" : ":");
3295 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3296 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3297 bad_addresses->text2);
3301 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3303 Uunlink(spool_name);
3304 (void)fclose(spool_data_file);
3305 exim_exit(error_rc, US"receiving");
3309 /* Data file successfully written. Generate text for the Received: header by
3310 expanding the configured string, and adding a timestamp. By leaving this
3311 operation till now, we ensure that the timestamp is the time that message
3312 reception was completed. However, this is deliberately done before calling the
3313 data ACL and local_scan().
3315 This Received: header may therefore be inspected by the data ACL and by code in
3316 the local_scan() function. When they have run, we update the timestamp to be
3317 the final time of reception.
3319 If there is just one recipient, set up its value in the $received_for variable
3320 for use when we generate the Received: header.
3322 Note: the checking for too many Received: headers is handled by the delivery
3324 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3326 if (!received_header->text) /* Non-cutthrough case */
3328 received_header_gen();
3330 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3332 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3333 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3335 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3336 now, before running the DATA ACL. */
3338 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3341 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3342 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3344 /* If an ACL is specified for checking things at this stage of reception of a
3345 message, run it, unless all the recipients were removed by "discard" in earlier
3346 ACLs. That is the only case in which recipients_count can be zero at this
3347 stage. Set deliver_datafile to point to the data file so that $message_body and
3348 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3351 deliver_datafile = data_fd;
3354 f.enable_dollar_recipients = TRUE;
3356 if (recipients_count == 0)
3357 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3361 /* Handle interactive SMTP messages */
3363 if (smtp_input && !smtp_batched_input)
3366 #ifndef DISABLE_DKIM
3367 if (!f.dkim_disable_verify)
3369 /* Finish verification */
3370 dkim_exim_verify_finish();
3372 /* Check if we must run the DKIM ACL */
3373 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3375 uschar * dkim_verify_signers_expanded =
3376 expand_string(dkim_verify_signers);
3377 gstring * results = NULL;
3381 gstring * seen_items = NULL;
3382 int old_pool = store_pool;
3384 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3386 if (!(ptr = dkim_verify_signers_expanded))
3387 log_write(0, LOG_MAIN|LOG_PANIC,
3388 "expansion of dkim_verify_signers option failed: %s",
3389 expand_string_message);
3391 /* Default to OK when no items are present */
3393 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3395 /* Prevent running ACL for an empty item */
3396 if (!item || !*item) continue;
3398 /* Only run ACL once for each domain or identity,
3399 no matter how often it appears in the expanded list. */
3403 const uschar * seen_items_list = string_from_gstring(seen_items);
3405 BOOL seen_this_item = FALSE;
3407 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3409 if (Ustrcmp(seen_item,item) == 0)
3411 seen_this_item = TRUE;
3418 debug_printf("acl_smtp_dkim: skipping signer %s, "
3419 "already seen\n", item);
3423 seen_items = string_catn(seen_items, US":", 1);
3425 seen_items = string_cat(seen_items, item);
3427 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3431 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3432 "skipping remaining items\n", rc, item);
3433 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3437 dkim_verify_status = string_from_gstring(results);
3438 store_pool = old_pool;
3439 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3442 recipients_count = 0;
3443 blackholed_by = US"DKIM ACL";
3445 blackhole_log_msg = string_sprintf(": %s", log_msg);
3449 Uunlink(spool_name);
3450 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3451 smtp_yield = FALSE; /* No more messages after dropped connection */
3452 smtp_reply = US""; /* Indicate reply already sent */
3453 message_id[0] = 0; /* Indicate no message accepted */
3454 goto TIDYUP; /* Skip to end of function */
3458 dkim_exim_verify_log_all();
3460 #endif /* DISABLE_DKIM */
3462 #ifdef WITH_CONTENT_SCAN
3463 if ( recipients_count > 0
3465 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3468 #endif /* WITH_CONTENT_SCAN */
3470 #ifdef EXPERIMENTAL_DMARC
3471 dmarc_up = dmarc_store_data(from_header);
3472 #endif /* EXPERIMENTAL_DMARC */
3474 #ifndef DISABLE_PRDR
3475 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3478 int all_fail = FAIL;
3480 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3481 /* Loop through recipients, responses must be in same order received */
3482 for (unsigned int c = 0; recipients_count > c; c++)
3484 uschar * addr= recipients_list[c].address;
3485 uschar * msg= US"PRDR R=<%s> %s";
3488 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3489 addr, c+1, recipients_count);
3490 rc = acl_check(ACL_WHERE_PRDR, addr,
3491 acl_smtp_data_prdr, &user_msg, &log_msg);
3493 /* If any recipient rejected content, indicate it in final message */
3495 /* If all recipients rejected, indicate in final message */
3500 case OK: case DISCARD: code = US"250"; break;
3501 case DEFER: code = US"450"; break;
3502 default: code = US"550"; break;
3504 if (user_msg != NULL)
3505 smtp_user_msg(code, user_msg);
3510 case OK: case DISCARD:
3511 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3513 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3515 msg = string_sprintf(CS msg, addr, "refusal"); break;
3517 smtp_user_msg(code, msg);
3519 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3520 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3521 else log_write(0, LOG_MAIN, "%s", CS msg);
3523 if (rc != OK) { receive_remove_recipient(addr); c--; }
3525 /* Set up final message, used if data acl gives OK */
3526 smtp_reply = string_sprintf("%s id=%s message %s",
3527 all_fail == FAIL ? US"550" : US"250",
3530 ? US"rejected for all recipients"
3533 : US"accepted for some recipients");
3534 if (recipients_count == 0)
3536 message_id[0] = 0; /* Indicate no message accepted */
3541 prdr_requested = FALSE;
3542 #endif /* !DISABLE_PRDR */
3544 /* Check the recipients count again, as the MIME ACL might have changed
3547 if (acl_smtp_data != NULL && recipients_count > 0)
3549 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3550 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3553 recipients_count = 0;
3554 blackholed_by = US"DATA ACL";
3556 blackhole_log_msg = string_sprintf(": %s", log_msg);
3557 cancel_cutthrough_connection(TRUE, US"data acl discard");
3561 Uunlink(spool_name);
3562 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3563 #ifdef WITH_CONTENT_SCAN
3566 #ifdef EXPERIMENTAL_DCC
3569 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3570 smtp_yield = FALSE; /* No more messages after dropped connection */
3571 smtp_reply = US""; /* Indicate reply already sent */
3572 message_id[0] = 0; /* Indicate no message accepted */
3573 goto TIDYUP; /* Skip to end of function */
3578 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3579 we cannot take different actions for permanent and temporary rejections. */
3584 #ifdef WITH_CONTENT_SCAN
3585 if ( acl_not_smtp_mime
3586 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3590 #endif /* WITH_CONTENT_SCAN */
3594 uschar *user_msg, *log_msg;
3595 f.authentication_local = TRUE;
3596 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3599 recipients_count = 0;
3600 blackholed_by = US"non-SMTP ACL";
3602 blackhole_log_msg = string_sprintf(": %s", log_msg);
3606 Uunlink(spool_name);
3607 #ifdef WITH_CONTENT_SCAN
3610 #ifdef EXPERIMENTAL_DCC
3613 /* The ACL can specify where rejections are to be logged, possibly
3614 nowhere. The default is main and reject logs. */
3616 if (log_reject_target)
3617 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3618 sender_address, log_msg);
3620 if (!user_msg) user_msg = US"local configuration problem";
3621 if (smtp_batched_input)
3622 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3623 /* Does not return */
3626 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3627 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3628 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3630 /* Does not return */
3633 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3637 /* The applicable ACLs have been run */
3639 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3640 if (f.queue_only_policy) queued_by = US"ACL";
3643 #ifdef WITH_CONTENT_SCAN
3647 #ifdef EXPERIMENTAL_DCC
3652 #ifdef HAVE_LOCAL_SCAN
3653 /* The final check on the message is to run the scan_local() function. The
3654 version supplied with Exim always accepts, but this is a hook for sysadmins to
3655 supply their own checking code. The local_scan() function is run even when all
3656 the recipients have been discarded. */
3658 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3660 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3661 deleted, and the incident gets logged. */
3663 if (sigsetjmp(local_scan_env, 1) == 0)
3665 had_local_scan_crash = 0;
3666 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3667 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3668 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3669 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3671 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3672 local_scan_timeout);
3673 local_scan_data = NULL;
3675 had_local_scan_timeout = 0;
3676 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3677 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3678 rc = local_scan(data_fd, &local_scan_data);
3680 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3682 f.enable_dollar_recipients = FALSE;
3684 store_pool = POOL_MAIN; /* In case changed */
3685 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3688 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3689 os_non_restarting_signal(SIGFPE, SIG_DFL);
3690 os_non_restarting_signal(SIGILL, SIG_DFL);
3691 os_non_restarting_signal(SIGBUS, SIG_DFL);
3695 if (had_local_scan_crash)
3697 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3698 "signal %d - message temporarily rejected (size %d)",
3699 had_local_scan_crash, message_size);
3700 receive_bomb_out(US"local-scan-error", US"local verification problem");
3701 /* Does not return */
3703 if (had_local_scan_timeout)
3705 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3706 "message temporarily rejected (size %d)", message_size);
3707 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3708 /* Does not return */
3712 /* The length check is paranoia against some runaway code, and also because
3713 (for a success return) lines in the spool file are read into big_buffer. */
3715 if (local_scan_data)
3717 int len = Ustrlen(local_scan_data);
3718 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3719 local_scan_data = string_copyn(local_scan_data, len);
3722 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3724 if (!f.deliver_freeze) /* ACL might have already frozen */
3726 f.deliver_freeze = TRUE;
3727 deliver_frozen_at = time(NULL);
3728 frozen_by = US"local_scan()";
3730 rc = LOCAL_SCAN_ACCEPT;
3732 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3734 if (!f.queue_only_policy) /* ACL might have already queued */
3736 f.queue_only_policy = TRUE;
3737 queued_by = US"local_scan()";
3739 rc = LOCAL_SCAN_ACCEPT;
3742 /* Message accepted: remove newlines in local_scan_data because otherwise
3743 the spool file gets corrupted. Ensure that all recipients are qualified. */
3745 if (rc == LOCAL_SCAN_ACCEPT)
3747 if (local_scan_data)
3748 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3749 for (int i = 0; i < recipients_count; i++)
3751 recipient_item *r = recipients_list + i;
3752 r->address = rewrite_address_qualify(r->address, TRUE);
3754 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3756 if (recipients_count == 0 && !blackholed_by)
3757 blackholed_by = US"local_scan";
3760 /* Message rejected: newlines permitted in local_scan_data to generate
3761 multiline SMTP responses. */
3765 uschar *istemp = US"";
3769 errmsg = local_scan_data;
3771 Uunlink(spool_name); /* Cancel this message */
3775 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3776 "rejection given", rc);
3779 case LOCAL_SCAN_REJECT_NOLOGHDR:
3780 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3783 case LOCAL_SCAN_REJECT:
3784 smtp_code = US"550";
3785 if (!errmsg) errmsg = US"Administrative prohibition";
3788 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3789 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3792 case LOCAL_SCAN_TEMPREJECT:
3794 smtp_code = US"451";
3795 if (!errmsg) errmsg = US"Temporary local problem";
3796 istemp = US"temporarily ";
3800 g = string_append(NULL, 2, US"F=",
3801 sender_address[0] == 0 ? US"<>" : sender_address);
3802 g = add_host_info_for_log(g);
3804 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3805 string_from_gstring(g), istemp, string_printing(errmsg));
3809 if (!smtp_batched_input)
3811 smtp_respond(smtp_code, 3, TRUE, errmsg);
3812 message_id[0] = 0; /* Indicate no message accepted */
3813 smtp_reply = US""; /* Indicate reply already sent */
3814 goto TIDYUP; /* Skip to end of function */
3817 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3818 /* Does not return */
3822 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3823 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3824 US"message rejected by local scan code: ", error_rc, spool_data_file,
3826 /* Does not return */
3830 /* Reset signal handlers to ignore signals that previously would have caused
3831 the message to be abandoned. */
3833 signal(SIGTERM, SIG_IGN);
3834 signal(SIGINT, SIG_IGN);
3835 #endif /* HAVE_LOCAL_SCAN */
3838 /* Ensure the first time flag is set in the newly-received message. */
3840 f.deliver_firsttime = TRUE;
3842 #ifdef EXPERIMENTAL_BRIGHTMAIL
3844 { /* rewind data file */
3845 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3846 bmi_verdicts = bmi_process_message(header_list, data_fd);
3850 /* Update the timestamp in our Received: header to account for any time taken by
3851 an ACL or by local_scan(). The new time is the time that all reception
3852 processing is complete. */
3854 timestamp = expand_string(US"${tod_full}");
3855 tslen = Ustrlen(timestamp);
3857 memcpy(received_header->text + received_header->slen - tslen - 1,
3860 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3864 f.deliver_freeze = FALSE;
3865 f.queue_only_policy = FALSE;
3868 /* Keep the data file open until we have written the header file, in order to
3869 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3870 don't write the header file, and we unlink the data file. If writing the header
3871 file fails, we have failed to accept this message. */
3873 if (host_checking || blackholed_by)
3875 Uunlink(spool_name);
3876 msg_size = 0; /* Compute size for log line */
3877 for (header_line * h = header_list; h; h = h->next)
3878 if (h->type != '*') msg_size += h->slen;
3881 /* Write the -H file */
3884 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3886 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3887 Uunlink(spool_name); /* Lose the data file */
3891 smtp_reply = US"451 Error in writing spool file";
3892 message_id[0] = 0; /* Indicate no message accepted */
3897 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3898 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3900 /* Does not return */
3905 /* The message has now been successfully received. */
3907 receive_messagecount++;
3909 /* Add data size to written header size. We do not count the initial file name
3910 that is in the file, but we do add one extra for the notional blank line that
3911 precedes the data. This total differs from message_size in that it include the
3912 added Received: header and any other headers that got created locally. */
3914 if (fflush(spool_data_file))
3916 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3917 log_write(0, LOG_MAIN, "%s\n", errmsg);
3918 Uunlink(spool_name); /* Lose the data file */
3922 smtp_reply = US"451 Error in writing spool file";
3923 message_id[0] = 0; /* Indicate no message accepted */
3928 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3929 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3931 /* Does not return */
3934 fstat(data_fd, &statbuf);
3936 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3938 /* Generate a "message received" log entry. We do this by building up a dynamic
3939 string as required. We log the arrival of a new message while the
3940 file is still locked, just in case the machine is *really* fast, and delivers
3941 it first! Include any message id that is in the message - since the syntax of a
3942 message id is actually an addr-spec, we can use the parse routine to canonicalize
3945 g = string_get(256);
3947 g = string_append(g, 2,
3948 fake_response == FAIL ? US"(= " : US"<= ",
3949 sender_address[0] == 0 ? US"<>" : sender_address);
3950 if (message_reference)
3951 g = string_append(g, 2, US" R=", message_reference);
3953 g = add_host_info_for_log(g);
3956 if (LOGGING(tls_cipher) && tls_in.cipher)
3957 g = string_append(g, 2, US" X=", tls_in.cipher);
3958 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3959 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3960 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3961 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3962 if (LOGGING(tls_sni) && tls_in.sni)
3963 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3966 if (sender_host_authenticated)
3968 g = string_append(g, 2, US" A=", sender_host_authenticated);
3969 if (authenticated_id)
3971 g = string_append(g, 2, US":", authenticated_id);
3972 if (LOGGING(smtp_mailauth) && authenticated_sender)
3973 g = string_append(g, 2, US":", authenticated_sender);
3977 #ifndef DISABLE_PRDR
3979 g = string_catn(g, US" PRDR", 5);
3982 #ifdef SUPPORT_PROXY
3983 if (proxy_session && LOGGING(proxy))
3984 g = string_append(g, 2, US" PRX=", proxy_local_address);
3987 if (chunking_state > CHUNKING_OFFERED)
3988 g = string_catn(g, US" K", 2);
3990 sprintf(CS big_buffer, "%d", msg_size);
3991 g = string_append(g, 2, US" S=", big_buffer);
3993 /* log 8BITMIME mode announced in MAIL_FROM
3997 if (LOGGING(8bitmime))
3999 sprintf(CS big_buffer, "%d", body_8bitmime);
4000 g = string_append(g, 2, US" M8S=", big_buffer);
4003 #ifndef DISABLE_DKIM
4004 if (LOGGING(dkim) && dkim_verify_overall)
4005 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4006 # ifdef EXPERIMENTAL_ARC
4007 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4008 g = string_catn(g, US" ARC", 4);
4012 if (LOGGING(receive_time))
4013 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
4016 g = string_append(g, 2, US" Q=", queue_name);
4018 /* If an addr-spec in a message-id contains a quoted string, it can contain
4019 any characters except " \ and CR and so in particular it can contain NL!
4020 Therefore, make sure we use a printing-characters only version for the log.
4021 Also, allow for domain literals in the message id. */
4023 if ( LOGGING(msg_id) && msgid_header
4024 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4028 BOOL save_allow_domain_literals = allow_domain_literals;
4029 allow_domain_literals = TRUE;
4030 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4031 &errmsg, &start, &end, &domain, FALSE);
4032 allow_domain_literals = save_allow_domain_literals;
4034 g = string_append(g, 2,
4035 msgid_header_newly_created ? US" id*=" : US" id=",
4036 string_printing(old_id));
4039 /* If subject logging is turned on, create suitable printing-character
4040 text. By expanding $h_subject: we make use of the MIME decoding. */
4042 if (LOGGING(subject) && subject_header)
4044 uschar *p = big_buffer;
4045 uschar *ss = expand_string(US"$h_subject:");
4047 /* Backslash-quote any double quotes or backslashes so as to make a
4048 a C-like string, and turn any non-printers into escape sequences. */
4051 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4053 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4058 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4061 /* Terminate the string: string_cat() and string_append() leave room, but do
4062 not put the zero in. */
4064 (void) string_from_gstring(g);
4066 /* Create a message log file if message logs are being used and this message is
4067 not blackholed. Write the reception stuff to it. We used to leave message log
4068 creation until the first delivery, but this has proved confusing for some
4071 if (message_logs && !blackholed_by)
4074 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4076 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4080 (void)directory_make(spool_directory,
4081 spool_sname(US"msglog", message_subdir),
4082 MSGLOG_DIRECTORY_MODE, TRUE);
4083 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4087 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4088 m_name, strerror(errno));
4091 FILE *message_log = fdopen(fd, "a");
4094 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4095 m_name, strerror(errno));
4100 uschar *now = tod_stamp(tod_log);
4101 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4102 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4104 if (f.queue_only_policy) fprintf(message_log,
4105 "%s no immediate delivery: queued%s%s by %s\n", now,
4106 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4108 (void)fclose(message_log);
4113 /* Everything has now been done for a successful message except logging its
4114 arrival, and outputting an SMTP response. While writing to the log, set a flag
4115 to cause a call to receive_bomb_out() if the log cannot be opened. */
4117 f.receive_call_bombout = TRUE;
4119 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4120 connection has gone away. This can only be done if there is no unconsumed input
4121 waiting in the local input buffer. We can test for this by calling
4122 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4123 input to be sent following the final dot, so the presence of following input is
4126 If the connection is still present, but there is no unread input for the
4127 socket, the result of a select() call will be zero. If, however, the connection
4128 has gone away, or if there is pending input, the result of select() will be
4129 non-zero. The two cases can be distinguished by trying to read the next input
4130 character. If we succeed, we can unread it so that it remains in the local
4131 buffer for handling later. If not, the connection has been lost.
4133 Of course, since TCP/IP is asynchronous, there is always a chance that the
4134 connection will vanish between the time of this test and the sending of the
4135 response, but the chance of this happening should be small. */
4137 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4138 !receive_smtp_buffered())
4141 fd_set select_check;
4142 FD_ZERO(&select_check);
4143 FD_SET(fileno(smtp_in), &select_check);
4147 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4149 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4150 if (c != EOF) (receive_ungetc)(c); else
4152 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4153 smtp_reply = US""; /* No attempt to send a response */
4154 smtp_yield = FALSE; /* Nothing more on this connection */
4156 /* Re-use the log line workspace */
4159 g = string_cat(g, US"SMTP connection lost after final dot");
4160 g = add_host_info_for_log(g);
4161 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4163 /* Delete the files for this aborted message. */
4165 Uunlink(spool_name);
4166 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4167 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4174 /* The connection has not gone away; we really are going to take responsibility
4175 for this message. */
4177 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4180 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4181 the sender's dot (below).
4182 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4183 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4184 in which case pass temp-reject back to initiator and dump the files.
4186 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4188 XXX We do not handle queue-only, freezing, or blackholes.
4190 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4192 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4193 /* Logging was done in finaldot() */
4196 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4197 cutthrough_done = ACCEPTED;
4198 break; /* message_id needed for SMTP accept below */
4200 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4201 ... for which, pass back the exact error */
4202 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4203 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4204 break; /* message_id needed for SMTP accept below */
4206 default: /* Unknown response, or error. Treat as temp-reject. */
4207 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4208 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4209 break; /* message_id needed for SMTP accept below */
4211 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4212 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4213 cutthrough_done = PERM_REJ;
4218 #ifndef DISABLE_PRDR
4219 if(!smtp_reply || prdr_requested)
4224 log_write(0, LOG_MAIN |
4225 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4226 (LOGGING(received_sender) ? LOG_SENDER : 0),
4229 /* Log any control actions taken by an ACL or local_scan(). */
4231 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4232 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4233 "no immediate delivery: queued%s%s by %s",
4234 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4237 f.receive_call_bombout = FALSE;
4239 store_reset(g); /* The store for the main log message can be reused */
4241 /* If the message is frozen, and freeze_tell is set, do the telling. */
4243 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4244 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4245 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4246 message_id, frozen_by, sender_address);
4249 /* Either a message has been successfully received and written to the two spool
4250 files, or an error in writing the spool has occurred for an SMTP message, or
4251 an SMTP message has been rejected for policy reasons, or a message was passed on
4252 by cutthrough delivery. (For a non-SMTP message we will have already given up
4253 because there's no point in carrying on!) For non-cutthrough we must now close
4254 (and thereby unlock) the data file. In the successful case, this leaves the
4255 message on the spool, ready for delivery. In the error case, the spool file will
4256 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4259 For cutthrough we hold the data file locked until we have deleted it, otherwise
4260 a queue-runner could grab it in the window.
4262 A fflush() was done earlier in the expectation that any write errors on the
4263 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4264 possible for fclose() to fail - but what to do? What has happened to the lock
4265 if this happens? We can at least log it; if it is observed on some platform
4266 then we can think about properly declaring the message not-received. */
4270 /* In SMTP sessions we may receive several messages in one connection. After
4271 each one, we wait for the clock to tick at the level of message-id granularity.
4272 This is so that the combination of time+pid is unique, even on systems where the
4273 pid can be re-used within our time interval. We can't shorten the interval
4274 without re-designing the message-id. See comments above where the message id is
4275 created. This is Something For The Future.
4276 Do this wait any time we have created a message-id, even if we rejected the
4277 message. This gives unique IDs for logging done by ACLs. */
4279 if (id_resolution != 0)
4281 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
4282 exim_wait_tick(&message_id_tv, id_resolution);
4287 process_info[process_info_len] = 0; /* Remove message id */
4288 if (spool_data_file && cutthrough_done == NOT_TRIED)
4290 if (fclose(spool_data_file)) /* Frees the lock */
4291 log_write(0, LOG_MAIN|LOG_PANIC,
4292 "spoolfile error on close: %s", strerror(errno));
4293 spool_data_file = NULL;
4296 /* Now reset signal handlers to their defaults */
4298 signal(SIGTERM, SIG_DFL);
4299 signal(SIGINT, SIG_DFL);
4301 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4302 value, which defaults TRUE - meaning there may be more incoming messages from
4303 this connection. For non-SMTP callers (where there is only ever one message),
4304 the default is FALSE. */
4310 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4311 is set to the response that should be sent. When it is NULL, we generate
4312 default responses. After an ACL error or local_scan() error, the response has
4313 already been sent, and smtp_reply is an empty string to indicate this. */
4315 if (!smtp_batched_input)
4319 if (fake_response != OK)
4320 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4321 3, TRUE, fake_response_text);
4323 /* An OK response is required; use "message" text if present. */
4327 uschar *code = US"250";
4329 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4330 smtp_respond(code, len, TRUE, user_msg);
4333 /* Default OK response */
4335 else if (chunking_state > CHUNKING_OFFERED)
4337 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4338 chunking_datasize, message_size+message_linecount, message_id);
4339 chunking_state = CHUNKING_OFFERED;
4342 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4346 "\n**** SMTP testing: that is not a real message id!\n\n");
4349 /* smtp_reply is set non-empty */
4351 else if (smtp_reply[0] != 0)
4352 if (fake_response != OK && smtp_reply[0] == '2')
4353 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4354 fake_response_text);
4356 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4358 switch (cutthrough_done)
4361 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4363 /* Delete spool files */
4364 Uunlink(spool_name);
4365 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4366 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4370 if (cutthrough.defer_pass)
4372 Uunlink(spool_name);
4373 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4374 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4379 if (cutthrough_done != NOT_TRIED)
4381 if (spool_data_file)
4383 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4384 spool_data_file = NULL;
4386 message_id[0] = 0; /* Prevent a delivery from starting */
4387 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4388 cutthrough.defer_pass = FALSE;
4392 /* For batched SMTP, generate an error message on failure, and do
4393 nothing on success. The function moan_smtp_batch() does not return -
4394 it exits from the program with a non-zero return code. */
4396 else if (smtp_reply)
4397 moan_smtp_batch(NULL, "%s", smtp_reply);
4401 /* If blackholing, we can immediately log this message's sad fate. The data
4402 file has already been unlinked, and the header file was never written to disk.
4403 We must now indicate that nothing was received, to prevent a delivery from
4408 const uschar *detail =
4409 #ifdef HAVE_LOCAL_SCAN
4410 local_scan_data ? string_printing(local_scan_data) :
4412 string_sprintf("(%s discarded recipients)", blackholed_by);
4413 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4414 log_write(0, LOG_MAIN, "Completed");
4418 /* Reset headers so that logging of rejects for a subsequent message doesn't
4419 include them. It is also important to set header_last = NULL before exiting
4420 from this function, as this prevents certain rewrites that might happen during
4421 subsequent verifying (of another incoming message) from trying to add headers
4422 when they shouldn't. */
4424 header_list = header_last = NULL;
4426 return yield; /* TRUE if more messages (SMTP only) */
4429 /* End of receive.c */